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YINT Electronics — Transient Voltage Suppression (TVS) Diode
Target Keywords: SMF5.0A alternative, SMF5.0A equivalent, SMF5.0A replacement, SMF5.0A substitute, SMF5.0A cross reference, SMF5.0A TVS diode, SMF5.0A SOD123FL
The SMF5.0A is a 200W unidirectional transient voltage suppression (TVS) diode engineered to protect sensitive electronic circuits from electrostatic discharge (ESD), lightning-induced surges, and fast switching transients. With a precise stand-off voltage of 5.00V and a tightly controlled breakdown voltage range of 6.40V to 7.00V, the SMF5.0A is purpose-built for 5V and 3.3V DC rail protection in space-constrained portable electronics, IoT devices, consumer gadgets, and communication interface circuits.
Housed in the ultra-compact SOD-123FL surface mount package, the SMF5.0A offers dramatic space savings of up to 40% compared to traditional SMA (DO-214AC) or SMB (DO-214AA) packaged TVS diodes, while still delivering a reliable 200W peak pulse power rating (10/1000µs waveform). Its sub-nanosecond response time — typically less than 1 nanosecond — ensures that transient overvoltages are clamped to safe levels before they can reach and damage downstream sensitive ICs, microcontrollers, memory modules, and communication controllers.
The SMF5.0A is a JEDEC-registered industry standard part number, cross-compatible across all major TVS diode manufacturers including Littelfuse, Vishay, ON Semiconductor, Diodes Incorporated, STMicroelectronics, Bourns, and Taiwan Semiconductor. YINT Electronics manufactures the SMF5.0A as a high-performance, fully compatible replacement in the industry-standard SOD-123FL package, offering engineers a trustworthy SMF5.0A alternative or SMF5.0A equivalent that requires zero PCB redesign.
The SMF series is a widely adopted family of 200W surface-mount TVS diodes specifically engineered for compact and portable electronic designs where PCB real estate is at a premium. Covering working voltages from 5V all the way up to 170V in the ultra-thin SOD-123FL package, the SMF series delivers consistent 200W of peak pulse power dissipation (10/1000µs waveform) with a maximum component height of just 1.1mm. This low-profile characteristic makes the SMF series particularly attractive for slim, space-constrained products such as smartphones, tablets, portable medical devices, and wearable electronics.
The SMF5.0A represents the lowest voltage variant in the SMF series, carefully engineered for protecting 5V DC power rails and 3.3V logic supply lines. Its low stand-off voltage of 5.00V allows the diode to sit silently across a 5V supply line without conducting under normal bias conditions — the leakage current is a maximum of just 400µA at room temperature. Yet when a transient overvoltage event occurs, the SMF5.0A responds in less than 1 nanosecond, avalanching to clamp the transient to a safe voltage level. The tight breakdown tolerance of 6.40V to 7.00V (±4.5% typical) ensures consistent and predictable clamping performance across different production lots, giving design engineers confidence in their protection margin calculations without needing to over-specify guard bands.
Key application areas for the SMF5.0A include USB 2.0/3.0 VBUS (5V power line) protection, portable battery-powered device charging input protection, HDMI and DisplayPort interface 5V power pin ESD clamping, and general-purpose 5V rail surge suppression in consumer and industrial electronics. The SOD-123FL package footprint (2.9mm × 1.9mm body) occupies approximately 40% less PCB area than an equivalent SMA (DO-214AC) TVS diode while being compatible with standard reflow soldering profiles per J-STD-020, enabling higher component density in compact, multi-layer PCB designs.
YINT Electronics manufactures the complete SMF series including the SMF5.0A, SMF6.0A, SMF6.5A, SMF10A, SMF12A, SMF15A, SMF20A, SMF24A, SMF30A, SMF36A, SMF48A, SMF58A, SMF60A, SMF64A, SMF70A, SMF78A, SMF85A, SMF90A, SMF100A, SMF110A, SMF120A, SMF130A, SMF150A, SMF160A, SMF170A, and beyond. This broad and complete voltage coverage from a single manufacturing partner simplifies supply chain management, reduces component qualification time, and enables volume pricing advantages for OEM customers. Every YINT SMF5.0A device is manufactured using advanced silicon avalanche technology with stringent process controls, ensuring consistent breakdown voltage, surge current capability, and reliability across every production lot.
The SMF5.0A is rated for 200W peak pulse power dissipation at 25°C ambient temperature with a 10/1000µs exponential waveform (per JEDEC standards). However, this peak power rating must be linearly derated at elevated ambient temperatures to ensure reliable long-term operation. At 100°C ambient, the derating factor is approximately 80% of the 25°C rating, reducing the effective peak pulse power handling to 160W. At 125°C ambient, the derating factor drops to approximately 50% (100W effective). At the maximum rated junction temperature of 150°C, the available peak pulse power derates to near zero. Design engineers must account for this temperature derating behavior — characteristic of all silicon avalanche TVS diodes — when calculating protection margins for equipment operating in elevated temperature environments such as enclosed power supplies, outdoor telecom cabinets, or industrial control panels.
For short-duration surge waveforms such as the 8/20µs waveform commonly specified for lightning surge testing per IEC 61000-4-5, the effective peak pulse power capability of the SMF5.0A can exceed 400W due to the significantly reduced energy content per pulse compared to the standard 10/1000µs rating waveform. The SMF5.0A can also withstand 1000 repetitive surges at 50% of the rated peak pulse power without measurable performance degradation, making it suitable for applications where repeated transient events are expected — such as motor drive circuits or industrial switching power supplies.
The SMF5.0A's SOD-123FL package exhibits a thermal resistance (junction-to-ambient) of approximately 200°C/W on standard FR-4 PCB with minimal copper pad area. Using larger copper landing pads or thermal vias can reduce thermal resistance by 15-25%, improving surge current handling at elevated temperatures. Lead-free reflow soldering per J-STD-020 should be used with a peak reflow temperature of 260°C for a maximum of 10 seconds. The package body can withstand continuous operation up to 150°C junction temperature, ensuring reliable operation even in thermally challenging environments such as enclosed IoT sensor nodes or outdoor telecom pole-mounted equipment.
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Peak Pulse Power (10/1000µs) | PPK | 200 | W |
| Stand-off Voltage (Max) | Vrwm | 5.00 | V |
| Breakdown Voltage (Min) @ iT | Vbr[min] | 6.40 | V |
| Breakdown Voltage (Max) @ iT | Vbr[max] | 7.00 | V |
| Test Current for Vbr | iT | 10 | mA |
| Peak Pulse Current (10/1000µs) | Ipp | 21.70 | A |
| Max Clamping Voltage @ Ipp | Vc | 9.20 | V |
| Reverse Leakage Current @ Vrwm (25°C) | IR | 400 | µA |
| Reverse Leakage Current @ Vrwm (85°C) | IR | 2000 | µA |
| Operating Junction Temperature | Tj | -55 ~ +150 | °C |
| Storage Temperature Range | Tstg | -55 ~ +150 | °C |
| Polarity | — | Unidirectional | — |
| Package Type | — | SOD-123FL | — |
| Mounting Type | — | Surface Mount (SMD) | — |
| Solder Reflow Peak Temperature | — | 260 | °C |
The SMF5.0A is a JEDEC-registered industry standard part number used by virtually all major TVS diode manufacturers across the global electronics market. YINT Electronics' SMF5.0A is a direct drop-in replacement that offers identical or tighter electrical specifications, ensuring full compatibility without any PCB layout modification or circuit redesign. When searching for an SMF5.0A equivalent, engineers can confidently select the YINT SMF5.0A as a universal cross-reference option that performs identically to the original brand name part.
| Manufacturer | Original Part Number | YINT Replacement Part | Compatibility Notes |
|---|---|---|---|
| YINT Electronics | SMF5.0A | SMF5.0A | Direct primary source |
| Littelfuse | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Vishay (General Semiconductor) | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| ON Semiconductor | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Diodes Incorporated | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| STMicroelectronics | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Bourns | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Micro Commercial Components (MCC) | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Good-Ark Electronics (Taiwan) | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Taiwan Semiconductor (TSC) | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Brightking | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
| Wayon | SMF5.0A | SMF5.0A | Drop-in, electrically identical |
When selecting a TVS diode for 5V DC rail protection, design engineers typically compare the SMF5.0A with nearby voltage variants, alternative package options, and different power ratings to find the optimal balance of protection level, PCB footprint, and cost. The comprehensive comparison table below provides a side-by-side technical reference to aid in selecting the best SMF5.0A equivalent for specific design requirements.
| Model Number | Vrwm (V) | Vbr Range (V) | PPK (W) | Ipp (A) | Vc (V) | Package | Key Application Difference |
|---|---|---|---|---|---|---|---|
| SMF5.0A | 5.00 | 6.40-7.00 | 200 | 21.70 | 9.20 | SOD123FL | Baseline — compact SMD, 5V protection |
| SMF6.0A | 6.00 | 6.67-7.37 | 200 | 19.40 | 10.30 | SOD123FL | Higher stand-off, same compact package |
| SMF10A | 10.00 | 11.10-12.30 | 200 | 12.10 | 16.50 | SOD123FL | For 10V/12V rail protection |
| SMF24A | 24.00 | 26.70-29.50 | 200 | 5.10 | 38.90 | SOD123FL | For 24V industrial rail protection |
| P6KE6.8A | 5.80 | 6.45-7.14 | 600 | 58.10 | 10.50 | DO-15 | 3× higher power, through-hole package |
| SMAJ5.0A | 5.00 | 6.40-7.00 | 400 | 43.50 | 9.20 | SMA (DO-214AC) | Medium power, larger SMD package |
| SMBJ5.0A | 5.00 | 6.40-7.00 | 600 | 65.20 | 9.20 | SMB (DO-214AA) | Highest power SMD in same voltage |
| ESD5V0D3 | 5.00 | 6.00-7.00 | 100 | 5.00 | 12.00 | SOD323 | Lower power, ultra-low capacitance for high-speed data lines |
| ESD24VD3 | 24.00 | 26.70 typ | 350 | 8.00 | 48.00 | SOD323 | 24V ESD protection for signal lines |
In USB 2.0 and USB 3.0 port designs, the SMF5.0A is most commonly deployed on the VBUS (5V power) line to protect the host controller and power management IC from ESD events that occur during hot-plugging, cable handling, and connector mating/unmating. The TVS diode is connected in reverse-bias directly between the VBUS pin and the ground plane, as close to the USB connector as physically possible — ideally within 5mm trace length to minimize parasitic inductance that can degrade clamping performance during fast ESD events (rise times as fast as 0.7ns to 1ns per IEC 61000-4-2).
Under normal USB 2.0/3.0 operating conditions, the SMF5.0A's 5.00V stand-off voltage is well above the nominal 5.0V VBUS supply (typically 4.75V to 5.25V per USB specification), so the diode presents a high-impedance open circuit with leakage current of only 400µA maximum. When an ESD event of up to ±15kV air discharge or ±8kV contact discharge (IEC 61000-4-2 level 4) strikes the VBUS pin, the SMF5.0A avalanches within sub-nanosecond response time, clamping the transient to a maximum of 9.20V and safely diverting the surge energy to ground. For comprehensive USB port protection, the SMF5.0A on VBUS should be complemented with ultra-low capacitance (<1pF) ESD protection diodes on the D+ and D- data lines to avoid signal integrity degradation at high-speed data rates (480 Mbps for USB 2.0, 5 Gbps for USB 3.0).
The SMF5.0A's 200W peak pulse power rating provides adequate energy handling margin for USB VBUS protection, where the maximum surge energy is inherently limited by the upstream USB host's overcurrent protection circuitry (typically 500mA to 900mA per USB 2.0/3.0 specifications). The SOD-123FL package fits easily within the tight PCB clearances of USB Type-A, Type-B, Micro-B, and Type-C connector footprints, making the SMF5.0A a practical and cost-effective choice for compact multimedia and computing device interface protection.
In battery-powered portable devices such as wireless IoT sensors, wearable fitness trackers, portable medical monitors, Bluetooth earphones, and handheld instrumentation, the SMF5.0A protects the external charging input (5V USB, barrel jack, or wireless charging receiver output) from ESD events and surge transients that can couple through the charging cable during connection and disconnection. The TVS diode is placed across the charging input VBUS line and ground, immediately after the input connector and any upstream overcurrent protection fuse or PTC resettable device.
One of the critical advantages of the SMF5.0A for battery-powered designs is its low reverse leakage current of 400µA maximum at rated Vrwm. In real-world operation at typical battery charging voltages (4.2V to 5.0V), the actual leakage current is significantly lower — typically 50µA to 150µA — which minimizes parasitic battery drain during the long standby periods between charging cycles. This is particularly important for IoT sensor nodes that may operate for months or years on a single battery charge and cannot afford milliwatt-level power losses from protection circuitry.
For dual-stage protection schemes in premium portable designs, an ESD24VD3 or similar ESD protection diode can be employed on secondary high-speed signal and data communication lines — such as I2C, SPI, UART, or one-wire interfaces — while the SMF5.0A handles the bulk power rail surge protection. This tiered protection approach provides comprehensive transient immunity across both power and signal domains without compromising signal integrity on high-speed data interfaces.
IoT sensor nodes deployed in industrial facilities, outdoor agricultural environments, smart city infrastructure, and building automation systems are exposed to a wide range of ESD and surge threats. These threats originate from environmental electrostatic coupling (human touch during maintenance), conducted transients on long sensor cabling, and induced surges from nearby lightning strikes on building infrastructure. An SMF5.0A installed on the 5V sensor node power bus provides robust front-end transient protection against these diverse threats.
In a typical IoT sensor node design, the SMF5.0A is placed at the power input stage — either after a low-dropout regulator (LDO) or directly across the battery/energy harvesting output — to clamp any overvoltage transient before it reaches the microcontroller (MCU), wireless transceiver (BLE, LoRa, Zigbee, Wi-Fi), and sensor analog front-end. For sensor nodes with external communication interfaces such as RS-485, CAN bus, or 4-20mA current loops, the SMF5.0A can be supplemented with the ESD24VD3 on the communication lines to provide comprehensive surge protection across both power and signal domains. The SOD-123FL package's low 1.1mm profile is particularly advantageous for compact IP67-rated sensor enclosures where PCB height is strictly limited.
In multimedia interface designs for set-top boxes, gaming consoles, laptops, monitors, and projectors, the SMF5.0A is commonly used to protect the 5V power pin (pin 18 on HDMI connectors, pin 20 on DisplayPort connectors) from ESD events that occur during cable insertion and removal by end users. The 5V power pin in these interfaces supplies the sink device's EDID (Extended Display Identification Data) EEPROM and interface logic, and a transient overvoltage on this pin can corrupt EDID data, damage the EEPROM, or cause intermittent display detection failures.
The SMF5.0A's sub-nanosecond response time ensures that ESD transients are clamped before they propagate through the power distribution network to the sensitive interface controller IC. For the high-speed data lines in HDMI (TMDS differential pairs running at up to 6 Gbps per lane for HDMI 2.0) and DisplayPort (main link differential pairs at up to 8.1 Gbps per lane for DP 1.4), the SMF5.0A should not be used directly due to its relatively high capacitance (~80pF typical for a 200W TVS). Instead, specialized ultra-low capacitance ESD protection diodes (<0.5pF) should be specified for the high-speed differential data lanes to maintain signal integrity, while the SMF5.0A handles the 5V power pin protection where capacitance is not a concern.
| Part Number | Package | Polarity | Packaging Format | Standard Quantity |
|---|---|---|---|---|
| SMF5.0A | SOD-123FL | Unidirectional | Tape & Reel (8mm embossed carrier) | 3,000 pcs/reel |
| SMF5.0A (Engineering Samples) | SOD-123FL | Unidirectional | Cut Tape / Loose | On request — minimum 100 pcs |
| Dimension | Symbol | Min (mm) | Max (mm) |
|---|---|---|---|
| Body Length | L | 2.70 | 3.10 |
| Body Width | W | 1.70 | 2.10 |
| Body Height (Thickness) | H | 0.90 | 1.10 |
| Terminal Width (Land Pattern) | Tw | 0.80 | 1.20 |
| Terminal Length | Tl | 0.40 | 0.85 |
| Unit Weight | — | 0.043g (typical) | |
Q1: Is the YINT SMF5.0A a direct drop-in replacement for Littelfuse, Vishay, or ON Semiconductor SMF5.0A?
A: Yes, absolutely. The YINT SMF5.0A offers identical electrical parameters (5.00V Vrwm, 6.40-7.00V breakdown range, 200W peak pulse power) and uses the exact same industry-standard SOD-123FL package dimensions. It is a 100% pin-to-pin compatible drop-in replacement for SMF5.0A diodes from all major manufacturers — no PCB layout changes, BOM updates, or requalification testing are required.
Q2: What is the difference between SMF5.0A and SMAJ5.0A?
A: The two parts differ in both package and power rating. The SMF5.0A uses a SOD-123FL package (2.9mm × 1.9mm) with a 200W peak pulse power rating, while the SMAJ5.0A uses a larger SMA / DO-214AC package (4.6mm × 2.8mm) with a 400W rating. The SMF5.0A saves approximately 40% PCB footprint area, making it better suited for space-constrained portable designs. The SMAJ5.0A offers double the surge power handling but requires more board space.
Q3: What is the maximum clamping voltage of SMF5.0A under different surge conditions?
A: The maximum clamping voltage is 9.20V at a peak pulse current of 21.70A under the standard 10/1000µs test waveform. For lower surge currents — such as typical ESD events per IEC 61000-4-2 where the peak current is approximately 30A but with sub-microsecond duration — the actual clamping voltage will be significantly lower, typically in the range of 7.0V to 8.5V depending on the specific ESD waveform and current level.
Q4: Can the SMF5.0A be used for 3.3V logic rail protection?
A: Yes, the SMF5.0A is well-suited for 3.3V rail protection. With a Vrwm of 5.00V, the diode will not conduct under normal 3.3V operating conditions (since 3.3V is well below the 5.00V stand-off threshold). When a transient exceeds the 6.40V minimum breakdown voltage, the SMF5.0A clamps the overvoltage to protect the downstream 3.3V-rated components. This provides ample protection margin for 3.3V logic and memory circuits.
Q5: What is the peak pulse power derating characteristic at elevated temperature?
A: The SMF5.0A must be linearly derated above 25°C ambient. At 75°C, the effective power rating is approximately 90% (180W); at 100°C, approximately 80% (160W); at 125°C, approximately 50% (100W). At 150°C junction temperature, the available peak pulse power decreases to near zero. Design engineers operating in elevated temperature environments should apply appropriate derating factors based on the expected worst-case ambient temperature.
Q6: What is the response time of SMF5.0A?
A: The SMF5.0A responds to overvoltage transients in less than 1 nanosecond (typically 0.5ns to 0.8ns). This sub-nanosecond response provides instantaneous protection against ESD events per IEC 61000-4-2 (which have rise times as fast as 0.7ns to 1ns) and electrical fast transients (EFT) per IEC 61000-4-4 (5ns rise time). This speed ensures that sensitive CMOS ICs are protected from even the fastest transient events.
Q7: How does SMF5.0A compare with SMF6.0A — which one should I choose?
A: The key difference is the stand-off voltage. The SMF5.0A has Vrwm of 5.00V and breakdown range of 6.40-7.00V, optimized for 5V DC rails. The SMF6.0A has Vrwm of 6.00V and Vbr of 6.67-7.37V, designed for 6V-tolerant circuits. If your circuit normally operates at 5.0V nominal with ±5% tolerance (4.75V to 5.25V), the SMF5.0A is the correct choice. If the nominal rail voltage exceeds 5.25V, consider the SMF6.0A or next higher voltage variant.
Q8: What are the storage and operating temperature ranges?
A: The storage temperature range is -55°C to +150°C, matching the operating junction temperature range of -55°C to +150°C. This wide temperature range is suitable for industrial automation, outdoor telecom, and automotive passenger compartment applications.
Q9: Does YINT provide free SMF5.0A samples for engineering testing and qualification?
A: Yes, sample support is available for qualified engineering projects. Contact YINT Electronics at global@yint.com.cn with your application details, target quantity, and delivery timeline. Our team typically processes sample requests within 3-5 business days.
Q10: Is the SMF5.0A qualified to AEC-Q101 automotive reliability standard?
A: The standard commercial-grade SMF5.0A is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 certification (typically under IATF 16949 quality management systems), please contact YINT to discuss recommended automotive-grade TVS alternatives that meet your specific reliability requirements.
Q11: What is the recommended PCB layout land pattern for the SOD-123FL package?
A: The recommended PCB land pattern dimensions are: individual pad size 2.5mm × 1.4mm per terminal, pad-to-pad spacing of 1.0mm between the inner edges, and a total landing zone width of approximately 4.0mm. Standard lead-free reflow soldering profile per J-STD-020 with peak temperature of 260°C for 10 seconds maximum is recommended for reliable solder joint formation.
Q12: Can SMF5.0A be used in battery charging circuits for Li-Ion / Li-Po batteries?
A: Yes. The SMF5.0A is commonly deployed on the charging input line (5V USB or AC adapter output) of Li-Ion and Li-Po battery-powered devices. Its low reverse leakage characteristic (typically 50-150µA at actual battery voltage) helps preserve battery charge during long standby periods. The SMF5.0A protects the charging IC and battery management circuitry from ESD events during charger connection and disconnection.
Q13: What is the junction capacitance of SMF5.0A, and does it affect high-speed signals?
A: The SMF5.0A has a typical junction capacitance of approximately 80pF at zero bias. This capacitance is acceptable for DC power rail protection but is too high for direct use on high-speed data lines (USB 2.0/3.0 data pairs, HDMI TMDS, Ethernet). For high-speed signal line protection, use ultra-low capacitance (<1pF) dedicated ESD protection diodes such as the ESD24VD3 series.
Q14: What is the peak pulse current derating for repetitive surges?
A: The SMF5.0A can withstand 1000 repetitive surges at 50% of rated peak pulse power without degradation. For applications with frequent transient events (motor drives, relay switching), the designer should derate to 50% of the single-pulse rating to ensure long-term reliability.
Q15: How should I select between SMF5.0A and P6KE6.8A for my design?
A: Choose the SMF5.0A (SOD-123FL, 200W) for compact surface-mount designs where PCB space is limited and the 200W surge rating is sufficient. Choose the P6KE6.8A (DO-15 through-hole, 600W) when higher surge current handling (58.10A vs 21.70A) is required and through-hole assembly is acceptable, or for designs needing 3× higher peak pulse power margin.
Q16: Where can I download the complete SMF5.0A datasheet with derating curves?
A: For the full datasheet including power derating curves, clamping voltage vs. peak pulse current charts, thermal impedance graphs, and application notes, please contact YINT Electronics at global@yint.com.cn — our technical support team will provide the complete documentation package.
YINT Electronics' SMF5.0A TVS diode offers a reliable, high-performance, and cost-optimized solution for 5V and 3.3V DC rail transient protection in space-constrained electronic designs. In its ultra-compact SOD-123FL surface-mount package, the SMF5.0A delivers 200W peak pulse power, a tightly controlled breakdown voltage range of 6.40V to 7.00V, and a low clamping voltage of just 9.20V at peak pulse current — performance characteristics that design engineers around the world trust for protecting sensitive electronics from ESD, lightning-induced surges, and switching transients.
Whether you need a direct SMF5.0A replacement for an existing mass-production design, an SMF5.0A equivalent from a vertically integrated manufacturer with 19+ years of experience, or expert technical guidance on selecting the optimal TVS diode for your specific application requirements, YINT Electronics is ready to support your project from concept through production. With a complete SMF series product line, responsive application engineering support, and factory-direct pricing, YINT is your trusted long-term partner for circuit protection components.
For datasheets, free samples, volume pricing, or technical design-in assistance, please contact YINT Electronics at global@yint.com.cn. Our dedicated engineering team is available to assist with cross-reference verification, application circuit design review, and production qualification support.
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