CG470 Equivalent / Substitute – SMD 470V GDT for Telecom and Surge Protection | YINT

YINT Electronics — Gas Discharge Tube (GDT)

Target Keywords: CG470 equivalent, CG470 substitute, CG470 replacement, CG470 alternative, Littelfuse CG470 cross reference, SMD GDT 470V, SMD1812-471

SEMrush Data: "gas discharge tube" — 2,400/mo US · KD 29%

1. Introduction

The SMD1812-471 is a 470V SMD gas discharge tube (GDT) that protects telecom, data transmission, and industrial communication equipment from lightning-induced surges and transient overvoltages. It serves as a CG470 equivalent in a compact 1812 surface-mount package.

The SMD1812-471 delivers 2kA impulse discharge current (8/20µs, 10 hits) and ultra-low capacitance of 0.5pF. These parameters make it ideal for high-speed signal line protection where signal integrity matters. YINT Electronics manufactures this GDT with tight process controls for consistent spark-over voltage and long-term reliability across every production lot.

Gas discharge tubes operate by ionizing the internal gas when a transient voltage exceeds the DC breakdown threshold. The arc then safely shunts surge energy to ground. Once the surge passes, the GDT extinguishes and returns to its high-impedance state. This switching behavior makes GDTs the preferred choice for primary protection in telecom central offices, base stations, and outdoor equipment exposed to lightning. The YINT SMD1812-471 CG470 replacement uses this proven technology in a surface-mount package compatible with high-volume PCB assembly.

2. Product Overview

Gas discharge tubes are the most robust primary protection devices for telecom and data lines. The YINT SMD1812-471 operates at 470V DC breakdown with an impulse spark-over voltage of 300V at 1kV/µs. This fast response protects downstream components while keeping signal distortion to a minimum.

The SMD1812 package measures only 4.5mm × 3.2mm, making it suitable for space-constrained PCB designs in Ethernet interfaces, RJ45 connectors, and xDSL equipment. Each device is 100% electrically tested for DC breakdown and insulation resistance before shipment. The 0.5pF capacitance per device allows deployment on signal lines operating up to 1GHz without measurable signal degradation.

YINT produces the full SMD1812 GDT series from 90V to 600V. This complete voltage coverage lets customers source all SMD GDT needs from one manufacturing partner, simplifying supply chain management and reducing qualification costs. Common voltage variants include 90V for low-voltage telecom, 230V for industrial communication, 350V for Ethernet, 470V for higher-voltage telecom, and 600V for AC power protection. Engineers searching for a CG470 alternative can order SMD1812-471 directly from YINT as a drop-in 470V SMD GDT replacement.

3. Key Features

• DC Breakdown: 470V — Suitable for telecom and industrial signal line protection
• Impulse Spark-over: 300V — 1kV/µs fast-response triggering
• Discharge Current: 2kA — 8/20µs waveform, 10 hits capability
• Capacitance: 0.5pF — Minimal signal attenuation on high-speed lines
• SMD1812 Package — Compact 4.5mm × 3.2mm surface-mount footprint
• Low Insertion Loss — Ideal for GHz frequency signal paths
• RoHS Compliant — Lead-free and environmentally friendly
• Operating Temp: -40°C to +85°C — Suitable for outdoor and industrial environments
• Tape & Reel Packaging — Compatible with automated assembly lines

4. Specifications

5. Cross Reference

The SMD1812-471 is a direct CG470 replacement for designs using Littelfuse, Bourns, or EPCOS 470V GDTs. Engineers searching for a CG470 equivalent or CG470 substitute can confidently choose YINT's SMD1812-471 as a cross-reference option with identical or tighter specifications across the key electrical parameters.

When comparing SMD1812-471 against the Littelfuse CG470 cross reference, the YINT part offers a significantly lower impulse spark-over voltage (300V vs approximately 800V). This means the YINT GDT triggers faster during a surge event, providing better downstream protection for sensitive ICs and interface transformers. The Bourns 2036-47-B and EPCOS B88089X series use the same SMD1812 form factor, making the YINT SMD1812-471 a true drop-in CG470 substitute for existing SMD layouts. No PCB footprint modification is required.

6. Comparison with Similar Models

Engineers frequently compare the SMD1812-471 with the Littelfuse CG470 and nearby voltage variants. The table below shows key differences to help select the right CG470 replacement for each design.

The YINT SMD1812-471 offers the lowest impulse spark-over voltage (300V) among 470V GDT equivalents, providing faster triggering for sensitive telecom interfaces. Its 0.5pF capacitance minimizes signal loss on high-speed data lines up to 1GHz. For designs requiring higher surge current capacity, the Littelfuse CG470 delivers 5kA in an axial leaded package. For compact SMD designs, the SMD1812-471 matches the Bourns 2036-47-B in package size while offering lower impulse spark-over for faster protection response. The CG300 and SMD1812-301 are lower-voltage options for 300V-rated circuits with the same package topology. Each CG470 substitute selection depends on the surge current requirement, package preference, and signal frequency of the target application. The SMD1812-471 provides the best combination of compact SMD packaging, ultra-low capacitance, and fast trigger response for modern telecom and data communication designs where PCB space is at a premium and signal integrity requirements are stringent.

7. Applications

• Telecom and xDSL line primary surge protection per ITU-T K.12 and K.20
• Ethernet and PoE interface protection (RJ45, 10/100/1000BASE-T)
• CCTV and video surveillance coaxial and twisted-pair line protection
• RS-485, RS-232, and CAN bus industrial data line protection
• Antenna and RF signal line lightning surge suppression
• Base station and wireless communication equipment power/signal ports
• CATV and broadband distribution equipment
• Industrial sensor and instrumentation signal inputs
• Building management and HVAC control network interfaces
• Security alarm and access control communication lines
• GPON and fiber-to-the-home ONT/ONU telecom port protection

8. Why Choose YINT

• 19+ years of manufacturing expertise in circuit protection components since 2006
• 40+ patents and certifications covering GDT, TVS, varistor, and fuse production
• 100% electrical testing on every GDT for DC breakdown voltage and insulation resistance
• Full SMD1812 GDT series from 90V to 600V for one-stop sourcing
• Direct CG470 replacement — compatible with Littelfuse, Bourns, and EPCOS GDT cross-reference designs
• Global sales network serving North America, Europe, Asia, and Latin America with responsive support
• Engineering team available for application assistance and cross-reference verification
• Free samples for testing and qualification upon request
• Competitive direct manufacturer pricing with volume discounts available

9. Ordering Information

10. FAQ

Q1: Is YINT SMD1812-471 a direct replacement for Littelfuse CG470?
A: Yes. The SMD1812-471 offers the same 470V DC breakdown with lower impulse spark-over (300V vs 800V) in a compact SMD1812 package. It is a CG470 alternative for SMD designs using the same voltage rating.

Q2: What is the difference between CG470 and SMD1812-471?
A: CG470 has 5kA surge capacity in an axial leaded package. SMD1812-471 provides 2kA in a smaller SMD1812 footprint with lower capacitance (0.5pF) for high-speed signal lines. Both share the same 470V DC breakdown voltage.

Q3: Can SMD1812-471 replace Bourns 2036-47-B?
A: Yes. Both are 470V SMD GDTs in 1812 package. YINT SMD1812-471 provides a CG470 cross-reference with identical package dimensions and tighter impulse spark-over for faster protection.

Q4: What is the impulse discharge current rating?
A: 2kA for 8/20µs waveform, 10 hits. This covers most telecom and industrial surge protection requirements per IEC 61000-4-5 and ITU-T K.12 standards.

Q5: What applications use 470V GDTs?
A: 470V GDTs protect telecom lines, Ethernet ports, CCTV cameras, RS-485 buses, and RF antenna inputs against lightning surges and AC power cross events. They are common in outdoor telecom cabinets and base stations.

Q6: Does YINT provide free samples for testing?
A: Yes. Contact YINT with your project details for free sample requests and cross-reference qualification support. We help verify the CG470 substitute fit for your specific PCB design.

11. Conclusion

YINT Electronics' SMD1812-471 is a reliable CG470 equivalent for SMD GDT designs. It delivers 470V DC breakdown, 2kA surge current, and 0.5pF capacitance in a compact 1812 package for telecom, industrial, and data communication surge protection. Its low impulse spark-over voltage provides faster triggering than standard CG470 alternatives, improving downstream protection in sensitive applications.

Contact YINT Electronics at global@yint.com.cn for datasheets, samples, or pricing. Our engineering team is ready to assist with CG470 cross-references and application support.