20D471K Alternative / Equivalent / Replacement

YINT Electronics — 20mm Metal Oxide Varistor, 470V

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1. Introduction

The 20D471K is a 20mm disc metal oxide varistor (MOV) with a varistor voltage of 470V. It is the highest energy-absorbing variant in the 470V varistor family, delivering 8000A peak surge current for heavy-duty overvoltage protection. The rated AC voltage is 300V and DC voltage is 385V.

The 20D471K follows the industry-standard 20D varistor series used by Littelfuse, Epcos (TDK), Panasonic, Meritek, Joyin, and other manufacturers. YINT Electronics manufactures this model as a fully compatible replacement with identical electrical specifications. The device responds in under 25 nanoseconds and delivers the highest surge current rating in the 471K varistor family.

YINT manufactures the 20D471K using high-purity zinc oxide ceramic formulations with automated disc sorting and surge current sampling on every production batch. This manufacturing discipline ensures each 20D471K meets its 470V varistor voltage and 8000A surge current rating over the full -40C to +85C operating range. YINT 19 years of varistor manufacturing experience delivers maximum protection for heavy-duty applications.

Engineers searching for a 20D471K replacement or 20D471K alternative can specify the YINT 20D471K as a direct drop-in equivalent. It offers maximum surge protection for AC mains in large industrial equipment, UPS systems, and power distribution applications where smaller discs cannot handle the transient energy.

2. Product Overview

The 20D series is the largest standard disc varistor size for through-hole mounting, offering the highest surge current and energy absorption capabilities. It covers varistor voltages from 18V to 1800V in a 20mm disc package. Each part delivers 8000A peak surge current for the most demanding overvoltage protection applications.

The 20D471K is a 470V rated variant for protecting 300V AC or 385V DC circuits. Its large 20mm disc diameter provides maximum energy absorption among radial leaded varistors at this voltage rating. The 20D471K can absorb over 3 times the energy of the 10D471K, making it ideal for applications exposed to frequent or high-energy lightning and switching transients.

YINT produces the full 20D series from 18V through 1800V. This complete voltage coverage lets customers source all 20mm disc varistor needs from one manufacturing partner. The 20D471K uses high-quality zinc oxide ceramic elements with tight process controls for consistent varistor voltage and maximum energy absorption across every production lot.

Every YINT 20D471K varistor undergoes 100% voltage classification and surge current sampling per IEC 61051-1 standards. This guarantees consistent 8000A peak surge current and 260J energy absorption across all production batches. YINT's robust manufacturing process ensures maximum protection for heavy-duty industrial and power distribution applications.

3. Key Features

• Disc Diameter: 20mm — Largest standard radial disc for maximum surge handling
• Varistor Voltage: 470V — Tight tolerance of ±10%
• AC Voltage Rating: 300V — Suitable for 220-240V AC mains protection
• DC Voltage Rating: 385V — For DC rail overvoltage clamping
• Peak Surge Current: 8000A — 8/20µs waveform, single pulse
• Nominal Surge Current: 4000A — 8/20µs waveform, rated
• Max Energy Absorption: 260J — 2ms waveform typical
• Response Time: < 25ns — Fast clamping for transient events
• Operating Temperature: -40°C to +85°C — Wide industrial range
• RoHS Compliant — Lead-free and environmentally friendly

4. Specifications

5. Cross Reference

The 20D471K is an industry-standard varistor produced by major manufacturers worldwide. YINT's 20D471K is a direct drop-in replacement with identical or tighter electrical specifications. Engineers searching for a 20D471K equivalent can confidently choose YINT as a universal cross-reference option.

6. Comparison with Similar Models

Engineers often compare the 20D471K with smaller disc sizes at the same voltage rating. The table below shows key differences to help select the right 20D471K alternative for each design.

The 20D471K delivers the highest surge current and energy absorption among standard radial lead varistors at 470V. It handles 3.2x the surge current of the 10D471K and 1.3x that of the 14D471K. Choose the 20D471K when your application demands maximum transient protection for 300V AC mains and the larger board footprint is acceptable for the increased protection level.

YINT stocks the 20D471K in full production quantities with short lead times. Volume pricing and free samples are available for evaluation. Contact YINT for datasheets and cross-reference verification.

7. Applications

• Large industrial power supply and motor drive AC mains protection
• UPS and backup power system input surge clamping
• Elevator and escalator main power input protection
• HVAC chiller and large compressor motor protection
• Solar inverter and wind turbine AC side surge protection
• Data center and telecom central office power distribution
• Industrial welding equipment AC power input
• Marine and offshore equipment power system protection
• Oil and gas pumping station electrical protection
• Railway signaling and traction power system protection
• Water treatment plant and pumping station main power
• Factory automation line and robotic system power protection
• Large generator and backup power system AC output protection
• Mining and mineral processing equipment power input clamping
• Large data center UPS system AC input surge protection

8. Why Choose YINT

• 19+ years of manufacturing expertise in circuit protection since 2006
• 40+ patents and certifications with robust quality control
• Global sales network serving North America, Europe, Asia, and Latin America
• Full 20D series from 18V to 1800V for one-stop disc varistor sourcing
• Direct OEM replacement — pin-to-pin compatible with all major brands
• Engineering team available for cross-reference verification and support
• Free samples for testing and qualification upon request
• Direct manufacturer pricing with volume discounts available
• RoHS and REACH compliant with UL 1449 recognized component design
• UL 1449 recognized varistor component for mission-critical power systems

9. Ordering Information

10. FAQ

Q1: Is YINT 20D471K a direct replacement for Littelfuse V20E300P or Epcos B72220S2301K101?
A: Yes. YINT 20D471K has identical electrical specs and 20mm disc dimensions. It is a direct drop-in replacement.

Q2: What is the difference between 20D471K and 14D471K?
A: Both have 470V varistor voltage and 300V AC rating. 20D471K has a 20mm disc with 8000A Imax and 260J energy vs 6000A and 140J for the 14mm version.

Q3: What is the maximum surge current for 20D471K?
A: 8000A peak surge current for an 8/20µs waveform (single pulse). The nominal rated current is 4000A.

Q4: What is the energy rating of 20D471K?
A: 260J typical for a 2ms waveform, about 4.7x higher than the 10D471K and 1.9x higher than the 14D471K.

Q5: Can 20D471K replace 14D471K on an existing PCB?
A: Not directly. The 20mm disc has a larger footprint and different lead spacing. PCB layout must be verified.

Q6: What is the response time of 20D471K?
A: Less than 25 nanoseconds for fast clamping of lightning and switching transients.

Q7: Does YINT provide free samples?
A: Yes. Contact YINT with your project details for sample requests and qualification support.

11. Conclusion

YINT Electronics' 20D471K is the highest-rated metal oxide varistor in the 470V family, delivering 8000A peak surge current and 260J energy absorption. It provides maximum protection for 300V AC mains in heavy industrial and power distribution applications.

With 19+ years of varistor manufacturing experience, YINT delivers the 20D471K with competitive pricing, short lead times, and full technical support. Every order benefits from mature ceramic processing and rigorous quality control refined over nearly two decades of circuit protection manufacturing.

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