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5KASMC20AHM3/57 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts
Part Overview
The 5KASMC20AHM3/57 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division in the PAR® series. This surface mount component operates with a 20V reverse standoff voltage and 32.4V maximum clamping voltage, designed for transient overvoltage protection in electronic circuits. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 5KASMC20AHM3/57 |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener, Unidirectional |
| Voltage - Reverse Standoff (Typ) | 20V |
| Voltage - Breakdown (Min) | 22.2V |
| Voltage - Clamping (Max) @ Ipp | 32.4V |
| Power - Peak Pulse | 5000W (5kW) |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| Operating Temperature | -65°C ~ 185°C (TJ) |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the 5KASMC20AHM3/57 is determined by the following critical electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Voltage - Reverse Standoff (Typ): 20V
- Voltage - Breakdown (Min): 22.2V
- Voltage - Clamping (Max) @ Ipp: 32.4V (primary criterion; deviations up to ±10V acceptable for general applications)
- Power - Peak Pulse: 5000W (5kW) minimum
- Type: Zener, Unidirectional
- Unidirectional Channels: 1
Mechanical Compatibility Criteria:
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
Environmental & Compliance Criteria:
- Operating Temperature Range: -65°C to 185°C preferred; -55°C to 175°C acceptable
- RoHS Status: ROHS3 Compliant
- Product Status: Active preferred (obsolete parts create supply chain risk)
Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching 32.4V clamping voltage and 5kW power rating) and Functional Alternatives (meeting 20V standoff voltage with acceptable clamping voltage variance and power rating adjustments).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| 5KASMC20AHM3/57 | Vishay General Semiconductor - Diodes Division | 20V | 22.2V | 32.4V | — | 5000W (5kW) | -65°C ~ 185°C | DO-214AB, SMC | Obsolete |
| 5KASMC20AHM3_A/H | Vishay General Semiconductor - Diodes Division | 20V | 22.2V | 32.4V | 154.3A | 5000W (5kW) | -65°C ~ 185°C | DO-214AB, SMC | Active |
| 3.0SMC20A | Littelfuse Inc. | 20V | 22.2V | 42V | 570A (8/20µs) | — | -65°C ~ 150°C | DO-214AB, SMC | Active |
| 3.0SMCJ20A-13 | Diodes Incorporated | 20V | 22.2V | 32.4V | 62.6A | 3000W (3kW) | -55°C ~ 175°C | DO-214AB, SMC | Active |
| 5.0SMDJ20A | Taiwan Semiconductor Corporation | 20V | 22.2V | 32.4V | 155A | 5000W (5kW) | -55°C ~ 175°C | DO-214AB, SMC | Active |
| 5.0SMDJ20A-T7 | Littelfuse Inc. | 20V | 22.2V | 32.4V | 155A | 5000W (5kW) | -65°C ~ 150°C | DO-214AB, SMC | Active |
| LNBTVS4-222S | STMicroelectronics | 20V | 22V | 30V | 334A (8/20µs) | 22500W (22.5kW) | -55°C ~ 150°C | DO-214AB, SMC | Active |
| SMCJ20A | Fairchild Semiconductor | 20V | 22.2V | 32.4V | 46.3A | 1500W (1.5kW) | -55°C ~ 150°C | DO-214AB, SMC | Active |
| SMCJ20A-HR | Littelfuse Inc. | 20V | 22.2V | 32.4V | 46.3A | 1500W (1.5kW) | -65°C ~ 150°C | DO-214AB, SMC | Active |
Engineering Selection Recommendations
Tier 1 - Direct Equivalents (Preferred for Drop-In Replacement):
The 5KASMC20AHM3_A/H from Vishay General Semiconductor - Diodes Division is the primary equivalent. It maintains identical electrical specifications (20V standoff, 22.2V breakdown, 32.4V clamping, 5kW power rating) and mechanical compatibility (DO-214AB SMC package). This part is active and available in Tape & Reel packaging, eliminating supply chain risk associated with the obsolete 5KASMC20AHM3/57.
The 5.0SMDJ20A-T7 from Littelfuse Inc. and 5.0SMDJ20A from Taiwan Semiconductor Corporation provide equivalent electrical performance with 5kW peak pulse power and 32.4V clamping voltage. Both are active products in DO-214AB SMC packages. The 5.0SMDJ20A-T7 supports the extended temperature range (-65°C to 150°C) closer to the original specification.
Tier 2 - Functional Alternatives (Acceptable for New Designs):
The 3.0SMCJ20A-13 from Diodes Incorporated meets the 20V standoff and 32.4V clamping requirements with active product status and high inventory availability. The 3kW power rating represents a reduction from the original 5kW specification; this substitution is acceptable only where circuit transient energy requirements do not exceed 3kW.
The SMCJ20A from Fairchild Semiconductor and SMCJ20A-HR from Littelfuse Inc. provide 32.4V clamping voltage with 20V standoff. Both are active products in DO-214AB SMC packages. The 1.5kW power rating is significantly reduced; these parts are suitable only for low-energy transient suppression applications.
The 3.0SMC20A from Littelfuse Inc. and LNBTVS4-222S from STMicroelectronics offer higher peak pulse current and power handling (22.5kW for LNBTVS4-222S). The 3.0SMC20A exhibits 42V clamping voltage, representing a 9.6V increase from the original specification; this is acceptable where circuit voltage margins permit. The LNBTVS4-222S provides superior transient energy absorption with 22.5kW capability, suitable for high-stress protection applications.
Compliance & Certification:
All substitute parts maintain ROHS3 compliance and are active products with established supply chains. The original part's AEC-Q101 automotive qualification is not universally matched across all substitutes; designs requiring automotive-grade certification should prioritize 5KASMC20AHM3_A/H or verify alternative part qualification status with manufacturers.
Frequently Asked Questions (FAQ)
Q: Can I use 3.0SMCJ20A-13 as a direct replacement for 5KASMC20AHM3/57?
A: The 3.0SMCJ20A-13 is electrically compatible for the 20V standoff and 32.4V clamping voltage specifications. However, the 3kW power rating is 40% lower than the original 5kW specification. Substitution is valid only if circuit transient energy does not exceed 3kW. Verify your application's peak pulse power requirement before selection.
Q: What is the difference between the 5KASMC20AHM3_A/H and 5.0SMDJ20A-T7?
A: Both parts provide identical electrical performance (20V standoff, 32.4V clamping, 5kW power, 155A peak pulse current) and DO-214AB SMC packaging. The 5KASMC20AHM3_A/H is manufactured by Vishay and supports -65°C to 185°C operating temperature. The 5.0SMDJ20A-T7 is manufactured by Littelfuse and supports -65°C to 150°C. Select based on temperature range requirements and manufacturer preference for your supply chain.
Q: Why does LNBTVS4-222S have a 22.5kW power rating when the original is 5kW?
A: The LNBTVS4-222S is a higher-performance TVS diode from STMicroelectronics designed for applications requiring superior transient energy absorption. The 22.5kW rating indicates greater capability for handling severe overvoltage transients. This part is suitable for high-stress protection applications but may introduce unnecessary cost and board space considerations for standard applications. Use only where circuit transient severity justifies the upgrade.
Q: Are all substitute parts available in the same DO-214AB SMC package?
A: Yes. All substitute parts listed are available in DO-214AB SMC surface mount packages, ensuring mechanical compatibility with existing PCB layouts and assembly processes. Verify packaging specifications (Tape & Reel vs. Bulk) with your supplier to confirm availability in your required format.
Q: Can I substitute SMCJ20A for 5KASMC20AHM3/57 in automotive applications?
A: The SMCJ20A from Fairchild Semiconductor is electrically compatible (20V standoff, 32.4V clamping) but has a 1.5kW power rating versus the original 5kW. Additionally, the original part carries AEC-Q101 automotive qualification; SMCJ20A does not list this certification. For automotive applications, prioritize 5KASMC20AHM3_A/H or verify alternative part qualification status with the manufacturer before implementation.
Q: What is the impact of using 3.0SMC20A with 42V clamping voltage instead of 32.4V?
A: The 3.0SMC20A exhibits 42V maximum clamping voltage, which is 9.6V higher than the original 32.4V specification. This higher clamping voltage provides less aggressive transient suppression, allowing higher voltage spikes to reach protected circuitry. Substitution is acceptable only if downstream components tolerate voltages up to 42V without damage. Verify circuit voltage margins and component ratings before selection.
Q: Which substitute part has the best inventory availability?
A: The 3.0SMCJ20A-13 from Diodes Incorporated shows the highest inventory level at 71,647 pieces in stock. The SMCJ20A from Fairchild Semiconductor also maintains substantial inventory at 23,864 pieces. For supply chain continuity, these parts offer the lowest procurement risk.
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