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3KASMC20AHE3_A/I Equivalent & Substitute Parts
Part Overview
The 3KASMC20AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AB (SMC) package. This component is rated for 20V reverse standoff voltage with a 32.4V maximum clamping voltage and 92.6A peak pulse current capability, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.
The 3KASMC20AHE3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical and mechanical specifications, ensuring design continuity and supply chain flexibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 20 | V |
| Voltage - Breakdown (Min) | 22.2 | V |
| Voltage - Clamping (Max) @ Ipp | 32.4 | V |
| Current - Peak Pulse (10/1000µs) | 92.6 | A |
| Power - Peak Pulse | 3000 | W |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
| Package / Case | DO-214AB, SMC | - |
| Mounting Type | Surface Mount | - |
| Operating Temperature Range | -65°C ~ 185°C (TJ) | - |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC20AHE3_A/I is determined by strict alignment with the following electrical and mechanical parameters:
Critical Substitution Parameters:
- Voltage - Reverse Standoff (Typ): 20V
- Voltage - Breakdown (Min): 22.2V
- Voltage - Clamping (Max) @ Ipp: 32.4V
- Current - Peak Pulse (10/1000µs): 92.6A (or higher)
- Power - Peak Pulse: 3000W (or higher)
- Type: Zener, Unidirectional
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
All substitute parts listed maintain identical voltage specifications (20V standoff, 22.2V breakdown minimum, 32.4V clamping maximum) and unidirectional zener topology. Peak pulse current and power ratings are equal to or exceed the original specification. All parts are surface mount in DO-214AB/SMC packaging and comply with ROHS3 requirements.
Substitute parts are grouped into two categories: direct electrical equivalents with 92.6A peak pulse current (3000W power rating), and higher-performance alternatives with increased current handling (155A, 5000W) that maintain full backward compatibility.
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 | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| 3KASMC20AHE3_A/I | Vishay General Semiconductor - Diodes Division | 20V | 22.2V | 32.4V | 92.6A | 3000W | -65°C ~ 185°C | Obsolete | DO-214AB (SMCJ) |
| 3KASMC20AHE3_B/I | Vishay General Semiconductor - Diodes Division | 20V | 22.2V | 32.4V | 92.6A | 3000W | -65°C ~ 185°C | Active | DO-214AB (SMC) |
| SM30T23AY | STMicroelectronics | 20V | 22.2V | 32.4V | 92.6A | 3000W | -55°C ~ 175°C | Active | DO-214AB, SMC |
| SMDJ20A | Alpha & Omega Semiconductor Inc. | 20V | 22.2V | 32.4V | 92.6A | 3000W | -55°C ~ 150°C | Active | DO-214AB, SMC |
| SMDJ20A-HR | Littelfuse Inc. | 20V | 22.2V | 32.4V | 92.6A | 3000W | -65°C ~ 150°C | Active | DO-214AB (SMCJ) |
| SMDJ20A-HRAT7 | Littelfuse Inc. | 20V | 22.2V | 32.4V | 92.6A | 3000W | -65°C ~ 150°C | Active | DO-214AB (SMCJ) |
| SMLJ20A-TP | Micro Commercial Co | 20V | 22.2V | 32.4V | 92.6A | 3000W | -55°C ~ 175°C | Active | DO-214AB, SMC |
| SMLJ20AE3/TR13 | Microchip Technology | 20V | 22.2V | 32.4V | 92.6A | 3000W | -55°C ~ 150°C | Active | DO-214AB, SMC |
| TPSMD20A | Littelfuse Inc. | 20V | 22.2V | 32.4V | 92.6A | 3000W | -65°C ~ 150°C | Active | DO-214AB (SMCJ) |
| 3.0SMCJ20A-13 | Diodes Incorporated | 20V | 22.2V | 32.4V | 62.6A | 3000W | -55°C ~ 175°C | Active | DO-214AB, SMC |
| 5.0SMDJ20A | Taiwan Semiconductor Corporation | 20V | 22.2V | 32.4V | 155A | 5000W | -55°C ~ 175°C | Active | DO-214AB (SMC) |
Engineering Selection Recommendations
Primary Recommendation: 3KASMC20AHE3_B/I
The 3KASMC20AHE3_B/I is the direct active equivalent from the original manufacturer, Vishay General Semiconductor - Diodes Division. This part maintains identical electrical specifications (20V standoff, 32.4V clamping, 92.6A peak pulse, 3000W power) and identical operating temperature range (-65°C ~ 185°C). The only difference is packaging format (Tape & Reel vs. bulk), making this the optimal replacement for the obsolete 3KASMC20AHE3_A/I. Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance.
Secondary Recommendations: TPSMD20A, SMDJ20A-HR, SMDJ20A-HRAT7
These Littelfuse parts provide active status with full electrical equivalence (20V standoff, 32.4V clamping, 92.6A peak pulse, 3000W power). TPSMD20A and SMDJ20A-HR extend the lower operating temperature limit to -65°C, matching the original specification. SMDJ20A-HRAT7 also supports -65°C minimum temperature. All three are available in DO-214AB (SMCJ) packaging and comply with ROHS3 requirements.
Alternative Options: SM30T23AY, SMLJ20A-TP, SMLJ20AE3/TR13, SMDJ20A
These parts maintain full electrical equivalence with identical voltage and current specifications. Operating temperature ranges vary between -55°C and -65°C minimum, and -150°C to -175°C maximum. All are active products in DO-214AB/SMC packaging with ROHS3 compliance. Selection among these alternatives depends on specific thermal environment requirements and packaging preferences.
Higher-Performance Alternative: 5.0SMDJ20A
The 5.0SMDJ20A from Taiwan Semiconductor Corporation provides enhanced current handling (155A peak pulse) and power dissipation (5000W), while maintaining identical voltage specifications. This part is suitable for applications requiring additional transient energy absorption margin. Operating temperature range is -55°C ~ 175°C.
Note on 3.0SMCJ20A-13:
The 3.0SMCJ20A-13 from Diodes Incorporated maintains voltage specifications but has reduced peak pulse current (62.6A vs. 92.6A). This part is suitable only for applications with lower transient current requirements and should not be used as a direct replacement where the full 92.6A specification is required.
Frequently Asked Questions (FAQ)
Q: Can I use any of these substitute parts as a direct replacement for the 3KASMC20AHE3_A/I?
A: Yes, all listed substitute parts except 3.0SMCJ20A-13 are direct electrical equivalents with identical voltage specifications (20V standoff, 22.2V breakdown minimum, 32.4V clamping maximum) and peak pulse current (92.6A). They are all surface mount in DO-214AB/SMC packaging. The 3.0SMCJ20A-13 has reduced peak pulse current (62.6A) and should only be used if your application does not require the full 92.6A specification.
Q: What is the difference between the 3KASMC20AHE3_A/I and 3KASMC20AHE3_B/I?
A: Both parts are manufactured by Vishay and have identical electrical specifications and operating temperature ranges (-65°C ~ 185°C). The primary difference is packaging: the _A/I variant uses bulk packaging while the _B/I variant uses Tape & Reel (TR) format. The _B/I is currently active in production, making it the recommended replacement for the obsolete _A/I.
Q: Do all substitute parts have the same operating temperature range?
A: No. The original 3KASMC20AHE3_A/I operates from -65°C ~ 185°C. Most substitutes operate within -55°C ~ 175°C or -55°C ~ 150°C ranges. If your application requires the full -65°C ~ 185°C range, select from: 3KASMC20AHE3_B/I, SMDJ20A-HR, SMDJ20A-HRAT7, or TPSMD20A.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original part.
Q: What is the difference between the 92.6A and 155A peak pulse current options?
A: The 5.0SMDJ20A provides 155A peak pulse current and 5000W power dissipation compared to the standard 92.6A / 3000W specification. This higher-performance variant is suitable for applications with greater transient energy requirements or where additional design margin is desired. It maintains identical voltage specifications and is fully backward compatible.
Q: Can I use the 3.0SMCJ20A-13 as a replacement?
A: The 3.0SMCJ20A-13 has reduced peak pulse current (62.6A vs. 92.6A) and should only be used if your circuit design does not require the full 92.6A specification. For direct replacement with identical current handling, use one of the other listed alternatives.
Q: What packaging formats are available?
A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and bulk. The DO-214AB (SMCJ) and DO-214AB (SMC) designations refer to the physical component package, which is identical across all variants. Packaging format selection depends on your procurement and assembly requirements.
Q: Are these parts suitable for automotive applications?
A: The original 3KASMC20AHE3_A/I carries AEC-Q101 automotive qualification. Among substitutes, 3KASMC20AHE3_B/I and TPSMD20A also carry AEC-Q101 qualification. Other substitutes are suitable for general-purpose applications. Verify AEC-Q101 requirement with your design specifications before final part selection.
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