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3KASMC26AHE3_A/I Equivalent & Substitute Parts
Part Overview
The 3KASMC26AHE3_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 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 71.3A 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 3KASMC26AHE3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or superior electrical characteristics, ensuring design continuity and supply chain flexibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 26 | V |
| Voltage - Breakdown (Min) | 28.9 | V |
| Voltage - Clamping (Max) @ Ipp | 42.1 | V |
| Current - Peak Pulse (10/1000µs) | 71.3 | A |
| Power - Peak Pulse | 3000 | W |
| Operating Temperature Range | -65°C ~ 185°C | TJ |
| Package / Case | DO-214AB, SMC | - |
| Mounting Type | Surface Mount | - |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
| Grade | Automotive | - |
| Qualification | AEC-Q101 | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC26AHE3_A/I is determined by the following critical parameters:
- Voltage Rating: Reverse standoff voltage of 26V, breakdown minimum of 28.9V, and clamping voltage maximum of 42.1V
- Current Handling: Peak pulse current of 71.3A at 10/1000µs pulse width
- Power Dissipation: 3000W peak pulse power rating
- Package: DO-214AB (SMC) surface mount package
- Diode Type: Unidirectional Zener configuration with single channel
- Compliance: ROHS3 and REACH compliance required
Substitute parts are grouped into two categories:
Category A - Direct Electrical & Mechanical Equivalents: Parts with identical voltage ratings, clamping characteristics, current handling (71.3A ±0.1A), 3000W power rating, and DO-214AB SMC package. These parts are fully interchangeable without circuit modification.
Category B - Enhanced Performance Substitutes: Parts with identical voltage ratings and clamping characteristics but higher peak pulse current (119A) or higher power dissipation (5000W). These parts provide superior transient protection and are backward compatible with the original design.
Category C - Reduced Performance Substitutes: Parts with identical voltage ratings and clamping characteristics but lower peak pulse current (35.6A) and 1500W power rating. These parts are suitable only for applications with reduced transient energy requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | Product Status | AEC-Q101 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3KASMC26AHE3_A/I | Vishay | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 ~ 185 | DO-214AB, SMC | Obsolete | Yes |
| 3KASMC26AHE3_B/I | Vishay | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 ~ 185 | DO-214AB, SMC | Active | Yes |
| SM30T30AY | STMicroelectronics | 26 | 28.9 | 42.1 | 71.3 | 3000 | -55 ~ 175 | DO-214AB, SMC | Active | Yes |
| SMDJ26A | Alpha & Omega Semiconductor Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -55 ~ 150 | DO-214AB, SMC | Active | No |
| SMDJ26A-HR | Littelfuse Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 ~ 150 | DO-214AB, SMC | Active | No |
| SMDJ26A-HRA | Littelfuse Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 ~ 150 | DO-214AB, SMC | Active | No |
| TPSMD26A | Littelfuse | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 ~ 150 | DO-214AB, SMC | Active | Yes |
| 1SMC26A TR13 PBFREE | Central Semiconductor Corp | 26 | 28.9 | 42.1 | 35.6 | 1500 | -65 ~ 150 | DO-214AB, SMC | Active | No |
| 3SMC26A TR13 PBFREE | Central Semiconductor Corp | 26 | 28.9 | 42.1 | 71.2 | 3000 | -65 ~ 150 | DO-214AB, SMC | Active | No |
| 5.0SMDJ26A | Taiwan Semiconductor Corporation | 26 | 28.9 | 42.1 | 119 | 5000 | -55 ~ 175 | DO-214AB, SMC | Active | No |
| SMC30J26A | STMicroelectronics | 26 | 28.9 | 42.1 | 71 | 3000 | -55 ~ 175 | DO-214AB, SMC | Active | No |
Engineering Selection Recommendations
For Automotive Applications with AEC-Q101 Requirement:
The 3KASMC26AHE3_B/I (Vishay, Active status) is the direct replacement. It maintains identical electrical specifications, automotive grade qualification, AEC-Q101 certification, and extended operating temperature range (-65°C to 185°C). This part is available in Tape & Reel packaging and provides supply continuity from the original manufacturer.
The TPSMD26A (Littelfuse, Active status) is an alternative with AEC-Q101 qualification, identical electrical performance, and automotive grade designation. Operating temperature range is -65°C to 150°C.
For General Purpose Applications:
The SM30T30AY (STMicroelectronics, Active status) provides identical electrical characteristics with AEC-Q101 qualification and automotive grade. Operating temperature range is -55°C to 175°C. This part has high inventory availability (7700 pcs).
The 3SMC26A TR13 PBFREE (Central Semiconductor Corp, Active status) delivers equivalent electrical performance with peak pulse current of 71.2A and 3000W power rating. Operating temperature range is -65°C to 150°C.
The SMC30J26A (STMicroelectronics, Active status) provides equivalent electrical performance with peak pulse current of 71A and 3000W power rating. Operating temperature range is -55°C to 175°C.
For Enhanced Transient Protection:
The 5.0SMDJ26A (Taiwan Semiconductor Corporation, Active status) offers superior performance with 119A peak pulse current and 5000W power dissipation. This part is backward compatible and suitable for applications requiring higher transient energy absorption. Operating temperature range is -55°C to 175°C.
For Reduced Transient Energy Applications:
The 1SMC26A TR13 PBFREE (Central Semiconductor Corp, Active status) is suitable only for applications with lower transient energy requirements, delivering 35.6A peak pulse current and 1500W power dissipation. Operating temperature range is -65°C to 150°C.
Frequently Asked Questions (FAQ)
Q: Can I use 3KASMC26AHE3_B/I as a direct replacement for 3KASMC26AHE3_A/I?
A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (26V reverse standoff, 42.1V clamping, 71.3A peak pulse current, 3000W power), DO-214AB SMC package, automotive grade, and AEC-Q101 qualification. The primary difference is product status: the _A/I variant is obsolete while the _B/I variant is active. The _B/I is supplied in Tape & Reel packaging.
Q: What is the difference between the 3SMC26A TR13 PBFREE and SMDJ26A variants?
A: Both parts meet the core voltage and clamping specifications (26V standoff, 28.9V breakdown, 42.1V clamping). The 3SMC26A TR13 PBFREE delivers 71.2A peak pulse current and 3000W power, while SMDJ26A delivers 71.3A peak pulse current and 3000W power. The difference in peak pulse current (0.1A) is negligible for circuit design purposes. The 3SMC26A is manufactured by Central Semiconductor Corp, while SMDJ26A is manufactured by Alpha & Omega Semiconductor Inc.
Q: Are all substitute parts available in the same DO-214AB SMC package?
A: Yes. All listed substitute parts are available in the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with the original design. Packaging format varies (some are supplied in Tape & Reel, others in bulk), but the component package remains consistent.
Q: Which substitute part has the widest operating temperature range?
A: The 3KASMC26AHE3_A/I and 3KASMC26AHE3_B/I (both Vishay) operate from -65°C to 185°C, providing the widest temperature range. The SM30T30AY and SMC30J26A (both STMicroelectronics) and 5.0SMDJ26A (Taiwan Semiconductor Corporation) operate from -55°C to 175°C. The SMDJ26A, SMDJ26A-HR, SMDJ26A-HRA, and 1SMC26A TR13 PBFREE operate from -55°C to 150°C or -65°C to 150°C.
Q: Can I use the 5.0SMDJ26A in place of the original part?
A: Yes. The 5.0SMDJ26A maintains identical voltage ratings (26V standoff, 28.9V breakdown, 42.1V clamping) and is backward compatible. It provides enhanced performance with 119A peak pulse current and 5000W power dissipation compared to the original 71.3A and 3000W. This part is suitable for applications requiring higher transient energy absorption without circuit modification.
Q: What is the significance of AEC-Q101 qualification?
A: AEC-Q101 is the automotive industry standard qualification for discrete semiconductors. Parts meeting this qualification have undergone rigorous testing for reliability, temperature cycling, and performance consistency. For automotive applications, AEC-Q101 certification is mandatory. The 3KASMC26AHE3_B/I, SM30T30AY, and TPSMD26A all carry AEC-Q101 qualification.
Q: Is the 1SMC26A TR13 PBFREE a suitable replacement?
A: The 1SMC26A TR13 PBFREE maintains identical voltage specifications but delivers only 35.6A peak pulse current and 1500W power dissipation, compared to the original 71.3A and 3000W. This part is suitable only for applications with reduced transient energy requirements. It is not recommended as a direct replacement for designs requiring full 3000W protection.
Q: What does "PBFREE" designation mean?
A: PBFREE indicates lead-free construction, compliant with RoHS (Restriction of Hazardous Substances) regulations. All listed substitute parts are ROHS3 compliant and lead-free.
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