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3KASMC26HE3_A/I Equivalent & Substitute Parts
Part Overview
The 3KASMC26HE3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 26V reverse standoff voltage with 46.6V clamping voltage and 64.4A peak pulse current. This component is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 26V |
| Voltage - Breakdown (Min) | 28.9V |
| Voltage - Clamping (Max) @ Ipp | 46.6V |
| Current - Peak Pulse (10/1000µs) | 64.4A |
| Power - Peak Pulse | 3000W |
| Operating Temperature Range | -65°C ~ 185°C (TJ) |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| Type | Zener |
| Unidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Grade | Automotive |
| Qualification | AEC-Q101 |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following criteria:
- Voltage - Reverse Standoff (Typ): 26V
- Voltage - Breakdown (Min): 28.9V
- Unidirectional Channels: 1
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener
Substitute parts are grouped into two categories based on clamping voltage and peak pulse current characteristics:
Group A (Matched Clamping Voltage 46.6V): Parts with identical clamping voltage and peak pulse current specifications, suitable for direct replacement in applications requiring the original electrical performance envelope.
Group B (Alternative Clamping Voltage 42.1V): Parts with lower clamping voltage (42.1V) and varying peak pulse current ratings, suitable for applications where the lower clamping threshold is acceptable and provides enhanced transient suppression.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse | Power - Peak Pulse | Operating Temperature | Product Status | Grade |
|---|---|---|---|---|---|---|---|---|
| 3KASMC26HE3_A/I | Vishay | 26V | 46.6V | 64.4A | 3000W | -65°C ~ 185°C | Obsolete | Automotive |
| 3KASMC26AHE3_B/I | Vishay | 26V | 42.1V | 71.3A | 3000W | -65°C ~ 185°C | Active | Automotive |
| SMLJ26E3/TR13 | Microchip Technology | 26V | 46.6V | 64.4A | 300W | -55°C ~ 150°C | Active | General |
| 1SMC26A TR13 PBFREE | Central Semiconductor Corp | 26V | 42.1V | 35.6A | 1500W | -65°C ~ 150°C | Active | General |
| 3SMC26A TR13 PBFREE | Central Semiconductor Corp | 26V | 42.1V | 71.2A | 3000W | -65°C ~ 150°C | Active | General |
| 5.0SMDJ26A | Taiwan Semiconductor Corporation | 26V | 42.1V | 119A | 5000W | -55°C ~ 175°C | Active | General |
| SM30T30AY | STMicroelectronics | 26V | 42.1V | 71.3A | 3000W | -55°C ~ 175°C | Active | Automotive |
| SMC30J26A | STMicroelectronics | 26V | 42.1V | 71A | 3000W | -55°C ~ 175°C | Active | General |
| SMCJ26A | MDD | 26V | 42.1V | 35.7A | 1500W | -50°C ~ 150°C | Active | General |
Engineering Selection Recommendations
For Automotive Applications with Extended Temperature Range:
3KASMC26AHE3_B/I (Vishay) is the primary active equivalent. It maintains automotive grade qualification (AEC-Q101), extended operating temperature range (-65°C ~ 185°C), and identical 3000W peak pulse power rating. The clamping voltage reduction from 46.6V to 42.1V provides enhanced transient suppression margin. This part is the direct successor in the Vishay PAR® series.
SM30T30AY (STMicroelectronics) provides an alternative automotive-qualified option with AEC-Q101 certification, 3000W peak pulse power, and 42.1V clamping voltage. Operating temperature range is -55°C ~ 175°C, which may be limiting for applications requiring the full -65°C lower bound.
For General Purpose Applications:
3SMC26A TR13 PBFREE (Central Semiconductor Corp) and SMC30J26A (STMicroelectronics) both deliver 3000W peak pulse power with 42.1V clamping voltage and 71A/71.2A peak pulse current. These parts are suitable for non-automotive applications where AEC-Q101 qualification is not required.
5.0SMDJ26A (Taiwan Semiconductor Corporation) offers the highest peak pulse current (119A) and power rating (5000W) with 42.1V clamping voltage, suitable for high-energy transient suppression applications.
For Lower Power Applications:
1SMC26A TR13 PBFREE (Central Semiconductor Corp) and SMCJ26A (MDD) provide 1500W peak pulse power with 42.1V clamping voltage and lower peak pulse current (35.6A / 35.7A), appropriate for lower-energy transient environments.
For Matched Electrical Performance:
SMLJ26E3/TR13 (Microchip Technology) maintains the original 46.6V clamping voltage and 64.4A peak pulse current. However, the 300W peak pulse power rating is significantly lower than the original 3000W specification, limiting applicability to low-energy transient scenarios only.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with 42.1V clamping voltage instead of the original 46.6V?
A: Yes, if the application circuit design permits. The 42.1V clamping voltage is lower, meaning the TVS diode will suppress transients at a lower voltage threshold. This provides enhanced protection margin in most applications. Verify that downstream components tolerate the lower clamping voltage without performance degradation.
Q: What is the significance of peak pulse current and power ratings?
A: Peak pulse current (Ipp) and power rating determine the maximum transient energy the TVS diode can safely dissipate. Higher ratings accommodate larger transient events. Select a substitute with equal or higher ratings to maintain or improve transient suppression capability. Lower ratings may be insufficient for high-energy transient environments.
Q: Is the SMLJ26E3/TR13 a suitable replacement despite its lower power rating?
A: The SMLJ26E3/TR13 matches the original clamping voltage (46.6V) and peak pulse current (64.4A) but provides only 300W peak pulse power versus the original 3000W. This part is suitable only for applications with low-energy transient events. For applications requiring the full 3000W dissipation capability, select alternatives with higher power ratings.
Q: Why do some substitutes have lower operating temperature ranges?
A: Operating temperature range is a manufacturing and qualification specification. Parts with -55°C lower bound (versus -65°C) may be acceptable for applications operating within the -55°C ~ 175°C envelope. Verify application temperature requirements before selection. Automotive-grade parts (AEC-Q101) typically maintain extended ranges.
Q: Are all substitute parts RoHS3 compliant?
A: Yes, all listed substitute parts are RoHS3 compliant, matching the original part's environmental compliance status.
Q: What is the difference between automotive-grade and general-purpose TVS diodes?
A: Automotive-grade parts carry AEC-Q101 qualification, indicating compliance with automotive reliability and quality standards. These parts undergo additional qualification testing and are suitable for automotive and mission-critical applications. General-purpose parts lack this certification and are appropriate for consumer and industrial applications where automotive qualification is not required.
Q: Can I substitute a part with higher peak pulse current than the original?
A: Yes. Higher peak pulse current indicates enhanced transient suppression capability. This substitution is generally safe and may improve circuit protection. Verify that the package and mounting type remain compatible with the PCB layout.
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