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Equivalent & Substitute Parts for 3KASMC26AHM3_A/I
Part Overview
The 3KASMC26AHM3_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 operates with a 26V reverse standoff voltage and provides 42.1V maximum clamping voltage at peak pulse current of 71.3A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.
The 3KASMC26AHM3_A/I is currently listed as obsolete. Equivalent substitute parts are available from multiple manufacturers with identical or enhanced electrical specifications, 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 to 185 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC26AHM3_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: Minimum 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 1 - Direct Electrical Equivalents: Parts with identical voltage ratings (26V standoff, 28.9V breakdown, 42.1V clamping) and peak pulse current of 71.3A at 3000W power dissipation. These parts are fully interchangeable without circuit modification.
Category 2 - Enhanced Performance Substitutes: Parts with identical voltage ratings but higher peak pulse current (119A) or lower peak pulse power (1500W). These parts meet or exceed the minimum electrical requirements and are suitable for applications where the original specification can accommodate the enhanced or reduced performance characteristics.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3KASMC26AHM3_A/I | Vishay | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 185 | DO-214AB (SMC) | Obsolete | Yes |
| 3KASMC26AHM3_B/I | Vishay | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 185 | DO-214AB (SMC) | Active | Yes |
| SM30T30AY | STMicroelectronics | 26 | 28.9 | 42.1 | 71.3 | 3000 | -55 to 175 | DO-214AB (SMC) | Active | Yes |
| SMDJ26A | Alpha & Omega Semiconductor Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -55 to 150 | DO-214AB (SMC) | Active | No |
| SMDJ26A-HR | Littelfuse Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 150 | DO-214AB (SMC) | Active | No |
| SMDJ26A-HRA | Littelfuse Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 150 | DO-214AB (SMC) | Active | No |
| SMDJ26A-HRAT7 | Littelfuse Inc. | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 150 | DO-214AB (SMC) | Active | No |
| TPSMD26A | Littelfuse | 26 | 28.9 | 42.1 | 71.3 | 3000 | -65 to 150 | DO-214AB (SMC) | Active | Yes |
| 5.0SMDJ26A | Taiwan Semiconductor Corporation | 26 | 28.9 | 42.1 | 119 | 5000 | -55 to 175 | DO-214AB (SMC) | Active | No |
| SMCJ26A | MDD | 26 | 28.9 | 42.1 | 35.7 | 1500 | -50 to 150 | DO-214AB (SMC) | Active | No |
| SMCJ26A | MDD | 26 | 28.9 | 42.1 | 35.7 | 1500 | -50 to 150 | DO-214AB (SMC) | Active | No |
Engineering Selection Recommendations
Primary Recommendation - Automotive Applications: For designs requiring AEC-Q101 qualification and automotive-grade reliability, select either 3KASMC26AHM3_B/I (Vishay, active status) or TPSMD26A (Littelfuse, active status). Both parts maintain identical electrical specifications to the obsolete 3KASMC26AHM3_A/I while offering active product status and full automotive qualification.
Secondary Recommendation - General Purpose Applications: SM30T30AY (STMicroelectronics) provides identical electrical performance with active product status and AEC-Q101 qualification. Operating temperature range is -55°C to 175°C, which is suitable for most industrial and consumer applications.
Alternative for Extended Temperature Range: SMDJ26A-HR or SMDJ26A-HRA (Littelfuse) maintain the -65°C lower temperature limit of the original part, supporting applications requiring extended low-temperature operation. These parts are active and widely available.
Enhanced Performance Option: 5.0SMDJ26A (Taiwan Semiconductor Corporation) offers higher peak pulse current (119A) and power dissipation (5000W) while maintaining identical voltage ratings. This part is suitable for applications where increased transient energy absorption is beneficial.
Cost-Optimized Option: SMCJ26A (MDD) provides voltage rating compatibility with reduced peak pulse current (35.7A) and power dissipation (1500W). This part is appropriate only for applications where the lower power rating meets circuit protection requirements.
Frequently Asked Questions (FAQ)
Q: Can I use 3KASMC26AHM3_B/I as a direct replacement for 3KASMC26AHM3_A/I?
A: Yes. The 3KASMC26AHM3_B/I is a direct electrical and mechanical equivalent with identical voltage ratings (26V standoff, 28.9V breakdown, 42.1V clamping), peak pulse current (71.3A), power dissipation (3000W), and DO-214AB (SMC) package. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. bulk).
Q: What is the difference between SMDJ26A and SMDJ26A-HR?
A: Both parts share identical electrical specifications (26V standoff, 28.9V breakdown, 42.1V clamping, 71.3A peak pulse, 3000W power). The SMDJ26A-HR variant extends the lower operating temperature limit to -65°C (compared to -55°C for standard SMDJ26A), making it suitable for applications requiring enhanced cold-temperature performance.
Q: Can I substitute SMCJ26A for the original 3KASMC26AHM3_A/I?
A: SMCJ26A maintains voltage rating compatibility (26V standoff, 28.9V breakdown, 42.1V clamping) but provides reduced peak pulse current (35.7A vs. 71.3A) and lower power dissipation (1500W vs. 3000W). Substitution is only valid if the circuit protection requirements can be met with the lower current and power ratings.
Q: Is 5.0SMDJ26A a suitable substitute?
A: 5.0SMDJ26A maintains identical voltage ratings but provides enhanced performance with 119A peak pulse current and 5000W power dissipation. This part is suitable for applications where increased transient energy absorption is acceptable or beneficial. The DO-214AB (SMC) package remains compatible.
Q: Which substitute part has the widest operating temperature range?
A: The original 3KASMC26AHM3_A/I operates from -65°C to 185°C. Among active substitutes, 3KASMC26AHM3_B/I (Vishay) maintains this full range. SM30T30AY (STMicroelectronics) operates from -55°C to 175°C, and SMDJ26A-HR (Littelfuse) extends to -65°C on the lower end but limits to 150°C on the upper end.
Q: Are all substitute parts ROHS3 and REACH compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements equivalent to the original part.
Q: What is the significance of AEC-Q101 qualification?
A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Among the listed substitutes, 3KASMC26AHM3_B/I, SM30T30AY, and TPSMD26A carry AEC-Q101 qualification, making them preferred choices for automotive applications.
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