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3KASMC43AHM3_A/H Equivalent & Substitute Parts
Part Overview
The 3KASMC43AHM3_A/H is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 43V reverse standoff with 69.4V clamping voltage and 3000W peak pulse power dissipation. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 43V |
| Voltage - Breakdown (Min) | 47.8V |
| Voltage - Clamping (Max) @ Ipp | 69.4V |
| Current - Peak Pulse (10/1000µs) | 43.2A |
| Power - Peak Pulse | 3000W |
| 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 is determined by strict equivalence across the following critical parameters: reverse standoff voltage (43V), breakdown voltage minimum (47.8V), clamping voltage maximum (69.4V), peak pulse current (43.2A nominal), peak pulse power (3000W), package type (DO-214AB/SMC), and surface mount configuration. Parts are grouped into two categories:
Category 1: Direct Electrical & Mechanical Equivalents (3000W Rating) Parts maintaining all specified electrical parameters and 3000W power rating with identical or compatible operating temperature ranges and compliance certifications.
Category 2: Enhanced Performance Alternatives (5000W Rating) Parts exceeding the 3000W specification with higher peak pulse current (72.1A) and 5000W power rating, suitable for applications requiring additional transient energy absorption margin while maintaining voltage regulation parameters.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff | Voltage - Clamping (Max) | Current - Peak Pulse | Power - Peak Pulse | Operating Temperature | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|
| 3KASMC43AHM3_A/H | Vishay General Semiconductor | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 185°C | Obsolete | Tape & Reel |
| 3KASMC43AHM3_B/H | Vishay General Semiconductor | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 185°C | Active | Tape & Reel |
| 3SMC43A TR13 PBFREE | Central Semiconductor Corp | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 150°C | Active | Tape & Reel |
| SMDJ43A | Alpha & Omega Semiconductor Inc. | 43V | 69.4V | 43.3A | 3000W | -55°C ~ 150°C | Active | Tape & Reel |
| SMDJ43A-HR | Littelfuse Inc. | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 150°C | Active | Tape & Reel |
| SMDJ43A-HRA | Littelfuse Inc. | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 150°C | Active | Tape & Reel |
| SMDJ43A-HRAT7 | Littelfuse Inc. | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 150°C | Active | Tape & Reel |
| SMLJ43AE3/TR13 | Microchip Technology | 43V | 69.4V | 43.2A | 300W | -55°C ~ 150°C | Active | Tape & Reel |
| TPSMD43A | Littelfuse Inc. | 43V | 69.4V | 43.2A | 3000W | -65°C ~ 150°C | Active | Tape & Reel |
| 5.0SMDJ43A | Taiwan Semiconductor Corporation | 43V | 69.4V | 72.1A | 5000W | -55°C ~ 175°C | Active | Tape & Reel |
| 5.0SMDJ43A-T7 | Littelfuse Inc. | 43V | 69.4V | 72.1A | 5000W | -65°C ~ 150°C | Active | Tape & Reel |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents)
3KASMC43AHM3_B/H from Vishay General Semiconductor is the direct successor to the obsolete 3KASMC43AHM3_A/H variant, maintaining identical electrical specifications, operating temperature range (-65°C ~ 185°C), and automotive-grade AEC-Q101 qualification. This part is the preferred replacement for existing designs.
TPSMD43A from Littelfuse Inc. provides full electrical equivalence with 3000W power rating, automotive-grade qualification, and AEC-Q101 certification. Operating temperature range is -65°C ~ 150°C, which is acceptable for most applications within the original part's thermal envelope.
SMDJ43A-HR, SMDJ43A-HRA, and SMDJ43A-HRAT7 from Littelfuse Inc. are functionally equivalent with identical voltage and current specifications. These parts are active products with ROHS3 compliance and MSL 1 rating. Operating temperature maximum is 150°C, which represents a 35°C reduction from the original specification.
Secondary Substitutes (Functional Equivalents with Deviations)
3SMC43A TR13 PBFREE from Central Semiconductor Corp maintains electrical equivalence but operates to -65°C ~ 150°C maximum, reducing the upper thermal limit by 35°C.
SMDJ43A from Alpha & Omega Semiconductor Inc. provides electrical equivalence with peak pulse current of 43.3A (within tolerance) and operates to -55°C ~ 150°C, representing a 10°C reduction in minimum operating temperature.
Enhanced Performance Alternatives
5.0SMDJ43A from Taiwan Semiconductor Corporation and 5.0SMDJ43A-T7 from Littelfuse Inc. exceed the original 3000W specification with 5000W peak pulse power and 72.1A peak pulse current. These parts maintain identical voltage regulation parameters and are suitable for applications requiring additional transient suppression margin. The 5.0SMDJ43A-T7 variant includes AEC-Q101 automotive qualification and operates to -65°C ~ 150°C.
Not Recommended
SMLJ43AE3/TR13 from Microchip Technology is not suitable as a direct substitute due to 300W peak pulse power rating, which is insufficient for the original 3000W specification.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a lower maximum operating temperature than the original 3KASMC43AHM3_A/H?
A: Substitution is permissible only if your application's maximum junction temperature does not exceed the substitute part's rated maximum. The original part is rated to 185°C; most active substitutes are rated to 150°C. Verify your thermal design does not require the extended temperature capability.
Q: What is the difference between the 3000W and 5000W rated parts?
A: The 5000W variants (5.0SMDJ43A and 5.0SMDJ43A-T7) provide higher peak pulse current (72.1A versus 43.2A) and greater energy absorption capacity. These are suitable for applications with more severe transient events but maintain identical voltage regulation characteristics. Use only if your circuit design requires the additional power dissipation capability.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance.
Q: Does package compatibility differ between substitutes?
A: All substitute parts use DO-214AB (SMC) surface mount packaging, identical to the original 3KASMC43AHM3_A/H. PCB footprints and reflow profiles are compatible across all listed alternatives.
Q: Which substitute offers the best compatibility with automotive applications?
A: 3KASMC43AHM3_B/H, TPSMD43A, and 5.0SMDJ43A-T7 carry AEC-Q101 automotive qualification. For non-automotive applications, all active substitutes are acceptable based on electrical equivalence.
Q: Can I interchange SMDJ43A-HR, SMDJ43A-HRA, and SMDJ43A-HRAT7 within the same design?
A: Yes. These three Littelfuse variants are electrically identical with identical voltage, current, and power specifications. The suffix designations indicate different manufacturing or packaging configurations but do not affect electrical performance or compatibility.
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