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1SMC75AT3 Equivalent & Substitute Parts
Part Overview
The 1SMC75AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 75V reverse standoff voltage with a 121V maximum clamping voltage and 12.4A peak pulse current capability in a DO-214AB (SMC) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 75 | V |
| Voltage - Breakdown (Min) | 83.3 | V |
| Voltage - Clamping (Max) @ Ipp | 121 | V |
| Current - Peak Pulse (10/1000µs) | 12.4 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitute parts for the 1SMC75AT3 are classified into two categories based on electrical parameter alignment:
Direct Substitutes (Identical Electrical Parameters): Parts meeting all key electrical specifications: 75V reverse standoff, 83.3V minimum breakdown, 121V maximum clamping voltage, and 12.4A peak pulse current. These parts maintain the same 1500W peak pulse power rating and are packaged in DO-214AB (SMC) format. Direct substitutes include 1SMC75A TR13 PBFREE, SMCJ75A (Meritek), SMCJ75A-13-F (Diodes Incorporated), SMCJ75A-HR (Littelfuse), and SMCJ75A-HRA (Littelfuse Inc.).
Similar Substitutes (Higher Power Rating): Parts with identical voltage parameters (75V standoff, 83.3V breakdown, 121V clamping) but elevated current and power ratings: 5.0SMDJ75A and 5.0SMDJ75A-T7 provide 41.4A peak pulse current and 5000W peak pulse power. These are suitable for applications requiring higher transient energy dissipation while maintaining the same voltage protection threshold.
Related Substitutes (Different Voltage Class): SM15T100A operates at a higher voltage class (85.5V standoff, 95V breakdown, 178V clamping) with 56A peak pulse current. This part is included for reference in applications requiring higher voltage protection but is not a direct electrical substitute.
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Voltage (V) | Clamping Voltage (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Operating Temp (°C) | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1SMC75AT3 | onsemi | 75 | 83.3 | 121 | 12.4 | 1500 | -65 to 150 | DO-214AB (SMC) | Obsolete | Non-compliant |
| 1SMC75A TR13 PBFREE | Central Semiconductor Corp | 75 | 83.3 | 121 | 12.4 | 1500 | -65 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| SMCJ75A | Meritek | 75 | 83.3 | 121 | 12.4 | 1500 | -55 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| SMCJ75A-13-F | Diodes Incorporated | 75 | 83.3 | 121 | 12.4 | 1500 | -55 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| SMCJ75A-HR | Littelfuse | 75 | 83.3 | 121 | 12.4 | 1500 | -65 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| SMCJ75A-HRA | Littelfuse Inc. | 75 | 83.3 | 121 | 12.4 | 1500 | -65 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| 5.0SMDJ75A | Taiwan Semiconductor Corporation | 75 | 83.3 | 121 | 41.4 | 5000 | -55 to 175 | DO-214AB (SMC) | Active | ROHS3 Compliant |
| 5.0SMDJ75A-T7 | Littelfuse Inc. | 75 | 83.3 | 121 | 41.4 | 5000 | -65 to 150 | DO-214AB (SMC) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical and Thermal Performance):
1SMC75A TR13 PBFREE (Central Semiconductor Corp) is the primary direct substitute. It maintains all electrical parameters of the original 1SMC75AT3 while offering active product status and ROHS3 compliance. The tape and reel packaging supports automated assembly processes.
SMCJ75A-HR and SMCJ75A-HRA (both Littelfuse) provide direct electrical equivalence with extended temperature range support (-65°C to 150°C), matching the original part's thermal envelope. Both are ROHS3 compliant and actively manufactured.
SMCJ75A (Meritek) and SMCJ75A-13-F (Diodes Incorporated) offer direct electrical substitution with active product status and ROHS3 compliance. Operating temperature range is -55°C to 150°C, which is acceptable for most general-purpose applications but does not extend to the original part's lower temperature limit.
For Higher Transient Energy Applications:
5.0SMDJ75A (Taiwan Semiconductor Corporation) and 5.0SMDJ75A-T7 (Littelfuse Inc.) maintain identical voltage protection parameters while providing 41.4A peak pulse current and 5000W peak pulse power—3.3 times the energy dissipation capability of the original part. These are suitable for circuits requiring enhanced transient suppression without changing the voltage protection threshold. Both are ROHS3 compliant and actively produced.
Compliance Considerations:
All recommended direct substitutes are ROHS3 compliant, addressing environmental and regulatory requirements that the obsolete 1SMC75AT3 does not meet. All parts maintain the DO-214AB (SMC) package format, ensuring mechanical and thermal compatibility with existing PCB layouts.
Frequently Asked Questions (FAQ)
Q: Can SMCJ75A directly replace 1SMC75AT3 in existing designs?
A: Yes. SMCJ75A maintains all critical electrical parameters: 75V standoff voltage, 83.3V breakdown voltage, 121V clamping voltage, and 12.4A peak pulse current. The DO-214AB (SMC) package is mechanically and thermally identical. The operating temperature range is -55°C to 150°C versus the original -65°C to 150°C; verify that your application does not require operation below -55°C.
Q: What is the difference between direct substitutes and higher-power alternatives?
A: Direct substitutes (1SMC75A TR13 PBFREE, SMCJ75A, SMCJ75A-13-F, SMCJ75A-HR, SMCJ75A-HRA) provide identical electrical performance at 12.4A and 1500W. Higher-power alternatives (5.0SMDJ75A, 5.0SMDJ75A-T7) maintain the same voltage protection but deliver 41.4A and 5000W, suitable for circuits with larger transient energy events.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All recommended direct and higher-power substitutes are ROHS3 compliant. The original 1SMC75AT3 is RoHS non-compliant, making these alternatives necessary for new designs and regulatory compliance.
Q: Does packaging format affect substitution?
A: All direct substitutes use the DO-214AB (SMC) package. Packaging variants (tape and reel, cut tape, bulk) do not affect electrical performance or PCB footprint compatibility. Select packaging based on assembly process requirements.
Q: Can I use SMCJ75A-HR instead of SMCJ75A?
A: Yes. Both parts are electrically identical with 75V standoff, 83.3V breakdown, 121V clamping, and 12.4A peak pulse current. SMCJ75A-HR is manufactured by Littelfuse with extended temperature range (-65°C to 150°C) and is ROHS3 compliant. Selection depends on supplier availability and procurement lead times.
Q: What should I verify before switching to a higher-power substitute like 5.0SMDJ75A?
A: Verify that your PCB thermal design can accommodate the higher power dissipation (5000W versus 1500W). The DO-214AB package remains the same, but thermal management requirements may differ. Confirm that the higher current rating (41.4A) does not introduce unintended circuit behavior in your specific application topology.
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