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SMCJ45A-TP Transient Voltage Suppressor Diode - Equivalent & Substitute Parts
Part Overview
The SMCJ45A-TP is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 45V reverse standoff voltage with 72.7V maximum clamping voltage and 20.6A peak pulse current capability in a DO-214AB (SMC) package. This component is actively produced and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support procurement flexibility and supply chain continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 45 | V |
| Voltage - Breakdown (Min) | 50 | V |
| Voltage - Clamping (Max) @ Ipp | 72.7 | V |
| Current - Peak Pulse (10/1000µs) | 20.6 | A |
| Power - Peak Pulse | 1500 | W |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -55 to 175 | °C |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts are classified into two categories based on electrical parameter alignment:
Direct Substitutes maintain identical electrical specifications: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, and 20.6A peak pulse current at 1500W peak pulse power. These parts are interchangeable without circuit redesign and include SMCJ45A-13-F (Diodes Incorporated), 1SMC45A TR13 PBFREE (Central Semiconductor Corp), SMCJ45A (Meritek), and SMCJ45A-E3/57T (Vishay General Semiconductor).
Similar Substitutes share the same voltage parameters (45V standoff, 50V breakdown, 72.7V clamping) but feature higher peak pulse current ratings and power dissipation capabilities. These include 5.0SMDJ45A-T7 (Littelfuse Inc., 68.8A / 5000W), 5.0SMDJ45A (Taiwan Semiconductor Corporation, 68.8A / 5000W), and SMDJ45A-T7 (Littelfuse Inc., 41.3A / 3000W). Similar substitutes provide enhanced transient protection margins and are suitable for applications requiring higher energy absorption without altering the protection threshold voltage.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ45A-TP | Micro Commercial Co | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 175 | DO-214AB, SMC | ROHS3 |
| SMCJ45A-13-F | Diodes Incorporated | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| 1SMC45A TR13 PBFREE | Central Semiconductor Corp | 45 | 50 | 72.7 | 20.6 | 1500 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| SMCJ45A | Meritek | 45 | 50 | 72.7 | 20.63 | 1500 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| SMCJ45A-E3/57T | Vishay General Semiconductor | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| 5.0SMDJ45A-T7 | Littelfuse Inc. | 45 | 50 | 72.7 | 68.8 | 5000 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| 5.0SMDJ45A | Taiwan Semiconductor Corporation | 45 | 50 | 72.7 | 68.8 | 5000 | -55 to 175 | DO-214AB, SMC | ROHS3 |
| SMDJ45A-T7 | Littelfuse Inc. | 45 | 50 | 72.7 | 41.3 | 3000 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| SMDJ45A | Alpha & Omega Semiconductor Inc. | 45 | 50 | 72.7 | 41.3 | 3000 | -55 to 150 | DO-214AB, SMC | ROHS3 |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the SMCJ45A-TP. Direct substitutes (SMCJ45A-13-F, 1SMC45A TR13 PBFREE, SMCJ45A, SMCJ45A-E3/57T) are electrically and mechanically interchangeable with identical 1500W peak pulse power ratings and 20.6A peak pulse current specifications. These are suitable for direct replacement in existing designs without circuit modification.
Similar substitutes with higher power ratings (5.0SMDJ45A-T7 at 5000W, SMDJ45A-T7 at 3000W) provide increased transient energy absorption while maintaining the same voltage protection thresholds. Selection between direct and similar substitutes depends on application transient energy requirements. All parts are available in DO-214AB (SMC) surface-mount package format with unlimited moisture sensitivity level (MSL 1).
Temperature range considerations: The SMCJ45A-TP operates to 175°C maximum junction temperature. Substitutes from Littelfuse (5.0SMDJ45A-T7, SMDJ45A-T7) and Central Semiconductor (1SMC45A TR13 PBFREE) are rated to 150°C maximum, suitable for applications with lower thermal margins. Taiwan Semiconductor's 5.0SMDJ45A matches the 175°C upper temperature limit of the original part.
Frequently Asked Questions (FAQ)
Q: Can SMCJ45A-13-F be used as a direct replacement for SMCJ45A-TP?
A: Yes. Both parts share identical electrical specifications: 45V reverse standoff, 72.7V clamping voltage, 20.6A peak pulse current, and 1500W peak pulse power. Both are packaged in DO-214AB (SMC) and ROHS3 compliant. The primary difference is the maximum operating temperature: SMCJ45A-TP reaches 175°C while SMCJ45A-13-F is rated to 150°C. For applications operating below 150°C junction temperature, direct substitution is valid.
Q: What is the difference between direct substitutes and similar substitutes?
A: Direct substitutes maintain identical peak pulse current (20.6A) and power dissipation (1500W) ratings. Similar substitutes share the same voltage protection parameters but feature higher current and power ratings: SMDJ45A variants provide 41.3A / 3000W, and 5.0SMDJ45A variants provide 68.8A / 5000W. Similar substitutes are used when the application experiences higher transient energy levels while maintaining the same protection voltage threshold.
Q: Are all substitute parts available in the same package as SMCJ45A-TP?
A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical and thermal compatibility with existing PCB layouts. Packaging format (Tape & Reel or Cut Tape) may vary by manufacturer and supplier, but the component footprint and mounting characteristics remain identical.
Q: Which substitute part has the widest operating temperature range?
A: Both SMCJ45A-TP and 5.0SMDJ45A operate across -55°C to 175°C junction temperature range, providing the widest thermal operating window. Other substitutes are limited to -55°C to 150°C or -65°C to 150°C maximum, depending on manufacturer specifications.
Q: Can SMDJ45A-T7 replace SMCJ45A-TP in a cost-sensitive application?
A: SMDJ45A-T7 provides 3000W peak pulse power versus the original 1500W specification. This higher rating increases component cost but offers enhanced transient protection margin. Substitution is valid if the application can accommodate the higher power rating without thermal or circuit design changes. Verify that the higher current capability (41.3A versus 20.6A) does not affect circuit performance.
Q: What compliance certifications apply to all substitute parts?
A: All listed parts are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations. All parts carry ECCN EAR99 classification and HTSUS code 8541.10.0080 for tariff purposes. Moisture sensitivity level is MSL 1 (unlimited) across all parts, indicating no special moisture control requirements during storage or handling.
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