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SMCJ45CA-TP Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMCJ45CA-TP is a bidirectional Zener transient voltage suppressor diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 45V reverse standoff voltage with a 72.7V maximum clamping voltage and 20.6A peak pulse current capability in a DO-214AB (SMC) package. The part is Active status and RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).
Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers offering identical or functionally compatible specifications within the same electrical and mechanical parameters.
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 |
| Operating Temperature Range | -55 to 175 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the SMCJ45CA-TP is determined by strict equivalence across the following critical electrical parameters: Voltage - Reverse Standoff (45V), Voltage - Breakdown (50V minimum), Voltage - Clamping (72.7V maximum), and mechanical compatibility with DO-214AB (SMC) surface-mount package.
Parts are classified into two categories:
Direct Equivalents maintain identical electrical specifications including Current - Peak Pulse (20.6A) and Power - Peak Pulse (1500W), with variations only in manufacturer, packaging format (Tape & Reel variants), or minor temperature range differences that do not affect functional performance.
Functional Alternatives share the same voltage parameters and package but feature higher current-handling capability (41.2A to 68.8A peak pulse) and correspondingly higher power dissipation (3000W to 5000W). These parts provide enhanced transient protection margin and are suitable for applications where the original specification represents a minimum requirement rather than a design ceiling.
Parameter Comparison
| 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 |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ45CA-TP | Micro Commercial Co | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 175 | DO-214AB, SMC | ROHS3 Compliant |
| SMCJ45CA | MDD | 45 | 50 | 72.7 | 20.6 | 1500 | -50 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| SMCJ45CA-13-F | Diodes Incorporated | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| SMCJ45CA-E3/57T | Vishay General Semiconductor - Diodes Division | 45 | 50 | 72.7 | 20.6 | 1500 | -55 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| 5.0SMDJ45CA | MDE Semiconductor Inc | 45 | 50 | 72.7 | 68.8 | 5000 | -55 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| 5.0SMDJ45CA-T7 | Littelfuse Inc. | 45 | 50 | 72.7 | 68.8 | 5000 | -65 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| SMDJ45CA | Alpha & Omega Semiconductor Inc. | 45 | 50 | 72.7 | 41.3 | 3000 | -55 to 150 | DO-214AB, SMC | ROHS3 Compliant |
| SMLJ45CA | Bourns Inc. | 45 | 50 | 72.7 | 41.2 | 3000 | -55 to 150 | DO-214AB, SMC | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Identical Electrical Specifications):
SMCJ45CA-13-F (Diodes Incorporated) and SMCJ45CA-E3/57T (Vishay General Semiconductor - Diodes Division) are direct electrical equivalents with matching 20.6A peak pulse current and 1500W power dissipation. Both maintain RoHS3 compliance and Active product status. SMCJ45CA (MDD) provides identical electrical performance with a narrower operating temperature range (-50°C to 150°C versus -55°C to 175°C), suitable for applications not requiring extended low-temperature operation.
Functional Alternatives (Enhanced Current Capability):
SMDJ45CA (Alpha & Omega Semiconductor Inc.) and SMLJ45CA (Bourns Inc.) provide 41.2A to 41.3A peak pulse current with 3000W power dissipation, representing a 2× improvement over the base specification. These parts maintain identical voltage parameters and package compatibility while offering increased transient protection margin.
5.0SMDJ45CA (MDE Semiconductor Inc.) and 5.0SMDJ45CA-T7 (Littelfuse Inc.) deliver 68.8A peak pulse current with 5000W power dissipation, providing 3.3× current capability enhancement. The 5.0SMDJ45CA-T7 variant extends the lower operating temperature limit to -65°C.
All substitute parts maintain RoHS3 compliance, Active product status, and DO-214AB (SMC) surface-mount package compatibility with the original SMCJ45CA-TP specification.
Frequently Asked Questions (FAQ)
Q: Can SMCJ45CA (MDD) replace SMCJ45CA-TP in all applications?
A: SMCJ45CA provides identical electrical performance with a reduced operating temperature range (-50°C to 150°C versus -55°C to 175°C). Substitution is valid for applications operating within the narrower temperature window. For designs requiring the full -55°C to 175°C range, SMCJ45CA-13-F or SMCJ45CA-E3/57T are preferred.
Q: What is the difference between direct equivalents and functional alternatives?
A: Direct equivalents (SMCJ45CA-13-F, SMCJ45CA-E3/57T, SMCJ45CA) maintain the 20.6A peak pulse current specification. Functional alternatives (SMDJ45CA, SMLJ45CA, 5.0SMDJ45CA series) feature higher current ratings (41.2A to 68.8A) and power dissipation (3000W to 5000W), providing enhanced protection margin. Both categories share identical voltage parameters and package compatibility.
Q: Are all substitute parts compatible with the DO-214AB (SMC) footprint?
A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical and electrical compatibility with the original SMCJ45CA-TP PCB layout without modification.
Q: Which substitute part offers the best low-temperature performance?
A: 5.0SMDJ45CA-T7 (Littelfuse Inc.) extends the operating temperature range to -65°C, providing the lowest minimum temperature specification among all listed alternatives.
Q: Can higher-current alternatives (SMDJ45CA, SMLJ45CA, 5.0SMDJ45CA series) be used as direct drop-in replacements?
A: Yes. Higher-current alternatives maintain identical voltage specifications (45V reverse standoff, 72.7V clamping) and package compatibility. The increased current and power ratings provide enhanced transient suppression without affecting circuit operation. No design modification is required.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts listed maintain RoHS3 compliance, REACH Unaffected or REACH Affected status, and EAR99 export classification. Moisture Sensitivity Level (MSL) is rated at 1 (Unlimited) for all parts except where not specified.
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