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SMLJ45CA-TP Equivalent & Substitute Parts
Part Overview
The SMLJ45CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates at a 45V reverse standoff voltage with a 72.7V maximum clamping voltage and 41.2A peak pulse current capability. The component is actively produced, RoHS3 compliant, and widely stocked. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical 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) | 41.2 | A |
| Power - Peak Pulse | 3000 | W |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -55 to 175 | °C |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ45CA-TP are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following core parameters: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage, DO-214AB (SMC) package, surface-mount configuration, and Zener diode type with single bidirectional channel. Substitutes are differentiated by peak pulse current rating (20.6A to 68.8A), peak pulse power dissipation (1.5kW to 5kW), operating temperature range variations, and manufacturer identity. Parts with identical electrical specifications but different manufacturers or packaging formats (Tape & Reel versus Cut Tape) are considered direct equivalents. Parts with higher current and power ratings provide enhanced protection margins and are suitable for applications with greater transient stress. Parts with lower current ratings require verification that circuit peak pulse current demands do not exceed component specifications.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package | Packaging Type |
|---|---|---|---|---|---|---|---|---|
| SMLJ45CA-TP | Micro Commercial Co | 45 | 72.7 | 41.2 | 3000 | -55 to 175 | DO-214AB, SMC | Tape & Reel |
| 5.0SMDJ45CA | MDE Semiconductor Inc | 45 | 72.7 | 68.8 | 5000 | -55 to 150 | DO-214AB, SMC | Tape & Reel |
| 5.0SMDJ45CA-T7 | Littelfuse Inc. | 45 | 72.7 | 68.8 | 5000 | -65 to 150 | DO-214AB, SMC | Tape & Reel |
| SMC3K45CA-M3/57 | Vishay General Semiconductor - Diodes Division | 45 | 72.7 | 41.3 | 3000 | -55 to 150 | DO-214AB, SMC | Cut Tape |
| SMCJ45CA | MDD | 45 | 72.7 | 20.6 | 1500 | -50 to 150 | DO-214AB, SMC | Tape & Reel |
| SMCJ45CA-13-F | Diodes Incorporated | 45 | 72.7 | 20.6 | 1500 | -55 to 150 | DO-214AB, SMC | Cut Tape & Digi-Reel |
| SMDJ45CA | Alpha & Omega Semiconductor Inc. | 45 | 72.7 | 41.3 | 3000 | -55 to 150 | DO-214AB, SMC | Tape & Reel |
| SMLJ45CA | Bourns Inc. | 45 | 72.7 | 41.2 | 3000 | -55 to 150 | DO-214AB, SMC | Tape & Reel |
Engineering Selection Recommendations
Selection among substitute parts depends on application-specific requirements and compliance constraints. Parts with 41.2A to 41.3A peak pulse current (SMLJ45CA-TP, SMC3K45CA-M3/57, SMDJ45CA, SMLJ45CA) provide equivalent protection performance and are suitable for standard transient suppression applications. Parts with 68.8A peak pulse current (5.0SMDJ45CA, 5.0SMDJ45CA-T7) offer enhanced current handling and 5kW peak power dissipation, appropriate for high-stress environments. Parts with 20.6A peak pulse current (SMCJ45CA, SMCJ45CA-13-F) are suitable only for applications with lower transient stress levels.
All listed substitutes maintain RoHS3 compliance and EAR99 export classification. Operating temperature range varies: SMLJ45CA-TP supports -55°C to 175°C, while most substitutes operate to -55°C or -65°C minimum with 150°C maximum. Applications requiring the full 175°C upper temperature limit are restricted to SMLJ45CA-TP. Packaging format (Tape & Reel versus Cut Tape) affects procurement and assembly logistics but does not alter electrical performance. Vishay TransZorb series (SMC3K45CA-M3/57) and Bourns SMLJ series (SMLJ45CA) are established product lines with extended market availability.
Frequently Asked Questions (FAQ)
Q: Can SMCJ45CA or SMCJ45CA-13-F be used as direct replacements for SMLJ45CA-TP?
A: SMCJ45CA and SMCJ45CA-13-F are electrically compatible in voltage parameters but have reduced peak pulse current (20.6A versus 41.2A) and power dissipation (1.5kW versus 3kW). These parts are suitable only if circuit peak pulse current does not exceed 20.6A. Verify transient stress levels before substitution.
Q: What is the difference between 5.0SMDJ45CA and 5.0SMDJ45CA-T7?
A: Both parts share identical electrical specifications (68.8A peak pulse current, 5kW power dissipation, 72.7V clamping voltage). The primary difference is operating temperature range: 5.0SMDJ45CA operates -55°C to 150°C, while 5.0SMDJ45CA-T7 extends to -65°C minimum. Select 5.0SMDJ45CA-T7 for applications requiring lower temperature operation.
Q: Is the SMLJ45CA-TP upper temperature limit of 175°C critical for my application?
A: The 175°C maximum junction temperature of SMLJ45CA-TP exceeds most substitute parts, which limit to 150°C. If your application requires sustained operation above 150°C junction temperature, SMLJ45CA-TP is the only listed option. For standard applications with junction temperatures below 150°C, substitutes are acceptable.
Q: Can I substitute a higher-current part (68.8A) for a lower-current requirement?
A: Yes. Parts with higher peak pulse current ratings (5.0SMDJ45CA, 5.0SMDJ45CA-T7 at 68.8A) provide additional protection margin and are suitable for applications originally specified for 41.2A or lower. No performance degradation occurs; however, verify that board layout and thermal management accommodate the higher power dissipation (5kW versus 3kW).
Q: What packaging format should I select: Tape & Reel or Cut Tape?
A: Tape & Reel packaging is standard for high-volume automated assembly. Cut Tape and Digi-Reel formats are suitable for lower-volume or manual assembly processes. Electrical performance is identical; selection depends on assembly equipment and procurement volume requirements.
Q: Are all listed parts RoHS3 compliant?
A: Yes. All substitute parts listed carry RoHS3 compliance certification. SMLJ45CA (Bourns) is marked REACH Affected; all other parts are REACH Unaffected. Verify REACH compliance requirements for your specific application and supply chain.
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