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SMLJ43AE3/TR13 Transient Voltage Suppressor Equivalent & Substitute Parts
Part Overview
The SMLJ43AE3/TR13 is an active-status transient voltage suppressor (TVS) diode manufactured by Microchip Technology. This unidirectional Zener-type device operates in the 43V reverse standoff voltage class with a 69.4V maximum clamping voltage at peak pulse current. The component is packaged in the DO-214AB (SMC) surface mount configuration and meets ROHS3 compliance with unlimited moisture sensitivity rating. Substitute parts are required when addressing specific application requirements including enhanced power dissipation capabilities, extended temperature ranges, automotive qualification, or alternative manufacturer sourcing for supply chain optimization.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 43 | V |
| Voltage - Breakdown (Min) | 47.8 | V |
| Voltage - Clamping (Max) @ Ipp | 69.4 | V |
| Current - Peak Pulse (10/1000µs) | 43.2 | A |
| Power - Peak Pulse | 300 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | - |
| Type | Zener, Unidirectional | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitution eligibility for the SMLJ43AE3/TR13 is determined by the following key parameters: reverse standoff voltage (43V nominal), breakdown voltage minimum (47.8V), clamping voltage maximum at peak pulse current (69.4V), unidirectional channel configuration (single channel), zener type classification, surface mount mounting type, DO-214AB/SMC packaging, and ROHS3 compliance.
Substitute parts are categorized into two groupings:
Direct Equivalents: Parts maintaining identical or functionally equivalent voltage ratings, current handling, and power dissipation within the same packaging standard. These parts satisfy core circuit protection requirements without modification to design parameters.
Higher Power/Enhanced Performance Variants: Parts with identical voltage characteristics but elevated power dissipation ratings (3000W, 5000W) and/or extended operating temperature ranges. These variants provide additional margin for thermal management or extended environmental operation while maintaining electrical equivalence in the primary voltage protection function.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Power - Peak Pulse (W) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMLJ43AE3/TR13 | Microchip Technology | 43 | 47.8 | 69.4 | 43.2 | 300 | -55 to 150 | DO-214AB, SMC |
| 3SMC43A TR13 PBFREE | Central Semiconductor Corp | 43 | 47.8 | 69.4 | 43.2 | 3000 | -65 to 150 | DO-214AB, SMC |
| SMDJ43A | Alpha & Omega Semiconductor Inc. | 43 | 47.8 | 69.4 | 43.3 | 3000 | -55 to 150 | DO-214AB, SMC |
| TPSMD43A | Littelfuse Inc. | 43 | 47.8 | 69.4 | 43.2 | 3000 | -65 to 150 | DO-214AB, SMC |
| 5.0SMDJ43A | Taiwan Semiconductor Corporation | 43 | 47.8 | 69.4 | 72.1 | 5000 | -55 to 175 | DO-214AB, SMC |
| 5.0SMDJ43A-T7 | Littelfuse Inc. | 43 | 47.8 | 69.4 | 72.1 | 5000 | -65 to 150 | DO-214AB, SMC |
| SMCJ43A-13-F | Diodes Incorporated | 43 | 47.8 | 69.4 | 21.6 | 1500 | -55 to 150 | DO-214AB, SMC |
| SMCJ43A-TP | Micro Commercial Co | 43 | 47.8 | 69.4 | 21.7 | 1500 | -55 to 175 | DO-214AB, SMC |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and ROHS3 compliance, qualifying them for standard electronics manufacturing environments. Selection among equivalent options depends on supply chain availability and inventory levels.
For applications requiring standard power dissipation (300W nominal): The SMLJ43AE3/TR13 and SMCJ43A-13-F or SMCJ43A-TP provide functional equivalence with 1500W peak pulse capability. The SMCJ43A-TP variant extends operating temperature to 175°C.
For applications requiring enhanced thermal margin (3000W peak pulse): The 3SMC43A TR13 PBFREE (Central Semiconductor), SMDJ43A (Alpha & Omega), and TPSMD43A (Littelfuse) provide 10x power rating increase. The TPSMD43A carries AEC-Q101 automotive qualification with extended temperature range (-65 to 150°C).
For applications requiring maximum power dissipation and temperature margin (5000W peak pulse): The 5.0SMDJ43A (Taiwan Semiconductor) and 5.0SMDJ43A-T7 (Littelfuse) are specified. The 5.0SMDJ43A operates to 175°C junction temperature. The 5.0SMDJ43A-T7 extends lower temperature limit to -65°C with MSL 1 rating.
All substitute parts maintain identical voltage protection characteristics (43V standoff, 47.8V minimum breakdown, 69.4V maximum clamping) and unidirectional zener configuration. Component selection based on thermal requirements, certification needs, and supply availability.
Frequently Asked Questions (FAQ)
Q: Can SMCJ43A-13-F or SMCJ43A-TP directly replace the SMLJ43AE3/TR13?
A: Yes. Both parts maintain the 43V reverse standoff voltage, 69.4V clamping voltage, and DO-214AB/SMC packaging. The SMCJ43A variants are rated for 1500W peak pulse versus the SMLJ43AE3/TR13 at 300W. This higher rating provides additional thermal margin in protection circuits without affecting voltage suppression function.
Q: What is the difference between the SMDJ43A and SMCJ43A variants?
A: Both maintain identical voltage ratings (43V standoff, 69.4V clamping). The SMDJ43A is manufactured by Alpha & Omega Semiconductor with 3000W peak pulse rating and -55 to 150°C operating range. The SMCJ43A variants are supplied by multiple manufacturers (MDD, Diodes Incorporated, Micro Commercial Co) with 1500W peak pulse ratings. Selection depends on required power dissipation margin and manufacturer preference.
Q: Can the 5.0SMDJ43A series replace the standard SMLJ43AE3/TR13?
A: Yes, with design margin consideration. The 5.0SMDJ43A series (both standard and T7 variants) maintain identical voltage characteristics but specify 72.1A peak pulse current versus 43.2A in the original part, with 5000W power rating. These variants are suitable for applications requiring extended temperature operation or higher transient current handling. Mechanical fit and thermal dissipation design remain equivalent due to identical DO-214AB/SMC packaging.
Q: Does the TPSMD43A automotive qualification affect its substitution suitability?
A: The TPSMD43A AEC-Q101 qualification indicates automotive-grade manufacturing and testing but does not alter electrical substitution compatibility. Voltage and current ratings remain identical to the SMLJ43AE3/TR13. The automotive qualification may be required for specific end-use applications but does not restrict use in non-automotive circuits.
Q: What is the significance of the extended temperature range in 5.0SMDJ43A-T7?
A: The 5.0SMDJ43A-T7 specifies -65 to 150°C junction temperature operation versus the -55 to 150°C range of the SMLJ43AE3/TR13. The extended lower temperature limit (additional 10°C) may be required for applications in extreme cold environments. The MSL 1 rating (unlimited moisture sensitivity) is maintained, supporting standard board assembly and storage conditions.
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