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SMCJ36 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts
Part Overview
The SMCJ36 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc. in DO-214AB (SMC) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage – Reverse Standoff (Typ) | 36 | V |
| Voltage – Breakdown (Min) | 37.89 | V |
| Voltage – Clamping (Max) @ Ipp | 61.01 | V |
| Current – Peak Pulse (10/1000µs) | 25.9 | A |
| Power – Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SMCJ36 is determined by the following critical parameters:
- Voltage – Reverse Standoff: 36V (all substitutes maintain this specification)
- Package / Case: DO-214AB, SMC or equivalent surface mount package
- Mounting Type: Surface Mount
- RoHS Compliance: ROHS3 Compliant
- Moisture Sensitivity: MSL 1 (Unlimited)
Substitute parts are grouped into two categories based on electrical performance:
Category A – Direct Electrical Equivalents (Clamping Voltage 58.1V): Parts with reduced clamping voltage compared to the original SMCJ36 (61.01V). These include SMCJ36A variants from multiple manufacturers and SMCJ36AE3/TR13. These parts maintain the 36V standoff voltage and 1500W peak pulse power rating while offering lower clamping voltage performance.
Category B – Higher Current Capability (Clamping Voltage 58.1V, Higher Ipp): SMLJ36A and SMLJ36A-TP provide increased peak pulse current (51.6A vs. 25.9A) and 3000W peak pulse power, maintaining the same clamping voltage as Category A but with enhanced transient handling capacity.
Category C – Variant Clamping Voltage (64.3V): SMCJ36E3/TR13 offers higher clamping voltage (64.3V) with reduced peak pulse current (23.3A), suitable for applications requiring higher voltage tolerance.
Parameter Comparison
| Part Number | Manufacturer | Voltage – Reverse Standoff (V) | Voltage – Clamping (Max) @ Ipp (V) | Current – Peak Pulse (A) | Power – Peak Pulse (W) | Package | Operating Temp (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|
| SMCJ36 | Littelfuse Inc. | 36 | 61.01 | 25.9 | 1500 | DO-214AB, SMC | -55 to 150 | Obsolete |
| SMCJ36A | EVVO Semi | 36 | 58.1 | 25.9 | 600 | DO-214AC, SMA | -65 to 150 | Active |
| SZ1SMC36AT3G | Littelfuse Inc. | 36 | 58.1 | 35.8 | 1500 | DO-214AB, SMC | -65 to 150 | Active |
| SMCJ36A-13-F | Diodes Incorporated | 36 | 58.1 | 25.8 | 1500 | DO-214AB, SMC | -55 to 150 | Active |
| SMCJ36A-TP | Micro Commercial Co | 36 | 58.1 | 25.9 | 1500 | DO-214AB, SMC | -55 to 175 | Active |
| SMCJ36AE3/TR13 | Microchip Technology | 36 | 58.1 | 25.8 | 1500 | DO-214AB, SMC | -65 to 150 | Active |
| SMCJ36E3/TR13 | Microchip Technology | 36 | 64.3 | 23.3 | 1500 | DO-214AB, SMC | -65 to 150 | Active |
| SMLJ36A | Bourns Inc. | 36 | 58.1 | 51.6 | 3000 | DO-214AB, SMC | -55 to 150 | Active |
| SMLJ36A-TP | Micro Commercial Co | 36 | 58.1 | 51.6 | 3000 | DO-214AB, SMC | -55 to 175 | Active |
Engineering Selection Recommendations
Primary Recommendation – Direct Package Match with Manufacturer Continuity:
SMCJ36A-13-F (Diodes Incorporated) or SMCJ36AE3/TR13 (Microchip Technology) are preferred direct substitutes. Both maintain DO-214AB SMC package compatibility, 1500W peak pulse power rating, and ROHS3 compliance. SMCJ36AE3/TR13 extends the lower operating temperature limit to -65°C, providing broader thermal range coverage.
Alternative – Littelfuse Manufacturer Continuity with Enhanced Performance:
SZ1SMC36AT3G (Littelfuse Inc.) maintains original manufacturer sourcing while providing AEC-Q101 automotive qualification and increased peak pulse current (35.8A vs. 25.9A). This part is suitable for applications requiring automotive-grade reliability.
High-Current Applications:
SMLJ36A (Bourns Inc.) or SMLJ36A-TP (Micro Commercial Co) provide doubled peak pulse current (51.6A) and doubled peak pulse power (3000W). SMLJ36A-TP extends the upper operating temperature to 175°C. Selection between these depends on thermal and current handling requirements.
Higher Voltage Clamping Requirement:
SMCJ36E3/TR13 (Microchip Technology) offers 64.3V clamping voltage with reduced peak pulse current (23.3A). This variant is suitable for applications requiring higher voltage suppression thresholds.
Package Consideration – SMA Alternative:
SMCJ36A (EVVO Semi) uses DO-214AC SMA package instead of DO-214AB SMC. This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable.
Frequently Asked Questions (FAQ)
Q: Can SMCJ36A (EVVO Semi) be used as a direct replacement for SMCJ36?
A: SMCJ36A maintains electrical specifications (36V standoff, 58.1V clamping, 25.9A peak pulse) but uses DO-214AC SMA package instead of DO-214AB SMC. PCB footprint modification is required. Power rating is reduced to 600W, which may not be suitable for all applications.
Q: What is the difference between SMCJ36AE3/TR13 and SMCJ36A-13-F?
A: Both provide 58.1V clamping voltage and 1500W peak pulse power in DO-214AB SMC package. SMCJ36AE3/TR13 (Microchip) operates from -65°C to 150°C, while SMCJ36A-13-F (Diodes) operates from -55°C to 150°C. Selection depends on lower temperature operating requirements.
Q: When should SMLJ36A be selected over SMCJ36A variants?
A: SMLJ36A provides doubled peak pulse current (51.6A vs. 25.9A) and doubled peak pulse power (3000W vs. 1500W). Selection is based on transient energy absorption requirements. If the application experiences higher energy transients, SMLJ36A provides superior protection capability.
Q: Is SZ1SMC36AT3G suitable for automotive applications?
A: Yes. SZ1SMC36AT3G carries AEC-Q101 automotive qualification and is graded for automotive use. It maintains 36V standoff voltage, 58.1V clamping voltage, and 1500W peak pulse power with enhanced peak pulse current (35.8A).
Q: What is the impact of clamping voltage variation between substitutes?
A: The original SMCJ36 clamps at 61.01V maximum. Most substitutes clamp at 58.1V, providing lower voltage suppression. SMCJ36E3/TR13 clamps at 64.3V, providing higher voltage suppression. Selection depends on circuit voltage tolerance specifications. Lower clamping voltage provides tighter protection; higher clamping voltage allows greater voltage excursion.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMCJ36 environmental specifications.
Q: Can SMCJ36A-TP be used in high-temperature applications?
A: Yes. SMCJ36A-TP operates to 175°C junction temperature, exceeding the original SMCJ36 specification of 150°C. This extended temperature range is suitable for high-temperature circuit environments.
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