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SMLJ28AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ28AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 28V reverse standoff voltage and provides 45.4V clamping at peak pulse current, with a peak pulse power rating of 300W. The part is active in production status and complies with RoHS3 and REACH regulations.
Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, clamping voltage, peak pulse current, and package type. Alternative sources and higher-rated variants are available to support design flexibility, supply chain continuity, and application-specific performance requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 28 | V |
| Voltage - Breakdown (Min) | 31.1 | V |
| Voltage - Clamping (Max) @ Ipp | 45.4 | V |
| Current - Peak Pulse (10/1000µs) | 66 | A |
| Power - Peak Pulse | 300 | W |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
| Package / Case | DO-214AB, SMC | - |
| Mounting Type | Surface Mount | - |
| Operating Temperature | -55 to 150 | °C (TJ) |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ28AE3/TR13 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:
Critical Matching Parameters:
- Voltage - Reverse Standoff: 28V
- Voltage - Clamping (Max) @ Ipp: 45.4V (or 45V)
- Package / Case: DO-214AB (SMC)
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional
Substitution Categories:
Direct Equivalents maintain identical electrical specifications and are sourced from alternative manufacturers. These parts are interchangeable without circuit modification.
Higher-Rated Variants exceed the original part's peak pulse current and power ratings while maintaining voltage specifications. These parts provide enhanced transient protection capability and are suitable for applications requiring increased surge handling capacity.
Enhanced Performance Alternatives offer superior peak pulse power ratings (5kW and 22.5kW) with significantly higher peak pulse currents, enabling use in high-energy transient environments while preserving voltage regulation characteristics.
All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and REACH compliance status consistent with the original component.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (Max) @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | RoHS Status |
|---|---|---|---|---|---|---|---|
| SMLJ28AE3/TR13 | Microchip Technology | 28 | 45.4 | 66 | 300 | -55 to 150 | ROHS3 Compliant |
| SMLJ28A-TP | Micro Commercial Co | 28 | 45.4 | 66 | 3000 | -55 to 175 | ROHS3 Compliant |
| 3.0SMCJ28A-13 | Diodes Incorporated | 28 | 45.4 | 66.1 | 3000 | -55 to 175 | ROHS3 Compliant |
| 5.0SMDJ28A | Taiwan Semiconductor Corporation | 28 | 45.4 | 110 | 5000 | -55 to 175 | ROHS3 Compliant |
| 5.0SMDJ28A-T7 | Littelfuse Inc. | 28 | 45.4 | 110 | 5000 | -65 to 150 | ROHS3 Compliant |
| LNBTVS4-304S | STMicroelectronics | 28 | 45 | 334 (8/20µs) | 22500 | -55 to 150 | ROHS3 Compliant |
| LNBTVS6-304S | STMicroelectronics | 28 | 45 | 500 (8/20µs) | 22500 | -55 to 150 | ROHS3 Compliant |
| SMCJ28A | Meritek | 28 | 45.4 | 33.04 | 1500 | -55 to 150 | ROHS3 Compliant |
| SMCJ28A-13-F | Diodes Incorporated | 28 | 45.4 | 33 | 1500 | -55 to 150 | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Substitution (Equivalent Performance):
SMLJ28A-TP (Micro Commercial Co) and 3.0SMCJ28A-13 (Diodes Incorporated) are direct functional equivalents with matching voltage specifications and peak pulse current ratings. Both parts are active in production, RoHS3 compliant, and MSL Level 1 rated. SMLJ28A-TP offers extended operating temperature range to 175°C. Selection between these parts depends on supply availability and procurement lead times.
Enhanced Protection (Higher Current Rating):
5.0SMDJ28A (Taiwan Semiconductor Corporation) and 5.0SMDJ28A-T7 (Littelfuse Inc.) provide 110A peak pulse current with 5kW power rating, representing a 67% increase in transient handling capacity. Both maintain 28V standoff and 45.4V clamping specifications. These parts are suitable for applications with higher transient energy requirements. 5.0SMDJ28A-T7 supports extended low-temperature operation to -65°C.
Maximum Protection (Highest Current Rating):
LNBTVS4-304S and LNBTVS6-304S (STMicroelectronics TRANSIL™ series) deliver 334A and 500A peak pulse current respectively with 22.5kW power rating, enabling use in high-energy surge environments. These parts maintain 28V standoff voltage with 45V clamping. Peak pulse current is specified at 8/20µs waveform. Operating temperature range is -55°C to 150°C.
Lower Current Alternative:
SMCJ28A (Meritek) and SMCJ28A-13-F (Diodes Incorporated) provide 33A peak pulse current with 1.5kW power rating. These parts are suitable for applications with lower transient energy requirements and offer cost optimization. Both maintain full voltage specification compatibility.
All substitute parts maintain RoHS3 compliance and REACH compliance status. Selection should be based on application transient energy requirements, thermal environment, and supply chain considerations.
Frequently Asked Questions (FAQ)
Q: Can SMLJ28A-TP be used as a direct replacement for SMLJ28AE3/TR13?
A: Yes. SMLJ28A-TP maintains identical voltage specifications (28V standoff, 45.4V clamping) and peak pulse current (66A). Both are surface-mount DO-214AB (SMC) packages. SMLJ28A-TP offers extended operating temperature to 175°C and higher peak pulse power (3kW vs 300W). The part is RoHS3 compliant and MSL Level 1 rated.
Q: What is the difference between the 300W and 3kW rated parts?
A: Peak pulse power rating indicates the maximum transient energy the device can dissipate during a single surge event. The 300W rating of SMLJ28AE3/TR13 is suitable for lower-energy transient environments. The 3kW variants (SMLJ28A-TP, 3.0SMCJ28A-13) provide 10x greater energy dissipation capacity for applications with higher transient stress. Voltage regulation characteristics remain identical.
Q: Are the LNBTVS series parts compatible with the original circuit design?
A: LNBTVS4-304S and LNBTVS6-304S maintain 28V standoff and 45V clamping specifications, ensuring voltage regulation compatibility. However, peak pulse current is specified at 8/20µs waveform (334A and 500A respectively) rather than 10/1000µs. These parts are suitable for applications requiring maximum transient protection but should be selected based on specific surge waveform characteristics.
Q: What does MSL Level 1 mean for moisture sensitivity?
A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. The component does not require special drying procedures or moisture-barrier packaging. All substitute parts listed maintain MSL Level 1 rating.
Q: Can lower-rated parts like SMCJ28A-13-F be used instead of the original?
A: SMCJ28A-13-F maintains identical voltage specifications and package type but provides only 33A peak pulse current and 1.5kW power rating compared to the original 66A and 300W. This part is suitable only for applications with lower transient energy requirements. Circuit analysis must confirm that reduced surge handling capacity is acceptable.
Q: What is the significance of the operating temperature range difference?
A: SMLJ28AE3/TR13 operates from -55°C to 150°C. Substitute parts offer extended ranges: SMLJ28A-TP and 3.0SMCJ28A-13 extend to 175°C; 5.0SMDJ28A-T7 extends to -65°C. Selection depends on application thermal environment. Extended temperature range provides design margin in extreme conditions but does not affect voltage regulation at standard operating temperatures.
Q: Are all substitute parts available in tape and reel packaging?
A: All listed substitute parts are available in tape and reel (TR) packaging suitable for automated assembly. Packaging specifications are consistent with the original SMLJ28AE3/TR13 component.
Q: Do substitute parts maintain RoHS3 and REACH compliance?
A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original SMLJ28AE3/TR13 component.
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