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SMLJ20AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ20AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 20V reverse standoff voltage and provides 32.4V clamping at peak pulse current. The part is active in production status and RoHS3 compliant with unlimited moisture sensitivity rating.
Equivalent and substitute parts are identified to address component availability, supply chain requirements, or specific application constraints while maintaining electrical and mechanical compatibility within the DO-214AB/SMC package family.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 20 | V |
| Voltage - Breakdown (Min) | 22.2 | V |
| Voltage - Clamping (Max) @ Ipp | 32.4 | V |
| Current - Peak Pulse (10/1000µs) | 92.6 | A |
| Power - Peak Pulse | 300 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ20AE3/TR13 are classified into two categories based on electrical parameter alignment:
Direct Substitutes maintain identical or equivalent electrical specifications across all critical parameters: 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 32.4V maximum clamping voltage, and 92.6A peak pulse current. These parts are interchangeable in applications where the 300W peak pulse power rating is sufficient.
Similar Substitutes share the same voltage ratings and clamping characteristics but differ in peak pulse current capacity or power dissipation. These parts are suitable for applications where higher current handling or power rating provides design margin, or where lower current ratings are acceptable within circuit constraints.
The substitution logic is based strictly on the following parameters:
- Voltage - Reverse Standoff (Typ): 20V
- Voltage - Breakdown (Min): 22.2V
- Voltage - Clamping (Max) @ Ipp: 32.4V
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package | Qualification |
|---|---|---|---|---|---|---|---|---|---|
| SMLJ20AE3/TR13 | Microchip Technology | 20 | 22.2 | 32.4 | 92.6 | 300 | -55 to 150 | DO-214AB, SMC | — |
| SM30T23AY | STMicroelectronics | 20 | 22.2 | 32.4 | 92.6 | 3000 | -55 to 175 | DO-214AB, SMC | AEC-Q101 |
| SMDJ20A | Alpha & Omega Semiconductor Inc. | 20 | 22.2 | 32.4 | 92.6 | 3000 | -55 to 150 | DO-214AB, SMC | — |
| TPSMD20A | Littelfuse Inc. | 20 | 22.2 | 32.4 | 92.6 | 3000 | -65 to 150 | DO-214AB, SMC | AEC-Q101 |
| 3.0SMCJ20A-13 | Diodes Incorporated | 20 | 22.2 | 32.4 | 62.6 | 3000 | -55 to 175 | DO-214AB, SMC | — |
| 5.0SMDJ20A | Taiwan Semiconductor Corporation | 20 | 22.2 | 32.4 | 155 | 5000 | -55 to 175 | DO-214AB, SMC | — |
| 5.0SMDJ20A-T7 | Littelfuse Inc. | 20 | 22.2 | 32.4 | 155 | 5000 | -65 to 150 | DO-214AB, SMC | — |
| LNBTVS4-222S | STMicroelectronics | 20 | 22 | 30 | 334 | 22500 | -55 to 150 | DO-214AB, SMC | — |
| SMCJ20A | Fairchild Semiconductor | 20 | 22.2 | 32.4 | 46.3 | 1500 | -55 to 150 | DO-214AB, SMC | — |
Engineering Selection Recommendations
Direct Substitutes with Enhanced Specifications:
SM30T23AY (STMicroelectronics) and SMDJ20A (Alpha & Omega Semiconductor Inc.) are direct electrical equivalents with identical voltage and current ratings. Both provide 3000W peak pulse power, exceeding the original 300W specification. SM30T23AY carries AEC-Q101 automotive qualification and operates to 175°C, suitable for automotive and industrial applications. SMDJ20A maintains the -55°C to 150°C operating range of the original part.
TPSMD20A (Littelfuse Inc.) is a direct electrical equivalent with AEC-Q101 qualification and extended lower temperature operation to -65°C, appropriate for telecom and industrial applications requiring automotive-grade reliability.
Similar Substitutes with Reduced Current Rating:
SMCJ20A (Fairchild Semiconductor) provides identical voltage specifications with 46.3A peak pulse current and 1500W power rating. This part is suitable for applications where the lower current capacity is within design requirements.
3.0SMCJ20A-13 (Diodes Incorporated) offers identical voltage specifications with 62.6A peak pulse current and 3000W power rating, with extended temperature operation to 175°C.
Similar Substitutes with Enhanced Current Rating:
5.0SMDJ20A (Taiwan Semiconductor Corporation) and 5.0SMDJ20A-T7 (Littelfuse Inc.) provide 155A peak pulse current and 5000W power rating. These parts are suitable for applications requiring higher transient energy absorption. 5.0SMDJ20A-T7 includes extended lower temperature operation to -65°C.
High-Performance Alternative:
LNBTVS4-222S (STMicroelectronics) differs in clamping voltage (30V vs. 32.4V) and provides significantly higher current capacity (334A) and power rating (22.5kW). This part is suitable for high-energy transient suppression applications where the slightly lower clamping voltage is acceptable.
All substitute parts maintain RoHS3 compliance, DO-214AB/SMC package compatibility, and surface-mount configuration. Selection should be based on application requirements for peak pulse current, power dissipation, operating temperature range, and any required automotive or industrial certifications.
Frequently Asked Questions (FAQ)
Q: Can SMDJ20A be used as a direct replacement for SMLJ20AE3/TR13?
A: Yes. SMDJ20A shares identical voltage ratings (20V standoff, 22.2V breakdown, 32.4V clamping) and peak pulse current (92.6A). The 3000W power rating exceeds the original 300W specification, providing additional design margin. Both parts use the DO-214AB/SMC package and surface-mount configuration.
Q: What is the difference between direct substitutes and similar substitutes?
A: Direct substitutes maintain identical electrical specifications across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current. Similar substitutes share the same voltage ratings but differ in peak pulse current capacity or power dissipation, making them suitable for applications where these differences are acceptable within circuit design constraints.
Q: Is SMCJ20A compatible with the original SMLJ20AE3/TR13?
A: SMCJ20A is compatible from a voltage perspective (20V standoff, 22.2V breakdown, 32.4V clamping) and package standpoint (DO-214AB/SMC). However, it provides only 46.3A peak pulse current compared to the original 92.6A. Compatibility depends on whether the application circuit can operate within the lower current rating.
Q: Can I use 5.0SMDJ20A in place of SMLJ20AE3/TR13?
A: Yes. 5.0SMDJ20A maintains identical voltage specifications and package configuration. It provides 155A peak pulse current and 5000W power rating, both exceeding the original specifications. This part is suitable for applications requiring higher transient energy absorption or where design margin is required.
Q: What does AEC-Q101 qualification mean for TVS diode selection?
A: AEC-Q101 is an automotive industry qualification standard. Parts carrying this qualification (SM30T23AY and TPSMD20A) have undergone rigorous testing for automotive applications. These parts are suitable for automotive, industrial, and mission-critical applications where reliability standards are stringent.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are RoHS3 compliant, matching the compliance status of the original SMLJ20AE3/TR13.
Q: How do operating temperature ranges affect part selection?
A: The original SMLJ20AE3/TR13 operates from -55°C to 150°C. Substitute parts with extended ranges (such as SM30T23AY and 5.0SMDJ20A at -55°C to 175°C, or TPSMD20A and 5.0SMDJ20A-T7 at -65°C to 150°C) provide additional temperature margin for applications in extreme environments. Selection should match application temperature requirements.
Q: What is the significance of peak pulse power rating differences?
A: Peak pulse power rating indicates the maximum transient energy the diode can dissipate. The original part is rated at 300W. Substitute parts with higher ratings (1500W, 3000W, or 5000W) can handle larger transient events without degradation. Selection should be based on the maximum transient energy expected in the application circuit.
Q: Can LNBTVS4-222S replace SMLJ20AE3/TR13?
A: LNBTVS4-222S shares the 20V reverse standoff voltage but differs in clamping voltage (30V vs. 32.4V) and provides significantly higher current capacity (334A) and power rating (22.5kW). Substitution is possible only if the application circuit can tolerate the 30V clamping voltage instead of 32.4V. This part is suitable for high-energy transient suppression where the voltage difference is acceptable.
Q: Does packaging format affect interchangeability?
A: All substitute parts use the DO-214AB/SMC surface-mount package, ensuring mechanical and footprint compatibility with the original SMLJ20AE3/TR13. Packaging format differences (Tape & Reel, Cut Tape, Bulk) affect supply and handling but not electrical interchangeability on the circuit board.
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