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SMLJ75AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ75AE3/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 75V reverse standoff voltage and provides 121V maximum clamping voltage with a 24.8A peak pulse current capability. The part is active in production and fully RoHS3 compliant with unlimited moisture sensitivity rating. Equivalent and substitute parts exist from multiple manufacturers offering comparable electrical and mechanical characteristics within the same package family.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Voltage - Reverse Standoff (Typ) | 75V |
| Voltage - Breakdown (Min) | 83.3V |
| Voltage - Clamping (Max) @ Ipp | 121V |
| Current - Peak Pulse (10/1000µs) | 24.8A |
| Power - Peak Pulse | 300W |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| Type | Zener |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitute parts for the SMLJ75AE3/TR13 are grouped based on the following electrical and mechanical compatibility criteria:
Critical Substitution Parameters:
- Voltage - Reverse Standoff (Typ): 75V
- Voltage - Clamping (Max) @ Ipp: 121V
- Voltage - Breakdown (Min): 83.3V
- Unidirectional Channels: 1
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener
- RoHS Status: ROHS3 Compliant
Substitution Categories:
Direct Equivalents (Same Power Rating - 300W): Parts with identical peak pulse power rating of 300W maintain the electrical performance envelope of the original SMLJ75AE3/TR13 with equivalent thermal characteristics.
Functional Equivalents (Enhanced Power Rating - 3000W-5000W): Parts with higher peak pulse power ratings of 3000W or 5000W provide identical voltage clamping and current handling at the rated pulse duration, with enhanced thermal dissipation capability. These components satisfy all electrical requirements of the original specification while offering additional margin.
Limited Power Equivalents (1500W): Parts rated at 1500W meet the voltage clamping and breakdown requirements but with half the peak pulse power rating. These are suitable for applications with lower energy transient demands.
All substitute parts maintain the same operating temperature range or extended range, ensuring compatibility with the original design envelope.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case |
|---|---|---|---|---|---|---|---|---|
| SMLJ75AE3/TR13 | Microchip Technology | 75V | 83.3V | 121V | 24.8A | 300W | -55°C ~ 150°C | DO-214AB, SMC |
| 3SMC75A TR13 PBFREE | Central Semiconductor Corp | 75V | 83.3V | 121V | 24.8A | 3000W | -65°C ~ 150°C | DO-214AB, SMC |
| SMDJ75A | Alpha & Omega Semiconductor Inc. | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C ~ 150°C | DO-214AB, SMC |
| 5.0SMDJ75A | Taiwan Semiconductor Corporation | 75V | 83.3V | 121V | 41.4A | 5000W | -55°C ~ 175°C | DO-214AB, SMC |
| 5.0SMDJ75A-T7 | Littelfuse Inc. | 75V | 83.3V | 121V | 41.4A | 5000W | -65°C ~ 150°C | DO-214AB, SMC |
| SMCJ75A-13-F | Diodes Incorporated | 75V | 83.3V | 121V | 12.4A | 1500W | -55°C ~ 150°C | DO-214AB, SMC |
| SMLJ75A | Bourns Inc. | 75V | 83.3V | 121V | 24.8A | 3000W | -55°C ~ 150°C | DO-214AB, SMC |
Engineering Selection Recommendations
Primary Substitute Candidates:
SMDJ75A (Alpha & Omega Semiconductor Inc.) and SMLJ75A (Bourns Inc.) are recommended as primary substitutes. Both maintain identical electrical specifications to the original SMLJ75AE3/TR13 while providing enhanced 3000W peak pulse power rating compared to the original 300W specification. Both parts are active in production with full RoHS3 compliance.
Extended Temperature Range Option:
5.0SMDJ75A (Taiwan Semiconductor Corporation) extends the maximum operating temperature to 175°C, providing additional thermal margin for applications with elevated ambient or internal heat conditions. This part also features 5000W peak pulse power with 41.4A peak pulse current, exceeding all original specifications while maintaining identical voltage clamping characteristics.
High-Current Alternative:
5.0SMDJ75A-T7 (Littelfuse Inc.) provides the same 5000W power rating and 41.4A peak pulse current as the TSC variant, with operating temperature range of -65°C to 150°C. This part is certified for telecom applications and carries full RoHS3 compliance.
Lower Power Variant:
SMCJ75A-13-F (Diodes Incorporated) maintains identical voltage specifications with 1500W peak pulse power and 12.4A peak pulse current. This variant is suitable for applications with reduced transient energy requirements and provides equivalent overvoltage protection with lower thermal dissipation demands.
Extended Low-Temperature Option:
3SMC75A TR13 PBFREE (Central Semiconductor Corp) extends the minimum operating temperature to -65°C while maintaining 3000W peak pulse power. This part is appropriate for extreme environmental conditions and provides lead-free compliance.
All listed parts maintain the same package and mounting type, ensuring mechanical compatibility without board redesign.
Frequently Asked Questions (FAQ)
Q: Can the SMLJ75AE3/TR13 be replaced with parts having higher peak pulse power ratings?
A: Yes. Parts rated at 3000W or 5000W peak pulse power provide identical voltage clamping and breakdown characteristics while offering enhanced thermal dissipation capability. These substitute parts satisfy all electrical performance requirements and are mechanically compatible with the original footprint.
Q: What is the significance of the 121V clamping voltage specification?
A: The maximum clamping voltage of 121V at peak pulse current (Ipp) defines the voltage protection threshold. All listed substitute parts maintain this identical clamping voltage, ensuring equivalent transient suppression performance.
Q: Are lower power-rated substitutes (1500W) electrically equivalent?
A: Lower power-rated parts such as SMCJ75A-13-F maintain identical voltage specifications (75V standoff, 83.3V breakdown, 121V clamping). These parts are electrically equivalent for voltage suppression but suitable only for applications with reduced transient energy requirements compared to the 300W or higher-rated alternatives.
Q: Do all substitute parts share the same package footprint?
A: Yes. All substitute parts use the DO-214AB/SMC package with surface-mount configuration, ensuring 100% mechanical compatibility without PCB redesign.
Q: What are the compliance and certification implications of selecting substitute parts?
A: All listed substitute parts are RoHS3 compliant and REACH unaffected. Selection should be based on application temperature range, transient energy requirements, and production qualification status within your specific design environment.
Q: How does operating temperature range affect part selection?
A: Operating temperature specifications range from -55°C to 150°C for most substitutes, with some parts offering extended ranges (-65°C to 175°C). Selection should match the thermal envelope of your application.
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