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SMLJ45AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMLJ45AE3/TR13 is an active status transient voltage suppressor (TVS) diode manufactured by Microchip Technology in the DO-214AB surface mount package. This unidirectional Zener diode provides protection against transient voltage events with a 45V reverse standoff voltage and 72.7V clamping voltage at peak pulse current. Finding equivalent substitute parts becomes necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits component standardization across procurement channels.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | Microchip Technology | — |
| Part Number | SMLJ45AE3/TR13 | — |
| Type | Zener TVS Diode | — |
| Voltage - Reverse Standoff (Typ) | 45 | V |
| Voltage - Breakdown (Min) | 50 | V |
| Voltage - Clamping (Max) @ Ipp | 72.7 | V |
| Current - Peak Pulse (10/1000µs) | 41.2 | A |
| Power - Peak Pulse | 300 | W |
| Operating Temperature Range | −55 to 150 | °C |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Product Status | Active | — |
Substitute Part Grouping Explanation
Substitution of the SMLJ45AE3/TR13 is determined by strict equivalence in the following critical electrical parameters: reverse standoff voltage (45V typical), breakdown voltage minimum (50V), clamping voltage maximum at peak pulse current (72.7V), and packaging (DO-214AB/SMC surface mount). Parts meeting these specifications are electrically interchangeable at the functional level.
Substitute parts are grouped into two categories based on peak pulse current and power dissipation characteristics:
Category A – Higher Power Rated Substitutes: Parts with peak pulse current ≥41.2A and power ratings ≥3000W provide enhanced transient handling capacity beyond the original specification while maintaining identical voltage parameters.
Category B – Standard Power Rated Substitutes: Parts with peak pulse current in the range 20.6A to 20.63A and power ratings of 1500W provide functional equivalence for applications where peak pulse current requirements do not exceed these levels.
The key parameters governing substitution eligibility are: voltage specifications (reverse standoff, breakdown, clamping), unidirectional channel count (1), Zener type classification, and surface mount DO-214AB/SMC packaging.
Parameter Comparison
| Manufacturer / Part Number | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package |
|---|---|---|---|---|---|---|---|
| Microchip / SMLJ45AE3/TR13 | 45 | 50 | 72.7 | 41.2 | 300 | −55 to 150 | DO-214AB, SMC |
| Central Semiconductor / 3SMC45A TR13 PBFREE | 45 | 50 | 72.7 | 41.2 | 3000 | −65 to 150 | DO-214AB, SMC |
| Taiwan Semiconductor Corporation / 5.0SMDJ45A | 45 | 50 | 72.7 | 68.8 | 5000 | −55 to 175 | DO-214AB, SMC |
| Littelfuse / 5.0SMDJ45A-T7 | 45 | 50 | 72.7 | 68.8 | 5000 | −65 to 150 | DO-214AB, SMC |
| Meritek / SMCJ45A | 45 | 50 | 72.7 | 20.63 | 1500 | −55 to 150 | DO-214AB, SMC |
| Diodes Incorporated / SMCJ45A-13-F | 45 | 50 | 72.7 | 20.6 | 1500 | −55 to 150 | DO-214AB, SMC |
| Micro Commercial Co / SMCJ45A-TP | 45 | 50 | 72.7 | 20.6 | 1500 | −55 to 175 | DO-214AB, SMC |
| Alpha & Omega Semiconductor / SMDJ45A | 45 | 50 | 72.7 | 41.3 | 3000 | −55 to 150 | DO-214AB, SMC |
| Littelfuse / SMDJ45A-T7 | 45 | 50 | 72.7 | 41.3 | 3000 | −65 to 150 | DO-214AB, SMC |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and ROHS3 compliance, meeting the same regulatory framework as the SMLJ45AE3/TR13. Selection among equivalent parts should be based on application-specific peak pulse current requirements and operating temperature constraints.
For applications requiring peak pulse current handling at or above 41.2A, the Central Semiconductor 3SMC45A TR13 PBFREE, Taiwan Semiconductor Corporation 5.0SMDJ45A, Littelfuse 5.0SMDJ45A-T7, Alpha & Omega Semiconductor SMDJ45A, and Littelfuse SMDJ45A-T7 are direct functional substitutes with matching or superior electrical performance.
For applications with peak pulse current requirements below 41.2A, the Meritek SMCJ45A, Diodes Incorporated SMCJ45A-13-F, and Micro Commercial Co SMCJ45A-TP provide cost-optimized alternatives while maintaining identical voltage specifications.
Components from multiple manufacturers provide supply redundancy. Selection should account for: supplier availability, regional distribution, certification documentation, and procurement lead times specific to the application timeline.
Frequently Asked Questions (FAQ)
Q: What makes a part electrically equivalent to the SMLJ45AE3/TR13? A: Electrical equivalence requires identical specifications in reverse standoff voltage (45V), breakdown voltage minimum (50V), and clamping voltage maximum at peak pulse current (72.7V). All listed substitutes meet these voltage parameters. Peak pulse current and power dissipation ratings may exceed the original specification without affecting functional compatibility.
Q: Can I use a substitute with lower peak pulse current rating? A: Substitutes with peak pulse current ratings below 41.2A (Meritek SMCJ45A, Diodes Incorporated SMCJ45A-13-F, Micro Commercial Co SMCJ45A-TP) are suitable only when the application's actual peak pulse current demand does not exceed the substitute's rated value. Review circuit transient energy requirements before selection.
Q: Are higher power rated substitutes interchangeable without circuit modification? A: Parts with peak pulse current ratings ≥41.2A and power ratings ≥3000W are directly interchangeable with the original SMLJ45AE3/TR13. Higher power ratings indicate enhanced transient handling capability and present no compatibility issues in the same circuit topology.
Q: Do all substitutes share the same package configuration? A: All listed substitutes use the DO-214AB surface mount package (SMC designation). Physical dimensions, pad layouts, and mounting characteristics are consistent across all options, permitting direct board-level substitution without PCB redesign.
Q: How do operating temperature ranges affect part selection? A: The SMLJ45AE3/TR13 operates across −55°C to 150°C. Some substitutes extend this range (Taiwan Semiconductor 5.0SMDJ45A to 175°C maximum; Micro Commercial SMCJ45A-TP to 175°C maximum). Selection should match or exceed the application's ambient temperature requirements. Extended temperature range does not limit compatibility in lower-temperature environments.
Q: Are all substitute parts RoHS compliant? A: All listed substitute parts carry ROHS3 compliance designation, matching the original component's regulatory status and meeting contemporary electronic component procurement standards.
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