SMLJ40AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ40AE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology. This unidirectional surface-mount Zener diode provides transient overvoltage protection in general-purpose applications with a 40V reverse standoff voltage and 64.5V maximum clamping voltage. The component is actively produced and RoHS3 compliant. Substitute parts are necessary to address component availability constraints, extended lead times, or supply chain disruptions while maintaining equivalent electrical and mechanical performance in the circuit.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	46.4	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ40AE3/TR13 are qualified based on the following mandatory electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Breakdown (Min): 44.4V
Voltage - Clamping (Max) @ Ipp: 64.5V
Package / Case: DO-214AB or SMC
Type: Zener, unidirectional
Operating Temperature Range: -55°C minimum and 150°C maximum at junction

Direct substitutes maintain identical ratings across all key electrical parameters and share the same package format. Similar substitutes satisfy the core voltage and package requirements but differ in peak pulse current capacity or power dissipation, suitable for applications where the original design margin permits higher ratings. All substitute parts comply with RoHS3 and maintain equivalent moisture sensitivity levels and supply chain compliance.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Breakdown (V)	Clamping @ Ipp (V)	Peak Pulse Current (A)	Peak Power (W)	Temp Range (°C)	Package	Product Status
SMLJ40AE3/TR13	Microchip Technology	40	44.4	64.5	46.4	300	-55 to 150	DO-214AB	Active
3SMC40A TR13	Central Semiconductor Corp	40	44.4	64.5	46.4	3000	-65 to 150	SMC	Active
SMDJ40A-HR	Littelfuse Inc.	40	44.4	64.5	46.5	3000	-65 to 150	DO-214AB	Active
SMLJ40A	Bourns Inc.	40	44.4	64.5	46.4	3000	-55 to 150	SMC	Active
SMLJ40A-TP	Micro Commercial Co	40	44.4	64.5	46.4	3000	-55 to 175	SMC	Active
5.0SMDJ40A	Taiwan Semiconductor Corporation	40	44.4	64.5	77.6	5000	-55 to 175	SMC	Active
5.0SMDJ40A-T7	Littelfuse Inc.	40	44.4	64.5	77.6	5000	-65 to 150	DO-214AB	Active
SMCJ40A	Meritek	40	44.4	64.5	23.26	1500	-55 to 150	SMC	Active
SMCJ40A-13-F	Diodes Incorporated	40	44.4	64.5	23.2	1500	-55 to 150	SMC	Active

Engineering Selection Recommendations

All listed substitute parts carry Active product status and RoHS3 compliance, meeting current regulatory requirements. The SMLJ40AE3/TR13 operates with a 300W peak pulse rating; direct substitutes with equivalent 46.4A peak pulse current include the 3SMC40A TR13 (3000W), SMLJ40A (3000W), and SMLJ40A-TP (3000W). These parts provide enhanced power dissipation capacity compared to the original specification.

For applications requiring higher current handling at identical voltage parameters, the 5.0SMDJ40A and 5.0SMDJ40A-T7 deliver 77.6A peak pulse current with 5000W peak power dissipation while maintaining the same 40V, 44.4V, and 64.5V voltage ratings. These variants are suitable when circuit protection demands exceed the original design margins.

The SMCJ40A and SMCJ40A-13-F provide reduced peak pulse current (23.2A–23.26A) and 1500W peak power, maintaining voltage equivalence. These are applicable in lower-current transient protection circuits.

Package compatibility requires verification: DO-214AB packages are footprint-compatible with both SMC and DO-214AB designations. Bourns SMLJ40A and Micro Commercial Co SMLJ40A-TP extend maximum junction temperature to 175°C, offering enhanced thermal performance for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher peak power dissipation (3000W instead of 300W)?

A: Yes. All substitute parts maintain identical Voltage - Reverse Standoff, Voltage - Breakdown, and Voltage - Clamping parameters. Higher power ratings indicate enhanced thermal dissipation capacity and do not negatively affect circuit compatibility. The component will operate within design specifications in all applications where the original 300W part was specified.

Q: Are DO-214AB and SMC package designations interchangeable on the PCB?

A: DO-214AB and SMC refer to the same physical surface-mount package format. Components specified as either designation are mechanically and electrically compatible on standard PCB footprints. Verify footprint dimensions with the manufacturer datasheet if transitioning between different packaging sources.

Q: Which substitute provides the closest performance match to the SMLJ40AE3/TR13?

A: The SMLJ40A (Bourns Inc.) and SMLJ40A-TP (Micro Commercial Co) provide identical peak pulse current (46.4A) and clamping voltage (64.5V). The SMLJ40A-TP extends maximum operating temperature to 175°C, offering a performance superset of the original specification.

Q: Can I use the SMCJ40A-13-F (23.2A) instead of the SMLJ40AE3/TR13 (46.4A)?

A: Peak pulse current reduction from 46.4A to 23.2A narrows the circuit protection margin by approximately 50%. Substitution is limited to applications where transient current levels are confirmed below 23.2A. Exceeding this threshold will result in inadequate overvoltage suppression. Original specification peak current should be verified against actual transient stress conditions before accepting reduced-current alternatives.

Q: What is the effect of switching from 40V standoff to a higher voltage rating?

A: All listed substitutes maintain the 40V Voltage - Reverse Standoff specification. This parameter is not adjustable among alternatives. Substitution with different standoff voltages requires circuit re-evaluation and is outside the scope of these equivalent parts.

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