SMLJ78E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ78E3/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 in the 78V reverse standoff voltage class and features a 139V maximum clamping voltage with 21.6A peak pulse current capability. The part is active in production status and fully compliant with RoHS3 and REACH regulations.

Equivalent and substitute parts are identified based on matching electrical performance parameters within the 78V voltage class, identical package form factors (DO-214AB/SMC), and compatible operating temperature ranges. Substitutes maintain the same unidirectional channel configuration and general-purpose application profile while offering alternative manufacturers and performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	139	V
Current - Peak Pulse (10/1000µs)	21.6	A
Power - Peak Pulse	300	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C (TJ)
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ78E3/TR13 are qualified based on the following substitution criteria:

Electrical Parameters (Primary Matching Criteria):

Reverse standoff voltage: 78V (nominal)
Breakdown voltage minimum: 86.7V
Unidirectional channel configuration: 1 channel
Zener diode type classification
General-purpose application category

Mechanical & Package Parameters (Secondary Matching Criteria):

Package form factor: DO-214AB or SMC equivalent
Mounting type: Surface mount
Tape & Reel packaging availability

Compliance & Environmental Parameters:

RoHS3 compliance status
REACH unaffected classification
Operating temperature range compatibility: minimum -55°C junction temperature

Substitute parts may vary in peak pulse current capability (11.4A to 39.7A), maximum clamping voltage (126V to 139V), and peak pulse power rating (1.5kW to 5kW). These variations are acceptable within the 78V voltage class as they represent different power handling classes while maintaining the same voltage protection threshold and package compatibility.

Parameter Comparison

Parameter	SMLJ78E3/TR13 (Microchip)	5.0SMDJ78A (TSC)	SMCJ78A (MDD)	SMCJ78A-13-F (Diodes Inc.)	SMDJ78A (AOS)
Manufacturer	Microchip Technology	Taiwan Semiconductor Corporation	MDD	Diodes Incorporated	Alpha & Omega Semiconductor Inc.
Voltage - Reverse Standoff (Typ)	78V	78V	78V	78V	78V
Voltage - Breakdown (Min)	86.7V	86.7V	86.7V	86.7V	86.7V
Voltage - Clamping (Max) @ Ipp	139V	126V	126V	126V	126V
Current - Peak Pulse (10/1000µs)	21.6A	39.7A	11.9A	11.4A	23.9A
Power - Peak Pulse	300W	5000W	1500W	1500W	3000W
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-55 to 150°C	-55 to 175°C	-50 to 150°C	-55 to 150°C	-55 to 150°C
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All identified substitute parts maintain active production status and full compliance with RoHS3 and REACH regulations, ensuring regulatory compatibility with the original SMLJ78E3/TR13.

Voltage Class Compatibility: All substitute parts operate within the 78V reverse standoff voltage class with identical 86.7V minimum breakdown voltage. Clamping voltage variations (126V to 139V) remain within acceptable tolerance for the 78V protection class.

Power Handling Considerations: Substitute parts are available across three distinct power classes: 1.5kW (SMCJ78A, SMCJ78A-13-F), 3kW (SMDJ78A), and 5kW (5.0SMDJ78A). Selection depends on application peak pulse current requirements. The original SMLJ78E3/TR13 operates at 300W, making it suitable for lower-current transient suppression applications.

Temperature Range Compatibility: The SMCJ78A (MDD) operates at -50°C minimum junction temperature, which is 5°C higher than the SMLJ78E3/TR13 specification. All other substitutes maintain the -55°C minimum or better. Applications requiring full -55°C operation should select SMCJ78A-13-F (Diodes Incorporated), SMDJ78A (Alpha & Omega), or 5.0SMDJ78A (Taiwan Semiconductor Corporation).

Manufacturer Availability: Multiple manufacturers provide qualified substitutes, ensuring supply chain flexibility. Taiwan Semiconductor Corporation's 5.0SMDJ78A offers the highest power rating (5kW) and extended temperature range (-55 to 175°C).

Frequently Asked Questions (FAQ)

Q: Can SMCJ78A (MDD) be used as a direct replacement for SMLJ78E3/TR13 in all applications?

A: SMCJ78A is electrically compatible within the 78V voltage class and shares the DO-214AB/SMC package. However, it operates at -50°C minimum junction temperature versus -55°C for the original part. Applications requiring full -55°C operation must select an alternative substitute.

Q: What is the difference between the 1.5kW, 3kW, and 5kW power-rated substitutes?

A: Power rating indicates peak pulse power dissipation capability during transient suppression events. Higher power ratings accommodate larger peak pulse currents. The 5.0SMDJ78A (5kW) handles 39.7A peak pulse current, while SMCJ78A variants (1.5kW) handle 11.4–11.9A. Selection depends on the maximum transient current expected in the application circuit.

Q: Are all substitute parts available in Tape & Reel packaging?

A: All identified substitutes are available in Tape & Reel (TR) packaging, maintaining compatibility with automated assembly processes.

Q: Does clamping voltage variation affect substitutability?

A: The SMLJ78E3/TR13 clamps at 139V maximum, while most substitutes clamp at 126V. Both values protect circuits designed for 78V operation. The lower clamping voltage of substitutes provides slightly tighter voltage regulation during transient events. This is acceptable for general-purpose applications where the 78V voltage class is the primary design parameter.

Q: Which substitute offers the best temperature performance?

A: The 5.0SMDJ78A (Taiwan Semiconductor Corporation) provides the widest operating temperature range (-55 to 175°C junction temperature), offering 25°C additional high-temperature capability compared to the original SMLJ78E3/TR13.

Q: Are all substitutes RoHS3 and REACH compliant?

A: All identified substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original SMLJ78E3/TR13.

Q: Can SMDJ78A (Alpha & Omega) replace SMLJ78E3/TR13 in high-reliability applications?

A: SMDJ78A is electrically and mechanically compatible, operates across the full -55 to 150°C temperature range, and maintains RoHS3/REACH compliance. It provides 3kW peak pulse power handling, exceeding the original part's 300W rating. It is suitable for high-reliability applications requiring enhanced transient suppression capability.

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