SMLJ78CA-TP Equivalent & Substitute Parts

Part Overview

The SMLJ78CA-TP is a Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates at 78V reverse standoff with a 126V maximum clamping voltage and 22.8A peak pulse current capability. The component is RoHS3 compliant, active in production status, and packaged in DO-214AB (SMC) format for tape and reel distribution. Equivalent and substitute parts are identified based on matching electrical parameters, package compatibility, and operational specifications to ensure functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	126	V
Current - Peak Pulse (10/1000µs)	22.8	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Type	Zener	-
Bidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the SMLJ78CA-TP are grouped based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Matching Parameters:

Voltage - Reverse Standoff: 78V (±tolerance)
Voltage - Clamping (Max) @ Ipp: 126V
Voltage - Breakdown (Min): 86.7V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Bidirectional
Bidirectional Channels: 1
Applications: General Purpose

Secondary Compatibility Parameters:

Current - Peak Pulse (10/1000µs): 22.8A ±tolerance
Power - Peak Pulse: 3000W ±tolerance
Operating Temperature Range: -55°C minimum, 150°C or higher maximum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts meeting all critical parameters are direct substitutes. Variations in peak pulse current and power dissipation within the 3000W class are acceptable for general-purpose protection circuits. Temperature range variations are noted but do not preclude substitution when the application operates within the overlapping range.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp Range (°C)	Package	RoHS Status
SMLJ78CA-TP	Micro Commercial Co	78	126	22.8	3000	-55 to 175	DO-214AB, SMC	ROHS3 Compliant
5.0SMDJ78CA	MDE Semiconductor Inc	78	126	39.7	5000	-55 to 150	DO-214AB, SMCJ	ROHS3 Compliant
SMC3K78CA-M3/57	Vishay General Semiconductor - Diodes Division	78	126	23.8	3000	-55 to 150	DO-214AB, SMCJ	ROHS3 Compliant
SMCJ78CA	MDD	78	126	11.9	1500	-50 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ78CA-13-F	Diodes Incorporated	78	126	11.4	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMDJ78CA	Alpha & Omega Semiconductor Inc.	78	126	23.9	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMDJ78CA-T7	Littelfuse Inc.	78	126	23.8	3000	-65 to 150	DO-214AB, SMCJ	ROHS3 Compliant
SMLJ78CA	Bourns Inc.	78	126	22.8	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (3000W Class, 22.8A ±tolerance):

The SMLJ78CA (Bourns Inc.), SMDJ78CA (Alpha & Omega Semiconductor Inc.), SMC3K78CA-M3/57 (Vishay), and SMDJ78CA-T7 (Littelfuse Inc.) are direct electrical and mechanical equivalents to the SMLJ78CA-TP. All maintain 78V reverse standoff, 126V clamping voltage, 3000W peak pulse power, and peak pulse currents within 22.8A ±1.1A. All are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity. Operating temperature ranges overlap at -55°C to 150°C minimum, with the SMLJ78CA-TP offering extended upper range to 175°C. These parts are interchangeable for applications operating within -55°C to 150°C.

Higher Power Alternative (5000W Class):

The 5.0SMDJ78CA (MDE Semiconductor Inc.) maintains identical voltage specifications and package format but provides 39.7A peak pulse current and 5000W peak pulse power. This part is suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection threshold. Operating temperature range is -55°C to 150°C.

Lower Power Alternatives (1500W Class):

The SMCJ78CA (MDD) and SMCJ78CA-13-F (Diodes Incorporated) provide the same voltage protection specifications but with reduced peak pulse current (11.4A to 11.9A) and 1500W peak pulse power. These parts are suitable for lower-energy transient protection applications. SMCJ78CA-13-F extends the lower operating temperature to -55°C, while SMCJ78CA operates from -50°C.

Compliance Status:

All substitute parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, matching the original part's environmental compliance profile. SMDJ78CA-T7 (Littelfuse) is REACH Affected; SMLJ78CA (Bourns) is REACH Affected. The original SMLJ78CA-TP and SMC3K78CA-M3/57 are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can I substitute SMCJ78CA for SMLJ78CA-TP in my circuit?

A: SMCJ78CA matches the voltage specifications (78V standoff, 126V clamping) and package format (DO-214AB, SMC) but provides only 1500W peak pulse power versus the original 3000W. Substitution is valid only if your circuit's transient energy does not exceed 1500W. Verify peak pulse current requirements; SMCJ78CA provides 11.9A versus SMLJ78CA-TP's 22.8A.

Q: What is the difference between SMLJ78CA and SMLJ78CA-TP?

A: SMLJ78CA-TP is the tape and reel (TR) packaged version of the base SMLJ78CA part number. Both are electrically identical. The "-TP" suffix indicates packaging format for automated assembly. Electrical specifications, voltage ratings, and current handling are equivalent.

Q: Is the 5.0SMDJ78CA a direct replacement for SMLJ78CA-TP?

A: The 5.0SMDJ78CA is electrically compatible for voltage protection (78V standoff, 126V clamping) and uses the same DO-214AB package. However, it provides higher peak pulse current (39.7A) and power (5000W). It is a suitable substitute for applications requiring equal or greater transient energy handling. Operating temperature range is -55°C to 150°C versus the original's -55°C to 175°C.

Q: Do all substitute parts have the same moisture sensitivity rating?

A: Yes. All listed substitute parts carry MSL 1 (Unlimited) moisture sensitivity, matching the original SMLJ78CA-TP. No special moisture control measures are required during storage or handling.

Q: Can I use SMDJ78CA-T7 in place of SMLJ78CA-TP?

A: Yes. SMDJ78CA-T7 (Littelfuse Inc.) is a direct electrical equivalent with 78V standoff, 126V clamping, 23.8A peak pulse current, and 3000W power. Package format is DO-214AB (SMCJ). Operating temperature range is -65°C to 150°C. This part is suitable for applications operating within the overlapping temperature range (-55°C to 150°C) and provides extended low-temperature capability.

Q: What are the key parameters I must verify before substituting?

A: Verify the following parameters match your circuit requirements: (1) Voltage - Reverse Standoff: 78V, (2) Voltage - Clamping (Max) @ Ipp: 126V, (3) Current - Peak Pulse (10/1000µs): minimum 22.8A for equivalent performance, (4) Power - Peak Pulse: minimum 3000W for equivalent performance, (5) Package / Case: DO-214AB, SMC, (6) Operating Temperature Range: must encompass your application's operating conditions.

Q: Are there any RoHS or REACH compliance differences among the substitutes?

A: All substitute parts are RoHS3 compliant. REACH status varies: SMLJ78CA-TP and SMC3K78CA-M3/57 are REACH Unaffected; SMDJ78CA-T7 and SMLJ78CA are REACH Affected. Verify your supply chain requirements for REACH-affected components before selection.

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