SMCJ75C Equivalent & Substitute Parts

Part Overview

The SMCJ75C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a 75V reverse standoff voltage and provides clamping at 127.05V with a peak pulse current of 12.4A. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMCJ75C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	75V
Voltage - Clamping (Max) @ Ipp	127.05V
Current - Peak Pulse (10/1000µs)	12.4A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SMCJ75C is determined by the following critical parameters:

Voltage - Reverse Standoff: 75V (all substitutes maintain this specification)
Package / Case: DO-214AB, SMC (surface-mount form factor compatibility)
Bidirectional Channels: 1 (single-channel protection)
Type: Zener (TVS diode technology)
Mounting Type: Surface Mount

Substitute parts are grouped into two categories based on peak pulse current and power dissipation:

Category A (12.4A / 1500W): SMCJ75CA, SMCJ75CA-TP, SMCJ75CAE3/TR13, SMCJ75CE3/TR13 — Direct electrical equivalents with identical peak pulse current and power ratings.

Category B (24.8A / 3000W): SMC3K75CA-M3/57, SMLJ75CA, SMLJ75CA-TP, SMLJ75CAE3/TR13 — Enhanced performance substitutes with doubled peak pulse current and power dissipation capability, suitable for higher transient energy applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
SMCJ75C	Littelfuse Inc.	75V	127.05V	12.4A	1500W	DO-214AB, SMC	Obsolete
SMCJ75CA	Fairchild Semiconductor	75V	121V	12.4A	1500W	DO-214AB, SMC	Active
SMCJ75CA-TP	Micro Commercial Co	75V	121V	12.4A	1500W	DO-214AB, SMC	Active
SMCJ75CAE3/TR13	Microchip Technology	75V	121V	12.4A	1500W	DO-214AB, SMC	Active
SMCJ75CE3/TR13	Microchip Technology	75V	134V	11.2A	1500W	DO-214AB, SMC	Active
SMC3K75CA-M3/57	Vishay General Semiconductor - Diodes Division	75V	121V	24.8A	3000W	DO-214AB, SMC	Active
SMLJ75CA	Bourns Inc.	75V	121V	24.8A	3000W	DO-214AB, SMC	Active
SMLJ75CA-TP	Micro Commercial Co	75V	121V	24.8A	3000W	DO-214AB, SMC	Active
SMLJ75CAE3/TR13	Microchip Technology	75V	121V	24.8A	3000W	DO-214AB, SMC	Active

Engineering Selection Recommendations

For direct replacement with identical electrical performance:

SMCJ75CA (Fairchild Semiconductor) is the primary active substitute, maintaining 12.4A peak pulse current and 1500W power dissipation. This part is in active production with high inventory availability (7178 pcs).

SMCJ75CAE3/TR13 (Microchip Technology) and SMCJ75CA-TP (Micro Commercial Co) provide equivalent electrical specifications in tape-and-reel packaging, suitable for automated assembly processes.

For enhanced protection capability:

SMC3K75CA-M3/57 (Vishay General Semiconductor), SMLJ75CA (Bourns Inc.), and SMLJ75CAE3/TR13 (Microchip Technology) offer doubled peak pulse current (24.8A) and power dissipation (3000W) while maintaining the 75V reverse standoff voltage and DO-214AB package. These parts are appropriate for applications requiring higher transient energy absorption.

Compliance considerations:

All active substitutes are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. SMCJ75CE3/TR13 exhibits higher clamping voltage (134V) and lower peak pulse current (11.2A), making it suitable only for applications tolerating increased clamping voltage.

Frequently Asked Questions (FAQ)

Q: Can SMCJ75CA directly replace SMCJ75C?

A: Yes. Both parts maintain 75V reverse standoff voltage, 12.4A peak pulse current, 1500W power dissipation, and DO-214AB surface-mount packaging. The primary difference is product status: SMCJ75C is obsolete while SMCJ75CA is in active production.

Q: What is the difference between Category A (12.4A) and Category B (24.8A) substitutes?

A: Category A substitutes (SMCJ75CA, SMCJ75CA-TP, SMCJ75CAE3/TR13) maintain the original 12.4A peak pulse current and 1500W power rating. Category B substitutes (SMC3K75CA-M3/57, SMLJ75CA, SMLJ75CA-TP, SMLJ75CAE3/TR13) provide doubled peak pulse current (24.8A) and power dissipation (3000W). Category B parts are suitable for applications with higher transient energy requirements.

Q: Are all substitutes available in the same package?

A: Yes. All substitute parts use DO-214AB (SMC) surface-mount packaging, ensuring mechanical and electrical compatibility with the original SMCJ75C footprint.

Q: What is the significance of clamping voltage variation among substitutes?

A: The SMCJ75C specifies 127.05V maximum clamping voltage. Most active substitutes clamp at 121V, which is within acceptable tolerance for general-purpose overvoltage protection. SMCJ75CE3/TR13 clamps at 134V and is suitable only for applications tolerating higher clamping voltage.

Q: Which substitute offers the best inventory availability?

A: SMCJ75CA (Fairchild Semiconductor) has the highest inventory level at 7178 pcs, followed by SMLJ75CA (Bourns Inc.) at 21436 pcs. Both are in active production status.

Q: Are tape-and-reel packaged substitutes compatible with bulk-packaged designs?

A: Tape-and-reel (TR) packaged parts (SMCJ75CA-TP, SMCJ75CAE3/TR13, SMLJ75CA, SMLJ75CA-TP, SMLJ75CAE3/TR13) are electrically and mechanically identical to bulk-packaged equivalents. The packaging format affects only handling and assembly processes, not component performance.

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