SMCJ30C Equivalent & Substitute Parts

Part Overview

The SMCJ30C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30V reverse standoff voltage with a 50.82V maximum clamping voltage and 31A peak pulse current capability in a DO-214AB (SMC) package. The SMCJ30C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMCJ30C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	30V
Voltage - Breakdown (Min)	31.55V
Voltage - Clamping (Max) @ Ipp	50.82V
Current - Peak Pulse (10/1000µs)	31A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMCJ30C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 30V (exact match required)
Voltage - Breakdown (Min): 31.55V to 33.3V (acceptable range)
Voltage - Clamping (Max) @ Ipp: 48.4V to 64.3V (within operational tolerance)
Current - Peak Pulse (10/1000µs): 28A to 156A (equal or greater capacity acceptable)
Power - Peak Pulse: 1500W to 3000W (equal or greater capacity acceptable)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to -65°C minimum; 150°C to 175°C maximum
RoHS3 Compliance: Required
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped into two categories based on power dissipation capacity: standard 1500W devices (SMCJ series) and enhanced 3000W devices (SMLJ series). Both categories maintain the same voltage specifications and package form factor, allowing direct substitution based on application power requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
SMCJ30C	Littelfuse Inc.	30V	31.55V	50.82V	31A	1500W	-55°C ~ 150°C	Obsolete
SMCJ30CA	MDD	30V	33.3V	48.4V	31A	1500W	-50°C ~ 150°C	Active
SMCJ30CA-13-F	Diodes Incorporated	30V	33.3V	48.4V	31A	1500W	-55°C ~ 150°C	Active
SMCJ30CA-TP	Micro Commercial Co	30V	33.3V	48.4V	31A	1500W	-55°C ~ 175°C	Active
SMCJ30CA-TR	STMicroelectronics	30V	33.3V	64.3V	156A (8/20µs)	1500W	-55°C ~ 150°C	Active
SMCJ30CAE3/TR13	Microchip Technology	30V	33.3V	48.4V	31A	1500W	-65°C ~ 150°C	Active
SMCJ30CE3/TR13	Microchip Technology	30V	33.3V	54.6V	28A	1500W	-65°C ~ 150°C	Active
SMLJ30CA	Bourns Inc.	30V	33.3V	48.4V	62A	3000W	-55°C ~ 150°C	Active
SMLJ30CA-TP	Micro Commercial Co	30V	33.3V	48.4V	62A	3000W	-55°C ~ 175°C	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 rating, providing long-term availability and regulatory compliance advantages over the obsolete SMCJ30C.

Standard 1500W Capacity Substitutes (SMCJ Series): SMCJ30CA (MDD), SMCJ30CA-13-F (Diodes Incorporated), SMCJ30CA-TP (Micro Commercial Co), SMCJ30CAE3/TR13 (Microchip Technology), and SMCJ30CE3/TR13 (Microchip Technology) maintain the original 1500W power dissipation specification. These parts are suitable for applications where the SMCJ30C was originally specified. SMCJ30CA-TP and SMCJ30CAE3/TR13 offer extended operating temperature ranges (-55°C to -65°C minimum), beneficial for harsh environment applications. SMCJ30CA-TR (STMicroelectronics) provides significantly higher peak pulse current (156A) while maintaining 1500W power rating, suitable for applications requiring enhanced transient suppression capability.

Enhanced 3000W Capacity Substitutes (SMLJ Series): SMLJ30CA (Bourns Inc.) and SMLJ30CA-TP (Micro Commercial Co) double the power dissipation capacity to 3000W while maintaining identical voltage specifications and package form factor. These parts are direct upgrades for applications experiencing thermal stress or requiring additional margin. SMLJ30CA-TP offers the widest operating temperature range (-55°C to 175°C).

Frequently Asked Questions (FAQ)

Q: Can SMCJ30C be directly replaced with any of the listed substitutes? A: Yes, all listed parts maintain the critical 30V reverse standoff voltage, DO-214AB (SMC) package, and surface-mount configuration. Electrical performance differences are within acceptable operational tolerances for general-purpose transient voltage suppression applications.

Q: What is the difference between SMCJ and SMLJ series substitutes? A: The SMLJ series provides double the power dissipation capacity (3000W versus 1500W) while maintaining identical voltage ratings and package form factor. Selection depends on application thermal requirements and transient energy levels.

Q: Are there temperature range considerations for substitute selection? A: Yes. SMCJ30CAE3/TR13 and SMCJ30CE3/TR13 support -65°C minimum operation. SMCJ30CA-TP and SMLJ30CA-TP support 175°C maximum operation. Standard parts support -55°C to 150°C. Select based on specific application temperature requirements.

Q: Does clamping voltage variation affect substitutability? A: Clamping voltage ranges from 48.4V to 64.3V across substitutes, compared to the original 50.82V. All values remain within acceptable suppression performance for 30V standoff applications. SMCJ30CA-TR provides the highest clamping voltage (64.3V) with enhanced current handling (156A).

Q: What packaging options are available? A: All substitutes are supplied in DO-214AB (SMC) surface-mount package. Tape & Reel (TR) and Cut Tape (CT) packaging options are available from various manufacturers for production volume requirements.

Q: Are all substitutes RoHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current regulatory requirements.

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