SMCJ30CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ30CA-M3/9AT is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 30V reverse standoff voltage class and provides transient protection for general-purpose applications. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility within the DO-214AB (SMC) form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	31	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ30CA-M3/9AT are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical Equivalents (31A Peak Pulse Current) These parts maintain identical voltage ratings (30V reverse standoff, 33.3V breakdown minimum, 48.4V clamping maximum) and peak pulse current (31A at 10/1000µs), with 1500W peak pulse power. All are packaged in DO-214AB (SMC) surface mount form factor. Substitution within this category is based on matching these core electrical parameters and package specifications.

Category 2: Enhanced Performance Alternatives (Higher Current Rating) These parts share the same voltage specifications but provide increased peak pulse current capacity (62A to 103A) and higher power dissipation (3000W to 5000W). These are suitable for applications requiring greater transient energy absorption while maintaining the same voltage protection threshold.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 30V (required match)
Voltage - Breakdown (Min): 33.3V (required match)
Voltage - Clamping (Max) @ Ipp: 48.4V (required match)
Package / Case: DO-214AB, SMC (required match for direct substitution)
Type: Zener, Bidirectional (required match)
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited)

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Status
SMCJ30CA-M3/9AT	Vishay	30	33.3	48.4	31	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ30CA-E3/57T	Vishay	30	33.3	48.4	31	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ30CA-E3/9AT	Vishay	30	33.3	48.4	31	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ30CA	MDD	30	33.3	48.4	31	1500	-50 to 150	DO-214AB (SMC)	Active
SMCJ30CA-13-F	Diodes Incorporated	30	33.3	48.4	31	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ30CA-TP	Micro Commercial Co	30	33.3	48.4	31	1500	-55 to 175	DO-214AB (SMC)	Active
5.0SMDJ30CA	MDE Semiconductor Inc	30	33.3	48.4	103	5000	-55 to 150	DO-214AB (SMC)	Active
5.0SMDJ30CA-T7	Littelfuse Inc.	30	33.3	48.4	103	5000	-65 to 150	DO-214AB (SMC)	Active
SMCJ30CA-TR	STMicroelectronics	30	33.3	64.3	156	1500	-55 to 150	DO-214AB (SMC)	Active
SMLJ30CA	Bourns Inc.	30	33.3	48.4	62	3000	-55 to 150	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Substitution (Identical Electrical Performance): SMCJ30CA-E3/57T, SMCJ30CA-E3/9AT, SMCJ30CA (MDD), SMCJ30CA-13-F, and SMCJ30CA-TP are direct functional equivalents with matching voltage ratings, peak pulse current (31A), and power dissipation (1500W). All maintain RoHS3 compliance and MSL 1 rating. Selection among these parts is based on packaging format (tape & reel vs. cut tape), inventory availability, and operating temperature requirements. SMCJ30CA-TP offers extended upper temperature rating to 175°C compared to the standard 150°C maximum.

Enhanced Performance Substitution (Higher Current Capacity): 5.0SMDJ30CA and 5.0SMDJ30CA-T7 provide 103A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications. These parts are suitable for applications requiring greater transient energy absorption. 5.0SMDJ30CA-T7 extends the lower operating temperature to -65°C. Both maintain RoHS3 compliance.

Non-Standard Voltage Clamping: SMCJ30CA-TR (STMicroelectronics) exhibits 64.3V clamping voltage with 156A peak pulse current, representing a different electrical characteristic. This part is not recommended as a direct substitute due to the elevated clamping voltage, which may exceed circuit protection thresholds designed for 48.4V operation.

Compliance Verification: All recommended substitute parts maintain active product status, RoHS3 compliance, and MSL 1 rating. SMLJ30CA carries REACH Affected status; verify regulatory requirements for your application region before selection.

Frequently Asked Questions (FAQ)

Q: Can SMCJ30CA-E3/57T replace SMCJ30CA-M3/9AT directly? A: Yes. Both parts share identical voltage ratings (30V reverse standoff, 33.3V breakdown, 48.4V clamping), peak pulse current (31A), and power dissipation (1500W). The difference is packaging format: -E3/57T uses tape & reel (57mm), while -M3/9AT uses tape & reel (9mm). Verify your assembly equipment compatibility with the reel width before substitution.

Q: What is the difference between the 31A and 103A versions? A: The 31A versions (SMCJ30CA series) and 103A versions (5.0SMDJ30CA series) maintain identical voltage protection thresholds but differ in peak pulse current capacity and power dissipation. The 103A versions (5000W) absorb greater transient energy. Use 103A versions only if your application requires higher current handling; standard 31A versions are sufficient for general-purpose protection.

Q: Why does SMCJ30CA-TR show 64.3V clamping instead of 48.4V? A: SMCJ30CA-TR is a different electrical variant within the 30V reverse standoff class. The elevated clamping voltage indicates different internal design characteristics. This part is not interchangeable with SMCJ30CA-M3/9AT for applications requiring 48.4V clamping specification.

Q: Are all substitute parts available in the same DO-214AB (SMC) package? A: Yes. All listed substitute parts use DO-214AB (SMC) surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: What is the significance of the temperature range difference in SMCJ30CA-TP (-55 to 175°C)? A: SMCJ30CA-TP extends the maximum junction temperature rating to 175°C compared to the standard 150°C. This provides additional thermal margin for high-temperature applications. The part is otherwise electrically identical to SMCJ30CA-M3/9AT.

Q: Does operating temperature range affect substitution eligibility? A: Operating temperature range affects suitability for specific application environments but does not prevent substitution. Verify that the substitute part's temperature range meets your circuit's thermal requirements. Parts with narrower ranges (e.g., -50 to 150°C) are suitable for standard industrial applications; extended ranges provide flexibility for extreme environments.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, meeting standard electronic component environmental requirements.

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