SMCJ70CA-M3/57T Equivalent & Substitute Parts

Part Overview

The SMCJ70CA-M3/57T is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 70V reverse standoff category and is designed for general-purpose transient protection 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 mechanical compatibility within the DO-214AB (SMC) package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70	V
Voltage - Breakdown (Min)	77.8	V
Voltage - Clamping (Max) @ Ipp	113	V
Current - Peak Pulse (10/1000µs)	13.3	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ70CA-M3/57T are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 70V
Voltage - Breakdown (Min): 77.8V
Voltage - Clamping (Max) @ Ipp: 113V
Current - Peak Pulse (10/1000µs): 13.3A
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1

Grouping Categories:

Group 1: Direct Electrical & Mechanical Equivalents Parts matching all critical parameters with identical electrical performance and packaging specifications.

Group 2: Manufacturer Variants Parts from different manufacturers with identical electrical specifications and package compatibility.

Group 3: Enhanced Performance Alternatives Parts with higher peak pulse current or power ratings while maintaining voltage compatibility and package form factor.

Group 4: Parameter Variants Parts with modified electrical characteristics or temperature ranges that may require application-level verification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	RoHS3
SMCJ70CA-M3/57T	Vishay General Semiconductor	70	77.8	113	13.3	1500	-55 to 150	DO-214AB, SMC	Yes
SMCJ70CA-E3/57T	Vishay General Semiconductor	70	77.8	113	13.3	1500	-55 to 150	DO-214AB, SMC	Yes
SMCJ70CA	Fairchild Semiconductor	70	77.8	113	13.3	1500	-55 to 150	DO-214AB, SMC	-
SMCJ70CA-13-F	Diodes Incorporated	70	77.8	113	13.3	1500	-55 to 150	DO-214AB, SMC	Yes
SMCJ70CA-TP	Micro Commercial Co	70	77.8	113	13.3	1500	-55 to 175	DO-214AB, SMC	Yes
5.0SMDJ70CA	MDE Semiconductor Inc	70	77.8	113	44.3	5000	-55 to 150	DO-214AB, SMC	Yes
SMCJ70CA-TR	STMicroelectronics	70	77.8	146	69	1500	-55 to 150	DO-214AB, SMC	Yes

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical & Mechanical Performance):

SMCJ70CA-E3/57T, SMCJ70CA, SMCJ70CA-13-F, and SMCJ70CA-TP are functionally equivalent to the SMCJ70CA-M3/57T. All maintain the 70V reverse standoff voltage, 113V clamping voltage, and 13.3A peak pulse current specification. These parts are suitable for direct replacement in existing designs without circuit modification. SMCJ70CA-TP offers an extended operating temperature range to 175°C, providing additional thermal margin in high-temperature applications. All substitute parts in this category maintain RoHS3 compliance and MSL 1 rating.

Enhanced Performance Alternatives:

5.0SMDJ70CA provides higher peak pulse current (44.3A) and power dissipation (5000W) while maintaining voltage compatibility. This part is suitable for applications requiring greater transient energy absorption capacity within the same voltage protection window.

SMCJ70CA-TR from STMicroelectronics exhibits a higher clamping voltage (146V) and significantly higher peak pulse current (69A at 8/20µs pulse). This part is not a direct substitute due to modified electrical characteristics and should be selected only when higher clamping voltage and current handling are design requirements.

Compliance & Availability:

All recommended substitute parts maintain active production status and RoHS3 compliance. Inventory availability varies by part number and packaging configuration (Tape & Reel, Cut Tape, or Digi-Reel).

Frequently Asked Questions (FAQ)

Q: Can SMCJ70CA-TP replace SMCJ70CA-M3/57T in all applications?

A: Yes. SMCJ70CA-TP is electrically and mechanically equivalent with identical voltage and current specifications. The extended operating temperature range (-55°C to 175°C versus -55°C to 150°C) provides additional thermal capability without affecting circuit performance.

Q: What is the difference between SMCJ70CA-M3/57T and 5.0SMDJ70CA?

A: Both parts maintain 70V reverse standoff and 113V clamping voltage. The 5.0SMDJ70CA provides higher peak pulse current (44.3A versus 13.3A) and power dissipation (5000W versus 1500W). Selection depends on transient energy requirements in the application.

Q: Is SMCJ70CA-TR a suitable replacement?

A: SMCJ70CA-TR differs in clamping voltage (146V versus 113V) and peak pulse current (69A versus 13.3A). It is not a direct substitute. Use only if the application requires higher clamping voltage and current handling specifications.

Q: Do all substitute parts use the same DO-214AB (SMC) package?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original SMCJ70CA-M3/57T design.

Q: Are there packaging format differences among substitutes?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel. These are distribution formats only and do not affect component electrical or mechanical specifications. Select based on assembly process requirements.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts maintain RoHS3 compliance and MSL 1 (unlimited moisture sensitivity) rating. REACH status is unaffected for all listed parts. Verify specific certifications with component datasheets for specialized applications.

Q: Can SMCJ70CA from Fairchild Semiconductor replace the Vishay part?

A: Yes. The Fairchild SMCJ70CA maintains identical electrical specifications (70V standoff, 113V clamping, 13.3A peak pulse) and DO-214AB packaging. Compliance documentation should be verified for your specific application requirements.

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