SMCJ78CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ78CA-M3/9AT is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 78V reverse standoff voltage class with a 126V maximum clamping voltage and 11.9A peak pulse current rating. The device is designed for general-purpose transient protection applications and is classified as Active product status. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity while maintaining electrical and mechanical compatibility.

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)	11.9	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C (TJ)
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 SMCJ78CA-M3/9AT are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters (Must Match):

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

Secondary Parameters (Allowable Variation):

Current - Peak Pulse (10/1000µs): 11.9A nominal; substitutes with 11.4A to 39.7A are acceptable for applications not requiring exact current matching
Power - Peak Pulse: 1500W nominal; substitutes with 1500W to 5000W are acceptable
Operating Temperature Range: -55°C to 150°C nominal; substitutes with -50°C to 175°C are acceptable

Substitute parts are grouped into two categories: direct equivalents (identical electrical specifications) and functional equivalents (same voltage class and package with different current/power ratings or temperature ranges).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Package	RoHS Status
SMCJ78CA-M3/9AT	Vishay General Semiconductor - Diodes Division	78	86.7	126	11.9	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ78CA-E3/57T	Vishay General Semiconductor - Diodes Division	78	86.7	126	11.9	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ78CA-TP	Micro Commercial Co	78	86.7	126	11.9	1500	-55 to 175	DO-214AB, SMC	ROHS3 Compliant
5.0SMDJ78CA	MDE Semiconductor Inc	78	86.7	126	39.7	5000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ78CA	MDD	78	86.7	126	11.9	1500	-50 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ78CA-13-F	Diodes Incorporated	78	86.7	126	11.4	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMDJ78CA	Alpha & Omega Semiconductor Inc.	78	86.7	126	23.9	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMDJ78CA-T7	Littelfuse Inc.	78	86.7	126	23.8	3000	-65 to 150	DO-214AB, SMC	ROHS3 Compliant
SMLJ78CA	Bourns Inc.	78	86.7	126	22.8	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory and environmental standards alignment with the original SMCJ78CA-M3/9AT.

Direct Equivalents (Identical Electrical Specifications): SMCJ78CA-E3/57T from Vishay General Semiconductor - Diodes Division is a direct equivalent with matching voltage, current, and power specifications. This part is suitable for direct substitution without circuit redesign.

Functional Equivalents with Extended Temperature Range: SMCJ78CA-TP from Micro Commercial Co extends the operating temperature range to -55°C to 175°C while maintaining all other electrical parameters. This part is suitable for applications requiring enhanced thermal performance.

Functional Equivalents with Increased Current/Power Ratings: 5.0SMDJ78CA from MDE Semiconductor Inc, SMDJ78CA from Alpha & Omega Semiconductor Inc., SMDJ78CA-T7 from Littelfuse Inc., and SMLJ78CA from Bourns Inc. provide higher peak pulse current and power dissipation ratings (23.8A to 39.7A and 3000W to 5000W respectively). These parts are suitable for applications requiring enhanced transient protection capability within the same voltage class.

Functional Equivalent with Minimal Current Variation: SMCJ78CA-13-F from Diodes Incorporated provides a peak pulse current of 11.4A, representing a 0.5A reduction from the original specification. This part is suitable for applications where the slightly reduced current rating does not impact circuit protection requirements.

Alternative Manufacturer Options: SMCJ78CA from MDD provides equivalent electrical specifications with a slightly reduced operating temperature minimum of -50°C. This part is suitable for applications not requiring the full -55°C lower temperature limit.

Frequently Asked Questions (FAQ)

Q: Can SMCJ78CA-E3/57T be used as a direct replacement for SMCJ78CA-M3/9AT? A: Yes. Both parts share identical voltage specifications (78V reverse standoff, 86.7V breakdown, 126V clamping), current rating (11.9A), power rating (1500W), operating temperature range (-55°C to 150°C), and package type (DO-214AB, SMC). The difference is in the tape and reel configuration and supplier designation.

Q: What is the difference between SMCJ78CA-M3/9AT and the higher-power alternatives like SMDJ78CA-T7? A: SMDJ78CA-T7 maintains the same voltage specifications and package but provides double the peak pulse current (23.8A vs 11.9A) and double the power dissipation (3000W vs 1500W). This makes it suitable for applications requiring enhanced transient protection. The voltage clamping characteristics remain identical.

Q: Is SMCJ78CA-TP compatible with the original part in all applications? A: SMCJ78CA-TP is electrically compatible with identical voltage and current specifications. The extended operating temperature range (-55°C to 175°C vs -55°C to 150°C) provides additional thermal margin. It is suitable for all applications where the original part is used, with enhanced performance in high-temperature environments.

Q: Can I use 5.0SMDJ78CA instead of SMCJ78CA-M3/9AT? A: 5.0SMDJ78CA is electrically compatible in terms of voltage specifications and package type. However, it provides significantly higher peak pulse current (39.7A vs 11.9A) and power dissipation (5000W vs 1500W). Use this part only if your application requires enhanced transient protection capability. Standard applications should use parts with matching current ratings.

Q: Are all substitute parts in 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 SMCJ78CA-M3/9AT.

Q: What compliance certifications do the substitute parts maintain? A: All substitute parts listed are ROHS3 compliant and maintain Active product status, ensuring regulatory alignment with the original component.

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