SMCJ22A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ22A-M3/9AT is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 22V reverse standoff category with a 35.5V maximum clamping voltage and 42.3A peak pulse current rating. The device is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when identical electrical performance parameters and mechanical compatibility are maintained across alternative manufacturers and packaging configurations.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24.4	V
Voltage - Clamping (Max) @ Ipp	35.5	V
Current - Peak Pulse (10/1000µs)	42.3	A
Power - Peak Pulse	1500	W
Type	Zener	-
Unidirectional Channels	1	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ22A-M3/9AT are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Clamping (Max) @ Ipp: 35.5V
Voltage - Breakdown (Min): 24.4V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Grouping Categories:

Group 1 - Direct Electrical & Packaging Equivalents: Parts maintaining identical voltage ratings, clamping specifications, and DO-214AB SMC package configuration with equivalent or superior current handling within the 1500W power class.

Group 2 - Enhanced Performance Substitutes: Parts with identical voltage parameters and package type but increased power dissipation or peak pulse current ratings, suitable for applications requiring higher transient energy absorption.

Group 3 - Packaging Variant Equivalents: Parts with identical electrical specifications but alternative packaging formats (Tape & Reel vs. Cut Tape vs. Bulk), maintaining full electrical interchangeability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Packaging Type	Operating Temp (°C)	RoHS Status
SMCJ22A-M3/9AT	Vishay	22	35.5	42.3	1500	DO-214AB, SMC	Tape & Reel	-55 to 150	ROHS3
SMCJ22A-E3/57T	Vishay	22	35.5	42.3	1500	DO-214AB, SMC	Cut Tape	-55 to 150	ROHS3
SMCJ22A	Fairchild Semiconductor	22	35.5	42.3	1500	DO-214AB, SMC	Bulk	-55 to 150	Not specified
5.0SMDJ22A	Taiwan Semiconductor Corporation	22	35.5	141	5000	DO-214AB, SMC	Tape & Reel	-55 to 175	ROHS3
SMCJ22A-13-F	Diodes Incorporated	22	35.5	42.2	1500	DO-214AB, SMC	Tape & Reel	-55 to 150	ROHS3
SMCJ22A-TR	STMicroelectronics	22	48.3	207	1500	DO-214AB, SMC	Tape & Reel	-55 to 150	ROHS3
SMDJ22A	Alpha & Omega Semiconductor Inc.	22	35.5	84.6	3000	DO-214AB, SMC	Tape & Reel	-55 to 150	ROHS3
SMLJ22A	Bourns Inc.	22	35.5	84.4	3000	DO-214AB, SMC	Tape & Reel	-55 to 150	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

SMCJ22A-E3/57T (Vishay) and SMCJ22A-13-F (Diodes Incorporated) are direct electrical equivalents to the SMCJ22A-M3/9AT. Both maintain 22V reverse standoff, 35.5V clamping voltage, and 42.3A/42.2A peak pulse current specifications. Selection between these parts depends on packaging requirements: SMCJ22A-E3/57T is supplied in Cut Tape format, while SMCJ22A-13-F is supplied in Tape & Reel. The SMCJ22A (Fairchild Semiconductor) provides identical electrical specifications in Bulk packaging. All three options are RoHS3 compliant and suitable for direct replacement in applications requiring 1500W peak pulse power dissipation.

Enhanced Performance Alternatives:

SMDJ22A (Alpha & Omega Semiconductor Inc.) and SMLJ22A (Bourns Inc.) maintain identical voltage parameters (22V standoff, 35.5V clamping) but provide doubled peak pulse current ratings (84.6A and 84.4A respectively) and 3000W power dissipation. These components are suitable for applications experiencing higher transient energy levels while maintaining the same voltage protection window. Both are RoHS3 compliant and operate across the -55°C to 150°C temperature range.

Higher Power Density Option:

5.0SMDJ22A (Taiwan Semiconductor Corporation) provides 22V standoff and 35.5V clamping voltage with significantly elevated power handling (5000W) and peak pulse current (141A). This component extends the operating temperature range to 175°C and is RoHS3 compliant, suitable for high-energy transient suppression applications.

Non-Equivalent Alternative:

SMCJ22A-TR (STMicroelectronics) maintains 22V standoff voltage but specifies a higher clamping voltage of 48.3V with substantially increased peak pulse current (207A). This part does not meet the 35.5V clamping voltage specification and is not a direct substitute for applications requiring strict voltage clamping limits.

Frequently Asked Questions (FAQ)

Q: Can SMCJ22A-E3/57T replace SMCJ22A-M3/9AT directly?

A: Yes. Both parts are manufactured by Vishay and maintain identical electrical specifications: 22V reverse standoff, 35.5V clamping voltage, and 42.3A peak pulse current. The only difference is packaging format (Cut Tape vs. Tape & Reel). Direct substitution is valid for applications where packaging format does not affect assembly processes.

Q: What is the difference between SMCJ22A-M3/9AT and SMDJ22A?

A: Both parts share identical voltage ratings (22V standoff, 35.5V clamping) and DO-214AB SMC package configuration. SMDJ22A provides doubled peak pulse current (84.6A vs. 42.3A) and doubled power dissipation (3000W vs. 1500W). SMDJ22A is suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection window.

Q: Is SMCJ22A-TR a suitable substitute?

A: SMCJ22A-TR is not a direct substitute. While it maintains the 22V reverse standoff voltage, it specifies a higher clamping voltage of 48.3V compared to the required 35.5V. This higher clamping voltage may exceed protection requirements in sensitive circuits. Use only if application specifications permit higher voltage clamping.

Q: Can I use 5.0SMDJ22A in place of SMCJ22A-M3/9AT?

A: 5.0SMDJ22A maintains identical voltage specifications (22V standoff, 35.5V clamping) and is electrically compatible. It provides enhanced power handling (5000W vs. 1500W) and extended temperature range (-55°C to 175°C). Substitution is valid for applications where higher transient energy capacity is beneficial or required.

Q: What does packaging type mean for TVS diode selection?

A: Packaging type (Tape & Reel, Cut Tape, Bulk) affects supply format and assembly compatibility but does not alter electrical performance. Tape & Reel is standard for automated pick-and-place assembly. Cut Tape suits manual or semi-automated processes. Bulk packaging is used for high-volume manual assembly or reel preparation. Select based on manufacturing process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: SMCJ22A-E3/57T, SMCJ22A-13-F, 5.0SMDJ22A, SMDJ22A, and SMLJ22A are all RoHS3 compliant. SMCJ22A (Fairchild) does not specify RoHS status in available documentation. SMCJ22A-TR is RoHS3 compliant. Verify RoHS compliance requirements for your application before final part selection.

Q: What is the significance of the 10/1000µs pulse specification?

A: The 10/1000µs specification defines the peak pulse current rating test condition. This represents a 10µs rise time and 1000µs pulse duration, simulating typical transient overvoltage events. All listed parts use this standard test condition, ensuring comparable current ratings across manufacturers.

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