SMCJ22CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ22CA-M3/9AT is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AB (SMC) package and provides transient overvoltage protection for general-purpose applications. The part is active and ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging configurations are required, or when different current-handling capabilities are needed for specific circuit protection requirements while maintaining the same voltage protection characteristics.

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	-
Bidirectional Channels	1	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the SMCJ22CA-M3/9AT is determined by the following critical parameters:

Voltage Parameters (Must Match):

Reverse Standoff Voltage: 22V (Typ)
Breakdown Voltage (Min): 24.4V
Clamping Voltage (Max) @ Ipp: 35.5V

Electrical Parameters (Must Match or Exceed):

Peak Pulse Current: 42.3A minimum
Peak Pulse Power: 1500W minimum

Physical & Environmental Parameters (Must Match):

Package Type: DO-214AB (SMC)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum
Bidirectional Channels: 1
Type: Zener

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories: direct equivalents (identical electrical and physical specifications) and functional equivalents (higher current/power ratings with identical voltage protection characteristics).

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	RoHS Status
SMCJ22CA-M3/9AT	Vishay General Semiconductor	22	24.4	35.5	42.3	1500	DO-214AB (SMC)	-55 to 150	ROHS3
SMCJ22CA-E3/57T	Vishay General Semiconductor	22	24.4	35.5	42.3	1500	DO-214AB (SMCJ)	-55 to 150	ROHS3
SMCJ22CA	Meritek	22	24.4	35.5	42.25	1500	DO-214AB (SMC)	-55 to 150	ROHS3
SMCJ22CA-TP	Micro Commercial Co	22	24.4	35.5	42.3	1500	DO-214AB (SMC)	-55 to 175	ROHS3
5.0SMDJ22CA	MDE Semiconductor Inc	22	24.4	35.5	141	5000	DO-214AB (SMCJ)	-55 to 150	ROHS3
SMCJ22CA-13-F	Diodes Incorporated	22	24.4	35.5	42.2	1500	DO-214AB (SMC)	-55 to 150	ROHS3
SMDJ22CA	Alpha & Omega Semiconductor Inc.	22	24.4	35.5	84.6	3000	DO-214AB	-55 to 150	ROHS3
SMLJ22CA	Bourns Inc.	22	24.4	35.5	84.4	3000	DO-214AB (SMC)	-55 to 150	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Identical Specifications):

The SMCJ22CA-E3/57T (Vishay), SMCJ22CA (Meritek), SMCJ22CA-TP (Micro Commercial Co), and SMCJ22CA-13-F (Diodes Incorporated) are direct functional equivalents to the SMCJ22CA-M3/9AT. These parts maintain identical voltage protection characteristics (22V standoff, 35.5V clamping) and equivalent peak pulse current ratings (42.2–42.3A). All are ROHS3 compliant with MSL 1 rating. The SMCJ22CA-TP offers an extended operating temperature range to 175°C, providing additional thermal margin for high-temperature applications.

Higher Current/Power Alternatives:

The 5.0SMDJ22CA (MDE Semiconductor Inc), SMDJ22CA (Alpha & Omega Semiconductor Inc.), and SMLJ22CA (Bourns Inc.) provide identical voltage protection with significantly higher current-handling capability (84.4–141A) and power dissipation (3000–5000W). These parts are suitable for applications requiring enhanced transient energy absorption while maintaining the same 22V protection threshold. All maintain ROHS3 compliance and -55°C to 150°C operating range.

Selection between direct equivalents and higher-rated alternatives depends on circuit transient energy requirements. Direct equivalents are appropriate for applications with transient currents up to 42.3A. Higher-rated alternatives are necessary when circuit analysis indicates peak transient currents exceeding 42.3A or when additional design margin is required.

Frequently Asked Questions (FAQ)

Q: Can SMCJ22CA-E3/57T replace SMCJ22CA-M3/9AT directly?

A: Yes. Both parts are manufactured by Vishay with identical electrical specifications: 22V standoff voltage, 35.5V clamping voltage, and 42.3A peak pulse current. The difference is in packaging designation (E3/57T vs. M3/9AT tape and reel configurations). Electrical performance and board-level compatibility are equivalent.

Q: What is the difference between SMCJ22CA and SMDJ22CA?

A: Both maintain identical voltage protection (22V standoff, 35.5V clamping). The primary difference is peak pulse current rating: SMCJ22CA handles 42.3A at 1500W, while SMDJ22CA handles 84.6A at 3000W. SMDJ22CA is suitable for higher-energy transient events. Both use DO-214AB (SMC) packaging and are surface mount compatible.

Q: Is the SMCJ22CA-TP suitable for high-temperature environments?

A: The SMCJ22CA-TP operates to 175°C junction temperature, compared to 150°C for the SMCJ22CA-M3/9AT. This extended range provides additional thermal margin in applications with elevated ambient temperatures or high-frequency transient activity. Electrical protection characteristics remain identical.

Q: Can I use 5.0SMDJ22CA in place of SMCJ22CA-M3/9AT?

A: Yes, with design consideration. The 5.0SMDJ22CA provides identical voltage protection (22V standoff, 35.5V clamping) but with significantly higher current capacity (141A vs. 42.3A) and power rating (5000W vs. 1500W). This part is suitable for circuits with higher transient energy. No electrical incompatibility exists; the higher rating provides additional protection margin.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original SMCJ22CA-M3/9AT specifications.

Q: What determines whether a part is a valid substitute?

A: Valid substitutes must maintain identical voltage parameters (22V standoff, 24.4V breakdown minimum, 35.5V clamping maximum), operate in the same DO-214AB (SMC) surface mount package, support the same -55°C to 150°C operating range minimum, and maintain ROHS3 compliance. Peak pulse current and power ratings may be equal or higher without affecting compatibility.

Q: Can SMLJ22CA replace SMCJ22CA-M3/9AT?

A: Yes. SMLJ22CA (Bourns Inc.) provides identical voltage protection and operates in the same DO-214AB (SMC) package. Peak pulse current is 84.4A (vs. 42.3A) and power rating is 3000W (vs. 1500W). This part is suitable for applications requiring higher transient energy absorption while maintaining identical voltage clamping characteristics.

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