SMCJ22HE3/9AT Transient Voltage Suppressor Diode – Equivalent & Substitute Parts

Part Overview

The SMCJ22HE3/9AT is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AB (SMC) package. This component operates with a 22V reverse standoff voltage and provides 39.4V maximum clamping voltage at peak pulse current of 38.1A, delivering 1500W peak pulse power dissipation across an operating temperature range of -55°C to 150°C.

The SMCJ22HE3/9AT is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical characteristics, maintaining compatibility with existing circuit designs while offering improved availability and active product status.

Key Parameters

Parameter	Value	Unit
Voltage – Reverse Standoff (Typ)	22	V
Voltage – Breakdown (Min)	24.4	V
Voltage – Clamping (Max) @ Ipp	39.4	V
Current – Peak Pulse (10/1000µs)	38.1	A
Power – Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMCJ22HE3/9AT is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Voltage – Reverse Standoff (Typ): 22V
Voltage – Breakdown (Min): 24.4V
Package / Case: DO-214AB, SMC (surface mount)
Unidirectional Channels: 1
Type: Zener diode

Acceptable Variation Parameters:

Voltage – Clamping (Max) @ Ipp: 35.5V to 48.3V (lower or equal clamping voltage acceptable for circuit protection)
Current – Peak Pulse (10/1000µs): 38.1A or higher (higher current rating acceptable)
Power – Peak Pulse: 1500W or higher (higher power dissipation acceptable)
Operating Temperature Range: -55°C minimum to 150°C or higher (extended range acceptable)

Substitute parts maintain identical voltage standoff and breakdown specifications while offering equivalent or enhanced current handling and power dissipation capabilities. All substitute parts are classified as active products with current manufacturing status and full RoHS3 compliance.

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)	Product Status	Package
SMCJ22HE3/9AT	Vishay General Semiconductor	22	24.4	39.4	38.1	1500	-55 to 150	Obsolete	DO-214AB, SMC
SMCJ22E3/TR13	Microchip Technology	22	24.4	39.4	38.1	1500	-65 to 150	Active	DO-214AB, SMC
5.0SMDJ22A	Taiwan Semiconductor Corporation	22	24.4	35.5	141	5000	-55 to 175	Active	DO-214AB, SMC
SMCJ22A	Fairchild Semiconductor	22	24.4	35.5	42.3	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ22A-13-F	Diodes Incorporated	22	24.4	35.5	42.2	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ22A-TR	STMicroelectronics	22	24.4	48.3	207	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ22AE3/TR13	Microchip Technology	22	24.4	35.5	42.2	1500	-65 to 150	Active	DO-214AB, SMC
SMDJ22A	Alpha & Omega Semiconductor Inc.	22	24.4	35.5	84.6	3000	-55 to 150	Active	DO-214AB, SMC
SMLJ22A	Bourns Inc.	22	24.4	35.5	84.4	3000	-55 to 150	Active	DO-214AB, SMC
SMLJ22AE3/TR13	Microchip Technology	22	24.4	35.5	84.4	300	-55 to 150	Active	DO-214AB, SMC

Engineering Selection Recommendations

Direct Electrical Equivalent (Identical Specifications): SMCJ22E3/TR13 from Microchip Technology provides identical electrical performance to the SMCJ22HE3/9AT with extended operating temperature range (-65°C to 150°C). This part is active and available in tape & reel packaging, offering the most direct replacement with enhanced temperature capability.

Enhanced Performance Alternatives (Higher Current/Power Rating): Parts including 5.0SMDJ22A, SMDJ22A, SMLJ22A, and SMLJ22AE3/TR13 maintain identical voltage specifications while providing increased peak pulse current and power dissipation. These alternatives are suitable for applications requiring higher transient energy absorption without circuit redesign.

All substitute parts listed are:

Active products with current manufacturing status
RoHS3 compliant
Surface mount DO-214AB (SMC) package compatible
Unidirectional zener diodes with single channel configuration
Rated for -55°C minimum operating temperature or lower

Selection should prioritize active products with established supply chain availability. Microchip Technology variants (SMCJ22E3/TR13, SMCJ22AE3/TR13) offer extended temperature ranges suitable for automotive and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ22A substitute for SMCJ22HE3/9AT? A: Yes. SMCJ22A maintains identical voltage specifications (22V standoff, 24.4V breakdown) and operates in the same DO-214AB package. The clamping voltage is lower (35.5V vs. 39.4V), which is acceptable for transient suppression circuits. Peak pulse current is slightly higher (42.3A vs. 38.1A), providing equivalent or improved protection.

Q: What is the difference between SMCJ22E3/TR13 and SMCJ22HE3/9AT? A: Both parts are electrically identical with 22V standoff voltage, 24.4V breakdown voltage, and 39.4V clamping voltage. The primary differences are manufacturer (Microchip vs. Vishay), product status (active vs. obsolete), packaging format (tape & reel vs. bulk), and operating temperature range (SMCJ22E3/TR13 extends to -65°C). SMCJ22E3/TR13 is the recommended replacement.

Q: Why do some substitute parts have higher peak pulse current ratings? A: Higher current ratings (e.g., SMDJ22A at 84.6A vs. 38.1A) indicate enhanced transient energy absorption capability. These parts maintain identical voltage protection thresholds while providing greater margin for transient suppression. They are directly substitutable and offer improved reliability in high-energy transient environments.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed are RoHS3 compliant and suitable for applications requiring environmental compliance certification.

Q: What packaging options are available? A: Substitute parts are available in tape & reel (TR) and bulk packaging formats. Tape & reel packaging (SMCJ22E3/TR13, SMCJ22AE3/TR13, SMDJ22A, SMLJ22A, SMLJ22AE3/TR13) is standard for automated assembly. Bulk packaging (SMCJ22A) is available for manual assembly or lower-volume applications.

Q: Can I use 5.0SMDJ22A for higher power applications? A: Yes. The 5.0SMDJ22A provides 5000W peak pulse power dissipation compared to 1500W in the original part, with identical voltage specifications. This part is suitable for applications requiring enhanced transient energy handling while maintaining the same circuit protection voltage thresholds.

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