SMDJ22C Equivalent & Substitute Parts

Part Overview

The SMDJ22C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with a 22V reverse standoff voltage and provides 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The SMDJ22C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	22V
Voltage - Breakdown (Min)	23.09V
Voltage - Clamping (Max) @ Ipp	37.28V
Current - Peak Pulse (10/1000µs)	84.5A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMDJ22C are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Reverse Standoff Voltage: 22V (exact match required)
Package / Case: DO-214AB, SMC (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Bidirectional Channels: 1 (functional equivalence)
Type: Zener (device classification)

Substitutes are divided into two functional groups based on peak pulse power rating:

Group A (3000W Peak Pulse Power): Parts with 84.4A to 84.6A peak pulse current, matching the original 3000W power dissipation specification. These include SMDJ22CA, SMC3K22CAHM3/57, SMC3K22CAHM3/9A, SMLJ22CA, and SMLJ22CAE3/TR13.

Group B (1500W Peak Pulse Power): Parts with 42.2A to 42.3A peak pulse current, providing reduced power dissipation at 1500W. These include SMCJ22CA, SMCJ22CA-TP, and SMCJ22CAE3/TR13.

All substitute parts maintain the 22V reverse standoff voltage and DO-214AB package specification. Clamping voltage variations (35.5V to 37.28V) fall within acceptable operating ranges for TVS diode applications.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	Status
SMDJ22C	Littelfuse Inc.	22	23.09	37.28	84.5	3000	DO-214AB, SMC	-65 ~ 150	Obsolete
SMDJ22CA	Alpha & Omega Semiconductor Inc.	22	24.4	35.5	84.6	3000	DO-214AB, SMC	-55 ~ 150	Active
SMC3K22CA-M3/9A	Vishay General Semiconductor	22	24.4	35.5	84.5	3000	DO-214AB, SMC	-55 ~ 150	Active
SMC3K22CAHM3/57	Vishay General Semiconductor	22	24.4	35.5	84.5	3000	DO-214AB, SMC	-55 ~ 150	Active
SMC3K22CAHM3/9A	Vishay General Semiconductor	22	24.4	35.5	84.5	3000	DO-214AB, SMC	-55 ~ 150	Active
SMCJ22CA	Meritek	22	24.4	35.5	42.25	1500	DO-214AB, SMC	-55 ~ 150	Active
SMCJ22CA-TP	Micro Commercial Co	22	24.4	35.5	42.3	1500	DO-214AB, SMC	-55 ~ 175	Active
SMCJ22CAE3/TR13	Microchip Technology	22	24.4	35.5	42.2	1500	DO-214AB, SMC	-65 ~ 150	Active
SMLJ22CA	Bourns Inc.	22	24.4	35.5	84.4	3000	DO-214AB, SMC	-55 ~ 150	Active
SMLJ22CA-TP	Micro Commercial Co	22	24.4	35.5	84.4	3000	DO-214AB, SMC	-55 ~ 175	Active
SMLJ22CAE3/TR13	Microchip Technology	22	24.4	35.5	84.4	3000	DO-214AB, SMC	-55 ~ 150	Active

Engineering Selection Recommendations

For 3000W Peak Pulse Power Applications:

Select from SMDJ22CA, SMC3K22CAHM3/57, SMC3K22CAHM3/9A, SMLJ22CA, SMLJ22CA-TP, or SMLJ22CAE3/TR13. These parts maintain electrical equivalence to the original SMDJ22C specification with 84.4A to 84.6A peak pulse current. All are active products with ROHS3 compliance. SMC3K22CAHM3/57 and SMC3K22CAHM3/9A carry AEC-Q101 automotive qualification, suitable for automotive-grade applications. SMLJ22CA-TP and SMCJ22CA-TP support extended operating temperatures to 175°C.

For 1500W Peak Pulse Power Applications:

Select from SMCJ22CA, SMCJ22CA-TP, or SMCJ22CAE3/TR13 when circuit design permits reduced power dissipation. These parts operate at 42.2A to 42.3A peak pulse current. SMCJ22CA-TP supports -55°C to 175°C operating range. SMCJ22CAE3/TR13 supports -65°C to 150°C, matching the original SMDJ22C lower temperature limit.

All substitute parts are active products with ROHS3 compliance and MSL 1 (unlimited moisture sensitivity). Selection should be based on specific application power requirements and thermal management capabilities.

Frequently Asked Questions (FAQ)

Q: Can I use a 1500W rated part (SMCJ series) as a direct replacement for the 3000W SMDJ22C?

A: Only if your circuit design and thermal analysis confirm that peak pulse power dissipation will not exceed 1500W. The 1500W parts (SMCJ22CA, SMCJ22CA-TP, SMCJ22CAE3/TR13) have identical electrical characteristics (22V standoff, 35.5V clamping) but lower current handling capacity (42.2A to 42.3A versus 84.5A). Use only when application requirements permit.

Q: What is the difference between SMC3K22CAHM3/57 and SMC3K22CAHM3/9A?

A: Both parts are electrically identical with 22V standoff voltage, 35.5V clamping voltage, and 84.5A peak pulse current in 3000W power rating. The suffix designations (57 and 9A) indicate different packaging or tape configurations. Verify packaging compatibility with your assembly equipment before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original SMDJ22C also meets ROHS3 requirements.

Q: Which substitute part has the widest operating temperature range?

A: SMCJ22CA-TP and SMLJ22CA-TP both support -55°C to 175°C operating range, providing 20°C higher maximum temperature than the original SMDJ22C (-65°C to 150°C). SMCJ22CAE3/TR13 matches the original lower temperature limit at -65°C.

Q: Can I mix different substitute parts in the same production run?

A: All listed substitutes maintain the same 22V reverse standoff voltage and DO-214AB package specification. However, verify that your circuit design accommodates the clamping voltage range (35.5V to 37.28V) and peak pulse current variations (42.2A to 84.6A) across different part selections. Maintain consistent part selection within individual assemblies to ensure predictable performance.

Q: What packaging options are available for these substitutes?

A: Most substitutes are available in Tape & Reel (TR) packaging for automated assembly. SMCJ22CA is available in bulk packaging. Verify specific packaging availability with your supplier before design finalization.

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