Equivalent & Substitute Parts for 3KASMC22HE3_A/H

Part Overview

The 3KASMC22HE3_A/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 22V reverse standoff voltage with a 39.4V maximum clamping voltage. This component is designed for surface mount applications in the DO-214AB (SMC) package and is qualified to AEC-Q101 automotive standards. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KASMC22HE3_A/H
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Package / Case	DO-214AB, SMC
Voltage - Reverse Standoff (Typ)	22V
Voltage - Breakdown (Min)	24.4V
Voltage - Clamping (Max) @ Ipp	39.4V
Current - Peak Pulse (10/1000µs)	76.1A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3KASMC22HE3_A/H is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Package / Case: DO-214AB, SMC (surface mount compatibility)
Unidirectional channel configuration: 1 channel
Mounting Type: Surface Mount

Substitute parts must maintain the same reverse standoff voltage (22V) and breakdown voltage (24.4V minimum) to ensure circuit protection at the intended threshold. The DO-214AB SMC package is mandatory for PCB compatibility. All listed substitutes meet these core electrical and mechanical requirements.

Variations in clamping voltage, peak pulse current, and power dissipation are acceptable within the substitute group, as these parameters define the suppression performance envelope rather than the protection threshold. Parts with higher current ratings or power dissipation provide enhanced transient suppression capability without compromising circuit compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package / Case
3KASMC22HE3_A/H	Vishay General Semiconductor - Diodes Division	22V	24.4V	39.4V	76.1A	3000W	-65°C ~ 185°C	Obsolete	DO-214AB, SMC
3KASMC22AHE3_B/H	Vishay General Semiconductor - Diodes Division	22V	24.4V	35.5V	84.5A	3000W	-65°C ~ 185°C	Active	DO-214AB, SMC
5.0SMDJ22A	Taiwan Semiconductor Corporation	22V	24.4V	35.5V	141A	5000W	-55°C ~ 175°C	Active	DO-214AB, SMC
SMCJ22A	Fairchild Semiconductor	22V	24.4V	35.5V	42.3A	1500W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMCJ22A-13-F	Diodes Incorporated	22V	24.4V	35.5V	42.2A	1500W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMCJ22A-HRA	Littelfuse Inc.	22V	24.4V	35.5V	42.3A	1500W	-65°C ~ 150°C	Active	DO-214AB, SMC
SMCJ22A-HRAT7	Littelfuse Inc.	22V	24.4V	35.5V	42.3A	1500W	-65°C ~ 150°C	Active	DO-214AB, SMC
SMCJ22A-TR	STMicroelectronics	22V	24.4V	48.3V	207A (8/20µs)	1500W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMDJ22A	Alpha & Omega Semiconductor Inc.	22V	24.4V	35.5V	84.6A	3000W	-55°C ~ 150°C	Active	DO-214AB, SMC
SMDJ22A-HR	Littelfuse Inc.	22V	24.4V	35.5V	84.5A	3000W	-65°C ~ 150°C	Active	DO-214AB, SMC

Engineering Selection Recommendations

All substitute parts listed maintain the core electrical specifications (22V reverse standoff, 24.4V minimum breakdown voltage) and are compatible with the DO-214AB SMC package footprint. Selection should be based on the following criteria:

For Automotive Applications: The 3KASMC22AHE3_B/H is the direct Vishay equivalent and maintains AEC-Q101 qualification with identical operating temperature range (-65°C ~ 185°C). This part is the preferred substitute for designs requiring automotive-grade compliance.

For Extended Temperature Range: The SMCJ22A-HRA and SMCJ22A-HRAT7 (Littelfuse) and SMDJ22A-HR (Littelfuse) support the lower temperature limit of -65°C, matching the original part's thermal specification. These are suitable for automotive and harsh environment applications.

For Higher Power Dissipation: The 5.0SMDJ22A (Taiwan Semiconductor Corporation) provides 5000W peak pulse power, exceeding the original 3000W specification. This part is appropriate for applications requiring enhanced transient suppression margin.

For Standard Industrial Applications: The SMCJ22A (Fairchild Semiconductor), SMCJ22A-13-F (Diodes Incorporated), and SMDJ22A (Alpha & Omega Semiconductor Inc.) are active production parts with -55°C ~ 150°C operating range, suitable for non-automotive applications with standard environmental requirements.

All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower peak pulse current rating than the original 3KASMC22HE3_A/H?

A: Yes. The SMCJ22A series (42.3A peak pulse) and SMCJ22A-13-F (42.2A peak pulse) are valid substitutes. Lower current ratings indicate reduced transient suppression capability but maintain the same voltage protection threshold (22V standoff, 24.4V breakdown). Selection depends on the actual transient energy in your circuit. If the original design margin was substantial, lower-rated parts are acceptable.

Q: What is the difference between the clamping voltage variations (35.5V, 39.4V, 48.3V) in the substitute list?

A: Clamping voltage defines the maximum voltage across the diode during transient suppression. The original part clamps at 39.4V maximum. Substitutes with 35.5V clamping provide tighter voltage control (lower peak voltage), while the SMCJ22A-TR at 48.3V allows higher peak voltage. All maintain the same 22V standoff threshold. Selection depends on downstream component voltage ratings and transient energy absorption requirements.

Q: Is the 3KASMC22AHE3_B/H a direct replacement for the obsolete 3KASMC22HE3_A/H?

A: Yes. The 3KASMC22AHE3_B/H is manufactured by the same supplier (Vishay) and maintains identical voltage specifications, operating temperature range (-65°C ~ 185°C), automotive qualification (AEC-Q101), and DO-214AB SMC package. The primary difference is active product status and slightly lower clamping voltage (35.5V vs. 39.4V), which provides improved transient suppression performance.

Q: Can I substitute a part with a higher operating temperature minimum (e.g., -55°C instead of -65°C)?

A: This depends on your application's minimum operating temperature requirement. If your circuit operates above -55°C, parts like SMCJ22A, SMCJ22A-13-F, SMCJ22A-TR, and SMDJ22A are acceptable. For applications requiring -65°C operation, select SMCJ22A-HRA, SMCJ22A-HRAT7, SMDJ22A-HR, or the 3KASMC22AHE3_B/H.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitutes use the DO-214AB SMC surface mount package, ensuring PCB footprint compatibility. Packaging options vary by supplier (Tape & Reel, Bulk), but the physical component dimensions and lead configuration are identical.

Q: What is the significance of the "-HR" suffix in Littelfuse part numbers?

A: The "-HR" designation indicates a high-reliability variant. These parts (SMCJ22A-HRA, SMCJ22A-HRAT7, SMDJ22A-HR) meet enhanced reliability standards and support the extended lower temperature limit of -65°C, making them suitable for automotive and mission-critical applications.

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