3KASMC22AHM3_A/I Equivalent & Substitute Parts

Part Overview

The 3KASMC22AHM3_A/I 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 76.1A, delivering 3000W peak pulse power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across -65°C to 185°C junction temperature range.

The 3KASMC22AHM3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers with comparable electrical characteristics and identical package specifications, enabling direct replacement in existing designs.

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)	76.1	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 3KASMC22AHM3_A/I is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 22V
Voltage - Breakdown (Min): 24.4V
Package / Case: DO-214AB, SMC
Unidirectional configuration (1 channel)
Surface mount mounting type

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 35.5V to 48.3V (lower or equal clamping voltage acceptable for enhanced protection margin)
Current - Peak Pulse (10/1000µs): 42.2A to 207A (higher current rating acceptable for improved transient handling)
Power - Peak Pulse: 1500W to 5000W (higher power rating acceptable)
Operating Temperature Range: -55°C to 175°C minimum acceptable (original part extends to -65°C and 185°C)
Product Status: Active or Discontinued (both acceptable for substitution)
Manufacturer: Multiple qualified sources acceptable

All substitute parts maintain identical voltage standoff and breakdown specifications, ensuring circuit protection threshold compatibility. Variations in clamping voltage, peak current, and power dissipation represent enhanced or equivalent performance characteristics suitable for direct replacement.

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
3KASMC22AHM3_A/I	Vishay	22	24.4	39.4	76.1	3000	-65 to 185	Obsolete
3KASMC22AHM3_B/I	Vishay	22	24.4	35.5	84.5	3000	-65 to 185	Active
3.0SMCJ22A-13	Diodes Incorporated	22	24.4	35.5	84.5	3000	-55 to 175	Discontinued
5.0SMDJ22A	Taiwan Semiconductor Corporation	22	24.4	35.5	141	5000	-55 to 175	Active
SMCJ22A	Fairchild Semiconductor	22	24.4	35.5	42.3	1500	-55 to 150	Active
SMCJ22A-13-F	Diodes Incorporated	22	24.4	35.5	42.2	1500	-55 to 150	Active
SMCJ22A-HR	Littelfuse Inc.	22	24.4	35.5	42.3	1500	-65 to 150	Active
SMCJ22A-HRA	Littelfuse Inc.	22	24.4	35.5	42.3	1500	-65 to 150	Active
SMCJ22A-HRAT7	Littelfuse Inc.	22	24.4	35.5	42.3	1500	-65 to 150	Active
SMCJ22A-TR	STMicroelectronics	22	24.4	48.3	207	1500	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Preferred): The 3KASMC22AHM3_B/I from Vishay is the direct successor to the obsolete 3KASMC22AHM3_A/I. Both parts share identical voltage specifications, automotive AEC-Q101 qualification, extended temperature range (-65°C to 185°C), and ROHS3 compliance. The B/I variant offers improved peak pulse current (84.5A vs 76.1A) while maintaining the same 3000W power dissipation and package configuration.

Active Alternatives with Equivalent Performance: The 5.0SMDJ22A from Taiwan Semiconductor Corporation provides enhanced specifications with 141A peak pulse current and 5000W power dissipation, offering superior transient protection margin. This part maintains active product status and full compliance with RoHS3 and REACH requirements.

Littelfuse SMCJ-HR and SMCJ-HRA Series: The SMCJ22A-HR, SMCJ22A-HRA, and SMCJ22A-HRAT7 variants from Littelfuse maintain the extended lower temperature limit (-65°C) matching the original part's automotive grade specification. These parts are actively produced and widely available.

Standard SMCJ22A Variants: The SMCJ22A from Fairchild Semiconductor and SMCJ22A-13-F from Diodes Incorporated provide cost-effective alternatives with active product status. These parts operate within -55°C to 150°C range, suitable for applications not requiring the full -65°C lower temperature specification.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical DO-214AB (SMC) package specifications, enabling direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 3KASMC22AHM3_A/I with any of the listed parts? A: Yes. All listed parts share identical voltage standoff (22V) and breakdown (24.4V) specifications, identical DO-214AB (SMC) package, and unidirectional configuration. Electrical and mechanical compatibility is confirmed for direct substitution.

Q: What is the difference between the original part and the 3KASMC22AHM3_B/I? A: The B/I variant is the active production successor. Both parts are manufactured by Vishay with identical voltage ratings, automotive qualification, and extended temperature range. The B/I offers higher peak pulse current (84.5A vs 76.1A) while maintaining 3000W power dissipation.

Q: Which substitute offers the best protection margin? A: The 5.0SMDJ22A provides the highest peak pulse current (141A) and power dissipation (5000W), delivering enhanced transient suppression capability. This part is actively produced and maintains full compliance certifications.

Q: Are there temperature range considerations for substitution? A: The original part operates -65°C to 185°C. The 3KASMC22AHM3_B/I and Littelfuse SMCJ-HR variants maintain this extended range. Standard SMCJ22A variants operate -55°C to 150°C, acceptable for applications not requiring the full temperature specification.

Q: Do all substitutes maintain automotive qualification? A: The 3KASMC22AHM3_B/I maintains AEC-Q101 automotive qualification identical to the original part. Other substitutes are qualified for general purpose applications. Automotive-specific designs should prioritize the Vishay B/I variant or verify alternative manufacturer automotive certifications.

Q: Is packaging identical across all substitutes? A: Yes. All substitute parts use DO-214AB (SMC) surface mount package with identical PCB footprint and land pattern. No layout modifications are required for substitution.

Q: What is the difference between SMCJ22A-HR, SMCJ22A-HRA, and SMCJ22A-HRAT7? A: All three Littelfuse variants share identical electrical specifications (22V standoff, 35.5V clamping, 42.3A peak current, 1500W power). The designations reflect different packaging or tape configurations. Electrical performance is equivalent for circuit design purposes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message