5KASMC40AHM3/57 Equivalent & Substitute Parts

Part Overview

The 5KASMC40AHM3/57 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AB (SMC) package and is designed for transient overvoltage protection applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KASMC40AHM3/57
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Package / Case	DO-214AB, SMC
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Power - Peak Pulse	5000W (5kW)
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 for the 5KASMC40AHM3/57 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Breakdown (Min): 44.4V
Voltage - Clamping (Max) @ Ipp: 64.5V
Package / Case: DO-214AB, SMC
Unidirectional Channels: 1
Type: Zener

Substitute parts are grouped into two categories based on power dissipation capability:

Category A - Full Power Rating (5000W): Parts maintaining the original 5000W peak pulse power specification. These provide direct functional equivalence with identical thermal performance.

Category B - Reduced Power Rating (1500W - 3000W): Parts with lower peak pulse power ratings. These maintain voltage specifications and package compatibility but operate at reduced power dissipation levels.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
5KASMC40AHM3/57	Vishay General Semiconductor - Diodes Division	40V	44.4V	64.5V	-	5000W (5kW)	DO-214AB, SMC	-65°C ~ 185°C (TJ)	Obsolete
5KASMC40AHM3_A/H	Vishay General Semiconductor - Diodes Division	40V	44.4V	64.5V	77.5A	5000W (5kW)	DO-214AB, SMC	-65°C ~ 185°C (TJ)	Active
5.0SMDJ40A	Taiwan Semiconductor Corporation	40V	44.4V	64.5V	77.6A	5000W (5kW)	DO-214AB, SMC	-55°C ~ 175°C (TJ)	Active
5.0SMDJ40A-T7	Littelfuse Inc.	40V	44.4V	64.5V	77.6A	5000W (5kW)	DO-214AB, SMC	-65°C ~ 150°C (TJ)	Active
SMCJ40A	Meritek	40V	44.4V	64.5V	23.26A	1500W (1.5kW)	DO-214AB, SMC	-55°C ~ 150°C	Active
SMCJ40A-HR	Littelfuse Inc.	40V	44.4V	64.5V	23.3A	1500W (1.5kW)	DO-214AB, SMC	-65°C ~ 150°C (TJ)	Active
SMCJ40A-HRA	Littelfuse	40V	44.4V	64.5V	23.3A	1500W (1.5kW)	DO-214AB, SMC	-65°C ~ 150°C (TJ)	Active
SMCJ40A-HRAT7	Littelfuse	40V	44.4V	64.5V	23.3A	1500W (1.5kW)	DO-214AB, SMC	-65°C ~ 150°C (TJ)	Active
SMDJ40A	Alpha & Omega Semiconductor Inc.	40V	44.4V	64.5V	46.6A	3000W (3kW)	DO-214AB, SMC	-55°C ~ 150°C (TJ)	Active

Engineering Selection Recommendations

Primary Substitutes (Full Equivalence):

5KASMC40AHM3_A/H, 5.0SMDJ40A, and 5.0SMDJ40A-T7 maintain the complete electrical specification of the original part, including 5000W peak pulse power rating and voltage parameters. All three are active products with current manufacturing status. 5KASMC40AHM3_A/H is the direct Vishay equivalent with identical operating temperature range (-65°C ~ 185°C). 5.0SMDJ40A and 5.0SMDJ40A-T7 are cross-manufacturer alternatives with minor operating temperature variations.

Secondary Substitutes (Reduced Power Rating):

SMCJ40A, SMCJ40A-HR, SMCJ40A-HRA, SMCJ40A-HRAT7, and SMDJ40A maintain voltage specifications and package compatibility but operate at reduced power dissipation levels (1500W to 3000W). These are suitable for applications where peak pulse power requirements do not exceed their respective ratings. All are active products with established supply availability.

Compliance Considerations:

The original part carries Automotive grade and AEC-Q101 qualification. Among substitutes, 5KASMC40AHM3_A/H maintains automotive qualification. Other substitutes are classified as general purpose or telecom applications. Selection should account for application-specific compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40A series parts directly replace the 5KASMC40AHM3/57?

A: SMCJ40A series parts are electrically compatible for voltage specifications (40V standoff, 64.5V clamping) and use the same DO-214AB package. However, they operate at 1500W peak pulse power versus the original 5000W specification. Selection depends on whether your circuit design requires the full 5000W power rating or can operate within the 1500W limit.

Q: What is the difference between 5.0SMDJ40A and 5.0SMDJ40A-T7?

A: Both parts are functionally equivalent with identical electrical specifications and 5000W power rating. The primary difference is packaging: 5.0SMDJ40A is supplied in Tape & Reel format, while 5.0SMDJ40A-T7 is supplied in Cut Tape & Digi-Reel format. Selection is based on your procurement and assembly process requirements.

Q: Is the operating temperature range critical for substitution?

A: The original part operates from -65°C to 185°C. Most substitutes operate within -55°C to 150°C or -65°C to 150°C ranges. If your application requires the full -65°C to 185°C range, 5KASMC40AHM3_A/H is the only substitute maintaining this specification.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the original part's environmental compliance status.

Q: What does the "-HR" or "-HRA" designation indicate in Littelfuse part numbers?

A: These designations indicate specific product variants within the Littelfuse SMCJ series. Both SMCJ40A-HR and SMCJ40A-HRA maintain identical electrical specifications and are functionally interchangeable for the 40V/64.5V clamping voltage application.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message