SMCJ40A-13 Equivalent & Substitute Parts

Part Overview

The SMCJ40A-13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the DO-214AB (SMC) surface mount package. This component is designed for general-purpose overvoltage protection with a 40V reverse standoff voltage and 64.5V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers that maintain the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	40V
Voltage - Breakdown (Min)	44.4V
Voltage - Clamping (Max) @ Ipp	64.5V
Current - Peak Pulse (10/1000µs)	23.2A
Power - Peak Pulse	1500W
Type	Zener
Unidirectional Channels	1
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ40A-13 is determined by the following critical parameters:

Mandatory Matching Parameters:

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

Allowable Variation Parameters:

Current - Peak Pulse (10/1000µs): Substitutes may exceed 23.2A (higher current capability is acceptable)
Power - Peak Pulse: Substitutes may exceed 1500W (higher power rating is acceptable)
Operating Temperature: Substitutes must support minimum -55°C and maximum 150°C; extended ranges are acceptable
Product Status: Active status preferred for long-term availability
RoHS Compliance: ROHS3 compliance preferred for regulatory alignment

Substitute parts meeting these criteria maintain electrical equivalence and mechanical compatibility with the original SMCJ40A-13 design.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status	RoHS Status
SMCJ40A-13	Diodes Incorporated	40V	44.4V	64.5V	23.2A	1500W	DO-214AB, SMC	Discontinued	Non-compliant
SMCJ40A	Meritek	40V	44.4V	64.5V	23.26A	1500W	DO-214AB, SMC	Active	ROHS3 Compliant
SMCJ40A-TR	STMicroelectronics	40V	44.4V	84V	119A (8/20µs)	1500W	DO-214AB, SMC	Active	ROHS3 Compliant
SMCJ40CA	MDD	40V	44.4V	64.5V	23.3A	1500W	DO-214AB, SMC	Active	ROHS3 Compliant
SMLJ40A-TP	Bourns Inc.	40V	44.4V	64.5V	46.4A	3000W	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ40A	Alpha & Omega Semiconductor Inc.	40V	44.4V	64.5V	46.6A	3000W	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ40A-HR	Littelfuse Inc.	40V	44.4V	64.5V	46.5A	3000W	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ40A	Taiwan Semiconductor Corporation	40V	44.4V	64.5V	77.6A	5000W	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ40A-T7	Littelfuse Inc.	40V	44.4V	64.5V	77.6A	5000W	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (1500W Power Rating):

SMCJ40A (Meritek) and SMCJ40CA (MDD) are direct replacements for the SMCJ40A-13. Both maintain identical voltage specifications (40V standoff, 44.4V breakdown, 64.5V clamping) and equivalent peak pulse current (23.26A and 23.3A respectively). Both parts are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Enhanced Performance Alternatives (3000W Power Rating):

SMLJ40A-TP (Bourns Inc.), SMDJ40A (Alpha & Omega Semiconductor Inc.), and SMDJ40A-HR (Littelfuse Inc.) provide identical voltage characteristics with doubled peak pulse current (46.4A to 46.6A) and doubled power dissipation capability (3000W). These parts are suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection profile.

High-Performance Alternatives (5000W Power Rating):

5.0SMDJ40A (Taiwan Semiconductor Corporation) and 5.0SMDJ40A-T7 (Littelfuse Inc.) deliver the same voltage specifications with significantly enhanced current handling (77.6A) and power dissipation (5000W). These options are appropriate for demanding applications with severe transient conditions.

Non-Equivalent Part:

SMCJ40A-TR (STMicroelectronics) exhibits a clamping voltage of 84V, which exceeds the specified 64.5V maximum. This part does not meet the mandatory clamping voltage requirement and is not suitable as a substitute.

All recommended substitutes are available in active production status with ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40A-TR be used as a substitute for SMCJ40A-13?

A: No. SMCJ40A-TR has a maximum clamping voltage of 84V, which exceeds the 64.5V specification required for the SMCJ40A-13. This difference affects circuit protection characteristics and makes it electrically incompatible.

Q: What is the difference between 1500W, 3000W, and 5000W rated parts?

A: Power rating indicates the maximum transient energy the device can dissipate. Parts with higher power ratings (3000W and 5000W) can handle larger transient pulses without thermal degradation. Selection depends on the expected transient energy in the application circuit.

Q: Are all substitute parts in the same DO-214AB package?

A: Yes. All listed substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original SMCJ40A-13 design.

Q: Why is ROHS3 compliance important?

A: ROHS3 compliance indicates the part meets current environmental and regulatory standards for hazardous substance restrictions. Parts with ROHS3 certification ensure compliance with modern procurement and manufacturing regulations.

Q: Can I use a higher current-rated part as a direct replacement?

A: Yes. Parts with higher peak pulse current ratings (46.4A to 77.6A) are electrically compatible substitutes. The higher current capability provides additional design margin without affecting the voltage protection characteristics.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Both are surface mount packaging formats. Tape & Reel (TR) is supplied on continuous tape for automated assembly. Cut Tape (CT) is supplied in shorter tape segments. Both formats are compatible with standard pick-and-place equipment; selection depends on production volume and assembly line requirements.

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