SMAJ40CA-M3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ40CA-M3/61 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AC (SMA) package and is designed for general-purpose transient voltage suppression applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AC package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	6.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—
Type	Zener	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ40CA-M3/61 are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must meet the following requirements:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Breakdown (Min): 44.4V
Voltage - Clamping (Max) @ Ipp: 64.5V
Current - Peak Pulse (10/1000µs): 6.2A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener
RoHS Status: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Direct Equivalents maintain identical electrical specifications and differ only in packaging format (Tape & Reel vs. Cut Tape) or manufacturer designation suffix.

Functional Equivalents maintain core voltage and current parameters but may include extended temperature ranges or automotive-grade qualifications that provide enhanced reliability without altering primary electrical performance.

Higher-Performance Alternatives exceed the clamping voltage or peak pulse current specifications, suitable for applications requiring additional margin or enhanced transient suppression capability.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Breakdown Min (V)	Voltage Clamp Max (V)	Peak Pulse Current (A)	Peak Power (W)	Package	Temp Range (°C)	RoHS
SMAJ40CA-M3/61	Vishay	40	44.4	64.5	6.2	400	DO-214AC	-55 to 150	ROHS3
SMAJ40CA-E3/61	Vishay	40	44.4	64.5	6.2	400	DO-214AC	-55 to 150	ROHS3
SMAJ40CA-TP	Micro Commercial Co	40	44.4	64.5	6.2	400	DO-214AC	-55 to 175	ROHS3
SMAJ40CA	Good-Ark Semiconductor	40	44.4	64.5	6.2	400	DO-214AC	-55 to 150	ROHS3
SMAJ40CA-13-F	Diodes Incorporated	40	44.4	64.5	6.2	400	DO-214AC	-55 to 150	ROHS3
ATV04A400JB-HF	Comchip Technology	40	44.4	64.5	6.2	400	DO-214AC	-55 to 150	ROHS3
SZ1SMA40CAT3G	Littelfuse Inc.	40	44.4	64.5	6.2	400	DO-214AC	-65 to 150	ROHS3
SMA6T47CAY	STMicroelectronics	40	44.4	73.6	48	600	DO-214AC	-40 to 150	ROHS3
SM4T47CAY	STMicroelectronics	40	44.4	84	27	400	DO-214AC	-55 to 150	ROHS3
SMA6J40CA-TR	STMicroelectronics	40	44.4	73.6	48	600	DO-214AC	-55 to 175	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

SMAJ40CA-E3/61, SMAJ40CA, SMAJ40CA-13-F, and ATV04A400JB-HF are direct electrical equivalents to the SMAJ40CA-M3/61. These parts maintain identical voltage standoff, breakdown, clamping, and peak pulse specifications. Selection among these options depends on packaging format availability (Tape & Reel vs. Cut Tape) and supply chain requirements. ATV04A400JB-HF includes automotive-grade qualification (AEC-Q101) and is suitable for automotive applications requiring enhanced reliability documentation.

Extended Temperature Substitute:

SMAJ40CA-TP (Micro Commercial Co) provides identical electrical specifications with an extended upper operating temperature of 175°C compared to the standard 150°C. This part is suitable for applications in elevated ambient temperature environments while maintaining all other electrical parameters.

Automotive-Grade Alternatives:

SZ1SMA40CAT3G (Littelfuse Inc.) and ATV04A400JB-HF (Comchip Technology) both carry AEC-Q101 automotive qualification. SZ1SMA40CAT3G extends the lower operating temperature to -65°C. These parts are appropriate for automotive and industrial applications requiring formal qualification documentation.

Higher-Performance Alternatives:

SMA6T47CAY and SMA6J40CA-TR (STMicroelectronics) provide enhanced transient suppression with higher clamping voltages (73.6V) and significantly increased peak pulse current (48A) and power dissipation (600W). SM4T47CAY offers intermediate performance with 84V clamping and 27A peak pulse current. These alternatives are suitable for applications requiring greater transient energy absorption or higher fault current handling.

Frequently Asked Questions (FAQ)

Q: Can SMAJ40CA-E3/61 replace SMAJ40CA-M3/61 directly?

A: Yes. SMAJ40CA-E3/61 is a direct electrical equivalent with identical voltage standoff (40V), breakdown (44.4V), clamping (64.5V), peak pulse current (6.2A), and power dissipation (400W) specifications. The difference is packaging format: SMAJ40CA-M3/61 is supplied in Tape & Reel format, while SMAJ40CA-E3/61 is supplied in Cut Tape format. Both use the DO-214AC (SMA) package.

Q: What is the difference between SMAJ40CA-TP and the original part?

A: SMAJ40CA-TP maintains identical electrical specifications but extends the maximum operating temperature from 150°C to 175°C. This makes it suitable for high-temperature applications while preserving all voltage and current performance parameters.

Q: When should I use SMA6T47CAY or SMA6J40CA-TR instead of the original SMAJ40CA-M3/61?

A: These STMicroelectronics parts provide higher performance with 73.6V clamping voltage, 48A peak pulse current, and 600W power dissipation compared to the original 64.5V, 6.2A, and 400W. Use these alternatives when your application requires greater transient energy absorption, higher fault current handling, or enhanced suppression margin.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMAJ40CA-M3/61 environmental and regulatory specifications.

Q: What is the difference between automotive-grade parts like ATV04A400JB-HF and standard parts?

A: Automotive-grade parts carry AEC-Q101 qualification, indicating compliance with automotive industry reliability and testing standards. These parts are suitable for automotive and mission-critical applications requiring formal qualification documentation. Electrical specifications remain identical to standard equivalents.

Q: Can I use SM4T47CAY as a direct replacement?

A: SM4T47CAY is not a direct replacement. While it maintains the 40V standoff voltage and 400W power rating, it features a higher clamping voltage (84V) and significantly higher peak pulse current (27A). Use this part only if your application requires higher transient suppression capability or can tolerate the higher clamping voltage.

Q: Do all substitute parts use the same DO-214AC (SMA) package?

A: Yes. All substitute parts listed use the DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility with the original SMAJ40CA-M3/61 design.

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