SMAJ40CA-M3/5A Equivalent & Substitute Parts

Part Overview

The SMAJ40CA-M3/5A is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode is designed for general-purpose transient voltage suppression in surface-mount applications using the DO-214AC (SMA) package. The part is active and ROHS3 compliant, with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the TVS diode category.

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
Bidirectional Channels	1	—
Type	Zener	—
Package / Case	DO-214AC, SMA	—
Operating Temperature	-55°C ~ 150°C	TJ
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ40CA-M3/5A are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

Primary Matching 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
Bidirectional Channels: 1
Type: Zener
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Direct Equivalents maintain identical electrical specifications and packaging. These parts are interchangeable without circuit modification.

Functional Equivalents share the same reverse standoff voltage, breakdown voltage, and clamping voltage but may differ in peak pulse current or power dissipation. These parts are suitable for applications where the specified electrical characteristics are the primary design constraint.

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	Package / Case	Operating Temperature	RoHS Status	Packaging Type
SMAJ40CA-M3/5A	Vishay General Semiconductor - Diodes Division	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Tape & Reel (TR)
SMAJ40CA-E3/61	Vishay General Semiconductor - Diodes Division	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Cut Tape (CT)
ATV04A400JB-HF	Comchip Technology	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Tape & Reel (TR)
SMAJ40CA	Good-Ark Semiconductor	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SMAJ40CA-13-F	Diodes Incorporated	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SMAJ40CA-TP	Micro Commercial Co	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-55°C ~ 175°C (TA)	ROHS3 Compliant	Tape & Reel (TR)
SZ1SMA40CAT3G	Littelfuse Inc.	40V	44.4V	64.5V	6.2A	400W	DO-214AC, SMA	-65°C ~ 150°C (TJ)	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SM4T47CAY	STMicroelectronics	40V	44.4V	84V	27A (8/20µs)	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SMA6J40CA-TR	STMicroelectronics	40V	44.4V	73.6V	48A (8/20µs)	600W	DO-214AC, SMA	-55°C ~ 175°C (TJ)	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SMA6T47CAY	STMicroelectronics	40V	44.4V	73.6V	48A (8/20µs)	600W	DO-214AC, SMA	-40°C ~ 150°C (TJ)	ROHS3 Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Specifications):

The following parts are direct equivalents with matching voltage clamping (64.5V), peak pulse current (6.2A), and power dissipation (400W):

SMAJ40CA-E3/61 (Vishay) — Available in Cut Tape packaging; 36,200 pcs in stock
ATV04A400JB-HF (Comchip Technology) — AEC-Q101 automotive qualified; 5,572 pcs in stock
SMAJ40CA (Good-Ark Semiconductor) — Available in Cut Tape and Digi-Reel packaging; 19,800 pcs in stock
SMAJ40CA-13-F (Diodes Incorporated) — Available in Cut Tape and Digi-Reel packaging; 18,323 pcs in stock
SMAJ40CA-TP (Micro Commercial Co) — Extended operating temperature range (-55°C ~ 175°C); 32,081 pcs in stock
SZ1SMA40CAT3G (Littelfuse Inc.) — AEC-Q101 automotive qualified; extended lower temperature range (-65°C ~ 150°C); 2,265 pcs in stock

Functional Equivalents (Higher Performance Characteristics):

The following parts share the same reverse standoff voltage (40V) and breakdown voltage (44.4V) but provide higher clamping voltage and peak pulse current:

SM4T47CAY (STMicroelectronics) — 84V clamping voltage, 27A peak pulse current (8/20µs), AEC-Q101 automotive qualified; 5,345 pcs in stock
SMA6J40CA-TR (STMicroelectronics) — 73.6V clamping voltage, 48A peak pulse current (8/20µs), 600W power dissipation, extended operating temperature (-55°C ~ 175°C); 70,290 pcs in stock
SMA6T47CAY (STMicroelectronics) — 73.6V clamping voltage, 48A peak pulse current (8/20µs), 600W power dissipation, AEC-Q101 automotive qualified; 26,705 pcs in stock

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Selection should be based on packaging requirements (Tape & Reel vs. Cut Tape), operating temperature range, and automotive qualification needs.

Frequently Asked Questions (FAQ)

Q: Can SMAJ40CA-E3/61 be used as a direct replacement for SMAJ40CA-M3/5A?

A: Yes. Both parts share identical electrical specifications (40V reverse standoff, 64.5V clamping voltage, 6.2A peak pulse current, 400W power dissipation) and the same DO-214AC (SMA) package. The difference is packaging format: SMAJ40CA-M3/5A is supplied in Tape & Reel, while SMAJ40CA-E3/61 is supplied in Cut Tape.

Q: What is the difference between direct equivalents and functional equivalents?

A: Direct equivalents maintain identical voltage clamping (64.5V) and peak pulse current (6.2A) specifications. Functional equivalents share the same reverse standoff voltage (40V) and breakdown voltage (44.4V) but provide higher clamping voltage and peak pulse current ratings. Functional equivalents are suitable for applications requiring enhanced transient suppression capability.

Q: Are automotive-qualified parts (AEC-Q101) interchangeable with non-automotive parts?

A: Automotive-qualified parts (ATV04A400JB-HF, SZ1SMA40CAT3G, SM4T47CAY, SMA6T47CAY) meet additional qualification standards but are electrically compatible with non-automotive equivalents. Selection depends on application requirements and qualification mandates.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution compatibility. However, application requirements may mandate specific temperature ranges. SMAJ40CA-TP, SMA6J40CA-TR, and SMA6T47CAY offer extended upper temperature limits (-55°C ~ 175°C or -40°C ~ 150°C), while SZ1SMA40CAT3G extends the lower limit to -65°C.

Q: Can higher-performance parts (SM4T47CAY, SMA6J40CA-TR, SMA6T47CAY) be used in place of SMAJ40CA-M3/5A?

A: Yes, with circuit verification. These parts maintain the same reverse standoff voltage (40V) and breakdown voltage (44.4V) but provide higher clamping voltage and peak pulse current. They are suitable for applications requiring enhanced transient suppression but require confirmation that higher clamping voltage does not adversely affect downstream components.

Q: What packaging options are available for equivalent parts?

A: Equivalent parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. SMAJ40CA-M3/5A is supplied in Tape & Reel. Cut Tape alternatives include SMAJ40CA-E3/61, SMAJ40CA, SMAJ40CA-13-F, and SZ1SMA40CAT3G. Tape & Reel alternatives include ATV04A400JB-HF, SMAJ40CA-TP, SM4T47CAY, and SMA6T47CAY.

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