1SMA43CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMA43CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 400W peak pulse power rating in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA43CAT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	43V
Voltage - Breakdown (Min)	47.8V
Voltage - Clamping (Max) @ Ipp	69.4V
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 1SMA43CAT3 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 43V
Voltage - Breakdown (Min): 47.8V
Voltage - Clamping (Max) @ Ipp: 69.4V or higher
Power - Peak Pulse: 400W or higher
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Bidirectional Channels: 1

Substitute parts are grouped into two categories based on clamping voltage characteristics:

Group 1 - Direct Electrical Match (69.4V Clamp): Parts with identical clamping voltage specifications, ensuring drop-in compatibility with minimal circuit impact.

Group 2 - Higher Clamping Voltage (91V Clamp): Parts with elevated clamping voltage, suitable for applications where higher transient suppression thresholds are acceptable.

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
1SMA43CAT3	onsemi	43V	47.8V	69.4V	—	400W	DO-214AC (SMA)	Obsolete	RoHS non-compliant
SMAJ43CA	Good-Ark Semiconductor	43V	47.8V	69.4V	5.8A	400W	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA-TR	STMicroelectronics	43V	47.8V	91V	25A (8/20µs)	400W	DO-214AC (SMA)	Active	ROHS3 Compliant
SM4T50CAY	STMicroelectronics	43V	47.8V	91V	25A (8/20µs)	400W	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA-13-F	Diodes Incorporated	43V	47.8V	69.4V	5.7A	400W	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CA-TP	Micro Commercial Co	43V	47.8V	69.4V	5.7A	400W	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ43CAE3/TR13	Microchip Technology	43V	47.8V	69.4V	7.2A	500W	DO-214AC (SMA)	Active	ROHS3 Compliant
TV04A430JB-G	Comchip Technology	43V	47.8V	69.4V	5.76A	400W	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliance: All substitute parts listed are ROHS3 compliant, addressing the non-compliance status of the original 1SMA43CAT3. Selection among compliant alternatives depends on clamping voltage requirements and peak pulse current specifications.

For Direct Electrical Replacement (69.4V Clamp): SMAJ43CA (Good-Ark Semiconductor), SMAJ43CA-13-F (Diodes Incorporated), SMAJ43CA-TP (Micro Commercial Co), SMAJ43CAE3/TR13 (Microchip Technology), and TV04A430JB-G (Comchip Technology) provide equivalent clamping voltage performance. SMAJ43CAE3/TR13 offers enhanced power rating (500W) and higher peak pulse current (7.2A).

For Higher Transient Suppression (91V Clamp): SMAJ43CA-TR (STMicroelectronics) and SM4T50CAY (STMicroelectronics) provide elevated clamping voltage with significantly higher peak pulse current (25A at 8/20µs). SM4T50CAY includes AEC-Q101 automotive qualification.

For Production Continuity: SMAJ43CA (Good-Ark Semiconductor) offers the highest inventory availability (15,200 pcs) among active alternatives, supporting sustained production requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ43CA-TR or SM4T50CAY be used as direct replacements for 1SMA43CAT3?

A: Both parts maintain the 43V reverse standoff voltage and DO-214AC package, but feature 91V clamping voltage compared to the original 69.4V. They are electrically compatible in applications where higher clamping voltage is acceptable. The elevated clamping threshold may affect circuit protection characteristics in sensitive applications.

Q: What is the difference between parts with 69.4V and 91V clamping voltage?

A: The 69.4V clamping voltage parts (SMAJ43CA, SMAJ43CA-13-F, SMAJ43CA-TP, SMAJ43CAE3/TR13, TV04A430JB-G) suppress transients at lower voltage levels, providing tighter protection. The 91V clamping voltage parts (SMAJ43CA-TR, SM4T50CAY) allow higher transient peaks before suppression, suitable for applications with higher voltage tolerance.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use DO-214AC (SMA) surface mount packaging, matching the original 1SMA43CAT3. Packaging variations exist only in tape and reel configurations (Cut Tape, Digi-Reel, Tape & Reel), which do not affect component functionality or PCB assembly compatibility.

Q: Which substitute part offers the best performance upgrade?

A: SMAJ43CAE3/TR13 (Microchip Technology) provides enhanced specifications with 500W peak pulse power (versus 400W) and 7.2A peak pulse current, while maintaining 69.4V clamping voltage. This part offers improved transient handling capability within the same electrical protection window.

Q: Is automotive qualification required for substitution?

A: Automotive qualification (AEC-Q101) is available only with SM4T50CAY (STMicroelectronics). Selection of automotive-qualified parts depends on application requirements. All listed substitutes meet RoHS3 compliance regardless of automotive qualification status.

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