SMBJ43CA-M3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ43CA-M3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the 43V reverse standoff category and is designed for general-purpose transient voltage suppression in surface-mount applications. The device is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when electrical parameters and mechanical specifications align within the allowable tolerances for this TVS diode category, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	69.4	V
Current - Peak Pulse (10/1000µs)	8.6	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ43CA-M3/5B is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 43V
Voltage - Clamping (Max) @ Ipp: 69.4V
Current - Peak Pulse (10/1000µs): 8.6A (±0.1A tolerance)
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1

Secondary Compatibility Factors:

Product Status: Active
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)
Operating Temperature Range: Minimum -55°C to 150°C

Parts are grouped into three categories:

Group 1 - Direct Electrical Equivalents (Identical Parameters): SMBJ43CA-E3/52, SMBJ43CA-E3/5B, SMBJ43CA-TP. These parts maintain all critical electrical specifications and differ only in packaging designation or manufacturer variant coding.

Group 2 - Functional Equivalents (Vishay/Diodes Inc. Variants): SMBJ43CA-13-F. This part is manufactured by Diodes Incorporated and maintains identical electrical specifications with SMB package designation.

Group 3 - Near-Equivalent Alternatives (Voltage/Current Variance): SMBJ40CA, SMBJ43CA (MDD), SMBJ45CA, SMBJ48CA. These parts operate within the same TVS diode family but with different voltage ratings or peak current specifications, suitable only when circuit design permits voltage or current tolerance variation.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Inventory (Pcs)
SMBJ43CA-M3/5B	Vishay	43	69.4	8.6	600	-55 to 150	DO-214AA	998
SMBJ43CA-E3/52	Vishay	43	69.4	8.6	600	-55 to 150	DO-214AA	45300
SMBJ43CA-E3/5B	Vishay	43	69.4	8.6	600	-55 to 150	DO-214AA	4088
SMBJ43CA-13-F	Diodes Inc.	43	69.4	8.6	600	-55 to 150	SMB	90300
SMBJ43CA-TP	Micro Commercial Co	43	69.4	8.6	600	-55 to 175	DO-214AA	3362
SMBJ43CA	MDD	43	69.4	8.7	600	-50 to 150	SMB/DO-214AA	17100
SMBJ40CA	MDD	40	64.5	9.3	600	-50 to 150	SMB/DO-214AA	10200
SMBJ45CA	MDD	45	72.7	8.3	600	-50 to 150	SMB/DO-214AA	17200
SMBJ48CA	MDD	48	77.4	7.8	600	-50 to 150	SMB/DO-214AA	5539

Engineering Selection Recommendations

Tier 1 - Direct Replacement (No Design Modification Required):

SMBJ43CA-E3/52, SMBJ43CA-E3/5B, and SMBJ43CA-TP are direct electrical and mechanical equivalents. All three maintain identical voltage ratings (43V reverse standoff, 69.4V clamping), peak pulse current (8.6A), and power dissipation (600W). All are ROHS3 compliant with MSL 1 rating. Selection among these three is based on inventory availability and lead time. SMBJ43CA-E3/52 offers the highest inventory (45,300 pcs), making it the preferred choice for volume procurement.

Tier 2 - Cross-Manufacturer Equivalent (Verified Compatibility):

SMBJ43CA-13-F (Diodes Incorporated) and SMBJ43CA (MDD) maintain the critical 43V/69.4V specifications with identical power rating. Both are Active status and ROHS3 compliant. The SMBJ43CA-13-F variant from Diodes Incorporated has superior inventory availability (90,300 pcs). The MDD variant shows a minor peak pulse current specification of 8.7A versus 8.6A, which falls within acceptable tolerance for general-purpose TVS applications.

Tier 3 - Voltage-Rated Alternatives (Design Verification Required):

SMBJ40CA, SMBJ45CA, and SMBJ48CA operate at different voltage ratings (40V, 45V, and 48V respectively) and are suitable only when circuit design permits deviation from the 43V specification. These alternatives maintain the 600W power rating and SMB/DO-214AA package compatibility but require verification that the alternative voltage rating does not compromise circuit protection requirements.

All substitute parts listed maintain Active product status, ROHS3 compliance, and MSL 1 rating, confirming regulatory and environmental compatibility with the original SMBJ43CA-M3/5B specification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ43CA-E3/52 be used as a direct replacement for SMBJ43CA-M3/5B?

A: Yes. Both parts are manufactured by Vishay and maintain identical electrical specifications: 43V reverse standoff, 69.4V clamping voltage, 8.6A peak pulse current, and 600W power dissipation. The designation difference reflects packaging variant coding only. No circuit modification is required.

Q: What is the difference between DO-214AA and SMB package designations?

A: DO-214AA and SMB are equivalent package designations for the same physical form factor used in surface-mount TVS diodes. Both refer to the same mechanical footprint and pin configuration. Parts specified as either designation are mechanically and electrically interchangeable on the PCB.

Q: Can SMBJ43CA-13-F from Diodes Incorporated replace the Vishay SMBJ43CA-M3/5B?

A: Yes. SMBJ43CA-13-F maintains identical electrical specifications across all critical parameters: 43V reverse standoff, 69.4V clamping, 8.6A peak pulse current, and 600W power dissipation. Cross-manufacturer substitution is valid when specifications are identical and both parts carry ROHS3 compliance.

Q: Why are SMBJ40CA, SMBJ45CA, and SMBJ48CA listed as alternatives if they have different voltage ratings?

A: These parts are listed as near-equivalent alternatives within the SMBJ TVS diode family. They are suitable substitutes only when circuit design permits operation at different voltage ratings. SMBJ40CA operates at 40V, SMBJ45CA at 45V, and SMBJ48CA at 48V. Selection among these requires verification that the alternative voltage rating provides adequate protection for the specific application.

Q: What does the operating temperature range difference mean for substitution?

A: The SMBJ43CA-M3/5B operates from -55°C to 150°C. SMBJ43CA-TP extends to -55°C to 175°C, offering wider high-temperature operation. MDD variants operate from -50°C to 150°C. For applications within -55°C to 150°C, all variants are compatible. Applications requiring operation below -50°C or above 150°C require selection of parts with appropriate temperature ratings.

Q: Is inventory level a factor in substitution eligibility?

A: Inventory level does not affect electrical or mechanical substitution eligibility. However, it influences procurement strategy. SMBJ43CA-E3/52 (45,300 pcs) and SMBJ43CA-13-F (90,300 pcs) offer superior availability for volume orders, while SMBJ43CA-M3/5B (998 pcs) has limited stock.

Q: Can I use SMBJ43CA (MDD) with 8.7A peak pulse current instead of 8.6A?

A: Yes. The 8.7A specification represents a 0.1A variance within acceptable tolerance for TVS diode applications. This minor difference does not compromise circuit protection performance and is considered equivalent for general-purpose transient suppression.

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