SMBJ43 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ43 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc. in DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 43V and peak pulse power rating of 600W. The SMBJ43 is currently listed as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	45.27	V
Voltage - Clamping (Max) @ Ipp	72.87	V
Current - Peak Pulse (10/1000µs)	8.7	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ43 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 43V (exact match required)
Voltage - Clamping (Max) @ Ipp: Must not exceed 72.87V to ensure equivalent transient suppression performance
Current - Peak Pulse (10/1000µs): Minimum 8.6A to maintain surge handling capability
Power - Peak Pulse: 600W (standard for SMB package class)
Type: Zener diode, unidirectional configuration

Mechanical Compatibility Criteria:

Package / Case: DO-214AA (SMB) surface mount only
Mounting Type: Surface Mount
Moisture Sensitivity Level: MSL 1 (Unlimited)

Compliance Requirements:

RoHS3 Compliant (mandatory for new designs)

All substitute parts listed below meet these criteria. Variations in clamping voltage (69.4V vs. 72.87V) and peak pulse current (8.6A vs. 8.7A) remain within acceptable engineering tolerances for the 43V suppression class and do not affect functional interchangeability in general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SMBJ43	Littelfuse Inc.	43	45.27	72.87	8.7	600	-65 to 150	DO-214AA (SMB)	Obsolete
SMBJ43A	Meritek	43	47.8	69.4	8.65	600	-55 to 150	DO-214AA (SMB)	Active
SZ1SMB43AT3G	Littelfuse Inc.	43	47.8	69.4	8.6	600	-65 to 150	DO-214AA (SMB)	Active
SMBJ43A-13-F	Diodes Incorporated	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ43A-E3/52	Vishay General Semiconductor - Diodes Division	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ43A-M3/52	Vishay General Semiconductor - Diodes Division	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ43A-M3/5B	Vishay General Semiconductor - Diodes Division	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ43A-TP	Micro Commercial Co	43	47.8	69.4	8.6	600	-55 to 175	DO-214AA (SMB)	Active
TV06B430J-G	Comchip Technology	43	47.8	69.4	8.65	600	Not specified	DO-214AA (SMB)	Active

Engineering Selection Recommendations

All listed substitute parts are RoHS3 compliant and MSL 1 rated, meeting current regulatory and manufacturing requirements. Selection among active alternatives should prioritize:

Primary Selection Criteria:

Product Status: All substitutes listed are Active, ensuring long-term availability and supply chain stability
Manufacturer Support: Littelfuse Inc. (SZ1SMB43AT3G) and Vishay General Semiconductor (SMBJ43A-E3/52, SMBJ43A-M3/52, SMBJ43A-M3/5B) are established suppliers with established qualification and support infrastructure
Inventory Availability: Diodes Incorporated (SMBJ43A-13-F) offers the highest inventory level (215,300 pcs), providing supply security for high-volume production

Temperature Range Considerations:

SZ1SMB43AT3G maintains the original -65°C to 150°C operating range of the SMBJ43
SMBJ43A-TP extends the upper temperature limit to 175°C, suitable for elevated ambient applications
Meritek SMBJ43A and all Diodes/Vishay variants operate within -55°C to 150°C, acceptable for most general-purpose applications

Automotive and Qualification Requirements:

SZ1SMB43AT3G carries AEC-Q101 automotive qualification, required for automotive transient suppression circuits

Frequently Asked Questions (FAQ)

Q: Can SMBJ43A variants from different manufacturers be used interchangeably?

A: Yes. All SMBJ43A variants (Meritek, Diodes Incorporated, Vishay) meet the same electrical specifications for 43V reverse standoff voltage, 69.4V maximum clamping voltage, and 8.6A peak pulse current. They are mechanically identical in DO-214AA (SMB) package and are functionally interchangeable for general-purpose transient suppression.

Q: What is the difference between SMBJ43A and SZ1SMB43AT3G?

A: Both parts share identical electrical parameters (43V standoff, 69.4V clamping, 8.6A peak pulse). The primary differences are: SZ1SMB43AT3G is manufactured by Littelfuse Inc. (original SMBJ43 manufacturer), maintains the full -65°C to 150°C temperature range, and carries AEC-Q101 automotive qualification. SMBJ43A variants operate at -55°C minimum and lack automotive qualification. Selection depends on temperature requirements and automotive compliance needs.

Q: Is the clamping voltage difference (72.87V original vs. 69.4V substitutes) significant?

A: No. The 3.47V reduction in maximum clamping voltage represents a 4.8% variance within acceptable engineering tolerance for the 43V suppression class. This variation does not affect functional performance in general-purpose transient suppression applications and remains within the design margin of protected circuits.

Q: Can I use SMBJ43A-TP with an upper operating temperature of 175°C instead of 150°C?

A: Yes, if your application requires operation above 150°C. SMBJ43A-TP from Micro Commercial Co is rated to 175°C junction temperature and maintains all other electrical specifications identical to standard SMBJ43A variants. Verify that your circuit design and PCB thermal management support sustained operation at elevated temperatures.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and MSL 1 rated, meeting current environmental and manufacturing standards for new designs and production.

Q: What packaging options are available?

A: All substitute parts are supplied in DO-214AA (SMB) surface mount package. Most are available in Tape & Reel (TR) packaging for automated assembly. Verify specific packaging availability with your supplier for production requirements.

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