SMBJ43C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMBJ43C is a 600W bidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates at a 43V reverse standoff voltage with a 76.7V maximum clamping voltage and 8.2A peak pulse current rating. The device is packaged in DO-214AA (SMB) format and is classified as Active product status.

TVS diodes protect sensitive electronic circuits from transient voltage spikes caused by electrostatic discharge (ESD), inductive switching, and other surge events. Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	76.7	V
Current - Peak Pulse (10/1000µs)	8.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-55 to 150	°C (TJ)
Bidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ43C is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Reverse Standoff (Typ): 43V (exact match required)
Voltage - Breakdown (Min): 47.8V minimum (exact match or higher acceptable)
Power - Peak Pulse: 600W (exact match required)
Bidirectional Channels: 1 (exact match required)
Current - Peak Pulse (10/1000µs): 8.2A minimum (equal or higher acceptable)

Mechanical Compatibility Requirements:

Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)

Compliance Requirements:

RoHS Status: ROHS3 Compliant (exact match required)
ECCN: EAR99 (exact match required)
HTSUS: 8541.10.0080 (exact match required)

All substitute parts listed below meet these criteria. Variations in clamping voltage (within the specified range) and peak pulse current (at or above the minimum) are permissible as they do not compromise circuit protection performance.

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 Range (°C)	Package
SMBJ43C	Taiwan Semiconductor Corporation	43	47.8	76.7	8.2	600	-55 to 150	DO-214AA (SMB)
SMBJ43CA	MDD	43	47.8	69.4	8.7	600	-50 to 150	DO-214AA (SMB)
SMBJ43CA-E3/52	Vishay General Semiconductor - Diodes Division	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMBJ)
SMBJ43CA-E3/5B	Vishay General Semiconductor - Diodes Division	43	47.8	69.4	8.6	600	-55 to 150	DO-214AA (SMBJ)
SMBJ43CA-Q	Bourns Inc.	43	47.8	69.4	8.7	600	-55 to 150	DO-214AA (SMB)
SMBJ43CA-TP	Micro Commercial Co	43	47.8	69.4	8.6	600	-55 to 175	DO-214AA (SMB)
SMBJ43CD-M3/H	Vishay General Semiconductor - Diodes Division	43	48.5	68.5	8.76	600	-55 to 150	DO-214AA (SMBJ)

Engineering Selection Recommendations

All substitute parts listed are Active product status and ROHS3 compliant, meeting current regulatory requirements for electronic component procurement.

Manufacturer-Specific Considerations:

Vishay General Semiconductor - Diodes Division (SMBJ43CA-E3/52, SMBJ43CA-E3/5B, SMBJ43CD-M3/H) offers TransZorb® series TVS diodes with established qualification in industrial and commercial applications. These parts maintain the -55°C to 150°C operating temperature range consistent with the primary part.

Bourns Inc. (SMBJ43CA-Q) provides AEC-Q101 automotive qualification and is designated for telecom applications. This part carries automotive-grade certification, suitable for applications requiring enhanced reliability standards.

Micro Commercial Co (SMBJ43CA-TP) extends the operating temperature range to -55°C to 175°C, providing additional thermal margin for high-temperature environments.

MDD (SMBJ43CA) offers general-purpose TVS protection with a reduced lower operating temperature limit of -50°C, acceptable for applications not requiring full -55°C performance.

Clamping Voltage Variation:

The primary part (SMBJ43C) specifies a maximum clamping voltage of 76.7V. Substitute parts exhibit clamping voltages between 68.5V and 69.4V. Lower clamping voltages provide enhanced circuit protection by limiting transient peaks to lower levels, which is advantageous in sensitive applications. This variation does not compromise substitutability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ43CA substitute for SMBJ43C in all applications?

A: Yes, SMBJ43CA meets all critical electrical and mechanical parameters. The 43V reverse standoff voltage, 600W power rating, and DO-214AA package are identical. The lower clamping voltage (69.4V vs. 76.7V) provides superior transient suppression. Operating temperature range differs slightly (-50°C vs. -55°C minimum), which is acceptable for most commercial applications.

Q: What is the difference between SMBJ43CA-E3/52 and SMBJ43CA-E3/5B?

A: Both parts are manufactured by Vishay and share identical electrical specifications (43V standoff, 69.4V clamping, 8.6A peak pulse). The designations E3/52 and E3/5B represent different tape and reel packaging configurations or manufacturing date codes. Electrical performance and compatibility are equivalent.

Q: Is SMBJ43CA-Q suitable for automotive applications?

A: SMBJ43CA-Q carries AEC-Q101 automotive qualification and is designated for telecom applications. It meets automotive-grade reliability standards and is suitable for automotive circuit protection where enhanced qualification is required.

Q: Why does SMBJ43CA-TP have a higher maximum operating temperature?

A: SMBJ43CA-TP extends the operating temperature range to 175°C (vs. 150°C for other parts). This provides additional thermal margin for applications in high-temperature environments. All other electrical parameters remain compatible with SMBJ43C.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes, all listed substitute parts are supplied in Tape & Reel (TR) packaging, consistent with the primary part's packaging format for automated assembly processes.

Q: What is the significance of the SMBJ43CD-M3/H variant?

A: SMBJ43CD-M3/H is a TransZorb® variant with a slightly higher minimum breakdown voltage (48.5V vs. 47.8V) and lower clamping voltage (68.5V). The peak pulse current is marginally higher at 8.76A. These variations remain within acceptable substitution parameters.

Q: Do all substitute parts comply with RoHS3 and REACH regulations?

A: All substitute parts are ROHS3 compliant. REACH status varies: most parts are REACH Unaffected; SMBJ43CA-Q is REACH Affected. Verify REACH compliance requirements for your specific application and jurisdiction.

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