1SMB43CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB43CAT3 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 8.6A peak pulse current capability in a DO-214AA (SMB) package. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support.

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
Bidirectional Channels	1	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C to 150°C	TJ
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 1SMB43CAT3 is determined by strict equivalence across the following electrical and mechanical parameters:

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

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all electrical specifications with identical clamping voltage (69.4V) and peak pulse current (8.6A ±0.1A).

Similar Alternatives: Parts with the same reverse standoff voltage (43V) and package but differing clamping voltage or peak pulse current specifications. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc (Max) @ Ipp (V)	Ipp (A)	Package	Product Status	RoHS Status	Temp Range (°C)
1SMB43CAT3	onsemi	43	69.4	8.6	DO-214AA, SMB	Obsolete	Non-compliant	-65 to 150
SMBJ43CA	MDD	43	69.4	8.7	DO-214AA, SMB	Active	ROHS3 Compliant	-50 to 150
SMBJ43CA-13-F	Diodes Incorporated	43	69.4	8.6	DO-214AA, SMB	Active	ROHS3 Compliant	-55 to 150
SMBJ43CA-TP	Micro Commercial Co	43	69.4	8.6	DO-214AA, SMB	Active	ROHS3 Compliant	-55 to 175
SMBJ43CAE3/TR13	Microchip Technology	43	69.4	8.6	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 150
TV06B430JB-G	Comchip Technology	43	69.4	8.65	DO-214AA, SMB	Active	ROHS3 Compliant	Not specified
SMBJ40CA	MDD	40	64.5	9.3	DO-214AA, SMB	Active	ROHS3 Compliant	-50 to 150
SMBJ43CE3/TR13	Microchip Technology	43	76.7	7.8	DO-214AA, SMB	Active	ROHS3 Compliant	-65 to 150

Engineering Selection Recommendations

Direct Substitutes (Electrical Equivalence):

SMBJ43CA-13-F (Diodes Incorporated), SMBJ43CA-TP (Micro Commercial Co), SMBJ43CAE3/TR13 (Microchip Technology), and TV06B430JB-G (Comchip Technology) provide direct electrical equivalence to the 1SMB43CAT3 with identical or near-identical clamping voltage (69.4V) and peak pulse current (8.6A ±0.1A). All are active products with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance status of the original part.

SMBJ43CA (MDD) offers electrical equivalence with 8.7A peak pulse current, within acceptable tolerance. This part is active and ROHS3 compliant.

Similar Alternatives (Voltage Class Equivalent):

SMBJ40CA (MDD) maintains the same package and mounting type but operates at a lower reverse standoff voltage (40V) with reduced clamping voltage (64.5V) and increased peak pulse current (9.3A). This part is suitable only for applications where the lower voltage rating is acceptable.

SMBJ43CE3/TR13 (Microchip Technology) maintains the 43V reverse standoff voltage but features elevated clamping voltage (76.7V) and reduced peak pulse current (7.8A). This part is suitable only for applications tolerant of higher clamping voltage.

Compliance Considerations:

All recommended direct substitutes are ROHS3 compliant, addressing regulatory requirements not met by the obsolete 1SMB43CAT3. Selection should prioritize parts with active product status and established supply availability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ43CA replace 1SMB43CAT3 directly?

A: Yes. SMBJ43CA (MDD) provides direct electrical equivalence with 43V reverse standoff voltage, 69.4V clamping voltage, and 8.7A peak pulse current. The 0.1A difference in peak pulse current is within acceptable tolerance for general-purpose TVS applications. The part is active and ROHS3 compliant.

Q: What is the difference between SMBJ43CA-13-F and SMBJ43CAE3/TR13?

A: Both parts are electrically equivalent with identical 43V reverse standoff, 69.4V clamping voltage, and 8.6A peak pulse current. SMBJ43CA-13-F is manufactured by Diodes Incorporated with operating temperature range -55°C to 150°C. SMBJ43CAE3/TR13 is manufactured by Microchip Technology with operating temperature range -65°C to 150°C. Selection depends on temperature requirements and supplier availability.

Q: Can SMBJ40CA be used as a substitute?

A: SMBJ40CA is not a direct substitute. It operates at 40V reverse standoff voltage with 64.5V clamping voltage, compared to the 43V and 69.4V specifications of 1SMB43CAT3. Use only if circuit design tolerates lower voltage protection levels.

Q: Why is SMBJ43CE3/TR13 listed as a similar alternative?

A: SMBJ43CE3/TR13 maintains the 43V reverse standoff voltage and DO-214AA package but features 76.7V clamping voltage and 7.8A peak pulse current. This part is suitable only for applications where higher clamping voltage is acceptable and lower peak pulse current is sufficient.

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

A: Yes. All listed substitute parts use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and thermal compatibility with the original 1SMB43CAT3 footprint.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: The original 1SMB43CAT3 is RoHS non-compliant. All recommended direct substitutes are ROHS3 compliant, meeting current regulatory requirements for electronic components in most markets. This is a critical consideration for new designs and production transitions.

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