SMBG43C-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBG43C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection applications. This component features a 43V reverse standoff voltage with a 76.7V maximum clamping voltage and 7.8A peak pulse current capability in a surface-mount DO-215AA (SMB) package.

The SMBG43C-E3/5B is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

SMBG43C-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 974SMBG43C-E3/5B Datasheet

Current PartRFQ

SMBG43CA-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 773SMBG43CA-E3/5B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBG43C-E3/5B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 43V
• Voltage - Breakdown (Min): 47.8V
• Package / Case: DO-215AA, SMB Gull Wing
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C to 150°C (TJ)

The substitute part SMBG43CA-E3/5B meets all mandatory electrical and mechanical compatibility criteria. Both components share identical reverse standoff voltage, breakdown voltage, package configuration, and operating temperature specifications. Variations in clamping voltage (76.7V vs. 69.4V) and peak pulse current (7.8A vs. 8.6A) remain within the functional tolerance band for general-purpose TVS applications and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

The SMBG43CA-E3/5B is the direct substitute for the obsolete SMBG43C-E3/5B. Selection of the substitute part is supported by the following factors:

• Both components are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) within the same TransZorb® series.
• Electrical specifications for reverse standoff voltage, breakdown voltage, and operating temperature are identical.
• Package and mounting configurations are identical, ensuring mechanical and thermal compatibility with existing PCB designs.
• The SMBG43CA-E3/5B maintains active product status, ensuring ongoing availability and supply chain support.
• Both components meet identical regulatory compliance standards: ROHS3 Compliant, REACH Unaffected, and EAR99 classification.
• Moisture sensitivity level (MSL 1) is equivalent, indicating no additional handling or storage requirements.

The SMBG43CA-E3/5B is available in Tape & Reel (TR) packaging, which is standard for high-volume production environments. The clamping voltage differential (69.4V vs. 76.7V) and peak pulse current increase (8.6A vs. 7.8A) represent performance improvements that do not compromise backward compatibility in general-purpose TVS applications.

Frequently Asked Questions (FAQ)

Q: Can the SMBG43CA-E3/5B be used as a direct replacement for the SMBG43C-E3/5B without PCB modifications?

A: Yes. Both components share identical reverse standoff voltage (43V), breakdown voltage (47.8V), operating temperature range (-55°C to 150°C), and DO-215AA package configuration. No PCB layout or schematic changes are required.

Q: What is the significance of the difference in clamping voltage between the two parts?

A: The SMBG43C-E3/5B specifies a maximum clamping voltage of 76.7V, while the SMBG43CA-E3/5B specifies 69.4V. The lower clamping voltage in the substitute part represents improved transient suppression performance and does not preclude substitution in general-purpose applications.

Q: Are there packaging differences between these two parts?

A: Both components use the DO-215AA (SMB Gull Wing) surface-mount package. The SMBG43C-E3/5B is supplied in standard packaging, while the SMBG43CA-E3/5B is available in Tape & Reel (TR) format, which is preferred for automated assembly processes.

Q: Why is the SMBG43C-E3/5B classified as obsolete?

A: The SMBG43C-E3/5B has been discontinued by the manufacturer. The SMBG43CA-E3/5B is the active replacement part within the same product family and series.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the SMBG43C-E3/5B and SMBG43CA-E3/5B are ROHS3 Compliant, REACH Unaffected, and classified as EAR99. Moisture sensitivity level is MSL 1 (Unlimited) for both components.

Q: Is the increase in peak pulse current (7.8A to 8.6A) a concern for circuit design?

A: No. The higher peak pulse current in the SMBG43CA-E3/5B represents enhanced capability and does not introduce compatibility issues. The component will operate safely within the design specifications of circuits originally designed for the SMBG43C-E3/5B.