SMBJ5931B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The SMBJ5931B-TP is an 18 V, 1.5 W surface mount Zener diode manufactured by Micro Commercial Co in DO-214AA (SMB) package. This component is classified as Active and serves voltage regulation and transient protection applications in electronic circuits. Substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure functional equivalence in circuit design and manufacturing environments.

Substiute Parts

SMBJ5931B-TP

Micro Commercial CoIn Stock: 721SMBJ5931B-TP Datasheet

Current PartRFQ

SMBZ5931B-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 4203SMBZ5931B-E3/52 Datasheet

DirectRFQ

SZ1SMB5931BT3G

onsemiIn Stock: 17618SZ1SMB5931BT3G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ5931B-TP are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Zener (Nominal): 18 V
• Tolerance: ±5%
• Impedance (Maximum): 12 Ohms
• Current - Reverse Leakage @ Vr: 1 µA @ 13.7 V
• Voltage - Forward (Maximum) @ If: 1.5 V @ 200 mA
• Operating Temperature Range: -55°C to 150°C minimum
• Mounting Type: Surface Mount
• Package / Case: DO-214AA or SMB

Allowable Variation:

• Power - Maximum: Substitute parts may exceed the 1.5 W specification of the main part, provided all other electrical parameters remain within tolerance. Higher power ratings provide enhanced thermal capability without affecting circuit function.

Substitute parts meeting these criteria are electrically and mechanically compatible for direct replacement in applications designed for the SMBJ5931B-TP.

Parameter Comparison

Engineering Selection Recommendations

SMBZ5931B-E3/52 (Vishay General Semiconductor - Diodes Division)

This substitute part is qualified for direct replacement. All critical electrical parameters match the SMBJ5931B-TP specification. The power rating is increased to 3 W, providing enhanced thermal margin. The part is ROHS3 compliant and REACH unaffected. Packaging is supplied in Tape & Reel format, suitable for automated assembly environments. Product status is Active with established supply chain availability.

SZ1SMB5931BT3G (onsemi)

This substitute part is qualified for direct replacement. All critical electrical parameters match the SMBJ5931B-TP specification. The power rating is increased to 3 W. The operating temperature range extends to -65°C, providing broader thermal coverage. The part carries Automotive grade qualification and AEC-Q101 certification, indicating suitability for automotive and high-reliability applications. ROHS3 compliance and REACH unaffected status are confirmed. Packaging is supplied in Tape & Reel format. Product status is Active with high inventory availability.

Both substitute parts satisfy the electrical and mechanical requirements for functional equivalence with the SMBJ5931B-TP. Selection between them depends on application requirements, supply chain preferences, and compliance certifications needed for the end application.

Frequently Asked Questions (FAQ)

Q: Can SMBZ5931B-E3/52 or SZ1SMB5931BT3G be used as direct replacements for SMBJ5931B-TP?

A: Yes. Both parts meet all critical electrical parameters: 18 V nominal Zener voltage, ±5% tolerance, 12 Ohms maximum impedance, 1 µA reverse leakage current, 1.5 V maximum forward voltage, and compatible operating temperature ranges. Both are surface mount devices in DO-214AA/SMB package format.

Q: What is the significance of the higher power rating (3 W) in the substitute parts?

A: The substitute parts are rated for 3 W maximum power dissipation compared to 1.5 W for the SMBJ5931B-TP. This higher rating does not affect circuit function. The device operates at the same voltage and current specifications. The increased power rating provides additional thermal capability and margin for transient events without changing the electrical behavior in the circuit.

Q: Are there packaging format differences between the main part and substitutes?

A: Yes. The SMBJ5931B-TP is supplied in Bulk packaging. SMBZ5931B-E3/52 and SZ1SMB5931BT3G are supplied in Tape & Reel (TR) format. Both formats contain the same component in the same DO-214AA/SMB package. Tape & Reel format is standard for automated assembly processes, while Bulk format is used for manual assembly or lower-volume applications.

Q: What compliance certifications apply to each part?

A: All three parts are REACH unaffected. SMBZ5931B-E3/52 and SZ1SMB5931BT3G are ROHS3 compliant. SZ1SMB5931BT3G carries additional Automotive grade qualification and AEC-Q101 certification, making it suitable for automotive and high-reliability applications where these certifications are required.

Q: Does the extended temperature range of SZ1SMB5931BT3G (-65°C to 150°C) affect substitution suitability?

A: No. The extended lower temperature limit of -65°C compared to -55°C for the other parts does not affect substitution. The SZ1SMB5931BT3G operates within the temperature range of the SMBJ5931B-TP and extends capability to lower temperatures. This is a superset of the original specification and does not create incompatibility.

Q: Can these parts be used interchangeably in production?

A: Yes, provided the application requirements and supply chain specifications permit. All three parts are Active status with established availability. The choice between them depends on packaging format requirements (Bulk versus Tape & Reel), compliance certifications needed (automotive or general industrial), and inventory sourcing preferences.