SMBJ188AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ188AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications. This surface mount component in DO-214AA (SMB) package provides transient overvoltage protection with a 188V reverse standoff voltage and 328V maximum clamping voltage. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

SMBJ188AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 890SMBJ188AHM3_A/I Datasheet

Current PartRFQ

SMBJ188AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 679SMBJ188AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ188AHM3_A/I is determined by strict equivalence across the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 188V
• Voltage - Breakdown (Min): 209V
• Voltage - Clamping (Max) @ Ipp: 328V
• Current - Peak Pulse (10/1000µs): 2A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Type: Zener
• Series: TransZorb®

The SMBJ188AHM3_B/I is identified as the manufacturer-recommended substitute. This part maintains identical electrical specifications and mechanical compatibility while offering active product status, ensuring long-term availability and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ188AHM3_B/I is the direct equivalent for the obsolete SMBJ188AHM3_A/I. Both parts are manufactured by Vishay General Semiconductor - Diodes Division within the TransZorb® series and share identical electrical and mechanical specifications. The substitute part maintains full automotive-grade qualification (AEC-Q101) and ROHS3 compliance, ensuring regulatory and quality standards are preserved.

The primary distinction is product status: the SMBJ188AHM3_B/I is active and available, while the original part is obsolete. The substitute is supplied in Tape & Reel (TR) packaging, which is standard for production environments. Selection of the SMBJ188AHM3_B/I eliminates obsolescence risk and ensures continued component availability for new production and field service applications.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ188AHM3_B/I be used as a direct replacement for the SMBJ188AHM3_A/I?

A: Yes. Both parts are identical in electrical performance and mechanical form factor. The SMBJ188AHM3_B/I is the manufacturer-recommended substitute and provides the same 188V reverse standoff voltage, 328V clamping voltage, 2A peak pulse current, and 600W peak pulse power rating. No circuit modifications are required.

Q: What is the difference between the SMBJ188AHM3_A/I and SMBJ188AHM3_B/I?

A: The primary difference is product status and packaging format. The SMBJ188AHM3_A/I is obsolete, while the SMBJ188AHM3_B/I is active. The substitute is supplied in Tape & Reel (TR) packaging. All electrical specifications and performance characteristics are identical.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SMBJ188AHM3_A/I and SMBJ188AHM3_B/I carry automotive-grade designation and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: Is the DO-214AA (SMB) package identical between both parts?

A: Yes. Both parts use the same DO-214AA surface mount package, ensuring mechanical and thermal compatibility on PCBs designed for either component.

Q: What compliance certifications apply to the SMBJ188AHM3_B/I?

A: The substitute part is ROHS3 compliant and REACH unaffected, maintaining the same regulatory compliance as the original part.