SMBJ30AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ30AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in telecom applications, featuring a 30V reverse standoff voltage and 48.4V maximum clamping voltage in a surface-mount DO-214AA (SMB) package. The part is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and component procurement.

Substiute Parts

SMBJ30AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1109SMBJ30AHM3_A/I Datasheet

Current PartRFQ

SMBJ30AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 925SMBJ30AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ30AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage rating: 30V reverse standoff, 33.3V minimum breakdown, 48.4V maximum clamping
• Current handling: 12.4A peak pulse current (10/1000µs)
• Power dissipation: 600W peak pulse
• Package type: DO-214AA (SMB) surface mount
• Unidirectional configuration: Single channel Zener TVS diode
• Temperature range: -55°C to 150°C junction temperature
• Automotive grade with AEC-Q101 qualification
• RoHS3 compliance

Only components matching all these parameters across electrical performance and mechanical form factor are considered direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ30AHM3_B/I is the direct substitute for the obsolete SMBJ30AHM3_A/I. Both components are manufactured by Vishay within the TransZorb® series and maintain identical electrical specifications across all critical parameters: 30V standoff voltage, 33.3V minimum breakdown, 48.4V clamping voltage, 12.4A peak pulse current, and 600W peak power dissipation.

The primary distinction is product status: SMBJ30AHM3_A/I is obsolete, while SMBJ30AHM3_B/I is active and currently in production. Both parts carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance, ensuring continued availability and regulatory alignment for new designs and production runs.

The packaging difference—bulk versus Tape & Reel—reflects standard distribution formats and does not affect electrical or mechanical compatibility. Selection between these formats depends on procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ30AHM3_B/I be used as a direct replacement for SMBJ30AHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The primary difference is product status: the A/I variant is obsolete, while the B/I variant is active. No circuit modifications or re-qualification are required.

Q: What is the significance of the packaging difference (bulk vs. Tape & Reel)?

A: Packaging type affects procurement and assembly logistics only. Tape & Reel (TR) packaging is standard for automated assembly lines, while bulk packaging may be used for manual assembly or lower-volume applications. Electrical and mechanical performance are identical.

Q: Are both parts qualified for automotive applications?

A: Yes. Both SMBJ30AHM3_A/I and SMBJ30AHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution is determined by matching voltage ratings (30V standoff, 33.3V breakdown, 48.4V clamping), current handling (12.4A peak pulse), power dissipation (600W), package type (DO-214AA SMB), unidirectional configuration, temperature range (-55°C to 150°C), and automotive qualification (AEC-Q101).

Q: Is the SMBJ30AHM3_B/I available in inventory?

A: Availability is subject to current stock levels. The B/I variant is an active product with ongoing production, providing better long-term availability compared to the obsolete A/I variant.