SMBJ45AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ45AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component is designed for telecom applications requiring transient voltage protection. The part is currently classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

SMBJ45AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 986SMBJ45AHM3_A/I Datasheet

Current PartRFQ

SMBJ45AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 929SMBJ45AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMBJ45AHM3_A/I is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Voltage - Clamping (Max) @ Ipp: 72.7V
• Current - Peak Pulse (10/1000µs): 8.3A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101

The SMBJ45AHM3_B/I is the manufacturer-recommended substitute, maintaining identical electrical specifications and automotive-grade qualification while transitioning from obsolete to active product status.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ45AHM3_B/I is the direct equivalent for the obsolete SMBJ45AHM3_A/I. Both parts maintain identical electrical performance specifications and automotive-grade AEC-Q101 qualification. The primary distinction is product status: the _B/I variant is actively manufactured and supported, while the _A/I is obsolete.

For new designs and ongoing procurement, the SMBJ45AHM3_B/I should be selected. For existing designs currently using the _A/I, direct substitution with the _B/I is electrically and mechanically compatible without circuit modification.

Both parts comply with ROHS3 and maintain the same DO-214AA (SMB) surface mount package, ensuring PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45AHM3_B/I be used as a direct replacement for SMBJ45AHM3_A/I?

A: Yes. The electrical specifications, package type, and automotive qualification are identical. Direct substitution is possible without circuit redesign.

Q: What is the difference between the _A/I and _B/I variants?

A: The primary difference is product status. The _A/I is obsolete, while the _B/I is active. The _B/I also specifies Tape & Reel packaging. Electrical and mechanical parameters are equivalent.

Q: Are there any package or mounting differences?

A: No. Both parts use the DO-214AA (SMB) surface mount package and are compatible with identical PCB layouts and reflow profiles.

Q: Does the substitute part maintain automotive qualification?

A: Yes. The SMBJ45AHM3_B/I retains AEC-Q101 automotive qualification and Automotive grade classification.

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

A: Substitution is determined by matching voltage ratings (45V standoff, 50V breakdown minimum, 72.7V clamping maximum), peak pulse current (8.3A), power dissipation (600W), unidirectional channel configuration, package type (DO-214AA), and operating temperature range (-55°C to 150°C).