P4SMA400AHM3_A/I Equivalent & Substitute Parts

Part Overview

The P4SMA400AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring high-voltage transient protection. This component features a 548V maximum clamping voltage and 550mA peak pulse current capability in a surface-mount DO-214AC (SMA) package. The part is AEC-Q101 qualified for automotive-grade reliability and ROHS3 compliant.

The P4SMA400AHM3_A/I is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring identical electrical and mechanical specifications.

Substiute Parts

P4SMA400AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1129P4SMA400AHM3_A/I Datasheet

Current PartRFQ

P4SMA400AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 789P4SMA400AHM3_B/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA400AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage ratings: Reverse standoff voltage (342V typical), breakdown voltage (380V minimum), and clamping voltage (548V maximum) must be identical
• Current handling: Peak pulse current of 550mA and peak pulse power of 400W must match exactly
• Package compatibility: DO-214AC (SMA) surface-mount package is mandatory for PCB layout compatibility
• Electrical type: Unidirectional Zener TVS diode with single channel configuration
• Thermal and compliance specifications: Operating temperature range (-65°C to 150°C), automotive grade, AEC-Q101 qualification, and ROHS3 compliance must be maintained

The substitute part P4SMA400AHM3_B/I meets all these criteria and represents a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA400AHM3_B/I is the direct substitute for the discontinued P4SMA400AHM3_A/I. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications, thermal performance, and compliance certifications.

The primary distinction is product status: P4SMA400AHM3_A/I is discontinued, while P4SMA400AHM3_B/I maintains active production status. The substitute part is supplied in Tape & Reel (TR) packaging, which is standard for high-volume manufacturing and automated assembly processes.

Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality requirements are met for telecom and automotive applications. The identical electrical parameters guarantee functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can P4SMA400AHM3_B/I be used as a direct replacement for P4SMA400AHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical. They share the same voltage ratings (342V standoff, 548V clamping), current handling (550mA peak pulse), package type (DO-214AC SMA), and compliance certifications (AEC-Q101, ROHS3). The only difference is product status and packaging format.

Q: What is the difference between the packaging specifications?

A: P4SMA400AHM3_A/I packaging is not specified in available data. P4SMA400AHM3_B/I is supplied in Tape & Reel (TR) format, which is the standard packaging for surface-mount components in automated manufacturing. Both use the same DO-214AC (SMA) component package.

Q: Are there any thermal or operating condition differences?

A: No. Both parts operate across the identical temperature range of -65°C to 150°C (junction temperature) and maintain the same power dissipation characteristics (400W peak pulse power).

Q: Do both parts meet automotive and compliance requirements?

A: Yes. Both P4SMA400AHM3_A/I and P4SMA400AHM3_B/I are automotive-grade components with AEC-Q101 qualification. Both are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for automotive and telecom applications.

Q: Why is the original part discontinued?

A: Product discontinuation decisions are made by manufacturers based on market demand and production planning. The availability of the active substitute P4SMA400AHM3_B/I ensures design continuity without requiring circuit modifications.