P4SMA440AHM3_A/I Equivalent & Substitute Parts

Part Overview

The P4SMA440AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient voltage protection. This component features a 376V reverse standoff voltage with 602V maximum clamping voltage and 500mA 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 P4SMA440AHM3_A/I is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain flexibility for new production runs and field replacements.

Substiute Parts

P4SMA440AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 978P4SMA440AHM3_A/I Datasheet

Current PartRFQ

P4SMA440AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 704P4SMA440AHM3_B/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA440AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 376V
• Voltage - Breakdown (Min): 418V
• Voltage - Clamping (Max) @ Ipp: 602V
• Current - Peak Pulse (10/1000µs): 500mA
• Power - Peak Pulse: 400W
• Operating Temperature Range: -65°C ~ 150°C (TJ)
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional (1 channel)
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The P4SMA440AHM3_B/I meets all substitution criteria as a direct equivalent from the same manufacturer, series, and base product number (P4SMA440). The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA440AHM3_B/I is a direct functional equivalent to the P4SMA440AHM3_A/I. Both parts share identical electrical specifications, thermal performance, and compliance certifications (AEC-Q101, ROHS3). The P4SMA440AHM3_B/I maintains active product status with current manufacturing availability, making it the appropriate selection for new designs and production continuity.

The distinction between the two parts is packaging format: the A/I variant is supplied in bulk packaging, while the B/I variant is supplied in Tape & Reel (TR) format. This difference does not affect electrical performance or functional compatibility. Selection between these variants should be based on procurement requirements and assembly process specifications.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA440AHM3_B/I be used as a direct replacement for the P4SMA440AHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical, with matching voltage ratings (376V standoff, 602V clamping), current ratings (500mA peak pulse), thermal performance (-65°C to 150°C), and package specifications (DO-214AC, SMA). The only difference is packaging format (bulk versus Tape & Reel).

Q: What determines substitution eligibility for P4SMA440 series TVS diodes?

A: Substitution requires exact equivalence across voltage parameters (reverse standoff, breakdown, and clamping voltages), current ratings (peak pulse current), thermal operating range, package type (DO-214AC, SMA), mounting method (surface mount), and compliance certifications (AEC-Q101, ROHS3). All these parameters must match the original specification.

Q: Does the Tape & Reel packaging of the P4SMA440AHM3_B/I affect circuit performance?

A: No. Tape & Reel packaging is a supply format used for automated assembly processes. It does not alter the electrical characteristics, thermal performance, or reliability of the component itself.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the P4SMA440AHM3_A/I and P4SMA440AHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the significance of the ROHS3 compliance status?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. Both parts are ROHS3 compliant, ensuring regulatory compliance for applications in regulated markets.