P4SMA91AHM3/H Equivalent & Substitute Parts

Part Overview

The P4SMA91AHM3/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for telecom applications requiring transient voltage protection with a 77.8V reverse standoff voltage and 125V maximum clamping voltage. The part is classified as discontinued at DiGi Electronics, making identification of equivalent substitutes essential for ongoing design support and procurement.

Substiute Parts

P4SMA91AHM3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 785P4SMA91AHM3/H Datasheet

Current PartRFQ

P4SMA91AHM3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1083P4SMA91AHM3_A/H Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA91AHM3/H is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• Voltage - Breakdown (Min): 86.5V
• Voltage - Clamping (Max) @ Ipp: 125V
• Current - Peak Pulse (10/1000µs): 3.2A
• Power - Peak Pulse: 400W
• Unidirectional Channels: 1
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Operating Temperature Range: -65°C ~ 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101

The substitute part P4SMA91AHM3_A/H maintains identical electrical specifications and mechanical compatibility. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA91AHM3_A/H is a direct functional equivalent to the P4SMA91AHM3/H. Both parts are manufactured by Vishay and maintain identical electrical and mechanical specifications. The primary advantage of the P4SMA91AHM3_A/H is its active product status and availability in Tape & Reel packaging format, which supports automated assembly processes and higher-volume procurement.

For applications requiring the P4SMA91AHM3/H, the P4SMA91AHM3_A/H provides equivalent performance with improved supply chain continuity. Both parts satisfy automotive-grade requirements with AEC-Q101 qualification and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can P4SMA91AHM3_A/H replace P4SMA91AHM3/H in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters including voltage ratings, current capacity, temperature range, and package specifications. The substitute part maintains the same DO-214AC (SMA) surface mount package and automotive qualification.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and packaging format. The P4SMA91AHM3/H is discontinued, while the P4SMA91AHM3_A/H is active. The substitute part is supplied in Tape & Reel format, which is standard for high-volume manufacturing and automated assembly.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical certifications: AEC-Q101 automotive qualification, ROHS3 compliance, and MSL 1 (Unlimited) moisture sensitivity rating.

Q: What packaging considerations apply to the substitute part?

A: The P4SMA91AHM3_A/H is supplied in Tape & Reel (TR) format, which is compatible with standard pick-and-place assembly equipment. This format is preferred for production environments and supports higher-volume procurement compared to standard packaging.

Q: Are the electrical performance characteristics identical?

A: Yes. Both parts maintain identical specifications: 77.8V reverse standoff voltage, 86.5V minimum breakdown voltage, 125V maximum clamping voltage, 3.2A peak pulse current, and 400W peak pulse power rating.