Vishay General Semiconductor - Diodes Division P6SMB15AHM3_A/I

Overview

P6SMB15AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, rated for 15 V standoff voltage (VWM = 12.8 V), 21.2 V clamping voltage at 28.3 A peak pulse current (10/1000 μs), and 600 W peak pulse power - deployed for overvoltage protection of MOSFET gates, sensor signal lines, and DC power rails in automotive and industrial control modules.

For engineers reviewing the P6SMB15AHM3_A/I datasheet, P6SMB15AHM3_A/I pinout, P6SMB15AHM3_A/I application, or P6SMB15AHM3_A/I equivalent, key selection criteria include verified clamping performance under 10/1000 μs transients, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (R_θJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.

Technical Context

This device operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its breakdown threshold (V_BR = 14.3–15.8 V at 1 mA), then clamping transient energy to ≤21.2 V while conducting up to 28.3 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at V_WM) and fast response time (<1.0 ns).

Designed for repetitive surge duty cycles ≤0.01 %, it sustains 600 W peak pulse power per 10/1000 μs waveform and handles 100 A non-repetitive forward surge (8.3 ms half-sine). Junction temperature remains within -65 °C to +150 °C, with MSL Level 1 rating and 260 °C reflow peak tolerance.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMAJ15A-E3/5B, P6SMB15AHM3_A/I delivers 50 % higher surge power handling and automotive qualification; versus 1.5SMC15A, it offers identical clamping performance in a 30 % smaller SMB footprint - ideal for space-constrained automotive ECUs where 600 W is sufficient.

Availability

P6SMB15AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and DC-DC converter input protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.

Supply support for P6SMB15AHM3_A/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, automotive qualification, and high-volume manufacturability.

The P6SMB Series targets surface-mount transient suppression in automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 compliance are mandatory design requirements.

FAQ

What is the clamping voltage of P6SMB15AHM3_A/I at its rated peak pulse current?

The P6SMB15AHM3_A/I has a maximum clamping voltage (V_C) of 21.2 V when subjected to its rated peak pulse current of 28.3 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case conduction behavior during transient events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The P6SMB15AHM3_A/I achieves this with low incremental resistance, minimizing voltage overshoot beyond the clamping threshold.

Is P6SMB15AHM3_A/I qualified for automotive applications?

Yes, P6SMB15AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's P6SMB series datasheet (Document Number 88370, Revision 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for under-hood and chassis-mounted automotive electronics. The P6SMB15AHM3_A/I meets the full AEC-Q101-011 standard for transient voltage suppressors.

What does the "HM3" suffix indicate in P6SMB15AHM3_A/I?

The "HM3" suffix in P6SMB15AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" indicates halogen-free molding compound, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "_A/I" denotes tape-and-reel packaging in 13-inch reels (I) with revision A. This distinguishes it from commercial-grade variants like E3 or M3 without automotive qualification.

How does P6SMB15AHM3_A/I compare to bidirectional TVS diodes in the same series?

P6SMB15AHM3_A/I is unidirectional, meaning it conducts only in reverse bias above V_BR, with polarity marked by a cathode band. Bidirectional variants (e.g., P6SMB15CA) have symmetric clamping in both directions and no polarity marking. The P6SMB15AHM3_A/I is selected when protection is needed only on one side of a DC rail - offering tighter V_BR tolerance and slightly lower leakage than bidirectional equivalents at the same V_WM.

What PCB layout guidance applies to P6SMB15AHM3_A/I for optimal thermal and electrical performance?

For optimal performance, P6SMB15AHM3_A/I should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This pad area ensures the rated R_θJA of 100 °C/W is achieved and supports reliable 600 W pulse dissipation. Traces to the device must be short and wide to minimize inductance, and the cathode should connect directly to the protected node with minimal loop area to preserve sub-nanosecond response.