Vishay General Semiconductor - Diodes Division P6SMB15AHM3_B/I

Overview

P6SMB15AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 15 V breakdown voltage (V_BR = 14.3–15.8 V at 1 mA), 12.8 V stand-off voltage (V_WM), 21.2 V maximum clamping voltage at 28.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.

For engineers reviewing the P6SMB15AHM3_B/I datasheet, P6SMB15AHM3_B/I pinout, P6SMB15AHM3_B/I application, or P6SMB15AHM3_B/I equivalent, this AEC-Q101 qualified, halogen-free, RoHS-compliant TVS diode delivers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and surge protection design.

Technical Context

The P6SMB15AHM3_B/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable V_BR tolerance (±5%) and fast response time (<1 ns), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).

Thermally, it exhibits R_θJA = 100 °C/W and R_θJL = 20 °C/W, supporting operation up to T_J = 150 °C. The cathode-band-marked SMB package allows automated placement and meets UL 94 V-0 flammability rating with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, cathode-band marked, dimensions 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), UL 94 V-0 molded compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ15A-E3/5B and 1.5SMC15A, the P6SMB15AHM3_B/I uniquely combines AEC-Q101 qualification, 600 W surge capability, and compact SMB footprint - making it optimal for space-constrained automotive modules requiring certified reliability and high-energy clamping.

Availability

P6SMB15AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for P6SMB15AHM3_B/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The P6SMB Series targets board-level transient protection in automotive, industrial, and communications systems - engineered for high surge immunity, low clamping voltage, and seamless integration into automated SMT lines.

FAQ

What is the maximum clamping voltage of the P6SMB15AHM3_B/I under surge conditions?

The P6SMB15AHM3_B/I has a maximum clamping voltage (V_C) of 21.2 V at 28.3 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions and represents the highest voltage imposed on the protected circuit during a transient event - critical for ensuring downstream ICs remain within absolute maximum ratings. The P6SMB15AHM3_B/I maintains this clamping performance across its full operating temperature range (-65 °C to +150 °C).

Is the P6SMB15AHM3_B/I suitable for automotive applications?

Yes, the P6SMB15AHM3_B/I is AEC-Q101 qualified, as indicated by the "HM3" and "_B" suffixes in its part number. It has undergone rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD qualification per automotive standards. The P6SMB15AHM3_B/I is specifically intended for under-hood and body electronics where reliability under thermal and electrical stress is mandatory - such as engine control units, lighting modules, and ADAS sensor interfaces.

What does the "HM3_B/I" suffix mean in P6SMB15AHM3_B/I?

The "HM3" denotes halogen-free, RoHS-compliant construction with whisker-resistant matte tin plating; "_B" indicates AEC-Q101 qualification for the 6.8 V to 220 V voltage range; and "/I" specifies packaging in 13-inch tape-and-reel format with 3200 units per reel. This full suffix confirms the P6SMB15AHM3_B/I meets automotive environmental and reliability requirements while enabling high-volume SMT assembly - distinguishing it from commercial-grade variants like P6SMB15A-E3/52.

How does the P6SMB15AHM3_B/I compare to bidirectional TVS diodes?

The P6SMB15AHM3_B/I is unidirectional and functions only in reverse-bias avalanche mode - ideal for DC power rail protection where polarity is fixed. Unlike bidirectional types (e.g., P6SMB15CA), it cannot suppress AC or bipolar transients without external circuitry. Its advantage lies in lower leakage (<1 µA at 12.8 V) and tighter V_BR tolerance, making the P6SMB15AHM3_B/I preferable for 12 V/24 V automotive supply rails and single-polarity signal lines where directional clamping suffices.

What is the thermal resistance of the P6SMB15AHM3_B/I, and how does it affect layout?

The P6SMB15AHM3_B/I has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W and junction-to-lead (R_θJL) of 20 °C/W when mounted on 0.2" × 0.2" copper pads. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area and thermal vias - especially since the P6SMB15AHM3_B/I operates up to 150 °C. Reducing R_θJA via enhanced copper pour directly extends surge endurance and lifetime reliability.