Vishay General Semiconductor - Diodes Division SM6T36AHM3_B/H

Overview

SM6T36AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, with 34.2 V minimum breakdown voltage (V_BR), 30.8 V standoff voltage (V_WM), 49.9 V maximum clamping voltage at 12.0 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive ECUs against inductive switching transients.

For engineers reviewing the SM6T36AHM3_B/H datasheet, SM6T36AHM3_B/H pinout, SM6T36AHM3_B/H application, or SM6T36AHM3_B/H equivalent, key selection criteria include clamping performance under 12 A transient surge, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (R_θJA = 100 °C/W), and unidirectional polarity marking via cathode band.

Technical Context

This TVS diode operates as a shunt-clamping device that remains high-impedance below V_WM = 30.8 V and rapidly transitions to low-impedance conduction above V_BR = 34.2–37.8 V. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at V_WM).

Designed for PCB-level transient suppression, it delivers 600 W peak pulse power handling with minimal inductance and meets MSL Level 1 moisture sensitivity (peak reflow ≤260 °C). The SMB package supports automated placement and provides thermal dissipation of 5.0 W on infinite heatsink at 50 °C ambient.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by molded band on case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ36A-E3/5B and SMCJ36A-HM3, the SM6T36AHM3_B/H offers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and SMB footprint-making it ideal for space-constrained automotive modules requiring validated reliability without over-engineering.

Availability

SM6T36AHM3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, ADAS camera power rails, and consumer appliance motor drivers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SM6T36AHM3_B/H 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.

The SM6T Series was developed specifically for robust, surface-mount transient protection in automotive and industrial environments where AEC-Q101 qualification, low clamping voltage, and automated assembly compatibility are mandatory.

FAQ

What is the clamping voltage of the SM6T36AHM3_B/H at its rated peak pulse current?

The SM6T36AHM3_B/H has a maximum clamping voltage (V_C) of 49.9 V at 12.0 A peak pulse current (I_PPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SM6T36AHM3_B/H maintains this clamping performance across its qualified operating temperature range.

Is the SM6T36AHM3_B/H AEC-Q101 qualified?

Yes, the SM6T36AHM3_B/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code, which denotes halogen-free, RoHS-compliant, and automotive-grade qualification. This includes validation for temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge per AEC-Q101 standards. The SM6T36AHM3_B/H is intended for use in automotive powertrain, chassis, and body electronics.

What does the "_B/H" suffix mean in SM6T36AHM3_B/H?

The "_B/H" suffix in SM6T36AHM3_B/H indicates packaging configuration: "B" denotes tape-and-reel format per EIA-481, and "H" specifies a 7-inch diameter reel containing 750 units. This packaging supports automated SMT placement and aligns with Vishay's preferred delivery mode for high-volume automotive production. The SM6T36AHM3_B/H is supplied in moisture-sensitive level 1 packaging compatible with standard reflow profiles.

How does the SM6T36AHM3_B/H compare to bidirectional TVS diodes in the same series?

The SM6T36AHM3_B/H is unidirectional, meaning it conducts only during reverse-bias transients and blocks forward current-ideal for DC power rail protection. Bidirectional variants (e.g., SM6T36CAHM3_B/H) have symmetrical clamping in both directions and are used on AC or data lines. The SM6T36AHM3_B/H features a cathode band for polarity identification, whereas bidirectional types carry no marking. Electrical parameters like V_BR and P_PPM are identical, but application context dictates polarity choice.

What is the thermal resistance of the SM6T36AHM3_B/H, and how does it affect PCB layout?

The SM6T36AHM3_B/H has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain reliability under repeated surges, PCB layout must provide adequate copper area and thermal vias to minimize junction temperature rise. Exceeding +150 °C junction temperature risks parametric shift; the SM6T36AHM3_B/H's R_θJA value guides minimum pad sizing for target power dissipation.