Vishay General Semiconductor - Diodes Division SM6T36AHE3_B/H

Overview

SM6T36AHE3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 36 V breakdown voltage (V_BR = 34.2–37.8 V at 1.0 mA), 49.9 V clamping voltage at 12.0 A peak pulse current (10/1000 μs), and 600 W peak pulse power. It provides robust ESD and surge protection for automotive sensor signal lines and power rails.

For engineers reviewing the SM6T36AHE3_B/H datasheet, SM6T36AHE3_B/H pinout, SM6T36AHE3_B/H application, or SM6T36AHE3_B/H equivalent, key selection factors include its AEC-Q101 qualification, low clamping ratio (1.39), 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads suitable for J-STD-002 soldering.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction to achieve fast response (<1 ns) to transients. Its 100 °C/W junction-to-ambient thermal resistance requires careful PCB pad design (0.2" × 0.2" copper per terminal) to sustain 5.0 W steady-state dissipation at 50 °C ambient.

The SM6T36AHE3_B/H delivers precise standoff voltage (V_WM = 30.8 V), reverse leakage <1.0 μA at V_WM, and stable clamping performance across -65 °C to +150 °C operating range-enabling reliable protection in automotive engine control units and industrial motor drives where thermal cycling and high-energy surges coexist.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band on body end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ36A-E3/5B and 1.5SMC36A, the SM6T36AHE3_B/H uniquely combines AEC-Q101 qualification, SMB footprint compactness, and 600 W surge capability-making it optimal for space-constrained automotive ECUs where reliability and standardized reflow compatibility are mandatory.

Availability

SM6T36AHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drive control inputs, and telecom power interface protection requiring stable component supply and long-term lifecycle assurance.

Supply support for SM6T36AHE3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices for industrial, automotive, and computing markets.

The SM6T Series targets high-reliability transient suppression in harsh environments, with emphasis on AEC-Q101 compliance, low-inductance packaging, and repeatable clamping performance across temperature and lifetime.

FAQ

What is the clamping voltage of the SM6T36AHE3_B/H at its rated peak pulse current?

The SM6T36AHE3_B/H has a maximum clamping voltage (V_C) of 49.9 V when subjected to a 10/1000 μs waveform at 12.0 A peak pulse current (I_PPM). This value is measured per JEDEC standards and guarantees that downstream circuitry remains below critical overvoltage thresholds during surge events. The SM6T36AHE3_B/H maintains this clamping performance across its full operating temperature range of -65 °C to +150 °C.

Is the SM6T36AHE3_B/H qualified for automotive applications?

Yes, the SM6T36AHE3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88385. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-ensuring suitability for automotive powertrain, chassis, and body electronics. The SM6T36AHE3_B/H meets these requirements in its SMB package with matte tin-plated leads.

What does the "_B/H" suffix mean in SM6T36AHE3_B/H?

The "_B/H" suffix in SM6T36AHE3_B/H indicates packaging configuration: "B" denotes tape-and-reel revision level (e.g., revision B of the reel specification), and "H" specifies the preferred package code for 7-inch diameter plastic tape and reel, containing 750 units per reel. This matches Vishay's ordering information table and confirms the part is supplied in standard SMT-compatible format ready for automated assembly. The SM6T36AHE3_B/H is RoHS-compliant and AEC-Q101 qualified.

How does the SM6T36AHE3_B/H compare to bidirectional TVS diodes like SM6T36CA?

The SM6T36AHE3_B/H is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., 24 V supply rails or sensor outputs referenced to ground). In contrast, SM6T36CA is bidirectional and used on AC-coupled or floating signal lines like RS-485 or CAN bus. The SM6T36AHE3_B/H offers lower leakage (<1.0 μA at 30.8 V) and tighter V_BR tolerance than its bidirectional counterpart, making it preferable for precision analog protection where reverse conduction must be avoided.

What PCB layout guidance applies to the SM6T36AHE3_B/H for optimal thermal performance?

Vishay specifies mounting the SM6T36AHE3_B/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 5.0 W power dissipation at 50 °C ambient. Minimizing trace length and maximizing copper area connected to anode and cathode pads reduces thermal resistance and prevents localized heating during surge events. The SM6T36AHE3_B/H thermal resistance is 100 °C/W junction-to-ambient under these conditions-exceeding this pad size improves heat spreading but is not required for nominal operation.