Vishay General Semiconductor - Diodes Division SM6T22AHE3_B/I

Overview

SM6T22AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in SMB (DO-214AA) package, with 22 V breakdown voltage (V_BR = 20.9–23.1 V at 1 mA), 30.6 V clamping voltage (V_C) at 20 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use. It protects MOSFETs and sensor signal lines against inductive switching transients.

For engineers reviewing the SM6T22AHE3_B/I datasheet, SM6T22AHE3_B/I pinout, SM6T22AHE3_B/I application, or SM6T22AHE3_B/I equivalent, key selection factors include unidirectional polarity, 18.8 V stand-off voltage (V_WM), 1.0 μA max reverse leakage at V_WM, 100 °C/W junction-to-ambient thermal resistance, and RoHS-compliant, halogen-free construction with matte tin-plated leads.

Technical Context

This device operates as a unidirectional TVS diode, leveraging a glass-passivated silicon junction to achieve fast response (<1 ns) to ESD and surge events. Its clamping behavior is defined by a 10/1000 μs waveform test condition, with guaranteed V_C ≤ 30.6 V at I_PPM = 20 A and thermal derating above T_A = 25 °C per Fig. 2.

The SM6T22AHE3_B/I is rated for -65 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and is qualified to AEC-Q101 - confirming suitability for under-hood automotive electronics where reliability under thermal cycling and mechanical stress is critical.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band on body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and 1.5SMC22A, SM6T22AHE3_B/I uniquely combines AEC-Q101 qualification, SMB footprint density, and 600 W capability - making it optimal for space-constrained automotive modules requiring certified reliability.

Availability

SM6T22AHE3_B/I is available at Aetrix Electronics and suitable for automotive power supply protection, industrial sensor interface protection, and telecom line card surge suppression requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for SM6T22AHE3_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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.

The SM6T Series is designed specifically for robust, surface-mount transient voltage suppression in automotive, industrial, and communications systems - prioritizing AEC-Q101 compliance, low clamping voltage, and automated assembly compatibility.

FAQ

What is the clamping voltage of SM6T22AHE3_B/I at its rated peak pulse current?

The SM6T22AHE3_B/I has a maximum clamping voltage (V_C) of 30.6 V when subjected to a 10/1000 μs waveform peak pulse current of 20 A. This value is measured under standardized test conditions per JEDEC and is guaranteed across the operating temperature range. The low clamping ratio (V_C/V_BR ≈ 1.33) confirms efficient transient suppression for the SM6T22AHE3_B/I.

Is SM6T22AHE3_B/I qualified for automotive applications?

Yes, SM6T22AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" (RoHS-compliant and AEC-Q101 qualified). It undergoes stress testing including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its use in engine control units, body electronics, and ADAS modules where SM6T22AHE3_B/I must survive harsh thermal and vibration environments.

What does the "_B/I" suffix mean in SM6T22AHE3_B/I?

The "_B/I" suffix in SM6T22AHE3_B/I indicates packaging configuration: "B" denotes the revision level (Revision B per Vishay document 88385), and "I" specifies 13-inch diameter plastic tape and reel delivery containing 3200 units. This format ensures compatibility with high-speed pick-and-place equipment and supports volume manufacturing requirements for the SM6T22AHE3_B/I.

What is the standoff voltage (V_WM) of SM6T22AHE3_B/I, and why does it matter?

The standoff voltage (V_WM) of SM6T22AHE3_B/I is 18.8 V - the maximum DC or continuous reverse voltage that can be applied without exceeding 1.0 μA leakage current. This parameter ensures the SM6T22AHE3_B/I remains non-conductive during normal operation (e.g., on a 12 V automotive rail), avoiding power loss or false triggering while still responding instantly to transients exceeding V_BR.

How does the SMB (DO-214AA) package of SM6T22AHE3_B/I compare to SMA or SMC alternatives?

The SMB package of SM6T22AHE3_B/I measures 3.94 mm × 2.20 mm × 1.52 mm - smaller than SMA (4.57 mm × 2.79 mm) and SMC (6.22 mm × 4.57 mm). This enables higher board density and lower parasitic inductance, critical for fast transient response. While SMC offers higher surge current handling, the SMB footprint of SM6T22AHE3_B/I balances compactness, thermal performance (R_θJA = 100 °C/W), and AEC-Q101 compliance in one optimized solution.