Vishay General Semiconductor - Diodes Division SMBJ22CHE3/52

Overview

SMBJ22CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V stand-off voltage (V_WM), 24.4–26.9 V breakdown voltage (V_BR) at 1 mA, 35.5 V maximum clamping voltage (V_C) at 16.9 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SMBJ22CHE3/52 datasheet, SMBJ22CHE3/52 pinout, SMBJ22CHE3/52 application, or SMBJ22CHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads per JEDEC standard.

Technical Context

This TVS diode operates as a clamping device that transitions from high-impedance to low-impedance state within <1 ps upon detecting transients exceeding V_WM. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 22 V), while the SMB package provides thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead).

The SMBJ22CHE3/52 is rated for repetitive 0.01% duty cycle surges and supports peak forward surge current (I_FSM) up to 100 A (8.3 ms half-sine). Its temperature coefficient of V_BR is +0.096 %/°C, enabling predictable voltage drift across -55 °C to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (260 °C reflow peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ22AHE3/52, the SMBJ22CHE3/52 adds automotive qualification without electrical trade-offs; versus SAC22, it offers SMT compatibility and 50% higher surge power in half the footprint - critical for modern compact power designs.

Availability

SMBJ22CHE3/52 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power input protection requiring stable component supply across multi-year production cycles.

Supply support for SMBJ22CHE3/52 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 and application-specific performance.

The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where AEC-Q101 validation and repeatable clamping behavior are mandatory.

FAQ

What is the clamping voltage of SMBJ22CHE3/52 at its rated peak pulse current?

The SMBJ22CHE3/52 has a maximum clamping voltage (V_C) of 35.5 V at 16.9 A peak pulse current (I_PPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ22CHE3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal drift due to its +0.096 %/°C V_BR coefficient.

Is SMBJ22CHE3/52 suitable for bidirectional transient protection?

No - SMBJ22CHE3/52 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ22CA). Using SMBJ22CHE3/52 in reverse-biased configurations risks permanent damage, as it lacks symmetrical breakdown characteristics. The SMBJ22CHE3/52 must be oriented with cathode toward the protected line and anode to ground to function correctly.

Does SMBJ22CHE3/52 meet automotive qualification standards?

Yes - SMBJ22CHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 validated versions. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD (HBM ≥ 8 kV, CDM ≥ 1 kV), making SMBJ22CHE3/52 suitable for under-hood and chassis-mounted automotive applications such as engine control units and ADAS sensor modules.

What is the thermal resistance of SMBJ22CHE3/52, and how does it affect PCB layout?

The SMBJ22CHE3/52 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" (5.0 mm × 5.0 mm) copper pads per JEDEC standards. To maintain safe junction temperatures under repetitive surges, PCB layout must provide adequate copper area and minimize trace length between anode/cathode pads and ground/power planes. Reducing R_θJA via thermal vias or larger pads directly improves surge endurance for the SMBJ22CHE3/52.

How does the SMBJ22CHE3/52 compare to standard Zener diodes for transient suppression?

Unlike general-purpose Zener diodes, the SMBJ22CHE3/52 is optimized for high-power transient suppression: it delivers 600 W peak pulse power (vs. typically <5 W for Zeners), responds in <1 ps (vs. nanosecond-scale Zener turn-on), and maintains low dynamic impedance during clamping. The SMBJ22CHE3/52 also features glass passivation for stable leakage (<1 µA at 22 V) and AEC-Q101 qualification - attributes absent in standard Zeners. These traits make SMBJ22CHE3/52 appropriate for IEC 61000-4-5 and ISO 7637-2 compliance, whereas Zeners are unsuitable for such demanding surge events.