Vishay General Semiconductor - Diodes Division SMBJ58CAHM3_A/H

Overview

SMBJ58CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 58 V standoff voltage (V_WM), 64.4–71.2 V breakdown voltage (V_BR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤93.6 V at 6.4 A peak pulse current - used for protecting MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.

For engineers reviewing the SMBJ58CAHM3_A/H datasheet, SMBJ58CAHM3_A/H pinout, SMBJ58CAHM3_A/H application, or SMBJ58CAHM3_A/H equivalent, this part serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for automotive and industrial surge protection where bidirectional clamping, low clamping ratio, and MSL Level 1 reflow compatibility are required.

Technical Context

This bidirectional TVS operates symmetrically across both polarities, with identical V_BR, V_C, and I_PPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during transient events.

The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance R_θJA = 100 °C/W (on 0.2" × 0.2" copper pads) and R_θJL = 20 °C/W. It meets UL 497B recognition (QVGQ2) and JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow).

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with no anode/cathode designation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ58CAHM3_A/H, the HE3 variant lacks halogen-free certification and AEC-Q101 qualification, while the SMAJ58CAHM3_A/H offers reduced surge capacity and smaller package - neither is a drop-in replacement without validation of thermal margin and clamping performance under full-spec surge conditions.

Availability

SMBJ58CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, consumer USB peripherals, and DC power distribution systems requiring stable component supply with halogen-free and AEC-Q101-compliant surge protection.

Supply support for SMBJ58CAHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.

The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for robust clamping, low leakage, and seamless integration into automated SMT assembly lines.

FAQ

What is the clamping voltage of SMBJ58CAHM3_A/H at its rated peak pulse current?

The SMBJ58CAHM3_A/H clamps to a maximum of 93.6 V when subjected to its rated peak pulse current of 6.4 A under the standardized 10/1000 µs waveform. This value is measured across the device terminals during surge testing and defines the upper voltage limit imposed on the protected circuit during transient events. The SMBJ58CAHM3_A/H maintains this clamping performance consistently across its qualified operating temperature range.

Is SMBJ58CAHM3_A/H suitable for automotive applications?

Yes, SMBJ58CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix (halogen-free, RoHS-compliant, and automotive-grade). It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD robustness per AEC-Q101 requirements. The SMBJ58CAHM3_A/H is commonly deployed in body control modules, ADAS sensor interfaces, and infotainment power supplies where certified reliability is mandatory.

How does the bidirectional configuration of SMBJ58CAHM3_A/H affect its placement on a PCB?

The SMBJ58CAHM3_A/H has no polarity marking and functions identically in both directions, allowing placement across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs (RS-485, CAN), AC-coupled lines, or floating power domains. Unlike unidirectional TVS diodes, the SMBJ58CAHM3_A/H eliminates orientation errors during automated assembly and simplifies layout for balanced transient suppression without ground-reference constraints.

What is the thermal resistance of SMBJ58CAHM3_A/H, and how does it impact power dissipation?

The SMBJ58CAHM3_A/H has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value determines steady-state temperature rise under DC bias: at its rated 5.0 W power dissipation, junction temperature rises ~500 °C above ambient - confirming that SMBJ58CAHM3_A/H is intended for transient-only duty (not continuous power handling). Its design assumes short-duration surges, not sustained overload.

Does SMBJ58CAHM3_A/H meet UL recognition standards?

Yes, SMBJ58CAHM3_A/H carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766 covering both unidirectional and bidirectional variants. This certification validates its suitability for use in safety-critical surge protection circuits within telecommunications, industrial controls, and automotive electronics where third-party safety compliance is required. The SMBJ58CAHM3_A/H meets these standards in its configured SMB package with specified mounting conditions.