Vishay General Semiconductor - Diodes Division SMB10J26AHM3/I

Overview

SMB10J26AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 26 V stand-off voltage (V_WM), 42.1 V maximum clamping voltage (V_C) at 23.8 A peak pulse current (I_PPM), 1000 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive electronics.

For engineers reviewing the SMB10J26AHM3/I datasheet, SMB10J26AHM3/I pinout, SMB10J26AHM3/I application, or SMB10J26AHM3/I equivalent, this device is selected for robust ESD and lightning surge protection in 12 V/24 V automotive subsystems, industrial sensor interfaces, and DC power rail conditioning where low clamping voltage and fast response (<1 ns) are critical.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector with avalanche breakdown behavior. Its glass-passivated junction ensures stable V_BR (28.9–31.9 V) at 1 mA test current and low incremental surge resistance, enabling consistent clamping under repetitive transients. The device complies with ANSI/IEEE C62.35 for surge testing and meets J-STD-020 MSL Level 1 reflow profile (260 °C peak).

Thermally, it exhibits R_θJA = 72 °C/W (typ.) and R_θJL = 20 °C/W (typ.), supporting reliable operation up to T_J = +150 °C. The matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, and the halogen-free, RoHS-compliant HM3 suffix confirms compliance with automotive-grade material requirements.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile (max height 1.95 mm), UL 94 V-0 molded compound, cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMB10J26AHM3/I, SMBJ26AHE3/A/H lacks halogen-free certification and automotive qualification, limiting its use in Tier 1 supply chains; SMCJ26A-QH offers higher surge capacity but increases board area and thermal mass-making SMB10J26AHM3/I optimal for space-constrained AEC-Q101-compliant 24 V nodes.

Availability

SMB10J26AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor conditioning, and DC power rail protection requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for SMB10J26AHM3/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 designs and manufactures discrete semiconductors, including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power density, and automotive-grade qualification.

The SMB10J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, surface-mount surge protection in harsh automotive and industrial environments where compact size and AEC-Q101 compliance are mandatory.

FAQ

What is the clamping voltage of SMB10J26AHM3/I at its rated peak pulse current?

The SMB10J26AHM3/I has a maximum clamping voltage (V_C) of 42.1 V when subjected to its rated peak pulse current (I_PPM) of 23.8 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay Document Number 88422, Table "UNIDIRECTIONAL" on page 2. The low V_C ensures protected circuits remain within safe operating limits during surge events.

Is SMB10J26AHM3/I suitable for automotive applications?

Yes, SMB10J26AHM3/I is AEC-Q101 qualified and carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction meeting automotive material requirements. It is explicitly rated for operating junction temperatures from -55 °C to +150 °C and validated for reliability tests including HTGB and temperature cycling. These attributes make SMB10J26AHM3/I appropriate for under-hood and cabin modules in passenger vehicles and commercial vehicles.

What does the "HM3/I" suffix mean in SMB10J26AHM3/I?

The "HM3" portion denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction; "/I" specifies packaging in 13-inch diameter plastic tape and reel with a base quantity of 3200 units. This ordering code aligns with Vishay's standardized delivery format for high-volume automotive production, ensuring compatibility with automated SMT placement equipment and traceable lot control per IATF 16949 requirements.

How does SMB10J26AHM3/I compare to bidirectional TVS diodes with the same V_WM?

SMB10J26AHM3/I is unidirectional and optimized for DC power line protection where polarity is fixed (e.g., 24 V supply to ground). Bidirectional variants like SMB8J26CA offer symmetric clamping for AC or floating signal lines but have lower P_PPM (800 W vs. 1000 W) and higher V_C under equivalent surge conditions. For 24 V automotive rails, SMB10J26AHM3/I delivers superior energy handling and tighter clamping than its bidirectional counterparts.

What is the thermal resistance of SMB10J26AHM3/I, and how does it affect layout design?

SMB10J26AHM3/I has a typical junction-to-ambient thermal resistance (R_θJA) of 72 °C/W and junction-to-lead resistance (R_θJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per terminal. To maintain T_J ≤ 150 °C under worst-case 1000 W pulses, PCB layout must provide adequate copper area and minimize thermal isolation. Use of internal ground/power planes and thermal vias beneath the SMB pad is strongly recommended for sustained surge duty cycles.