Vishay General Semiconductor - Diodes Division SMBJ13CAHE3_A/H

Overview

SMBJ13CAHE3_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 13 V standoff voltage (VWM), 14.4–15.9 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤21.5 V at 27.9 A peak surge current - used to protect MOSFETs, ICs, and sensor signal lines in industrial motor drives.

For engineers reviewing the SMBJ13CAHE3_A/H datasheet, SMBJ13CAHE3_A/H pinout, SMBJ13CAHE3_A/H application, or SMBJ13CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 21.5 V maximum clamping voltage at rated surge current, thermal resistance (R_θJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design for sustained 5.0 W power dissipation.

The SMBJ13CAHE3_A/H delivers 600 W peak pulse power under standardized 10/1000 µs waveform conditions, with fast response time (<1.0 ps) and low incremental surge resistance - critical for protecting sensitive inputs against ESD, inductive switching spikes, and lightning-induced surges in automotive and industrial environments.

Key Specifications

Pinout & Package

Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking on body. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, with cathode/anode symmetry enabling use in AC-coupled or floating signal paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ13CA-E3/52, the SMBJ13CAHE3_A/H adds AEC-Q101 qualification for automotive use; compared with SMCJ13CAHE3_A/H, it trades 2.5× peak power headroom for 30% smaller PCB area and tighter layout constraints in space-constrained modules.

Availability

SMBJ13CAHE3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer appliance control boards requiring stable component supply across multi-year production cycles.

Supply support for SMBJ13CAHE3_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 optimization.

The SMBJ series was developed for high-reliability transient suppression in compact SMT layouts, targeting automotive, industrial, and telecom applications where board space, surge robustness, and qualification compliance are jointly critical.

FAQ

What is the clamping voltage of SMBJ13CAHE3_A/H at its rated peak pulse current?

The SMBJ13CAHE3_A/H has a maximum clamping voltage (VC) of 21.5 V when subjected to its peak pulse current (IPPM) of 27.9 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ13CAHE3_A/H achieves this with a clamping ratio of approximately 1.43 relative to its minimum VBR.

Is SMBJ13CAHE3_A/H suitable for automotive applications?

Yes, SMBJ13CAHE3_A/H is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in Vishay's ordering information notes. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it appropriate for non-safety-critical automotive subsystems such as body electronics, infotainment power rails, and sensor interfaces. It is not intended for airbag or braking systems unless explicitly validated per ISO 26262.

How does the bidirectional configuration of SMBJ13CAHE3_A/H affect its circuit placement?

The SMBJ13CAHE3_A/H has no polarity marking and functions identically in either orientation, allowing placement across floating nodes, AC-coupled signal lines, or differential buses without concern for anode/cathode alignment. This simplifies layout in applications like RS-485, CAN, or LIN transceivers where transients may appear with either polarity - unlike unidirectional variants (e.g., SMBJ13AHE3_A/H), which require correct cathode orientation toward the protected side.

What is the thermal resistance of SMBJ13CAHE3_A/H, and how does it impact PCB design?

The SMBJ13CAHE3_A/H has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under 5.0 W steady-state dissipation or repeated surges, designers must allocate adequate copper area and consider internal layer heatsinking. Failure to meet pad size requirements results in accelerated derating above 25 °C ambient - verified in Figure 2 of the Vishay datasheet 88392.

Can SMBJ13CAHE3_A/H replace SMBJ13AHE3_A/H in an existing design?

No - SMBJ13CAHE3_A/H is bidirectional, while SMBJ13AHE3_A/H is unidirectional with cathode marking and forward voltage drop (~3.5 V at 50 A). Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC or floating lines, whereas unidirectional types are needed for DC rail protection where polarity is fixed and forward conduction must be blocked. Direct replacement risks unintended conduction or inadequate clamping in reverse-biased configurations.