Vishay General Semiconductor - Diodes Division SMBJ11CAHE3_A/H

Overview

SMBJ11CAHE3_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 or power lines. It features a 11 V stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤18.2 V at 33 A peak surge current - used for protecting MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.

For engineers reviewing the SMBJ11CAHE3_A/H datasheet, SMBJ11CAHE3_A/H pinout, SMBJ11CAHE3_A/H application, or SMBJ11CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, low clamping ratio (VC/VBR ≈ 1.42), thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.

Technical Context

This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling transient suppression on AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<5 µA at VWM) and fast response time (<1.0 ps), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per JEDEC standards.

The SMBJ11CAHE3_A/H is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and supports peak forward surge current up to 100 A (8.3 ms half-sine, unidirectional only - not applicable here due to bidirectional configuration). It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; 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 voltage suppression applications.

Compared with SMBJ11CAHE3_A/H, SMBJ11CA-M3/52 offers identical protection performance without automotive qualification, while SAC11CA trades surge robustness and thermal performance for smaller size - making SMBJ11CAHE3_A/H the optimal choice for AEC-Q101-mandated or high-energy industrial deployments.

Availability

SMBJ11CAHE3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply with full automotive qualification and long-term lifecycle support.

Supply support for SMBJ11CAHE3_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 delivers high-power transient suppression in compact surface-mount packages, engineered for robustness in automotive, industrial, and telecom systems exposed to harsh electrical environments.

FAQ

What does the "CA" suffix indicate in SMBJ11CAHE3_A/H?

The "CA" suffix denotes a bidirectional configuration - meaning SMBJ11CAHE3_A/H provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ11A), it has no cathode marking and functions identically regardless of polarity applied across its terminals, making it ideal for AC signal lines and floating bus interfaces.

Is SMBJ11CAHE3_A/H suitable for IEC 61000-4-5 surge testing?

Yes - SMBJ11CAHE3_A/H is rated for 600 W peak pulse power with a 10/1000 µs waveform, meeting the energy requirements for IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) when used with appropriate series impedance. Its clamping voltage of ≤18.2 V at 33 A ensures protected circuitry remains within safe operating area during standardized surge events.

How does the HE3 suffix affect SMBJ11CAHE3_A/H compliance status?

The HE3 suffix indicates SMBJ11CAHE3_A/H is RoHS-compliant and AEC-Q101 qualified - verified for automotive use with extended temperature cycling, humidity resistance, and mechanical shock testing. This distinguishes it from commercial-grade variants (e.g., E3 or M3 suffixes) and confirms suitability for under-hood and safety-critical vehicle subsystems.

What is the thermal resistance of SMBJ11CAHE3_A/H, and how does it impact layout?

SMBJ11CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area and avoid excessive trace length; thermal vias under pads are recommended for high-duty-cycle applications.

Can SMBJ11CAHE3_A/H replace SMBJ11A in an existing design?

No - SMBJ11CAHE3_A/H is bidirectional, whereas SMBJ11A is unidirectional with a defined cathode. Substituting them requires verifying circuit topology: SMBJ11CAHE3_A/H may be used where polarity is undefined or AC-coupled, but will not function correctly as a DC rail clamp with directional current flow. Layout changes and functional validation are mandatory before replacement.