Vishay General Semiconductor - Diodes Division SMBJ70CAHE3/52

Overview

SMBJ70CAHE3/52 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 power and signal lines. It features a 70 V standoff voltage (V_WM), 77.8–86.0 V breakdown range (V_BR at 1 mA), 113 V maximum clamping voltage (V_C) at 5.3 A peak pulse current, and 600 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.

For engineers reviewing the SMBJ70CAHE3/52 datasheet, SMBJ70CAHE3/52 pinout, SMBJ70CAHE3/52 application, or SMBJ70CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, 113 V clamping voltage at 5.3 A, AEC-Q101 qualification status, RoHS-compliant HE3 suffix, and SMB package thermal resistance (R_θJA = 100 °C/W).

Technical Context

This bidirectional TVS diode 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 leakage (<1.0 µA at V_WM) and fast response time (<1.0 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.

The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2. With R_θJL = 20 °C/W and R_θJA = 100 °C/W, thermal performance depends critically on PCB copper pad area (0.2" × 0.2" recommended), and it meets MSL Level 1 per J-STD-020 at 260 °C peak reflow.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ70CAHE3/52, SMBJ70CA-E3/52 offers identical electrical performance but lacks automotive qualification, while SAC70CA trades surge capacity and thermal robustness for footprint reduction-making SMBJ70CAHE3/52 the optimal choice for AEC-Q101–mandated, high-energy protection tasks.

Availability

SMBJ70CAHE3/52 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom line cards, and consumer power adapters requiring stable component supply across extended production lifecycles.

Supply support for SMBJ70CAHE3/52 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 validation.

The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness and AEC-Q101 compliance are mandatory.

FAQ

What is the clamping voltage of SMBJ70CAHE3/52 at its rated peak pulse current?

The SMBJ70CAHE3/52 has a maximum clamping voltage (V_C) of 113 V at 5.3 A peak pulse current (I_PPM) under the 10/1000 µs waveform condition. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ70CAHE3/52 maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.

Is SMBJ70CAHE3/52 suitable for automotive applications?

Yes, SMBJ70CAHE3/52 is AEC-Q101 qualified, as indicated by the "HE3" suffix, and is explicitly validated for automotive use per Vishay's documentation. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness. The SMBJ70CAHE3/52 is commonly deployed in engine control modules, body control units, and infotainment power rails where sustained reliability under thermal and electrical stress is critical.

How does the bidirectional configuration of SMBJ70CAHE3/52 affect circuit design?

The SMBJ70CAHE3/52 has no polarity marking and delivers identical electrical characteristics in both directions-V_BR, V_C, and I_PPM are symmetric. This eliminates orientation constraints during placement and simplifies layout for AC-coupled lines, floating grounds, or differential buses. Unlike unidirectional TVS diodes, the SMBJ70CAHE3/52 requires no cathode alignment check, reducing assembly errors and enabling reuse across dual-polarity protection schemes.

What is the thermal resistance of SMBJ70CAHE3/52, and how does it impact PCB layout?

The SMBJ70CAHE3/52 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 repetitive surges or elevated ambient conditions, designers must adhere to this pad layout. Reducing pad area increases R_θJA, risking thermal runaway; the SMBJ70CAHE3/52's R_θJL of 20 °C/W further emphasizes the need for solid thermal connection to internal ground planes.

Does SMBJ70CAHE3/52 meet RoHS and lead-free soldering requirements?

Yes, the "HE3" suffix confirms SMBJ70CAHE3/52 is RoHS-compliant and compatible with lead-free reflow profiles up to 260 °C peak temperature (MSL Level 1 per J-STD-020). Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and whisker resistance is certified to JESD 201 Class 2. The SMBJ70CAHE3/52 is fully compliant for use in environmentally regulated markets including EU, China, and South Korea.