Vishay General Semiconductor - Diodes Division SMB8J10CA-E3/52

Overview

SMB8J10CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 10 V standoff voltage (V_WM), 17.0 V clamping voltage (V_C) at 10 A peak pulse current, and 800 W peak pulse power (10/1000 µs waveform). It protects signal lines and power rails in automotive sensor interfaces and industrial I/O modules.

For engineers reviewing the SMB8J10CA-E3/52 datasheet, SMB8J10CA-E3/52 pinout, SMB8J10CA-E3/52 application, or SMB8J10CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1 µA at V_WM), thermal resistance (R_θJA = 72 °C/W), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.

Technical Context

This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at 10 V), but triggers into low-impedance conduction when transient voltage exceeds its 11.1–12.3 V breakdown range (V_BR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns).

Designed for unclamped inductive switching transients and ESD events per IEC 61000-4-2, the SMB8J10CA-E3/52 delivers 10 A peak pulse current (I_PPM) with 17.0 V clamping-enabling robust protection of 3.3 V and 5 V logic interfaces without overstressing downstream ICs.

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), with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10CA-E3/52 and SMCJ10CA-E3/52, the SMB8J10CA-E3/52 uniquely balances bidirectional functionality, AEC-Q101 qualification, and SMB footprint-making it optimal for space-constrained automotive signal-line protection where polarity is undefined or alternating.

Availability

SMB8J10CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, USB port protection, and RS-485 transceiver circuits requiring stable component supply, AEC-Q101 compliance, and high-reliability surge immunity.

Supply support for SMB8J10CA-E3/52 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 automotive, industrial, and computing applications.

The SMB8J series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, surface-mount transient suppression in harsh environments where AEC-Q101 reliability and fast clamping response are mandatory.

FAQ

What is the clamping voltage of SMB8J10CA-E3/52 and how does it protect downstream components?

The SMB8J10CA-E3/52 has a maximum clamping voltage (V_C) of 17.0 V at 10 A peak pulse current (10/1000 µs waveform). This means that during a surge event, the device limits the voltage seen by protected circuitry to ≤17.0 V-well below typical absolute maximum ratings of 3.3 V or 5 V logic ICs when used with appropriate series impedance. The low incremental surge resistance ensures rapid voltage stabilization, preventing latch-up or gate oxide damage in sensitive receivers and transceivers.

Is SMB8J10CA-E3/52 suitable for automotive applications and what qualifications does it hold?

Yes, SMB8J10CA-E3/52 is AEC-Q101 qualified and rated for operation from -55 °C to +150 °C. It meets automotive reliability requirements including high-temperature operating life (HTOL), temperature cycling, unbiased highly accelerated stress test (UHAST), and human-body-model ESD (≥8 kV contact). Its RoHS-compliant, halogen-free construction (E3 suffix) and MSL Level 1 rating make it suitable for under-hood ECUs, body control modules, and ADAS sensor interfaces.

How does the bidirectional configuration of SMB8J10CA-E3/52 differ from unidirectional TVS diodes like SMBJ10CA-E3/52?

The SMB8J10CA-E3/52 has symmetrical bidirectional breakdown characteristics-no cathode band marking-and conducts equally for positive or negative transients. In contrast, SMBJ10CA-E3/52 is unidirectional with defined anode/cathode polarity and only suppresses reverse-biased surges. This makes SMB8J10CA-E3/52 ideal for AC-coupled lines (e.g., CAN, LIN, RS-485) or floating references where voltage polarity is undefined, eliminating risk of incorrect orientation during assembly.

What is the thermal resistance of SMB8J10CA-E3/52 and how does it affect PCB layout?

The SMB8J10CA-E3/52 has a typical junction-to-ambient thermal resistance (R_θJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repeated surges, designers must provide adequate copper area and consider thermal vias beneath the pads. Reducing pad size or omitting thermal relief increases R_θJA, potentially causing premature thermal shutdown or parametric shift during high-duty-cycle transients.

Can SMB8J10CA-E3/52 be used for ESD protection in USB 2.0 applications?

Yes, SMB8J10CA-E3/52 is suitable for secondary ESD protection on USB 2.0 D+ and D− lines due to its low junction capacitance (typ. <1 pF at zero bias), fast response time (<1 ns), and ability to suppress ±15 kV contact discharge per IEC 61000-4-2. Its 10 V standoff voltage provides sufficient margin above USB's 3.3 V signaling level, while 17.0 V clamping prevents damage to PHY transceivers without degrading signal edge rates at 480 Mbps.