Vishay General Semiconductor - Diodes Division SMBG7.5CA-E3/52

Overview

SMBG7.5CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping voltage transients on signal or power lines. It features a 7.5 V stand-off voltage (V_WM), 8.33–9.21 V breakdown voltage (V_BR) at 1.0 mA test current, 12.9 V maximum clamping voltage (V_C) at 46.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect automotive sensor interfaces and industrial I/O circuits.

For engineers reviewing the SMBG7.5CA-E3/52 datasheet, SMBG7.5CA-E3/52 pinout, SMBG7.5CA-E3/52 application, or SMBG7.5CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (V_C/V_BR ≈ 1.55), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This device operates as a voltage-clamped surge protector in bidirectional mode, with symmetrical avalanche breakdown behavior in both polarities. Its glass-passivated junction ensures stable leakage (<1.0 μA at V_WM) and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.

The SMBG7.5CA-E3/52 is rated for T_J = –55 °C to +150 °C operation, has R_θJA = 100 °C/W (on 0.2" × 0.2" pads), and meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance - confirming suitability for under-hood automotive and harsh-environment industrial deployments.

Key Specifications

Pinout & Package

Package: SMBG (DO-215AA), surface-mount, gull-wing lead form, matte tin-plated terminals solderable per J-STD-002 and JESD22-B102. No polarity marking on bidirectional devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBG7.5CA-E3/52, SMBJ7.5CA offers identical electrical protection but less optimal thermal performance due to larger package footprint and higher R_θJA, while 1.5SMC7.5CA delivers superior surge handling at the cost of AEC-Q101 qualification and SMT placement compatibility.

Availability

SMBG7.5CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.

Supply support for SMBG7.5CA-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 reliability, efficiency, and application-specific optimization.

The SMBG series was developed to deliver AEC-Q101-qualified, low-profile TVS solutions for space-constrained automotive and industrial systems requiring bidirectional surge immunity without sacrificing clamping precision or thermal robustness.

FAQ

What is the clamping voltage of SMBG7.5CA-E3/52 at its rated peak pulse current?

The SMBG7.5CA-E3/52 has a maximum clamping voltage (V_C) of 12.9 V at 46.5 A peak pulse current (I_PPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe voltage limits during surge events. The SMBG7.5CA-E3/52 achieves this with a clamping ratio (V_C/V_BR) of approximately 1.55, reflecting efficient avalanche conduction.

Is SMBG7.5CA-E3/52 suitable for automotive applications?

Yes, SMBG7.5CA-E3/52 is AEC-Q101 qualified and rated for junction temperatures from –55 °C to +150 °C, making it suitable for under-hood and cabin automotive applications. Its bidirectional architecture, low leakage (<1.0 μA), and MSL Level 1 rating support use in engine control units, ADAS sensor interfaces, and body electronics. The SMBG7.5CA-E3/52 meets UL 497B recognition (QVGQ2) and is designed for robustness against ISO 7637-2 and IEC 61000-4-5 transients.

How does the SMBG7.5CA-E3/52 differ from unidirectional variants like SMBG7.5A-E3/52?

The SMBG7.5CA-E3/52 is bidirectional, meaning it clamps transients of either polarity symmetrically, with identical V_BR and V_C characteristics in both directions. In contrast, SMBG7.5A-E3/52 is unidirectional, featuring a cathode band marking and conducting only in reverse bias - requiring correct orientation and offering no protection against positive surges on grounded lines. The SMBG7.5CA-E3/52 eliminates polarity dependency, simplifying layout for AC-coupled or floating signals.

What is the thermal resistance of SMBG7.5CA-E3/52, and how does it affect PCB layout?

The SMBG7.5CA-E3/52 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. This value assumes minimum recommended pad layout per Vishay's outline drawing. To maintain safe junction temperature during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length or isolation. The SMBG7.5CA-E3/52's R_θJL = 20 °C/W further emphasizes the importance of solid thermal connection to internal ground planes.

Does SMBG7.5CA-E3/52 require special handling or baking before reflow soldering?

No, SMBG7.5CA-E3/52 is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C, meaning it can be processed using standard lead-free reflow profiles without prior baking or dry-pack requirements. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and the device passes JESD201 Class 2 whisker testing. This simplifies manufacturing integration for the SMBG7.5CA-E3/52 in high-volume SMT lines.