Vishay General Semiconductor - Diodes Division SMA5J7.5C-E3/61

Overview

SMA5J7.5C-E3/61 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) 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), 12.9 V maximum clamping voltage (V_C) at 38.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor protection and industrial I/O interface surge suppression.

For engineers reviewing the SMA5J7.5C-E3/61 datasheet, SMA5J7.5C-E3/61 pinout, SMA5J7.5C-E3/61 application, or SMA5J7.5C-E3/61 equivalent, key selection criteria include bi-directional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This bi-directional TVS operates symmetrically in both reverse and forward directions, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at V_WM) and fast response time (<1.0 ns), while low incremental surge resistance supports effective energy diversion during ESD or lightning-induced transients.

The device is rated for continuous operation from −55 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 (peak reflow 260 °C). Its thermal resistance (R_θJA = 80 °C/W) and R_θJL = 25 °C/W are specified under standard PCB mounting conditions using minimum recommended pad layout.

Key Specifications

Pinout & Package

DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking (bi-directional).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA5J7.5CA-E3/61 (identical function) and SMC5J7.5CA (higher-power alternative), SMA5J7.5C-E3/61 delivers best-in-class power density for space-constrained bi-directional protection, with verified AEC-Q101 compliance and MSL Level 1 reflow readiness - critical for automotive module production.

Availability

SMA5J7.5C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, RoHS-compliant packaging, and AEC-Q101 assurance.

Supply support for SMA5J7.5C-E3/61 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, TVS devices, and MOSFETs with emphasis on reliability, power density, and automotive qualification.

The SMA5J series is engineered for high-energy transient suppression in compact surface-mount formats, targeting automotive, industrial, and communications systems where board space, thermal performance, and AEC-Q101 compliance are mandatory design requirements.

FAQ

What is the polarity configuration of SMA5J7.5C-E3/61?

SMA5J7.5C-E3/61 is a bi-directional transient voltage suppressor, meaning it functions identically in both forward and reverse bias directions. Unlike uni-directional variants (e.g., SMA5J7.5A), it has no cathode band marking and provides symmetrical clamping for AC signals or differential lines. This makes SMA5J7.5C-E3/61 ideal for protecting bidirectional interfaces such as RS-485 or CAN without polarity concerns.

Does SMA5J7.5C-E3/61 meet automotive qualification standards?

Yes, SMA5J7.5C-E3/61 is AEC-Q101 qualified, as confirmed in Vishay's official datasheet (Document Number: 88875, Revision: 24-Oct-12). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is critical. The "HE3" suffix denotes AEC-Q101 grade, but SMA5J7.5C-E3/61 shares identical qualification status per Vishay's product family documentation.

What is the maximum clamping voltage of SMA5J7.5C-E3/61 under surge conditions?

The maximum clamping voltage (V_C) of SMA5J7.5C-E3/61 is 12.9 V, measured at its peak pulse current (I_PPM) of 38.8 A under a 10/1000 µs waveform. This value represents the highest voltage that will appear across the device during a standardized surge event - a critical parameter for ensuring downstream ICs (e.g., microcontrollers or transceivers) remain within their absolute maximum ratings. The low V_C relative to V_WM reflects efficient energy absorption.

Is SMA5J7.5C-E3/61 compatible with lead-free reflow processes?

Yes, SMA5J7.5C-E3/61 is rated for MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and it passes JESD 201 Class 1A whisker testing. These specifications confirm full compatibility with standard lead-free reflow profiles used in modern SMT assembly, eliminating need for pre-baking or special handling.

How does the junction capacitance of SMA5J7.5C-E3/61 affect high-speed signal lines?

SMA5J7.5C-E3/61 exhibits typical junction capacitance of <1.0 pF at zero bias and <10 pF at V_WM = 7.5 V (per Vishay's characteristic curves), making it suitable for high-speed interfaces up to 100 Mbps. This low capacitance minimizes signal rise-time degradation and reflection on data lines such as USB 2.0 or RS-422. For applications above 1 Gbps, additional layout optimization (e.g., controlled impedance traces, minimized stub length) is recommended alongside SMA5J7.5C-E3/61 placement.