Vishay General Semiconductor - Diodes Division SMA6J7.5A-E3/61

Overview

SMA6J7.5A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, with 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, 11.8 V maximum clamping voltage (VC) at 50.8 A peak pulse current (IPP), and 600 W peak pulse power (10/1000 μs). It protects MOSFETs and ICs against inductive switching transients in industrial power supplies.

For engineers reviewing the SMA6J7.5A-E3/61 datasheet, SMA6J7.5A-E3/61 pinout, SMA6J7.5A-E3/61 application, or SMA6J7.5A-E3/61 equivalent, key selection criteria include clamping voltage margin vs. protected device V_DS/V_CC, unidirectional polarity requirement, 600 W surge rating, and SMA package thermal resistance (R_θJA = 120 °C/W).

Technical Context

This TVS operates as a voltage-clamped shunt protector: under normal bias (≤7.5 V), leakage remains ≤1 μA; during transient overvoltage exceeding VBR, it avalanches to clamp reverse voltage at ≤11.8 V while diverting up to 50.8 A (10/1000 μs). Its dynamic resistance (RD = 0.051 Ω) ensures low voltage overshoot during fast surges.

Designed for PCB-level protection of DC rails and signal lines, it leverages the SMA package's MSL Level 1 rating (260 °C reflow), matte tin-plated leads compliant with J-STD-002, and UL 94 V-0 molding compound-enabling reliable automated placement in industrial and telecom assemblies.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, unidirectional, cathode indicated by color band. Dimensions: 4.50 mm × 2.79 mm × 2.20 mm (L × W × H); RoHS-compliant, halogen-free option available (M3 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6J7.5A-E3/61, the M3 variant offers identical protection performance with halogen-free materials, while the SMCJ7.5A-E3/57T delivers 2.5× higher surge capacity but requires 2.5× more PCB area and different thermal management-making SMA6J7.5A-E3/61 optimal for space-constrained 600 W-class industrial designs.

Availability

SMA6J7.5A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply and RoHS-compliant TVS protection.

Supply support for SMA6J7.5A-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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.

The SMA6J series is engineered for surface-mount transient suppression in high-volume industrial and telecom systems, balancing surge robustness, compact size, and automated assembly compatibility.

FAQ

What is the maximum clamping voltage of the SMA6J7.5A-E3/61 under a 10/1000 μs surge?

The SMA6J7.5A-E3/61 has a maximum clamping voltage (VC) of 11.8 V at 50.8 A peak pulse current under a 10/1000 μs waveform. This value is measured per the manufacturer's test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMA6J7.5A-E3/61 achieves this clamping performance while maintaining low dynamic resistance (0.051 Ω), ensuring predictable voltage limiting across its operational current range.

Is the SMA6J7.5A-E3/61 suitable for bidirectional signal line protection?

No, the SMA6J7.5A-E3/61 is unidirectional only, as confirmed in the Vishay datasheet features section and electrical characteristics table. It conducts only during reverse overvoltage events and blocks forward current beyond its VF (~3.5 V at 25 A). For bidirectional protection-such as on USB or RS-485 lines-a symmetric TVS like SMBJ7.5CA or an array-based solution is required. The SMA6J7.5A-E3/61 must be oriented with cathode toward the protected line.

What is the thermal resistance junction-to-ambient (RθJA) for the SMA6J7.5A-E3/61, and how does it affect layout?

The SMA6J7.5A-E3/61 has a typical RθJA of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. This value directly determines allowable power dissipation: at TA = 50 °C, the device supports 4 W continuous dissipation. Layout must provide minimum recommended pad area and avoid thermal isolation; reducing pad size increases junction temperature and risks premature failure during repeated surges. The SMA6J7.5A-E3/61 thermal performance is validated only with specified PCB copper geometry.

Does the SMA6J7.5A-E3/61 meet any industry surge immunity standards?

Yes, the SMA6J7.5A-E3/61 supports compliance with IEC 61000-4-5 (Level 4, 4 kV line-earth) via its 4000 W rating under 8/20 μs waveform, and IEC 61000-4-4 (EFT) through its fast response time (<1 ns) and low clamping voltage. Its 600 W 10/1000 μs rating aligns with IEC 61000-4-5 combination wave testing. These capabilities are intrinsic to the SMA6J7.5A-E3/61 device structure and verified per Vishay's published test methodology-not dependent on external circuitry.

How does the leakage current of the SMA6J7.5A-E3/61 impact low-power sensor circuits?

The SMA6J7.5A-E3/61 exhibits ≤1 μA reverse leakage current at its 7.5 V stand-off voltage (VWM), making it suitable for battery-powered or low-quiescent-current sensor interfaces. This low ID avoids measurable loading on high-impedance bias networks (e.g., thermistor dividers or op-amp inputs) and prevents false triggering in wake-on-event architectures. Verified at TA = 25 °C, leakage remains well below critical thresholds for precision analog front-ends using the SMA6J7.5A-E3/61.