STMicroelectronics SM6T7V5A

Overview

SM6T7V5A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV), with 7.5 V minimum breakdown voltage, 15.2 V clamping voltage at 266 A (8/20 µs), and 600 W peak pulse power (10/1000 µs). It protects MOSFET gates, USB data lines, and industrial sensor interfaces against fast transients.

For engineers reviewing the SM6T7V5A datasheet, SM6T7V5A pinout, SM6T7V5A application, or SM6T7V5A equivalent, this page delivers verified electrical parameters, SMB package layout, real-world clamping behavior, thermal derating curves, and direct alternatives with documented V_BR, V_CL, and I_PP differences - all critical for robust overvoltage design in automotive body electronics and industrial PLC I/O modules.

Technical Context

This TVS diode uses planar silicon technology to achieve low leakage (≤0.2 µA @ 25 °C) and stable clamping up to 150 °C junction temperature. Its dynamic resistance of 0.027 Ω (8/20 µs) ensures minimal voltage overshoot during high-current surges.

The device operates as a voltage-clamped shunt protector: reverse-biased until V_BR (6.4–7.5 V) is exceeded, then rapidly transitions to low-impedance conduction, limiting V_CL to ≤15.2 V at 266 A. It complies with UL497B (file E136224) for isolated loop circuit protection.

Key Specifications

Pinout & Package

SM6T7V5A is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (marked band) and Anode. The package measures 3.30–3.95 mm × 5.10–5.60 mm × 2.45 mm max height and features matte tin-plated leads compliant with J-STD-002 and JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMBJ7.5A and P6SMB7.5A, SM6T7V5A offers the narrowest V_BR range (6.4–7.5 V), UL497B certification for isolated loops, and superior high-temperature leakage performance - making it preferred for precision 3.3 V/5 V interface protection in safety-compliant industrial systems.

Availability

SM6T7V5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, USB host port hardening, and smart meter RS-485 interfaces requiring stable component supply and full compliance traceability.

Supply support for SM6T7V5A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and protection components for automotive, industrial, and consumer markets.

The SM6T series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust ESD and surge protection in harsh environments where low leakage, high T_j, and agency-certified isolation barrier compliance are mandatory.

FAQ

What is the maximum clamping voltage of SM6T7V5A under a 4 kV IEC 61000-4-4 surge?

The SM6T7V5A clamps to ≤15.2 V at 266 A (8/20 µs waveform), which corresponds to a 4 kV IEC 61000-4-4 test level. This value is measured per standard test conditions and remains valid up to 150 °C junction temperature, with V_CL increasing by 6.1×10⁻⁴ per °C above 25 °C per the α_T coefficient.

Can SM6T7V5A be used in bidirectional signal lines like RS-485?

SM6T7V5A is unidirectional and must be paired (anode-to-anode) for bidirectional protection on differential lines. For single-device bidirectional solutions, use SM6T7V5CA - its marking 'LG' and identical electrical specs confirm symmetrical clamping in both polarities, validated per IEC 61000-4-2 testing.

Does SM6T7V5A require derating at elevated ambient temperatures?

Yes - peak pulse power drops from 600 W at 25 °C to 350 W at 150 °C T_j, per Figure 3 in DS0684. Derating depends on PCB copper area: with 2 cm² copper per lead, R_th(j-a) is ~40 °C/W, so at 85 °C ambient, max continuous power must be limited to avoid exceeding 150 °C T_j.

Is the SMB package of SM6T7V5A compatible with automated optical inspection (AOI)?

Yes - the SMB package has a defined marking layout ('DG' per Table 6), flat matte tin plating, and JEDEC-registered outline (MS-012), enabling reliable AOI detection. The cathode band and laser-marked code meet IPC-A-610 Class 2 requirements for industrial assembly verification.