STMicroelectronics SM6T150A

Overview

SM6T150A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for robust ESD and surge protection of signal/power lines. It delivers 600 W peak pulse power (10/1000 µs), clamps at 207 V (max) under 2.9 A IPP, and operates up to 150 °C junction temperature-used in industrial power supplies and telecom interface circuits.

For engineers reviewing the SM6T150A datasheet, SM6T150A pinout, SM6T150A application, or SM6T150A equivalent, key selection criteria include clamping voltage (V_CL), peak pulse current (I_PP), leakage current (0.2 µA @ 25 °C), operating temperature range (–55 to +150 °C), and UL497B recognition for isolated loop protection.

Technical Context

This TVS diode uses planar silicon technology to achieve low leakage (≤0.2 µA @ 25 °C) and stable clamping performance across –55 to +150 °C junction temperatures. Its dynamic resistance (R_D = 7.13 Ω) ensures precise voltage limiting during fast transients like IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 level 4 surges (4 kV).

The device exhibits bidirectional capability only in CA variants; SM6T150A is strictly unidirectional with anode-cathode polarity. Clamping voltage increases linearly with junction temperature via α_T = 10.8 × 10^–4/°C, enabling accurate system-level overvoltage margining in high-temperature environments.

Key Specifications

Pinout & Package

SM6T150A is housed in an SMB (DO-214AA) surface-mount package measuring 3.30–3.95 mm × 5.10–5.60 mm × 1.90–2.45 mm (L × W × H), with matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ150A and P6SMB150A, SM6T150A offers UL497B certification for isolated loop protection and lower leakage (0.2 µA vs. typical 1 µA), making it preferable for precision analog front-ends and safety-compliant telecom interfaces.

Availability

SM6T150A is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, automotive body control modules, and smart meter AC/DC power stages requiring stable component supply and long-term lifecycle support.

Supply support for SM6T150A 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.

The SM6T series belongs to ST's transient protection portfolio, engineered specifically for high-reliability ESD and surge suppression in space-constrained, high-temperature applications such as industrial SMPS and telecom infrastructure.

FAQ

What is the maximum clamping voltage of SM6T150A under a 10/1000 µs surge?

The maximum clamping voltage (V_CL) of SM6T150A is 207 V when subjected to a 2.9 A peak pulse current with a 10/1000 µs waveform. This value is measured at T_amb = 25 °C and scales with junction temperature using α_T = 10.8 × 10^–4/°C, ensuring predictable overvoltage limiting across its full operating range.

Is SM6T150A suitable for bidirectional signal line protection?

No-SM6T150A is a unidirectional TVS diode intended for DC-biased lines where current flows in one direction only. For bidirectional protection (e.g., AC-coupled data lines), the SM6T150CA variant must be used, which features symmetrical breakdown characteristics and identical packaging.

Does SM6T150A comply with lead-free soldering standards?

Yes-SM6T150A features matte tin-plated leads qualified to J-STD-002 and MIL-STD-750 method 2026, and is compatible with standard Pb-free reflow profiles up to 245 °C peak temperature (per J-STD-020 MSL level 1). Its ECOPACK2-compliant construction meets RoHS and REACH requirements.

How does SM6T150A perform under high-temperature operating conditions?

SM6T150A maintains full functionality up to 150 °C junction temperature, with leakage rising to 1 µA at 85 °C and clamping voltage increasing predictably via α_T = 10.8 × 10^–4/°C. Its planar silicon structure ensures stable V_BR and R_D (7.13 Ω) across temperature, supporting reliable surge suppression in thermally demanding environments.