STMicroelectronics SM15T10A

Overview

SM15T10A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection of DC power rails and signal lines. It features 10 V breakdown voltage (V_BR = 8.55–10.5 V), 14.5 V clamping voltage at 1 A (V_CL), and low leakage current (10 µA max at 25 °C), enabling reliable overvoltage protection in industrial power supplies and telecom interfaces.

For engineers reviewing the SM15T10A datasheet, SM15T10A pinout, SM15T10A application, or SM15T10A equivalent, this page delivers verified electrical parameters, thermal derating behavior, SMC package layout, real-world clamping performance under 10/1000 µs and 8/20 µs transients, and validated alternatives for high-reliability surge protection design.

Technical Context

The SM15T10A uses planar silicon avalanche junction technology to achieve stable breakdown with tight V_BR tolerance (±10 %) and low dynamic resistance (R_D = 0.039 Ω at 25 °C). Its unidirectional configuration supports DC-biased lines where reverse conduction must be blocked, and its junction temperature range (−55 to +150 °C) enables operation in thermally demanding environments such as enclosed power converters.

Clamping voltage scales linearly with temperature via α_T = 7.3 × 10⁻⁴/°C, and peak pulse power drops from 1500 W at T_j = 25 °C to 1250 W at T_j = 150 °C (10/1000 µs), allowing accurate thermal margining in PCB-level surge analysis without iterative simulation.

Key Specifications

Pinout & Package

SM15T10A is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked side) and Anode. The package complies with IPC7531 footprint and JEDEC MO-136AC outline, featuring 7.75–8.15 mm body width (E), 5.55–6.25 mm length (D), and 1.90–2.45 mm height (A1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ10A and 1.5KE10A, SM15T10A provides superior surge margin (1500 W vs. 600 W), tighter clamping (14.5 V vs. 16.7 V), and SMT-ready SMC packaging with MSL1 and whisker-free finish-making it optimal for high-volume, high-reliability industrial and automotive designs.

Availability

SM15T10A is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, automotive body control modules, and smart meter power input stages requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SM15T10A 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, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The SM15T series belongs to ST's high-power TVS diode portfolio, engineered specifically for robust, low-leakage transient suppression in harsh-environment applications where thermal stability and IEC/ISO compliance are mandatory.

FAQ

What is the maximum clamping voltage of SM15T10A under a 10/1000 µs surge?

The maximum clamping voltage (V_CL) of SM15T10A is 14.5 V at 1 A (10/1000 µs), measured at T_j = 25 °C. This value increases linearly with junction temperature at α_T = 7.3 × 10⁻⁴/°C, reaching ~15.2 V at T_j = 125 °C. It is specified in Table 2 of DS0683 Rev 8 and validated per IEC 61000-4-5 test conditions.

Is SM15T10A suitable for bidirectional signal line protection?

No - SM15T10A is unidirectional and only protects against positive-going transients on DC-biased lines. For bidirectional protection (e.g., RS-485, USB), the SM15T10CA variant must be used. The "A" suffix denotes unidirectional configuration; "CA" indicates bidirectional symmetry with identical clamping in both polarities.

Does SM15T10A meet RoHS and REACH requirements?

Yes - SM15T10A carries ST's ECOPACK2 qualification, confirming full RoHS compliance (Pb-free matte tin plating) and adherence to REACH SVHC thresholds. It meets J-STD-002 and JESD22-B102 E3 solderability standards, and passes JESD201 Class 2 whisker testing, as documented in DS0683 Rev 8 section 2.1.

What is the recommended PCB footprint for SM15T10A?

The recommended footprint follows IPC7531 and JEDEC MO-136AC outlines: 8.19 mm pad length, 3.14 mm pad width, 5.11 mm center-to-center spacing, and 1.54 mm solder mask opening per pad. Copper area under each lead should exceed 2 cm² to maintain R_th(j-a) ≤ 100 °C/W, per Figure 12 in DS0683 Rev 8.