STMicroelectronics SM15T7V5A

Overview

SM15T7V5A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (30 kV contact/air) and IEC 61000-4-4 surge (4 kV level 4) protection. It features a 7.5 V breakdown voltage (V_BR), 14.5 V clamping voltage (V_CL) at 690 A (8/20 µs), and 0.25 µA max leakage at 6.0 V (25 °C), deployed in DC power rail protection for industrial SMPS and telecom interfaces.

For engineers reviewing the SM15T7V5A datasheet, SM15T7V5A pinout, SM15T7V5A application, or SM15T7V5A equivalent, this page delivers verified electrical parameters, thermal derating behavior, junction capacitance (1.5 nF @ 1 V), SMC mechanical dimensions, and direct alternatives with documented V_BR, V_CL, and I_PP differences.

Technical Context

The SM15T7V5A operates as a planar-junction avalanche diode optimized for fast response (<1 ns) to electrostatic discharge and repetitive surges. Its unidirectional configuration provides forward conduction only during overvoltage events on the cathode-anode path, with low dynamic resistance (0.026 Ω) enabling tight clamping under high-current transients.

Thermal performance is defined by a 150 °C maximum junction temperature and 1250 W peak pulse power capability at T_j = 150 °C (10/1000 µs). The device complies with J-STD-020 MSL Level 1 and UL 497B (QVGQ2.E136224), supporting lead-free reflow per JEDEC J-STD-020 profile up to 245 °C peak.

Key Specifications

Pinout & Package

SM15T7V5A uses the SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length, 5.55–6.25 mm width, 2.45 mm max height, with matte tin-plated leads compliant with IPC-7531 footprint and JEDEC MO-136. Thermal resistance R_th(j-a) is 120 °C/W on standard FR4 PCB with 3.14 cm² copper area per lead.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.5A and P6SMB7.5A, SM15T7V5A delivers 2.3× higher peak current handling (690 A vs. 46.5 A) and full IEC 61000-4-2/4-4 compliance, making it the sole option for industrial-grade 24 V rail protection where sustained surge immunity is mandatory.

Availability

SM15T7V5A is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, automotive body control module (BCM) power rail hardening, and smart meter AC/DC converter input stages requiring stable component supply across multi-year production cycles.

Supply support for SM15T7V5A 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The SM15T series belongs to ST's high-reliability TVS portfolio, engineered specifically for planar-junction surge immunity in space-constrained, high-temperature industrial power systems where low leakage and stable clamping are non-negotiable.

FAQ

What is the maximum clamping voltage of SM15T7V5A under a 690 A 8/20 µs surge?

The maximum clamping voltage is 14.5 V at 690 A for an 8/20 µs waveform, measured at T_j = 25 °C. This value increases with junction temperature at a coefficient of 6.1 × 10⁻⁴ °C⁻¹, reaching 15.2 V at T_j = 125 °C per the α_T parameter in Table 2.

Can SM15T7V5A replace bidirectional TVS diodes like SM15T7V5CA in AC-coupled circuits?

No - SM15T7V5A is unidirectional and conducts only for positive transients on the cathode. In AC-coupled circuits (e.g., RS-485, Ethernet PHY), bidirectional devices like SM15T7V5CA are required to clamp both polarities. Substitution would leave negative transients unprotected and risk catastrophic failure.

How does the 0.25 µA leakage current impact low-power IoT sensor node design?

At 6.0 V reverse bias and 25 °C, the 0.25 µA leakage adds only 1.5 µW to system standby power. This enables use in battery-powered nodes with >10-year shelf life, as confirmed by Figure 9 showing IR remains <10 µA even at 125 °C junction temperature.

Is the SMC package of SM15T7V5A compatible with standard automated optical inspection (AOI) systems?

Yes - the SMC package has a defined marking layout (MDG per Table 6), flat matte tin plating, and JEDEC-compliant outline per MO-136. Its 7.75–8.15 mm length and 5.55–6.25 mm width fall within AOI system detection thresholds for solder joint quality and placement accuracy on FR4 PCBs.