STMicroelectronics SMTYF5.0A

Overview

SMTYF5.0A from STMicroelectronics is a unidirectional low-forward-voltage TVS diode in SMAflat (DO-221AC) package, designed for ESD protection in portable electronics. It features 5 V stand-off voltage, 0.48 V forward voltage at 0.85 A, 6.4–7.07 V clamping voltage at 10 A (10/1000 µs), and 600 W peak pulse power, enabling robust transient suppression in space-constrained USB, audio jack, and SIM card interfaces.

For engineers reviewing the SMTYF5.0A datasheet, SMTYF5.0A pinout, SMTYF5.0A application, or SMTYF5.0A equivalent, key selection criteria include clamping factor (V_CL/V_BR ≈ 1.28), ultra-thin 1.0 mm height, ECOPACK2® halogen-free compliance, and IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) ESD rating.

Technical Context

The SMTYF5.0A integrates a Transil™-class TVS structure with a low-V_F Schottky junction in a monolithic planar device, enabling simultaneous ESD clamping and low-loss DC path conduction. Its 5 V stand-off voltage ensures compatibility with 3.3 V and 5 V logic rails, while the 20 °C/W junction-to-leads thermal resistance supports sustained surge handling under PCB-constrained thermal conditions.

It operates across –40 °C to +175 °C junction temperature, with leakage current ≤10 µA at 5 V and dynamic resistance of 0.029 Ω (10/1000 µs), allowing precise clamping prediction via V_CL = R_D × I_PP + V_BR(max). The 1.0 mm profile meets miniaturization demands in smartphones, wearables, and IoT sensor nodes.

Key Specifications

Pinout & Package

Package: SMAflat (JEDEC DO-221AC), surface-mount, unidirectional, cathode indicated by band. Overall height ≤1.0 mm, footprint optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-V_F TVS applications.

Compared with SMAJ5.0A and TPD4E001DPYR, SMTYF5.0A uniquely combines sub-0.5 V forward drop, 600 W surge rating, and 1.0 mm profile-making it optimal for space- and efficiency-critical DC-biased I/O protection where discrete Schottky + TVS stacking is unacceptable.

Availability

SMTYF5.0A is available at Aetrix Electronics and suitable for USB 2.0 interface protection, smartphone audio jack hardening, and SIM card module safeguarding requiring stable component supply across high-mix, low-volume production runs.

Supply support for SMTYF5.0A 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.

SMTYF belongs to ST's Transky™ family of integrated TVS-Schottky devices, engineered specifically for ESD-hardened portable electronics where board area, thermal performance, and DC conduction efficiency are simultaneously constrained.

FAQ

What is the maximum continuous reverse working voltage for SMTYF5.0A?

The maximum continuous reverse working voltage (V_RM) is 5 V, verified per Table 4 in the official ST datasheet. This value defines the highest DC or RMS voltage the device can block without entering breakdown during normal operation, and must not be exceeded to ensure reliable ESD protection without leakage-induced power loss or thermal stress.

Can SMTYF5.0A be used in bidirectional signal lines?

No - SMTYF5.0A is unidirectional, with cathode band marking and specified only for anode-to-cathode forward conduction. For bidirectional protection (e.g., RS-485, CAN), a symmetric TVS like SMBJ5.0CA or dedicated bidirectional array must be used; this part's electrical characteristics and monolithic structure are optimized exclusively for single-polarity DC-biased lines.

How does the 1.0 mm height impact PCB layout and thermal performance?

The 1.0 mm maximum height enables placement under tight mechanical shields and in stacked-flex assemblies common in smartphones. Thermally, its low profile reduces standoff distance to heatsink planes, but the 20 °C/W R_th(j-l) relies on recommended pad layout (FR4, 1 cm² copper per lead); insufficient copper area increases junction temperature during surge events beyond rated limits.

Is SMTYF5.0A compliant with AEC-Q200 for automotive use?

No - SMTYF5.0A is not AEC-Q200 qualified. While its operating junction temperature range (–40 °C to +175 °C) meets automotive ambient extremes, ST does not list it in AEC-Q200 stress-tested categories. For automotive infotainment or telematics I/O protection, ST recommends Q-grade alternatives such as SMAJ5.0A-Q or designated automotive Transky variants with full qualification documentation.