STMicroelectronics STPS140UY

Overview

STPS140UY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SMB (DO-214AA) package, rated for 1 A average forward current, 40 V repetitive peak reverse voltage, and 0.55 V max forward voltage at 1 A and 25 °C. It delivers low conduction losses and negligible switching losses in low-voltage, high-frequency DC/DC converters and polarity protection circuits.

For engineers reviewing the STPS140UY datasheet, STPS140UY pinout, STPS140UY application, or STPS140UY equivalent, key selection criteria include its 0.55 V VF at 1 A/25 °C, 150 °C max junction temperature, 25 °C/W junction-to-lead thermal resistance, avalanche capability (900 W @ 1 µs), and AEC-Q101 qualification for under-hood automotive use.

Technical Context

This single-die Schottky barrier diode operates with zero minority-carrier storage, enabling ultrafast recovery and no reverse recovery charge-critical for high-frequency (>100 kHz) SMPS and synchronous rectification. Its low VF and high surge current rating (60 A IFSM) support compact thermal design in space-constrained automotive modules.

The device features specified avalanche energy handling (900 W @ 1 µs, Tj = 25 °C), validated under unclamped inductive switching conditions, and meets ECOPACK®2 environmental compliance. Thermal performance is defined for SMB mounting on FR4 PCB with 35 µm copper, where Rth(j-a) drops to ~80 °C/W with 1.5 cm² copper per lead.

Key Specifications

Pinout & Package

SMB (JEDEC DO-214AA) surface-mount package with cathode band marking; 3.30–3.95 mm body width, 5.10–5.60 mm length, 1.90–2.45 mm height, and gull-wing leads for reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with NSS1C200MT1G and VS-1EQH04-M3/45, STPS140UY uniquely combines 40 V blocking, 1 A rating, 0.55 V VF, AEC-Q101 qualification, and 900 W avalanche capability in a single SMB footprint-making it optimal for primary-side 12 V automotive power rails requiring robust transient resilience.

Availability

STPS140UY is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC/DC converters, HVAC blower drivers, and ECU power input protection requiring stable component supply and long-term lifecycle assurance.

Supply support for STPS140UY 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STPS automotive Schottky rectifier product line targets high-reliability power conversion in harsh environments, with emphasis on AEC-Q101 qualification, low VF, and avalanche ruggedness for 12 V/42 V vehicle electrical systems.

FAQ

Is STPS140UY suitable for synchronous rectification in a 500 kHz buck converter?

Yes. With zero reverse recovery charge and 10,000 V/µs dV/dt immunity, STPS140UY operates reliably at 500 kHz without ringing or shoot-through risk. Its 0.55 V VF at 1 A minimizes conduction loss versus silicon alternatives, and SMB thermal resistance (25 °C/W j-l) supports efficient heat transfer to PCB copper in high-density layouts.

What is the maximum allowable PCB copper area for thermal optimization in SMB footprint?

Per Figure 13, Rth(j-a) improves from ~120 °C/W (no copper) to ~80 °C/W with 1.5 cm² copper per lead on FR4. Increasing beyond 1.5 cm² yields diminishing returns; recommended layout uses ≥1.5 cm² per pad with 35 µm copper thickness and thermal vias to inner ground planes for best thermal performance.

Does STPS140UY require a heatsink in automotive under-hood applications?

No external heatsink is required. At 1 A IF(AV) and 135 °C lead temperature, self-heating remains within limits using standard SMB PCB mounting. With Rth(j-l) = 25 °C/W and typical ambient + junction rise <115 °C, junction temperature stays below 150 °C even at 85 °C ambient-provided minimum copper area (1.5 cm²/lead) is maintained.

How does the 900 W avalanche rating translate to real-world circuit protection?

The 900 W rating (at 1 µs pulse, Tj = 25 °C) corresponds to 900 mJ energy absorption. In practice, this allows safe clamping of inductive spikes up to 40 V × 22.5 A for 1 µs-sufficient for relay coil de-energization and solenoid driver flyback in BCM and lighting modules without external TVS diodes.