STMicroelectronics STPS10L40CSF

Overview

STPS10L40CSF from STMicroelectronics is a dual 5 A, 40 V Schottky rectifier in PSMC (TO-277A) package, designed for high-efficiency oring, polarity protection, and standby power circuits. It delivers typ. 0.370 V forward voltage at 5 A and 125 °C, supports 120 A non-repetitive surge current, and operates up to 150 °C junction temperature - enabling compact DC/DC converters in telecom and server auxiliary supplies.

For engineers reviewing the STPS10L40CSF datasheet, STPS10L40CSF pinout, STPS10L40CSF application, or STPS10L40CSF equivalent, key selection criteria include low conduction loss (VF = 0.370 V @ 5 A, 125 °C), wettable flanks for automated optical inspection, dual-diode configuration for redundancy or reverse-polarity blocking, and ECOPACK2-compliant packaging for environmental compliance.

Technical Context

This dual Schottky diode integrates two independent 40 V, 5 A rated diodes in a single PSMC (TO-277A) surface-mount package with shared cathode connection. Its low VF and high IFSM (120 A) support robust transient handling in oring applications where back-to-back diode configurations prevent reverse current flow during hot-swap events.

The device uses planar Schottky barrier technology optimized for minimal reverse recovery charge (Qrr ≈ 0 nC) and low junction capacitance (typ. 400 pF @ 4 V), reducing switching losses and EMI in high-frequency SMPS designs operating up to several hundred kHz.

Key Specifications

Pinout & Package

STPS10L40CSF is housed in a PSMC (TO-277A) surface-mount package: 6.5 mm × 4.6 mm × 1.1 mm (typ.), with wettable flanks and exposed cathode pad for enhanced thermal conduction and AOI compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-10CTH04-M3 and MBR1045CT, STPS10L40CSF offers superior thermal performance (1.0 °C/W vs. ≥2.5 °C/W), lower VF at operating temperature, and surface-mount compatibility with automated inspection - making it optimal for space-constrained, high-reliability telecom and server applications.

Availability

STPS10L40CSF is available at Aetrix Electronics and suitable for server oring, telecom standby power, and industrial DC/DC converter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STPS10L40CSF 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

STPS10L40CSF belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for low-VF, high-surge, surface-mount power conversion in telecom infrastructure, data center power supplies, and industrial SMPS.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The STPS10L40CSF has a maximum junction temperature of +150 °C. This rating allows operation in thermally demanding environments such as enclosed telecom chassis. With Rth(j-c) = 1.0 °C/W, a 2 W power dissipation yields only a 2 °C rise above case temperature - meaning effective thermal design relies on maximizing copper area under the cathode pad rather than adding heatsinks.

Is STPS10L40CSF suitable for reverse polarity protection in 24 V systems?

Yes. With VRRM = 40 V and IF(AV) = 5 A per diode, STPS10L40CSF provides sufficient voltage margin and current capacity for 24 V nominal systems. Its low VF minimizes voltage drop across the protection path, preserving system efficiency and ensuring reliable operation even at elevated ambient temperatures up to 85 °C.

Does this device require a gate driver or control signal?

No. STPS10L40CSF is a passive Schottky rectifier with no control pins or gate terminals. It conducts when forward-biased and blocks when reverse-biased - making it ideal for simple, robust oring and polarity protection functions without supporting circuitry or timing constraints.

How does the wettable flank feature improve manufacturing yield?

The wettable flanks on the PSMC (TO-277A) package provide visible, measurable solder fillets along the side walls after reflow. This enables automated optical inspection (AOI) systems to verify solder joint quality without requiring X-ray analysis - reducing test cost, increasing throughput, and improving first-pass yield in high-volume server and telecom board assembly.