STMicroelectronics STPS5L40

Overview

STPS5L40 from STMicroelectronics is a 40 V, 5 A average forward current axial Schottky rectifier in DO-201AD package, optimized for low-voltage output stages in switch-mode power supplies and high-frequency inverters used in DVD players and set-top boxes. It delivers negligible switching losses, 0.44 V max forward voltage at 5 A and 25°C, 150°C max junction temperature, and avalanche-rated 2700 W peak power.

For engineers reviewing the STPS5L40 datasheet, STPS5L40 pinout, STPS5L40 application, or STPS5L40 equivalent, key selection criteria include its low thermal resistance (15 °C/W junction-to-leads), 10,000 V/µs dV/dt rating, 15 A RMS forward current capability, and cathode-indicated axial lead configuration for reliable low-loss DC rectification in compact consumer SMPS designs.

Technical Context

This Schottky diode operates as a unidirectional, low-loss power rectifier with metal–semiconductor junction architecture enabling near-zero reverse recovery charge and no minority-carrier storage delay. Its 40 V repetitive peak reverse voltage and 150 A non-repetitive surge current support transient-heavy operation in 5–12 V output converters.

Thermal design is enabled by dual-path heat dissipation: 15 °C/W junction-to-leads (10 mm lead length) and 75 °C/W junction-to-ambient on FR4 board, with derating curves provided for ambient temperatures up to 125°C and pulse duty cycles from δ = 0.05 to 1.0.

Key Specifications

Pinout & Package

DO-201AD axial plastic package with white band indicating cathode terminal. Leads are tinned copper, 1.30 mm diameter, with 25.4 mm overall length and 9.5 mm body length. Mounting requires axial lead bending within 15 mm of body per mechanical note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR540G and SB540, STPS5L40 offers the lowest VF and best thermal resistance among DO-201AD 40 V Schottkys, making it optimal for thermally dense consumer SMPS where efficiency and board-level thermal management are prioritized.

Availability

STPS5L40 is available at Aetrix Electronics and suitable for DVD player power supplies, set-top box SMPS, and small battery charger designs requiring stable component supply, long-term manufacturability, and UL94-compliant packaging.

Supply support for STPS5L40 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency, low-voltage power conversion with Schottky rectifiers optimized for cost-sensitive, high-volume consumer power supplies and portable electronics.

FAQ

What is the cathode identification method for STPS5L40?

The STPS5L40 uses a white band painted on the DO-201AD epoxy body to indicate the cathode terminal. The unmarked lead is the anode. This marking complies with JEDEC standards and is visible after board mounting, enabling reliable polarity verification during assembly and rework.

Can STPS5L40 replace a standard PN junction rectifier in an existing 5 V SMPS?

Yes - STPS5L40 can directly replace a 1N5822 or similar 3 A/40 V Schottky in most 5 V outputs, provided layout accommodates its 5 A IF(AV) rating and axial lead spacing. Its lower VF reduces conduction loss by ~35%, lowering MOSFET stress and improving thermal margin without circuit modification.

Is STPS5L40 suitable for use without a heatsink?

Yes, when mounted with ≥10 mm straight leads on FR4 PCB and delivering ≤3 A average current at Tamb ≤ 60°C. Its 15 °C/W Rth(j-l) enables sufficient self-cooling; however, above 3 A or in sealed enclosures, supplemental copper pour or forced air is recommended per Fig. 2 derating curve.

Does STPS5L40 meet RoHS and REACH compliance?

Yes - STPS5L40 manufactured after 2006 conforms to EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead-free solderability is guaranteed per J-STD-020, and material declarations are available via STMicroelectronics' official product change notifications.