STMicroelectronics STPS5L40RL

Overview

STPS5L40RL 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. It delivers 0.44 V typical forward voltage at 5 A and 25°C, exhibits 10,000 V/µs dV/dt rating, and supports 150 A non-repetitive surge current - enabling high-efficiency battery chargers and consumer SMPS for DVD players and set-top boxes.

For engineers reviewing the STPS5L40RL datasheet, STPS5L40RL pinout, STPS5L40RL application, or STPS5L40RL equivalent, key selection criteria include its low thermal resistance (15 °C/W junction-to-leads), avalanche-rated capability (2700 W peak), and validated performance across −65 to +150°C operating range - critical for compact, thermally constrained 5–12 V DC-DC outputs.

Technical Context

This Schottky rectifier uses a planar metal-silicon junction with negligible minority-carrier storage, eliminating reverse recovery time and associated switching losses. Its low forward voltage drop stems from optimized barrier height and epitaxial layer design, directly reducing conduction loss in high-frequency (≥100 kHz) topologies.

The device features specified avalanche energy handling (2700 W at 1 µs, 25°C), enabling robustness against transient overvoltage events without external snubbers. Thermal design is supported by dual-path dissipation: 15 °C/W to leads (10 mm length) and 75 °C/W to ambient on FR4 PCB - allowing flexible heatsinking via lead soldering or copper pour.

Key Specifications

Pinout & Package

DO-201AD axial package with cathode indicated by white band; leads are unmarked anode/cathode terminals. Mechanical dimensions: body length 25.4 mm, diameter 5.3 mm, lead diameter 1.3 mm, minimum right-angle bend zone 15 mm.

Key Features

Applications

Availability

STPS5L40RL is available at Aetrix Electronics and suitable for battery chargers, DVD player power supplies, set-top box SMPS, and USB-C PD auxiliary rails requiring stable component supply with traceable lot history and long-term continuity.

Supply support for STPS5L40RL 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency, low-voltage power conversion - specifically engineered for Schottky rectification in cost-sensitive, space-constrained SMPS where thermal performance and surge robustness are critical.

FAQ

What is the cathode identification method for STPS5L40RL?

The cathode is marked by a single white band on the DO-201AD body, adjacent to the cathode lead. This marking is visible before and after PCB assembly and aligns with JEDEC DO-201AD mechanical standards. No silkscreen or PCB footprint polarity indicator substitutes for this physical band during manual inspection or automated optical verification.

Can STPS5L40RL replace a standard PN rectifier in an existing 40 V design?

Yes - it can directly replace PN rectifiers like 1N5408 in 40 V-rated designs, provided layout accommodates axial DO-201AD form factor and thermal relief pads are sized for 15 °C/W lead conduction. Forward voltage reduction lowers conduction loss, but note: no reverse recovery means reduced EMI filtering burden, not increased switching speed dependency.

Is STPS5L40RL suitable for synchronous rectification topologies?

No - it is a passive Schottky diode, not a synchronous rectifier IC. It serves as a self-commutated freewheeling element in flyback, forward, or LLC converters where gate drive complexity is undesirable. For true synchronous rectification, discrete MOSFETs or dedicated SR controllers (e.g., STSR3) are required.

What is the maximum recommended PCB copper area for thermal enhancement?

Per Figure 10 in the datasheet, 70 cm² of 35 µm Cu on FR4 reduces R_th(j-a) from 75 °C/W to ~25 °C/W. For most applications, 10–20 cm² per lead (total 20–40 cm²) achieves optimal balance between thermal gain and board area - verified by thermal imaging at 5 A continuous load with 10 mm lead length.