STMicroelectronics STPS20L45CG

Overview

STPS20L45CG from STMicroelectronics is a dual-center-tap low-drop Schottky rectifier in D²PAK package, rated for 45 V repetitive peak reverse voltage and 2 × 10 A average forward current per diode at TC = 135 °C, with typical forward voltage of 0.44 V at 10 A and 125 °C - optimized for high-frequency DC-DC converters and synchronous rectification in low-voltage power supplies.

For engineers reviewing the STPS20L45CG datasheet, STPS20L45CG pinout, STPS20L45CG application, or STPS20L45CG equivalent, key selection criteria include its insulated thermal performance (Rth(j-c) = 1.3 °C/W total), avalanche-rated capability (285 W peak), ECOPACK®2 compliance, and dual-diode center-tap configuration enabling compact flyback and half-bridge freewheeling designs.

Technical Context

This dual Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap topology), supporting bidirectional current routing in synchronous rectifier stages and polarity protection circuits. Its low VF (0.44 V typ. @ 10 A, 125 °C) and low switching losses enable operation up to several hundred kHz without significant conduction or recovery loss penalties.

The D²PAK package provides enhanced thermal coupling (Rth(j-c) = 1.3 °C/W total) and 2000 VRMS insulation rating, while avalanche energy handling (PARM = 285 W, tp = 10 µs) ensures robustness against transient overvoltage events in unregulated or loosely regulated DC bus environments.

Key Specifications

Pinout & Package

The STPS20L45CG uses the surface-mount D²PAK (TO-263) package with three terminals: two anodes (A1, A2) and one common cathode (K). The package features isolated mounting tab (2000 VRMS insulation), gull-wing leads, and thermally enhanced copper die pad for PCB heat spreading.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS20L45CT and VS-20CPH04-M3, the STPS20L45CG delivers superior power density via D²PAK's lower thermal resistance (1.3 °C/W vs. 2.0 °C/W), integrated center-tap topology eliminating external wiring, and guaranteed avalanche capability critical for unregulated input stages.

Availability

STPS20L45CG is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, and automotive infotainment power supplies requiring stable component supply, high-reliability Schottky rectification, and RoHS-compliant packaging.

Supply support for STPS20L45CG 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 industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion, with the STPS20L45CG specifically engineered for low-voltage, high-current synchronous rectification in space-constrained, thermally demanding applications.

FAQ

What is the maximum recommended PCB copper area for optimal thermal performance of STPS20L45CG?

The datasheet specifies that a 100 cm² copper surface under the D²PAK tab achieves Rth(j-a) ≈ 15 °C/W. For 20 A continuous operation, ST recommends ≥200 cm² of 35 µm-thick FR4 copper (two internal layers + top/bottom) with thermal vias to inner planes to maintain Tj ≤ 135 °C at 70 °C ambient.

Does STPS20L45CG support paralleling of A1 and A2 terminals for single-path 20 A operation?

No - A1 and A2 are electrically isolated anodes sharing only the common cathode K. Paralleling them would short the internal die structure. Each anode must be driven independently; simultaneous conduction is permitted only when both are forward-biased relative to K, as in center-tap transformer configurations.

Is the 2000 VRMS insulation rating applicable to all D²PAK variants of this part number?

Yes - the 2000 VRMS isolation is inherent to the D²PAK mold compound and internal dielectric construction, verified per IEC 60747-5-2. This rating applies to STPS20L45CG regardless of reel quantity or date code, and is maintained across full temperature range (–65 °C to +150 °C).

How does the 285 W avalanche rating translate to real-world transient protection capability?

The 285 W rating (at tp = 10 µs, Tj = 125 °C) corresponds to 2.85 mJ of single-pulse avalanche energy. In practice, this allows the device to safely absorb 100 V × 28.5 A × 10 µs transients - sufficient for most transformer leakage inductance spikes in 24–48 V input flyback or forward converters without external clamping.