STMicroelectronics STPS20L45CG-TR

Overview

STPS20L45CG-TR from STMicroelectronics is a dual-center-tap 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 drop of 0.44 V at 10 A and 125 °C. It delivers low conduction and switching losses for high-frequency DC–DC converters and SMPS output rectification.

For engineers reviewing the STPS20L45CG-TR datasheet, STPS20L45CG-TR pinout, STPS20L45CG-TR application, or STPS20L45CG-TR equivalent, key selection criteria include its insulated thermal performance (Rth(j-c) = 1.3 °C/W total), avalanche-rated 285 W peak power, and ECOPACK®2-compliant D²PAK footprint optimized for automated SMT assembly and thermal management in compact power stages.

Technical Context

This dual Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification or dual-output DC–DC topologies. Its low VF (0.44 V typ. @ 10 A, 125 °C) and fast recovery minimize conduction loss and EMI generation in 100 kHz–1 MHz switching applications.

The D²PAK package provides enhanced thermal coupling to PCB copper (Rth(j-a) ≈ 15 °C/W on 100 cm² FR4), while its 2000 VRMS insulation rating (per TO-220FPAB variant) confirms isolation capability - though the D²PAK variant relies on board-level creepage/clearance for system-level isolation compliance.

Key Specifications

Pinout & Package

STPS20L45CG-TR uses the surface-mount D²PAK (TO-263) package with three terminals: two anodes (A1, A2) and one shared cathode (K). The package features a large exposed copper tab for thermal dissipation and mechanical anchoring to PCB copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS20L45CT and STPS20L45CFP, the STPS20L45CG-TR offers optimal SMT manufacturability and thermal performance for high-volume DC–DC designs, trading off isolation capability for lower profile and superior PCB thermal coupling - making it ideal for space-constrained, thermally aggressive applications like server VRMs and telecom power modules.

Availability

STPS20L45CG-TR is available at Aetrix Electronics and suitable for server VRM output rectification, industrial DC–DC converters, and telecom power supplies requiring stable component supply, high-reliability SMT assembly, and consistent thermal performance across production lots.

Supply support for STPS20L45CG-TR 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.

The STPS20L45C series belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-voltage power conversion where minimal conduction loss and robust avalanche behavior are critical - targeting next-generation SMPS, VRMs, and isolated DC–DC modules.

FAQ

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

The datasheet specifies that a 100 cm² copper surface under the D²PAK tab yields Rth(j-a) ≈ 15 °C/W. For best results, use ≥200 cm² of 2-oz copper connected via ≥8 thermal vias (0.3 mm diameter, spaced ≤2 mm apart) to inner ground/power planes. This configuration sustains 20 A total current at ≤105 °C case temperature in still air.

Does STPS20L45CG-TR support synchronous rectification drive schemes?

No - STPS20L45CG-TR is a passive Schottky diode, not a controlled switch. It operates unidirectionally with fixed forward voltage drop and cannot be actively gated. For synchronous rectification, discrete MOSFETs or dedicated SR controllers (e.g., STSR3) must be used in conjunction with this device as a reference or fallback path.

Is the D²PAK package of STPS20L45CG-TR electrically insulated?

No - unlike the TO-220FPAB variant, the D²PAK package has no internal insulation barrier. The metal tab is electrically connected to the cathode (K) terminal. System-level isolation must be achieved via PCB layout (creepage/clearance) and transformer design, not package insulation.

How does the dual-center-tap configuration affect PCB layout compared to two discrete Schottky diodes?

The integrated A1–K–A2 structure reduces component count by one, eliminates interconnect inductance between separate diodes, and ensures matched thermal and electrical characteristics. Layout requires only three pads (A1, A2, K) with symmetric copper pours - simplifying routing and improving current sharing versus discrete placement with unequal trace lengths.