STMicroelectronics STPS40SM80CG-TR

Overview

STPS40SM80CG-TR from STMicroelectronics is a dual common-cathode Schottky rectifier in D2PAK surface-mount package, rated for 80 V repetitive peak reverse voltage and 2 × 20 A average forward current per diode at T_c = 145 °C. It delivers low forward voltage drop (0.520–0.690 V at 125 °C, 20 A) and low leakage current (≤30 mA at 125 °C, 80 V), optimized for high-frequency SMPS in compact AC/DC adapters.

For engineers reviewing the STPS40SM80CG-TR datasheet, STPS40SM80CG-TR pinout, STPS40SM80CG-TR application, or STPS40SM80CG-TR equivalent, key selection criteria include thermal resistance (R_th(j-c) = 0.88 °C/W total), avalanche capability (V_ARM = 100 V, t_p < 1 µs), insulated package suitability, and D2PAK footprint compatibility with automated SMT assembly.

Technical Context

This dual Schottky rectifier integrates two independent anodes sharing a common cathode terminal, enabling synchronous or interleaved conduction paths in center-tapped or dual-output topologies. Its junction-to-case thermal resistance of 0.88 °C/W (total) supports high-power density designs when mounted on copper pads per Figure 14.

The device features specified avalanche energy handling (P_ARM = 9500 W, t_p = 1 µs) and low junction capacitance (≈100 pF at 30 mV, 1 MHz), critical for minimizing switching losses and EMI in >100 kHz DC-DC converters used in notebook and LCD TV power supplies.

Key Specifications

Pinout & Package

STPS40SM80CG-TR uses a 3-pin D2PAK (TO-263) surface-mount package with exposed metal tab for thermal and electrical connection. The tab is electrically connected to the common cathode (K), while pins A1 and A2 are isolated anodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH08-M3 and MBR4080CT, STPS40SM80CG-TR uniquely combines D2PAK SMT compatibility, 0.88 °C/W total thermal resistance, and 100 V avalanche clamping-enabling smaller, cooler, and more robust adapter designs without discrete protection.

Availability

STPS40SM80CG-TR is available at Aetrix Electronics and suitable for notebook AC/DC adapters, LCD TV power supplies, and game console power modules requiring stable component supply, high-volume tape-and-reel delivery, and long-term industrial lifecycle support.

Supply support for STPS40SM80CG-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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

This device belongs to ST's high-efficiency power rectifier product line, engineered specifically for high-frequency switch-mode power supplies where low forward voltage, thermal performance, and reliability under transient stress are critical.

FAQ

What is the maximum junction temperature and how is it enforced?

The absolute maximum junction temperature is 175 °C, defined to prevent thermal runaway in standalone operation. This limit is enforced via thermal design: with R_th(j-c) = 0.88 °C/W and typical PCB copper area, junction temperature remains below 150 °C at 40 A total conduction under 50 °C ambient, verified using the thermal model in Figure 14.

Does the D2PAK package provide electrical isolation between anodes and cathode?

No-the D2PAK package is non-insulated; the metal tab is electrically connected to the common cathode (K). Anodes A1 and A2 are isolated from the tab and each other. For insulated applications, ST offers the TO-220FPAB variant (STPS40SM80CFP) with 2000 V isolation rating.

How does the avalanche capability affect circuit protection design?

The device is tested and rated for 100 V repetitive avalanche voltage (V_ARM) at t_p < 1 µs, allowing it to safely clamp inductive switching spikes without external TVS diodes. This eliminates snubber networks in flyback and LLC converters, reducing component count and board space while maintaining reliability.

Can STPS40SM80CG-TR replace STPS40SM80CR in I2PAK footprint?

No-STPS40SM80CR uses I2PAK (TO-262) with different pin pitch (2.54 mm) and body dimensions, while STPS40SM80CG-TR uses D2PAK (TO-263) with 2.54 mm pin pitch but longer body and larger tab. Direct replacement requires PCB redesign; thermal performance also differs (R_th(j-c) = 1.2 °C/W for I2PAK vs. 0.88 °C/W for D2PAK).