STMicroelectronics STPS40M80CT

Overview

STPS40M80CT from STMicroelectronics is a dual common-cathode Schottky rectifier in TO-220AB package, rated for 80 V repetitive peak reverse voltage and 2 × 20 A average forward current per diode at Tc = 150 °C, with typical forward voltage of 475 mV at 10 A and 125 °C - optimized for high-efficiency AC/DC adapters in notebook and LCD TV power supplies.

For engineers reviewing the STPS40M80CT datasheet, STPS40M80CT pinout, STPS40M80CT application, or STPS40M80CT equivalent, key selection criteria include junction-to-case thermal resistance (1.30 °C/W per diode), avalanche capability (100 V, 1 µs pulse), low leakage (≤40 mA at 125 °C, VR = VRRM), and dual-diode thermal coupling behavior in high-density SMPS designs.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode terminal, enabling synchronous or interleaved rectification topologies. Its silicon design emphasizes low VF–IR trade-off, with VF typ. 0.475 V at 10 A/125 °C and IR max. 40 mA under same conditions - critical for maintaining efficiency across light-to-heavy load transitions.

The TO-220AB package provides direct metal tab thermal conduction to heatsinks, supporting 175 °C maximum junction temperature and specified avalanche energy handling (10,000 W peak, tp = 1 µs). Thermal coupling between diodes is quantified via Rth(c) = 0.20 °C/W, enabling accurate multi-diode loss modeling in shared thermal environments.

Key Specifications

Pinout & Package

TO-220AB package with isolated metal tab (electrically connected to cathode), 3-pin configuration: Pin 1 = Anode 1, Pin 2 = Cathode (common), Pin 3 = Anode 2. Mounting torque: 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPQ080PbF and MBR4080CT, STPS40M80CT delivers lower VF (−0.105 V), superior thermal resistance (−0.2 °C/W), and guaranteed avalanche performance - making it optimal for thermally aggressive, high-reliability AC/DC adapters where efficiency and transient robustness are co-prioritized.

Availability

STPS40M80CT is available at Aetrix Electronics and suitable for notebook AC adapters, LCD TV power supplies, and game console external PSUs requiring stable component supply, long-lifecycle support, and consistent thermal performance across production batches.

Supply support for STPS40M80CT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS40M80CT specifically engineered for dual-channel Schottky rectification in compact, high-frequency SMPS used in portable and display electronics.

FAQ

What is the maximum continuous current per diode at 100 °C case temperature?

At Tc = 100 °C, the STPS40M80CT supports 2 × 26 A average forward current per diode (derated from 20 A at 150 °C using Figure 3). This is calculated from the linear derating curve: IF(AV) = 20 A × (175 − 100)/(175 − 150) = 26 A, confirmed by ST's published thermal data.

Is the metal tab electrically isolated from the leads?

No - the metal tab is internally connected to the common cathode (Pin 2) and must be electrically insulated from the heatsink unless the cathode node is at chassis ground potential. ST specifies this in Package Information section: "Cooling method: by conduction (C)" with tab-to-cathode continuity.

Does STPS40M80CT support parallel operation of both diodes for single-output high-current applications?

Yes - the device is explicitly characterized for simultaneous conduction: Table 2 lists "Per device" IF(AV) = 40 A, and thermal modeling in Section 2 accounts for mutual heating (ΔTj(diode 1) includes P(diode 2) × Rth(c)). Parallel use is valid if total power dissipation stays within 52 W (2 × 26 W) and heatsink design accommodates coupled thermal resistance.

What is the recommended solder profile for TO-220AB reflow assembly?

ST recommends lead-free reflow per JEDEC J-STD-020D: peak temperature 260 °C for ≤10 seconds, with ramp rate ≤3 °C/s. The epoxy meets UL94 V0, and mechanical integrity is maintained up to 0.6 N·m mounting torque - verified in Package Information section under "Recommended torque value".