STMicroelectronics STPS20120CTN

Overview

STPS20120CTN from STMicroelectronics is a dual common-cathode Schottky rectifier in TO-220AB narrow leads package, rated for 120 V repetitive peak reverse voltage and 20 A average forward current per device at Tc = 145 °C. It delivers low forward voltage drop (0.70 V typ. at 2.5 A, 25 °C) and low leakage current (1.5 mA max. at 125 °C, VR = 120 V), enabling high-efficiency secondary-side rectification in notebook/LCD power adapters.

For engineers reviewing the STPS20120CTN datasheet, STPS20120CTN pinout, STPS20120CTN application, or STPS20120CTN equivalent, key selection criteria include thermal resistance (Rth(j–c) = 1.8 °C/W total), avalanche capability (330 W, tp = 10 µs), junction temperature rating (175 °C), and ECOPACK®2 compliance - all critical for compact, thermally constrained SMPS designs.

Technical Context

This dual-diode Schottky rectifier integrates two independent anodes sharing a common cathode terminal, optimized for synchronous or independent operation in high-frequency DC–DC outputs. Its design emphasizes conduction loss minimization via low VF and thermal stability through low Rth(j–c) and high Tj(max).

Each diode supports 10 A average forward current at Tc = 150 °C, with surge capability up to 150 A (10 ms sinusoidal). Avalanche energy handling is specified under controlled pulse conditions (tp = 10 µs, Tj = 125 °C), confirming robustness against transient overvoltage events in unregulated or lightly loaded supplies.

Key Specifications

Pinout & Package

Package: TO-220AB narrow leads - thermally enhanced plastic case with insulated tab, compatible with standard TO-220 footprints but featuring narrower lead spacing (e1 = 4.95–5.15 mm) for improved creepage/clearance in high-voltage secondary circuits.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH12-M3 and MUR20120CT, STPS20120CTN offers superior thermal performance (1.8 °C/W vs. 2.0 °C/W), lower VF, and guaranteed avalanche capability - making it optimal for compact, high-frequency, thermally constrained SMPS where reliability and efficiency are co-prioritized.

Availability

STPS20120CTN is available at Aetrix Electronics and suitable for notebook power adapters, LCD monitor SMPS, desktop ATX secondary rectification, and USB-C PD fast-charging adapters requiring stable component supply and long-term industrial availability.

Supply support for STPS20120CTN 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 automotive, industrial, and consumer markets.

The STPS20120C series belongs to ST's high-performance Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact AC–DC and DC–DC power supplies.

FAQ

Is STPS20120CTN pin-compatible with standard TO-220AB packages?

No - STPS20120CTN uses the TO-220AB narrow leads variant, with e1 = 4.95–5.15 mm (vs. 5.5–5.7 mm for standard TO-220AB). This reduces lead pitch to improve creepage distance in high-voltage secondary circuits but requires matching footprint design.

What is the maximum recommended mounting torque for the STPS20120CTN tab?

The maximum torque value for STPS20120CTN's mounting screw is 0.7 N·m. ST specifies a recommended torque of 0.55 N·m to ensure reliable thermal contact without damaging the internal die attach or package integrity during heatsink installation.

Does STPS20120CTN require a heatsink in typical 20 A adapter applications?

Yes - although rated for 20 A at Tc = 145 °C, sustained operation at full current requires thermal coupling of the cathode tab to ≥10 cm² of 2 oz copper on inner PCB layers or an external aluminum heatsink. Without thermal management, junction temperature exceeds 175 °C within seconds under full load.

How does the avalanche rating of STPS20120CTN impact circuit protection design?

The 330 W repetitive avalanche power rating (tp = 10 µs, Tj = 125 °C) allows STPS20120CTN to absorb transient energy from transformer leakage inductance without external snubbers. This simplifies layout, reduces component count, and improves reliability in quasi-resonant and LLC converter topologies where voltage spikes exceed VRRM momentarily.