STMicroelectronics STPS30L120CT

Overview

STPS30L120CT from STMicroelectronics is a dual center-tap Schottky rectifier in TO-220AB package, rated for 120 V repetitive peak reverse voltage and 2 × 15 A average forward current per diode, with typical forward voltage drop of 0.65 V at 125 °C and 15 A. It delivers low conduction loss and high-frequency switching performance for DC/DC converters and notebook adapters.

For engineers reviewing the STPS30L120CT datasheet, STPS30L120CT pinout, STPS30L120CT application, or STPS30L120CT equivalent, key selection criteria include junction-to-case thermal resistance (0.7 °C/W total), avalanche power rating (828 W), insulated package option (TO-220FPAB variant), and ECOPACK®2 compliance for environmental design requirements.

Technical Context

This dual-diode Schottky rectifier integrates two anti-parallel anodes sharing a common cathode terminal, enabling center-tap transformer secondary rectification in full-wave configurations. Its low VF and fast recovery support high-efficiency, high-frequency SMPS topologies up to several hundred kHz.

Thermal management is defined by junction-to-case resistance (0.7 °C/W total for TO-220AB), with derating curves confirming stable operation up to 150 °C junction temperature. Avalanche capability is specified at 828 W for 10 µs pulses, enabling robust surge handling without external clamping.

Key Specifications

Pinout & Package

Package: TO-220AB - Insulated metal tab, single-row 3-pin through-hole package with mechanical dimensions per DS6493 Table 4 (A = 4.5 mm, D = 15.5 mm, L = 13.5 mm). Mounting torque: 0.55 N·m recommended.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH12 and MBR30H120CT, STPS30L120CT offers the lowest V_F and best thermal resistance among 120 V dual Schottkys, making it optimal for high-efficiency, space-constrained 19–24 V adapter and server power designs where thermal headroom is critical.

Availability

STPS30L120CT is available at Aetrix Electronics and suitable for notebook AC adapters, server DC/DC converters, industrial power modules, and LED driver power stages requiring stable component supply and consistent thermal performance across production volumes.

Supply support for STPS30L120CT 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 automotive, industrial, and consumer markets.

The STPS30L120CT belongs to ST's high-performance Schottky rectifier product line, engineered specifically for high-frequency, high-efficiency switch-mode power supplies where low forward voltage and thermal robustness are critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS30L120CT has a maximum junction temperature of 150 °C. With a total junction-to-case thermal resistance of 0.7 °C/W and typical power dissipation of 2.1 W at 15 A/125 °C, the case temperature must remain below 148.5 °C to avoid exceeding T_j(max). Derating is required above 100 °C ambient in natural convection setups.

Is the metal tab electrically connected to any pin?

Yes - in the TO-220AB package, the metal tab is internally connected to the cathode (Pin 2). This provides low-inductance return path and simplifies heatsinking, but requires electrical isolation from chassis if the cathode is not at ground potential.

Can STPS30L120CT be used in non-center-tap topologies?

No - its internal structure consists of two anodes sharing a common cathode; it is not configurable as independent diodes. For non-center-tap applications like full-bridge or dual-output designs, discrete single-die Schottkys such as STPS30L120S must be used instead.

Does this part require a minimum load or snubber circuit?

No snubber is required due to the absence of reverse recovery charge. However, a small RC snubber (e.g., 100 Ω + 100 pF) across each anode-to-cathode may be added to suppress high-frequency ringing in layouts with long transformer secondary traces and fast-switching MOSFETs.