STMicroelectronics STPS30L45CT

Overview

STPS30L45CT from STMicroelectronics is a dual-center-tap low-drop Schottky rectifier in TO-220AB package, rated for 45 V repetitive peak reverse voltage, 30 A total average forward current (15 A per diode), and maximum junction temperature of 150 °C. It delivers low forward voltage drop (0.55 V at 15 A, 25 °C) and low thermal resistance (1.60 °C/W junction-to-case per diode), enabling high-efficiency operation in DC–DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS30L45CT datasheet, STPS30L45CT pinout, STPS30L45CT application, or STPS30L45CT equivalent, key selection criteria include avalanche rating (6000 W peak), insulated thermal performance under forced conduction cooling, reverse leakage behavior at 125 °C, and compatibility with center-tapped transformer topologies requiring dual anti-parallel conduction paths.

Technical Context

This dual-diode Schottky rectifier integrates two independent anode-cathode junctions sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification in push-pull and full-bridge DC–DC topologies. Its low dV/dt rating (10,000 V/µs) and avalanche-rated design support robust operation during transient voltage spikes without external snubbers.

The device uses platinum-doped silicon to achieve stable forward voltage across temperature (0.42–0.50 V at 15 A, 125 °C) and low reverse leakage (≤200 mA at 125 °C, VR = 45 V). Thermal coupling between diodes is minimized via shared case geometry with Rth(c) = 0.85 °C/W (total), allowing accurate power dissipation modeling using P = 0.330 × IF(AV) + 0.011 × IF²(RMS).

Key Specifications

Pinout & Package

STPS30L45CT is housed in a TO-220AB package with isolated metal tab (non-insulated), featuring three leads: two anodes (A1, A2) and one common cathode (K). The package provides mechanical robustness and direct thermal path to heatsink via the rear tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH04-M3, STPS30L45CT offers integrated avalanche ruggedness but slightly higher thermal resistance; compared with MBR3045CT, it delivers significantly lower VF and better thermal performance at the expense of tighter layout constraints due to center-tap symmetry requirements.

Availability

STPS30L45CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC–DC converters, solar microinverter auxiliary rails, and automotive on-board charger auxiliary supplies requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for STPS30L45CT 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, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion systems, with STPS30L45CT specifically engineered for low-voltage, high-current, high-frequency rectification in space-constrained and thermally demanding applications.

FAQ

What is the maximum continuous junction temperature for STPS30L45CT?

The absolute maximum operating junction temperature is 150 °C, as specified in Table 2 of the official datasheet (Doc ID 8002 Rev 4). Operation above this limit risks permanent degradation of Schottky barrier integrity and accelerated reverse leakage growth.

Can STPS30L45CT be used in non-center-tapped topologies?

No - STPS30L45CT is internally configured as two anodes sharing a common cathode (A1–K and A2–K), making it unsuitable for single-diode or bridge configurations. Using only one anode de-rates thermal performance and violates the intended dual-path conduction design.

Is the TO-220AB package electrically insulated?

No - unlike the TO-220FPAB variant, the TO-220AB package used in STPS30L45CT has an electrically conductive metal tab directly connected to the cathode (K) terminal. Isolation requires insulating hardware (e.g., mica washer + nylon screw) when mounting to grounded heatsinks.

How does the 6000 W avalanche rating translate to real-world surge handling?

The 6000 W rating applies to a 1 µs pulse at Tj = 25 °C and corresponds to ~6 mJ of single-pulse avalanche energy. In practice, this allows safe clamping of typical flyback or LLC transformer leakage spikes up to 100 V × 60 A for ≤1 µs without parametric shift or failure.