STMicroelectronics STPS1545CR

Overview

STPS1545CR from STMicroelectronics is a dual center-tap Schottky rectifier in I²PAK package, rated for 45 V reverse voltage and 2 × 7.5 A average forward current per diode, with typical forward voltage of 0.5 V at 7.5 A and 125 °C junction temperature. It delivers negligible switching losses and avalanche capability up to 190 W (10 µs pulse), targeting high-frequency DC-DC converters and low-voltage inverters.

For engineers reviewing the STPS1545CR datasheet, STPS1545CR pinout, STPS1545CR application, or STPS1545CR equivalent, key selection criteria include its dual-diode configuration, thermal resistance (R_th(j-c) = 3.0 °C/W per diode), ECOPACK®2 compliance, and suitability for free-wheeling and polarity protection where fast recovery and low conduction loss are critical.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode (center-tap configuration), enabling synchronous rectification or dual-path freewheeling in half-bridge topologies. Its ultra-low VF and absence of minority-carrier storage eliminate reverse recovery charge, making it ideal for >100 kHz switching applications.

Thermal design relies on case-to-heatsink conduction: R_th(j-c) is 3.0 °C/W per diode, but coupling between diodes adds 0.35 °C/W when both operate simultaneously. Maximum junction temperature is 175 °C, supported by TO-220AB, I²PAK, and D²PAK variants - STPS1545CR specifically uses the surface-mount I²PAK variant requiring through-hole mounting per ST's directive.

Key Specifications

Pinout & Package

The STPS1545CR is housed in an I²PAK (TO-263) package with three terminals: two anodes (A1, A2) and one shared cathode (K). The metal slug serves as the thermal path and must be soldered via through-hole mounting - surface-mounting the slug is prohibited per ST specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS1545CT and STPS15H100CG-TR, the STPS1545CR offers optimal balance of low VF, compact I²PAK footprint, and 45 V rating for cost-sensitive, high-frequency 24–42 V DC-DC applications - whereas CT prioritizes ruggedness and CG-TR trades VF for voltage headroom.

Availability

STPS1545CR is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, solar microinverters, and automotive polarity protection circuits requiring stable component supply and long-term production continuity.

Supply support for STPS1545CR 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 Schottky technology optimized for low-VF, high-reliability rectification in SMPS, inverters, and protection circuits - emphasizing thermal robustness and avalanche survivability.

FAQ

Is STPS1545CR suitable for surface-mount assembly?

No - although the I²PAK package appears surface-mountable, ST explicitly prohibits soldering the metal slug as a surface-mount component. Through-hole mounting is mandatory to ensure mechanical integrity and thermal performance. The leads must be inserted into plated-through holes and soldered on the opposite side, with the slug contacting an internal copper pour or external heatsink.

What is the maximum continuous power dissipation per diode at 100 °C ambient?

Using R_th(j-c) = 3.0 °C/W and T_j(max) = 175 °C, the allowable ΔT is 75 °C. With case-to-ambient thermal resistance dependent on PCB copper area, typical dissipation is ≤25 W per diode when mounted on ≥10 cm² of 2-oz copper. Derating curves in Figure 2 confirm 7.5 A average current is sustainable at 100 °C ambient with adequate heatsinking.

Can STPS1545CR replace two separate 7.5 A Schottky diodes?

Yes - its dual center-tap configuration replaces two discrete diodes in topologies requiring shared cathode routing, such as center-tapped transformer outputs or dual-rail freewheeling. However, it cannot substitute for anode-common or cathode-isolated configurations. Pin compatibility and thermal coupling effects must be validated in the target layout.

Does STPS1545CR require a heatsink in a 5 A, 24 V DC-DC application?

At 5 A, conduction loss is ~2.5 W per diode (0.5 V × 5 A). With R_th(j-c) = 3.0 °C/W, junction rise is ~7.5 °C above case temperature. If the PCB provides R_th(c-a) ≤ 20 °C/W, total rise is <160 °C - acceptable below 175 °C. A dedicated heatsink is optional but recommended for reliability in enclosed or high-ambient environments.