STMicroelectronics STPS40170CGY-TR

Overview

STPS40170CGY-TR from STMicroelectronics is an automotive-grade dual-center-tab Schottky rectifier in D2PAK package, rated for 170 V repetitive peak reverse voltage, 2 × 20 A average forward current per diode, and 175 °C maximum junction temperature. It delivers low forward voltage drop (0.75 V max at 20 A, 125 °C) and low leakage current (30 µA at 25 °C, 170 V), enabling high-efficiency power conversion in engine control units and DC/DC converters.

For engineers reviewing the STPS40170CGY-TR datasheet, STPS40170CGY-TR pinout, STPS40170CGY-TR application, or STPS40170CGY-TR equivalent, key selection criteria include avalanche rating (14.1 kW @ 1 µs), thermal resistance (1.2 °C/W j-c per diode), AEC-Q101 qualification, and dual-diode configuration with shared center tab for thermal coupling in high-reliability automotive power supplies.

Technical Context

This dual Schottky rectifier integrates two independent 170 V / 20 A diodes in a single D2PAK package with a common center tab for mechanical and thermal integration. Its design emphasizes thermal stability under transient load conditions, supported by low R_th(j-c) (1.2 °C/W per diode) and avalanche-rated surge capability (250 A non-repetitive, 10 ms).

The device operates across -40 to +175 °C junction temperature range and features controlled dV/dt immunity (10,000 V/µs) to prevent false triggering in noisy automotive environments. Static characteristics are specified at both 25 °C and 125 °C, with forward voltage tightly bounded (0.69–0.75 V typ./max at 20 A, 125 °C) and leakage current limited to 30 mA max at 125 °C, 170 V.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263-3L), surface-mount, epoxy-molded, UL94 V0 compliant, with exposed copper center tab for thermal and mechanical anchoring.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage Schottky rectifier applications.

Compared with STPS30170CGY-TR and VS-40CPH017-M3/45, the STPS40170CGY-TR uniquely combines AEC-Q101 certification, 20 A per diode rating, and 1.2 °C/W thermal resistance-making it the only option qualified for high-current, high-temperature engine bay rectification without external derating.

Availability

STPS40170CGY-TR is available at Aetrix Electronics and suitable for engine control units, automotive DC/DC converters, and electric power steering modules requiring stable component supply across extended product lifecycles.

Supply support for STPS40170CGY-TR 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 for automotive, industrial, and consumer markets.

The STPS40170CGY-TR belongs to ST's automotive-qualified Schottky rectifier product line, engineered specifically for high-reliability power conversion in under-hood applications where thermal resilience, surge immunity, and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum allowable case temperature for continuous operation?

The device is rated for I_F(AV) = 20 A per diode at T_c = 150 °C, with absolute maximum junction temperature of 175 °C. Using R_th(j-c) = 1.2 °C/W, sustained case temperatures above 150 °C require derating to maintain T_j ≤ 175 °C. Thermal design must account for ambient, PCB copper area, and heatsink interface resistance.

Is the center tab electrically isolated from the anodes?

No-the center tab (K) is the common cathode terminal for both internal diodes and is electrically connected to the cathode metallization. It must be treated as a live high-current node and cannot serve as a ground reference unless the entire circuit shares that cathode potential. Isolation requires external insulation between tab and heatsink.

How does the dual-diode configuration affect thermal coupling?

The shared center tab creates strong thermal coupling between diodes, meaning power dissipated in one diode raises the junction temperature of both. This is accounted for in the thermal model: ΔT_j(diode1) = P₁ × R_th(j-c) + P₂ × R_th(c), where R_th(c) = 0.5 °C/W represents inter-diode coupling. Asymmetric loading thus requires joint thermal analysis.

Can this part replace a single-diode Schottky in existing designs?

Yes-if the PCB footprint accommodates D2PAK and the circuit uses only one anode (A1 or A2), the unused anode must be left unconnected or tied to cathode (K) to prevent floating node issues. However, full benefit (e.g., dual-rail generation or redundancy) requires redesign to utilize both anodes and leverage the shared thermal path.