STMicroelectronics STPS1645D

Overview

STPS1645D from STMicroelectronics is a 45 V, 16 A average forward current Schottky power rectifier in TO-220AC package, optimized for low-voltage, high-frequency DC/DC converters and SMPS secondary-side rectification with 0.57 V max forward voltage at 16 A and 125 °C junction temperature.

For engineers reviewing the STPS1645D datasheet, STPS1645D pinout, STPS1645D application, or STPS1645D equivalent, key selection criteria include conduction loss minimization (R_th(j-c) = 1.6 °C/W), surge robustness (I_FSM = 220 A), thermal stability up to 175 °C, and fast switching with negligible reverse recovery.

Technical Context

This Schottky rectifier uses a single-chip metal–semiconductor junction to eliminate minority-carrier storage delay, enabling zero reverse recovery time and dV/dt capability of 10,000 V/µs - critical for high-frequency synchronous rectification and freewheeling in 100 kHz+ switchers.

Its thermal design centers on low junction-to-case resistance (1.6 °C/W) and maximum T_j of 175 °C, allowing sustained operation at 16 A average current with proper heatsinking at T_c = 155 °C, while leakage remains below 40 mA at 125 °C and full 45 V reverse bias.

Key Specifications

Pinout & Package

TO-220AC package with isolated tab (case connected to cathode), 3-terminal configuration: Anode (pin 1), Cathode (tab + pin 2), no third signal terminal. Mounting via M3 screw with recommended torque 0.55 N·m.

Key Features

Applications

Availability

STPS1645D is available at Aetrix Electronics and suitable for server power supply rectification, telecom DC/DC converter output stages, and industrial motor drive protection requiring stable component supply and long-term BOM continuity.

Supply support for STPS1645D 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS1645D specifically engineered for low-loss, high-current Schottky rectification in next-generation SMPS and DC/DC modules.

FAQ

Is STPS1645D pin-compatible with STPS2045C?

No. STPS2045C uses TO-220AB package with electrically isolated tab, while STPS1645D uses TO-220AC with cathode-connected tab. Pin 1 (anode) and pin 2 (cathode) positions match, but thermal mounting and circuit isolation differ - direct substitution requires PCB layout revision.

What is the maximum allowable case temperature for continuous 16 A operation?

Per datasheet absolute ratings, I_F(AV) = 16 A is specified at T_c = 155 °C. Operation above this requires derating; at T_c = 100 °C, average current drops to ~12.5 A based on Fig. 2. Thermal design must ensure case temperature stays ≤155 °C under worst-case airflow and load conditions.

Can STPS1645D be used in synchronous rectification circuits?

No - STPS1645D is a passive Schottky diode, not a controlled switch. It cannot replace MOSFETs in synchronous rectifiers requiring gate drive. However, it serves as a robust, low-loss alternative where synchronous control is impractical due to cost, layout, or timing constraints.

Does STPS1645D meet RoHS and REACH requirements?

Yes. As a STMicroelectronics product manufactured after July 2003 and compliant with EU directives in effect at time of release, STPS1645D meets RoHS 2002/95/EC and REACH SVHC thresholds. Full compliance documentation is available via ST's official product page and material declarations portal.