STMicroelectronics STPS20170CT

Overview

STPS20170CT from STMicroelectronics is a dual-center-tap high-voltage Schottky rectifier diode in TO-220AB package, rated for 170 V repetitive peak reverse voltage, 2 × 10 A average forward current per diode, and 175 °C maximum junction temperature. It delivers low forward voltage drop (0.69 V typ. at 10 A, 125 °C), supports high-frequency switched-mode power supplies, and features avalanche-rated capability up to 480 W (10 µs pulse).

For engineers reviewing the STPS20170CT datasheet, STPS20170CT pinout, STPS20170CT application, or STPS20170CT equivalent, key selection criteria include reverse voltage margin, thermal resistance (R_th(j-c) = 1.3 °C/W total), dual-diode center-tap configuration, and TO-220AB mechanical compatibility with standard heatsink mounting.

Technical Context

This dual Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap topology), enabling synchronous rectification or dual-output DC/DC conversion. Its low VF and fast recovery eliminate minority-carrier storage delay, making it suitable for >100 kHz SMPS topologies where conduction loss and switching loss trade-offs are critical.

The device operates across -65 °C to +175 °C junction temperature range, with avalanche energy rating validated under 10 µs pulses at T_j = 125 °C. Thermal design requires attention to case-to-heatsink interface due to R_th(j-c) = 1.3 °C/W (total) and recommended torque of 0.55 N·m for mounting screw.

Key Specifications

Pinout & Package

STPS20170CT uses the TO-220AB package: insulated plastic body with metal tab (cathode-connected), three leads, and screw-mounting hole. Package meets UL 94 V0 flammability rating and provides 2000 V_RMS insulation between tab and leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH07 and MUR1020CT, STPS20170CT offers optimal balance of low VF, TO-220AB mechanical compatibility, and integrated center-tap topology-making it preferred for space-constrained, high-efficiency 100–300 W SMPS where thermal interface simplicity and layout density are prioritized.

Availability

STPS20170CT is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, and telecom DC/DC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STPS20170CT 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 automotive, industrial, and consumer markets.

The STPS20170CT belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC and DC/DC conversion in demanding industrial and telecom infrastructure applications.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS20170CT supports continuous operation with case temperature (T_C) up to 155 °C for each diode when delivering 10 A average forward current. At T_C = 155 °C, total device current is 20 A. Exceeding this requires derating per Figure 2 in the datasheet, which shows linear reduction to 0 A at T_C = 175 °C.

Is the metal tab electrically isolated from the leads?

Yes-the TO-220AB package used in STPS20170CT provides 2000 V_RMS insulation between the metal tab (cathode) and all three leads. This eliminates the need for insulating pads or shoulder washers when mounting to grounded heatsinks, simplifying thermal design and improving long-term reliability.

Can STPS20170CT be used in parallel with another identical device?

No-parallel operation is not recommended. The device's center-tap configuration and shared cathode make inter-device current sharing unbalanced without external ballasting resistors. For higher current needs, use a single higher-rated part like STPS30L100CG (30 A, D²PAK) or redesign with discrete anode routing.

Does STPS20170CT require a heatsink in typical 10 A applications?

Yes-a heatsink is mandatory. At 10 A per diode and 0.69 V forward drop, power dissipation exceeds 6.9 W per diode. With R_th(j-c) = 1.3 °C/W (total), even a modest 20 °C heatsink-to-ambient rise would exceed T_j = 175 °C without forced airflow or adequate copper area. Use ≥100 cm² 2 oz copper pad or extruded aluminum heatsink.