STMicroelectronics STPS20100CT

Overview

STPS20100CT from STMicroelectronics is a high-voltage dual common-cathode Schottky rectifier optimized for switch-mode power supplies, featuring 100 V repetitive peak reverse voltage (VRRM), 2 × 10 A average forward current (IF(AV)), and 0.7 V max forward voltage drop at 10 A/125°C. It delivers negligible switching losses and low junction capacitance (100 pF at 100 V), enabling efficient high-frequency operation in DC-DC converters and AC-DC front-ends.

For engineers reviewing the STPS20100CT datasheet, STPS20100CT pinout, STPS20100CT application, or STPS20100CT equivalent, key selection criteria include its dual-diode TO-220AB thermal performance (Rth(j-c) = 1.6 °C/W per diode), avalanche surge capability (200 A non-repetitive), and low-noise conduction behavior critical for EMI-sensitive power stages.

Technical Context

This device integrates two independent Schottky diodes in a single TO-220AB package with shared cathode (K) and separate anodes (A1, A2), enabling synchronous rectification or dual-output configurations. Its low dV/dt rating (1000 V/µs) and minimal stored charge support fast recovery without snubbers in resonant topologies.

The thermal design relies on case-conduction cooling: junction-to-case resistance is 1.6 °C/W per diode, but total thermal resistance drops to 0.9 °C/W when both diodes operate simultaneously due to internal coupling (Rth(c) = 0.15 °C/W). Conduction loss modeling uses P = 0.55 × IF(AV) + 0.015 × IF²(RMS).

Key Specifications

Pinout & Package

TO-220AB package with isolated mounting tab (electrically connected to cathode K), standardized mechanical outline per JEDEC. Mounting torque: 0.55 N·m recommended (max 0.7 N·m). Epoxy meets UL94 V0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VB20100C-E3/45 and SS20100CT, STPS20100CT offers the lowest VF (0.7 V) and best thermal coupling (Rth(j-c) = 1.6 °C/W) with cathode-integrated tab, making it optimal for space-constrained, thermally aggressive SMPS where efficiency and reliability are prioritized over automotive qualification or isolation.

Availability

STPS20100CT is available at Aetrix Electronics and suitable for server power supplies, laptop adapters, industrial motor drives, and telecom intermediate bus converters requiring stable component supply and long-term manufacturability.

Supply support for STPS20100CT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS20100CT specifically engineered for medium-voltage, high-frequency Schottky rectification in space- and thermally constrained switch-mode systems.

FAQ

What is the maximum allowable case temperature for continuous operation?

The datasheet specifies IF(AV) = 10 A per diode at Tc = 110°C. Exceeding 110°C case temperature reduces average current derating per Figure 2; sustained operation above 110°C risks thermal runaway due to negative dPtot/dTj slope. For reliable 20 A total device current, Tc must be maintained ≤ 110°C with appropriate heatsinking.

Can STPS20100CT be used in reverse polarity protection circuits?

Yes - configured with A1/A2 as inputs and K as output, it provides low-VF forward conduction while blocking reverse current. However, its 100 V VRRM limits use to ≤ 70 V systems; for higher reverse voltage blocking, a dedicated ideal diode controller or MOSFET solution is recommended.

Is the metal tab electrically isolated from the cathode terminal?

No - the TO-220AB metal tab is internally connected to the common cathode (K) pin. This provides direct thermal conduction to the heatsink but requires electrical insulation between heatsink and system ground unless K is grounded. Use insulating pads or shoulder washers if isolation is needed.

How does the dual-diode configuration affect thermal coupling during simultaneous conduction?

When both diodes conduct, thermal coupling reduces total Rth(j-c) from 1.6 °C/W × 2 to 0.9 °C/W due to shared heat flow through the common tab. The datasheet provides coupled thermal equations: Tj−Tc(diode1) = P1 × 1.6 + P2 × 0.15, confirming cross-heating must be modeled for accurate junction temperature prediction.