STMicroelectronics STTH20L03CT

Overview

STTH20L03CT from STMicroelectronics is a dual-center-tap ultrafast recovery epitaxial rectifier diode in TO-220AB package, rated for 300 V repetitive peak reverse voltage and 2 × 10 A average forward current per diode, with typical reverse recovery time of 26 ns at 25 °C and forward voltage drop of 0.95 V at 10 A/25 °C. It is engineered for secondary-side rectification in high-frequency switch-mode power supplies and DC–DC converters requiring low conduction loss and soft, noise-free switching.

For engineers reviewing the STTH20L03CT datasheet, STTH20L03CT pinout, STTH20L03CT application, or STTH20L03CT equivalent, key selection criteria include its dual-diode center-tap configuration, 26 ns trr (typ.), 0.95 V VF at 10 A, 150 A non-repetitive surge rating, and thermal resistance of 1.5 °C/W per diode junction-to-case - critical for high-density SMPS thermal management.

Technical Context

This device integrates two independent fast recovery epitaxial diodes in a single TO-220AB package with shared cathode (center-tap configuration), enabling synchronous or interleaved secondary rectification topologies. Its ultrafast soft recovery (Sfactor = 0.3 typ.) minimizes EMI generation during commutation in high-dV/dt environments.

The diode pair operates across -40 to +175 °C junction temperature range, with specified dynamic parameters including 55 ns trr (max) at 125 °C/10 A and 9–12 A peak reverse recovery current under harsh test conditions (VR = 200 V, dIF/dt = -200 A/µs), supporting robust performance in resonant and phase-shifted full-bridge converters.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (electrically connected to cathode K), featuring three terminals: two anodes (A1, A2) and one common cathode (K). Mounting hole accepts M3 screw with recommended torque of 0.55 N·m.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-center-tap ultrafast rectifier applications.

Compared with STTH20L03CG, the STTH20L03CT offers easier manual assembly and higher mechanical robustness but requires screw-mount heatsinking; versus MUR2030CT, it delivers superior efficiency and EMI performance at a modest premium, making it preferred for high-reliability telecom and industrial designs.

Availability

STTH20L03CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC–DC converters, telecom rectifier modules, and EV onboard charger auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for STTH20L03CT 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 STTH series targets high-frequency power conversion, with the STTH20L03CT specifically developed for low-loss, low-noise secondary rectification in compact, thermally demanding SMPS topologies.

FAQ

What is the maximum allowable case temperature for continuous operation?

The device supports continuous operation with case temperature up to 155 °C per diode, as defined by IF(AV) = 10 A rating at TC = 155 °C. Exceeding this requires derating per Figure 1 in the datasheet; sustained operation above 155 °C risks accelerated parameter drift and reduced reliability.

Can STTH20L03CT be used in parallel configurations?

No - the device is not characterized for paralleling due to mismatch in VF and trr between units. Parallel operation would cause current imbalance and thermal runaway. For higher current, use a single higher-rated part or multi-phase topology with independent rectifiers.

Is the TO-220AB tab electrically isolated?

Yes - the metal tab is internally connected to the common cathode (K) terminal and is not isolated. Electrical isolation must be achieved externally using insulating washers or shoulder washers when mounting to grounded heatsinks.

Does STTH20L03CT support zero-voltage switching (ZVS) topologies?

Yes - its low QRR (250–375 nC) and soft recovery (Sfactor = 0.3) minimize voltage spikes and ringback during turn-off, enabling reliable operation in phase-shifted full-bridge and LLC resonant converters where ZVS is employed.