STMicroelectronics STTH2002CT

Overview

STTH2002CT from STMicroelectronics is a dual center-tap ultrafast recovery rectifier diode in TO-220AB package, rated for 2 × 10 A average forward current per diode, 200 V repetitive peak reverse voltage, and 22 ns typical reverse recovery time. It delivers low conduction losses (VF = 0.78 V typ. at 10 A, 150 °C) and high thermal robustness (Tj max = 175 °C), enabling use in high-frequency switch-mode power supplies and DC/DC converters.

For engineers reviewing the STTH2002CT datasheet, STTH2002CT pinout, STTH2002CT application, or STTH2002CT equivalent, key selection criteria include dual-diode thermal coupling behavior, insulated case rating (TO-220FPAB variant offers 2000 VRMS isolation), junction-to-case thermal resistance (2.5 °C/W per diode), and dynamic performance under high dIF/dt (200 A/µs).

Technical Context

This dual-center-tap diode integrates two independent ultrafast epitaxial planar junctions in a single TO-220AB thermally coupled package. Its low trr (22 ns typ.) and low Qrr support high-frequency operation up to several hundred kHz in resonant and phase-shifted topologies.

The device operates with symmetrical conduction paths sharing a common cathode terminal, enabling center-tapped transformer secondary rectification. Thermal design must account for cross-coupling: simultaneous conduction in both diodes raises junction temperature via Rth(c) = 0.7 °C/W coupling path, requiring derating per Table 2's IF(peak) limits at TC = 115–150 °C.

Key Specifications

Pinout & Package

Package: TO-220AB - three-terminal through-hole plastic package with metal tab (cathode-connected heatsink surface), non-insulated, rated for mechanical mounting torque of 0.55 N·m (max 0.7 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 STTH2002CR and STTH2002CG, the STTH2002CT offers superior mechanical robustness and ease of heatsink attachment via TO-220AB screw-mount, while maintaining identical ultrafast switching performance-making it optimal for industrial power supplies requiring field-serviceable thermal interfaces.

Availability

STTH2002CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and automotive on-board chargers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STTH2002CT 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion, with STTH2002CT specifically engineered for center-tapped SMPS topologies demanding ultrafast recovery, low VF, and rugged thermal performance in TO-220 form factor.

FAQ

What is the maximum recommended heatsink thermal resistance for STTH2002CT at 10 A per diode?

At 10 A per diode and 150 °C junction temperature, power dissipation is ~7.8 W per diode. With Rth(j-c) = 2.5 °C/W and assuming 25 °C ambient, the total allowable Rth(c-a) is ≤12.5 °C/W. Subtracting Rth(j-c), the heatsink must provide ≤10 °C/W thermal resistance to maintain safe operation.

Can STTH2002CT be used in non-center-tapped configurations?

Yes - though optimized for center-tap use, its dual-anode structure allows independent use as two discrete ultrafast diodes. However, shared cathode limits floating configurations; A1 and A2 cannot be biased to different reference potentials without violating common-cathode constraint.

Is the TO-220AB package of STTH2002CT electrically insulated?

No - the TO-220AB package has an electrically conductive metal tab connected to the common cathode (K). For isolation, ST offers the STTH2002CFP variant in TO-220FPAB package, which provides 2000 VRMS insulation between tab and leads.

How does thermal coupling affect derating when both diodes conduct simultaneously?

When both diodes conduct, heat from one diode raises the other's junction temperature via Rth(c) = 0.7 °C/W. At 10 A per diode, each dissipates ~7.8 W, causing ~5.5 °C rise in the adjacent diode. This requires derating total current to ≤18 A combined to stay within 175 °C Tj limit under worst-case thermal conditions.