STMicroelectronics STTH2003CT

Overview

STTH2003CT from STMicroelectronics is a dual-center-tap ultrafast recovery rectifier diode in TO-220AB package, rated for 300 V repetitive peak reverse voltage, 2 × 10 A average forward current per diode at TC = 140 °C, and 25 ns maximum reverse recovery time. It delivers soft, noise-free switching with 0.85 V typical forward voltage at 125 °C and is engineered for secondary-side rectification in high-frequency telecom power supplies and isolated DC/DC converters.

For engineers reviewing the STTH2003CT datasheet, STTH2003CT pinout, STTH2003CT application, or STTH2003CT equivalent, this device requires attention to thermal resistance (R_th(j-c) = 2.5 °C/W per diode), center-tap configuration, insulated mounting requirements for TO-220FPAB variants, and conduction loss modeling using P = 0.75 × I_F(AV) + 0.025 × I_F(RMS)².

Technical Context

The STTH2003CT integrates two independent fast-recovery epitaxial diodes in a single center-tapped TO-220AB package, enabling synchronous or complementary rectification topologies without external interconnection. Its soft recovery (S factor ≥ 0.3) minimizes EMI generation during turn-off, while the 300 V V_RRM rating supports wide-input-range 48 V telecom systems and 24–48 V industrial DC/DC stages.

Thermal design relies on junction-to-case conduction through the metal tab, with R_th(j-c) = 2.5 °C/W per diode and total device R_th(j-c) = 1.3 °C/W when both diodes operate simultaneously. Reverse leakage remains ≤ 30 µA at 125 °C, supporting stable operation in thermally constrained enclosures.

Key Specifications

Pinout & Package

STTH2003CT uses the TO-220AB package: insulated plastic body with metal tab (pin 3), three leads - pin 1 (anode of diode 1), pin 2 (center tap/cathode common), pin 3 (anode of diode 2). The tab is electrically connected to pin 2 and must be mounted to heatsink with insulating washer if referenced to non-ground potential.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2003CR, the STTH2003CT offers superior mechanical stability in high-vibration telecom racks; versus VS-20CTQ030PbF, it provides guaranteed 300 V blocking and lower leakage at elevated temperature-critical for long-life medical and industrial deployments.

Availability

STTH2003CT is available at Aetrix Electronics and suitable for telecom power supplies, isolated DC/DC converters, and server VRM intermediate bus rectification requiring stable component supply and long-term lifecycle support.

Supply support for STTH2003CT 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and communications markets.

The STTH series targets high-efficiency, high-reliability power conversion in telecom infrastructure and industrial power supplies, emphasizing ultrafast soft recovery, high-temperature robustness, and ECOPACK®2 environmental compliance.

FAQ

What is the correct mounting orientation and insulation requirement for STTH2003CT?

The metal tab (pin 2) is electrically connected to the common cathode and must be insulated from the heatsink unless the cathode node is at chassis ground potential. Use a mica or ceramic washer with thermal grease; torque mounting screw to 0.55 N·m (max 0.70 N·m) to ensure consistent R_th(j-c) performance.

Can STTH2003CT replace two discrete STTH1003DIP diodes in an existing design?

Yes-STTH2003CT matches the electrical specs of two STTH1003DIP diodes (300 V, 10 A, 25 ns t_rr) but integrates them in one TO-220AB package with shared cathode. Layout changes are required: relocate transformer center tap to pin 2 and route pins 1 and 3 to opposite winding ends; verify thermal pad clearance.

How does the softness factor affect EMI in high-frequency SMPS?

A softness factor ≥ 0.3 ensures reverse recovery current decays gradually rather than abruptly, reducing di/dt-induced voltage spikes across stray inductance. This directly lowers broadband conducted EMI (30–100 MHz) and eliminates need for ferrite beads or RC snubbers in 300–500 kHz telecom converters.

What is the maximum allowable case temperature for continuous 20 A output current?

At 20 A total (10 A per diode), junction temperature reaches 175 °C when case temperature is 140 °C-per datasheet rating. To sustain this, heatsink thermal resistance must be ≤ 1.0 °C/W (including interface) with ambient ≤ 60 °C; exceeding 140 °C case risks accelerated parametric drift and reduced lifetime.