STMicroelectronics STTH3003CW

Overview

STTH3003CW from STMicroelectronics is a dual-center-tap ultra-fast recovery epitaxial diode pair in TO-247 package, designed for secondary-side rectification in high-frequency switch-mode power supplies and DC-DC converters. It delivers 300 V repetitive peak reverse voltage, 30 A RMS forward current (per device), 40 ns max reverse recovery time, 1.25 V max forward voltage at 15 A/25°C, and 175°C maximum junction temperature.

For engineers reviewing the STTH3003CW datasheet, STTH3003CW pinout, STTH3003CW application, or STTH3003CW equivalent, key selection criteria include soft recovery behavior (S-factor ≥0.3), low conduction loss (P = 0.75×IF(AV) + 0.017×IF²(RMS)), noise-free switching in high-dV/dt environments, and thermal resistance of 1.05°C/W (junction-to-case, total).

Technical Context

This dual-diode device integrates two independent fast-recovery epitaxial diodes sharing a common cathode connection in a single TO-247 package. Its ultra-fast trr ≤40 ns and soft recovery (S-factor ≥0.3) minimize EMI generation during turn-off in high-frequency SMPS topologies like LLC resonant and synchronous rectifier-assisted flyback converters.

The device operates with a 175°C maximum junction temperature and exhibits low thermal resistance (1.05°C/W total junction-to-case), enabling high-power density designs without forced air cooling. Reverse leakage remains ≤400 µA at 125°C and 300 V, supporting stable operation under elevated thermal stress.

Key Specifications

Pinout & Package

Package: TO-247 - 3-lead, through-hole, isolated tab package with center-tab anode/cathode configuration and mechanical dimensions per STMicroelectronics mechanical drawing (L=20.0 mm, H=15.6 mm, D=2.4 mm, weight=4.36 g). Mounting torque: 0.8 N·m recommended, 1.0 N·m max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR3060CT and VS-30CPH03-M3, STTH3003CW uniquely balances 300 V rating, 40 ns trr, and guaranteed soft recovery (S ≥0.3), making it optimal for high-frequency, low-EMI SMPS where both speed and noise performance are co-constrained.

Availability

STTH3003CW is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, telecom rectifiers, and EV onboard charger auxiliary supplies requiring stable component supply and long-lifecycle support.

Supply support for STTH3003CW 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-efficiency power conversion, with STTH3003CW specifically engineered for noise-sensitive, high-frequency secondary rectification in compact, thermally demanding power systems.

FAQ

What is the thermal resistance junction-to-case for STTH3003CW?

The total junction-to-case thermal resistance (Rth(j-c)) is 1.05°C/W, measured across both diodes in the TO-247 package. This value reflects conduction through the shared copper tab and accounts for internal thermal coupling between the two die. It enables accurate heatsink sizing for natural convection or forced-air cooling in high-power-density designs.

Does STTH3003CW support center-tap transformer configurations?

Yes - STTH3003CW is explicitly designed as a dual-center-tap rectifier with independent anodes (A1, A2) and a common cathode (K). This configuration directly interfaces with center-tapped secondary windings in flyback, forward, and push-pull topologies, eliminating the need for external parallel diode connections.

How does the softness factor (S-factor) impact EMI performance?

The S-factor ≥0.3 indicates controlled, non-abrupt current decay during reverse recovery, reducing high-frequency spectral content in switching node waveforms. This directly lowers conducted and radiated EMI, decreasing filter component count and easing compliance with EN 55032 Class B limits in compact power supplies.

Can STTH3003CW replace standard FRD diodes in existing 100–200 kHz designs?

Yes - its 300 V VRRM, 30 A IF(RMS), and TO-247 footprint are pin-compatible with many legacy fast recovery diodes. However, its 40 ns trr and soft recovery deliver measurable improvements in efficiency and EMI, especially when upgrading from 100–200 ns FRDs in designs operating near 300 kHz or above.