STMicroelectronics STTH8003CY

Overview

STTH8003CY from STMicroelectronics is an ultra-fast dual silicon rectifier diode in Max247 package, rated for 300 V repetitive peak reverse voltage, 80 A total average forward current (2 × 40 A per diode), and 60 ns maximum reverse recovery time at Tj = 125°C. It serves as a secondary-side rectifier in high-frequency SMPS and telecom power supplies where low conduction loss and soft recovery are critical.

For engineers reviewing the STTH8003CY datasheet, STTH8003CY pinout, STTH8003CY application, or STTH8003CY equivalent, key selection criteria include its dual-diode configuration, 175°C max junction temperature, 0.5 °C/W total junction-to-case thermal resistance, softness factor of 0.3, and suitability for free-wheeling and inverter topologies demanding noise-free switching.

Technical Context

This dual common-cathode ultra-fast rectifier integrates two independent diodes sharing a single cathode terminal, enabling synchronous or interleaved operation in bridge or center-tap configurations. Its soft recovery (Sfactor = 0.3) and low transient peak forward voltage (VFP ≤ 5 V) minimize EMI and snubber stress in high-dI/dt environments up to 500 A/µs.

The device operates reliably at junction temperatures up to +175°C due to low leakage (80 µA at 300 V, 25°C) and optimized thermal design (Rth(j–c) = 0.5 °C/W total). Dynamic parameters-including trr (50–60 ns), tfr (450 ns), and IRM (13 A)-are characterized across dIF/dt (200 A/µs) and temperature (25–125°C), supporting precise loss modeling in DC–DC converters.

Key Specifications

Pinout & Package

STTH8003CY is housed in the Max247 package-a molded, isolated, dual-diode outline with three external terminals: two anodes (A1, A2) and one common cathode (K). The case serves as the thermal path and is electrically isolated from all terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1603CG and MBR4030CT, STTH8003CY uniquely delivers dual 40 A rectification in one thermally optimized package with 300 V rating and 175°C operation-making it irreplaceable in space-constrained, high-reliability telecom and industrial SMPS where both voltage headroom and thermal resilience are non-negotiable.

Availability

STTH8003CY is available at Aetrix Electronics and suitable for telecom power supplies, welding equipment, high-frequency inverters, and industrial DC–DC converters requiring stable component supply and long-lifecycle support.

Supply support for STTH8003CY 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 automotive, industrial, and consumer markets.

STTH8003CY belongs to ST's high-voltage ultra-fast rectifier product line, engineered specifically for high-frequency, high-reliability power conversion where soft recovery, thermal robustness, and dual-diode integration are essential.

FAQ

What is the thermal interface requirement for STTH8003CY?

The STTH8003CY Max247 package requires direct metal-to-metal contact between its isolated case and a heatsink. No insulating pad is needed, as the case is electrically isolated. Mounting torque must be 0.5–0.7 N·m to ensure Rth(j–c) = 0.5 °C/W; excessive torque risks cracking the epoxy body and degrading thermal performance.

Can STTH8003CY replace a single 80 A standard recovery diode?

No-it contains two independent 40 A diodes with a shared cathode, not a single 80 A device. Replacing a monolithic 80 A diode would require verifying that the circuit topology supports dual-anode inputs (e.g., center-tap or interleaved windings) and that thermal spreading across both die meets system requirements.

Is STTH8003CY RoHS compliant and halogen-free?

Yes. Per STMicroelectronics' official documentation (Doc ID 11712, Rev 4), STTH8003CY conforms to RoHS Directive 2011/65/EU and is manufactured using halogen-free epoxy molding compound meeting IEC 61249-2-21 requirements.

How does softness factor affect EMI in STTH8003CY applications?

A softness factor of 0.3 indicates gradual current decay during reverse recovery, reducing di/dt-induced voltage spikes and high-frequency ringing. This directly lowers conducted EMI in the 30–300 MHz band, easing compliance with EN 55032 Class B limits without additional filtering components.