STMicroelectronics STTH30R04WY

Overview

STTH30R04WY from STMicroelectronics is an automotive-grade ultrafast recovery diode in DO-247 package, rated for 400 V repetitive peak reverse voltage, 30 A average forward current, and 24 ns typical reverse recovery time at 25 °C. It delivers low conduction loss (VF = 1.0 V typ. at 15 A, 25 °C) and high thermal robustness (Rth(j-c) = 0.8 °C/W), enabling use in high-frequency switching power supplies for engine control units and on-board chargers.

For engineers reviewing the STTH30R04WY datasheet, STTH30R04WY pinout, STTH30R04WY application, or STTH30R04WY equivalent, key selection criteria include reverse recovery time under high dIF/dt, junction-to-case thermal resistance, AEC-Q101 qualification status, and DO-247 mechanical compatibility with forced-air or heatsink-cooled layouts.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for ultrafast soft recovery, minimizing voltage overshoot and EMI during turn-off. Its low IR (15 µA max at 25 °C, VR = 400 V) and stable VF across temperature (0.83–1.25 V at 30 A, 25–150 °C) support reliable operation in automotive ambient extremes.

The device exhibits graded carrier lifetime control to achieve trr = 24 ns (typ.) at IF = 1 A, dIF/dt = −200 A/µs, VR = 30 V, while maintaining high IFSM = 280 A (10 ms, sinusoidal) and Tj(max) = 175 °C - critical for transient-heavy traction inverters and DC-DC converters.

Key Specifications

Pinout & Package

STTH30R04WY uses a 2-terminal DO-247 package with isolated metal tab (cathode-connected case). Mounting requires 0.4–0.6 N·m torque on M3 screw; thermal interface material recommended between tab and heatsink.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast recovery diode applications.

Compared with STTH30L04WY and MUR3040CT, STTH30R04WY uniquely balances ultrafast recovery (24 ns), automotive qualification, and low thermal resistance (0.8 °C/W) - making it optimal for space- and reliability-constrained 48 V automotive power modules where both switching efficiency and under-hood survivability are mandatory.

Availability

STTH30R04WY is available at Aetrix Electronics and suitable for engine control units, on-board chargers, traction inverter auxiliary supplies, and automotive lighting drivers requiring stable component supply and AEC-Q101 compliance.

Supply support for STTH30R04WY 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, microcontroller, and sensor solutions for automotive, industrial, and consumer markets.

STTH30R04WY belongs to ST's automotive-qualified ultrafast diode product line, engineered specifically for high-efficiency, high-reliability power conversion in harsh-temperature vehicle subsystems.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The STTH30R04WY has a maximum junction temperature rating of 175 °C, verified per AEC-Q101 stress testing. Continuous operation at this limit requires thermal design ensuring Rth(j-a) ≤ 1.2 °C/W with 25 °C ambient, or use with active cooling. Derating is not required up to 135 °C case temperature at 30 A IF(AV).

Is the DO-247 package electrically isolated?

No - the metal tab (cathode terminal) is electrically connected to the cathode semiconductor region. The package provides no internal isolation; system-level insulation must be implemented via insulating thermal pads or shoulder washers when mounting to grounded heatsinks.

How does trr vary with temperature and dIF/dt?

trr increases with junction temperature (e.g., +40% at 125 °C vs. 25 °C) and decreases with higher dIF/dt (e.g., 24 ns at −200 A/µs vs. 73 ns at −15 A/µs). This behavior is documented in Figures 5 and 7 of the official datasheet (DocID024454 Rev 1).

Can STTH30R04WY replace STTH30R04DY in existing TO-220AC designs?

No - STTH30R04WY uses DO-247 packaging with different footprint, mounting hole location, and thermal interface geometry. While electrically identical, mechanical redesign is required for heatsink attachment, PCB layout, and torque specification (0.4–0.6 N·m vs. TO-220AC's 0.5–0.7 N·m).