STMicroelectronics STTH3R04S

Overview

STTH3R04S from STMicroelectronics is a 400 V, 3 A ultrafast recovery diode using platinum-doped planar junction technology, optimized for high-frequency switching in low-voltage inverters, free-wheeling paths, and polarity protection circuits. Typical forward voltage is 0.9 V at 150 °C and 3.0 A, reverse recovery time is 18 ns (IF = 1 A, dIF/dt = −100 A/µs), and maximum junction temperature is 175 °C.

For engineers reviewing the STTH3R04S datasheet, STTH3R04S pinout, STTH3R04S application, or STTH3R04S equivalent, key selection criteria include ultrafast trr performance under high dIF/dt conditions, thermal robustness up to 175 °C, low conduction loss profile (P = 0.9 × IF(AV) + 0.083 × IF²(RMS)), and SMC package suitability for automated surface-mount assembly in power conversion modules.

Technical Context

This diode employs Pt-doped planar technology to achieve negligible switching losses and tightly controlled minority carrier lifetime, enabling stable ultrafast recovery across temperature and current slew rates. Its dynamic behavior is characterized by low QRR (typ. 35 nC at Tj = 125 °C, dIF/dt = 200 A/µs) and minimal IRM (4–5.5 A under same conditions).

The SMC package provides Rth(j-l) = 17 °C/W (on infinite heatsink), supporting high-power density designs where lead-to-PCB thermal conduction dominates cooling. Reverse leakage remains ≤50 µA at 125 °C and VR = 400 V, ensuring reliability in elevated ambient environments.

Key Specifications

Pinout & Package

STTH3R04S is housed in an SMC (DO-214AB) surface-mount package with cathode indicated by a band on the body. The device has two terminals: anode and cathode, with no internal connections or control pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR340SM and VSKY340A-M3/5AT, STTH3R04S delivers the lowest combined conduction–switching loss profile among 3 A / 400 V ultrafast diodes in SMC, making it optimal for thermally constrained, high-frequency power stages where efficiency and EMI control are critical.

Availability

STTH3R04S is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, motor drive clamp circuits, and industrial PLC polarity protection requiring stable component supply, consistent parametric performance, and RoHS-compliant SMC packaging.

Supply support for STTH3R04S 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 silicon solutions for automotive, industrial, and power management applications.

STTH3R04S belongs to ST's Ultrafast Recovery Diode product line, engineered specifically for high-efficiency, high-frequency power conversion systems where low trr, low VF, and high Tj capability are essential.

FAQ

What is the maximum allowable peak forward surge current for STTH3R04S?

The STTH3R04S supports IFSM = 60 A for non-repetitive sinusoidal pulses of 10 ms duration at 25 °C ambient. This rating applies to short-term overload events such as motor startup or capacitor charging transients, and must be derated linearly to 0 A at 175 °C junction temperature per ST's absolute ratings table.

Can STTH3R04S replace STTH3R04U in the same PCB footprint?

No - STTH3R04S uses the SMC (DO-214AB) package (E = 7.75–8.15 mm), while STTH3R04U uses SMB (DO-214AA) (E = 5.10–5.60 mm). Their land patterns differ in width, length, and pad spacing; mechanical interference and solder joint reliability would be compromised without PCB redesign.

How does junction temperature affect reverse recovery time in STTH3R04S?

trr increases with rising Tj: at dIF/dt = −100 A/µs, trr rises from 18 ns (25 °C) to ~28 ns (125 °C), per Figure 9. This 56% increase must be factored into timing margins for >400 kHz operation in high-ambient environments to avoid overlap-induced losses.

Is STTH3R04S rated for automotive under-hood applications?

No - STTH3R04S is not qualified to AEC-Q101 and lacks automotive-specific qualification documentation. While its 175 °C Tj rating exceeds typical under-hood requirements, ST explicitly states in its disclaimer that non-automotive-grade parts are used in automotive applications at the user's own risk and without warranty.