STMicroelectronics STTH3R04RL

Overview

STTH3R04RL from STMicroelectronics is an ultrafast recovery silicon rectifier diode rated for 400 V repetitive peak reverse voltage, 3 A average forward current, and 18 ns typical reverse recovery time at 100 A/µs dIF/dt. It uses platinum-doped planar junction technology, operates up to 175 °C junction temperature, and is packaged in DO-201AD for high-frequency inverters and transistor base drive circuits.

For engineers reviewing the STTH3R04RL datasheet, STTH3R04RL pinout, STTH3R04RL application, or STTH3R04RL equivalent, this diode is selected for low-loss switching in SMPS output rectification, freewheeling paths, and polarity protection where fast trr, low VF (0.9 V typ at 150 °C), and robust surge capability (60 A IFSM) are critical.

Technical Context

The STTH3R04RL employs Pt-doped planar junction technology to achieve negligible switching losses and controlled minority carrier lifetime. Its dynamic performance is characterized by trr = 18 ns (typ) at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V, and IRM = 4–5.5 A under high-stress conditions (IF = 3 A, dIF/dt = −200 A/µs, VR = 320 V, Tj = 125 °C).

Thermal design is supported by Rth(j-l) = 22 °C/W (DO-201AD, 10 mm lead length on infinite heatsink) and Rth(j-a) curves showing strong dependence on PCB copper area. The device exhibits VF = 0.9–1.15 V across Tj = 150 °C at IF = 3.0 A, enabling predictable conduction loss modeling via P = 0.9 × IF(AV) + 0.083 × IF²(RMS).

Key Specifications

Pinout & Package

STTH3R04RL is housed in a DO-201AD axial-leaded package with cathode indicated by a band on the body. Leads are tinned and compatible with standard wave soldering profiles. Thermal performance assumes 10 mm straight lead length on infinite heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3R04RL, STTH3L06 offers higher voltage headroom at the cost of reduced speed and efficiency, while BYV26E trades environmental compliance and dynamic performance for legacy compatibility and lower unit cost.

Availability

STTH3R04RL is available at Aetrix Electronics and suitable for high-frequency SMPS output rectification, freewheeling diode applications in DC-DC converters, and polarity protection in 24 V industrial power inputs requiring stable component supply and consistent DO-201AD packaging.

Supply support for STTH3R04RL 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, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion with ultrafast recovery diodes optimized for switching frequencies above 200 kHz, emphasizing low trr, low VF, and high Tj capability in standardized packages.

FAQ

What is the maximum allowable lead temperature during soldering for STTH3R04RL?

The STTH3R04RL DO-201AD package is rated for wave soldering with peak lead temperature up to 260 °C for 10 seconds, per JEDEC J-STD-020. Reflow profiles must comply with ST's specified thermal limits, and lead-free assembly requires verification against the inner box label's soldering condition ratings.

Does STTH3R04RL have a specified junction-to-ambient thermal resistance (Rth(j-a))?

No single Rth(j-a) value is specified; instead, Figure 4 in the datasheet provides Rth(j-a) versus pulse duration and PCB copper area for DO-201AD. At steady-state with 1 cm² copper per lead on FR4, Rth(j-a) is approximately 50–60 °C/W - design must use the curve-based method, not a fixed number.

Can STTH3R04RL replace a standard PN junction rectifier like 1N4007 in a 50 Hz power supply?

No - STTH3R04RL is optimized for high-frequency switching (≥100 kHz), not line-frequency rectification. Its low stored charge causes excessive EMI and ringing at 50/60 Hz, and its 3 A IF(AV) rating assumes active cooling, unlike the 1N4007's 1 A rating at ambient temperature with no heatsink.

Is STTH3R04RL suitable for automotive under-hood applications?

STTH3R04RL is not automotive-grade (AEC-Q101 qualified) and lacks extended temperature validation beyond 175 °C junction limit. While it operates up to 175 °C, automotive under-hood use requires qualification for vibration, thermal cycling, and long-term reliability - ST recommends AEC-Q101 parts like STTH3R04-Y for such environments.