STMicroelectronics STTH3R04

Overview

STTH3R04 from STMicroelectronics is an ultrafast recovery silicon diode optimized for high-frequency switching applications including base drive, free-wheeling, and polarity protection in low-voltage inverters. It delivers 3 A average forward current, 400 V repetitive peak reverse voltage, 18 ns typical reverse recovery time (at IF = 1 A, dIF/dt = −100 A/µs), and operates up to 175 °C junction temperature.

For engineers reviewing the STTH3R04 datasheet, STTH3R04 pinout, STTH3R04 application, or STTH3R04 equivalent, key selection criteria include ultrafast trr performance, low VF at elevated temperature (0.9 V typ at Tj = 150 °C), thermal robustness in DO-201AD/SMB/SMC packages, and suitability for SMPS, motor drives, and DC-DC converters requiring minimal switching loss.

Technical Context

The STTH3R04 employs platinum-doped planar junction technology to achieve negligible switching losses and tightly controlled reverse recovery behavior. Its dynamic characteristics are specified across temperature (25–125 °C) and dIF/dt (up to 200 A/µs), with IRM peaking at 5.5 A and QRR scaling predictably with di/dt.

Thermal design is supported by package-specific Rth(j-l) values: 22 °C/W (DO-201AD), 25 °C/W (DO-15/SMB), and 17 °C/W (SMC), all measured with 10 mm lead length on infinite heatsink. Forward conduction loss follows P = 0.9 × IF(AV) + 0.083 × IF²(RMS), enabling accurate power dissipation modeling.

Key Specifications

Pinout & Package

STTH3R04 is a two-terminal axial or surface-mount diode: anode and cathode. The cathode is marked by a band on the body. Package variants include DO-201AD (axial), DO-15 (axial), SMB (SMD), and SMC (SMD). Pinout is non-directional in function but polarity-critical in placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L04 and ES3D, the STTH3R04 uniquely balances sub-20 ns trr and sub-1.0 V VF at 150 °C in a 400 V device, making it optimal for high-efficiency, high-frequency (>150 kHz) power conversion where both switching and conduction losses must be minimized simultaneously.

Availability

STTH3R04 is available at Aetrix Electronics and suitable for switch-mode power supplies, motor drive free-wheeling, and polarity protection circuits requiring stable component supply and long-term industrial availability.

Supply support for STTH3R04 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STTH ultrafast diode product line targets high-efficiency power conversion systems, emphasizing low-loss switching, thermal resilience, and package flexibility for SMPS, motor control, and renewable energy inverters.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The STTH3R04 has a maximum rated junction temperature of 175 °C, verified under conditions of infinite heatsink with 10 mm lead length. Derating is required above 125 °C ambient depending on package and PCB copper area; Rth(j-a) curves in Figures 4–7 provide pulse and steady-state thermal guidance.

Does STTH3R04 support surface-mount assembly with standard reflow profiles?

Yes - the SMB and SMC variants (STTH3R04U and STTH3R04S) are qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. The ECOPACK® marking confirms compliance with RoHS and lead-free second-level interconnect requirements.

How does reverse recovery time vary with dIF/dt and temperature?

trr decreases with increasing dIF/dt: 35 ns at −50 A/µs, 18 ns at −100 A/µs (Tj = 25 °C). At Tj = 125 °C, trr increases ~15% versus 25 °C. Figure 9 provides normalized trr vs. dIF/dt across 25–125 °C for precise timing analysis.

Can STTH3R04 replace standard fast recovery diodes in existing 100 kHz designs?

Yes - its 18 ns trr and low QRR enable direct replacement where layout allows matching package (e.g., DO-201AD → DO-201AD), delivering measurable reduction in switching loss and EMI. Verify thermal margin using Rth(j-l) = 22 °C/W and confirm cathode band orientation matches original footprint polarity.