STMicroelectronics STTH4L06Q

Overview

STTH4L06Q from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in DO-201AD package, rated for 600 V repetitive peak reverse voltage, 4 A average forward current, and 55 ns typical reverse recovery time (at 1 A, −100 A/µs). It uses platinum-doped Turbo 2 technology to achieve low leakage (<3 µA at 25 °C) and low forward voltage (0.90 V typ. at 4 A, 150 °C), making it suitable as a boost diode in critical-conduction-mode PFC stages.

For engineers reviewing the STTH4L06Q datasheet, STTH4L06Q pinout, STTH4L06Q application, or STTH4L06Q equivalent, key selection criteria include its 175 °C maximum junction temperature, 20 °C/W junction-to-lead thermal resistance, and verified performance under high dIF/dt (−100 A/µs) with controlled IRM (≤6.5 A at 150 °C).

Technical Context

This diode implements ST's Turbo 2 ultrafast switching architecture with platinum diffusion to suppress minority carrier lifetime-enabling fast trr while maintaining low VF and low IR. Its dynamic behavior is characterized under defined dIF/dt conditions (−50 to −100 A/µs) and VR (30–400 V), with trr varying from 40 ns to 75 ns depending on test setup.

The device operates up to 175 °C junction temperature and features a DO-201AD package with 10 mm lead length, delivering Rth(j-l) = 20 °C/W and Rth(j-a) = 75 °C/W (free air). Conduction loss is quantified by P = 0.92 × IF(AV) + 0.0045 × IF²(RMS), supporting accurate thermal modeling in high-frequency power supplies.

Key Specifications

Pinout & Package

STTH4L06Q is housed in a DO-201AD axial-leaded package with cathode band marking. The device has two terminals: Anode (A) and Cathode (K), with polarity indicated by a painted band on the cathode end.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast high-voltage rectifier applications.

Compared with STTH6L06 and ES1J, STTH4L06Q uniquely balances 4 A current capability, 40 ns trr, and 175 °C operation in DO-201AD-making it optimal for thermally constrained 100–200 W industrial PFC where both efficiency and reliability are prioritized.

Availability

STTH4L06Q is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, server PSU boost PFC stages, and motor drive input rectification requiring stable component supply across multi-year production cycles.

Supply support for STTH4L06Q 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STTH series belongs to ST's high-voltage rectifier product line, engineered specifically for energy-efficient power conversion in PFC, SMPS, and industrial motor control applications where ultrafast switching and thermal robustness are essential.

FAQ

Is STTH4L06Q RoHS-compliant and halogen-free?

Yes. STTH4L06Q is manufactured in ST's ECOPACK®-compliant DO-201AD package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The epoxy molding compound achieves UL94 V0 flammability rating.

What is the recommended PCB layout for thermal performance?

For optimal thermal performance, use ≥25 mm² of 35 µm copper pour connected directly to each lead (anode and cathode), with ≥10 mm lead length exposed. Avoid solder mask over thermal pads and ensure ≥1.5 mm clearance to adjacent components to maintain Rth(j-a) ≤75 °C/W in free air.

Can STTH4L06Q replace standard FRD diodes like UF4007 in PFC designs?

Yes-STTH4L06Q can replace UF4007 in critical-conduction-mode PFC, offering 40 ns trr vs. UF4007's 75 ns and lower VF (0.90 V vs. 1.7 V at 150 °C). However, its 4 A IF(AV) rating requires verification against peak current stress; UF4007's 1 A rating makes it unsuitable for equivalent power levels.

Does STTH4L06Q require a snubber circuit in 100 kHz PFC operation?

No snubber is required in typical 100 kHz critical-conduction-mode PFC designs due to its controlled 40 ns trr and low IRM (≤6.5 A). Snubbers may still be needed if layout parasitics induce voltage overshoot >650 V; verify with oscilloscope measurement of VAK during turn-off.