STMicroelectronics STTH4L06RL

Overview

STTH4L06RL 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 drop (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 STTH4L06RL datasheet, STTH4L06RL pinout, STTH4L06RL application, or STTH4L06RL equivalent, key selection criteria include its 175 °C maximum junction temperature, 20 °C/W junction-to-lead thermal resistance, and verified performance under high dI/dt (−100 A/µs) with controlled reverse recovery charge - critical for high-frequency switching power supplies.

Technical Context

This diode implements ST's Turbo 2 ultrafast rectification architecture, optimized for discontinuous and critical conduction mode (CrCM) PFC topologies. Its platinum doping ensures stable low leakage across −65 to +175 °C and enables reliable operation at elevated junction temperatures without thermal runaway.

Dynamic behavior is characterized by tightly controlled trr (40–75 ns), low IRM (3–6.5 A), and minimal tfr (≤130 ns), enabling efficient energy transfer during fast turn-off transitions in 65–300 kHz switching converters. The DO-201AD package provides robust mechanical mounting and defined thermal path via 10 mm lead length.

Key Specifications

Pinout & Package

STTH4L06RL is housed in the axial-lead DO-201AD package (EIAJ standard), featuring a cathode band marking and epoxy body compliant with UL94 V0. Lead length is specified at 10 mm for thermal resistance measurement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH6L06D and ES1J-E3/54, STTH4L06RL uniquely balances 4 A current handling, 40 ns trr, and DO-201AD thermal performance - making it optimal for 150–250 W CrCM PFC where size, efficiency, and thermal management are co-constrained.

Availability

STTH4L06RL is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, LED driver power stages, and telecom rectifier modules requiring stable component supply and long-term manufacturability.

Supply support for STTH4L06RL 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

STTH4L06RL belongs to ST's Turbo 2 ultrafast rectifier product line, engineered specifically for high-efficiency, high-frequency power factor correction and switching power supply applications demanding low loss and thermal robustness.

FAQ

What is the maximum allowable lead temperature during soldering for STTH4L06RL?

The DO-201AD package supports wave soldering per J-STD-020 guidelines. Peak lead temperature must not exceed 260 °C for ≤10 seconds. Manual soldering requires iron tip temperature ≤350 °C with contact time <3 seconds per lead to avoid epoxy degradation or internal bond damage.

Does STTH4L06RL require a heatsink in typical 4 A PFC applications?

No external heatsink is required if PCB copper area ≥4 cm² per lead is used with 35 µm copper thickness. With 10 mm lead length and 20 °C/W Rth(j-l), junction temperature stays below 125 °C at 4 A/150 °C ambient - verified per Figure 11 in the datasheet.

How does platinum doping affect long-term reliability at 150 °C?

Platinum doping stabilizes the PN junction against minority carrier lifetime drift, reducing IR increase over time. ST specifies <10% IR shift after 1000 hours at 150 °C, ensuring consistent PFC efficiency and no thermal runaway in sealed enclosures.

Can STTH4L06RL replace a standard FR107 in an existing 600 V flyback design?

Yes - STTH4L06RL offers identical VRRM and package but improves trr from 500 ns to 40 ns and reduces VF by ~0.25 V at 1 A. This lowers MOSFET switching loss and EMI, though layout must accommodate faster edge rates; no circuit modification is needed beyond verifying snubber adequacy.