STMicroelectronics STTH4L06QRL

Overview

STTH4L06QRL 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 and is engineered as a boost diode in discontinuous or critical conduction mode PFC circuits.

For engineers reviewing the STTH4L06QRL datasheet, STTH4L06QRL pinout, STTH4L06QRL application, or STTH4L06QRL equivalent, key selection criteria include its low 0.90 V forward voltage at 4 A/150 °C, 175 °C maximum junction temperature, and low leakage (<3 µA at 25 °C), critical for high-efficiency, thermally constrained AC-DC front-end designs.

Technical Context

This device implements a platinum-doped ultrafast recovery structure optimized for high dI/dt operation (up to −100 A/µs), delivering 40–55 ns trr with low IRM (3–6.5 A) under 400 V reverse bias. Its thermal design supports Rth(j-l) = 20 °C/W (lead length = 10 mm), enabling robust power dissipation in compact board layouts.

The diode exhibits VF = 0.90 V (typ.) at IF = 4 A and Tj = 150 °C, and maintains stable dynamic performance across junction temperatures up to 175 °C - essential for sustained operation in high-density SMPS and industrial power supplies.

Key Specifications

Pinout & Package

Package: DO-201AD - axial-leaded, epoxy-encapsulated, UL94 V0 compliant, cathode band marked. Dimensions: 25.4 mm body length (B), 9.5 mm max height (A), 5.3 mm max diameter (C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH6L06QRL and VS-4EY60-M3/45, STTH4L06QRL offers optimal balance of low VF, tight trr distribution, and proven field reliability in mid-power PFC - making it preferred for cost-sensitive, thermally constrained 300–600 W designs.

Availability

STTH4L06QRL is available at Aetrix Electronics and suitable for boost PFC stages, AC-DC power supply output rectification, motor drive DC bus clamp, and uninterruptible power supply (UPS) input stages requiring stable component supply and long-term industrial availability.

Supply support for STTH4L06QRL 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 industrial, automotive, and consumer markets.

STTH4L06QRL belongs to the Turbo 2 ultrafast rectifier product line, developed specifically for high-efficiency, high-frequency power factor correction and switching power supply applications demanding low loss and thermal resilience.

FAQ

What is the maximum allowable lead temperature during soldering for STTH4L06QRL?

The DO-201AD package supports wave soldering with peak lead temperature ≤ 260 °C for 10 seconds max, per ST's recommended process. Hand soldering must not exceed 350 °C for ≤ 3 seconds per lead. Exceeding these limits risks internal bond wire damage or epoxy delamination.

Does STTH4L06QRL require a heatsink in standard TO-220-equivalent layouts?

No heatsink is required when mounted on ≥ 2 cm² of 35 µm copper on FR-4 with 10 mm lead length, given its Rth(j-l) = 20 °C/W and 4 A IF(AV) dissipation (~3.5 W max). Thermal simulation is advised if ambient exceeds 70 °C or copper area is reduced below 1.5 cm².

How does platinum doping affect STTH4L06QRL's reliability versus standard fast recovery diodes?

Platinum doping stabilizes minority carrier lifetime, yielding consistent trr and low IRM across temperature and aging. Unlike gold-doped diodes, it avoids parametric drift over 10+ years - verified by ST's 1000-hour HTOL testing at 175 °C with <5% VF shift.

Can STTH4L06QRL replace STTH8L06 in existing designs?

No - STTH8L06 has 8 A IF(AV) and different thermal resistance (Rth(j-l) = 15 °C/W). Substituting STTH4L06QRL risks thermal runaway at >4.5 A. Derating to 3.2 A avg is mandatory, and PCB copper area must be increased by ≥30% to compensate for higher Rth(j-l).