STMicroelectronics STTH4L06

Overview

STTH4L06 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 features low forward voltage drop (0.90 V typ. at 4 A, 150 °C) and platinum-doped construction enabling low leakage current and 175 °C maximum junction temperature - optimized for boost diodes in discontinuous/critical-mode PFC circuits.

For engineers reviewing the STTH4L06 datasheet, STTH4L06 pinout, STTH4L06 application, or STTH4L06 equivalent, key selection criteria include reverse recovery time under high dIF/dt, thermal resistance (20 °C/W junction-to-lead), conduction loss equation (P = 0.92 × IF(AV) + 0.0045 × IF²(RMS)), and DO-201AD mechanical compatibility with high-power freewheeling layouts.

Technical Context

This diode implements ST's Turbo 2 technology, using platinum diffusion to control carrier lifetime and achieve ultrafast switching with low VF trade-off. Its dynamic behavior is characterized by trr = 40–75 ns (depending on dIF/dt and VR), IRM = 3–6.5 A (reverse recovery peak current), and tfr = 130 ns (forward recovery time).

Thermal design relies on Rth(j-l) = 20 °C/W (lead length = 10 mm) and Rth(j-a) = 75 °C/W (free-air), with junction temperature sustained up to 175 °C. The DO-201AD package supports 80 A non-repetitive surge current (tp = 8.3 ms) and meets UL94 V0 flammability rating.

Key Specifications

Pinout & Package

STTH4L06 is housed in a DO-201AD axial-leaded package with cathode band marking. Leads are tinned copper, compliant with ECOPACK® environmental standards and UL94 V0 epoxy.

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, STTH4L06 delivers optimal balance of 4 A current capability, 40–55 ns trr, and DO-201AD manufacturability - making it the preferred choice for mid-power PFC and freewheeling where thermal and surge margins must coexist.

Availability

STTH4L06 is available at Aetrix Electronics and suitable for AC-DC power factor correction, industrial switch-mode power supplies, and telecom rectifier modules requiring stable component supply and long-term lifecycle support.

Supply support for STTH4L06 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STTH4L06 belongs to ST's Turbo 2 ultrafast diode product line, engineered specifically for high-efficiency, high-frequency power conversion topologies where low conduction loss and precise recovery timing are jointly critical.

FAQ

What is the maximum allowable lead length for STTH4L06 to maintain Rth(j-l) ≤ 20 °C/W?

The datasheet specifies Rth(j-l) = 20 °C/W at lead length = 10 mm. Extending leads beyond this increases thermal resistance linearly; for example, 15 mm leads raise Rth(j-l) to ~25 °C/W. Mechanical bending must follow AN1471 guidelines to avoid bond wire damage.

Does STTH4L06 require a heatsink in a 4 A, 100 kHz freewheeling application?

No external heatsink is required if PCB copper area provides Rth(j-a) ≤ 45 °C/W and ambient temperature stays below 70 °C. With DO-201AD's 75 °C/W free-air rating, adequate copper pour (≥4 cm² per lead on 35 µm layer) and airflow >1 m/s ensure Tj remains ≤150 °C.

How does platinum doping affect STTH4L06's reliability versus standard fast recovery diodes?

Platinum doping controls carrier lifetime to achieve consistent trr and low IR across temperature. Unlike gold-doped diodes, it avoids long-term parameter drift and maintains stable VF and trr over 10,000 hours at 150 °C - verified per JEDEC JESD22-A108 stress testing.

Can STTH4L06 replace STTH8L06 in an existing design?

No - STTH8L06 has 8 A IF(AV) and higher IFSM (120 A), requiring larger copper traces and different thermal layout. Substituting STTH4L06 risks thermal runaway above 4.5 A average current or during 8.3 ms surges exceeding 80 A. Derating analysis and thermal imaging are mandatory before replacement.