STMicroelectronics STTH1L06

Overview

STTH1L06 from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode optimized for boost-stage PFC in discontinuous or critical conduction mode, with 600 V V_RRM, 1 A I_F(AV), 80 ns max t_rr, 1.05 V max V_F at 150 °C, and DO-41 package. It serves as a free-wheeling diode in SMPS and industrial switching power supplies.

For engineers reviewing the STTH1L06 datasheet, STTH1L06 pinout, STTH1L06 application, or STTH1L06 equivalent, key selection criteria include reverse recovery time under high dI/dt, thermal resistance (R_th(j-l) = 45 °C/W), softness factor, conduction loss equation (P = 0.89×I_F(AV) + 0.165×I_F(RMS)²), and junction temperature derating up to 175 °C.

Technical Context

This diode employs ST's Turbo 2 technology to achieve ultrafast recovery with low I_RM and soft reverse recovery characteristics-critical for minimizing EMI and voltage overshoot in high-frequency PFC stages. Its low R_th(j-l) (45 °C/W) and high T_j(max) (175 °C) support reliable operation under thermally constrained conditions.

Dynamic performance is characterized at 25 °C and 150 °C with controlled dI/dt (−50 A/µs) and VR = 30 V, delivering typ. 55 ns t_rr and <2.0 softness factor. Forward recovery voltage (V_FP) remains ≤10 V at 100 A/µs, enabling stable turn-on in synchronous or snubberless topologies.

Key Specifications

Pinout & Package

STTH1L06 is housed in a DO-41 axial-leaded plastic package (UL 94 V0 compliant), with cathode indicated by a band on the body. Leads are 10 mm long per JEDEC standard; bending must follow AN1471 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06 and VS-1EWH06-M3, STTH1L06 uniquely balances ultrafast recovery (≤80 ns), low V_F (≤1.05 V), and low thermal resistance (45 °C/W), making it optimal for thermally constrained, high-frequency PFC where both switching and conduction losses must be minimized simultaneously.

Availability

STTH1L06 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial SMPS, LED drivers, and PFC boost converters requiring stable component supply, RoHS-compliant packaging, and consistent parametric performance across production lots.

Supply support for STTH1L06 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STTH1L06 belongs to ST's Turbo 2 ultrafast diode product line, engineered specifically for high-efficiency, high-frequency power conversion in PFC and SMPS applications where low recovery charge and soft switching are essential.

FAQ

What is the maximum junction temperature and how does it affect derating?

The STTH1L06 has a maximum junction temperature (T_j(max)) of 175 °C. At T_c = 120 °C, its I_F(AV) is rated at 1 A; above this case temperature, current must be linearly derated to zero at 175 °C. This enables operation in sealed enclosures or high-ambient environments where thermal management is limited.

How does the softness factor impact circuit reliability?

The STTH1L06 exhibits a typical softness factor (S) < 2.0, meaning its reverse recovery current declines gradually rather than abruptly. This reduces voltage overshoot across the switching FET and minimizes high-frequency ringing-lowering EMI emissions and preventing false triggering of overvoltage protection circuits in PFC controllers.

Can STTH1L06 replace a standard FR1 diode in existing designs?

Yes-STTH1L06 is a direct drop-in replacement for FR1-series 600 V diodes in DO-41 packages, offering identical pinout and footprint. However, its lower t_rr (80 ns vs. ~250 ns) and softer recovery may require minor snubber tuning to optimize EMI and voltage stress, especially in high-dI/dt layouts.

What is the significance of the conduction loss equation P = 0.89×I_F(AV) + 0.165×I_F(RMS)²?

This empirically derived equation models total conduction loss under real-world operating conditions-including both DC and RMS current components. It accounts for non-linear V_F behavior and enables accurate thermal prediction in discontinuous or critical conduction mode PFC, where I_F(RMS) can exceed I_F(AV) by 2–3×.