STMicroelectronics STTH1L06U

Overview

STTH1L06U from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in SMA package, rated for 600 V repetitive peak reverse voltage, 1 A average forward current, and 80 ns maximum reverse recovery time. It serves as a boost diode in discontinuous/critical-mode PFC circuits and as a freewheeling diode in switch-mode power supplies.

For engineers reviewing the STTH1L06U datasheet, STTH1L06U pinout, STTH1L06U application, or STTH1L06U equivalent, key selection criteria include its low trr (55–80 ns), low VF (0.85–1.05 V at 150 °C), 75 µA max IR at 150 °C, 25 °C/W junction-to-lead thermal resistance, and SMA surface-mount compatibility for compact high-frequency power conversion designs.

Technical Context

This device employs ST's Turbo 2 600 V technology to achieve ultrafast switching with soft recovery characteristics-evidenced by a typical softness factor >1.0 across dIF/dt up to 50 A/µs. Its low reverse recovery current minimizes switching losses in high-frequency PFC stages.

The diode operates up to 175 °C junction temperature and exhibits low thermal resistance (Rth(j-l) = 30 °C/W for SMA), enabling reliable conduction at 1 A average current with minimal heatsinking. Dynamic parameters-including tfr ≤50 ns and VFP ≤10 V-are specified under controlled dIF/dt and VR conditions for predictable behavior in hard-switched topologies.

Key Specifications

Pinout & Package

SMA (DO-214AC) package: cathode indicated by band; leads are solderable on standard FR4 PCB with 3.95–4.60 mm E1 dimension and 2.25–2.90 mm D width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1L06U, STTH1R06U offers higher current headroom without changing board layout, while VS-1EWH06-M3 provides second-source availability at the cost of 0.1 V higher VF and 5 °C/W higher thermal resistance-impacting thermal design margin in space-constrained applications.

Availability

STTH1L06U is available at Aetrix Electronics and suitable for server power supply PFC stages, industrial AC/DC adapters, and telecom DC/DC module input rectification requiring stable component supply and consistent SMA package sourcing.

Supply support for STTH1L06U 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.

The STTHxL06 series 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 trr, low VF, and robust thermal performance.

FAQ

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

The STTH1L06U has a maximum junction temperature (Tj) of 175 °C. Operating continuously near this limit accelerates parametric drift and reduces long-term reliability; derating to ≤150 °C junction temperature is recommended for >10-year field life in industrial applications. Thermal design must ensure Rth(j-l) × Ploss + Tambient stays within this limit.

Can STTH1L06U replace a standard fast recovery diode in an existing 65 kHz flyback design?

Yes-STTH1L06U can directly replace standard fast recovery diodes (e.g., UF4007) in flyback freewheeling positions. Its 80 ns trr versus ~500 ns for UF4007 reduces switching loss by ~70%, lowers EMI filter requirements, and improves efficiency by 0.8–1.2% at full load, provided PCB layout accommodates SMA footprint and thermal copper area.

Is the SMA package lead-free and RoHS-compliant?

Yes, the STTH1L06U is manufactured in an ECOPACK®-compliant SMA package meeting RoHS Directive 2011/65/EU and halogen-free requirements. The device carries the "ECOPACK2" marking per ST's environmental compliance documentation, with lead finish qualified for Pb-free reflow profiles (JEDEC J-STD-020D).

How does reverse recovery charge (Qrr) impact EMI in PFC circuits?

Qrr directly influences high-frequency current spikes during diode turn-off; STTH1L06U's Qrr is typically 25–45 nC (at dIF/dt = 50 A/µs, VR = 400 V), significantly lower than standard fast diodes (~100–200 nC). This reduces dv/dt-induced noise and common-mode EMI, easing compliance with EN55022 Class B limits without additional snubbing.