STMicroelectronics STTH3L06U

Overview

STTH3L06U from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in SMB package, rated for 600 V repetitive peak reverse voltage, 3 A average forward current, and 60 ns typical reverse recovery time. It uses platinum-doped Turbo 2 technology to achieve low leakage (100 µA max at 150 °C) and low forward voltage (0.85 V typ at 150 °C), optimized for boost diodes in discontinuous/critical-mode PFC circuits.

For engineers reviewing the STTH3L06U datasheet, STTH3L06U pinout, STTH3L06U application, or STTH3L06U equivalent, key selection factors include its soft recovery behavior (S-factor >1.0), low thermal resistance (25 °C/W junction-to-lead), and SMB footprint compatibility with space-constrained AC/DC front-end designs.

Technical Context

This device implements a planar passivated silicon PN junction with platinum diffusion for controlled minority-carrier lifetime, enabling ultrafast switching with soft reverse recovery (typical S-factor >1.0 at 125 °C). Its dynamic performance is characterized under standardized conditions: trr measured at IF = 1 A, dIF/dt = −50 A/µs, VR = 30 V.

The thermal design relies on low Rth(j-l) = 25 °C/W (SMB), supporting continuous operation up to Tj = 175 °C. Conduction loss modeling uses P = 0.89 × IF(AV) + 0.055 × IF²(RMS), reflecting its nonlinear VF vs. current and temperature dependence.

Key Specifications

Pinout & Package

The STTH3L06U is housed in an SMB (DO-214AA) surface-mount package with cathode band marking. Lead finish is matte tin, RoHS-compliant and ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR360 and VS-3EY60, STTH3L06U delivers the lowest VF (0.85 V) at elevated temperature and tightest trr (60 ns) in SMB form factor-making it optimal for thermally constrained, high-frequency PFC designs where efficiency and layout density are critical.

Availability

STTH3L06U is available at Aetrix Electronics and suitable for AC/DC power factor correction, industrial switch-mode power supplies, LED driver front-end rectification, and telecom power shelf rectifiers requiring stable component supply and long-term industrial lifecycle support.

Supply support for STTH3L06U 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.

The STTH series belongs to ST's Turbo 2 ultrafast rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion topologies including CrM/DCM PFC, server PSUs, and telecom rectifiers.

FAQ

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

The STTH3L06U has a maximum junction temperature of 175 °C. Operating consistently near this limit accelerates parametric drift and reduces long-term reliability; however, its platinum-doped junction maintains stable IR (<100 µA) and VF (<1.05 V) up to 150 °C, enabling robust performance in sealed industrial enclosures with limited airflow.

Is the STTH3L06U suitable for use in synchronous rectification circuits?

No-STTH3L06U is a unidirectional silicon PN rectifier, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively turned off. It serves only as a passive freewheeling or boost diode; synchronous rectification requires a logic-level N-channel MOSFET with external gate drive.

How does the SMB package compare thermally to DO-201AD and SMC variants?

The SMB package has Rth(j-l) = 25 °C/W, matching the SMC variant and better than DO-201AD (20 °C/W but with higher Rth(j-a) = 75 °C/W). While DO-201AD offers superior absolute thermal resistance, SMB provides optimal balance of low profile, automated assembly compatibility, and sufficient thermal performance for ≤3 A continuous operation on standard FR4 with 2 oz copper.

Does STTH3L06U require snubber circuitry in typical PFC applications?

Snubbers are generally not required due to its soft reverse recovery (S-factor >1.0) and low stored charge (QRR ≈ 25 nC typ). However, in high-dIF/dt (>100 A/µs) or high-VF transient conditions, a small RC snubber across the diode may further reduce ringing-verified via oscilloscope measurement of VAK waveform at the actual operating point.