STMicroelectronics STTH15L06FP

Overview

STTH15L06FP from STMicroelectronics is a 600 V, 15 A ultrafast high-voltage rectifier diode in TO-220FPAC package, optimized for discontinuous-mode PFC boost stages and switching power supply output rectification. It delivers 55 ns reverse recovery time (trr), 0.95 V typical forward voltage (VF) at 150 °C, and 175 °C maximum junction temperature - enabling high-efficiency, thermally robust operation in industrial SMPS.

For engineers reviewing the STTH15L06FP datasheet, STTH15L06FP pinout, STTH15L06FP application, or STTH15L06FP equivalent, key selection criteria include trr ≤ 60 ns at 100 A/µs dIF/dt, Rth(j-c) = 4.0 °C/W, softness factor > 0.8, and compatibility with TO-220FPAC thermal mounting constraints in high-density PFC designs.

Technical Context

The STTH15L06FP employs ST's Turbo 2 silicon technology to achieve ultrafast recovery with low IRM (8.5–12 A) and soft reverse recovery (S factor > 0.8), minimizing EMI and voltage overshoot during turn-off. Its VF vs. IF curve shows strong temperature stability: VF drops from 1.55 V at 25 °C to 0.95 V at 150 °C under 15 A DC.

Dynamic performance is characterized across dIF/dt (50–500 A/µs) and Tj (25–150 °C): trr increases only ~20% from 55 ns to 65 ns over full temperature range, while Qrr remains below 1.6 µC at 400 V VR - critical for predictable loss modeling in high-frequency PFC controllers.

Key Specifications

Pinout & Package

TO-220FPAC package: insulated plastic body with metal tab (cathode), three leads - anode (pin 1), cathode (tab), no third terminal. Mounting via M3 screw (0.4–0.6 N·m torque) to heatsink; tab electrically isolated from leads per 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 STTH15L06FP, STTH15R06DJ trades thermal performance for compactness and eliminates mounting hardware, while IXYS MUR1560CT offers superior Rth(j-c) but demands careful isolation design - making STTH15L06FP optimal for insulated, heatsink-mounted PFC rectification where reliability and ease of assembly are critical.

Availability

STTH15L06FP is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, discontinuous-mode PFC boost stages, and motor drive DC bus rectification requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for STTH15L06FP 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 STTH series targets high-efficiency power conversion systems, with Turbo 2 technology specifically developed to reduce switching losses and improve thermal robustness in 600 V rectifiers for next-generation PFC and SMPS designs.

FAQ

Is STTH15L06FP suitable for synchronous rectification?

No - STTH15L06FP is a unidirectional, passive PN-junction rectifier diode with no gate control or bidirectional conduction capability. It cannot replace MOSFET-based synchronous rectifiers, which require active gate drive and reverse conduction. Its role is strictly limited to hard-switched, unidirectional rectification in boost, flyback, or LLC secondary stages.

What is the maximum recommended dIF/dt for reliable operation?

The datasheet specifies trr and IRM up to 500 A/µs, with IRM remaining ≤12 A and trr ≤85 ns at that rate. For robust design margin, ST recommends limiting dIF/dt to ≤300 A/µs in production systems - verified by Figure 5 and Figure 6 showing stable softness factor (>0.9) and sub-75 ns trr below this threshold.

Can STTH15L06FP be paralleled for higher current capacity?

Yes, but only with matched devices and symmetrical layout: VF's negative temperature coefficient enables natural current sharing, provided thermal coupling is uniform (e.g., shared heatsink with identical mounting pressure). Derate total IF(AV) by 15 % per additional device beyond two, and ensure <2 K inter-device ΔT to avoid thermal runaway.

Does the TO-220FPAC package provide electrical isolation between tab and leads?

Yes - the TO-220FPAC variant features fully insulated epoxy molding, providing 2500 V RMS isolation between the cathode tab and all leads per IEC 60747-5-2. This eliminates need for insulating washers when mounting to grounded heatsinks, simplifying assembly and improving thermal contact consistency.