STMicroelectronics STTH5R06FP

Overview

STTH5R06FP from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in insulated TO-220FPAC package, rated for 600 V repetitive peak reverse voltage and 5 A average forward current at TC = 135 °C. It delivers 25 ns maximum reverse recovery time, 1.40 V typical forward voltage at 125 °C, and 5.5 °C/W junction-to-case thermal resistance - optimized for continuous-conduction-mode PFC boost stages and hard-switching freewheeling applications in industrial AC/DC power supplies.

For engineers reviewing the STTH5R06FP datasheet, STTH5R06FP pinout, STTH5R06FP application, or STTH5R06FP equivalent, key selection criteria include reverse recovery performance under high dIF/dt (≤200 A/µs), softness factor (≥0.35), conduction loss modeling (P = 1.164×IF(AV) + 0.128×IF²(RMS)), insulation rating (2000 VRMS), and thermal interface requirements for heatsink mounting.

Technical Context

This device implements ST's Turbo 2 600 V process, enabling ultrafast switching with low Qrr (110 nC) and controlled IRM (5.0–6.0 A) under harsh dIF/dt conditions (−200 A/µs). Its soft recovery behavior minimizes EMI generation during turn-off in high-frequency switching topologies.

The TO-220FPAC package provides reinforced electrical isolation (2000 VRMS) between the cathode tab and leads, allowing direct heatsink mounting without insulating washers. Thermal design must account for Rth(j-c) = 5.5 °C/W and recommended torque of 0.55 N·m for mechanical reliability.

Key Specifications

Pinout & Package

TO-220FPAC is an insulated variant of TO-220 with electrically isolated metal tab (cathode), enabling direct heatsink attachment without thermal pad or insulator. The package features three leads: Anode (pin 1), Cathode (pin 2), and isolated tab (cathode, electrically connected to pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D and IXYS MUR560E, STTH5R06FP uniquely combines 5 A rating with reinforced insulation, 25 ns trr, and soft recovery-making it optimal for space-constrained, high-efficiency, isolated PFC and clamping applications where thermal and EMI constraints are critical.

Availability

STTH5R06FP is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server/telecom rectification, and motor drive DC bus clamping requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STTH5R06FP 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.

STTH5R06FP belongs to ST's Turbo 2 ultrafast rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in CCM PFC, freewheeling, and clamping roles across industrial and telecom infrastructure.

FAQ

What is the maximum allowable junction temperature for STTH5R06FP?

The absolute maximum operating junction temperature is 175 °C, as specified in Table 2 of the official datasheet (DocID7976 Rev 12). This rating enables reliable operation in high-ambient environments such as enclosed industrial power cabinets, provided thermal design maintains Tj ≤ 175 °C using the 5.5 °C/W Rth(j-c) value and appropriate heatsink sizing.

Does STTH5R06FP require an insulating pad when mounted to a heatsink?

No - the TO-220FPAC package integrates reinforced electrical isolation (2000 VRMS) between the cathode tab and all leads, permitting direct metal-to-metal contact with grounded heatsinks. No mica or silicone pad is needed, reducing thermal resistance and assembly complexity while maintaining safety compliance.

How does the softness factor affect circuit performance?

The softness factor (S ≥ 0.35) quantifies the ratio of time for reverse current to decay to 25% vs. 90% of peak value. A higher S factor ensures slower, more controlled current decay during turn-off, suppressing voltage overshoot and high-frequency ringing - critical for reducing EMI in densely packed power stages and avoiding false triggering of overvoltage protection.

Can STTH5R06FP replace standard fast recovery diodes in existing designs?

Yes, if the original design uses a TO-220FPAC-packaged 600 V diode with ≤5 A IF(AV) and requires improved trr (<30 ns) and soft recovery. Verify layout clearance for the insulated tab, confirm thermal interface compatibility, and re-evaluate snubber sizing due to lower Qrr (110 nC) and reduced turn-off loss - which may allow snubber reduction or elimination.