STMicroelectronics STTH20LCD06CFP

Overview

STTH20LCD06CFP from STMicroelectronics is a dual ultrafast high-voltage silicon rectifier diode in TO-220FPAB package, rated for 600 V repetitive peak reverse voltage, 20 A total average forward current (10 A per diode), and 50 ns maximum reverse recovery time at 125 °C. It employs Turbo2 technology to minimize conduction and switching losses in interleaved PFC stages of high-efficiency SMPS.

For engineers reviewing the STTH20LCD06CFP datasheet, STTH20LCD06CFP pinout, STTH20LCD06CFP application, or STTH20LCD06CFP equivalent, key selection criteria include thermal resistance (5.8 °C/W junction-to-case), low reverse leakage (<100 µA at 150 °C), soft recovery behavior (SFACTOR >3.5), and compatibility with high-dIF/dt conditions (>400 A/µs) in hard-switched topologies.

Technical Context

This dual common-cathode diode integrates two independent ultrafast rectifying elements sharing a single cathode terminal, enabling synchronous operation in interleaved boost PFC converters. Its Turbo2 process delivers low VF (1.25 V typ. at 10 A, 150 °C) and tightly controlled trr (25–50 ns) across temperature and dIF/dt.

The TO-220FPAB package provides insulated mounting via plastic body while maintaining low thermal resistance (5.8 °C/W j-c), supporting direct heatsink attachment without isolation washers. Dynamic parameters-including QRR (≤550 nC), IRM (≤2.8 A), and tfr (230 ns)-are characterized under realistic SMPS operating conditions (VR = 400 V, Tj = 125 °C).

Key Specifications

Pinout & Package

TO-220FPAB package features electrically insulated tab (plastic body), three leads, and screw-mount capability. Thermal path is optimized for conduction cooling via heatsink contact on the molded back surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH20LCD06CFP, STTH20L06CG-TR offers superior thermal performance but demands additional isolation, while MUR2060CT trades efficiency and EMI robustness for broader distributor availability and lower unit cost in legacy designs.

Availability

STTH20LCD06CFP is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC front-ends, and telecom rectifier modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for STTH20LCD06CFP 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.

This device belongs to ST's Turbo2 ultrafast diode product line, engineered specifically for high-efficiency, high-frequency switching power supplies-especially interleaved PFC stages where low QRR, soft recovery, and thermal robustness are critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH20LCD06CFP has a maximum junction temperature of 175 °C. With a junction-to-case thermal resistance of 5.8 °C/W and typical power dissipation of 25 W at full load, the case temperature must remain below 160.5 °C to maintain safe margin. This requires a heatsink with thermal resistance ≤3.0 °C/W when ambient is 50 °C.

Can this diode be used in non-interleaved PFC topologies?

Yes-it functions reliably in single-phase CCM boost PFC, but its dual-anode structure offers no benefit there. In such cases, a single-diode alternative like STTH12S06D may provide better cost and board-area efficiency, unless future design migration to interleaving is planned.

Is the TO-220FPAB package electrically insulated?

Yes-the TO-220FPAB variant uses a fully plastic-molded body that insulates the metal tab from all internal terminals. This eliminates the need for mica washers or silicone pads when mounting directly to grounded heatsinks, simplifying mechanical assembly and improving thermal interface consistency.

How does the soft recovery characteristic affect EMI filter design?

The SFACTOR >3.5 ensures gradual current decay during reverse recovery, reducing high-frequency spectral content above 30 MHz. This lowers differential-mode noise amplitude by ~10–15 dB compared to standard fast diodes, allowing smaller X-capacitors and fewer common-mode chokes in EN 55022-compliant filter designs.