STMicroelectronics STTH3BCF060U

Overview

STTH3BCF060U from STMicroelectronics is a 600 V, 3 A average forward current high-voltage P-N rectifier diode optimized for freewheel operation in BC2 topology continuous conduction mode (CCM) power factor correction circuits. It delivers low conduction losses (VF = 1.7 V @ 25 °C, 3 A), ultrafast reverse recovery (trr = 35 ns), and junction temperature up to 175 °C, enabling efficiency gains of up to 2.5% over standard ultrafast PN diodes in 200–300 kHz PFC stages up to 400 W.

For engineers reviewing the STTH3BCF060U datasheet, STTH3BCF060U pinout, STTH3BCF060U application, or STTH3BCF060U equivalent, this diode's BC2-specific soft-recovery behavior, thermal resistance (Rth(j-l) = 25 °C/W), and compatibility with standard PFC controllers are critical selection criteria in high-efficiency AC-DC front-end design.

Technical Context

The STTH3BCF060U implements a patented P-N junction structure engineered exclusively for the BC2 (Back Current Circuit) topology, where two auxiliary windings recover reverse recovery energy and damping current-eliminating hard switching at turn-on. Its dynamic performance is characterized by softness factor >1.0 and low Qrr, minimizing EMI and voltage overshoot during dIF/dt transients up to 500 A/µs.

This diode operates in CCM PFC with fixed-frequency control (up to 300 kHz), supports 400 W output, and interfaces directly with boost MOSFETs and bulk capacitors without gate drive or feedback circuitry. Its 600 V VRRM rating and 100 µA IR (max) at 150 °C ensure robust blocking under transient line surges and elevated ambient conditions.

Key Specifications

Pinout & Package

The STTH3BCF060U is housed in an SMB (DO-214AA) surface-mount package with gull-wing leads, UL94 V0 epoxy, and lead-free finish. Package dimensions: 3.95 × 5.60 × 2.45 mm (L × W × H), footprint per Figure 14.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L06 and STTH8BC065, the STTH3BCF060U uniquely combines BC2-specific soft recovery, SMB footprint, and 3 A rating - making it irreplaceable for space-constrained, high-efficiency BC2 PFC where both thermal density and dynamic performance are critical.

Availability

STTH3BCF060U is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, telecom rectifier modules, and medical-grade AC-DC converters requiring stable component supply and long lifecycle support.

Supply support for STTH3BCF060U 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 STTH3BCF060U belongs to ST's high-voltage rectifier product line, engineered specifically for next-generation CCM PFC topologies like BC2 - targeting 80+ Titanium/Platinum efficiency compliance in compact, thermally constrained AC-DC systems.

FAQ

What is the BC2 topology, and why is STTH3BCF060U essential to it?

The BC2 (Back Current Circuit) topology is an ST-patented PFC architecture that uses coupled auxiliary windings to recover reverse recovery energy and suppress turn-on losses. STTH3BCF060U is uniquely optimized for this role - its soft recovery (S >1.0), low trr (35 ns), and P-N junction structure enable zero-current switching in the freewheel path, which standard diodes cannot replicate without external snubbers or topology changes.

Can STTH3BCF060U replace standard 600 V ultrafast diodes in existing PFC designs?

Yes, it can be substituted in pin-compatible SMB layouts, but full BC2 benefits require matching auxiliary windings and controller timing. Without BC2 circuitry, it still improves efficiency by ~1.2% over generic ultrafast diodes due to lower VF and trr - however, soft recovery advantages remain unrealized unless the full topology is implemented per ST Application Note AN4217.

What thermal design guidance applies to STTH3BCF060U in SMB package?

With Rth(j-l) = 25 °C/W and no heatsink, STTH3BCF060U requires ≥1 cm² of 35 µm Cu on the PCB's component side, connected directly to both leads. For 3 A average current at 55 °C ambient, junction temperature stays ≤125 °C. Adding thermal vias to inner ground planes further reduces Rth(j-a) - ST recommends verifying with IR thermography under full-load, 300 kHz operation.

How does STTH3BCF060U compare to Schottky diodes in 600 V PFC applications?

Schottky diodes are unavailable at 600 V rating; STTH3BCF060U fills this gap with P-N technology while outperforming lower-voltage Schottkys in CCM PFC. At 200 kHz, it improves efficiency by 0.5% versus 600 V-class SiC Schottkys (where available), due to lower Qrr and absence of reverse recovery charge - confirmed in ST's bench testing per Doc ID 17524 Rev 2, Figure 6.