onsemi FES6D

Overview

FES6D from onsemi is an ultrafast surface-mount rectifier diode rated for 6 A average forward current and 200 V repetitive peak reverse voltage, featuring 1.05 V max forward voltage at 6 A and 25 ns typical reverse recovery time. It uses a TO-277-3L package with DAP option, operates from −55°C to +175°C, and is AEC-Q101 qualified for automotive power conversion.

For engineers reviewing the FES6D datasheet, pinout, applications, or equivalent options, key selection criteria include its low-profile 1.1 mm height, industrial-grade thermal stability up to 150°C junction, ultrafast switching in DC-DC flyback and boost converters, and RoHS-compliant green molding compound.

Technical Context

The FES6D is a single-die, dual-anode common-cathode ultrafast rectifier optimized for high-frequency switching power supplies. Its 25 ns reverse recovery time (measured at IF = 0.5 A, IR = 1 A, IRR = 0.25 A) and 60 pF junction capacitance at 4 V enable efficient operation in 100–500 kHz SMPS topologies.

Thermal design is supported by 6°C/W junction-to-lead resistance and 100°C/W junction-to-ambient rating under JEDEC JESD51-3 conditions. The device maintains stable forward voltage down to 0.90 V at 6 A and 125°C, confirming robust conduction performance across extended temperature ranges.

Key Specifications

Pinout & Package

Package: TO-277-3L (Case 340BQ), 5.91 × 4.44 × 1.10 mm, with DAP (Die Attach Pad) option only. Cathode-side thermal pad enhances heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH6S06 and MBR620CT, the FES6D uniquely combines 200 V rating, 25 ns ultrafast recovery, AEC-Q101 qualification, and surface-mount TO-277-3L packaging-making it optimal for compact, high-frequency, automotive-grade power conversion where thermal and space constraints are critical.

Availability

FES6D is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial switch-mode power supplies, and LED driver secondary rectification requiring stable component supply and long-term lifecycle support.

Supply support for FES6D 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The FES6D belongs to the FES6/NRVFES6 ultrafast rectifier product line, engineered specifically for high-frequency, high-reliability power conversion in automotive and industrial systems demanding AEC-Q101 compliance and low-profile SMT packaging.

FAQ

What is the maximum junction temperature rating for the FES6D?

The FES6D has a maximum operating junction temperature of +175°C and is characterized for stable performance up to +150°C case temperature. Its thermal resistance of 6°C/W (junction-to-lead) allows effective heat transfer to the PCB cathode pad, supporting reliable operation in high-temperature environments such as automotive under-hood applications and industrial power supplies. The FES6D datasheet confirms this rating across all electrical parameters.

Is the FES6D pin-compatible with other devices in the FES6 series?

The FES6D shares identical TO-277-3L package dimensions, pinout, and thermal pad layout with FES6G and FES6J, making them mechanically interchangeable. However, electrical differences exist: FES6D is rated for 200 V VRRM and 1.05 V VF, while FES6G and FES6J offer higher voltage ratings (400 V and 600 V) and higher forward voltage. System-level validation is required before substitution due to these parametric variations. The FES6D datasheet explicitly confirms shared mechanical form factor.

Does the FES6D require a heatsink in standard applications?

The FES6D does not require an external heatsink in most standard applications when mounted on ≥1 oz copper with ≥2 cm² thermal pad area, thanks to its 6°C/W junction-to-lead thermal resistance and low 1.05 V forward voltage. At 6 A average current and 50°C ambient, junction temperature remains below 120°C. For sustained 175°C junction operation or high ambient conditions, additional copper pour or localized thermal vias are recommended. This behavior is verified in the FES6D thermal derating curves.

What does the "NRV" prefix mean in NRVFES6D*?

The "NRV" prefix in NRVFES6D* indicates automotive-grade manufacturing with unique site and process control requirements, full AEC-Q101 qualification, and PPAP capability. While the FES6D and NRVFES6D* share identical electrical and mechanical specifications, the NRV version undergoes additional automotive-specific testing, traceability, and change control. Both part numbers are functionally equivalent, but NRVFES6D* is mandated for automotive production programs requiring certified supply chain controls. This distinction is documented in the onsemi ordering information table.

Can the FES6D be used in synchronous rectification circuits?

The FES6D is a standard ultrafast silicon rectifier-not a MOSFET-based synchronous rectifier-and therefore cannot replace a controlled gate-driven MOSFET in synchronous rectification topologies. It functions as a passive, uncontrolled diode with fixed forward voltage and reverse recovery behavior. While it delivers excellent performance in asynchronous or quasi-resonant converters, true synchronous rectification requires active switching elements. The FES6D datasheet defines it strictly as a rectifier diode with no gate or control terminal functionality.