FMF400HX-12A
High-quality sic mosfets component designed for reliable performance in industrial and commercial applications.
Product Overview
Description
This sic mosfets product offers excellent performance characteristics for various applications.
Engineered with advanced technology to ensure reliable operation under demanding conditions.
Suitable for industrial, automotive, and consumer electronics applications.
Product Series
Discrete SiC
Primary Application
Server power
Key Features
- 650V SiC MOSFET technology
- Low Rds(on) = 40mΩ at 25°C
- Fast switching with low Coss
- TO-247-4 package with Kelvin source
- High dv/dt ruggedness
- 175°C maximum junction temperature
Specifications
Applications
Server power
Electronic system design
Telecom rectifiers
Electronic system design
Data center PSU
Electronic system design
LED drivers
Motor drive and control systems
FAE Expert Insights
"Based on extensive field experience, this product delivers excellent performance across various operating conditions. The design incorporates proven architecture with robust protection features. Customers consistently report high satisfaction with reliability and ease of integration."
Industrial grade, high reliability
— Senior FAE, BeiLuo
Frequently Asked Questions
What makes FMF400HX-12A suitable for server power supplies?
Server power advantages of FMF400HX-12A: (1) Efficiency - enables 80Plus Titanium (96%+) efficiency. (2) Power density - high frequency reduces magnetic size for dense designs. (3) Reliability - SiC robustness for 24/7 operation. (4) Thermal performance - lower losses reduce cooling requirements. (5) Size - compact designs for 1U/2U server form factors. (6) Cost savings - reduced cooling and smaller magnetics offset device cost. (7) Hold-up time - higher efficiency extends hold-up time. The 650V rating is perfect for 380V AC server power applications.
Use for high-efficiency server PSU; enables 80Plus Titanium certification.
How does SiC improve PFC stage efficiency?
SiC PFC efficiency improvements: (1) No reverse recovery - eliminates diode switching losses. (2) Lower switching losses - 70% reduction at high frequency. (3) Higher frequency - 100kHz vs 50kHz reduces inductor size. (4) Continuous conduction mode - CCM PFC with SiC has better efficiency than CrM with silicon. (5) Boost diode - SiC Schottky has zero reverse recovery. (6) Bridgeless PFC - SiC enables efficient bridgeless topologies. (7) Overall PFC efficiency - 99%+ vs 97% for silicon. The FMF400HX-12A enables highest efficiency PFC designs.
Use SiC for CCM PFC above 50kHz; pair with SiC Schottky diode for best results.
What is the Rds(on) temperature coefficient of SiC MOSFETs?
SiC Rds(on) temperature characteristics: (1) Positive temperature coefficient - Rds(on) increases with temperature. (2) Temp coefficient - approximately 1.3x from 25°C to 150°C. (3) Comparison - lower than silicon MOSFETs (1.5-2x), higher than IGBTs (flat). (4) Parallel operation - positive TC enables natural current sharing. (5) Thermal runaway - less risk than silicon due to moderate TC. (6) Design consideration - size for hot Rds(on) at maximum junction. (7) Measurement - verify actual Rds(on) at operating temperature. The moderate positive TC of SiC simplifies parallel operation.
Size for 150°C Rds(on); parallel operation benefits from positive temperature coefficient.
Can FMF400HX-12A be used for totem-pole PFC?
Yes, FMF400HX-12A is ideal for totem-pole PFC: (1) Fast switching - essential for hard-switched totem-pole topology. (2) Bidirectional conduction - MOSFET conducts in both directions. (3) Body diode - can be used for slow leg (though external diode recommended). (4) Efficiency - totem-pole with SiC achieves 99% efficiency. (5) Bridgeless - eliminates diode bridge losses. (6) Frequency - 65kHz+ operation for compact magnetics. (7) Control - compatible with standard PFC controllers. The totem-pole PFC is the ideal application for 650V SiC MOSFETs.
Excellent for totem-pole PFC; use two devices in bridgeless configuration.
What thermal management is required for FMF400HX-12A?
Thermal management for FMF400HX-12A: (1) Lower losses - SiC efficiency reduces thermal management vs silicon. (2) Rth(j-c) - 0.5°C/W typical for TO-247-4. (3) Heatsink sizing - calculate based on actual losses (typically 50% less than IGBT). (4) Thermal interface - quality TIM essential for good heat transfer. (5) Airflow - natural convection often sufficient for <500W designs. (6) Temperature monitoring - NTC or direct Tj measurement recommended. (7) Derating - design for Tj < 150°C for long life. SiC's higher efficiency often simplifies thermal design compared to silicon alternatives.
Calculate based on actual SiC losses; often simpler cooling than equivalent IGBT.
How do SiC MOSFETs behave during short-circuit conditions?
SiC short-circuit behavior: (1) Saturation current - SiC has higher saturation current than IGBTs. (2) Withstand time - typically 2-5μs at rated voltage. (3) Desaturation detection - essential protection method. (4) Soft turn-off - prevent overvoltage during fault clearance. (5) Ruggedness - SiC is robust but shorter SCWT than IGBTs. (6) Protection speed - require faster protection circuits (<2μs). (7) Testing - verify short-circuit protection under all conditions. The FMF400HX-12A requires fast-acting protection but is robust when properly protected.
Implement fast desaturation protection (<2μs); use soft turn-off for fault clearance.