IRFI840BTU

Single FETs, MOSFETs Overview

The IRFI840BTU is an N-channel enhancement mode power MOSFET manufactured by Fairchild Semiconductor. It utilizes planar DMOS technology to achieve low on-state resistance and superior switching performance. The device is rated for a drain-source voltage of 500V and a continuous drain current of 8A at 25°C. Key electrical parameters include a maximum static drain-source on-resistance of 0.85 ohms, a gate charge of approximately 63 nC, and avalanche energy ratings. It operates in an enhancement mode with a threshold voltage typically between 2V and 4V.

Single FETs, MOSFETs Feature Summary

• Planar DMOS technology minimizes on-state resistance while providing high switching speed and efficiency.
• Engineered to withstand high energy pulses in both avalanche and commutation modes.
• Features low gate charge and reduced reverse transfer capacitance for enhanced frequency operation.

Single FETs, MOSFETs Applications

• High-efficiency switch mode power supplies
• Power factor correction circuits
• Electronic lamp ballasts based on half-bridge topologies

Single FETs, MOSFETs Procurement Notes

Verify the specific manufacturer origin, as the IRF840 part number is widely produced by multiple vendors including Vishay and STMicroelectronics. Confirm that the 'BTU' suffix corresponds to the correct tape-and-reel packaging variant if required for automated assembly. Ensure the component meets RoHS compliance standards relevant to your target market before finalizing procurement.

Single FETs, MOSFETs Selection Notes

Select this component for applications requiring robust high-voltage switching capabilities up to 500V. The 8A continuous current rating makes it suitable for moderate power levels where thermal management via a heatsink is feasible. Consider the gate charge specifications when designing drive circuits to ensure efficient switching transitions without excessive driver loss.

Single FETs, MOSFETs Part Context

This component belongs to the IRF840 family of N-channel power MOSFETs, a standard industry designation for 500V devices. While originally associated with International Rectifier, Fairchild Semiconductor produces variants using their proprietary planar DMOS technology. These devices are designed to replace older TMOS generations with improved dv/dt capability and lower parasitic capacitances.

Single FETs, MOSFETs Replacement Considerations

Direct replacements include the IRF840 from other manufacturers such as Vishay or STMicroelectronics. Verify pinout compatibility (Gate, Drain, Source) and package dimensions (TO-220AB) to ensure mechanical fit. Check that the replacement's Rds(on) and Vgs(th) parameters fall within acceptable design margins.