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Original question:

CSD18503KCS: Replacing Vishay Fets in TIDA-004 Refrencd Design?

CSD18510Q5B: min. Vgsth 1.9V QFN mosfet

Kami Huang60
Genius 3830 points
Part Number: CSD18510Q5B
Other Parts Discussed in Thread: CSD18512Q5B, , CSD18532NQ5B

Dear Sir/Ms.

My customer’s product is an electric power tool. The specification of mosfet is 40V/ Rdon 1mohm 1.3mohm, and the package is QFN5x6.

I introduce him csd18510q5b and csd18512q5b. But he said Vgsth was too low.

He wants Vgsth>1.9V. Does TI have products that meet customer specifications?

Best Regards,

Kami Huang

  • 0
    TI__Mastermind 31995 points

    Hello Kami,

    Thanks for promoting TI FETs at your customer. All of our 40V FETs have threshold voltages specified to approximately the same range and none of them have a 1.9V minimum. We have 60V to 100V FETs with higher minimum threshold voltage but the on resistance is also higher. What is the customer using to drive the gate of the FET? Most gate drivers I am aware of can easily pull VGS < 1V. I'm not quite sure what is the reason for this requirement. Please provide more details about the application.

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    Genius 3830 points

    Hello John,

    My customer uses AM4915 to drive MOSFET, and the input source is 18V or 36V lithium battery. The main reason is that the Motor Driver will cause the mofset to malfunction due to noise when driving the MOSFET.
    Which part numbers do you recommend for 60V/80V Mosfets? I will discuss it with the customer and see what comment the customer has.

    Best Regards,

    Kami Huang

  • 0 in reply to Kami Huang60
    TI__Mastermind 31995 points

    Hi Kami,

    For 60V FET, I would recommend CSD18532NQ5B with minimum Vgs(th) = 2.4V. Max on resistance at VGS = 10V is 3.4mΩ which is higher than the target. This is our lowest on resistance FET with Vgs(th) > 1.9V. This device needs a minimum gate drive voltage, VGS >= 6V and is not compatible with 5V gate drive. I am including a link below to an excel based TI FET selection tool for BLDC applications. The user can enter their requirements and compare up to 3 different TI FET solutions for power loss, price and package.

    https://www.ti.com/tool/MOTOR-DRIVE-FET-LOSS-CALC

    Best Regards,

    John