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Original question:

TCAN1044-Q1: TCAN1044-Q1 terminal resistor

TCAN1044-Q1: TCAN1044-Q1

Karunakaran M
Prodigy 40 points
Part Number: TCAN1044-Q1

Tool/software:

Why 120 ohm is preferred for termination resistor, is there any specific reason or any calculation behind that.

  • +1
    TI__Guru 50496 points

    Hi Kaunakaran, 

    Yes, twisted-pair cables used for CAN are typically rated for 100 to 130 ohms. 120 ohms is the standardized nominal value matching most automotive cable harnesses, further preventing unintended signal reflections. Hence, two parallel 120 ohms at both ends of the bus for an effective impedance of 60 ohms, well within the drive capability of automotive transceivers. For more informations, please see section 9.2.2.1 of the data sheet, thanks.

    Best Regards,

    Michael.