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Thread: My Teensy 4.1 heats too much even when running Blink program. Is it normal?

  1. #1
    Junior Member
    Join Date
    Aug 2021

    My Teensy 4.1 heats too much even when running Blink program. Is it normal?

    This is a new and first Teensy I am using. I just ran the blink program (Uploaded via Teensyduino) and Teensy is quite hot, unlike Arduinos.
    Is this normal?
    In case more information is required, please let me know.

  2. #2
    Senior Member
    Join Date
    Dec 2016
    Montreal, Canada
    are you externally powering it? how is it connected and what is connected to it?

  3. #3
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
    Arduino boards are generally larger and it seems would generally draw less power - and not have to step the 5V down to 3.3V for use creating another heater on the 'Teensy' PCB.

    So somewhat warmer is to be expected with more energy dissipated on a smaller board, where unless attached to a larger breakout board to spread the heat - it remains centralized.

    Last check a Teensy 4.0 running normally takes about 100 mA at 5V - about one third of the 5V goes to heat from the regulator - the rest heats the processor and parts taking power.

    At 600 MHz - versus 16 MHz - the resulting internal processor temp is likely 40 to 50 degrees C and about 100 degrees F is typical processor temp +/- a few depending on ambient air temp with a bare PCB with nothing else using power.

    The T_4.1 has a bit more surface area from a larger PCB - but is similar.

    Without quantitative numbers or knowing what if anything is connected ( even soldered pins help cooling ) it is hard to understand 'quite hot', the notes and numbers above should help for general reference and expectations.

  4. #4
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    It's normal for the chip to warm up when running at 600 MHz. It should be noticeably warm to touch.

    Running at lower speeds reduces the power usage. Click Tools > CPU Speed, then upload again. Even stepping down to only 528 MHz makes a substantial difference.

    Likewise, going to the higher overclocking speeds will make it run even hotter. The highest ones absolutely do require a heatsink to avoid damage.

  5. #5
    Junior Member
    Join Date
    Aug 2021
    Thank you for all the useful information.
    I have only run it using the USB port.

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