| Electronics > Beginners |
| Low voltage drop transistor (or other device) |
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| permal:
Hi, Besides transistors, what other devices are available to turn power on/off to other devices? I'm in need of something with a voltage drop lower than 0.5V at ~100mA, 3.3V A relay would have near 0V drop, at the cost of space and increased power draw. Anything integrated available? |
| Benta:
I'd use a DIP or SIP reed relay. Simple and efficient. That being said, 0.1 V drop over a bipolar transistor is normal, on a MOSFET it depends on the on-resistance. |
| tsman:
Why don't you want a transistor? --- Quote from: permal on December 02, 2018, 06:06:02 pm ---increased power draw. --- End quote --- You can get latching relays which just need a pulse to toggle. |
| janoc:
--- Quote from: permal on December 02, 2018, 06:06:02 pm ---A relay would have near 0V drop, at the cost of space and increased power draw. Anything integrated available? --- End quote --- Even chips use transistor (whether BJTs or MOSFETs) inside. A low voltage logic level MOSFET could work, there you have Rdson down in tens of milliohms if you pick the right part. So the voltage drop at 100mA would be in millivolts. |
| Zero999:
What voltage does this have to switch? 4V, 400V? Plenty of cheap transistors can do this, see data sheets linked below: https://www.onsemi.com/pub/Collateral/BC337-D.PDF https://cdn.sparkfun.com/datasheets/BreakoutBoards/BSS138.pdf |
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