ESP8266 Community Forum

[RichardS]

- Thu Apr 09, 2015 1:16 pm #14010 If its a 1.5V source, a transistor will eat probably 0.4V of it, you need to use a FET, I use IRLML6401's or 2502's all the time, small SOT23 package and I think 4A current max..... they are a good univeral FET.

Richard.

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- Thu Apr 09, 2015 1:37 pm #14012

If its a 1.5V source, a transistor will eat probably 0.4V of it, you need to use a FET, I use IRLML6401's or 2502's all the time, small SOT23 package and I think 4A current max..... they are a good univeral FET.

Richard.

thank you for response Richard. can i use 1.5v souce with IRLM2502(4.2A) and esp8266. with or without resistor ?

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- Thu Apr 09, 2015 4:04 pm #14033 There is also the AO3402 (also SOT23, 30V/4A) which can be found easily on eBay ...

- Thu Apr 09, 2015 9:24 pm #14048

thank you for response Richard. can i use 1.5v souce with IRLM2502(4.2A) and esp8266. with or without resistor ?

Typically* you don't need a resistor to drive a FET. Unlike BJTs, which amplify a current, FETs change their resistance based on the gate voltage. The gate-source current is negligible (usually in the 100nA range) and does not need to be limited by a resistor.

*) for fast switching rates you might need a pull-down resistor on the gate, to discharge the capacitance of the pins & trace