# Can MOSFET(BSS138) able to switch 5v 1a (DC) load? [closed]

I have one simple question about the MOSFET. Can N-Channel MOSFET(BSS138) able to switch the (DC) 5V 1A load/line ? (Input to mosfet will be the 3.3V from MCU).

Below is the image of connections. Here LV,LV1 will be controlled by the microcontroller. (LV = 3.3V,LV1 = 3.3V,HV = 5V, so when LV1 = 0V then on HV1 we will get 0V and if we apply 3.3V to LV1 then HV1 will be the 5V but I am not sure that BSS138 can tolerate the 1A on HV line)

But I have the question for the HV line. I am sure that 5V on HV can be tolerated by the BSS138 but can it tolerate 1A current on HV line ?

simulate this circuit – Schematic created using CircuitLab

• Nope, read the datasheet, continous Id (Drain Current) = 0.22 A which is too low for 1 A. Explain why you could not have figured this out yourself. – Bimpelrekkie Dec 11 '17 at 11:16
• Hi @Bimpelrekkie thanks for your comment. I couldn't because I am not sure about the electronics behind MOSFET. – Bhautik R. Dec 11 '17 at 11:29
• We are not here to read the datasheet to you. – Olin Lathrop Dec 11 '17 at 11:42
• This is a logic level shifter. I am wondering why you have 1A on it. Looks like an X-Y problem to me. – Trevor_G Dec 11 '17 at 12:41
• (1) The unit symbols for Volt and Ampere are 'V' and 'A', not 'v' and 'a'. (2) Current is not on a line; it goes through a line. (3) You are asking about a current of 1A "on" (through) the HV line. Note that there is a 10kOhm resistor in series. 1A going through that line would mean that there are 10kV across this resistor and a power dissipation of 1kW. – Curd Dec 11 '17 at 13:44