Hi,
I want to build an H-bridge to drive relatively small DC motors (max. 300mA @5V), using a 5V Arduino.
What logic level MOSFETs should I buy for this application?

This is the schematic of the H-bridge:


Thanks in advance,
Pieter

 

You haven't given enough information.

Go to digikey.com or mouser.com and use their parametric search to find something suitable.

 

Check out the Picmicro AN964 or the Mechatronics board schematics, these use SMT devices, unless looking for DIP/discrete parts.
Max.

 

This H bridge is still working well.
Error !! Inverters should be on N ch. as on revised thumbnail.

 

You haven't given enough information.

Go to digikey.com or mouser.com and use their parametric search to find something suitable.

What information do you need?

Check out the Picmicro AN964 or the Mechatronics board schematics, these use SMT devices, unless looking for DIP/discrete parts.
Max.

Yes, I'm looking for discrete parts.

This H bridge is still working well.View attachment 122691

What are the advantages of using this schematic over my original one?

Thank you for your replies,
Pieter

 

Drawing on post #1 is prettier than # 5. Drawing on post # 5 has part nos. available from DigiKey, & has been working for several years lifting a target. Functionally they are the same.

 

You need logic-level type MOSFETS.
In a search, look for MOSFETs that have a Vgs(th) threshold of 2V or less.
Then check that their ON resistance (RDSon) is rated in the data sheet for a Vgs of 5V or less.

 

What information do you need?

MOSFETs come in a number of packages and a variety of prices.

 

I lied, the H bridge is controlling an owl's head for about 4 months, the several years is for servo controlled
by LDR; both posts active at the same time.
The X OR & OR circuit at bottom was for a case where it is possible for both inputs could both be hi or lo at the same time, not good for an H bridge.

 

You need logic-level type MOSFETS.
In a search, look for MOSFETs that have a Vgs(th) threshold of 2V or less.
Then check that their ON resistance (RDSon) is rated in the data sheet for a Vgs of 5V or less.

I understand, I was just wondering if someone had a specific part number, because there's thousands of MOSFETs in the DigiKey or Mouser catalog.

MOSFETs come in a number of packages and a variety of prices.

I'd like discrete through-hole parts that fit in a breadboard. About $1/pc.

The X OR & OR circuit at bottom was for a case where it is possible for both inputs could both be hi or lo at the same time, not good for an H bridge.

If they can't be both high or low at the same time, how do you turn off the motor?

Pieter

 

Hi,
I want to build an H-bridge to drive relatively small DC motors (max. 300mA @5V), using a 5V Arduino.
What logic level MOSFETs should I buy for this application?

This is the schematic of the H-bridge:
View attachment 122686

Thanks in advance,
Pieter

Why fool around with discrete components when you have this available?

 

Thanks for showing up a disastrous error , when redrawing the NAND gates used a invertors were shifted from
the N ch. FETs to the P ch. FETs- not good for the FETs. As it should be, when both inputs are low all FETs are off & same if both inputs are high.