Looking for N-channel mosfets with integrated Gate-to-Source pull down resistor  - Page 1
Forum section: electronics / beginners

author: sangar
author_rank: Regular Contributor
timestamp: August 03, 2025, 05:24:04 pm
content: Hi All,I am looking for N-channel MOSFET which should have an integrated Gate-to-Source pull down resistor, to prevent gate floating. The mosfet purpose is for switching applications. I have found one - DMN61D8LQ-7, which is with 100K pull down. Are there any other ?. Please suggest.Thanks,Muthu

author: Terry Bites
author_rank: Super Contributor
timestamp: August 05, 2025, 04:18:13 pm
content: Why integrated and not an external resistor?A protected MOSFET will cost a lot more than adding a tiny SM resistor.

author: CaptDon
author_rank: Super Contributor
timestamp: August 06, 2025, 09:31:32 pm
content: How about searching manufacturer listings or Mouser database? How about some details like Drain/Source breakdown voltage required, Ton/Toff/Trecovery, average current, peak current. Obviously a university project.

author: Siwastaja
author_rank: Super Contributor
timestamp: August 10, 2025, 02:30:04 pm
content: Just use external resistor like everyone else. I have nothing against the idea of integrating the resistor, but such parts are nearly non-existent so greatly limit your choice of a MOSFET.

author: mtwieg
author_rank: Frequent Contributor
timestamp: August 10, 2025, 03:37:58 pm
content: Seems that MOSFETs with internal pulldowns are rare compared to BJTs with internal series/pulldown resistors. On digikey, under "Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors" there are thousands of devices. And Mouser has "Transistors > Digital Transistors" also has thousands of devices but they are all BJTs. No such categories for FETs.If could be that many MOSFETs with internal pulldowns do exist, but they are hard to discover due to how distributors make their databases

author: mariush
author_rank: Super Contributor
timestamp: August 10, 2025, 04:02:13 pm
content: Quote from: sangar on August 03, 2025, 05:24:04 pmThat mosfet is rated for 60v and maximum 470mA.You will find a bigger variety in the "Power Distribution Switches, Load Drivers" section on Digikey:https://www.digikey.com/en/products/filter/power-management-pmic/power-distribution-switches-load-drivers/726You can filter to show only hi-side drivers (which will have chips that use pnp transistors or p-channel mosfets, but also n-channel mosfets) or lo-side drivers (majority using n-channel mosfets or npn transistors)Single channel low side drivers :https://www.digikey.com/short/9fbn9v2jWith 2-4 channels, low side drivers (usually the sources are connected together but not always) :https://www.digikey.com/short/vvz00w2qWith more channels :For example, TPL7407LA , TPL7407L ... 7 channel mosfet array ... array of 7 n-channel mosfets (with the sources joined together), with resistors from gate to source and in series with the gate, and esd protections etc etc Each channel is good for around 500-600mA, you can connect consecutive channels together for higher current, but if all channels are used at same time, the maximum current in total is around 1.2A - 1.4A. To get the high 500mA per channel, the chip needs at least 6.5v on the COM pin (an internal ldo is powered from that), it will work with less than 6.5v but will have much less current per channel.TPL7407 :https://www.digikey.com/short/ppmz5cr0Toshiba TBD62003 50v 500mA per channel, maybe 200-300mA per channel if all channels are used at same time. :https://www.digikey.com/short/p998jqzjULN2003V12 - same as TPL7407, but max 20v per channel and but only 100mA (with 3.3v inputs) or ~130mA (with 5v inputs) per channel, needs no external power :https://www.digikey.com/short/5qz304b1