Need a MOSFET but it seems obsolete, looking for input on a replacement - Page 1
Forum section: electronics / beginners

author: TT_Vert
author_rank: Regular Contributor
timestamp: August 05, 2022, 07:47:05 pm
content: So what i am replacing is a 452AP P channel MOSFET that drives the 12V heater circuit on my wideband for my car. Looking at digikey it seems that particular one is obsolete and the only other ones are higher voltage but lower current. Mouser has nothing until 23! I'm not sure what options i have given my lack of knowledge in interchangeability of these.Any input would be greatly appreciated.ThanksDave

author: kripton2035
author_rank: Super Contributor
timestamp: August 05, 2022, 07:56:48 pm
content: these are some equivalent mosfet. did not check the stock thought...https://alltransistors.com/mosfet/crsearch.php?&struct=MOSFET&polarity=P&pd=3&uds=30&ugsth=2.8&id=5&qg=30&rds=0.065&caps=SOT223

author: wraper
author_rank: Unknown
timestamp: August 05, 2022, 07:57:07 pm
content: You should properly name the component so nobody needs to guess/search what you actually mean. As I understand from your post you know its full part number which seems to be NDT452AP.

author: TT_Vert
author_rank: Regular Contributor
timestamp: August 05, 2022, 11:02:59 pm
content: Quote from: wraper on August 05, 2022, 07:57:07 pmSorry i thought giving the PN and that i was a Pchannel mosfet was enough. It's a SOT-223 as well. I'm not sure I know any more details than this though.

author: TT_Vert
author_rank: Regular Contributor
timestamp: August 05, 2022, 11:03:37 pm
content: Quote from: wraper on August 05, 2022, 07:57:07 pmThanks much, mind telling me how you found that equivalency chart? I googled 452AP equivalents an came up w/ nothing. The marking on the component is what I posted as I am unsure if the letters in front of it are specific to a particular manufacturer or not.**UPDATE**, i found the site, that's very handy thank you.https://alltransistors.com/Dave

author: thm_w
author_rank: Super Contributor
timestamp: August 05, 2022, 11:18:55 pm
content: Here are the specs that matter, for you:- Imax -5A,- Vds max -30V.- Vgs max 20V- RDS(ON) = 0.065 Ω @ VGS = -10V- SOT-223-4 packageOn digikey there is one part that I saw that meets the requirement, only 1 part availablehttps://www.digikey.ca/en/products/detail/panjit-international-inc/PJW5P06A-R2-00001/15802040So either get that and some other close parts or find another supplier.We don't know the circuit so a lower current option cant be guaranteed to work.

author: TT_Vert
author_rank: Regular Contributor
timestamp: August 06, 2022, 03:26:53 pm
content: Quote from: thm_w on August 05, 2022, 11:18:55 pmI was just coming back to ask about that part #. Where do i find VDS? I did find VDSS but not VDS. Would any VDS rating HIGHER than or equal to what i have now be ok, sort of like wattage on a resistor or voltage of a cap?The only differences between what I have and that is the VGSS is different, 30V for mine vs 60V for this (Which seems is just a max short circuit voltage from my research?) and Gate Charge (Qg) (Max) @ Vgs is a bit different 2.8V on my component vs. 2.5V.Basically this MOSFET just drives a 3 Ohm heater coil for a heated oxygen sensor. That's about all i know about this circuitUnfortunately this is a moot point as when I click on it to buy it it says there are 0Dave

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 06, 2022, 07:26:21 pm
content: Taiwanese company VBSemi makes an almost exact clone of the part you're looking for: seeNDT452AP-NL datasheet. It's currently in stock atLCSC.I say almost exact, because some of the characteristics differ, but actually in a beneficial way because they're better than the On Semi original - for example, -35V VDSvs. -30V, -1.8V max VGS(th)vs -2.8V, 0.050 RDS(on)vs. 0.065.There are usually a variety of far-eastern brands that make clones or functional equivalents of western-brand parts, with similar (or same) part numbers. They'll frequently just substitute the alphabetic prefix of the part number with their own - e.g. 'NDT452AP' might become 'XYZ452AP'.

author: kripton2035
author_rank: Super Contributor
timestamp: August 06, 2022, 07:32:06 pm
content: aliexpress has some in stockhttps://fr.aliexpress.com/item/32284291606.htmlcan be new old stock. worth the try if there is nothing available elsewhere.and you will have a refund if you claim it's not the right component

author: thm_w
author_rank: Super Contributor
timestamp: August 08, 2022, 11:07:50 pm
content: Quote from: TT_Vert on August 06, 2022, 03:26:53 pmHigher is OK.Yes same as wattage of resistor of voltage of capacitor.3 ohm heater coil is about 4A at 12V, so its being run quite hard, although it may not be on 100%.