Unkown smd part D14JL - Page 1
Forum section: electronics / repair

author: neo2000
author_rank: Newbie
timestamp: June 14, 2024, 04:55:58 pm
content: Hello, I need help identifying 2 blown parts from a Li-Ion battery charger. It has slots for 8 batteries charging up to 2A. I removed the blown parts in the picture already, but they are ale the same on this side of the pcb. It's a sot-23 housing with the label D14JL as they are used to drive the coil, they might be mosfets, but the internet gave no hint. I would be pleased if someone has any glue with part this could be.Thanks in advance. Regards Timo

author: wraper
author_rank: Unknown
timestamp: June 14, 2024, 05:14:57 pm
content: Could be Si2321DS. D1 device code and total number of symbols do match.

author: neo2000
author_rank: Newbie
timestamp: June 15, 2024, 03:22:45 pm
content: Ok, I tried another type of p-Type Mosfet as the SI2321DS. I used a SI2301 P-Type 20V 2.8A. My immediate problem was a dead short when powering up. In my opinion these should be N-Type as the drain has +9V and +5V on both sitting next to the coil?

author: fzabkar
author_rank: Super Contributor
timestamp: June 15, 2024, 05:38:35 pm
content: Can you show us the complete photo to provide some context? Which part drives the gate/base of the MOSFET/BJT?

author: neo2000
author_rank: Newbie
timestamp: June 16, 2024, 12:09:40 pm
content: Now, I have done what I should have done first. I removed a working part and put it in the device tester. The result is shown in the picture. Any advice which replacement part I can use to replace the blown ones?I also measured the drain of both near the coil, one is 5V, this should be for charging NiMH and the other one has 9V this should be for charging Li-Ion as on the source are 4.2V when charging Li-Ion.

author: wraper
author_rank: Unknown
timestamp: June 16, 2024, 12:15:57 pm
content: Numbers do not add up. 956pf Cg and 5.9 Ohm RDS(on)are mutually exclusive. First suggests it's a quite powerful part, second one suggests something as weak as 2N7002. These testers are shit and should not be trusted. Not to say if you had a working part, you could figure out if it's BJT or MOSFET and its type with multimeter and even without removing the part.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 16, 2024, 02:51:25 pm
content: The arrangement looks like a MOSFET half-bridge, Q17 high side, pin 1 = gate drive, pin 2 = output, pin 3 = VIN,; Q22 low side, pin 1 = gate drive, pin 2 = GND plane, pin 3 = output. Q17 will be bootstrapped, and both will be N-CH. Not sure why C51 and C59, but if they're DNP that's fine. R65 seems like it's pulling up, maybe? Not sure why the one trace snaking around. Q17 gate seems to go to via and nothing else, Q22 gate through R77 to via. Guessing a switching controller on the other side (or maybe just a gate driver and MCU. Doesn't look like there's current sensing, which is a bit disturbing. But maybe the load has a low-side shunt and they're doing it the slow way. Which might be good enough for a battery charger. I take it this is the output stage, then?Anything of comparable rating would probably do, i.e., a couple amperes and 20V, and you might want to trace the gate signals to see what Vgs(on) is and make sure they won't be driven beyond ratings, nor insufficient for current flow. But an exact replacement will need identification.Tim

author: lunaNode
author_rank: Newbie
timestamp: July 09, 2024, 08:35:34 am
content: I am betting it is an XTAR VC8 charger (or similar), as I found this post via google search for the same part for my charger.I have more details... I have a Peak DCA75 component tester and put in a working "D14JL" as only a few of mine were blown.The screenshots are the results.I am terrible at finding matching components, and could also use help.N-Ch Enhancement mode MOSFETRed-D Green-S Blue-GVgs(on)=0.801V at Id=5.02mA and Ig=1µAVgs(off)=0.471V at Id=5.2µAgm=84.3mA/V at Id=3.0mA to 5.0mARds(on)<1.0Ω at Id=5.0mA and Vgs=8.0Vwith 0.66Vf body diode

author: lunaNode
author_rank: Newbie
timestamp: July 10, 2024, 08:28:10 am
content: Found this:https://forum.digikey.com/t/help-identifying-transistor/32000They suggested 'AOSS32136C' or a 'DTS2314'DTS2314 - N-Channel 20 V (D-S) MOSFET from Din-TekAOSS32136C – N-Channel 20 V 6.5A (Ta) 1.3W (Ta) Surface Mount SOT-23-3 from Alpha & Omega Semiconductor Inc

author: neo2000
author_rank: Newbie
timestamp: July 10, 2024, 08:41:09 am
content: Yes, you are right. It's an XTAR VC8 with one channel burned down completely. I tried to replace all three burnt mosfets with SI2302, that worked but only partially. I was able to charge Li-Ion, but not NiMH as they were regognized as Li-Ion. So far, i removed them all again and left the slot dead until I find prober replacements.

author: lunaNode
author_rank: Newbie
timestamp: July 10, 2024, 05:16:11 pm
content: I ordered 40 of the 'AOSS32136C' from digikey, and will let you know if they work properly as a replacement once I get them.

author: fzabkar
author_rank: Super Contributor
timestamp: July 10, 2024, 05:21:55 pm
content: Quote from: lunaNode on July 10, 2024, 08:28:10 amDTS2305AGC has a part marking of D05xx:https://sg.world.taobao.com/item/651062373202.htmhttps://gw.alicdn.com/imgextra/i2/1058249728/O1CN01ZzSqBi2LjTcXAzTKL_!!0-item_pic.jpg(photo)This is consistent with a part marking of D14xx for DTS2314.

author: lunaNode
author_rank: Newbie
timestamp: July 14, 2024, 08:22:50 am
content: Okay I got the AOSS32136C and fixed mine.I tested a both lithium-ion and NI-MH in every channel and all were able to detect properly.BTW what happened was I was using alligator clips to charge a lipo pack, and I think I reversed the polarity or shorted the 2 leads while things were charging. The little MOSFETs smoked, it was very sad.Also the PCB trace bonding strength is garbage on these chargers, very chinesium. I pulled a couple of pads, just re-tinning them softly and at low temp.If any one wants, I will send them some AOSS32136Cs for free, as I have 36 left. Just DM me.