As titled. I haven't been able to find one.
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sigpicThe Sky Is Falling
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Re: Anyone got a datasheet for upc255a?
this may help
looks like a 709 / 741 type op-amp
http://www.vetco.net/catalog/product...oducts_id=6174 -
Re: Anyone got a datasheet for upc255a?
Thanks STJ. I found an equivalency sheet that gave the NTE and a few others. I found their datasheets just can't find the NEC datasheet. I've got a schematic that gives the pinout for the NEC but just want to be sure by finding the NEC datasheet. The board has 4 pins in a row like the rectangular op amps and I was thinking maybe I could just put a socket in and could then use more modern op amps in the unit. Out of eight I have, I've found two bad already. So I was thinking that's a pretty high failure rate.sigpicThe Sky Is FallingComment
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Re: Anyone got a datasheet for upc255a?
old op-amps did fail a lot.
for the nec, you may need to look for a pdf of an old nec databook rather than a datasheet.
datasheets did not really exist before the net.Comment
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Re: Anyone got a datasheet for upc255a?
I think a place called IC37.com has a datasheet for it. Too bad I can't read Japanese. It looks like they want 15 Yen for it which is what, maybe a dime. Too bad for me.sigpicThe Sky Is FallingComment
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Hi guys
I have a MacBook Pro A1990 that takes 4.9 Volts and .592 to .615 amps on one port. The other port on the left side power cycles with about the same amount of volts an amps but quickly power cycles. The same thing happens on the other side but opposite. So on the left side the bottom port stays on and on the right side it's the top one. I think it is a CD3215 chip but I am not sure how to test it or where to get one. I have checked for voltage at ppbus_g3h and it has 12.6 V which is also on fuses f7000 and f7001 I checked pp1v2_s3 and it has 1.2 V then... -
Hi, pulled this component, (I'm assuming it's a MosFET) from an LED COB video light. Im trying to find the datasheet so I can find an equivalent replacement but no luck. Any assistance with the datasheet would be appreciated.
Failing that, a way to pick a suitable replacement component? If it's indeed a switching fet, I'm assuming I might need to measure the switching clock frequency and find a component that meets the power capacity?
Its a pair of them driving a 130w Light. Takes in 19volts. I can borrow a scope to measure the switching freq.... -
Customer came in with shorted USB C chips, replaced and the chips are now responding beautifully HOWEVER, I am only getting 5Volts .25 amps (sometimes .243 amps) I see that the T2 chip is turning on, but I am not seeing any voltage at the SSD rails for example,
PP5VG3S_EN is not present which would somewhat indicate a PMIC U7800 issue, but I checked the voltage on the PMIC and that is present and not shorted. I tested for PP5V_G3S and those rails are not present.
ISL9240HI is present, I am also getting 12.30 volts at PPBUS_G3H so no shorts there. Both CD3217 chips were successfully... -
I got a dead HD6950 on Ebay to try my luck and repair it. There were a few broken off capacitors that I already replaced.
Measuring the PCI-E lanes I got somewhat weird measurements, the gpu might or might not be dead.
If I plug the GPU in, the core heats up and I also get VCore but on two inductors that measure 16 and 60 Ohms respectively (Memory and PEX I guess) there is no voltage.
On one of the two buck-controllers (APW7165) the enable pin is pulled to GND and the other controller I just cannot find a datasheet for.
So if anyone has a datasheet or at least... -
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