12/26/2023 0 Comments Transistor tester dca55![]() I recommend using ZIF IC socket for transistors. Great site, thanks for your work, Mark! Here's my 2 cents. These need to be tried out, as it may be interesting to have germs with zero leakage. I do have pretty high hopes for those, as someone on the DIYSB stated that russian PNPs are usually better than NPNs. I'm currently waiting for batches of PNP P416As and P416Bs. All i've encountered are low on leakage, but that hardly compesates for low gains. Sadly most of the russian germs i've had tend to be always on the low end of the hFE range specified by the datasheet. I guess that these do need some breadboarding before soldering them to anything. 50-70 NPN germs are nice, but they could have been better. Even though the seller from russia stated on the item's details that they have hFE of 60.180(114*), with 114 stated as typical, i only got readings from 29 to 82. ![]() So i started to measure these with my meter's hFE tester with ground pin lifted. Found out from the internets that these seem to have internal shunt resistor, so there is virtually no leakage. Couldn't get any leakage out of any of them, so i once again inspected my test rig from every angle. I started to handle these like any other NPN, but with breadboard, as their pinout is BCE. These have four legs, and one is for grounding the case. Thankfully i didn't get more than twenty. But i can't recommend them, unless you are looking for big, cheap batch of transistors to use as buffers. These are currently going for $15 for hundred pcs on ebay. Still, i hoped for better batch, but now i do have lifetime supply of cool looking PNP germanium buffer transistors. Under 30 hFE, i can't think any use for them. Decorative items maybe? or straight to trash. I had to double check my power source and trimmer on the measuring board, but i have to believe it. ![]() I got both 30-40 and 40-50 ranges around 40% each and only 6 devices in the range of 51-60. 16% were under the rated 30, with measurements ranging from 23-29. Leaks are low, all between 80♚ and 280♚ with average around 120♚, but these are really low gain devices. They are really consistant, but they are bad. According to datasheet, these should be 30-80 hFE, so i assumed i would get a whole lot in low, but still usable 51-60 and 61-70 devices in that 100. ![]() Went through my batch of 100 grey paint coated MP25Bs yesterday. ![]()
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