![]() ![]() Message #7 Posted by Alberto Fenini on, 4:42 p.m. Message #6 Posted by Ignazio Cara (Italy) on, 2:09 p.m.,įrom the very good pages of Jack Laporte I can report: I haven't found any of them in the various cross-reference listings I have, maybe someone else has some information on these part-numbers? I wonder if one of the groups of digits on the OP's transsitors is actually a date code. So if you find one marked 4-471, that's an 1854-0471 silicon NPN transistor. ![]() To save space on small transistor packages, sometimes only the last digit of the first group and the 'significant digits' of the second group are printed on the package. There are tables in a few HP instrument manuals, but not all. The first group gives the type of component. HP component part numbers consist of 2 4-digit groups. So the CPU Control PCB in an HP98x0 is a 09810-66513 (it was first used in the HP9810 calculator). HP assembly part numbers (like PCBs, etc) have part numbers consisting of 2 5-digit groups, the first groups seems to be the model number of the instrument that first used that assembly, with leading zeros added. Some general information on HP part numbers : In response to message #3 by Alberto Fenini Message #4 Posted by Tony Duell on, 4:16 a.m., So that the question could also be, does anyone has a complete list of the HP part numbers including the used transitors for a given model ? The third is obviuosly wrong, since it's an IC and we are looking for a transistor. Of the item read from the transistor and it doens't always work.įor instance, if you take 0414-668, and search for 0668 you will find : If the original HP part number is known it works like a charm.īut I did some tries adding the leading zero to the second part Thank you very much for the pdf document, it is very very nice, In response to message #2 by Katie Wasserman Message #3 Posted by Alberto Fenini on, 7:18 p.m., However it's more than possible that I'm totally wrong about this, so perhaps someone else can jump in here. So a 0413-393 would translate to: XXXX-0393 and you'd find that this is is equivalent to a 2N3330 I have the vague recollection of reading how HP codes some of their transistors: add a leading zero on the last 3 digits and ignore the leading 4 digits. In response to message #1 by Alberto Fenini Message #2 Posted by Katie Wasserman on, 6:13 p.m., Transistor is marked with NSC logo and 430 3-459. A6 Output Amplifier has Q210 as HP 1853-0459 PNP PD 625mW FT 200MHz. Trying to repair a 8657B Signal Generator. Thank you very much for any help provided, take care Alberto Subject: hpagilentequipment Transistor Cross Reference. Which has several equivalents that can be found for example here :ĭoes anyone know how it can be done for the rest of the transistors ?Ġ413-393 which is the one between the cathode and anode driverĠ414-668 (qty two) on the back side of the same pcb Jaques, but I guess is not the only one, was able to find a cross reference from the classic power supply's transitors, into some ECG-XXX models.įor example : the 0393-338 can be replaced with a ECG-189 In both cases, I need to replace some of the transistors present on the boards. ![]() I have recently opened two topics, one was for the classic power supply and the other was for the restoration of an HP67. Message #1 Posted by Alberto Fenini on, 5:45 p.m. ACT-E128K32C-140F2C.Transistor equivalence The Museum of HP Calculators. ![]()
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