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| Which value I should use |
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| Jasonbit:
Hello folks, I am looking around on various datasheets and I was compare this two files, relating to BC547: 1-http://www.mouser.com/ds/2/149/BC547-190204.pdf 2-http://www.farnell.com/datasheets/59764.pdf On two datasheets, from the same manufacturer, I have on table "Absolute Maximum Ratings" 500mA and 100mA to Ic - Collector Current. Which value I should look and how can I identify if this value is version A, B or C? Thanks |
| Benta:
BC547 was always a 100 mA transistor. A, B and C are the hFE sortings. |
| spec:
+ Jasonbit Yes, datasheets can be a nightmare. The 'Mouser' spec is 2014, while the Farnell spec is 1997, so as far as specs are concerned go by the most modern you can find, but only use a datasheet from one of the top tier companies, like Fairchild for example. In terms of what to buy: a BC547 from either company is liable to be the same, they may even come from the same production batch. By the way, the fundamentally important parameter is the transistor's junction temperature and thermal resistance, rather than power rating which is a bit of a 'sales' figure. The maximum current rating is important, but you would rarely run a transistor at it's maximum current. As to the 500mA max IC, that just does not make any sense, as Benta implies. You ask how you know which version you will be ordering. Normally the BC547 will have the suffix printed after the base number. For example a BC547 would be marked BC547B and the ordering information should specify this too. Remember, if there is no mention of the suffix you will get a plain BC547 which has a very wide current gain (HFE). It's the minimum gain that counts and 110 is still respectable. Incidentally, if you are looking for a good small signal transistor for your spares box, the BC546 is the best bet: it has a 65V C/E rating. The PNP compliment is the BC556. If you did need a transistor with a bit more current capability, the 45V/800mA BC337/BC327 are a good choice. |
| Audioguru:
Why are you looking at wrongly copied spec's from a store instead of from the manufacturer? |
| Jasonbit:
--- Quote from: Audioguru on November 02, 2018, 11:02:09 pm ---Why are you looking at wrongly copied spec's from a store instead of from the manufacturer? --- End quote --- But the Farnell is: --- Quote ---Farnell element14 is a high-service distributor of technology products, services and solutions for electronic system design, maintenance and repair. --- End quote --- The Mouser is: --- Quote ---Mouser Electronics is a worldwide leading authorised distributor of .... --- End quote --- at least On Semiconductor is: --- Quote --- Our products, tools, and solution are engineered to help you design, build, and think more efficiently. --- End quote --- I can't know if the On Semiconductor it is a manufacturer and distributor or only a distributor. What do you mean to say is that I should look through website https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/BC547?qs=UMEuL5FsraAqhvn1CRuL1g==, for example in this document: https://www.mouser.com/datasheet/2/308/BC547-1118654.pdf Is it this? Thanks |
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