Electronics > Beginners

Jellybean hobbyist general purpose transistors..

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Lassivv:
Try to buy some good "middle-way" mosfets on my stock.

Normally i drive something 12-24vdc (leds, motor etc) with mosfets (90% different leds).

Now i have stock
- ULN2003
- IRFZ44N
- Here maybe need one more cheap option (trough hole) model.

Then i need some SMD models. (use many hours on Mouser find and Nexperia chips seems interesting)
cheaper, not that good RDS
https://www.mouser.fi/ProductDetail/Nexperia/PSMN7R5-30YLDX/

little pricier, better RDS
https://www.mouser.fi/ProductDetail/Nexperia/PSMN2R4-30MLDX/

Find so many different voltage/Ampere/RDS models and same footprint. Quite cheap parts and because Mouser/Farnell i think they are good quality and not any fakes or something like that.

Every hints/tips are welcome. Need one more good/cheap throught hole model (like mosfets more than transistors). And what you think Nexperia chips.

David Hess:

--- Quote from: Cerebus on October 20, 2017, 09:17:59 pm ---Wouldn't life be easier if, instead of the JEDEC/whatever part numbering scheme evolving, we'd had something like the National book. Here's the set of dies, here's the parameters we actually test and here's the bins we put them into and the part numbers for those bins.

I still find myself going to the (defunct) National databook to find a suitable part from time to time just because the layout by process makes it easier to navigate.
--- End quote ---

That would be nice and I use the old National Discrete databook for the same thing.  For instance it is especially annoying with On's (and now Fairchild's since they bought them) product portfolio because there are parts I know exist, like fast saturated switches, which cannot be searched for.  Transistors built using different processes like perforated and ring emitter structures should be labeled.  This would have helped distinguish all the variations of the 2N3055.

The same thing occurs with Texas Instruments and their various linear parts.  They often do not include even simplified or equivalent schematics so it is not always apparent how the input and output circuits work which is important in some applications.

I wonder what advantage the various manufacturer's think is provided by withholding this information.

Wolfgang:

--- Quote from: David Hess on October 14, 2017, 02:26:59 am ---
--- Quote from: T3sl4co1l on October 13, 2017, 05:25:29 pm ---
--- Quote from: David Hess on October 13, 2017, 05:54:49 am ---the 150 volt 2N5401 and 2N5551 would be more suitable.
--- End quote ---

Or the similar MPSA46, or whatever they are, from that family.  MJE350 and complement are also quite popular for audio (driver stage), though the datasheet is sorely wanting.  I think On Semi makes a detailed datasheet?  Or, there are equivalent parts with good data out there, shop around.
--- End quote ---

Did you mean the MPSA43/MPSA93?  They are a little slower.

The Motorola/On MJE371/MJE521 are the same way.  They are recommended for specific applications but lack a full set of specifications.  I ran across them when doing a search for fast TO-126, TO-225, and TO-220 parts to use in high performance regulators.

The BD135 through BD140 are like that also.  The ST and Fairchild datasheets say nothing about dynamic performance but there are SavantIC Semiconductor (who?) datasheets which say 190 MHz for the NPNs and 160 MHz for the PNPs.  What?

--- End quote ---

For HV work if often use MPSA44 and MPSA94 (400V) or MJE340 and MJE350. Medium speed, but reliable.

vk6zgo:

--- Quote from: Vtile on October 14, 2017, 10:38:43 am ---How disturbing it is that VHF means very high frequenzy in a 30 MHz to 300 MHz range while every dog collar today transmit in Gigahertz range Wifi. Anyone else annoyed.  >:D ^-^

--- End quote ---

No, as the distinctions are well known, & you  can get charts showing the division of the spectrum.
The actual terms are as they are for historical reasons, & changing them now would be even more confusing.

vk6zgo:
Back in the day, a supplier in my home city used to have a "lolly jar" ( candy jar to NA folk) containing a huge quantity of "cleanskin" unmarked NPN silicon transistors, which they sold for a few cents each

They had the same package as the BC107, BC108 series, & would work in most of the same circuits which used those.
We called them "BC10?" Transistors.

In a repair situation, you will often find manufacturers will use the same device in both a critical & non-critical  position.
If the one in the critical spot dies, steal the non-critical one, & replace it in the non-critical spot with a generic transistor.

Another trick is to have a look at what device some other company uses in a similar position.
Sometimes, it is cheaper & has better specs.

I replaced the horizontal output transistors in a lot of Sony 27" picture monitors with Philips BU208D devices with universally good results.
Although Sony were good with parts supply, BU208D transistors were cheaper & available "anywhere"..

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