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'[EE]: Standardised, generic, 'jellybean' component'
2008\09\11@124514 by Philip Pemberton

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Hi guys,
  I've just finished cataloguing the "easy stuff" (complete reels of parts)
in my random collection of components, and it seems that while I've got rather
a lot of transistors (I've more or less standardised on the BC547 and BC557),
I don't seem to have much in the way of FETs and opamps and the like...

  I'm drawing up a list of standard parts that I tend to use a lot of.
Usually that means they meet most of (if not all of) these criteria:
   - Cheap.
   - Stocked by multiple suppliers.
   - Ideally second-sourced by a few different manufacturers.
   - Did I mention cheap?

Thus far, I've come up with the following:
  NPN BJT, low  power: BC547 or BC847
  PNP BJT, low  power: BC557 or BC857
  NPN BJT, med. power: BD139
  PNP BJT, med. power: BD140
  NPN BJT, high power: MJE3055T
  PNP BJT, high power: MJE2955T
  Diode, signal:       1N4148
  Diode, rectifier:    1N4001
  Diode, Schottky:     1N5817 or 1N5819 (interestingly Farnell have the
better-specified 1N5819G listed at a lower price than the '5817G)
  N-FET, low power:    2N7000
  P-FET, low power:    BSS84
  3.3V LDO:            Zetex ZXCL330E5TA
  3.3V LDO, high pwr.: OnSemi NCP565D2T33G
  RS232 level xlat'r:  Texas Instruments MAX232. Less than a third the price
of Maxim's part, and does the same job. Also 2nd-sourced by Sipex/Exar (as
SP232), original by Maxim (at their usual insane prices).

And here are a few I'm not so sure about:
  N-FET, high power:   -- not a clue...
  P-FET, high power:   Fairchild FDS4435? About a quid each, or 50p each in
25-off. 8A, 30V -- pretty meaty for an SO8.
  Opamp:               LM358? I have rather a lot of NE5532s new-in-rail, but
have found that the 358 tends to be more useful in low-power hi-Z circuitry.
Oddly, the 358 is cheaper than the 5532.
  Phototransistor:     I usually keep a few SFH300s around, but it seems only
Maplin still stock them (at a ridiculous price).

Does anyone have any particular favourites, suggestions to fill the gaps, or
comments on my selections?

Thanks,
--
Phil.
spam_OUTpiclistTakeThisOuTspamphilpem.me.uk
http://www.philpem.me.uk/

2008\09\11@124540 by Philip Pemberton

face
flavicon
face
Hi guys,
  I've just finished cataloguing the "easy stuff" (complete reels of parts)
in my random collection of components, and it seems that while I've got rather
a lot of transistors (I've more or less standardised on the BC547 and BC557),
I don't seem to have much in the way of FETs and opamps and the like...

  I'm drawing up a list of standard parts that I tend to use a lot of.
Usually that means they meet most of (if not all of) these criteria:
   - Cheap.
   - Stocked by multiple suppliers.
   - Ideally second-sourced by a few different manufacturers.
   - Did I mention cheap?

Thus far, I've come up with the following:
  NPN BJT, low  power: BC547 or BC847
  PNP BJT, low  power: BC557 or BC857
  NPN BJT, med. power: BD139
  PNP BJT, med. power: BD140
  NPN BJT, high power: MJE3055T
  PNP BJT, high power: MJE2955T
  Diode, signal:       1N4148
  Diode, rectifier:    1N4001
  Diode, Schottky:     1N5817 or 1N5819 (interestingly Farnell have the
better-specified 1N5819G listed at a lower price than the '5817G)
  N-FET, low power:    2N7000
  P-FET, low power:    BSS84
  3.3V LDO:            Zetex ZXCL330E5TA
  3.3V LDO, high pwr.: OnSemi NCP565D2T33G
  RS232 level xlat'r:  Texas Instruments MAX232. Less than a third the price
of Maxim's part, and does the same job. Also 2nd-sourced by Sipex/Exar (as
SP232), original by Maxim (at their usual insane prices).

And here are a few I'm not so sure about:
  N-FET, high power:   -- not a clue...
  P-FET, high power:   Fairchild FDS4435? About a quid each, or 50p each in
25-off. 8A, 30V -- pretty meaty for an SO8.
  Opamp:               LM358? I have rather a lot of NE5532s new-in-rail, but
have found that the 358 tends to be more useful in low-power hi-Z circuitry.
Oddly, the 358 is cheaper than the 5532.
  Phototransistor:     I usually keep a few SFH300s around, but it seems only
Maplin still stock them (at a ridiculous price).

Does anyone have any particular favourites, suggestions to fill the gaps, or
comments on my selections?

Thanks,
--
Phil.
.....piclistKILLspamspam@spam@philpem.me.uk
http://www.philpem.me.uk/

2008\09\11@134545 by sergio masci

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On Thu, 11 Sep 2008, Philip Pemberton wrote:

>    Phototransistor:     I usually keep a few SFH300s around, but it seems only
> Maplin still stock them (at a ridiculous price).
>

SFH309 available from Wouter

Regards
Sergio Masci

2008\09\11@184854 by Philip Pemberton

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sergio masci wrote:
> SFH309 available from Wouter

The SFH309 is a 3mm IR-filtered part; the SFH300 is a water-clear 5mm part.
Other than size, the SFH309 only responds to IR -- the SFH300 will respond to
nearly anything from near-IR to deep blue / violet.

It seems the nearest modern equivalent to the SFH300 is the Vishay BPW96,
which is almost a perfect match. Same size, slightly lower "light current",
but close enough for most things. The BPV11 is also fairly similar, but about
twice the price of the BPW96...

Thanks,
--
Phil.
piclistspamKILLspamphilpem.me.uk
http://www.philpem.me.uk/

2008\09\11@192957 by sergio masci
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On Thu, 11 Sep 2008, Philip Pemberton wrote:

{Quote hidden}

Hi Phil, I've looked at the datasheets again and see nothing about the
SFH309 being an IR filtered part. I did note that it has a response range
from 380nm to 1180nm while the SFH300 has a response range from 420nm to
1130nm.

What am missing / misreading?

Regards
Sergio Masci

2008\09\11@195603 by Philip Pemberton

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sergio masci wrote:
> Hi Phil, I've looked at the datasheets again and see nothing about the
> SFH309 being an IR filtered part. I did note that it has a response range
> from 380nm to 1180nm while the SFH300 has a response range from 420nm to
> 1130nm.
>
> What am missing / misreading?

Take a look at the photo at <http://www.voti.nl/shop/catalog.html?T-SFH309>
and the PDF datasheet at
<http://komponenten.es.aau.dk/fileadmin/komponenten/Data_Sheet/Opto/SFH309.pdf>.
You have to read between the lines a bit:

- Especially suitable for applications from 380nm to 1180nm (SFH309) and of
880nm (SFH309FA)

Note the black colour of the SFH309FA illustration of the datasheet, and the
severely limited spectral response. The spectral response alone indicates some
form of IR filtering package; the black case confirms it. The standard SFH309
has a clear resin (or plastic) package and will respond to just about any
wavelength in the visible light spectrum, and most of the near-IR range too.

I tend to use SFH300s because they're very sensitive to red light, especially
laser light. I've got a 1mW Maplin "experimenter's laser module" and an SFH300
rigged up on a breadboard to measure the rotation speed (in RPM) of a motor's
drive shaft. It works pretty well - most of the limitations are on the PIC
side (mostly the CCP bottoming out when the speed goes below ~600RPM). Optical
alignment is a bit of a pain, but easier when the laser's collimator lens is
deliberately set slightly out of focus.

--
Phil.
.....piclistKILLspamspam.....philpem.me.uk
http://www.philpem.me.uk/

2008\09\12@034224 by sergio masci

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On Fri, 12 Sep 2008, Philip Pemberton wrote:

{Quote hidden}

But it's the SFH309 I was talking about not the SFH309FA. I could have
sworn the ones in my bit box came from Wouter. Maybe Wouter could "clear"
up exactly which of the two he does actuall sell :-)

Regards
Sergio Masci

2008\09\12@120920 by sergio masci

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came straight to me instead of going through the list.

---------- Forwarded message ----------
Date: Fri, 12 Sep 2008 09:47:34 +0200

> But it's the SFH309 I was talking about not the SFH309FA. I could have
> sworn the ones in my bit box came from Wouter. Maybe Wouter could "clear"
> up exactly which of the two he does actuall sell :-)

My supplier calls it an SFH309 (so that is what I call it in my shop), but the
package is dark blue, which makes me suspect that it might actually be an
SFH309FA.

If someone has an SFH309 around, please take a look and tell me the color?

--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

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