Phototransistor question.

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Select "in stock" and sort by price. There are zillions of them, e.g.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

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Thanks, but I'd probably just hang them in effigy. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

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Back in the old daze, Fairchild made the FPT100 and the FPT101; the die was optimized for phototransistor operation; they were at least an order of magnitude more sensitive than those sold "for that purpose". Those sold "for that purpose" were nothing but a standard 2N2222 with the top of the can cut off and a lens glued in place.

The design of the FPT100/101 was that of a high beta transistor with a very small emitter square way off in the corner of the die - that way ALL of the area became useful for the necessary light capture function.

I might have some kicking around; only the illustrious Phil Hobbs is worthy of receiving any.

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Sorry, could not find any discrete devices - all were opto-couplers. the use of "-" in front of a term did not make it a "not"; using NOT() may have worked - result was a no find.

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..BUT you have to be VERY discrete..

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Oh, i absolutely LOVE liars like that.. what popped up was "PHOTOTRANSISTOR 3.0MM ROUND Transistor Polarity: NPN Wavelength Typ: 860nm Power Consumption: 75mW Transistor Case Style: T-1 (3mm) No. of Pins: 2 SVHC: No SVHC (20-Jun-2011) Bulb Size: T-1 (3mm) Collector Dark Current: 100nA LED

** A phototransistor with a WAVELENGTH???? ** A 2-pin NPN???? Their system is GIGO. A search using "in stock" gave a title of "127 Product results found for ?PHOTOTRANSISTOR? " and ALL of them had a WAVELENGTH. garbage.

Using "OPTICAL SENSOR (PHOTODETECTOR - "NPN") PHOTOTRANSISTOR" for search, one gets: Optoelectronics & Displays

Photo Transistors (11)

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No, not at all. It's in a filtered package, so its responsivity has a fairly sharp peak at 860 nm. That's what you usually want for IR remotes and such.

As for variety, there are these four out of the first 10:

Osram - SFH3710-3-Z Osram SFH3015FA-Z Everlight - PT91-21B/F10 Lite-On LTR-5576D Phototransistor IR Chip 3-Pin

And then in the next 10: Multicomp - OFT-3301 Everlight - PT42-21C/TR8 phototransistor npn top smd860nm water clear... Lite-On - LTR-4206 through hole high sensitivity phototransistor...

And then in the next 10: Everlight - PT204-6C phototransistor ir chip silicon npn transistor... Everlight - PT91-21C phototransistor 1.9mm rnd axial...

And in the next 10 Everlight - PT5529B/L2/H2-F phototransistor side black axial... infrared phototransistor.. (3 leads) Everlight - PT334-6C opto components phototransistor... phototransistor 5mm clear axial...

You get the picture.

Most phototransistors don't have the base pinned out, because it's very rarely used.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

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Thanks for the "Phil-terred" list of hot stuff with the glowing specs. I used some of mine for blue detection; a slightly different die-screet filter. Sorry for the mis-understanding on my part.

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And others will have shorter wavelengths to reflect that they are for ambient light sensing applications, like mine.

Charlie