transistor pinout question,..

A tab on a package for a standard BJT, usually indicates the emitter. A paint dot used to indicate the collector, but this is rare now. Almost all Japanese ( 2SA, B, C, D ) BJT's in a TO92 package have pinning of E-C-B with the device held pins down, and the flat towards you. Same goes for the much smaller packages that they use with a chamfered rather than half rounded back. Unfortunately, same cannot be said for U.S. ( 2N ) series devices, or European ( BC,BF etc ), where you will nornally need to look them up. Power devices in all varieties of flatpack such as TO220, Isowatt etc, normally have pinning of B-C-E, with the device held pins down, and the heat dissipating surface or metal tab, away from you. Alternatively, the writing towards you if you prefer to think of it that way. Any exposed metal on the device is usually common with the collector connection. TO3 "can" type power transistors' pins are B-E, with the device held pins up, with their offset from the centre line, away from you. The can is the collector connection. FETs re-write the book, so I would recommend looking them up - there are many good free datasheet sources on the net - just Google for them. Pinouts on schematics and data sheets, where they are just a plan view of the device, are invariably shown from the bottom looking onto the pins or leadouts.

Arfa

Try using Google's advanced search and search on datasheet and the part#. That eliminates a lot of the crud.

showing

A=20

all=20

E-C-B with=20

much=20

rounded=20

devices, or=20

Power=20

normally=20

writing=20

on the=20

power=20

offset=20

connection.=20

are=20

Pinouts=20

Try this web site for data sheets.

Tony

zap wrote in news:9pg1q2lt1oro4il9mcdokpho4hfrdo16ek@

You can search for an ECG replacement at

Try this web site for data sheets.

Tony

Arfa

Something missing from the electronic version of the NTE reference is the footnotes. Some subs are "Electrically Identical", but the pinout and or case may be different.

Search at:

The SK3007A is not SMD, it is an early germanium TO-1 metal cased component from the late '60s

Part Number = SK3007A Manufacturer Name = Various Description = Ge PNP Power BJT V(BR)CEO (V) = 16 V(BR)CBO (V) = 32 I(C) Abs.(A) Collector Current = 1.0 Absolute Max. Power Diss. (W) = 1.0 h(FE) Min. Static Current Gain = 55 h(FE) Max. Current gain. = 175 @I(C) (A) (Test Condition) = 5.0m f(T) Min. (Hz) Transition Freq = 1.5M Package = TO-1 Military = N

And beware of some devices like the once very popular BC214 that have a variant the BC214L with different pinout. I guess this was done so it could substitute in either of the 2 popular lead configurations.

Graham