Blast it all. Trannie help..
The Dark force of dance
batzman at dove.mtx.net.au
Sun Jul 13 03:57:23 CEST 1997
Y-ellow Jason 'n' all.
Yes I'm back from the dead. Though I still feel like a corps some
times. Mainly because I tend to hang arround the fridge a lot these days.
Anyway...
TIS is one of Texas instruments's generic markings it means. "Small signal
transistor. Plastic Case" Check out Texas instruments's web page which I'm
sure you'll find on my web page in the electronic links section somewhere.
(Because I don't wanna go have a look myself at this time.)
Even through I'd just love you to clock up some time on my web page, a
better way would be to use the Alta Vista search engine. It tends to know a
hell of a lot about electronics these days. You could try searching for
TIS93 (using lower case of course) and it may well take you straight to the
PDF file. Alternatively search for Texas instruments and they should have
their own part number search engine.
Now whilst we're on the subject of transistors, The following is an old FAQ
on transistors from the old sci.electronics news groups. It's absolutely
invaluable and thus I share it here. Capture it and store it for future
reference. You'll be so glad you did.
Hope this helps.
Be absolutely ICebox.
_ __ _
| "_ \ | | batzman at dove.mtx.net.au / aek at gist.net.au
| |_)/ __ _| |_ ____ ALL ELECTRIC KITCHEN
| _ \ / _` | __|___ | The new AEK CD, Elementary Urban sanity
| |_) | (_| | |_ / / is out now on Transmission Communications from
|_,__/ \__,_|\__|/ / http://brisbane.dialix.com.au:80/~com11
/ ,__ and check out http://www2.gist.net.au/~aek/
Goodfortune |_____| Do yourself a favour. Get your SANITY and wear it out.
Transistor Info.
A FAQ on this newsgroup [sci.electronics] is "I have a transistor marked
..., what type is it?".In order to help answer these problems I have
compiled a description of the three major transistor marking codes. We are
lucky with transistors that, apart from a few oddities which I'll talk
about later, most markings follow one of these codes. ICs are more tricky
as you're often dealing with custom chips or mask programmed devices with
manufacturers individual codes. A quick hint though: always look for known
numbers (eg 723, 6502, 2764) etc between the suffix and prefix, and beware
of the date code.
Right, back to transistors. The three standard transistor marking schemes
are:
1. Joint Electron Device Engineering Council (JEDEC).
These take the form:
digit, letter, serial number, [suffix]
The letter is always 'N', and the first digit is one less than the
number of legs, (2 for transistors unless they're crippled although
I'm not sure about 4 legged transistors maybe they get a 3) except for
4N and 5N which are reserved for optocouplers. The serial number runs
from 100 to 9999 and tell nothing about the transistor except its
approximate time of introduction.
The (optional) suffix indicates the gain (hfe) group of the device:
A = low gain
B = medium gain
C = high gain
No suffix = ungrouped (any gain).
See the data sheet for the actual gain spread and groupings. The
reason for gain grouping is that the low gain devices are fractionally
cheaper than the high gain devices, resulting in savings for high
volume users.
Examples- 2N3819, 2N2221A, 2N904.
2. Japanese Industrial Standard (JIS).
These take the form:
digit, two letters, serial number, [suffix]
Again, the digit is one less than the number of legs.
The letters indicate the applicatin area and flavour of the device
according to the following code:
SA: PNP HF transistor SB: PNP AF transistor
SC: NPN HF transistor SD: NPN AF transistor
SE: Diodes SF: Thyristors
SG: Gunn devices SH: UJT
SJ: P-channel FET/MOSFET SK: N-channel FET/MOSFET
SM: Triac SQ: LED
SR: Rectifier SS: Signal diodes
ST: Avalanche diodes SV: Varicaps
SZ: Zener diodes
The serial number runs from 10-9999. The (optional) suffix indicates
that the type is approved for use by various Japanese organizations.
NOTE: since the code for transistors always begins with 2S, it is
sometimes (more often than not is seems) ommitted so, for example, a
2SC733 would be marked C 733.
Examples- 2SA1187, 2SB646, 2SC733.
3. Pro-electron.
These take the form:
two letters, [letter], serial number, [suffix]
The first letter indicates the material:
A = Ge
B = Si
C = GaAs
R = compound materials.
Needless to say the biggest majority of transistors begin with a B.
The second letter indicates the device application:
A: Diode RF
B: Variac
C: transistor, AF, small signal
D: transistor, AF, power
E: Tunnel diode
F: transistor, HF, small signal
K: Hall effect device
L: Transistor, HF, power
N: Optocoupler
P: Radiation sensitive device
Q: Radiation producing device
R: Thyristor, Low power
T: Thyristor, Power
U: Transistor, power, switching
Y: Rectifier
Z: Zener, or voltage regulator diode
The third letter indicates that the device is intended for industrial
or professional rather than commercial applications. It is usually a
W,X,Y or Z. The serial number runs from 100-9999. The suffix indicates
the gain grouping, as for JEDEC.
Examples- BC108A, BAW68, BF239, BFY51.
Apart from JEDEC, JIS and Pro-electron, manufacturers often introduce their
own types, for commercial reasons (ie to get their name into the code) or
to emphasise that the range belongs to a specialist application.
Common brand specific prefixes are:
MJ: Motorolla power, metal case
MJE: Motorolla power, plastic case
MPS: Motorolla low power, plastic case
MRF: Motorolla HF, VHF and microwave transistor
RCA: RCA
RCS: RCS
TIP: Texas Instruments power transistor (platic case)
TIPL: TI planar power transistor
TIS: TI small signal transistor (plastic case)
ZT: Ferranti
ZTX: Ferranti
Examples- ZTX302, TIP31A, MJE3055, TIS43.
Many manufacturers also make custom parts for large volume OEM use. These
parts are optimised for use in a given part of a given circuit. They
usually just have a manufacturers stamp and an untraceable number. Often
when a company goes bankrupt, or has surplus at the end of a production
run, these transistors find their way into hobbyist bargain packs. There is
no way that you can trace data on these devices, so they are only suitable
as LED drivers, buffers, etc, where the actual parameters are not
important. Check carefully before buying.
Once you have identified your part, a trip to the data sheet or equivalents
book is called for (anyone know of an on-line equivalents list?).
Well good luck.
Mark
mark-r at snow_white.ee.man.ac.uk
At 04:28 AM 7/11/97 -0500, \[22Hz\] Productions wrote:
>
> I need a couple of transistors.. Their values are unfortunately
>handwritten in the schematics I have, and, as I really have no idea what
>I'm doing, have no idea how to read the #'s. =) They appear to be "TIS93"
>but the I could be a 1 and the S could be a 5. I cannot differentiate the
>2 characters elsewhere in the schems, though the S is written differently
>than 5s, leading me to believe it's an S. If anyone who recognizes these
>values could tell me what they are, I'd greatly appreciate it..
>
> On the other bit: I've looked for all permutations of the part #
>and in my Mouser and Digikey catalogs, found nothing. As this schematic
>is 25 years old, I suspected that result. *If* anyone recognizes these,
>and knows a suitable replacement part that exists today, that information
>would be even *more* useful. =) Thanks muchly, anyone...
>
> Jason, the uneducated..
>
>
> Synthfool: It's Q3 and Q4 on the Sonic 6 board 2 that I'm referring
>to... the 3080 helped (oddly enough) alot, but didn't restore function to the
>volume slider.. It's stuck at about 5 instead of 2 though; odd situation. =)
>
>
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