Alternate ?? Pinout for early LM324

[bw]

Found several of these, only marking is LM324
14 pin DIP, black epoxy
Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin 11.
Also, seems to not be "conventional" GND at pin 7 and V+ at pin 14.
Seem to recall reading of early DIP packages with different pinouts, but
unable to locate that reference.

Guess around 1970 mfg. but not marked with any codes.
Google keywords for alternate, early, original, etc do not seem to be
helpful.

 

[Michael Black]

On Tue, 26 May 2009, bw wrote:

Found several of these, only marking is LM324
14 pin DIP, black epoxy
Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin 11.
Also, seems to not be "conventional" GND at pin 7 and V+ at pin 14.
Seem to recall reading of early DIP packages with different pinouts, but
unable to locate that reference.

It's not an alternative pinout, you're assuming that all ICs have ground

at pin 7 (or pin 8 if it's sixteen pins) and +V at pin 14 (or 16). But
that's only certain for the 7400 series, and even then there were
exceptions. The 7475 quad latch had the power supply pins in the middle
for instance.

Take a look at most op-amps, and they don't have the pinout you'd expect.
The 555 timer doesn't match your expectations either, pin 1 is ground,
pin 8 is +v.

Right out of the 1978 National databook. Ground is pin 11, pin 4 is
+v


+in 3 5 10 12
-in 2 6 9 13
out 1 7 8 14

Guess around 1970 mfg. but not marked with any codes.
Google keywords for alternate, early, original, etc do not seem to be
helpful.

A few years later. I can remember when I first read about it, which

had to be after 1971, but I can't remember exactly when.

Michael

 

[keithw86@gmail.com]

On May 26, 8:02 pm, Michael Black <et...@ncf.ca> wrote:

On Tue, 26 May 2009, bw wrote:
Found several of these, only marking is LM324
14 pin DIP, black epoxy
Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin 11.
Also, seems to not be "conventional" GND at pin 7 and V+ at pin 14.
Seem to recall reading of early DIP packages with different pinouts, but
unable to locate that reference.

It's not an alternative pinout, you're assuming that all ICs have ground
at pin 7 (or pin 8 if it's sixteen pins) and +V at pin 14 (or 16).  But
that's only certain for the 7400 series, and even then there were
exceptions.  The 7475 quad latch had the power supply pins in the middle
for instance.

Take a look at most op-amps, and they don't have the pinout you'd expect.
The 555 timer doesn't match your expectations either, pin 1 is ground,
pin 8 is +v.

Right out of the 1978 National databook.  Ground is pin 11, pin 4 is
+v

+in  3  5  10 12
-in  2  6   9 13
out  1  7   8 14

Guess around 1970 mfg. but not marked with any codes.
Google keywords for alternate, early, original, etc do not seem to be
helpful.

A few years later.  I can remember when I first read about it, which
had to be after 1971, but I can't remember exactly when.

Fairchild introduced the uA741 in '68. I first used them in '71.

 

[keithw86@gmail.com]

On May 27, 7:18 am, "keith...@gmail.com" <keith...@gmail.com> wrote:

On May 26, 8:02 pm, Michael Black <et...@ncf.ca> wrote:



On Tue, 26 May 2009, bw wrote:
Found several of these, only marking is LM324
14 pin DIP, black epoxy
Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin 11.
Also, seems to not be "conventional" GND at pin 7 and V+ at pin 14.
Seem to recall reading of early DIP packages with different pinouts, but
unable to locate that reference.

It's not an alternative pinout, you're assuming that all ICs have ground
at pin 7 (or pin 8 if it's sixteen pins) and +V at pin 14 (or 16).  But
that's only certain for the 7400 series, and even then there were
exceptions.  The 7475 quad latch had the power supply pins in the middle
for instance.

Take a look at most op-amps, and they don't have the pinout you'd expect.
The 555 timer doesn't match your expectations either, pin 1 is ground,
pin 8 is +v.

Right out of the 1978 National databook.  Ground is pin 11, pin 4 is
+v

+in  3  5  10 12
-in  2  6   9 13
out  1  7   8 14

Guess around 1970 mfg. but not marked with any codes.
Google keywords for alternate, early, original, etc do not seem to be
helpful.

A few years later.  I can remember when I first read about it, which
had to be after 1971, but I can't remember exactly when.

Fairchild introduced the uA741 in '68.  I first used them in '71.

IIRC, the LM324 came out in '72 and I was using them by the boatload
when I graduated in '74.

 

[Phil Allison]

"bw" <bwegher@hotmail.com>

Found several of these, only marking is LM324
14 pin DIP, black epoxy
Pinout is not as shown in Nat. Semi. datasheet. V+ at pin 4, GND at pin
11.

** That is the same pinout that has always been used.

Guess around 1970 mfg.

** First released in 1974.

but not marked with any codes.
Google keywords for alternate, early, original, etc do not seem to be
helpful.

** No suprise there - since it simply does not exist.


.... Phil