I think the 10811 was the newer improved replacement for the 10544,
with the same connections and external signals, and a little better
performance. In that era of equipment you may see either one. They
should be interchangeable, and the manuals and specs for both are
readily available.
Ed
Not quite same connections. Although the 10811 was designed
to be a plug-in replacement for the 10544 the converse is not true.
The 10544A requires additional connections (pins 8 and 9) for
oven controller power and it is not always a valid replacement
for a 10811, depending on the instrument in which it is installed.
The symptom is the 10544A never warms up.
The 10544B does not have this problem. See datasheets at:
http://www.leapsecond.com/museum/10544/
/tvb
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