more matched pairs

[Martin Czech]

Roman Sowa <Roman.Sowa at WizjaTV.pl> mailed the SSM data sheets to me, yes
these guys look pretty much like relaxed (derated) spec MAT.  The worst
bin MAT (type F) have almost the same data. The only advantage for
precision work is then the sealed encapsulation (mechanical & thermal
stress, humidity), the SSM come mostly in plastic DIP.  So, if you pay
the money for a MAT, get an A grade!

The typical MAT SSM data are identical.

Let's see the spec again (typical, @ 25C, values made comparable if possible):

                         THAT120             MAT03F           CA3096    2SA1349      SSM2210 (npn!)  SSM2220

Current gain @ 1mA       75                  165              47        200 min      605             165
Current gain matching    5% (1mA)            0.5% (100uA)     ?         10% max      0.5%            0.5%
Rbe                      2 Ohm               0.3Ohm                     ?            0.3Ohm          0.3%
Offset voltage           500uV               40uV             150uV     10mV max     10uV            40uV
Offset current           70nA                6nA              2nA       ?            6.2nA max       6nA
Noise voltage density    0.75nV/SQRT(Hz)     0.7nV/SQRT(Hz)   ?                      0.85nV/SQRT(Hz) 0.7nV/SQRT(Hz)
Collector Base Leak      25pA                50pA             60pA      100nA max    25pA            50pA



m.c.