155-0078-00

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The 155-0078-xx (M084) is a Tek-made broadband vertical amplifier integrated circuit in a minipac package. The input and output are differential. The 155-0078 and its test fixture was designed by John Addis for the 485 scope (Note 1), which uses no less than 18 of these chips in various grades.

The rise time of each M84 was tested using the 25ps Push-Pull Pulse Generator, and parts were binned and were given part numbers with an appropriate speed suffix. Each M84 was also tested for DC characteristics such as balance.

The last two digits of the 155-0078-xx part number are determined by a selection process after manufacture. These characteristics are summarized below:
SUFFIX SPEED DC CHARACTERISTICS REPLACEABLE BY
00 Fast Best ----
01 Fast Third best -03,-00
02 Fast Most relaxed -01,-03,-00
03 Fast Second best -00
04 Slow Same as -00 -00
05 Slow Same as -01 -03,-00,-07,-04
06 Slow Same as -02 -01,-03,-00,-05,-07,-04
07 Slow Same as -03 -00,-04
10 Fast Best ----
11 Fast Third best -13,-10
12 Fast Most relaxed -11,-13,-10
13 Fast Second best -10
Sometimes an instrument will contain a better grade of part than called for in the manual.

The manual should be consulted for the correct replacement type.

The M84 also comes in 14-pin DIP, as 155-0273-00 and 155-0274-00 (slower grade).

Pictures

Used in

Notes

  • Note 1: See John Addis quote in 7A11 article

Datasheet