2N4851

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The 2N4851  (P/N 151-0504-00,151-0504-01) is a silicon unijunction transistor. It is often used as a simple relaxation oscillator (e.g. for the variable display time in TM500 frequency counters such as the DC501.

Used in

Some instruments using part 2N4851

Instrument Manufacturer Class Model Description Introduced
212 Tektronix Oscilloscope 212 500 kHz miniature dual channel analog scope 1973
214 Tektronix Oscilloscope 214 Portable dual-trace storage scope 1974
4631 Tektronix Printer 4631 Video Hard Copy Unit 1976
4632 Tektronix Printer 4632 Video hardcopy unit 1974
4701 Tektronix Multiplexer 4701 8-channel multiplexer 1971
7D01 Tektronix Plug-in 7D01 16-ch Logic Analyzer 1976
7D12 Tektronix Plug-in 7D12 digital meter plugin 1974
7L12 Tektronix Plug-in 7L12 1.8 GHz Spectrum Analyzer 1971
DC501 Tektronix Plug-in DC501 basic 100 MHz frequency counter 1972
DC502 Tektronix Plug-in DC502 550 MHz frequency counter 1972
DC503 Tektronix Plug-in DC503 100 MHz, 7-digit frequency counter 1972
DC503A Tektronix Plug-in DC503A 125 MHz, 8-digit frequency counter 1981
DC504 Tektronix Plug-in DC504 80 MHz, 5-digit frequency counter 1975
DC505 Tektronix Plug-in DC505 225 MHz counter/timer 1974
DC505A Tektronix Plug-in DC505A 225 MHz counter/timer 1976
DC508 Tektronix Plug-in DC508 1 GHz counter 1978
DC508A Tektronix Plug-in DC508A 1.3 GHz counter 1980
LA501 Tektronix Plug-in LA501 logic analyzer 1976

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