2N4851

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

Data

• Motorola 2N4851, 2N4852, 2N4853 data sheet