2N2207

The 2N2207  (P/N 151-063,151-0063-00) is a germanium PNP transistor with

• f_t= 140 MHz
• I_C (max) = 50 mA
• h_fe (min) = 36

The 2N2207 is used in a variety of 1960s Tektronix equipment including the 3B1, 3B3, 3S76, 321A, and 547.

Due to tin whiskers growing inside the case, 2N2207s are a common source of problems on equipment of the period. For more information, see the Germanium transistors page.

In most (but not all) circuits, a failed 2N2207 can be replaced with a modern silicon PNP transistor. Such a replacement may need to involve several coupled transistors/diodes (see link for an example).

Some instruments using part 2N2207

Instrument	Manufacturer	Class	Model	Description	Introduced
321A	Tektronix	Oscilloscope	321A	Portable single channel scope	1964
3B1	Tektronix	Plug-in	3B1	10 MHz time base plug-in	1962
3B3	Tektronix	Plug-in	3B3	Time Base plug-in	1962
3S76	Tektronix	Plug-in	3S76	Dual Channel Sampling plug-in	1962
547	Tektronix	Oscilloscope	547	50 MHz oscilloscope	1964

Links

• 321A 2N2207 transistor replacement
• https://nepp.nasa.gov/whisker/anecdote/af114-transistor/index.html

Pictures

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  2N2207 with pins labeled

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