TD253

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The General Electric TD253  (P/N 152-0154-00) is a 10 mA, 9 pF germanium tunnel diode.

It is used in several Tektronix instruments, including the 547 and 7B70. It is specified to have a maximum capacitance of 9 pF.

There is also a TD253A, which has a maximum capacitance of 5 pF and a 190 ps rise time. The TD253B has a capacitance of 2 pF and a 68 ps rise time.

Type Ip
(mA)
Iv max
(mA)
C max
(pF)
Vp
(mV)
Vfs
(mV)
Vf
(mV)
Rs (typ)
(Ω)
tr
(ps)
TD253 10.0 ±10% 1.4 9 75 typ 450 min 500-650 1.7 350
TD253A 10.0 ±10% 1.4 5 80 typ 450 min 500-650 2 190
TD253B 10.0 ±10% 1.4 2 120 max 450 min 500-650 2.5 68

Used in

Some instruments using part TD253

Instrument Manufacturer Class Model Description Introduced
547 Tektronix Oscilloscope 547 50 MHz oscilloscope 1964
7B70 Tektronix Plug-in 7B70 200 MHz Timebase 1969
TU-5 Tektronix Pulse generator TU-5 Tunnel diode pulser (?)