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 | (?) |