TD253
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 Iv,max Cmax Vp Vfs Vf Rs(typ) tr (mA) (mA) (pF) (mV) (ohms) (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
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 | (?) |