THYRATRON 2D21/5727:

2D21

Page 2

MAXIMUM RATINGS (Continued)
ABSOLUTE MAXIMUM VALUES
Peak Anode Voltage
Inverse.1300....... .......... .... Voits......
Forward .650........ .......... .... Volts......
Cathode Current
Peak.................. 0.5 Amperes
Average....... .................... 0.1 Amperes
Maximum Averaging Time ............................. 30 Seconds
Fault.10........ .... Amperes................
Maximum Duration .......................... .0.1 Seconds
Negative Control-Grid Voltage
Before Conduction. .............. .................. 100 Volts
During Conduction ................. _ ......... .. 10 Volts
Positive Control-Grid Current
Anode Positive.. ......... ......... .... ... 10 Mlimee
Anode Negative .......... ......... ......... ... 10 Milliamperes
Negative Shield-Grid Voltage
Before Conduction. ....... ........ .... ....... .. 100 Volts
During Conduction .......... ......... ......... .. 10 Volts
Positive Shield-Grid Current
Anode Positive ................................... 10 Mlimee
Anode Negative .......................... ... 10 Milliamperes
Heater-Cathode Voltage
Heater Positive with Respect to Cathode ...... .... _ .. ... 25 Volts

Heater Negative with Respect to Cathode. ......... ....... _ .. 100 Volts

Control-Grid Circuit Resistance ............................. 10 Megohms
Ambient Temperature Limits. ......... ....... _ ......-75 to ±90 C

CHARACTERISTICS AND TYPICAL OPERATION

AVERAGE CHARACTERISTICS
Ionization Time, approximate .......... ......... ........ 0.5 Microseconds
Deionization Time, approximate

Ebb= 125 volts d-c, lb=0.1 ampere d-c, Rg = 1000 ohms
Ecci = --100 Volts DC. .............................. 35 Microseconds
Ecci = -11 Volts DC. .............................. ~75 Microseconds

Anode Voltage Drop .......... ......... ......... .. 8 Volts
Critical Grid Current, maximum
Ebb =460 Volts RMS .......... ......... ......... . 0.5 Microamperes