Western electric 333 a brochure

Page 1

BELL SYSTEM PRACTICES
TRANSMISSION ENGINEERING AND DATA
ELECTRON TUBE DATA

SECTION AB46.333A
ISSUE 1, SEPTEMBER I950
A.T.&T. CO. STANDARD

COLD CATHODE

Western Electric

The 333A is a three-electrode, inert-gas-filled, cold cathode tube for use in relay,
voltage regulator, or rectifier circuits. This tube is especially suitable for use in control
I circuits such as in triggering, counting, or switching apparatus.

DESCRIPTION

MAXIMUM RATINGS

Peak Anode Voltage l . 150 volts

l Average Cathode Current . 10 100 milliamperes
Average Life, approximate 10000 10 hours

. Transfer Current 5 microamperes

ELECTRON TUBE DATA SHEET
FILE: COLD CATHODE SECTION

12-47 3 3 3 A

COLD CATHODE

Page 2

333A - PAGE 2

MAXIMUM RATINGS, Absolute Values

Forward Peak Anode Voltage
Forward Cathode Current

Peak

Average

Averaging Time ,
Peak Inverse Anode Current
Ambient Temperature Limits

ELECTRICAL DATA

Starter Breakdown Voltage*
Starter Voltage Drop at 20 milliamperes
Anode Voltage Drop at 20 milliamperes
Required Transfer Current at 150 Anode Volts (D.C.)
Deionization Time, approximate

Starter Gap

Main Gap . .
Inverse Current at -120 Volts Anode Potential**

MECHANICAL DATA

Mounting Position
Net Weight, approximate

Min. Bogey Max.

62
52
68

5

70
60
75

150

100
35

VIN

-55 to +85

89
74
90

Any
1

volts

milliamperes
milliamperes
seconds
milliamperes
centigrade

volts
volts
volts
microamperes

milliseconds

milliseconds
milliamperes

ounce

* Limits apply immediately after tube has conducted current. If tube has been idle,

these values initially may be as much as 3 volm higher or lower.

W Negame anode voltage applied through 8,000 ohms. Starter CODHEfled to node

through 100,000 ohms.
200

180

160

140

120

100

ANODE VOLTAGE lN VOLTS

80

0 4 8 12 16 20

TRANSFER CURRENT lN MlCROAMPERES

24

28

TRANSFER CURRENT CHARACTERISTIC
(TYPICAL)

32

40