Western electric 405 a brochure

Page 1

BELL SYSTEM PRACTICES fl

Transmission Engineering Data
Vacuum Tube Data

SECTION AB 46.405A
Issue 2, January 1950
A.T.&T. Co. Standard

COLD CATHODE Western Electric

DESCRIPTION

The 405A is a three-electrode, inert-gas- apparatus. This tube, because of its small
filled, cold cathode tube for use primarily size, flexible connector leads and ease in
as a relay in communication circuits. It is mounting, may be used to advantage 'in
also suitable for use in control circuits equipment where space is a factor.

such as in triggering, counting or switching

MAXIMUM RATINGS

Peak Anode Voltage . . . . . . . t . ..... 165 volts
Average Cathode Current . . . . . . . . . . 4 40 milliamperes
Average Life . . . . . . . . . . . . . 10000 10 hours

ELECTRON TUBE DATA SHEET

FILE: COLD CATHODE SECTION
5.49 405A

COLD CATHODE

Page 2

405A-PAGE 2
MAXIMUM RATINGS, Absolute Values

Peak Anode Voltage

Forward . . . . . . . . . . . . . . 1$ volts

Inverse . . . . . . . . . . . 165 volts
Forward Cathode Current

Peak . . . . . . . . . . . . . . . 40 milliamperes

Average . . . . . . . . . . . . . . 15 milliamperes

Averaging Time . . . . . . . . . . . 1 second
Peak Inverse Anode Current . . . . . . . . . 1 milliampere
Ambient Temperature Limits . . -. . . . . . . -55 to +85 centigrade

ELECTRICAL DATA
Min. Bogey Max.

Starter Breakdown Voltage' . . . . . . . 67 75 89 volts
Starter Voltage Drop at 10 milliamperes . . . . . 52 60 74 volts
Anode Voltage Drop at 10 milliamperes. . . 66 75 90 volts
Required Transfer Current at 130 Anode Volts (D. C. ) . 50 . . . . . . microamperes
Deionization Time, Approximate
Starter Gap 2 milliseconds
Main Gap . 8 . milliseconds

MECHANICAL DATA

MountingPosition.........,.,.....Any
Net Weight, Approximate . . . . . .. . . . . . . . . 0.4 ounce

Limits apply immediately after tube has conducted current. It tube
has been idle, these values may be as much u 3 volt! higher or lower.

:60 TRANSFER CURRENT CHARACTERlSTlC
. ; (TYPICAL)

150
140
130

120

ANODE VOLTAGE IN VOLTS

IlO

9O
0 IO 20 30 40 50 60

TRANSFER CURRENT IN MICROAMPERES