Western electric 354 a brochure

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BELL SYSTEM PRACTICES SECTION AB46.354A
Transmission Engineering and Data Issue 3, October 1962
Electron Tube Data A.T.& T.Coe Standard

ELECTRON TUBE DATA SHEET

WESTERN ELECTRIC 354A ELECTRON TUBE

ngmmou ,
The 35LA is a three-electro

firy-vapor thyratron with a negative control

characteristicf ube is ~esigned for regulated or controlled rectifiers.

FILE : THYRATRON SECTION

(:) American Telephone and Telegraph Company 1962

. . ........ . ...... 1500.volts

h amperes

354A

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BSLA - Page 2
MAXIMUM RATINGS, ABSOLUTE VALUE

Peak Anode Voltage

Inverse . . . . . . . . . . . . . . . . . . . . . . . . 1500 volts

Forward . . . . . . . . . . . . . . . . . . . . . . . . 1500 volts
Cathode Current

Peak . . . . . . . . . . . . . . . . . . . . . . . . . 16 amperes

Average . . . . . . . . . . . . . . . . . . . . . . . . L amperes

Surge (maximum duration 0.1 second) . . . . . . . . . . 160 amperes

Averaging Time . . . . . . . . . . . . . . . . . . . . 15 seconds
Negative Grid Voltage .

Before Conduction . . . . . . . . . . . . . . . . . . . 500 volts

During Conduction . . . . . . . . . . . . . . . . . . . 10 volts
Positive Grid Current, Average

(Averaging time - one cycle) . . . . , ....... . 0.050 ampere
Condensed Mercury Temperature Limits ........... +30 to +70 centigrade

ELECTRICAL DATA

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Filament Voltage . . . . . . . . . . . . . . . . 2.37 2.5 2.62 volts

Filament Current at 2.5 Volts . . . . . . . . . -e-- 16 17.5 amperes
Filament Heating Time Required . . . . . . . . . L5 ---- ---- seconds
Anode to Grid Capacitance . . . . . . . . . . . ---- 1.L ---- uuf.
Grid to Filament Capacitance . . . . . . . . . . ---- 8 ---- uuf.

Deionization Time. Approximate
E b'1500 volts;Ib-16 amperes;. . . . . . . . . ---- 2500 ---- microseconds
Ecc--25 volts:TEg-800;Rg-ZOOOO ohms . . . . .

Ionization Time, Approximate2 . . . . . . . . .

Ebb-100 volts;THg-LOC;Grid Overvoltags-5 volts ---- 75 ~--- microseconds

Ebb-100 volts;THg-BOC;Grid 0vervoltage-25 volts ---- l ---- microsecond
Anode Voltage Drop . . . . . . . . . . . . . . . ---- 15 ---- volts
Critical Grid Current at 220 Anode Volts . . . . ---- ---- 5 sicroamperas

MECHANICAL DATA

Type of Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . Convection

Equilibrium Condensed lercury Temperature
Rise Above Ambient

At Full Load (approximate). . . . . . . . . . . . . . . . . 25 Centigrade

at No Load (approximate), , . . . . . . . . . . . . . . . . l5 Centigrade
Mounting Position . . . . . . . . . . . . . . . . . . . . Vertical - base down
Net Weight, Approximate . . . . . . . . . . . . . . . . . . 8 ounces

Dimensions and pin connections shown in outline drawing on Page A

1. Deionization time decreases with an increase in negative grid voltage
or with a decrease in (a) condensed mercury temperature (THg), (b) grid
resistance or (c) anode current immediately preceding the end of conduction.

2. Ionization time decreases with an increase in (a) anode voltage, (b) condensed
mercury temperature (Tag) or (c) grid evervoltage. Grid overvoltage is defined
as the magnitude by which the applied voltage exceeds, in a positive direction,
the critical grid voltage value. Critical grid voltage is the instantaneous
value of grid voltage at the time vhen anode current starts to flow.