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BD21

Rare-gas-filled cold-cathode switching diode for several-ampere pulses, capacitor-discharge high-voltage generators, and ignition applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 9
Nominal heater: -

Description

Rare-gas-filled cold-cathode switching diode for pulsed switching of several amperes, including capacitor-discharge high-voltage pulse and ignition applications.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 9
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 10 A

Cold-cathode switching/relay/display section; device-specific glow-discharge values preserved in parameter table.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 Cerberus

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

BreakdownVoltage
200 V
ArcVoltage
15 V
At 50 mA

Other

Peak Anode Current
10 A
DischargeEnergy
5 J
Per discharge
DischargeFrequency
2 Hz