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The 5545 is a Xenon filled Thyratron with reliable operation over a wide temperature range and is the big brother of the 5544 with double the current capacity.

The design use is for speed control of DC motors. Also specified for counting and sorting devices and electronic switching machines.

The filament needs 60 seconds heating time. The Thyratron is a pulse device and the anode volts and current are limiting values the average current is limited to 6.4 Amps. When conducting the forward voltage drop is 16 Volts. The grid can go negative by a maximum of 250 volts. The de-ionisation time is 500 μ seconds.

The other side of the envelope is marked CV2215.

The wide glass tube envelope is 60 mm in diameter, and excluding the 4 special base pins, is 190 mm tall.

Reference: Data-sheet. Type 5545 was first introduced in 1958. See also 1958 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.