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U301

Sensibly equivalent to:
CY30
See also:
Valves and their Habits
    
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The U301 is an efficiency diode for television line scan. In use it returns energy from the circuit inductances back to the HT rail and hence to the reservoir capacitor.
The peak inverse voltage is 4500 Volts, the peak anode current is 600 mA with a maximum rectified current of 120 mA. The heater needs very good insulation in these rectifiers and for the U301 the maximum heater - cathode voltage is 4500 Volts. In the envelope the anode is formed as a T with a small circular cavity at the centre junction.
The U301 has a 200 mA heater and the U191 has the same ratings but has a 300 mA heater.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 88 mm tall.
References: Datasheet, 3002 & 1040. Type U301 was first introduced in 1953.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
-
ic
ic
-
a
-
h
h
k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
28.0
0.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 02, 2013.
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