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CY31

Sensibly equivalent to:
CV1402 U201
    
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The CY31 is a half wave rectifier on an International Octal Base. The design dates from 1939 and the CY31 was a replacement for the UR1. This design was made with both Ct8 (CY1) and IO bases.
The maximum reservoir capacitor is 32 µF and the minimum series resistance to limit in-rush current is 125 Ohms.
The anode seen face-on shows the wings on either side of the central circular cavity. The anode is blackened to aid radiation.
The classic envelope is 42 mm in diameter and, excluding the IO base pins, is 90 mm tall.
References: Datasheet, 1040 & 1043. Type CY31 was first introduced in 1939.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
20
0.2
250
75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 30, 2013.
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