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31A3

Sensibly equivalent to:
311SUA 311SU U142 UY41 UY42
    
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The 31A3is a half wave rectifier designed for universal domestic equipment.
See U142 for details.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 60 mm tall.
References: Datasheet & 1040. Type 31A3 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
-
ic
ic
ic
k
h

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
31.0
0.1
250
100
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 12, 2013.
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