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311SU

Sensibly equivalent to:
31A3 U142 UY41
    
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The 311SU is a half wave rectifier designed for universal domestic equipment.
See U142 for more details.
The anode connects to the vertical rod seen on the right.
The anode is formed in an X shape to offer the maximum surface area for cooling.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 59 mm tall.
References: Datasheet & 1040. Type 311SU 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 January 11, 2015.
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