Datasheet

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your own switch configuration. All the multiplexer switches have a relay counter to help predict when
relays need to be replaced.
NOTE: The 34923A and 34924A have 100 ohm input protection resistors that limit current and protect the
reed relays.
Multiplexer switch modules
34921A
34922A
34923A
34924A
34925A
Channels/configurations
40 2-wire
20 4-wire
4-current
1.5 A Fused
70 2-wire
35 4-wire
80 1-wire
40 2-wire
20 4-wire
70 2-wire
35 4-wire
80 1-wire
40 2-wire
20 4-wire
Switch type
Armature
latching
Armature
latching
Reed
Reed
Optically
isolated FET
Input characteristics (per channel)
Max volts
± 300 V
1
± 300 V
1
± 150 V peak
2
± 150 V peak
2
± 80 V peak
2
Max current (DC, AC RMS)
Switch current
1 A
1 A
0.5 A
5
/ 0.05 A
11
0.5 A
5
/ 0.05 A
11
0.02 A
8
Carry current
2 A
2 A
1.5 A
5
/ 0.05 A
11
1.5 A
5
/ 0.05 A
11
Power (W, VA) 6
60 W
60 W
10 W
10 W
1.6 W
Volt-Hertz limit
108
108
108
108
107
Initial closed channel res 3, 12
< 1.5 Ω
< 1.5 Ω
< 1.5 Ω
5
/200
11
nominal
< 1.5 Ω
5
/200
11
Nominal
< 700 Ω
General specifications
Offset voltage
3
< 3 μV
< 3 μV
< 50 μV
< 100 uV 1-wire
< 50 uV
< 3 μV
DC Isolation (ch-ch, ch-earth)
>10 GΩ
>10 GΩ
>10 GΩ >
10 GΩ
>10 GΩ
Leakage current
3
N/A
N/A
N/A
N/A
20 nA
9
T/C cold junction accuracy
3, 10
< 1°C
N/A
N/A
N/A
N/A
Figure 4: 34923A 40 channel reed
multiplexer (bank 1 shown)
Figure 3: 34925A 40/80-channel optically
isolated FET mux (shown in 1-wire mode