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M i c r o C h e m i c a l S y s t e m s
P R O D U C T D A T A S H E E T
MiCS-5131 Product Data Sheet
Page 4 of 5
Doc NO: 0178 Rev. B
Electrical Specifications
Maximum Ratings:
Rating
Symbol
Value / Range
Unit
Maximum Sensor Supply Voltage
VCC
5
V
Maximum Heater Power Dissipation
PH
120
mW
Maximum Sensor Power Dissipation
PS
1
mW
Relative Humidity Range
RH
5
−
95
%RH
Ambient Operating Temperature
Tamb
-40
−
120
°C
Storage Temperature Range
Tsto
-40
−
120
°C
Storage Humidity Range
RHsto
5
−
95
%RH
Table 1
Operating Conditions:
Parameter
Symbol
Typ
Min
Max
Unit
Heating Power, [1]
PH
102
85
120
mW
Heating Voltage,
VH
3.2
-
-
V
Heating Current,
IH
32
-
-
mA
Heating Resistance, [2]
RH
100
90
110
Ω
Table 2
[1]
A minimum value of 85mW ensures sufficient sensitivity to ethanol. Heating powers above 120mW can cause permanent
damage to the sensor when ambient temperatures exceed 120°C.
[2]
Heating resistor values from sensors out of production range between 90 and 110 Ohm. Due to material properties of the
heating resistor its value increases during operating life. This behavior has to be taken into account in the application
design.
Sensitivity Characteristics:
Characteristic
Symbol
Typ
Min
Max
Unit
Ethanol Detection Range
FS
10
1000
ppm
Sensing Resistance in air [3]
R0
24
18
180
k
Ω
Sensitivity Factor [4]
SR
1.4
1.3
1.8
-
Table 3
[3]
Sensing Resistance in air R0 is measured under controlled ambient conditions, i.e. synthetic air at 23±2°C and 50±5 %RH.
[4]
Sensitivity Factor SR is defined as RS at 60ppm of CO divided by RS at 200ppm of CO. Test conditions are 50±5 %RH and
23±2°C.
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