Features and Benefits
•
•
•
•
Solid state sensor
High reliability
Low cost, small size
On chip temperature sensor
Applications
•
•
•
Gas analysis equipment
IR thermometers
Automotive contactless temperature
sensing.
Ordering Information
Part No
MLX90247
MLX90247
MLX90247
Ta
E
(-20C to +85C)
Suffix
Package code
SF(TO-39)
SF(TO-39)
SF(TO-39)
Type
DSA
DSE
DSG
Description
Thermopile detector with on-chip PTC thermistor, floating
thermopile outputs.
Thermopile detector with high sensitivity NTC thermistor,
floating thermopile outputs.
Thermopile detector with on-chip PTC thermistor,
symmetrical thermopile outputs
E
(-20C to +85C)
E
(-20C to +85C)
•
1. Functional Diagrams
30kOhm
1
1
OutIr+
OutIr+
60kOhm
20uV/K
VSS
4
Thermopile
40uV/K
3
Thermopile
OutIr-
20uV/K
3
30kOhm
OutIr-
2
Rsens
ϑ
+
26kOhm
PTC
Socket
2
100kOhm
Rsens
ϑ
−
4
VSS
NTC
Socket
MLX90247DSG
3901090247
Rev. 002
Page 1 of 11
MLX90247DSE
Data Sheet
Aug/02
1
60kOhm
40uV/K
3
Thermopile
OutIr+
OutIr-
2
Rsens
26kOhm
ϑ
+
4
PTC
Socket
VSS
MLX90247DSA
2. Description
The MLX90247family sensors are thermopile
sensors IC which detects very small amounts of
heat radiation. The sensors consist of a
membrane with a thermopile on top of it.
The hot junctions of the thermopile are
positioned near the center of the membrane and
the cold junctions above the bulk silicon edge.
Due to the low thermal conductivity of the
membrane, absorbed heat will cause the
temperature to increase more at the center of
the membrane than at the edge above the bulk.
This temperature difference is converted to an
electric potential by the thermo-electric effect in
the thermopile junctions. No supply voltage is
needed.
The MLX90247DSG sensor IC is integrated
together with a PTC thermistor. The thermopile
sensor is grounded at the middle point, so that
the output common-mode voltage is at ground
potential. Using grounded thermopile sensor
gives improved EMC susceptibility in some
applications.
The MLX90247DSE sensor IC is packaged
together with a 100k NTC chip thermistor. The
3901090247
Rev. 002
Page 2-2 of 11
Data Sheet
Aug/02
sensor and thermistor can be used independent
of each other if desired, as the thermopile
potential is floating. This type of thermistor has
better sensitivity than the PTC types, but must
be used in smaller ambient ranges. Typical
applications are ear thermometers or other
medical equipment.
The MLX90247DSA sensor IC is integrated
together with a PTC thermistor. The sensor and
thermistor can be used independent of each
other if desired, as the thermopile potential is
floating.
TABLE OF CONTENTS
FEATURES AND BENEFITS .................................................................................................................. 1
APPLICATIONS ...................................................................................................................................... 1
1.
2.
3.
4.
5.
FUNCTIONAL DIAGRAMS ........................................................................................................... 1-1
DESCRIPTION .............................................................................................................................. 2-2
GLOSSARY OF TERMS .................................................................................................................. 4
ABSOLUTE MAXIMUM RATINGS ................................................................................................... 4
MLX90247DSG ................................................................................................................................ 5
5.1.
6.
MLX90247DSG E
LECTRICAL
S
PECIFICATIONS
............................................................................... 5
MLX90247DSE................................................................................................................................. 6
6.1.
MLX90247DSE E
LECTRICAL
S
PECIFICATIONS
............................................................................... 6
7.
MLX90247DSA................................................................................................................................. 7
7.1.
MLX90247DSA E
LECTRICAL
S
PECIFICATIONS
............................................................................... 7
8.
9.
PIN OUT........................................................................................................................................... 8
HOUSING SPECIFICATIONS........................................................................................................... 8
10. PACKAGE OUT ............................................................................................................................... 9
11. RELIABILITY INFORMATION ........................................................................................................ 10
12. ESD PRECAUTIONS...................................................................................................................... 10
13. DISCLAIMER ................................................................................................................................. 11
3901090247
Rev. 002
Page 3 of 11
Data Sheet
Aug/02
PTC :
See Thermistor
3. Glossary of Terms
IR :
Infrared. Every object emits infrared
radiation in relation to its temperature. This
effect can be used to measure the temperature
without the need for physical contact.
NTC :
See Thermistor
Thermistor :
Temperature dependant resistor.
Basically there are 2 types. The types that
increase their resistance with rising temperature
are PTC ( positive thermal coefficient ) types.
The ones that decrease their resistance with
rising temperature we call NTC ( negative
thermal coefficient ) types.
4. Absolute Maximum Ratings
Operating Temperature Range
Operating Temperature Range
Soldering Temperature
-20 ~ 85
°C
-40 ~ 150
°C
< 220
°C
T < 5 sec.
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
3901090247
Rev. 002
Page 4 of 11
Data Sheet
Aug/02
5. MLX90247DSG
5.1. MLX90247DSG Electrical Specifications
DC Operating Parameters T
A
= -20
o
C to 85
o
C, (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Thermopile Resistance
Sensitivity
TC of Sensitivity
Thermistor Value
Thermal Coefficient PTC
(1)
Rtp
S
TCs
Rptc
A1
A2
@298K
sensor @298K
black body @299K
@298K
@298K
25°C-100°C
2
Typ
Max
75
55
Units
kΩ
µV/K
%/K
44
29
0.1
18.2
5720
26
7150
11.57
33.8
8580
kΩ
ppm/K
ppm/K
2
R(T)=R(298K).[1+A1.(T-298K)+A2.(T-298) ]
Note:
when measuring resistances with an ohm meter, please take care that the internal protection diodes, as
indicated in the diagram below, are always reverse biased.
Thermopile
30kOhm
350 Ohm
1
20uV/K
20uV/K
3
30kOhm
350 Ohm
2
26kOhm
ϑ
+
4
Socket
3901090247
Rev. 002
Page 5 of 11
Data Sheet
Aug/02
