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Datasheet: MLX90247DSE (Melexis, Inc.)

Infrared Sensor ic

 

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3901090247
Page 1 of 11
Data Sheet
Rev. 002
Aug/02
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
Suffix
Part No
Ta
Package code
Type
Description
MLX90247
E
(-20C to +85C)
SF
(TO-39)
DSA
Thermopile detector with on-chip PTC thermistor, floating
thermopile outputs.
MLX90247
E
(-20C to +85C)
SF
(TO-39)
DSE
Thermopile detector with high sensitivity NTC thermistor,
floating thermopile outputs.
MLX90247 E
(-20C to +85C)
SF
(TO-39)
DSG
Thermopile detector with on-chip PTC thermistor,
symmetrical thermopile outputs
1. Functional Diagrams
20uV/K
20uV/K
30kOhm
30kOhm
+
26kOhm
Thermopile
1
4
2
3
Socket
PTC
OutIr+
OutIr-
VSS
Rsens

MLX90247DSG MLX90247DSE
40uV/K
60kOhm
-
100kOhm
Thermopile
1
4
2
3
Socket
NTC
OutIr+
OutIr-
Rsens
VSS
3901090247
Page 2-2 of 11
Data Sheet
Rev. 002
Aug/02


40uV/K
60kOhm
+
26kOhm
Thermopile
1
4
2
3
Socket
PTC
OutIr+
OutIr-
Rsens
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
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.










3901090247
Page 3 of 11
Data Sheet
Rev. 002
Aug/02
TABLE OF CONTENTS
FEATURES AND BENEFITS .................................................................................................................. 1
APPLICATIONS ...................................................................................................................................... 1
1.
FUNCTIONAL DIAGRAMS ........................................................................................................... 1-1
2.
DESCRIPTION .............................................................................................................................. 2-2
3.
GLOSSARY OF TERMS .................................................................................................................. 4
4.
ABSOLUTE MAXIMUM RATINGS ................................................................................................... 4
5.
MLX90247DSG ................................................................................................................................ 5
5.1.
MLX90247DSG
E
LECTRICAL
S
PECIFICATIONS
............................................................................... 5
6.
MLX90247DSE................................................................................................................................. 6
6.1.
MLX90247DSE
E
LECTRICAL
S
PECIFICATIONS
............................................................................... 6
7.
MLX90247DSA................................................................................................................................. 7
7.1.
MLX90247DSA
E
LECTRICAL
S
PECIFICATIONS
............................................................................... 7
8.
PIN OUT........................................................................................................................................... 8
9.
HOUSING SPECIFICATIONS........................................................................................................... 8
10.
PACKAGE OUT ............................................................................................................................... 9
11.
RELIABILITY INFORMATION ........................................................................................................ 10
12.
ESD PRECAUTIONS...................................................................................................................... 10
13.
DISCLAIMER ................................................................................................................................. 11
3901090247
Page 4 of 11
Data Sheet
Rev. 002
Aug/02
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
PTC : 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
-20 ~ 85
C
Operating Temperature Range
-40 ~ 150
C
Soldering Temperature
< 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
Page 5 of 11
Data Sheet
Rev. 002
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
Typ
Max
Units
Thermopile Resistance
Rtp
@298K
44
75
k
Sensitivity
S
sensor @298K
black body @299K
29
55
V/K
TC of Sensitivity
TCs
@298K
0.1
%/K
Thermistor Value
Rptc
@298K
18.2
26
33.8
k
Thermal Coefficient PTC
(1)
A1
A2
25
C-100
C
5720
7150
11.57
8580
ppm/K
ppm/K
2

R(T)=R(298K).[1+A1.(T-298K)+A2.(T-298)
2
]
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.






20uV/K
20uV/K
30kOhm
350 Ohm
30kOhm
350 Ohm
+
26kOhm
Thermopile
1
4
2
3
Socket

3901090247
Page 6 of 11
Data Sheet
Rev. 002
Aug/02
6. MLX90247DSE
6.1. MLX90247DSE Electrical Specifications
DC Operating Parameters T
A
= -20
o
C to 85
o
C, (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Thermopile Resistance
Rtp
@298K
44
75
k
Sensitivity
S
sensor @298K
black body @299K
29
55
V/K
TC of Sensitivity
TCs
@298K
0.1
%/K
Thermistor Value
Rntc
@298K
95
100
105
k
Thermal Coefficient NTC
ntc
0-50
C
(1)
4120
4140
4161
K

Tolerance given between 15
C and 35
C. Typical value corresponds to a relative resistance change of
4.68%/
C. Definition of
is
lnR/
(1/T) with T in K. (Naperian logarithm).
Note:
when measuring resistances with an ohm meter, please take care that the internal protection diodes, as
indicated in the functional diagram below, are always reverse biased.





20uV/K
20uV/K
30kOhm
350 Ohm
30kOhm
350 Ohm
-
100kOhm
Thermopile
1
4
2
3
Socket

3901090247
Page 7 of 11
Data Sheet
Rev. 002
Aug/02
7. MLX90247DSA
7.1. MLX90247DSA Electrical Specifications
DC Operating Parameters T
A
= -20
o
C to 85
o
C, (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Thermopile Resistance
Rtp
@298K
44
75
k
Sensitivity
S
sensor @298K
black body @299K
29
55
V/K
TC of Sensitivity
TCs
@298K
0.1
%/K
Thermistor Value
Rptc
@298K
18.2
26
33.8
k
Thermal Coefficient PTC
(1)
A1
A2
25
C-100
C
5720
7150
11.57
8580
ppm/K
ppm/K
2

R(T)=R(298K).[1+A1.(T-298K)+A2.(T-298)
2
]
Note:
when measuring resistances with an ohm meter, please take care that the internal protection diodes, as
indicated in the functional diagram below, are always reverse biased.




20uV/K
20uV/K
30kOhm
350 Ohm
30kOhm
350 Ohm
+
26kOhm
Thermopile
1
4
2
3
Socket
Rda
3901090247
Page 8 of 11
Data Sheet
Rev. 002
Aug/02
8. Pin Out
1
4
3
2
TO-39 package - connections
Top view = pins down






Pin Symbol
Description
1
OutIr+
Infrared Thermopile positive output
2
Rsens
Thermistor for sensor ambient
temperature measurement
3
OutIr-
Infrared Thermopile negative output
4
Vss
Thermistor and thermopile ground /
case potential

9. Housing specifications
Parameter
Value
Unit
Comment
TO-39 specifications
Metal cap
Welded
Filling gas
Nitrogen
Filter specifications
Transmission
>75
%
7.5
<
<13.5
Transmission
<0.5
%
0 <
< 5
Sensor window
FOV
100
Full opening angle: Determined by aperture
Aperture diameter
3.5
mm
Default
3901090247
Page 9 of 11
Data Sheet
Rev. 002
Aug/02
10. Package Out
























3901090247
Page 10 of 11
Data Sheet
Rev. 002
Aug/02
11. Reliability Information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave
soldering with usual (63/37 SnPb-) solder (melting point at 183degC).
The following test methods are applied:
IPC/JEDEC J-STD-020A (issue April 1999)
Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices
CECC00802 (issue 1994)
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed
Quality
MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102 Solderability

For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.

The application of Wave Soldering for SMD's is allowed only after consulting Melexis regarding assurance
of adhesive strength between device and board.

For more information on manufacturability/solderability see quality page at our website:
http://www.melexis.com/
12. ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.


























3901090247
Page 11 of 11
Data Sheet
Rev. 002
Aug/02
13. Disclaimer

Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in
its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with Melexis for current information.
This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional
processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury,
property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or
use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow
out of Melexis' rendering of technical or other services.
2002 Melexis NV. All rights reserved.


For the latest version of this document, go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
All other locations:
Phone: +32 13 67 04 95
Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com
E-mail: sales_usa@melexis.com




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