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La r g e a p e r t u r e t h e r m o p i l e d e t e c t o r w i t h o n-c h i p P T C t h e r m i s t o r ,
f l o a t i ng t h e r m o p i l e o u t p u t s . 3. 5 m m a p e r t u r e
MLX90247 family
Discrete Infrared Thermopile Detectors
Features and Benefits
Solid state thermopile sensor
On-chip thermistor for ambient temperature compensation
High reliability and long-term stability
Low cost, small size
Ordering Information
Suffix
P a rt N o T a P a c k a g e c o d e T y p e D e s c r ip t io n
MLX90247 E (-40C to +85C) SF (TO-39) D SA
Notice: In case sensor is used in automotive applications, Melexis must be informed.
Applications
Automotive contactless temperature sensing.
IR thermometers
Gas analysis equipment
Occupancy detection
1. Functional Diagram
2. Description
60 kOhm
40 uV/K
Thermopile
24 kOhm
PTC
Socket
1 Out IR+
3 Out IR-
2 Rsense
4 VSS
At the heart of the MLX90247 thermopile sensors is a
silicon die with a central micromachined membrane
surrounded by a bulk silicon edge. The hot junctions of the
thermopile are positioned near the center of the membrane
and the cold junctions are located above the bulk silicon
edge. Infrared irradiation of the low thermal conductivity
membrane creates a temperature difference between the
membrane and the surrounding bulk silicon. The resulting
thermopile voltage is a function of the temperature
difference between the object and the sensor.
Measurement of the absolute temperature of the object is
possible by relating the thermopile signal to the
temperature of the sensor. The exact temperature of the
sensor is measured by a PTC thermistor integrated in the
bulk silicon edge. No supply voltage is needed for the
thermopile.
The sensor and thermistor can be used independently of
each other if desired, as the thermopile potential is floating.
3901090247
Rev. 004
Page 1 of 9
Data Sheet
Oct/07
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