Datasheet MLX90247B Datasheet (MELEXIS)

Features and Benefits

Solid state sensor
High reliability
Low cost, small size
On chip temperature sensor

Applications

Non-Contact Temperature Sensing
Differential Temperature Sensing
Climate Control
Ear, Temple Th ermometers
Household and Commercial Appliances

Ordering Information

Part No. Description

MLX90247B Thermopile with On-chip PTC Thermistor

MLX90247B

Thermopile w/On-Chip Thermistor

Functional Diagram

ϑ

+

Description

The MLX90247B is a thermopile sensor IC which
detects very small amounts of heat radiation. The
sensor consists of a membrane with a thermopile on
top of it.
The hot junctions of the thermopile are positioned
near the center of the membrane, 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 sensor IC is integrated together with a PTC
thermistor in one silicon mass. The PTC is adjacent
to the cold junctions of the thermopile. As such, use
of the PTC is considered the more accurate method
of measuring thermopile cold junction temperature,
and thus overall sensor accuracy when making non­contact temperature measurement.

The sensor and thermistor can be used independent
of each other if desired, as the thermopile potential
is floating.

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MLX90247B

Thermopile w/On-Chip Thermistor

MLX90247B Electrical Specifications

DC Operating Parameters TA = -40oC to 150oC, (unless otherwise specified)

Parameter Symbol Test Condition Min Typ Max Unit

Thermopile Resistance Rtp @298K 44 59.5 75
Sensitivity S
TC of Sensitivity TCs @298K 0.1 %/K

Time constant T 30 ms
Thermistor Value Rptc

Thermal Coefficient PTC

(1) 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.

(1)

A1
A2

sensor @298K
black body @299K

@298K
25°C-100°C

29 42 55

18.2 26 33.8
5720 7150

11.57

8580 ppm/K

k

Ω

V/K

µ

k

Ω

ppm/K

2

+

ϑ

MLX90247B Absolute Maximum Ratings

Parameter Value Unit Comment

Operating temperature -40 ~ 150 °C Keep diode leakage in mind at high temperatures
Storage temperature -40 ~ 150 °C
Soldering temperature <220 °C t<5sec

MLX90247B Discrete Infrared Sensor IC Page 2 Rev 1.0 17/Feb/01

Thermopile w/On-Chip Thermistor

MLX90247B Pinout

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 ground / case potential

TO-39 package - connections

1

MLX90247B

2

3

Top view = pins down

ML90247B Mechanical Specifications

Parameter Value Unit Comment

TO-39 specifications

Metal cap Welded
Filling gas Nitrogen

Filter specifications

Transmission >75 %
Transmission <0.5 %

Sensor window

FOV 100 ° Full opening angle: Determined by aperture
Aperture diameter 3.5 mm Default

7.5µ < λ <13.5
0 < λ < 5

4

µ

µ

ESD Precautions

ESD control procedures whenever handling semiconductor devices.

Disclaimer

included herein is believed to be accurate and reliable. However, Melexis assumes no responsibil ity f or its use; nor for
any infringements of patents or other rights of third parties which may result from it’s use.

MLX90247B Discrete Infrared Sensor IC Page 3 Rev 1.0 17/Feb/01

Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe

Melexis reserves the right to periodically make modifications to product specificat i ons. The informatio n

RA (TO-39) Package Outline

MLX90247B

Thermopile w/On-Chip Thermistor

For the latest version of this document,
Go to our website at:

www.melexis.com

Or for additional information
contact Melexis Direct:

USA

Melexis Inc.
41 Locke Road, Concord, NH 03301
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

United Kingdom

Silicon Concepts
PCB Lynchborough Road, Hampshire GU30 7SB, United Kingdom
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

Germany

Schiess-strasse 55, 40549 Düsseldorf, Germany
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

France

Melexis France
Tour Arago, 5 rue Bellini, 92806 Puteaux-La-Défense, France.
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

Italy

Dimacred IRL
Via Papa Giovanni XXIII no. 25, 20046 Biassono, Italy
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

Japan

Thermopile Japan Co., LTD
3-48-10 Ogikubo, Suginami-ku, Tokyo
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

Taiwan

Beechwood Int’l Taiwan Co.
Room 8, 17F, No. 189, Taipei, Taiwan
Phone: [phone] Fax: [phone]
E-mail: [e-mail]

MLX90247B Discrete Infrared Sensor IC Page 4 Rev 1.0 17/Feb/01