MLX90247B thermopile w/on-chip thermistor MLX90247B discrete infrared sensor ic page 1 rev 1.0 17/feb/01 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 thermometers household and commercial appliances ordering information part no. description MLX90247B thermopile with on-chip ptc thermistor functional diagram + ? 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 non- contact temperature measurement. the sensor and thermistor can be used independent of each other if desired, as the thermopile potential is floating.
MLX90247B thermopile w/on-chip thermistor MLX90247B discrete infrared sensor ic page 2 rev 1.0 17/feb/01 MLX90247B electrical specifications dc operating parameters t a = -40 o c to 150 o c, (unless otherwise specified) parameter symbol test condition min typ max unit thermopile resistance rtp @298k 44 59.5 75 k ? sensitivity s sensor @298k black body @299k 29 42 55 v/k tc of sensitivity tcs @298k 0.1 %/k time constant t 30 ms 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 (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. + ? 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 thermopile w/on-chip thermistor MLX90247B discrete infrared sensor ic page 3 rev 1.0 17/feb/01 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 1 4 3 2 to-39 package - connections top view = pins down ml90247b mechanical 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 esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe esd control procedures whenever handling semiconductor devices. disclaimer melexis reserves the right to periodically make modifications to product specifications. the information included herein is believed to be accurate and reliable. however, melexis assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from it?s use.
MLX90247B thermopile w/on-chip thermistor MLX90247B discrete infrared sensor ic page 4 rev 1.0 17/feb/01 ra (to-39) package outline 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: +1 603 223 2362 fax: +1 603 223 9614 e-mail: sales_usa@melexis.com united kingdom silicon concepts pcb lynchborough road, hampshire gu30 7sb, united kingdom phone: +44 1428 751 617 fax: +44 1428 751 603 e-mail: sales_uk@melexis.com germany schiess-strasse 55, 40549 dsseldorf, germany phone: +49 211 5360212 fax: +49 211 5360250 e-mail: sales_de@melexis.com france melexis france tour arago, 5 rue bellini, 92806 puteaux-la-dfense, france. phone: +33 1 47 78 11 34 fax: +33 1 47 78 06 35 e-mail: sales_france@melexis.com italy dimacred irl via papa giovanni xxiii no. 25, 20046 biassono, italy phone: +39 039 249 4856 fax: +39 039 491773 e-mail: sales_italy@melexis.com japan thermopile japan co., ltd 3-48-10 ogikubo, suginami-ku, tokyo phone: +81 3 3392 6961 fax: +81 3 3392 6901 e-mail: sales@thermopile.co.jp taiwan beechwood int?l taiwan co. room 8, 17f, no. 189, taipei, taiwan phone: +886 2 2739 3322 fax: +886 2 2739 3090 e-mail: sales_taiwan@melexis.com
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