66 05/02 applications automotive electronics, e.g. measurement of cooling water and oil temperature features thermistor disk with lapped, coplanar front surfaces front surfaces silver-plated for clamp contacting ul approved type (up to 125 c operating temperature) options alternative resistance ratings, rated temperatures and resistance tolerances available on request delivery mode bulk climatic category (iec 60068-1) max. power at 25 c p 25 resistance tolerance ? r n / r n rated temperature t n b value tolerance ? b / b dissipation factor (in air) th 1) thermal cooling time constant (in air) c 1) heat capacity c th 1) 55/250/21 180 5 % 20 1,5 % approx. 2,5 approx. 12 approx. 30 mw c mw/k s mj/k r 20 ? r 25 ? no. of r / t characteristic b 25/100 k ordering code 2,5 k 2056,9 1008 3560 B57220k0212a003 d = 2,9 0,3 mm l = 1,3 0,3 mm approx. weight 50 mg termination 1) depends on mounting situation B57220 temperature measurement k220 leadless disks
67 05/02 reliability data test standard test conditions ? r 25 / r 25 (typ.) remarks storage in dry heat iec 60068-2-2 storage at upper category tem- perature t : 250 c t : 1000 h < 3 % no visible damage storage in damp heat, steady state iec 60068-2-3 temperature of air: 40 c relative humidity of air: 93 % duration: 21 days < 3 % no visible damage rapid temperature cycling iec 60068-2-14 lower test temperature: 55 c upper test temperature: 155 c number of cycles: 100 < 3 % no visible damage endurance p max : 180 mw t : 1000 h < 3 % no visible damage long-term stability (empirical value) temperature: 125 c t : 10 000 h < 5 % no visible damage B57220 temperature measurement k220 leadless disks
herausgegeben von epcos ag unternehmenskommunikation, postfach 80 17 09, 81617 mnchen, deutschland ++49 89 636 09, fax (0 89) 636-2 26 89 ? epcos ag 2002. vervielf?ltigung, ver?ffentlichung, verbreitung und verwertung dieser broschre und ihres inhalts ohne aus- drckliche genehmigung der epcos ag nicht gestattet. bestellungen unterliegen den vom zvei empfohlenen allgemeinen lieferbedingungen fr erzeugnisse und leistungen der elek- troindustrie, soweit nichts anderes vereinbart wird. diese broschre ersetzt die vorige ausgabe. fragen ber technik, preise und lieferm?glichkeiten rich ten sie bitte an den ihnen n?chstgelegenen vertrieb der epcos ag oder an unsere vertriebsgesellschaften im ausland. bauelemente k?nnen aufgrund technischer erfordernisse gefahrstoffe ent- halten. ausknfte darber bitten wir unter angabe des betreffenden typs ebenfalls ber die zust?ndige vertriebsgesellschaft ein - zuholen. published by epcos ag corporate communications, p.o. box 80 17 09, 81617 munich, germany ++49 89 636 09, fax (0 89) 636-2 26 89 ? epcos ag 2002. reproduction, publication and dissemination of this brochure and the information contained therein without epcos? prior express consent is prohibited. purchase orders are subject to the general conditions for the s upply of products and services of the electrical and electronics industry recommended by the zvei (german electrical and el ectronic manufacturers? associ ation), unless otherwise agreed. this brochure replaces the previous edition. for questions on technology, prices and delivery please contact the sales offices of epcos ag or the international representa- tives. due to technical requirements components may contain dangerous substances. for information on the type in question please also contact one of our sales offices.
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