19 high precision resistance and an outstanding ability to reproduce the sensibility index b, make these ranges of products the types of thermistors ideal for temperature measurement applications. leaded or unleaded, these small size and rapid response time thermistors are able to meet the most accurate requirements. types nj 28 np 30 ni 24 nk 20 finish coated chip with phenolic coated chip with epoxy chip resin + varnish coated chip with epoxy awg30 insulated leads + tinned copper wires + silver plated nickel wires marking on packaging only operating temperature -55? to +150? tolerance on rn (25?) ?%, ?%, ?% maximum dissipation at 25? 0.16 w thermal dissipation factor* 3 mw/? 3 mw/? 2 mw/? thermal time constant 8 s 8 s 6 s response time < 2 s ntc accurate thermistors nj 28 ?ni 24 ?nk 20 table of values types rn at 25? ( ? ) material code b (k) at 25? (%/?) n_ _ _ ka 0202 2,000 ka 3625 1% 4.1 n_ _ _ ma 0302 3,000 ma 3960 0.5% ?4.5 n_ _ _ ma 0502 5,000 ma 3960 0.5% ?4.5 n_ _ _ ma 0103 10,000 ma 3960 0.5% ?4.5 n_ _ _ na 0103 10,000 na 4100 1% ?4.6 n_ _ _ pa 0203 20,000 pa 4235 1% 4.8 n_ _ _ qa 0503 50,000 qa 4250 1% ?4.8 n_ _ _ ra 0104 100,000 ra 4380 1% ?4.9 2.8 (.110) max 2.8 (.110) max 35 (1.38) min 3 (.118) max 0.4 (.016) +10 % - 15% 2.4 (.094) max 2.4 (.094) max 35 (1.38) min 3 (.118) max 0.57 (.022) +7% -7% 3.0 (.118) max 3.0 (.118) max 35 (1.38) min 3 (.118) max 0.4 (.016) +10% -15% 0.75 (.030) 0.25 (.010) 1.75 (.069) 0.25 (0.10) 1.75 (.069) 0.25 (0.10) how to order nj28 type ma material code ma (see table above) 0502 resistance 5 k ? f-- tolerance f (?%) * ?= add type as outlined above (example nj 2 8 ). resistance - temperature characteristics: pages 36 to 40. dimensions: millimeters (inches)
20 ntc thermistors manufacturing process nj 28 ?ni 24 ?nk 20
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