DATA SHEET /4/6... NTC thermistors, accuracy line. BCcomponents

Transcription

1 DATA SHEET /4/6... NTC thermistors, accuracy line Supersedes data of September 4th 1998 File under BCcomponents, BC Sep 27

2 FEATURES Accuracy over a wide temperature range High stability over a long life Excellent price/performance ratio. APPLICATION Temperature sensing and control. DESCRIPTION These thermistors have a negative temperature coefficient. The device consists of a chip with two tinned solid copper-plated leads. It is grey lacquered and colour coded, but not insulated. QUICK REFERENCE DATA PARAMETER VALUE Resistance value at 25 C 3.3 Ω to 470 kω Tolerance on -value ±2%; ±3%; ±5%; ±10% Tolerance on B 25/85 -value ±0.5% to ±3% Maximum dissipation 500 mw Response time 1.2 s Operating temperature range: at zero dissipation; continuously 40 to +125 C at zero dissipation; for short periods 150 C at maximum dissipation (500 mw) 0 to 55 C Climatic category 40/125/56 Mass 0.22 g MARKING The thermistors are marked with colour bands in accordance with Fig.1 and Table 2. MOUNTING By soldering in any position Sep 27 2

3 MECHANICAL DATA Outline B T ΛΙ ΙΙΙ ΙΙ Ι H 2 H 1 L P d CCB281 For dimensions see Table 1. Fig.1 Component outline to Table 1 Physical dimensions for relevant type; see Fig.1 CODE NUMBER B max (mm) d (mm) H 1 (mm) H 2 max (mm) L (mm) P (mm) MIN. MAX to ± ± ± ± to ± ± T max (mm) 2001 Sep 27 3

4 ORDERING INFORMATION Table 2 -values, catalogue numbers and coding (Ω) B 25/85 -VALUE COLOUR CODE CATALOGUE NUMBER (see Fig.1 and note 1) ±2% ±3% ±5% ±10% I II III K ±3% orange orange gold K ±3% yellow violet gold K ±3% blue grey gold K ±3% brown black black K ±3% brown green black K ±3% red red black K ±3% orange orange black K ±3% yellow violet black K ±3% blue grey black K ±0.75% brown black brown K ±0.75% brown green brown K ±0.75% red red brown K ±0.75% orange orange brown K ±0.5% yellow violet brown K ±0.5% blue grey brown K ±0.5% brown black red K ±0.5% brown green red K ±0.5% red black red K ±0.75% red red red K ±0.75% red violet red K ±0.75% orange orange red K ±0.75% yellow violet red K ±0.75% blue grey red 2001 Sep 27 4

5 (Ω) B 25/85 -VALUE K ±0.75% brown black orange K ±2% brown red orange K ±2% brown green orange K ±2% red red orange K ±1.5% orange orange orange K ±1.5% yellow violet orange K ±1.5% blue grey orange K ±1.5% brown black yellow K ±2.5% brown green yellow K ±2.5% red red yellow K ±1.5% orange orange yellow K ±1.5% yellow violet yellow Note 1. Dependent upon -tolerance, the band IV is coloured as follows: a) for ±2%, band IV is coloured red b) for ±3%, band IV is coloured orange c) for ±5%, band IV is coloured gold d) for ±10%, band IV is coloured silver. COLOUR CODE CATALOGUE NUMBER (see Fig.1 and note 1) ±2% ±3% ±5% ±10% I II III 2001 Sep 27 5

6 R T value and tolerance These thermistors have a narrow tolerance on the B-value, the result of which provides a very small tolerance on the nominal resistance value over a wide temperature range. For this reason the usual graphs of R = f(t) are replaced by Tables 4 through 16, together with a formula to calculate the characteristics with a high precision. Formulae to determine nominal resistance values (1) The resistance values at intermediate temperatures, or the operating temperature values, can be calculated using the following interpolation laws (extended Steinhart and Hart ): R (T) = R ref e A + B T + C T2 + D T 3 (1) T (R) = R A 1 + B 1 ln C (2) R 1 ln R + D ref R 1 ln R 1 ref R ref where: A, B, C, D, A 1, B 1, C 1 and D 1 are constant values depending on the material concerned; see Table 3. R ref is the resistance value at a reference temperature (in this event 25 C). T is the temperature in K. (1) Formulae numbered (1) and (2) are interchangeable with an error of max C in the range 25 C to125 C and max C in the range 40 C to+25 C. Determination of the resistance/temperature deviation from nominal value The total resistance deviation is obtained by combining the -tolerance and the resistance deviation due to B-tolerance. When: X= -tolerance Y = resistance deviation due to B-tolerance Z = complete resistance deviation, then: Z X Y = % or Z X+Y. When: TC = temperature coefficient T = temperature deviation, then: T Z = TC The temperature tolerances are plotted in Figs 3, 4, 5, 6, 7 and 8. Example: at 0 C, assume X = 5%, Y = 0.89% and TC = 5.08%/K (see Table 11), then: 5 Z = % = { } 100% = % ( 5.93% ) Z 5.93 T = = = C ( 1.17 C) TC 5.08 A NTC with a -value of 10 kω has a value of kω between 1.17 and C Sep 27 6

7 Table 3 Parameters for determining nominal resistance values B 25/85 -VALUE (K) A Notes 1. Temperature < 25 C. 2. Temperature 25 C. B (K) C (10 5 K 2 ) D (10 6 K 3 ) A 1 (10 3 ) B 1 (10 4 K 1 ) C 1 (10 6 K 2 ) D 1 (10 7 K 3 ) (1) (2) Sep 27 7

8 Table 4 Resistance values at intermediate temperatures T oper ( C) R T / R DUE TO B-TOLERANCE (%) TC (%/K) (Ω) ; see Table 16, note Sep 27 8

15 Table 11 Resistance values at intermediate temperatures T oper ( C) R T / R DUE TO B-TOLERANCE (%) TC (%/K) (kω) ; see Table 16, note Sep 27 15

20 Table 16 Resistance values at intermediate temperatures T oper ( C) R T / R DUE TO B-TOLERANCE (%) TC (%/K) (kω) ; see note Note to Tables 4 through Replace dot in last 5 digits of catalogue number by a number according to the following details and depending on tolerance on required -value: 4 for a tolerance of ±2%; 6 for a tolerance of ±3%; 3 for a tolerance of ±5%; 2 for a tolerance of ±10% Sep 27 20

21 ELECTRICAL CHARACTERISTICS Unless otherwise stated, measurements are in accordance with IEC publication 60539, see also Table 2. Stability is in accordance with CECC and IEC , see Table 20. PARAMETER VALUE Standard selection tolerance on ±2%; ±3%; ±5% and ±10% Climatic category 40/125/56 Maximum dissipation 500 mw Dissipation factor δ (for information only) 7 mw/k Response time (for information only); note s Thermal time constant τ (for information only) 11 s Operating temperature range: at zero dissipation; continuously 40 to +125 C at zero dissipation 150 C at maximum dissipation 0 to +55 C Note 1. Response time in silicone oil MS200/50. This is the time needed for the sensor to reach 63.2% of the total temperature difference when subjected to a temperature change from 25 C in air to 85 C in oil. Derating P (%) 100 MLC o T amb ( C) Fig.2 Power derating curve Sep 27 21

22 3.0 T (K) MLC T (K) MLC o T ( C) Curves valid for 2.2 to 10 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Curve 4: / = 1% (for series only) o T ( C) Curves valid for 12 to 22 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Fig.3 Temperature deviation as a function of the ambient temperature. Fig.4 Temperature deviation as a function of the ambient temperature. T (K) MLC379 1 T (K) MLC o T ( C) Curves valid for 33 to 47 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Curve 4: / = 1% (for series only) o T ( C) Curves valid for 68 to 100 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Curve 4: / = 1% (for series only). Fig.5 Temperature deviation as a function of the ambient temperature. Fig.6 Temperature deviation as a function of the ambient temperature Sep 27 22

23 T (K) MLC T (K) MLC o T ( C) o T ( C) Curves valid for 150 to 220 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Curves valid for 330 to 470 kω. Curve 1: / =5%. Curve 2: / =3%. Curve 3: / =2%. Fig.7 Temperature deviation as a function of the ambient temperature. Fig.8 Temperature deviation as a function of the ambient temperature Sep 27 23

24 PACKAGING Table 17 Code numbers and relevant packaging quantities Note 1. The maximum number of empty places per reel shall not exceed 0.5% of the total number of components per reel. No more than three consecutive positions may be vacant. Tape specifications TAPE AND REEL (1) 1e pitch TAPE AND REEL (1) 2e pitch BULK PARAMETER Quantity per reel, 2 reels per box 1500 per reel, 2 reels per box P T D p p h h O d H H 1 W 2 W 1 L W W 0 A D 0 P 0 P 1 F direction of unreeling detail A t MSA208 1E pitch For dimensions, see Table 18. Fig.9 Thermistors on tape Sep 27 24

25 Table 18 Dimensions of tape in accordance with IEC ; see Fig.9 SYMBOL PARAMETER DIMENSIONS (mm) VALUE TOLERANCE D body diameter T maximum total thickness 3 d lead diameter 0.6 ±0.06 P pitch between thermistors 12.7 ±1 P 0 feed-hole pitch (cumulative pitch error ±0.2 mm/20 products) 12.7 ±0.3 P 1 feed-hole centre to lead centre 5.08 ±0.7 p component alignment 0 ±1.3 F lead-to-lead distance 2.54 ±0.3 h component alignment 0 ±2 W tape width / 0.5 W 0 hold-down tape width 12.5 W 1 feed-hole position 9.0 ±0.5 W 2 hold-down tape position 3 H component to tape centre 22 1 H 1 component height 32 (1) L length of snipped lead 11 D 0 feed-hole diameter 4.0 ±0.2 t total tape thickness with cardboard tape 0.5 ±0.1 mm 0.65 ±0.2 AQL: mechanical level 11 1% Note 1. Taped products with H 1 = / 0 mm, are available on request Sep 27 25

26 P T D p p h h 10 max W 2 O d W 1 L H 0 H W W 0 A D 0 F P 0 P 1 direction of unreeling t detail A MSA209 2E pitch For dimensions, see Table 19. Fig.10 Thermistors on tape Sep 27 26

27 Table 19 Dimensions of tape in accordance with IEC ; ; see Fig.10 SYMBOL PARAMETER DIMENSIONS (mm) VALUE TOLERANCE D body diameter T maximum total thickness 3.2 d lead diameter 0.6 ±0.06 P pitch between thermistors 12.7 ±1 P 0 feed-hole pitch (cumulative pitch error ±0.2 mm/20 products) 12.7 ±0.3 P 1 feed-hole centre to lead centre 3.85 ±0.7 p component alignment 0 ±1.3 F lead-to-lead distance 2.54 ±0.3 h component alignment 0 ±2 W tape width / 0.5 W 0 hold-down tape width 12.5 W 1 feed-hole position / 0.5 W 2 hold-down tape position 3 H component to tape centre 20 1 H 0 lead wire clinch height 16 ±0.5 L length of snipped lead 11 D 0 feed-hole diameter 4.0 ±0.3 t total tape thickness with cardboard tape 0.5 ±0.1 mm 0.7 ±0.2 AQL: mechanical level 11 1% 2001 Sep 27 27

28 Reel specifications max ±1 56 max JW113 Fig.11 Dimensions of the reel. CHARACTERISTICS OF TAPED PRODUCTS Minimum pull-out force of the component: 5 N. Minimum peel-off force of adhesive tape: 6N. Minimum tearing force tape: 15 N. Minimum pull-off force of tape-reel: 5 N. STORAGE CONDITIONS Storage temperature range: 25 to +40 C. Maximum relative humidity: 80 C Sep 27 28

29 TESTS AND REQUIREMENTS Essentially all tests are carried out in accordance with IEC publication ; Environmental testing, except where indicated. Table 20 Stability tests CECC CLAUSE IEC TEST METHOD Notes 1. For 100 kω the drift requirement is R/R < 5%. 2. For from 2.2 kω to 10 kω, requirement is ±2% max. TEST PROCEDURE REQUIREMENTS D3; endurance 25 C; 1000 hours R/R < 1% 1 endurance 40 C; 1000 hours R/R < 1% 539 endurance 500 mw; 55 C; 1000 hours R/R < 3% (note 1) 2 dry heat, 125 C; 1000 hours R/R < 3% (steady state) D1; damp heat 56 days at 40 C; 90 to 95% RH R/R < 3% (steady state) C2; rapid change of temperature 40 C to +125 C; 50 cycles R/R < 2% Other applicable tests 21 robustness of leads: R/R 1% tensile strength loading force 10 N bending loading force 5 N 58 soldering: R/R 1% (note 2) solderability 240 C max.; duration 4 s max. resistance to heat 265 C max.; duration 5 s max. 27 impact free fall; 1 m R/R 1% 29 shock 490 m/s; half sinewave R/R 1% 45 resistance to solvent (isopropanol) ambient temp for 5 min; 5 N with hydrophylic cotton wool 6 vibration 1.5 mm peak to peak: 10 to 58 Hz 10 gp: 50 to 500 Hz 1 octave/min. 2 hours in each direction in three orthogonal directions no traces of lacquer on cotton wool no visible damage R/R < 1% 2 inflammability 1980, needle flame test non-flammable 2001 Sep 27 29