cmb 0207 vishay beyschlag document number: 28755 for technical questions, contact: melf@vishay.com www.vishay.com revision: 01-mar-10 67 high pulse load melf resistors cmb 0207 specialty melf resistors with advanced pulse load capability are the perfect choice for the protection of circuitry with signal and mains input lines from surge pulses. the resistors are also suitable for circuits exposed to high levels of electromagnetic in terference or electro-static discharge. the applications are in all fields of automotive, telecommunication, industrial and medical equipment. features ? approved to the safety requirements of iec 60065, 14.1.a* (= vde 0860, 14.1.a) vde-reg.-nr. b583 ? aec-q200 qualified ? special carbon film technology ? up to 10 kv or 17 kw single pulse capability ? up to tbf. continuous pulse load capability ? esd capability: 16 kv, human body model ? compliant to rohs directive 2002/95/ec ? find out more about vishay?s automotive grade product requirements at: www.vishay.com/applications applications ? automotive ? telecommunication ? industrial ? medical equipment notes ? these resistors do not feature a limited lifetime when operated within the permissible limits. however, resistance value drift increasing over operating time may result in exceeding a limit acceptable to the spec ific application, thereby es tablishing a functional lifeti me. (1) the power dissipation on the resistor gener ates a temperature rise against the local ambient, depending on the heatflow support of the printed-circuit board (therma l resistance). the rated dissipat ion applies only if the permitted film temperature is not exceede d. furthermore, a high level of ambient temperature or of po wer dissipation may raise the temperature of the solder joint, hence special solder a lloys or board materials may be required to maintain the reliability of the assembly. (2) specified power rating requires dedicated heat-sink pads. (3) film temperatures above the specified range may be permissible, e.g. 175 c. pl ease contact the factory for details. ** please see document ?vishay material category policy?: www.vishay.com/doc?99902 reg.-nr. b583 metric size din 0207 cecc rc 6123m technical specifications description cmb 0207 cecc size rc 6123m resistance range 2.2 to 1.5 m resistance tolerance 5 %; 2 %; 1 % temperature coefficient see tcr graph operation mode standard power climatic category (lct/uct/days) 55/125/56 55/155/56 rated dissipation, p 70 (1) 0.4 w 1.0 w (2) operating voltage, u max. ac/dc 500 v film temperature (3) 125 c 155 c max. resistance change at p 70 for resistance range, r / r after: 2.2 to 10 k 1000 h 0.5 % 1 % 8000 h 1 % 2 % 225 000 h t.b.f - permissible voltage against ambient (insulation): 1 min; u ins 750 v continuous 75 v failure rate: fit observed 0.1 x 10 -9 /h
cmb 0207 vishay beyschlag high pulse load melf resistors www.vishay.com for technical questions, contact: melf@vishay.com document number: 28755 68 revision: 01-mar-10 dimensions note ? color code marking is appl ied according to iec 60062 (3) in four bands. each color band appears as a single solid line, voids are permissible if at least 2 / 3 of the band is visible from each radial angle of view. the last color band for to lerance is approximatel y 50 % wider than the other bands. an interrupted band between the 2 nd and 3 rd full band indicates the special carbon film type. pattern styles for melf resistors note ? the given solder pad dimensions reflect the considerations for board design and assemb ly as outlined e.g. in standards iec 611 88-5-x, or in publication ipc-7351. they do not guarant ee any supposed thermal properties, however , they will be found adequate for most gene ral applications. dimensions and mass type l (mm) d (mm) l 1 min. (mm) d 1 (mm) k (mm) mass (mg) cmb 0207 5.8 + 0/- 0.15 2.2 + 0/- 0.2 3.2 d + 0/- 0.2 1.15 0.1 79 recommended solder pad dimensions type wave soldering reflow soldering g (mm) y (mm) x (mm) z (mm) g (mm) y (mm) x (mm) z (mm) cmb 0207 2.8 2.1 2.6 7.0 3.2 1.7 2.4 6.6 l 1 k d 1 d l g x y z
cmb 0207 high pulse load melf resistors vishay beyschlag document number: 28755 for technical questions, contact: melf@vishay.com www.vishay.com revision: 01-mar-10 69 note ? products can be ordered usi ng either the part number or the product discription. note (1) please select resistance values for 5 % and 2 % tolerance from the e24 series. part number and product description part number: cmb02070x4701gb200 model/size special character tcr value tolerance packaging special cmb0207 0 = neutral x = no indication 3 digit value 1 digit multiplier multiplier 8 = *10 -2 9 = *10 -1 0 = *10 0 1 = *10 1 2 = *10 2 3 = *10 3 4 = *10 4 j = 5 % g = 2 % f = 1 % b2 b7 up to 2 digits 00 = standard product description: cmb 0207 2 % b2 4k7 cmb 0207 2 % b2 4k7 model size tolerance packaging resistance value cmb 0207 5 % 2 % 1 % b2 b7 100r = 100 4k7 = 4.7 k packaging model blister tape on reel acc. iec 60286-3 diameter pieces/reel code cmb 0207 180 mm/7" 2000 b2 330 mm/13" 7000 b7 tolerance and resistance range description resistance value (1) tolerance cmb 0207 5 % 2.2 to 15 2 % 16 to 1.5 m 1 % 16 to 1 m cmb 02070x4701gb2 00
cmb 0207 vishay beyschlag high pulse load melf resistors www.vishay.com for technical questions, contact: melf@vishay.com document number: 28755 70 revision: 01-mar-10 description production of the cmb 0207 specialty melf resistor is strictly controlled and follows an extensive set of instructions established for reproducib ility. a homogeneous and dense carbon film is deposited on a high grade ceramic body (al 2 o 3 ). nickel plated steel termination caps are firmly pressed on the coated rods. products with a resistance of 15 or lower are made without trimming, whereas a special laser is used to achieve a target value of 16 or above by smoothly cutting a helical groove in the resistive layer without damaging the ceramics. the resistor elements are covered by a protective coat ing designed for electrical, mechanical and climatic protection. the terminations receive a final pure tin on nickel plating. four color code rings designate the resistance value and tolerance in accordance with iec 60 062 (3) . the result of the determined production is verified by an extensive testing procedure performed on 100 % of the individual resistors. only accepted products are laid directly into the blister tape in accordance with iec 60 286-3 (3) . assembly the resistors are suitable for processing on automatic smd assembly systems. they are suitable for automatic soldering using wave, reflow or vapour phase as shown in iec 61760-1 (3) . the encapsulation is resistant to all cleaning solvents commonly used in the electronics industry, including alcohols, esters and aqueous solutions. the suitablility of conformal coatings, if applied, shall be qualified by appropiate means to ensure the long-term stability of the whole syst em. the resistors are rohs compliant, the pure tin plating provides compatibility with lead (pb)-free and lead containing soldering processes. the immunity of the plating against tin whisker growth has been proven under extensive testing. all products comply with the gadsl (1) and the cefic-eeca-eicta (2) list of legal restrictions on hazardous substances. this includes full compliance with the following directives: ? 2000/53/ec end of vehicle life directive (elv) and annex ii (elv ii) ? 2002/95/ec restriction of the use of hazardous substances directive (rohs) ? 2002/96/ec waste electrical and electronic equipment directive (weee) solderability is specified for 2 years after production or requalification. the permitted storage time is 20 years. approvals where applicable the resistors are tested in accordance with en 140401-803 which refers to en 60115-1, en 140400 and the variety of environmental test procedures of the iec 60068 (3) series. vishay beyschlag has achieved ?approval of manufacturer? in accordance with iec qc 001002-3, clause 2 . the release certificate for ?technology approval schedule? in accordance with cecc 240001 based on iec qc 001002-3, clause 6 is granted for the vishay beyschlag manufacturing process. notes (1) global automotive declar able substance list, see www.gadsl.org . (2) cefic (european chemical industry council), eeca (european electronic component manufact urers association), eicta (european tra de organisation representing the information and communi cations technology and cons umer electronics), see www.eicta.org/index.php?id=995 issues environment policy chemicals chemicals for electronics. (3) the quoted iec standards are also released as en st andards with the same number and identical contents.
cmb 0207 high pulse load melf resistors vishay beyschlag document number: 28755 for technical questions, contact: melf@vishay.com www.vishay.com revision: 01-mar-10 71 functional performance c 100 150 - 50 0 50 70 deratin g ambient te mperature amb ? 0 0.5 1 w power dissipation p po w er operation mode (1) standard operation mode note (1) specified po w er rating re qu ires dedicated heat sink pads 1.2/50 pulse resistance value r 1 10 100 1k 10k 100k 1m 10 100 1k 10k v cmb 0207 pulse volta g e u p u lse load rating in accordance w ith iec 60115-1, 4.27; 1.2 s/50 s; 5 p u lses at 12 s inter v als; for permissi b le resistance change 0.5 % 10/700 pulse resistance value r 1 10 100 1k 10k 100k 1m 10 100 1k 10k v cmb 0207 pulse volta g e u p u lse load rating in accordance w ith iec 60115-1, 4.27; 10 s/700 s; 10 p u lses at 1 min u te inter v als; for permissi b le resistance change 0.5 %
cmb 0207 vishay beyschlag high pulse load melf resistors www.vishay.com for technical questions, contact: melf@vishay.com document number: 28755 72 revision: 01-mar-10 historical 12nc information ? the resistors have a 12-digit numeric code starting with 2312. ? the subsequent 4 digits indicate the resistor type, specification and packaging; see the 12nc table. ? the remaining 4 digits indica te the resistance value: - the first 3 digits indicate the resistance value. - the last digit indicates the resistance decade in accordance with the 12nc in dicating resistance decade table. last digit of 12nc indi cating resistance decade historical 12nc example the 12nc of a cmb 0207 resistor, value 47 k with 2 % tolerance, supplied in blister tape of 2000 units per reel was: 2312 199 24703. temperature coefficent (tcr) (typical curve) resistance value r 1 10 100 1k 10k 100k 1m - 500 - 400 - 300 - 200 - 100 0 ppm/k cmb 0207 temperature coefficient alue r current noise a 1 0.01 100 0. 1 1 v / v resistance v current noise - a 1 in accordance w ith iec 60195 1k 10k 100k 1m cmb 0207 resistance decade last digit 1 to 9.99 8 10 to 99.9 9 100 to 999 1 1 k to 9.99 k 2 10 k to 99.9 k 3 100 k to 999 k 4 1 m to 9.99 m 5 historical 12nc - resistor type and packaging description code 2312 ... ..... blister tape on reel type tol. b2 2000 units b7 7000 units cmb 0207 5 % ... 199 3.... ... 189 3.... 2 % ... 199 2.... ... 189 2.... 1 % ... 199 1.... ... 189 1....
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