BCcomponents DATA SHEET MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Product specification Supersedes data of 8th June 2001 File under BCcomponents, BC08 2002 Nov 19 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors FEATURES 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 or bulk case in accordance with IEC 60 286-6. * Advanced thin film technology * Power dissipation rating up to 1 W * Excellent overall stability: Class 0,25 * Wide professional range: 0,1 W to 10 MW The resistors are suitable for processing on automatic SMD assembly systems. They are suitable for automatic soldering using wave, reflow or vapour phase. Excellent solderability is proven, even after extended storage in excess of 10 years. The encapsulation is resistant to all cleaning solvents commonly used in the electronics industry, including alcohols, esters and aqueous solutions. * Green product, supports lead-free soldering. Metric sizes DIN: 0102 0204 0207 CECC: RC 2211M RC 3715M RC 6123M The resistors are completely lead-free, the pure tin plating provides compatibility with lead-free soldering processes. The immunity of the plating against tin whisker growth has been proven under extensive testing. All products comply with the CEFIC-EECA-EICTA list of legal restrictions on hazardous substances. APPLICATIONS * Automotive * Telecommunication * Industrial * Medical equipment. The resistors are tested in accordance with EN 140 401-803 (superseding CECC 40 401-803) which refers to EN 60115-1 and EN140 400. Approval of conformity is indicated by the CECC logo on the package label. DESCRIPTION MMU 0102, MMA 0204 and MMB 0207 professional thin film MELF resistors are the perfect choice for most fields of modern professional electronics where reliability and stability is of major concern. The typical applications in the fields of automotive, telecommunication and medical equipment reflect the outstanding level of proven reliability. BCcomponents BEYSCHLAG has achieved "Approval of Manufacturer" in accordance with EN 100 114-1. The release certificate for "Technology Approval Schedule" in accordance with CECC 240 001 based on EN 100 114-6 is granted for the BCcomponents BEYSCHLAG manufacturing process. Production is strictly controlled and follows an extensive set of instructions established for reproducibility. A homogeneous film of metal alloy is deposited on a high grade ceramic body (85% Al2O3, for MICRO-MELF: 96% Al2O3) and conditioned to achieve the desired temperature coefficient. Nickel plated steel termination caps are firmly pressed on the metallised rods. A special laser is used to achieve the target value by smoothly cutting a helical groove in the resistive layer without damaging the ceramics. The resistor elements are covered by a protective coating designed for electrical, mechanical and climatic protection. The terminations receive a final pure tin on nickel plating. Four or five colour code rings designate the resistance value and tolerance in accordance with IEC 60 062. 2002 Nov 19 This product family of thin film MELF resistors is completed by Zero Ohm Jumpers. On request, resistors are available with established reliability in accordance with EN 140 101-803 Version E. Please refer to the special data sheet for information on failure rate level, available resistance ranges and ordering codes. 2 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors QUICK REFERENCE DATA DESCRIPTION MMU 0102 CECC size Resistance range Resistance tolerance Climatic category (LCT/UCT/days) Rated dissipation, P70(1) RC 2211M RC 3715M RC 6123M 0,22 W to 10 MW 0,1 W to 8,2 MW 5%; 2%; 1%; 0,5% 5%; 1%; 0,5% 50 ppm/K; 25 ppm/K Max. resistance change at P70 for resistance range, DR/R max., after: 5%; 2%; 1%; 0,5% 100 ppm/K; 50 ppm/K; 25 ppm/K standard power standard power standard power 55/125/56 55/155/56 55/125/56 55/155/56 55/125/56 55/155/56 0,2 W 0,3 W 0,25 W 0,4 W 0,4 W 1,0 W(2) 155 C 125 C 155 C 125 C Operating voltage, Umax AC/DC Film temperature MMB 0207 0,22 W to 2,21 MW Temperature coefficient Operation mode MMA 0204 150 V 125 C 200 V 0,22 W to 221 kW 300 V 0,22 W to 332 kW 155 C 0,22 W to 1 MW 1 000 h 0,15% 0,25% 0,15% 0,25% 0,15% 0,25% 8 000 h 0,3% 0,5% 0,3% 0,5% 0,3% 0,5% 225 000 h Specified lifetime 1% - 225 000 h 1% 8 000 h - 225 000 h 8 000 h 1% - 225 000 h 8 000 h Permissible voltage against ambient : 1 minute; Uins continuous Failure rate 200 V 300 V 500 V 75 V 75 V 75 V 2 10-9/h 0,7 10-9/h 0,7 10-9/h Notes 1. The power dissipation on the resistor generates a temperature rise against the local ambient, depending on the heatflow support of the printed-circuit board (thermal resistance). The rated dissipation applies only if the permitted film temperature is not exceeded. Furthermore, a high level of ambient temperature or of power dissipation may raise the temperature of the solder joint, hence special solder alloys or board materials may be required to maintain the reliability of the assembly. 2. Specified power rating requires dedicated heat-sink pads. 2002 Nov 19 3 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Table 1 Temperature coefficient and resistance range RESISTANCE VALUE(1) DESCRIPTION T.C. TOLERANCE MMU 0102 MMA 0204 MMB 0207 100 ppm/K 5% - - 0,1 W to 0,2 W 5% 0,22 W to 0,91 W 0,22 W to 0,91 W 0,22 W to 0,91 W - 0,22 W to 0,91 W 2% 1 W to 9,1 W 50 ppm/K 1% 10 W to 2,21 MW 1 W to 10 MW 1 W to 8,2 MW 0,5% 47 W to 221 kW 10 W to 475 kW - 1% 10 W to 221 kW 10 W to 475 kW - 0,5% 47 W to 221 kW 10 W to 475 kW 10 W to 1 MW 10 mW; Imax = 2A 10 mW, Imax = 3A 25 ppm/K Jumper - 10 mW; Imax = 5A Note 1. Resistance values to be selected for 5% and 2% tolerance from E24, for 1% tolerance from E24 and E96 and for 0,5% tolerance from E24 and E192. Resistance ranges printed in bold are preferred T.C. / tolerance combinations with optimized availability. 2002 Nov 19 4 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors ORDERING INFORMATION Components may be ordered by using either a simple clear text ordering code, see "Type description and ordering code" or BCcomponents' unique 12NC. Numeric Ordering code (12NC) * The resistors have a 12-digit ordering code starting with 2312. * The subsequent 4 digits indicate the resistor type, specification and packaging; see Table 3. * The remaining 4 digits indicate the resistance value: - The first 3 digits indicate the resistance value. - The last digit indicates the resistance decade in accordance with Table 4. Table 2 12NC ordering code indicating resistor type and packaging ORDERING CODE 2312 ... ..... DESCRIPTION TYPE BLISTER TAPE ON REEL BL 3 000 units B7 7 000 units B0 10 000 units M3 3 000 units M8 8 000 units 5% - 165 3.... - 175 3.... - 060 3.... 2% - 165 2.... - 175 2.... - 060 2.... 1% - 165 1.... - 175 1.... - 060 1.... 0,5% - 165 5.... - 175 5.... - 060 5.... 1% - 166 1.... - 176 1.... - 061 1.... 0,5% - 166 5.... - 176 5.... - 061 5.... - 165 90001 - 175 90001 - 060 90001 5% - 155 3.... - 145 3.... 040 3.... - 1% - 155 1.... - 145 1.... 040 1.... - 0,5% - 155 5.... - 145 5.... 040 5.... - 1% - 156 1.... - 146 1.... 041 1.... - 0,5% - 156 5.... - 146 5.... 041 5.... - - 155 90001 - 145 90001 040 90001 - T.C. 50 ppm/K MMU 0102 25 ppm/K jumper 50 ppm/K BULK CASE B2 2 000 units TOL. - MMA 0204 25 ppm/K jumper 2002 Nov 19 - 5 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors ORDERING CODE 2312 ... ..... DESCRIPTION TYPE BLISTER TAPE ON REEL T.C. MMB 0207: 0,2 W TOL. BULK CASE B2 2 000 units BL 3 000 units B7 7 000 units B0 10 000 units M3 3 000 units M8 8 000 units 100 ppm/K 5% 195 3.... - 185 3.... - - - 50 ppm/K 5% 195 3.... - 185 3.... - - - 2% 195 2.... - 185 2.... - - - 1% 195 1.... - 185 1.... - - - 0,5% 196 5.... - 186 5.... - - - 195 90001 - 185 90001 - - - MMB 0207: >0,2 W 25 ppm/K MMB 0207 jumper - Resistance ranges printed in bold are preferred T.C. / tolerance combinations with optimized availability. Table 3 Last digit of 12NC indicating resistance decade RESISTANCE DECADE The ordering code of a MMU 0102 resistor, value 47 kW and TC 50 with 1% tolerance, supplied in blister tape of 3 000 units per reel is: 2312 165 14703. LAST DIGIT 0,1 W to 0,999 W 7 1 W to 9,99 W 8 10 W to 99,9 W 9 100 W to 999 W 1 1 kW to 9,99 kW 2 10 kW to 99,9 kW 3 100 kW to 999 kW 4 1 MW to 9,99 MW 5 10 MW to 99,9 MW 6 2002 Nov 19 ORDERING EXAMPLE 6 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Type description and ordering code * We recommend that the clear text ordering code is used to minimize the possibility of errors in order handling. M M U 0102 - 50 1% BL 47 k Film type M = metal Resistance value see Table 1 Packaging(1) B2 = 2 000 units BL = 3 000 units B7 = 7 000 units B0 = 10 000 units M3 = 3 000 units (bulk case) M8 = 8 000 units (bulk case) Product code M = MELF, cylindrical Tolerance 0,5 % 1 % 2 % 5 % Size code U = 0102 A = 0204 B = 0207 Metric DIN size 0102 0204 0207 Temperature coefficient 25 ppm/K 50 ppm/K 100 ppm/K(2) Jumpers are ordered by the resistance value 0 W, e.g. MMA 0204 BL 0R0. (1) Availability in accordance with Table 2. (2) A temperature coefficient 100 is marked -00. 2002 Nov 19 7 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors FUNCTIONAL DESCRIPTION Power Dissipation P Derating 1 MMB 0207 MMA 0204 MMU 0102 W 0,5 0 -50 0 50 70 100 C 150 Ambient Temperature amb Power Dissipation P Fig.1 Derating, standard operation. 1 MMB 0207 MMA 0204 MMU 0102 W 0,5 0 -50 0 50 70 100 C 150 Ambient Temperature amb Fig.2 Derating, power operation. 2002 Nov 19 8 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Pulse Load Pmax Single pulse 400 MMB 0207 MMA 0204 MMU 0102 100 W 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 10 s 1s Pulse Duration ti Fig.3 Maximum pulse load, single pulse; for permissible resistance change equivalent to 8 000 h operation. Continuous Pulse Load Pmax Continuous pulses 400 MMB 0207 MMA 0204 MMU 0102 100 W 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 1s 10 s Pulse Duration ti Fig.4 2002 Nov 19 Maximum pulse load, continuous pulses; for permissible resistance change equivalent to 8 000 h operation. 9 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Pulse voltage Pulse Voltage Umax 3 kV MMB 0207 MMA 0204 MMU 0102 1 kV 500 V 100 V 10 s 100 s 1 ms 10 ms 100 ms 10 s 1s Pulse Duration ti Fig.5 Maximum pulse voltage, single and continuous pulses; for permissible resistance change equivalent to 8 000 h operation. Test Voltage 1,2/50 pulse 10 kV 1 kV 100 V MMB 0207 MMA 0204 MMU 0102 10 V 10 100 1 k 10 k 100 k 1 M 10 M Resistance Value R Fig.6 Pulse load rating in accordance with IEC 60 115-1 clause 4.27; 1,2 m s / 50 m s; 5 pulses at 12 s intervals; for permissible resistance change 0,5%. 2002 Nov 19 10 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors Test Voltage 10/700 pulse 10 kV MMU 0207 0402 MMB MMA 0204 MMU MMB 0102 0207 1 kV 100 V 10 V 10 100 1 k 10 k 100 k 1 M 10 M Resistance Value R Fig.7 Pulse load rating in accordance with IEC 60 115-1 clause 4.27; 10 m s / 700 m s; 10 pulses at 1 minute intervals; for permissible resistance change 0,5%. Current Noise A1 Current noise 1 V/V 0,1 MMB 0207 MMA 0204 MMU 0102 0,01 1 k 10 k 100 k 1 M 10 M Resistance Value R Fig.8 Current Noise A1 in accordance with IEC 60 195. 2002 Nov 19 11 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors IZ/R RF-behaviour 2,0 1,5 1,0 MMB 0207 MMA 0204 MMU 0102 0,5 0,1 0,3 1 GHz Frequency f Fig.9 |Z|/R for 49,9 W MELF resistor. 2002 Nov 19 12 3 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors MECHANICAL DATA Outlines L D D1 K L1 For dimensions see Table 4. Fig.10 Outlines. Table 4 MELF resistor types, mass and relevant physical dimensions; see Fig.10 L (mm) D (mm) L1 min (mm) MMU 0102 2,2 +0/-0,1 1,1 +0/-0,1 MMA 0204 3,6 +0/-0,2 1,4 +0/-0,1 MMB 0207 5,8 +0/-0,2 2,2 +0/-0,2 TYPE 2002 Nov 19 D1 (mm) K (mm) 1,2 D +0/-0,1 0,4 0,05 7 1,8 D +0/-0,15 0,8 0,1 19 2,8 D +0/-0,2 1,2 0,2 79 13 MASS (mg) BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors TESTS AND REQUIREMENTS Unless otherwise specified the following values apply: Temperature: 15 C to 35 C All tests are carried out in accordance with the following specifications: Relative humidity: 45% to 75% EN 60 115-1, generic specification Air pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar). EN 140 400, sectional specification EN 140 401-803, detail specification The components are mounted for testing on printed-circuit boards in accordance with EN 140 400, 2.3.3, unless otherwise specified. The components are approved in accordance with the European CECC-system, where applicable. For the full test schedule refer to the documents listed above. The testing also covers most of the requirements specified by EIA/IS-703 and JIS-C-5202. The requirements stated in Table 5 are based on the required tests and permitted limits of EN 140 401-803. However, some additional tests and a number of improvements against those minimum requirements have been included. The stated requirements for long-term tests are typically fulfilled with a statistical safety of at least x +5 s. The tests are carried out in accordance with IEC 60 068 and under standard atmospheric conditions in accordance with IEC 60 068-1, 5.3. Climatic category LCT/UCT/56 (rated temperature range: Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days) is valid. Table 5 EN 60 115-1 CLAUSE Test procedures and requirements IEC 60 068-2 TEST METHOD TEST REQUIREMENTS PERMISSIBLE CHANGE (DR/R) PROCEDURE STABILITY CLASS 0,25 OR BETTER STABILITY CLASS 0,5 OR BETTER STABILITY CLASS 1 OR BETTER STABILITY CLASS 2 OR BETTER MMU 0102 10 W to 221 kW 1 W to < 10 W <1 W > 221 kW MMA 0204 10 W to 332 kW 1 W to < 10 W <1 W > 332 kW MMB 0207 10 W to 1 MW 1 W to < 10 W <1 W > 1 MW 2%; 1% 5% 1% stability for product types: 4.5 - resistance 4.8.4.2 - temperature coefficient at -20 / -55 / 20 C and 20 / 125 / 20 C 4.25.1 - endurance at 70 C: standard operation mode U = P 70 R Umax; 1,5 h on; 0,5 h off; 2002 Nov 19 - 1%; 0,5% 50 ppm/K; 25 ppm/K 70 C; 1 000 h (0,15%R + 10 mW) (0,5%R + 10 mW) 70 C; 8 000 h (0,3%R + 10 mW) (1%R + 10 mW) 14 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors EN 60 115-1 CLAUSE IEC 60 068-2 TEST METHOD TEST REQUIREMENTS PERMISSIBLE CHANGE (DR/R) PROCEDURE STABILITY CLASS 0,5 OR BETTER STABILITY CLASS 1 OR BETTER STABILITY CLASS 2 OR BETTER MMU 0102 10 W to 221 kW 1 W to < 10 W <1 W > 221 kW MMA 0204 10 W to 332 kW 1 W to < 10 W <1 W > 332 kW MMB 0207 10 W to 1 MW 1 W to < 10 W <1 W > 1 MW STABILITY CLASS 0,25 OR BETTER stability for product types: - 4.25.1 (cont.) - 4.25.3 endurance at 70 C: power operation mode U = P 70 R Umax; 1,5 h on; 0,5 h off; 70 C; 1 000 h (0,25%R + 10 mW) (0,5%R + 10 mW) 70 C; 8 000 h (0,5%R + 10 mW) (1%R + 10 mW) endurance at upper category temperature 125 C; 1 000 h (0,15%R + 5 mW) (0,25%R + 5 mW) (0,5%R + 5 mW) +(1%R + 5 mW) 155 C; 1 000 h (0,3%R + 5 mW) (0,5%R + 5 mW) (1%R + 5 mW) +(2%R + 5 mW) 4.24 3 (Ca) damp heat, steady state 40 2 C; 56 days; 93 +2/-3% RH (0,15%R + 10 mW) (0,5%R + 10 mW) (1%R + 10 mW) (1%R + 10 mW) 4.39 67 (Cy) damp heat, steady state, accelerated 85 2 C; 85 5% RH; U = 0,1 P 70 R 100 V; 1 000 h (0,25%R + 10 mW) (0,5%R + 10 mW) (1%R + 10 mW) (2%R + 10 mW) (0,15%R + 10 mW) (0,5%R + 10 mW) (1%R + 10 mW) (1%R + 10 mW) 4.23 climatic sequence: 4.23.2 2 (Ba) dry heat UCT; 16 h 4.23.3 30 (Db) damp heat, cyclic 55 C; 24 h; 90% RH; 1 cycle 4.23.4 1 (Aa) cold LCT; 2 h 4.23.5 13 (M) low air pressure 8,5 kPa; 2 h; 25 10 C 4.23.6 30 (Db) damp heat, cyclic 55 C; 24 h; 90% RH; 5 cycles LCT = -55 C; UCT = 155 C 2002 Nov 19 15 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors EN 60 115-1 CLAUSE IEC 60 068-2 TEST METHOD TEST REQUIREMENTS PERMISSIBLE CHANGE (DR/R) PROCEDURE STABILITY CLASS 0,5 OR BETTER STABILITY CLASS 1 OR BETTER STABILITY CLASS 2 OR BETTER MMU 0102 10 W to 221 kW 1 W to < 10 W <1 W > 221 kW MMA 0204 10 W to 332 kW 1 W to < 10 W <1 W > 332 kW <1 W > 1 MW STABILITY CLASS 0,25 OR BETTER stability for product types: MMB 0207 4.19 1 (Aa) cold -55 C; 2 h 14 (Na) rapid change of temperature 30 minutes at LCT; 30 minutes at UCT; LCT = -55 C; UCT = 125C 4.13 - short time overload; standard mode short time overload; power mode 4.27 - single pulse high voltage overload; standard mode 10 W to 1 MW (0,05% + 5 mW) (0,1% + 5 mW) 5 cycles (0,05%R + 10 mW) (0,1%R + 10 mW) 1000 cycles (0,15%R + 10 mW) (0,25%R + 10 mW) LCT = -55 C; UCT = 155C 1000 cycles (0,25%R + 10 mW) U = 2,5 P 70 R 2 Umax; 5 s (0,15%R + 5 mW) (0,05%R + 5 mW) (0,15%R + 5 mW) (0,5%R + 5 mW) 16 (0,5%R + 10 mW) (0,03%R + 5 mW) (0,25%R + 5 mW) severity no. 4: U = 10 P 70 R 2 Umax; 10 pulses 10 m s/700 m s single pulse high voltage overload; power mode 2002 Nov 19 1 W to < 10 W BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors EN 60 115-1 CLAUSE IEC 60 068-2 TEST METHOD TEST REQUIREMENTS PERMISSIBLE CHANGE (DR/R) PROCEDURE STABILITY CLASS 0,5 OR BETTER STABILITY CLASS 1 OR BETTER STABILITY CLASS 2 OR BETTER MMU 0102 10 W to 221 kW 1 W to < 10 W <1 W > 221 kW MMA 0204 10 W to 332 kW 1 W to < 10 W <1 W > 332 kW MMB 0207 10 W to 1 MW 1 W to < 10 W <1 W > 1 MW STABILITY CLASS 0,25 OR BETTER stability for product types: - 4.37 periodic electric overload; standard mode U = 15 P 70 R 2 Umax; 0,1 s on; 2,5 s off; 1000 cycles (0,5%R + 5 mW) (1%R + 5 mW) periodic electric overload; power mode (0,05%R + 5 mW) (0,1%R + 5 mW) 4.22 6 (Fc) vibration endurance by sweeping; 10 to 2000 Hz; no resonance; amplitude 1,5 mm or 200 m/s2; 6 h 4.17.2 58 (Td) solderability solder bath method; SnPb40; non-activated flux; 215 3 C; 3 0,3 s good tinning ( 95% covered); no visible damage solder bath method; SnAg3Cu0,5 or SnAg3,5; non-activated flux; 235 3 C; 2 0,2 s good tinning ( 95% covered); no visible damage 4.18.2 58 (Td) resistance to solder bath soldering method; 260 5 C; heat 10 1 s reflow method 2 (IR/forced gas convection); 260 5 C; 10 1 s 2002 Nov 19 (0,05%R + 10 mW) (0,1%R + 10 mW) (0,25%R + 10 mW) (0,25%R + 10 mW) (0,02%R + 10 mW) (0,05%R + 10 mW) (0,05%R + 10 mW) (0,1%R + 10 mW) 17 BCcomponents Product specification MMU 0102; MMA 0204; MMB 0207 Professional MELF resistors EN 60 115-1 CLAUSE IEC 60 068-2 TEST METHOD TEST REQUIREMENTS PERMISSIBLE CHANGE (DR/R) PROCEDURE STABILITY CLASS 0,5 OR BETTER STABILITY CLASS 1 OR BETTER STABILITY CLASS 2 OR BETTER MMU 0102 10 W to 221 kW 1 W to < 10 W <1 W > 221 kW MMA 0204 10 W to 332 kW 1 W to < 10 W <1 W > 332 kW MMB 0207 10 W to 1 MW 1 W to < 10 W <1 W > 1 MW STABILITY CLASS 0,25 OR BETTER stability for product types: 4.29 45 (XA) component solvent resistance isopropyl alcohol; 50 C; method 2 no visible damage 4.30 45 (XA) solvent isopropyl alcohol; resistance of 50 C; method 1, marking toothbrush marking legible; no visible damage 4.32 21 (Ue3) shear (adhesion) 45 N no visible damage 4.33 21 (Ue1) substrate bending depth 2 mm, 3 times Urms = Uins; 60 s 4.7 - voltage proof 4.35 - flammability IEC 60 695-2-2, needle flame test; 10 s no visible damage, no open circuit in bent position (0,05%R + 5 mW)(1) no flashover or breakdown no burning after 30 s Note 1. Special requirements apply to MICRO-MELF, MMU 0102: - R < 100 W: (0,25%R + 10 mW) - 100 W R 221 kW: 0,1%R - 221 kW < R: 0,25%R 2002 Nov 19 18