Thick Film Chip Resistors Description: The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to within tolerance by laser cutting of this resistive layer. The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For ease of soldering the outer layer of these end terminations is a Tin (lead free) alloy. Features: * * * * High reliability and stability Reduced size of final equipment Lower assembly costs Higher component and equipment reliability Application: Quick Reference Data * * * Consumer electrical equipment EDP, Computer application Telecom application Item General Specification Series No. MCWR12 MCWR08 MCWR06 MCWR04 Size code 1206(3216) 0805(2012) 0603(1608) 0402(1005) Resistance Range 1 to10M 1% tolerance Resistance Tolerance 1% E96/E24 TCR (ppm/C) 10M R >10 R10 100 -200 to +400 Max. dissipation @ Tamb=70C 1/4 W 1/8 W 1/10 W 1/16 W Max. Operation Voltage (DC or RMS) 200V 150V 50V 50V Max. Overload Voltage (DC or RMS) 400V 300V 100V 100V Climatic category 55/155/56 Note : 1. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by RCWV = Rated Power x Resistance Value or Max. RCWV listed above, whichever is lower. 2. The resistance of Jumper is defined <0.05. www.element14.com www.farnell.com www.newark.com Page <1> 15/09/14 V1.0 Thick Film Chip Resistors MCWR12 MCWR08 MCWR06 MCWR04 L 3.1 0.1 2 0.1 1.6 0.1 1 0.05 W 1.6 0.1 1.25 0.1 0.8 0.1 0.50 0.05 T 0.6 0.15 0.5 0.15 0.45 0.15 0.35 0.05 Tb 0.45 0.2 0.4 0.2 0.3 0.15 0.25 0.1 Tt 0.5 0.2 0.4 0.2 0.3 0.1 0.2 0.1 Dimensions : Millimetres Functional Description: Product characterization Standard values of nominal resistance is E96 series for resistors with a tolerance of 1%. Derating The power that the resistor can dissipate depends on the operating temperature; see Fig.2 Figure 2Maximum dissipation in percentage of rated power as a function of the ambient temperature for MCWR12, MCWR08, MCWR06, MCWR04 Mounting Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by automatic placement systems. Chip placement can be on ceramic substrates and printed-circuit boards (PCBs). Electrical connection to the circuit is by individual soldering condition. The end terminations guarantee a reliable contact. www.element14.com www.farnell.com www.newark.com Page <2> 15/09/14 V1.0 Thick Film Chip Resistors Soldering Condition: The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260C for 10 seconds. Therefore, it is possible to mount Surface Mount Resistors on one side of a PCB and other discrete components on the reverse (mixed PCBs). Surface Mount Resistors are tested for solderability at 235C during 2 seconds. The test condition for no leaching is 260C for 30 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig 3. 260 245 max. ramp up rate = 3C/s max. ramp down rate = 6C/s Temp. (DegC) 217 200 150 For SnAgCu series solder pase 25 30 sec min 60-120 Sec Time 60-150 Sec 480 Sec max to Peak Fig 3. Infrared soldering profile for Chip Resistors Catalogue Numbers: The resistors have a catalogue number starting with MCWR12 X 472_ J Resistance code T Size code Type code Tolerance Packaging code MCWR12 : 1206 X: 4.7 =4R7_ F : 1% T : 7" Reeled taping MCWR08 : 0805 1%, 10 to 1M 10 =100_ P : Jumper Q : 10" Reeled taping MCWR06 : 0603 W: 220 =221_ G : 13" Reeled taping MCWR04: 0402 1%, < 10; >1M Jumper =000_ ("_" means a blank) H : 13" reel 50Kpcs only for 0402 1%, E24+E96: 3 significant digits followed by no. of zeros D : 7" reel 20Kpcs only for 0402 102 =1020 37.4K =3742 L Termination code L = Sn base (lead free) B : Bulk A : 7" reel 15Kpcs only for 0402 MCWR12, MCWR08, MCWR06: 1. Reeled tape packaging : 8mm width paper taping 5,000pcs per 7" reel, 10kpcs per 10" reel, 20kpcs per 13" reel. 2. Bulk packaging : 5,000pcs per poly-bag MCWR04: 1. Reeled tape packaging : 8mm width paper taping 10,000pcs per 7" reel, 20,000pcs per 10" reel. 70,000pcs per 13" reel. 2. Bulk packaging : 10,000pcs per poly-bag www.element14.com www.farnell.com www.newark.com Page <3> 15/09/14 V1.0 Thick Film Chip Resistors Test and Requirements: Essentially all tests are carried out according to the schedule of IEC publication 115-8, category LCT/UCT/56 (rated temperature range : Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days). The testing also meets the requirements specified by EIA, EIAJ and JIS. The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical robustness testing procedure for electronic components" and under standard atmospheric conditions according to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied : Temperature: 15C to 35C. Relative humidity: 45% to 75%. Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar). All soldering tests are performed with midly activated flux. Test Electrical Characteristics JISC5201-1: 1998 Clause 4.8 Procedure / Test Method Requirement Resistor 0 - DC resistance values measurement - Temperature Coefficient of Resistance (T.C.R) Within the specified tolerance Refer to t1 : 20C+5C/-1 C; t2 : -55C or +155C "QUICK REFERENCE <50m DATA" R1 : Resistance at reference temperature (20C +5C / -1 C) R2 : Resistance at test temperature (-55C or +155C) Natural resistance change per change in degree centigrade. Resistance to soldering heat(R.S.H) Un-mounted chips completely immersed for 10 1second in a JISC5201-1:1998 SAC solder bath at 260C 5C Clause 4.18 1%: R/Rmax. (0.5%+0.05 ) no visible damage Solderability JISC5201-1: 1998 Clause 4.17 Un-mounted chips completely immersed for 10 1second in a SAC solder bath at 235C 5C 95% coverage min., good tinning and no visible damage Temperature cycling JISC5201-1: 1998 Clause 4.19 30 minutes at -55C 3C, 2-3 minutes at 20C +5C -1C, 30 minutes at +155C 3C, 2-3 minutes at 20C +5C -1C, total 5 continuous cycles 1%: R/Rmax. (0.5%+0.05) No visible damage <50m High Temperature Exposure MIL-STD-202 method 108 1,000 +48/-0 hours; without load in a temperature chamber controlled 155 3 C 1%:R/ Rmax.(1%+0.1) No visible damage <50m Bending strength JISC5201-1: 1998 Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4), bending once 3mm for 10sec, 5mm for MCWR04 1%:R/ Rmax.(1%+0.05) No visual damaged <50m Adhesion JISC5201-1: 1998 Clause 4.32 Pressurizing force: 5N, Test time: 10 1sec. No remarkable damage or removal of the terminations Short Time Overload (STOL) JISC5201-1: 1998 Clause 4.13 2.5 times RCWV or max. overload voltage, for 5seconds 1%: R/R max. (1%+0.05) No visible damage <50m <50m www.element14.com www.farnell.com www.newark.com Page <4> 15/09/14 V1.0 Thick Film Chip Resistors Requirement Test Procedure / Test Method Load life in Humidity JISC5201-1: 1998 Clause 4.24 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller at 40C 2C and 90 to 95% relative humidity, 1.5hours on and 0.5 hours off 1%: R/R max. (1%+0.1) No visible damage <50m Load life (endurance) JISC5201-1: 1998 Clause 4.25 1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller 702C, 1.5 hours on and 0.5 hours off 1%: R/R max. (1%+0.1) No visible damage <50m Resistor 0 Insulation Resistance JISC5201-1: 1998 Apply the maximum overload voltage (DC) for 1minute Clause 4.6 R 10G Dielectric Withstand Voltage JISC5201-1: 1998 Clause 4.7 No breakdown or flashover Apply the maximum overload voltage (AC) for 1 minute Test Condition For Jumper (0 ) Item MCWR12 MCWR08 MCWR06 MCWR04 Power Rating At 70C 1/4W 1/8W 1/10W 1/16W Resistance MAX. 50m Rated Current 2A 1.5A 1A 1A Peak Current 5A 3.5A 3A 2A Operating Temperature -55C to +155 C Packaging: Paper Tape specifications Dimensions : Millimetres www.element14.com www.farnell.com www.newark.com Page <5> 15/09/14 V1.0 Thick Film Chip Resistors Series No. A B MCWR12 3.6 0.2 2 0.2 MCWR08 2.4 0.2 1.65 0.2 MCWR06 1.9 0.2 1.1 0.2 MCWR04 1.2 0.1 0.7 0.1 Series No. P1 P0 MCWR12/WR08 MCWR06 MCWR04 4 0.1 W F E 8 0.3 3.5 0.2 1.75 0.1 D T Max. 1 4 0.1 1.5 +0.1 -0.0 2 0.1 0.65 0.05 0.4 0.05 7" Reel dimensions: Symbol A B C D 7" reel 178 2 60 1 13 0.2 9 0.5 10" reel 254 2 100 1 13 0.2 9 0.5 13" reel 330 2 100 1 13 0.2 9 0.5 Important Notice : This data sheet and its contents (the "Information") belong to the members of the Premier Farnell group of companies (the "Group") or are licensed to it. No licence is granted for the use of it other than for information purposes in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change without notice and replaces all data sheets previously supplied. The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness, any error in or omission from it or for any use made of it. Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any assumptions based on information included or omitted. Liability for loss or damage resulting from any reliance on the Information or use of it (including liability resulting from negligence or where the Group was aware of the possibility of such loss or damage arising) is excluded. This will not operate to limit or restrict the Group's liability for death or personal injury resulting from its negligence. Multicomp is the registered trademark of the Group. (c) Premier Farnell plc 2012. www.element14.com www.farnell.com www.newark.com Page <6> 15/09/14 V1.0