MCWF08U6040BTL

High Precision Thin Film Chip Resistor Description: The resistors are constructed in a high grade ceramic body (aluminium 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 environmental soldering issue, the outer layer of these end terminations is a Lead-free solder. Features: Application: •  •  •  •  •  •  •  •  SMD metal film resistor with high reliability and stability High performance of TCR: 25 ppm/K Low current noise ±0.05% is upon the customer request Medical equipment Measuring instrument Communication device Computer and Printer Laser trimmed Protective Layer Resistive Element Marking Primary Layer Termination Alumina Substrate Construction of Chip-R Quick Reference Data Item Series No. Size code Resistance Tolerance Resistance Range TCR (ppm/°C) Max. Dissipation @ T amb = 70°C Max. Operation Voltage (DC or RMS) Max. Overload Voltage (DC or RMS) Operation temperature General Specification MCWF08U 0805 (2012) ±1%, ±0.5%, ±0.25%, ±0.1%, ±0.05% 4.7Ω to 1MΩ (E24 +E192) +25 to -25 ppm/°C 1/10 W 100V 200V -55°C to +155°C Note: 1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” 2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by RCWV =  Rated Power × Resistance Value or Max. RCWV listed above, whichever is lower. www.element14.com www.farnell.com www.newark.com Page 20/12/16 V1.0 High Precision Thin Film Chip Resistor Mechanical Data Part Number MCWF08U L 2 ±0.1 W 1.25 ±0.1 A 0.25 ±0.2 B 0.4 ±0.2 t 0.5 ±0.15 Dimensions : Millimetres Marking 4-digits marking for 0805 size For E24/E96 series, each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value. For non E24/E96 series, no marking is applied! Example: Resistance 10Ω 12Ω 100Ω 6800Ω 47000Ω 4-digits marking 10R0 12R0 1000 6801 4702 Functional Description: Product characterization Standard values of nominal resistance are taken from the E192 & E24 series for resistors with a tolerance of ±1%, ±0.5%, ±0.25%, ±0.1%, ±0.05%. The values of the E24/E192 series are in accordance with “IEC publication 60063”. Derating The power that the resistor can dissipate depends on the operating temperature. Max. Dissipation in percentage of rated power As a function of the ambient temperature 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 20/12/16 V1.0 High Precision Thin Film Chip Resistor Soldering Condition: The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260°C 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 235°C during 2 seconds. The test condition for no leaching is 260°C for 30 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in below figure. Infrared soldering profile for Chip Resistors Catalogue Numbers: The resistors have a catalogue number starting with MCWF08 U XXXX B T Size code Type code Resistance code Tolerance Packaging code MCWF08 : 0805 U : TCR 25ppm E192+E24: 3 significant digits followed by No. of zeros B : ±0.1% T : Reeled e.g.: L Termination code L = Sn base (lead free) 102Ω = 1020 37.4kΩ = 3742 220Ω = 2200 Reeled tape packaging : 8mm width paper taping 5,000pcs/reel for MCWF08U Series. www.element14.com www.farnell.com www.newark.com Page 20/12/16 V1.0 High Precision Thin Film Chip Resistor Test And Requirements Basic specification : JIS C 5201-1 : 1998 Test Clause 4.5 DC resistance Clause 4.8 Temperature Coefficient of Resistance (TCR ) Procedure DC resistance values measured at the test voltages specified below :