Surface Mounted Resistors Welwyn Components CR Series s CECC released products s 100% high temperature and overload screened s s s s s s versions available for high reliability applications Terminations available for wire bonding or soldering Available in sizes down to 0503 Resistance range 1 ohm to100M ohms Tolerances down to 0.1% Solder terminations have a nickel barrier layer Shorting Links available Electrical Data Commercial Power rating at 70C Resistance range Limiting element voltage TCR -55 to +155C Resistance tolerance Ambient temperature range watts ohms volts ppm/C CR0503 0.063 1R to 10M 50 % C CECC 40401-004 Requirements Power rating at 70C watts Resistance range ohms Limiting element voltage volts TCR -55C to +125C ppm/C TCR +20C to +70C ppm/C Resistance tolerance % Ambient temperature range C CR0805 CR1206 CR2010 0.125 0.25 0.5 1R to 10M 1R to 10M 1R to 1M 100 200 400 <10 ohms 200: 10 to 1M ohms 100: >1M ohms 250 0.1, 0.25, 0.5, 1, 2, 5 -55 to 155 % C See table of value ranges See table of value ranges CR2512 1.0 1R to 1M 500 See table of value ranges CR0805 CR1206 0.063 0.125 1R to 3M 1R to 5M 100 200 <5 ohms 500: 5 to 10 ohms 350: 10 to 3M ohms 100: >3M ohms 250 0.25, 0.5, 1, 2, 5 -55 to 125 % C Notes CR1206 0.25 1R to 10M 100 200 <10 ohms 200: 10 to 1M 100: >1M 200 <10 ohms 200: 10 to 1M 50: >1M 100 0.5, 1, 2, 5 -55 to +125 CECC 40401-003 Requirements Power rating at 70C watts Resistance range ohms Limiting element voltage volts TCR -55C to +125C ppm/C Resistance tolerance Ambient temperature range CR1005 CR1206 CR2010 CR2512 0.125 0.25 0.5 1.0 1R to 100M 1R to 1M 100 150 200 400 500 <10 ohms 350: 10 to 100 ohms 200: 100 to 1M ohm 100: >1M ohm 250 0.1, 0.25, 0.5, 1, 2, 5 -55 to 155 CR0805 0.125 CECC 40401-008 Requirements Power rating at 70C watts Resistance range ohms Limiting element voltage volts TCR -55C to +155C ppm/C Resistance tolerance Ambient temperature range CR0805 0.125 See table of value ranges These tables indicate the CECC specification requirements, and these are met or exceeded by the corresponding CR series products Values Thermal impedance E24 & E96 preferred C/watt 800 360 290 200 Any value to order 80 70 Mounted on custom designed PCB's General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com A subsidiary of TT electronics plc 09 0711. . 07 17 Surface Mounted Resistors Welwyn Components CR Series Physical Data Dimensions of Standard Styles (mm) & Weight (g) Wrap around Style L W T max A C Wt 0.200.1 0.005 0.30.1 0.009 0.40.15 0.015 1.7 min 0.40.15 0.020 0.60.3 3.0 min N/A 0.036 0.60.3 4.4 min N/A 0.055 0503 1.250.2 0.63.15 0.5 0805 2.00.2 1.250.15 0.6 1005 2.50.3 1.250.2 0.7 1206 3.20.2 1.60.2 0.7 0.40.2 2010 5.10.3 2.50.2 0.7 2512 6.50.3 3.20.2 0.7 B Not available 0.30.15 0.9 min Not available T C A B L A C W T Wrap-around terminations (3 faces) L W Planar terminations Alternative styles for surface mounting resistors This dimension determines the number of conductors which may pass under the surface mounted device. Construction Solderability Thick film resistor material, overglaze and organic protection are screen printed on a 96% alumina substrate. Terminations Wrap-around terminations have an electroplated nickel barrier and solder coating, this ensures excellent `leach' resistance properties and solderability. They will withstand immersion in solder at 260C for 30 seconds. Planar (or single-sided) termination is gold and suitable for wire-bonding; wrap-around is suitable for soldering. Marking All relevant information recorded on the primary package or reel. Performance Data CECC 40401-008 CECC40401-004 CECC40401-003 Actual Requirements Requirements Requirements Maximum Typical 3M3 2 2 0.25 0.1 0.02 Load at rated power: 1000 hours at 70C R% 2 2 Shelf life: 12 months at room temp. R% - - - Zero at 155C Zero at 125C Zero at 125C >3M3 3 Derating from rated power at 70C Overload R% 0805:1 1206:0.5 Dry Heat: 1000 hours at UCT R% Long term damp heat 0.5 2 1 0.1 2 1 3M3 2 to 10M 1 0.2 >3M3 3 >10M 2 >10M 1 R% 2 2 2 1 0.25 Temperature rapid change R% 0.5 0.5 1 0.25 0.05 Resistance to solder heat R% 0.5 2 0.25 Voltage proof volts (125C for 003 & 004 - 155C for 008) 0.5 0.05 0805 : 200 1206 : 300 0503 : 100 2010 : 400 2512 : 500 All others : 500 Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms Value Ranges (ohms) Tolerance % Size 5 2 1 0.5 0.25 0.1 0503 1 to 10M 1 to 10M 10 to 10M 100 to 1M N/A N/A 0805 1 to 100M 1 to 50M 1 to 20M 10 to 10M 100 to 1M 100 to 1M 1005 1 to 100M 1 to 50M 1 to 20M 10 to 10M 100 to 1M 100 to 1M 1206 1 to 100M 1 to 50M 1 to 25M 10 to 10M 100 to 1M 100 to 1M 2010 1 to 1M 1 to 1M 1 to 1M 10 to 10M 100 to 1M N/A 2512 1 to 1M 1 to 1M 1 to 1M 10 to 10M 100 to 1M N/A (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Surface Mounted Resistors Welwyn Components CR Series Application Notes Operating Temperature Range Packaging The chips themselves can operate at a maximum temperature of 155C (see performance claims above). For soldered chips, the joint temperature should not exceed 110C. This condition is met when the stated power levels at 70C are used. Wrap-around Termination Chip resistors are supplied taped and reeled on standard 8mm tape to IEC 286-3. Mounting Planar Terminations This chip resistor is ideally suited for handling by automatic methods due to its rectangular shape and the small dimensional tolerances. Electrical connection to a ceramic substrate or to a printed circuit board can be made by wire bonding (eg suffix `G' in CR0805G) or by reflow soldering of wrap-around terminations (eg suffix `F' in CR0805F). Resistor chips are supplied in waffle packs. Quantity per reel; 3000 max. The `F' terminations provide good leach properties and ensure reliable contact. Due to the robust construction the resistor chip can be immersed in the solder bath for 30 seconds at 260C. This enables the resistor to be mounted on one side of a printed circuit board and other wire-leaded components on the other side. Ordering Procedure Example: CR2512 with solderable wraparound terminations at 10 kilohms and 1% tolerance on a reel of up to 1800 pieces CR2512F- 10KFI Type Termination F G Solderable wraparound Gold pad planar 0805, 1206, 2010, 2512 only All sizes Value (use IEC62 code) Tolerance (use IEC62 code) B 0.1% C 0.25% Packing I Tape Waffle D 0.5% F 1% G 2% J 5% 0805F, 1206F, 2010F 2512F G Termination Up to 3000/reel Up to 1800/reel Standard For CECC released product state on order the CECC number. Example: CR2512F-10KFI CECC40401-008 For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: CR2512F-10KFPB For zero-ohm jumper chips use the dummy value & tolerance code R005J (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 11 . 09 19