Surface Mounted Resistors Welwyn Components CR Series • CECC released products • Custom designs/sizes available • Any resistance value available within specified range • 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 70°C Resistance range Limiting element voltage TCR -55° to +155°C Resistance tolerance Ambient temperature range watts ohms volts ppm/°C % °C Approved CECC 40401-004 Power rating at 70°C Resistance range Limiting element voltage TCR -55°C to +125°C TCR +20°C to +70°C Resistance tolerance Ambient temperature range watts ohms volts ppm/°C ppm/°C % °C Approved CECC 40401-008 Power rating at 70°C Resistance range Limiting element voltage TCR -55°C to +155°C watts ohms volts ppm/°C Resistance tolerance Ambient temperature range Approved CECC 40401-003 Power rating at 70°C Resistance range Limiting element voltage TCR -55°C to +125°C Resistance tolerance Ambient temperature range CR0503 0.063 1R to 10M 50 CR0805 0.125 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 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 Values Thermal impedance 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 watts ohms volts ppm/°C See table of value ranges E24 & E96 preferred °C/watt 800 See table of value ranges 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 % °C Notes 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. A subsidiary of TT electronics plc © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue F · 10.05 17 Surface Mounted Resistors Welwyn Components CR Series Physical Data Dimensions of Standard Styles (mm) & Weight (g) Wrap around Style 0503 L W 1.25±0.2 0.63±.15 T max A 0.5 B† Not available 0805 2.0±0.2 1.25±0.15 0.6 1005 2.5±0.3 1.25±0.2 0.7 1206 3.2±0.2 1.6±0.2 0.7 0.4±0.2 2010 5.1±0.3 2.5±0.2 0.7 2512 6.5±0.3 3.2±0.2 0.7 C Wt 0.20±0.1 0.005 0.3±0.15 0.9 min T 0.3±0.1 0.009 0.4±0.15 0.015 1.7 min 0.4±0.15 0.020 0.6±0.3 3.0 min N/A 0.036 0.6±0.3 4.4 min N/A 0.055 Not available 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 260°C 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 Actual CECC 40401-008 CECC40401-004 CECC40401-003 Requirements Requirements Requirements Maximum Typical ≤ 3M3 2 2 0.25 0.1 0.02 Load at rated power: 1000 hours at 70°C ∆R% 2 2 Shelf life: 12 months at room temp. ∆R% - - - Zero at 155°C Zero at 125°C Zero at 125°C >3M3 3 Derating from rated power at 70°C 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 (125°C for 003 & 004 - 155°C 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 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 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 18 0.25 0.1 Issue F · 10.05 Surface Mounted Resistors Welwyn Components CR Series Application Notes Operating Temperature Range Packaging The chips themselves can operate at a maximum temperature of 155°C (see performance claims above). For soldered chips, the joint temperature should not exceed 110°C. This condition is met when the stated power levels at 70°C 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 260°C. 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 Specify type reference, value and tolerance as shown in this example of CR0805 10M 0.1%: Type CR0805 10M B Resistance value (IEC62 code) Tolerance (IEC62 code) B 0.1% C 0.25% D 0.5% F 1% G 2% J 5% © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue F · 10.05 19