Ultra Precision Metal Film Resistors Welwyn Components CAR series • Tolerance down to 0.01% • Low TCR’s • High reliability • Superior moisture performance • Non standard values available • Highest stability metal film available • Matched sets and networks Electrical Data CAR5 CAR6 CAR7 Power rating at 70°C watts 0.25 0.33 0.5 Power rating at 85°C watts 0.125 0.25 0.33 Resistance range ohms 10R0 to 3M 10R0 to 5M 10R0 to 10M volts 250 350 500 Limiting element voltage TCR (20 to +70°C) ppm/°C Resistance tolerance % 5(V), 10(T), 15(Y), 25(D), 50(C) See tolerance/TCR 0.01(L), 0.02(P), 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) combinations E24, E96 preferred below Standard values Thermal impedance °C/watt Ambient temperature range Notes 110 70 °C 60 -55 to +155 Table of Resistance Restrictions Tolerance TCR CAR5 ppm/°C 0.01-0.02% CAR6 CAR7 0.05% 0.1-1% 0.01/0.02% 0.05% 0.1-1% 0.01-0.02% 0.05% 0.1-1% 5 50 to 300k 10 to 500k 10 to 500k 50 to 500k 10 to 500k 10 to 500k 50 to 750k 10 to 750k 10 to 750k 10 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 1.5M 15 50 to 300k 10 to 1M 10 to 1M 50 to 500k 10 to 1M 10 to 1M 50 to 750k 10 to 1M 10 to 3.5M 25 50 to 300k 10 to 1M 10 to 1.5M 50 to 500k 10 to 1M 10 to 3M 50 to 750k 10 to 1M 10 to 5M 50 50 to 300k 10 to 1M 10 to 3M 50 to 500k 10 to 1M 10 to 5M 50 to 750k 10 to 1M 10 to 10M Physical Data Dimensions (mm) and Weight (g) Type PCB Min mounting Bend Wt. L Max D Max f min d nom. centres Radius nom. CAR5 7.2 2.5 30 0.6 10.2 0.6 0.24 CAR6 10.0 3.7 30 0.6 12.7 0.6 0.40 CAR7 15.5 5.5 30 0.8 18.4 1.2 1.15 d D L f 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 178 Issue B · 03.02 Ultra Precision Metal Film Resistors Welwyn Components CAR series Construction Marking Ceramic rods are coated with a metal film and plated steel caps are force fitted. A helical cut is used to adjust the film to its final value. Termination wires are welded to the caps and the resistor is protected with a specially formulated epoxy coating. Type reference, TCR code, resistance value and tolerance code. The resistance value marking conforms to IEC 62. The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Terminations Material Strength Solderability Solvent Resistance Solder-coated copper wire. The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 Performance Data Values 10 ≤ 250k Values > 250k Actual Performance Actual Performance Maximum Typical Maximum Typical 0.05 Load at rated power : 1000 hrs at 70°C (or 85°C) ∆R % 0.05 0.02 0.25 Dry heat : 1000 hrs at 155°C ∆R % 0.15 0.08 1 0.2 Shelf life : 12 months at room temperature ∆R % 0.01 0.003 0.04 0.02 Short term overload ∆R % 0.01 0.001 0.08 0.01 Climatic ∆R % 0.05 0.02 0.2 0.05 Long term damp heat ∆R % 0.05 0.02 0.2 Temperature rapid change ∆R % 0.04 0.02 0.25 0.05 Resistance to solder heat ∆R % 0.02 0.003 0.05 0.005 Vibration and bump ∆R % 0.02 0.002 0.06 0.02 Derating from rated power at 70°C (or 85°C) Zero at 155°C Climatic category Zero at 155°C 55/155/56 55/155/56 0.05 Noise (in a decade of frequency) µV/V 0.2 0.03 1 0.1 Voltage coefficient of resistance ppm/V 0.3 <0.05 0.2 <0.05 Application Notes Figure 1 Resistors can be supplied matched for tolerance and TCR down to ±0.005% and ±1ppm/°C, respectively, either as separate resistors or pre-assembled and encapsulated within a plastic box. 5 f1 The individual resistors within a set or module can be manufactured with a tolerance of ±0.01% and a TCR of ±5ppm/°C. Standard Quantities Per Pack Type CAR5 CAR6 6 f2 52 6 Body location f1 – f2 ≤ 1.4 mm Packaging CAR7 Small box 250 125 25 Large box 1000 500 250 Reel 5000 2500 - Ammo Pack 1000 1000 - CAR5 and CAR6 resistors are supplied taped (on reel or in ammo pack) or loose packed. CAR7 resistors are supplied loose packed. © 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 B · 03.02 179