HVC_C.qxd 23/10/03 4:18 PM Page 1 High Voltage Chip Resistors Welwyn Components HVC Series * * * * Continuous voltages up to 3kV Values up to 100M Tolerances to 0.5% Robust thick film construction Electrical Data 1206 Power rating @70C 0.3 0.5 1 volts 1000 2000 3000 Notes DC or AC peak ohms 100K to 100M Consult factory for out of range values % 0.5, 1, 2, 5, 10 See table of value ranges Resistance tolerance TCR 2512 watts Limiting element voltage Resistance range 2010 ppm/C Ambient temperature range 100 C -55 to +155 Values E24 & E96 preferred Thermal Impedance C/W 200 Any value to order 80 70 Value Ranges (ohms) Tolerance % Size 10 5 2 1 0.5 1206 100K to 100M 100K to 100M 100K to 10M 100K to 2M N/A 2010 100K to 100M 100K to 100M 100K to 10M 100K to 10M N/A 2512 100K to 100M 100K to 100M 100K to 10M 100K to 10M 100K to 10M Physical Data Dimensions (mm) & Weight (g) 1206 L W T nom A B* C Wt. 3.20.2 1.60.2 0.6 0.350.2 1.95 min 0.350.2 0.010 T 2010 2512 5.10.2 6.50.2 2.50.2 3.20.2 0.7 0.7 0.450.2 0.450.2 3.70 min 0.450.25 5.00 min 0.40.2 0.035 0.055 A B L A W Wrap-around terminations (3 faces) 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 (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 84 Issue C * 10.03 HVC_C.qxd 23/10/03 4:18 PM Page 2 High Voltage Chip Resistors Welwyn Components HVC Series Construction Solderability Resistive thick film material, overglaze and organic protection are screen printed on a 96% alumina substrate. The design and laser adjustment of the resistive element optimises the limiting element voltage of the resistor. The terminations have an electroplated nickel barrier and tin-lead solder coating, and this ensures excellent `leach' resistance properties and solderability. Marking Terminations The chips are supplied with wrap-around terminations suitable for soldering. Consult factory for alternative termination options. The body protection is resistant to all normal cleaning solvents suitable for printed circuits. The chips are not marked and the relevant information type, value, tolerance date code and quantity are recorded on the reel. Performance Data Maximum Typical Load at rated power: 1000 hours at 70C R% 0.5 0.25 Shelf life test: 12 months at room temperature R% 0.1 0.02 Short term overload: Lesser of 6.25 x rated power or 1.5 x LEV for 2S R% 0.5 0.1 Dry heat: 1000 hours at 155C R% 0.5 0.2 Long term damp heat R% 0.5 0.25 Temperature rapid change R% 0.25 0.05 Resistance to solder heat R% 0.25 Voltage proof Volts Derating from rated power at 70C Voltage coefficient of resistance Zero at 155C ppm/V 0.05 500 1206: -25 2010: -15 2512: -5 1206: -15 2010: -5 2512: -1.5 Application Notes HVC resistors are ideally suited for handling by automatic methods due to their rectangular shape and the small dimensional tolerances. Electrical connection to a ceramic substrate or to a printed circuit board can be made by reflow or wave soldering of wrap-around terminations. HVC resistors themselves can operate at a maximum temperature of 155C (see performance above). For soldered resistors, the joint temperature should not exceed 110C. This condition is met when the stated power levels at 70C are used. Wrap-around terminations provide good leach properties and ensure reliable contact. Due to the robust construction, the HVC 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 wire-leaded components applied on the other side. The PCB layout should avoid tracks running between the HVC mounting pads, as this would compromise the LEV. The LEV stated applies to operation at sea-level pressure and in a non-condensing atmosphere. Voltage derating should be applied if low pressure or high humidity may be encountered. The termination clearance dimension (B) should be used in conjunction with the creepage limit applicable to the circuit application in order to determine the derated LEV. (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 Issue C * 10.03 85 HVC_C.qxd 23/10/03 4:18 PM Page 3 High Voltage Chip Resistors Welwyn Components HVC Series Packaging HVC Resistors are supplied taped and reeled as per IEC 286-3. T2 P0 D0 T 33 1.0 Wr E Marking (Both sides) P2 W G B0 80 2 178 2 F 13 0.5 T1 0.8 0.15 2.5 0.5 A0 K0 D1 P1 Tape and reel dimensions (mm) Qty. Wr W P1 P0 P2 D0 D1 E F A0 B0 K0 T 0.5 0.3 0.1 0.1 0.05 0.1 0.2 0.1 0.05 0.1 0.1 0.1 0.05 T1 T2 Nom. 0.15 per reel 1206 9 8 4 4 2 1.5 1 1.75 3.5 1.95 3.55 1.0 0.2 0.05 1.3 3000 2010 13 12 8 4 2 1.5 1.5 1.75 5.5 2.79 5.89 0.91 0.28 0.06 1.21 3000 2512 13 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45 1800 Ordering Procedure Specify type reference etc. as shown in this example of HVC2512 at 4.7M 1: Type HVC 2512 - 4M7 F I Size Resistance value (IEC62 code) Tolerance Spare D 0.5% F 1% G 2% J 5% K 10% (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 86 Issue C * 10.03