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| High Voltage Chip Resistors HVC Series Welwyn Components * * * * * Continuous voltages up to 3kV Overload voltages up to 4kV Values up to 100M Tolerances to 0.5% Robust thick film construction Electrical Data 1206 Power rating @70C Limiting element voltage Overload voltage (2s) Resistance range Resistance tolerance TCR Ambient temperature range Values Thermal Impedance C/W 200 Watts Volts Volts Ohms % ppm/C C 0.3 1000 1500 2010 0.5 2000 3000 100K to 100M 0.5,1,2,5,10 100 -55 to +155 E24 & E96 preferred 80 70 Any value to order 2512 1 3000 4000 DC or AC peak Consult factory for out of range values See table of value ranges Notes Value Ranges (Ohms) Tolerance % Size 1206 2010 2512 10 100K to 100M 100K to 100M 100K to 100M 5 100K to 100M 100K to 100M 100K to 100M 2 100K to 10M 100K to 10M 100K to 10M 1 100K to 2M 100K to 10M 100K to 10M 0.5 N/A N/A 100K to 10M Physical Data Dimensions (mm) & Weight (g) L 1206 2010 2512 3.20.2 5.10.2 6.50.2 W 1.60.2 2.50.2 3.20.2 T 0.60.1 0.70.1 0.70.1 A 0.350.2 0.450.2 0.450.2 B 1.95 min 3.70 min 5.00 min C 0.350.2 0.40.25 0.40.2 Wt. 0.010 A C T B L 0.035 0.055 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 Issue D * 11.05 (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 High Voltage Chip Resistors HVC Series Construction 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. Welwyn Components Solderability The terminations have an electroplated nickel barrier and tin finish. 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 on type, value, tolerance date code and quantity are recorded on the reel. Performance Data Maximum Load at rated power: Shelf life test: 1000 hours rated load @ 70C Typical 1206: 1 2010/2512: 0.25 0.02 Zero at 155C 0.2 0.2 0.1 0.25 0.05 0.05 1206: -15 2010: -5 2512: -1.5 R% R% R% R% R% R% R% R% Volts ppm/V 1206: 2 2010/2512: 1 0.1 2 0.5 0.5 1 0.25 0.25 500 1206: -25 2010: -15 2512: -5 12 months at room temperature Derating from rated power at 70C Short term overload: Lightning strike: Dry heat: Lesser of 6.25 x rated power or 1.5 x LEV for 2S 1.2/50s & 10/700s - see graph for peak voltage 1000 hours at 155C Long term damp heat Temperature rapid change Resistance to solder heat Voltage proof Voltage coefficient of resistance Maximum Continuous Voltage 3500 8 Lightning Strike Performance Peak Voltage (kV) 3000 2500 6 Voltage (V) 2000 1500 1000 4 2 0 500 0 0.1 1 10 100 1206-1.2/50 2010-10/700 1206-10/700 2512-1.2/50 2010-1.2/50 2512-10/700 0.1 1 10 100 Resistance Value (MOhms) Resistance Value (MOhms) HVC1206 HVC2512 HVC2010 Commodity Chip Note: maximum peak voltage tested was 6kV; performance beyond this is estimated. (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 D * 11.05 85 High Voltage Chip Resistors HVC Series Welwyn Components 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. 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. 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. 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, in a non-condensing atmosphere and non-contaminating environment. Voltage derating should be applied if low pressure, high humidity or contamination 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. Packaging HVC Resistors are supplied taped and reeled as per IEC 286-3. T2 D0 P2 P0 T Marking (Both sides) 33 1.0 Wr E 13 0.5 F 178 2 80 2 B0 2.5 0.5 0.8 0.15 T1 K0 A0 P1 D1 Tape and reel dimensions (mm) Wr 0.5 1206 2010 2512 9 13 13 W 0.3 8 12 12 P1 0.1 4 8 8 P0 0.1 4 4 4 P2 0.05 2 2 2 D0 0.1 1.5 1.5 1.5 D1 0.2 1 1.5 1.5 E 0.1 1.75 1.75 1.75 F 0.05 3.5 5.5 5.5 A0 0.1 1.95 2.79 3.61 B0 0.1 3.55 5.89 6.96 K0 0.1 1.0 0.91 1.17 T 0.05 0.2 0.28 0.28 T1 Nom. 0.05 0.06 0.06 T2 0.15 1.3 1.21 1.45 G W Qty. per reel 3000 3000 1800 Ordering Procedure Example: HVC2512 at 4.7 megohms and 1% tolerance on a reel of 1800 pieces Type Size Value (use IEC62 code) Tolerance (use IEC62 code) D F G 0.5% 1% 2% J K 5% 10% T3 T18 Tape 1206 or 2010 2512 3000/reel 1800/reel HVC 2512 - 4M7 F T18 Packing Standard (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 D * 11.05 |
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