High Voltage Chip Resistors Welwyn Components HVC Series • • • • • 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 2010 2512 Watts 0.3 0.5 1 Limiting element voltage Volts 1000 2000 3000 Overload voltage (2s) Volts 1500 3000 4000 Power rating @70°C Resistance range Ohms Resistance tolerance % TCR DC or AC peak 100K to 100M Consult factory for out of range values 0.5,1,2,5,10 See table of value ranges ppm/°C Ambient temperature range Notes 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 A B C Wt. 3.2±0.2 1.6±0.2 0.6±0.1 0.35±0.2 1.95 min 0.35±0.2 0.010 C T A 2010 2512 5.1±0.2 6.5±0.2 2.5±0.2 3.2±0.2 0.7±0.1 0.7±0.1 0.45±0.2 0.45±0.2 3.70 min 5.00 min 0.4±0.25 0.4±0.2 0.035 0.055 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 © 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 84 Issue D · 11.05 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 finish. This ensures excellent ‘leach’ resistance properties and solderability. Marking Terminations 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. The chips are supplied with wrap-around terminations suitable for soldering. Consult factory for alternative termination options. Performance Data Load at rated power: Shelf life test: ∆R% 1000 hours rated load @ 70°C Typical 1206: 2 1206: 1 2010/2512: 1 2010/2512: 0.25 0.1 ∆R% 12 months at room temperature Maximum 0.02 Derating from rated power at 70°C Short term overload: Lightning strike: Dry heat: Zero at 155°C Lesser of 6.25 x rated power or 1.5 x LEV for 2S 1.2/50µs & 10/700µs - see graph for peak voltage 1000 hours at 155°C ∆R% 2 0.2 ∆R% 0.5 0.2 ∆R% 0.5 0.1 Long term damp heat ∆R% 1 0.25 Temperature rapid change ∆R% 0.25 0.05 Resistance to solder heat ∆R% 0.25 0.05 Voltage proof Volts 500 1206: -25 Voltage coefficient of resistance ppm/V Maximum Continuous Voltage 2010: -15 2010: -5 2512: -5 2512: -1.5 Lightning Strike Performance 3500 8 Peak Voltage (kV) 3000 2500 Voltage (V) 1206: -15 2000 1500 6 4 2 1000 0 0.1 500 1 10 100 Resistance Value (MOhms) 0 0.1 1 10 100 Resistance Value (MOhms) HVC1206 HVC2010 HVC2512 Commodity Chip 1206-1.2/50 1206-10/700 2010-1.2/50 2010-10/700 2512-1.2/50 2512-10/700 Note: maximum peak voltage tested was 6kV; performance beyond this is estimated. © 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 D · 11.05 85 High Voltage Chip Resistors Welwyn Components HVC Series Application Notes temperature of 155°C (see performance above). For soldered resistors, the joint temperature should not exceed 110°C. This condition is met when the stated power levels at 70°C are used. 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. The PCB layout should avoid tracks running between the HVC mounting pads, as this would compromise the LEV. 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 260°C. 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 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. HVC resistors themselves can operate at a maximum Packaging HVC Resistors are supplied taped and reeled as per IEC 286-3. T2 P0 D0 T P2 Wr 33 ± 1.0 E Marking (Both sides) W G B0 80 ± 2 178 ± 2 F 13 ± 0.5 T1 0.8 ± 0.15 2.5 ± 0.5 A0 D1 K0 P1 Tape and reel dimensions (mm) Qty. Wr W P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2 per ±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 Nom. ±0.15 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 Example: HVC2512 at 4.7 megohms and 1% tolerance on a reel of 1800 pieces Type HVC 2512 - 4M7 F T18 Size Value (use IEC62 code) Packing Tolerance (use IEC62 code) D 0.5% J 5% T3 F 1% K 10% T18 G 2% Tape 1206 or 2010 3000/reel 2512 1800/reel © 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 86 Standard Issue D · 11.05