Pulse Withstanding Chip Resistors PWC SERIES * Excellent Pulse Withstand Performance * Improved working voltage * Improved power rating * Standard chip sizes (0805 to 2512) Electrical Data Size Power @70C Resistance range Tolerance LEV TCR Operating temperature Values Pulse Capability 0805 0.125W 1206 0.33W 2010 0.75W 2512 1.5W 1R0 to 10M 0.5*, 1, 5% 150V 200V 400V 500V <10R:200ppm/C >10R:100ppm/C -55 to +155C E96 preferred other values to special order See graphs - full application note available on request *0.5% Tolerance only available on values 10R to 1M0 Physical Data Dimensions of PWC resistors are given below in mm and weight in g 0805 L 2.00.3 W 1.250.2 T max 0.6 A 0.30.15 B* 0.9 min C 0.30.1 Wt. 0.009 1206 3.20.4 1.60.2 0.7 0.40.2 1.7 min 0.40.15 0.020 2010 5.10.3 2.50.2 0.8 0.60.3 3.0 min N/A 0.036 2512 6.50.3 3.20.2 0.8 0.60.3 4.4 min N/A 0.055 Construction Marking Thick film resistor material, overglaze and organic protections are screen printed on a 96% alumina substrate. Wrap-around terminations have an electroplated nickel barrier and tin-lead solder coating; this ensures excellent `leach' resistance properties and solderability. Chips can withstand immersion in solder at 260C for 30 seconds. No marking provided. B Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note IRC, reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own test data and is considered accurate at time of print. IRC - Advanced Film Division 4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com Issue A 15-8-2001 SM Performance Data Maximum 1 0.1 R% R% Load at rated power: 1000 hours at 70C Shelf life test: 12 months at room temperature Derating from rated power at 70C Overload: 6.25 x rated power for 5 seconds Dry heat: 1000 hours at 155C Long term damp heat Temperature rapid change Resistance to solder heat Voltage proof Typical 0.25 0.02 Zero at 155C R% R% R% R% R% Volts 1 1 1 0.25 0.25 0.1 0.2 0.25 0.05 0.05 500 Note: An 0.01 ohm addition to be added to the performance of all resistors <10 ohms. Pulse Performance Data 1.2/50 s Lightning Surge 10000 Peak voltage (volts) 1000 O805 1206 2010 2512 100 Lightning Surge Resistors are tested in accordance with IEC 60 115-1 using both 1.2/50us and 10/700us pulse shapes. The limit of acceptance is a shift in resistance of less than 1% from the initial value. 10 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) 10/700 s Lightning Surge 10000 Peak Voltage (Volts) 1000 O805 1206 2010 2512 100 10 1 10 100 1000 10000 100000 1000000 10000000 Value (ohms) General Note IRC, reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own test data and is considered accurate at time of print. IRC - Advanced Film Division 4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com Issue A 15-8-2001 SM Pulse Performance Data S in g l e P u l s e 1000 Pulse Power P (W) 100 O805 1206 2010 2512 10 Continuous Load Due to Repetitive Pulses. The continuous load graph was obtained by applying repetitive rectangular pulses where the pulse period was adjusted so that the average power dissipated in the resistor was equal to its rated power at 70C. Again the limit of acceptance was a shift in resistance of less than 1% from the initial value. 1 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Continuous Pulses 100 10 Pulse Power P (W) Single Impulse. The single impulse graph is the result of 50 impulses of rectangular shape applied at one minute intervals. The limit of acceptance was a shift in resistance of less than 1% from the initial value. The power applied was subject to the restrictions of the maximum permissible impulse voltage graph as shown. O805 1206 2010 2512 1 0.1 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) Pulse Voltage 10000 Pulse Voltage (Volts) 1000 O 8 0 5 1206 2010 2512 100 10 0.0001 0.001 0.01 0.1 1 Pulse Duration ti (s) General Note IRC, reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own test data and is considered accurate at time of print. IRC - Advanced Film Division 4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com Issue A 15-8-2001 SM Packaging Resistors are supplied tape and reel as per IEC 286-3. Type Reel 1206 3,000 2010 3,000 2512 1,800 Mounting PWC 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 soldering of wrap-around terminations. Wrap-around terminations provide good leach properties and ensure reliable contact. Due to the robust construction the PWC 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. Operating Temperature Range PWC 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. Ordering Procedure Specify type reference etc as shown in this example of PWC2512 10K ohms 1%. PWC 2512 - 10K F Type Size Value (use IEC62 code) Tolerance (use IEC 62 code) D F J 0.5% 1% 5% General Note IRC, reserves the right to make changes in product specification without notice or liability. All information is subject to IRC's own test data and is considered accurate at time of print. IRC IRC - Advanced Film Division 4222 South Staples Street, Corpus Christi, Texas, 78411,USA. Tel: 361-992-7900 Fax: 361-992-3377 Web: www.irctt.com Issue A 15-8-2001 SM