WIRE WOUND RESISTORS SILICONE COATED TYPE TM VHIA SERIES Flame Retardant Thermocoat Fully Welded Construction HIGH SURFACE TEMPERATURE Tin Plated Copper Weld(R) Power Silicone "Thermo Coat" Wire Wound Resistors Industrial / Professional Applications Alloy Resistance Wire wound To Specific Parameters On High Thermal Conductivity Ceramic Core Small Size : Power Ratio 0.5W to 10 Watts ( at 25C ) Tolerances as close as 1% R01 to 100K TCR as low as +20ppm/C available depending on application and resistance value PHYSICAL CONFIGURATION L I fd I For resistance values less than R10 and tolerance less than +2% please measure resistance over centered length LM. fD LM HTR TYPE 0.5MC 1MC 4C 3MC 3C 4MC 2.5C1 2.5C 5C1 5C 4CL 7C1 10C1 10C POWER DIMENSIONS (mm) RATING at 25C L D l d LM (Ambient) (max) (max) +1.5 +0.05 +1 0.5W 1W 4W 3W 3W 4W 2.5W 2.5W 5W 5W 4W 7W 10W 10W 7.0 2.7 10.7 3.2 16.5 6.9 12.5 5.1 15.2 6.0 13.2 5.5 13.0 5.5 13.0 5.5 23.5 8.5 23.5 8.5 23.0 7.2 32.5 9.5 45.0 10.0 45.0 10.0 38 38 38 38 38 38 38 38 38 38 38 38 38 38 0.5 0.5 1.02 0.8 0.8 0.8 1.02 0.8 1.02 0.8 0.8 1.02 1.02 0.8 30 30 40 35 40 35 35 35 45 45 45 55 65 65 RESISTANCE TYPICAL WT. RANGE min max PER PC (gms) R01 1K2 R01 3K6 R01 12K R01 7K0 R01 12K R01 6K8 R01 10K R01 10K R01 39K R01 39K R01 39K R01 68K R01 100K R01 100K 0.21 0.36 2.1 0.7 0.78 0.9 1.8 1.2 4.2 4.2 3.6 5.0 7.5 7.5 For non-inductive types and for resistance values < 1R0 + 0.8mm allowed. Note 1. The standard terminals in this (R) series is tinned Copper Weld . 2. Resistors for use under pulse conditions as per IEC Pub: 61000-4-5 are available in this series. NON INDUCTIVE RESISTOR Low inductance Aryton - Perry winding type resistors are available in this series. For noninductive types reduce maximum resistance values shown to 50% and the continuous working voltage to 70%. PRE-FORMED LEADS The resistor terminations can be bent and cut as per requirements for quick PCB mounting. Please send detailed drawings of the type of preforming required. ELECTRICAL DATA/CHARACTERISTICS Resistance tolerances available +10% [K], +5% [J], +3% [H] +2% [G], +1% [F], [Test method no. 303 of MIL 202 F] Voltage rating The resistors shall have a rated DC, continuous working voltage or an approximate sine-wave root mean square (rms) working voltage at commercial line frequency corresponding to the power rating as determined by the following formula E = PR where, E = rated DC or rms continuous working voltage. P = Power rating in watts. R = Nominal resistance in ohms. DERATING CURVE Rated Dissipation [%] 100% 83.5% Rated ambient temperature - 25C Full power dissipation at upto 25C and linearly derated down to zero dissipation at 275C. [See derating curve] 50% Resistor temperature rise as a function of applied power [see graph displayed below] 0 25 70 100 200 275 0 Ambient Temperature [ C] Short time overload Max. DR+(2%+R05). No arcing, burning or charring. [Test method - 5 secs at 5 times rated power for 3 watts and smaller; 5 secs at 10 times rated power for 4 watts and larger] rv e cu e ris 100 ra tu re Insulation resistance > 1000 M (dry) > 100 M (wet) [Test method no. 302 of MIL 202 F] 200 Te m pe Dielectric withstanding voltage Max. DR+(1%+R05). No flashover, mechanical damage, arcing or insulation breakdown. [Test method no. 301 of MIL 202 F] Temperature rise [0C] 275 C 10 20 30 40 50 60 70 80 90 100 Percentage of nominal power at an ambient temperature of 25C ENVIRONMENTAL SPECIFICATIONS Temp. co-efficient - < 1 ohm +150 ppm/ C, < 50 ohms +80 ppm/ C, above 50 ohms +60ppm/ C [Test method no. 304 of MIL 202 F]. [TCR figures given are based on the usage of normally selected cost effective resistance elements and can be significantly lowered on request]. Moisture resistance Max. DR+[3% + R05]. No mechanical damage. [Test method no. 106 E of MIL 202 F]. Load life Max. DR+[5% + R05 ohms]. No mechanical damage. [Test method no. 108 A of MIL 202 F]. MECHANICAL SPECIFICATIONS Pull test No mechanical damage. [Force supplied from 2 to 4.5 Kgs depending on size]. Solderability Continuous and satisfactory. [Test method no. 208 F of MIL 202 F]. VHIA WIRE WOUND RESISTORS SILICONE COATED TYPE TM ORDERING INFORMATION VHIA 0.5MC R01 J TOLERANCE RESISTANCE VALUE HTR TYPE SERIES Taping Types 0.5MC,1MC, 4C, 3C, 3MC, 4MC, 2.5C1, 2.5C, 5C1, 5C & 4CL are available in taped form. Please refer tape/ammo pack specifications. Tape/Reel on request. Note : In case non inductive type is required please prefix HTR TYPE with 'N' eg : N1MC. VHIA WIRE WOUND RESISTORS SILICONE COATED TYPE TM