
WIRE WOUND RESISTORS
SILICONE COATED TYPE
HIA
PRE-FORMED LEADS - The resistor terminations can be bent and cut as per requirements for quick PCB
mounting. Please send detailed drawings of specific type of preforming required. Depending on application
®
the resistor leads may be tin plated Copper Weld instead of tin plated copper .
TAPING - Types H-0.5, D-0.5, H-1, H-2, H-3, H-3A, H-4, H-5A & H-5 can be supplied in taped form. Please refer
to on request. tape/ammo pack specifications. T ape/Reel
TM
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.
Rated ambient temperature - 40°C
Full power dissipation at upto 40°C and linearly
derated down to zero dissipation at 275°C. [See
derating curve]
Resistor temperature rise as a function of applied
power
[see graph displayed below]
Resistance tolerances available
+10% [K], +5% [J], +3% [H] +2% [G], +1% [F], +0.5%
[D], +0.25% [C] [T est method no. 303 of MIL 202 F]
ELECTRICAL DATA/CHARACTERISTICS
DERATING CURVE
100%
83.5%
50%
0
Rated Dissipation [%]
40 70 100 200 275
0
Ambient Temperature [ C]
ENVIRONMENTAL SPECIFICA TIONS
T emperature Co-efficient
+120 ppm/ °C for < R10; +90 ppm/ °C for < 1R0; +60ppm/ °C for < 100R;
+100ppm/ °C or +30ppm/ °C for >100R depending on wire selected. [T est method no. 304 of MIL 202 F]
Moisture resistance Load life
Max. ∆R+[3% + R05]. Max. ∆R+[3.5% + R05].
No mechanical damage. No mechanical damage.
[T est method no. 106 E of MIL 202 F] [T est method no. 108 A of MIL 202 F]
Note : The temperature rise graph is indicative of general behaviour and is given for the guidance of designers.
However if the data required is critical please refer to the factory as the curve could vary depending on
power rating and resistance value.
Dielectric withstanding voltage
Max. ∆R+(1%+R05). No flashover, mechanical
damage, arcing or insulation breakdown.
[T est method no. 301 of MIL 202 F]
Insulation resistance
> 1000 M (dry) > 100 M (wet)
[T est method no. 302 of MIL 202 F]
Short time overload
Max. ∆R+(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]
10 20 30 40 50 60 70 80 90 100
Percentage of nominal power
at an ambient temperature of 25°C
0
Temperature rise [ C]
275°
200°
°C
100°
Temperature rise curve