VHIA
SERIES
WIRE WOUND RESISTORS
SILICONE COATED TYPE
Power Silicone "Thermo Coat" Wire Wound Resistors
Industrial / Professional Applications
HIGH SURFACE TEMPERATURE
TM
Alloy Resistance Wire wound
To Specific Parameters On
High Thermal Conductivity
Ceramic Core
Fully Welded
Construction
Flame Retardant
Thermocoat
Tin Plated
®
Copper Weld
Small Size : Power Ratio
0.5W to 10 Watts ( at 25°C )
Tolerances as close as 1%
R01 to 100K
TCR as low as +20ppm/°C available depending on
application and resistance value
PHYSICAL CONFIGURATION
IL
fdfD
I
LM
0.5MC 0.5W 7.0 2.7 38 0.5 30 R01 1K2 0.21
4W 16.5 6.9 38 1.02 40 R01 12K 2.1
3MC 3W 12.5 5.1 38 0.8 35 R01 7K0 0.7
3C 3W 15.2 6.0 38 0.8 40 R01 12K 0.78
4MC 4W 13.2 5.5 38 0.8 35 R01 6K8 0.9
2.5C1 2.5W 13.0 5.5 38 1.02 35 R01 10K 1.8
2.5C 2.5W 13.0 5.5 38 0.8 35 R01 10K 1.2
5C1 5W 23.5 8.5 38 1.02 45 R01 39K 4.2
5C 5W 23.5 8.5 38 0.8 45 R01 39K 4.2
4CL
7C1 7W 32.5 9.5 38 1.02 55 R01 68K 5.0
10W 45.0 10.0 38 0.8 65 R01 100K 7.5
1MC 1W 10.7 3.2 38 0.5 30 R01 3K6 0.36
4C
4W 23.0 7.2 38 0.8 45 R01 39K 3.6
10C1 10W 45.0 10.0 38 1.02 65 R01 100K 7.5
10C
HTR
TYPE
POWER
RATING
at 25°C
(Ambient)
DIMENSIONS (mm) RESISTANCE
RANGE
min max
TYPICAL
WT.
PER PC
(gms)
L
(max) l
+1.5 LM
+1
D
(max) d
+0.05
For non-inductive types and for resistance values < 1R0 + 0.8mm allowed.
For resistance values less than
R10 and tolerance less than +2%
please measure resistance over
centered length LM.
Note
1. The standard terminals in this
®
series is tinned Copper Weld .
2. Resistors for use under pulse
conditions as per IEC Pub:
61000-4-5 are available in this
series.
Low inductance Aryton - Perry
winding type resistors are
available in this series. For non-
inductive types reduce
maximum resistance values
shown to 50% and the continuous
working voltage to 70%.
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.
NON INDUCTIVE RESISTOR
PRE-FORMED LEADS
WIRE WOUND RESISTORS
SILICONE COATED TYPE
VHIA
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 - 25°C
Full power dissipation at upto 25°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],
[Test method no. 303 of MIL 202 F]
ELECTRICAL DATA/CHARACTERISTICS
DERATING CURVE
100%
83.5%
50%
0
Rated Dissipation [%]
25 70 100 200 275
0
Ambient Temperature [ C]
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
Dielectric withstanding voltage
Max. DR+(1%+R05). No flashover, mechanical
damage, arcing or insulation breakdown.
[Test method no. 301 of MIL 202 F]
Insulation resistance
> 1000 M (dry) > 100 M (wet)
[Test method no. 302 of MIL 202 F]
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]
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 Load life
Max. DR+[3% + R05]. Max. DR+[5% + R05 ohms].
No mechanical damage. No mechanical damage.
[Test method no. 106 E of MIL 202 F]. [Test method no. 108 A of MIL 202 F].
MECHANICAL SPECIFICATIONS
Pull test Solderability
No mechanical damage. Continuous and satisfactory.
[Force supplied from 2 to 4.5 Kgs depending on size]. [Test method no. 208 F of MIL 202 F].
WIRE WOUND RESISTORS
SILICONE COATED TYPE
VHIA
TM
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
VHIA R01 J0.5MC
ORDERING INFORMATION
Taping Types 0.5MC,1MC, 4C, 3C, 3MC, 4MC, 2.5C1, 2.5C, 5C1, 5C & 4CL are available in taped form.
on request.
Note : In case non inductive type is required please prefix HTR TYPE with 'N' eg : N1MC.
Please
refer tape/ammo pack specifications. Tape/Reel
