TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
Flame Retardant
Thermocoat
Fully Welded
Construction
Tin Plated
Copper Weld
®
SERIES
HIGH SURFACE TEMPERATURE
Power Silicone "Thermo Coat" Wire Wound Resistors
Industrial / Professional Applications
VHIA
Alloy Resistance Wire wound
To Specific Parameters On
High Thermal Conductivity
Ceramic Core
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
I
L
I
fd
fD
LM
For resistance values less than
R10 and tolerance less than +2%
please measure resistance over
centered length LM.
RESISTANCE TYPICAL
WT.
RANGE
min
max PER PC
(gms)
HTR
TYPE
POWER
DIMENSIONS (mm)
RATING
at 25°C
L
D
l
d
LM
(Ambient)
(max) (max) +1.5 +0.05 +1
0.5MC
1MC
4C
3MC
3C
4MC
2.5C1
2.5C
5C1
5C
4CL
7C1
10C1
10C
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
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
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.
NON INDUCTIVE RESISTOR
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%.
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.
For non-inductive types and for resistance values < 1R0 + 0.8mm allowed.
TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
VHIA
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.
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]
0
25
70 100
200
0
DERATING CURVE
100%
Rated Dissipation [%]
83.5%
50%
275
Ambient Temperature [ C]
275
°
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]
°
C
10 20 30 40 50 60 70 80 90 100
Percentage of nominal power
at an ambient temperature of 25
°
C
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].
Te
m
pe
100
°
ra
tu
re
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 [
0
C]
ris
e
cu
200
°
rv
e
TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
VHIA
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.
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