TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
Alloy Resistance Wire, wound to
Specific Parameters On High
Thermal Conductivity Ceramic Core
SERIES
PRECISION POWER
Silicone Coated Wire Wound Resistors
Industrial / Professional Applications
Flame Retardant
Thermocoat
HIA
All Welded Cap
And Lead Assembly
Flame retardant coating.
0.5 W to 15 W.
Tolerances as close as 0.25%
R 01 to 100 K
TCR as low as + 20ppm / °C available depending
on application and resistance value.
Special types available for pulse applications-IEC 61000-4-5.
APPLICABLE STANDARDS
ML- R 26 Char. U, EIA-RS-155-B Char. G, JIS-C 6401 Char. G, IEC - Pub 266 and Pub 266 A / T
ype 2D / 2F.
PHYSICAL CONFIGURATION
I
L
I
φd
LM
φD
HTR
TYPE
POWER
RATING
at 40°C
(Ambient)
DIMENSIONS (mm)
L
(max)
D
+0.5
l
d
+1.5 +0.05
LM
+1
RESISTANCE TYPICAL
RANGE
WT.
min
max PER PC
(gms)
For non-inductive types and for
resistance values < 1R0 + 0.8mm
allowed.
Coating overflow on each lead not
to exceed half of ‘D’.
For resistance values less than R10
and tolerance less than +2% please
measure resistance over centered
length LM.
NON INDUCTIVE RESISTORS
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% (Please refer to note (1) of
ordering information for placing
orders).
PULSE TYPE RESISTORS
Resistors for use under pulse
conditions as per IEC - 61000 - 4 - 5
available. For further information
please refer to
“Understanding
pulse & over load capability of wire
wound resistors”.
In case a tailor-made pulse resistor
is required, please refer to
"Questionnaire of data required"
and provide data accordingly.
H-0.5 0.5W
D-0.5
H-1
1W
H-2
2W
D-2
2W
(70°C)
H-3A
3W
H-3
3W
H-4
4W
H-5A
5W
D-5
5W
(70°C)
H-5
5W
H-7A
7W
H-7
7W
H-10A 10W
H-10
10W
H-15
15W
7.0
9.5
11.5
14.0
12.5
15.5
16.0
19.5
22.5
25.0
32.5
39.0
45.0
54.0
45.0
4.0
4.0
4.5
5.5
5.5
6.0
6.0
6.5
7.5
8.5
9.5
8.5
9.5
8.5
10.0
38
38
38
38
38
38
38
38
38
38
38
38
38
38
38
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
1.0
30
30
35
35
35
35
40
40
45
45
55
60
65
75
65
R01
1K2
0.55
0.6
0.8
1.1
1.1
1.2
1.3
2.0
3.1
3.3
5.0
5.4
5.7
6.3
5.9
R01 3K5
R01 5K6
R01 10K
R01 10K
R01 12K
R01 12K
R01 20K
R01 20K
R01 39K
R01 68K
R01 70K
R01 100K
R01 100K
R01 100K
TM
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
tape/ammo pack specifications. Tape/Reel
on request.
ELECTRICAL DATA/CHARACTERISTICS
Resistance tolerances available
+10% [K], +5% [J], +3% [H] +2% [G], +1% [F], +0.5%
[D], +0.25% [C] [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 - 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]
275
°
DERATING CURVE
100%
Rated Dissipation [%]
83.5%
50%
0
40
70 100
200
0
275
Ambient Temperature [ C]
Insulation resistance
> 1000 M (dry) > 100 M (wet)
[Test 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]
°
C
10 20 30 40 50 60 70 80 90 100
Percentage of nominal power
at an ambient temperature of 25
°
C
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.
ENVIRONMENTAL SPECIFICATIONS
Temperature 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. [Test method no. 304 of MIL 202 F]
Moisture resistance
Max.
∆R+[3%
+ R05].
No mechanical damage.
[Test method no. 106 E of MIL 202 F]
Load life
Max.
∆R+[3.5%
+ R05].
No mechanical damage.
[Test method no. 108 A of MIL 202 F]
Te
m
pe
100
°
ra
tu
re
Dielectric withstanding voltage
Max.
∆R+(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
HIA
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]
TYPICAL APPLICATIONS
The usage of HIA series resistors will expand circuit design limits significantly because they have precision
resistor characteristics with low TC and are able to carry load at high ambient temperatures.
HIA series can effectively be used in all industrial, electrical, electronic and telecommunication equipment
where large power dissipation is required (e.g. when used as a voltage divider or bleeder resistor in DC power
supplies or for series dropping). They are generally satisfactory for use at frequencies upto 50 KHz.
HIA series when wound by the Aryton-Perry method can be used effectively for high frequency applications
where fast rise time and minimum phase shift AC characteristics are necessary.
ORDERING INFORMATION
HIA
H2
100R
J
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
Note :
(1) In case non inductive type is required please prefix HTR TYPE with 'N' eg : NH - 2
(2) Type H5, H7, H7A, H10 and H10A can be supplied with lead diameter of 1.0 mm. Please specify to
avoid confusion.
(3) In case Pulse type is required please suffix HTR Type with ‘I’ eg. H3I
The Words - “Applicable standards” do not necessarily signify certification to that standard, however the tests
mentioned are carried out on the broad based guidelines set out in these standards.
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