TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
Flame Retardant
Thermocoat
Fully Welded
Construction
SERIES
HIGH SURFACE TEMPERATURE
Power Silicone "Thermo Coat" Wire Wound Resistors
Industrial / Professional Applications
HTA
Alloy Resistance Wire wound
To Specific Parameters On
High Thermal Conductivity
Ceramic Core
Axial Termination
Flame retardant coating compatible
with UL standards
0.75 W to 12 Watts
Tolerances as close as 1%
TCR as low as + 20ppm / °C [on request]
Pulse types available as per-IEC - 61000 - 4 - 5.
APPLICABLE STANDARDS
JSS- 50402 [Pattern RFHT - 1], IS - 8909 [Type FRP3]
IEC-Pub 266 and Pub 266 A [Type - 2E]
NON INDUCTIVE RESISTORS
PHYSICAL CONFIGURATION
I
φd
L
I
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).
φD
LM
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.
HTR
TYPE
POWER
DIMENSIONS (mm)
RESISTANCE TYPICAL
RATING
RANGE
WT.
d
at 70°C
max PER PC
D
+0.08 I
LM
min
L
(Ambient)
(max)
(max)
-0.05 +1.5 +1
(gms)
0.75W
2.5W
6W
9W
12W
9.0
13.0
23.0
39.0
53.0
3.5
5.5
8.0
8.0
8.0
0.8
0.8
0.8
0.8
0.8
38
38
38
38
38
30
35
45
60
75
R05 2K2
R05 10K
R05 33K
R05 68K
R05 100K
0.6
1.1
3.2
5.4
6.3
H-1B
H-2B
H-6
H-9
H-12
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. Depending
on application the resistor leads
may be tin plated Copper Weld
®
instead of tin plated copper.
For resistance values less than R10 and tolerance less than +2% please
measure resistance over centered length LM
TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
HTA
TAPING
Types H-1B, H-2B, & H-6 can be supplied in taped form. Please refer tape/ammo pack specifications on page
no. 81. Tape/Reel on request.
ELECTRICAL DATA / CHARACTERISTICS
Resistance Tolerances Available
+ 10% [K], + 5% [J], + 3% [H] + 2% [G], +1% [F]
[Test method no. 13.2 of JSS - 50402 and 50400]
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.
Voltage Proof - Dielectric Withstanding Voltage
[applicable to insulated styles only]
No breakdown or flashover
[Test No. 13.3.1 of JSS - 50400]
Insulation Resistance
1000 M [Dry]
[Test No. 13.4 of JSS - 50402 and JSS - 50400]
Rated Ambient Temperature - 70°C
Full power dissipation at upto 70°C and linearly
derated down to zero dissipation at 350°C.
[See derating curve below]
DERATING CURVE
Rated Dissipation [%]
100
60
20
0
25
70 100
150
200
250
300
350
Ambient Temperature [°C]
Short-time Overload
Max.
∆R
+ (2% + R05)
[Test No.13.19 of JSS - 50402 and JSS - 50400]
ENVIRONMENTAL SPECIFICATIONS
Temperature Cycling
Max.
∆R
+ (2% + R05)
[Test No.13.14 of JSS - 50402 and JSS -
50400]
Climatic and Damp Heat
Max.
∆R
+ (<5%). No physical damage.
[Test No.13.15 and 13.16 of JSS - 50402
and
JSS -50400]
[Severity H - 13]
Life (Electrical)
Max.
∆R
+ (<5% + R05).
[Test No.13.17 of JSS - 50402 and JSS - 50400]
Flammability
Within the specified limits.
[Test No. 10 of JSS - 50101]
Temperature Characteristic of Resistance
+100 to 200 ppm / °C, can be significantly
lowered on request.
[Test No. 13.24 of JSS - 50402 and JSS - 50400]
MECHANICAL SPECIFICATIONS
Pull Test
No mechanical damage
[Force applied from 2 to 4.5 Kgs depending
on size]
Solderability
Continuous and satisfactory
[Test method No. 19 of JSS 50101]
TM
WIRE WOUND RESISTORS
SILICONE COATED TYPE
HTA
TYPICAL APPLICATIONS
HTA series is unique due to its special flame proof "Thermocoat" which resists hot spot temperature of 350
°
C
and uses specially selected resistance elements and substrates.
These unique features can be effectively used by the circuit designer in all industrial, electrical, electronic
and telecommunication equipment where large power dissipation : size ratio are required and where the
ambient operating temperature is elevated without sacrificing accuracy and reliability.
HTA series when wound by Aryton-Perry method can be used effectively for high frequency applications, if
required.
ORDERING INFORMATION
HTA
H-6
50R
J
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
Note :
(1) In case non-inductive type is required, please prefix HTR type with 'N' eg : NH-6.
(2) In case pulse type is required please suffix HTR type with ‘I’ for e.g. H2BI.
(3) When thermal efficient cores are used the type shall be suffixed with alphabet ‘A’.
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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