HFA
SERIES
WIRE WOUND RESISTORS
SILICONE COATED TYPE
APPLICABLE STANDARDS
PHYSICAL CONFIGURATION
Silicone Coated Wire Wound Resistor
Shatter Proof
Low Cost Due To Automation
FIBRE GLASS SUBSTRATE
IS - 8909 and IEC - Pub 266
100
120
80
40
040 80 120 160 200 240 275
Rated Dissipation [%]
Ambient Temperature [°C]
DERATING CURVE
70°C
d
D
I
L
ELECTRICAL AND ENVIRONMENTAL CHARACTERISTICS / DATA
Alloy Resistance Wire wound
On Fibre Glass Core
Flame Retardant
Silicone Coating
Mechanically Crimped
Termination Assembly
Especially designed for kitchen
appliances sector.
High positive temperature co-efficient
resistors available.
Available uncoated if required.
F-1 1W 13.0 4.5 38 0.8 R05 9K1 1.18
F-2 2W 16.0 4.5 38 0.8 R07 12K 1.20
F-3 3W 18.0 5.2 38 0.8 R10 15K 1.24
F-5 5W 30.0 5.2 38 0.8 R10 27K 1.73
F-7 7W 39.0 5.2 38 0.8 R10 39K 2.03
F-9 9W 45.0 5.2 38 0.8 R10 47K 2.22
F-10 10W 54.0 5.2 38 0.8 R10 51K 2.34
HTR
TYPE
POWER
RATING
at 70°C
RESISTANCE
RANGE
min max
L
+2 l
+2 d
+0.05
D
+0.5
TYPICAL
WT.
PER PC
(gms)
DIMENSIONS (mm)
TM
Performance Requirements
Test
Resistance tolerance + 10% [K]; + 5% [J]
Rated ambient temperature at 70°C full power dissipation
[ see derating curve]
Temperature co-efficient + 100 ppm/ °C [> 100R]
+ 80 ppm/ °C [< 100R]
+ 450 ppm/ °C [< 1R0]
Short time overload Max DR + [ 2%+R05]
Moisture Resistance Max DR + [5%+R05]
Load life Max DR + [5%+R05]
Ambient operating
temperature range. -40°C to +155°C
WIRE WOUND RESISTORS
SILICONE COATED TYPE
HFA
Note :
1) The leads of the resistor can be bent and cut as per requirements for quick PCB mounting.
Please send detailed drawings of the type of preforming required.
2) Types F1, F2 & F3 can be supplied in taped form. Please refer to
on request.
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.
tape/ammo pack specifications.
Tape/Reel
TOLERANCE
RESISTANCE VALUE
HTR TYPE
SERIES
HFA 50R JF5
ORDERING INFORMATION
TYPICAL APPLICATIONS
HFA series of resistors were developed to provide a reliable but low cost alternative to the kitchen appliances
sector where medium levels of power are required to be dissipated in the confines of a PCB and where close
tolerance is not a criteria for selection.
This cost reduction is achieved using a sophisticated automatic plant where the resistance element is uniformly
wound onto a fibre glass core which is shatterproof.
Finally the sub-assembly is conformally coated with a special silicone cement coating which cannot drip even at
high overloads or left uncoated if required by the customer.
Due to this method of construction, resistors in this series particularly above 7W should be suitably derated (about
35%) and a clearance of say about 5 mm from the PCB be kept if found necessary.
Depending on application the resistors leads may be tin plated Copper Weld instead of tin plated copper.
®
TM
