- The document provides specifications for HTR brand low ohm power resistors in the HOS series.
- It describes the physical and electrical characteristics including dimensions, resistance values from R001 to R05, temperature coefficients, and power ratings.
- Key features noted are reduced PCB heating compared to flat chip resistors due to an open frame strip design and flexible termination for thermal expansion.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
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GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
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1. • Open frame strip type.
• 2W to 5W.
• R001 to R05.
LOW OHM
POWER RESISTORS
HOS
SERIES
Size 4512
e : info@htr-india.com
www.htr-india.com
Rev Date : 01/04/2021
AEC-Q200Qualified
3. LOW OHM
POWER
RESISTORS
HOS
Size 4512
e : info@htr-india.com
www.htr-india.com
Rev Date : 01/04/2021
Note :
Temperature rise data
are given here for typical
mounting conditions. Ac-
tual figures depend on PCB
copper weight, mounting
pad size, track width and
substrate type. Also, the
open air format responds
better to forced air cooling
than chip format resistors.
For values below 5 mil-
liohms allowance should
be made for heat generated
in the copper tracks them-
selves. Application-specific
guidance is available on re-
quest from our application
laboratory.
Hot Spot Temperature Rise
Mounting data : 7.6mm X 7.6mm pads, 2 oz copper on FR4, still air
25%
0
50
100
150
200
250
300
50% 75% 100%
Temperature
Rise
(K)
Percentage of Rated Power
Resistance Value
in milliohms
HOS 2W / 3W & 5W
50 / 25
30 /15
10 / 5
5 / -
Solder Joint Temperature Rise
Mounting data : 7.6mm X 7.6mm pads, 2 oz copper on FR4, still air
25%
0
20
40
60
80
100
50% 75% 100%
Temperature
Rise
(K)
Percentage of Rated Power
Resistance Value
in milliohms
HOS 2W / 3W & 5W
5 / -
10 / 5
30 / 15
50 / 25
0
20
40
60
80
100
50 100 150 200 250
Rated
Dissipation
(%)
Ambient Temperature (ºC)
Temperature Derating
Resistance Value in milliohms
Pulse Energy Rating
NOTE : This graph relates to single pulses of short duration (≤ 100ms).
Higher energy limits apply for longer pulses and overloads.
HOS 2W / HOS 3W HOS 5W
0
1
20
40
60
80
100
120
10 100
Energy
(J)
4. e : info@htr-india.com
www.htr-india.com
ELECTRICAL AND ENVIRONMENTAL CHARACTERISTICS
Power Rating (Rated Ambient Temperature ) Full power dissipation at 70° C and linearly
de-rated to zero at + 225° C
Insulation Not Insulated
Resistance Tolerance ± 5% (Available up to ± 1%)
Inductance < 10 nH
Operating Temperature Range - 55° C to +160° C
Voltage Rating / Limiting Voltage / Max. Working Voltage P x R
subject to max. terminal temperature + 120° C
For – HOS2W & HOS3W
240ppm – For Resistance value < R004.
40ppm – For Resistance value R004 to R015
40ppm – For Resistance value > R015.
Temperature Co-efficient of Resistance For – HOS5W
[Measured from 0°C to +125°C] 240ppm – For Resistance value < R002.
40ppm – For Resistance value R002 to R007.
40ppm – For Resistance value > R007.
Thermal Shock
∆R ± [ 0.75 ] – Average
For – HOS2W HOS3W
∆R ± [ 1.0 % ] – For Resistance value R004.
∆R ± [ 1.0 % ] – For Resistance value R004 to R015.
Temperature Cycling ∆R ± [ 0.75 % ] – For Resistance value R015.
[Room temperature -55°C Room temperature 125°C For – HOS5W
Room temperature for 5 cycles] ∆R ± [ 1.0 % ] – For Resistance value R002.
∆R ± [ 1.0 % ] – For Resistance value R002 to R007.
∆R ± [ 0.75 % ] – For Resistance value R007.
For – HOS2W HOS3W
∆R ± [ 1.75 % ] – For Resistance value R004.
∆R ± [ 0.5 % ] – For Resistance value R004 to R015.
∆R ± [ 1.0 % ] – For Resistance value R015.
High Temp. Exposure ( 125°C- For 2 Hrs.) For – HOS5W
∆R ± [ 1.75 % ] – For Resistance value R002.
∆R ± [ 0.5 % ] – For Resistance value R002 to R007.
∆R ± [ 1.0 % ] – For Resistance value R007.
Damp Heat ( Steady State ) ∆R ± [ 0.5 % ] – Average
( 40°C at 93 % R.H. for 1000 Hrs. – no load applied )
For – HOS2W HOS3W
∆R ± [ 2.0 % ] – For Resistance value R004.
∆R ± [ 1.0 % ] – For Resistance value R004 to R015.
Endurance – Load Life ∆R ± [ 1.0 % ] – For Resistance value R015.
[ 70°C with limiting voltage – For – HOS5W
with temperature limitation on terminal kept at 120°C ∆R ± [ 2.0 % ] – For Resistance value R002.
1.5 hours on / 0.5 hours off for 1000 hours] ∆R ± [ 1.0 % ] – For Resistance value R002 to R007.
∆R ± [ 1.0 % ] – For Resistance value R007.
Bias Humidity [+85° C, 85% RH, 1000h] ∆R ± 0.5% -Typical
Mechanical Shock [100 g. 6 ms half sine] ∆R ± 0.5% -Typical
Vibration, High Frequency [20 g. 10-2000 Hz] ∆R ± 0.5% -Typical
LowTemperature Storage and Operation [-65° C for 24 h] ∆R ± 0.2% -Typical
Moisture Resistance [MIL-STD-202 method106] ∆R ± 0.2% -Typical
PARAMETER / PERFORMANCE TEST TEST METHOD PERFORMANCE REQUIREMENTS
HOT SPOT TEMPERATURE RISE (IN STILL AIR) -
From 180 °C to 280 °C at 100% power depending on the resistance value, pad and PCB thickness. Due to the nature of it’s construc-
tion, the HOS resistor keeps the hot spot from a thermal point of view from the solder joints and reduces the possibility of transfer
of high temperature on to the PCB in contrast to the flat chip format.
SOLDER JOINT TEMPERATURE RISE (IN STILL AIR) -
From 60 °C to 85 °C at 100% power depending upon resistance value, pad and PCB thickness.
CONSTRUCTION :
The copper terminals are electron beam welded to the requisite alloy strip and then formed. Value variations are possible by varia-
tions of width without traditional abrasion / notch trimming.
Rev Date : 01/04/2021
LOW OHM
POWER
RESISTORS
HOS
Size 4512
5. www.htr-india.com
e : info@htr-india.com
PACKAGING
A. BULK
1000 resistors are packed in sealed plastic packets with silica gel pouch and place in small cardboard carton (Type ‘I’ box) approx size
70 x 70 x 70 mm and 4 such boxes can be packed in Type ‘A’ box approx size 200 x 150 x 70mm. 36 boxes (36000 pieces) of Type ‘’I’ or 6
boxes (24000 pieces) of Type‘A’can be packed in master carton of approx size 320 x 245 x 245mm.
B. TAPE REEL PACKING
Storage Condition (Packed) : Temp 25°C to 35°C, Humidity 30 to 80% RH, Shelf life-12 months
Floor Life (Unpacked) : Temp 25°C to 35°C, Humidity 30 to 80% RH, Floor life-15 days
Part no. of HOS5W, bulk with Resistance value, R025 and 1% tolerance will be HOS5W R025 1%
Part no. of HOS5W, Tape reel with Resistance value, R025 and 5% tolerance will be HOS5WTR R025 5%
+
_
DIMENSIONAL TABLE
ORDERING INFORMATION
Sr No. HTR TYPE A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) H(mm) PCS/Reel
1 HOS2W HOS3W ≥ R003 4.32±0.1 11.7±0.1 24±0.3 11.5±0.1 1.75±0.1 8.0±0.1 4.0±0.1 4.5±0.1 2000 pcs.
2 HOS2W HOS3W R002 4.32±0.1 12.1±0.1 24±0.3 11.5±0.1 1.75±0.1 8.0±0.1 4.0±0.1 4.5±0.1 1750 pcs.
3 HOS5W R001 to R025 7.21±0.1 12.1±0.1 24±0.3 11.5±0.1 1.75±0.1 12.0±0.1 4.0±0.1 4.5±0.1 1250 pcs.
Rev Date : 01/04/2021
RECOMMENDED SOLDER PROFILE
Reflow, IR - and wave soldering
Temperature (°C) 260 255 217
Time (Sec) Peak 40 90
LOW OHM
POWER
RESISTORS
HOS
Size 4512
MECHANICAL SPECIFICATIONS
Resistance to Soldering heat - (350° C for 30 Secs) ∆ R ± [ 0.2 % ] – Typical
Solderabillity (Meets J-STD-002 Method B) Must meet the requirements laid down
Solvent Resistance (Meets MIL-STD-002 Method 215) Must meet the requirements laid down
PARAMETER / PERFORMANCE TEST TEST METHOD PERFORMANCE REQUIREMENTS
Series HTR Part No. Type Resistance Value Tolerance Marking on Resistor
HOS HOS5W Bulk-HOS5W R025 ±1% HTR R025 1%
HOS HOS5W Tape Reel –HOS5WTR R025 ±5% HTR R025 5%