Metal Element
Current Sense Resistor
ULR Series
•
•
•
•
•
•
Robust metal strip able to withstand high temperature and high current.
Low TCR and Inductance
Resistance Range from 0.5 mΩ to 20 mΩ
Power ratings from 1W to 3W in 1206, 2010 and 2512 chip size
Designed for current sense circuits in power electronic systems
Higher wattage devices feature PCB clearance gap to maximize thermal
performance
Electrical Data
IRC Type
Coating
1
Power rating
at 80°C (Watts)
Standard Resistance
Values (mΩ)
2
TCR
Tolerance
Dielectric
(±ppm/°C)
(±%)
Withstanding Voltage
(Volts)
50
50
50
50
50
100
50
150
100
50
1, 5
200
1, 5
1, 5
100
100
1206 Chip Size
ULR-1
ULR-15
ULR-1
ULR-2
ULR-25
ULR-3
ULR-1
ULR-2
Green
Green
Green
1
1.5
1
2
2.5
3
1
2
1, 2, 3, 5, 7, 10
1, 2, 3, 5, 7, 10
11 - 20
7 - 10
4-6
0.5 - 0.75
1-3
2.5 - 3
4-5
0.5 - 2
2010 Chip Size
2512 Chip Size
Black
Notes:
1.Black coating = wave or IR reflow soldering; Green coating = IR reflow solder. Wave reflow - solder mask must match the W and D dimensions on page 2
of data sheet. 2Non-standard resistance values available (contact factory). For resistance values above 20 mΩ, please refer to our LRC / LRF series.
Environmental Data
Test
Short Term Overload (5x rated power for 5 seconds)
Load at rated power (1000 hours cyclic load @ 70°C)
Temperatature Cycling (-55°C to +150°C; 100 cycles)
Dry Heat (+155°C, no load; 96 hours)
Resistance to Solder Heat (260°C for 10 seconds)
Solderability (235°C for 2 seconds)
Resistance to Solvents
Operating Temperature
∆R/R ≤
± 0.5% + 0.5 mΩ (black);
∆R/R ≤
± 1% (green)
∆R/R ≤
± 1% + 0.5 mΩ (black);
∆R/R ≤
± 1% (green)
∆R/R ≤
± 0.5% + 0.5 mΩ (black);
∆R/R ≤
± 1% (green)
∆R/R ≤
± 1% + 0.5 mΩ (black);
∆R/R ≤
± 1% (green)
∆R/R ≤
± 0.5% + 0.5 mΩ (black);
∆R/R ≤
± 1% (green)
Minimum 95% coverage
No deterioration of protective coating or marking
-55°C to 170°C
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
A Subsidiary of
TT electronics plc
ULR Series Issue August 2008 Sheet 1 of 4
Physical Data
D
T
W
L
Coating
Resistance
Value (mΩ)
(1 Watt)
1.0 - 10
L
W
T
D
1206 Chip Size
Green
3.2 ± 0.25
1.6 ± 0.10
0.6 ± 0.2
0.98 ± 0.38
2010 Chip Size
Green
(1.5 Watt)
1.0 - 10
5.08 ± 0.25
2.54 ± 0.15
0.6 ± 0.2
1.67 ± 0.63
2512 Chip Size
(2 Watt, 2.5 Watt, and 3 Watt)
0.5
0.75
1 - 1.5
2-3
4
5-6
7
8 - 20
0.5
0.75
1
1.5
1.4 ± 0.2
1
1.0 ± 0.2
1
0.8 ± 0.2
1
0.65 ± 0.2
1
6.35 ± 0.25
3.18 ± 0.25
0.5 ± 0.2
1
1.0 ± 0.2
1
0.7 ± 0.2
1
0.6 ± 0.2
1
0.5 ± 0.2
1
1.43 ± 0.38
2.68 ± 0.25
2.48 ± 0.25
1.43 ± 0.25
6.35 ± 0.25
3.18 ± 0.35
0.6 ± 0.2
1.18 ± 0.25
2.18 ± 0.25
1.93 ± 0.25
1.43 ± 0.25
1.18 ± 0.25
Green
Black
2
2.5
3
4
5
Note:
1
Dimensions are for reference only
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
ULR Series Issue August 2008 Sheet 2 of 4
Electrical Connections
2512 Package
4-wire pad layout
1.8
1.45
1.0
4.75
unit: mm
unit: mm
unit: mm
4.75
3.6
1.5
0.5
2-wire pad layout
1.8
4-wire precision measurement points
5.4
2010 Package
4-wire pad layout
1.44
1.16
0.8
3.8
2-wire pad layout
4-wire precision measurement points
1.44
4.32
3.8
0.5
3.12
1.2
unit: mm
unit: mm
unit: mm
1206 Package
4-wire pad layout
2-wire pad layout
4-wire precision measurement points
0.9
0.725
0.5
2.38
0.9
2.7
2.38
0.25
1.95
0.75
unit: mm
unit: mm
unit: mm
Note:
1
Green parts require the use of “D” dimensions on page 2 for parts being assembled in a wave reflow processes.
Power Derating Curve
Note:
Rated Power (%)
100
50
0
0
85
170
The power derating curve is a guidance based on a conserva-
tive design model. The ULR is a solid metal alloy construc-
tion that can withstand significantly greater operating temper-
atures than the conservative model permits. The protective
coating will operate up to 260°C and the alloy can withstand
in exess of 350°C. Therefore, the system thermal design will
be a more significant design parameter due to the heat limita-
tions of the solder joint.
Ambient Temperature (°C)
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
ULR Series Issue August 2008 Sheet 3 of 4
Construction
Black Type
Black Type
Green Type
A low TCR resistance alloy plate with plated connection bands is protectively coated and numerically marked with the resistance value,
as described in Product Marking. This version has standard plated connection and is suitable for wave or IR reflow soldering processes.
Green Type
A low TCR alloy plate is grooved to set the
fi
nal resistance. The lower faces are solder plated for connections, and the top surface is pro-
tectively coated and numerically marked with the resistance value, as described in Product Marking. This part is suitable for wave and IR
reflow soldering processes. Wave reflow requires the solder mask to be dimensioned according to page 2 using the W and D dimensions
of the part.
Product Marking
Part resistance is indicated by using two marking notation syles:
• 4-digit: R002 = 2 mΩ; R designates the decimal location in ohms.
• 3-digit: 1M5 = 1.5 mΩ; M designates the decimal location in milli-ohm.
Plastic Tape Specification
Top Tape
ψD
A
B
0
E
F
W
T
Emboss Tape
Size
2512
2010
1206
Resistor
P
1
P
2
P
0
ψD
direction of unreeling
1
1.4Min.
Resistance
(mΩ)
0.5 - 7
0.5 - 20
1 - 10
A
3.4±0.1
2.85±0.1
B
6.73±0.1
6.75±0.1
5.55±0.1
W
12±0.1
12±0.1
E
1.75±0.1
1.75±0.1
1.75±0.1
F
5.5±0.05
5.5±0.1
3.5±0.1
P0
4±0.1
4±0.1
4±0.1
P1
4±0.1
4±0.1
4±0.1
P2
2±0.05
2±0.05
2±0.05
Φ
D0
1.5±0.1
1.55±0.1
1.55±0.1
1.55±0.1
T
0.81±0.1
0.80±0.1
0.85±0.1
0.87±0.1
1 - 10
1.9
±0.1
3.6
±0.1
8
±0.2
Note:
1.
2.
3.
4.
5.
The cumulative tolerance of 10 sprocket hole pitch is ± 0.2 mm.
Carrier camber shall not be more than 1 mm per 100 mm through a length of 250 mm.
A & B measured 0.3 mm from the bottom of the packet.
T measured at a point on the inside bottom of the packet to the top surface of the carrier.
Pocket position relative to sprocket hole is measured as the true position of the pocket and not the pocket hole.
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Wire and Film Technologies Division
ULR Series Issue August 2008 Sheet 4 of 4
Packaging Quantity
Series
Emboss Plastic Tape
2512
2010
1206
2,000
2,000
2,000
Ordering Data
Specify type, resistance, tolerance, ROHS compliance and packaging.
Example: Metal Element Current Sense Resistor, 1-watt, 10 mΩ resistor.
Sample Part No.
ULR
1
2512
R010
F
LF
SLT
IRC Type
Power Rating
(see specs table)
Package Size
Resistance Value (EIA 4-digit code)
Example: 0.010 = R010
Tolerance (EIA format)
F = 1%
J = 5%
RoHS - Compliance
LF = RoHS compliant Construction
Packaging
SLT = Standard Lead Tape
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
ULR Series Issue August 2008 Sheet 5 of 4
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