Resistors
Low Resistance
Metal Alloy Resistor
LRMA Series
Low Resistance
Metal Alloy Resistor
Resistance range 0.5mΩ to 300mΩ
LRMA Series
High temperature operation to 170°C
Resistance range 1 to
•
Low thermal EMF version
100mΩ
High temperature
•
High power version
operation to 170°C
•
Current sensing for power electronics
Low thermal EMF version
•
High power version
RoHS compliant & halogen free
•
Current sensing for power electronics
RoHS compliant
•
AEC-Q200 qualified
& halogen free
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
Power rating
@70°C
Overload rating
(5s)
Resistance range
Standard values
1
LRMA Version
Size
W
W
mΩ
mΩ
1.5
7.5
5 to 100
5, 6, 10, 15,
20, 50, 100
≥R01:
±75
2010
T (Standard)
2512
≤R01:
2, >R01: 1
≤R01:
10, >R01: 5
1 to 100
≤R10: 3, >R10: 2
≤R10: 15, >R10: 10
0.5 to 300
0.5, 0.75, 1, 1.1, 1.5, 2, 2.5, 3, 4, 5, 6, 6.8, 7, 8, 9, 10, 11, 12, 15, 18,
P (Power)
2512
1, 1.5, 2, 3, 3.5, 4, 5, 6, 7, 8, 10, 11, 12,
20, 22,25, 27, 30, 33, 39, 40, 45, 47, 50, 57, 60, 68, 70, 75, 80, 85,
15, 18, 20, 25, 30, 33, 35, 40, 50, 100
90,100, 120, 130, 140, 150, 180, 200, 220, 240, 250, 270, 280, 300
>R001 &
<R01:
±100,
1, 5
≤ R001: ±275
-55 to 170
>100
±50
Resistance tolerance
1
TCR
(25 to 125°C)
Ambient temperature
Insulation resistance
Element alloy
%
ppm/°C
°C
MΩ
Cu-Ni
Cu-Ni / Mn-Cu
Power rating
@70°C
Overload rating
(5s)
Resistance range
Standard values
TCR
1
LRMA Version
Size
Resistance tolerance
1
(25 to 125°C)
0.5
1
5
2.5
5 to 25
1 to 50
5, 6, 8,9, 1, 1.2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14,
mΩ
10, 20, 25 15, 18, 20, 22, 25, 30, 39, 40, 50
%
±100
±50
W
W
mΩ
0805
M (Low thermal EMF)
1206
2512
ppm/°C
MΩ
Ambient temperature
Insulation resistance
Element alloy
Mn-Cu
≤R01:
2, >R01: 1
≤R01:
10, >R01: 5
0.5 to 60
0.5, 0.75, 1, 1.5, 2, 3.5, 5,
10, 20, 25, 30, 40, 50, 60
1, 5
≥R01:
±75, >R001 &
<R01:
±100 ≤R001: ±275
-55 to 170°C
>100
N (Inverse)
0612
0815
1 to 3
1, 3
1
5
2
3 to 30
3, 4, 5, 10,
15, 20, 25, 30
±100
3
15
2 to 40
2,3,4,5,10,15,
20,25,30,40
1225
Mn-Cu / Cu-Ni
2
Notes: 1. Non-standard values and tighter tolerances may be available for high volume requirements. 2. Requires 300mm copper pad & trace area
Physical Data
(All dimensions in mm and nominal weight in mg)
2.0 ±0.1
3.2 ±0.2
Size
0805
1206
<R002
1206
≥R002
0612
0815
2010
2512
<R001
2512
≥R001 & ≤R003
1
2512
>R003
1
1225
General Note
L
1.25 ±0.1
1.6 ±0.2
W
1.7±0.2
3.2±0.2
2.1 ±0.25 3.75 ±0.3
5.0 ±0.2
6.4 ±0.2
3.2 ±0.3
2.5 ±0.2
3.2 ±0.2
6.4 ±0.3
0.4 ±0.2
1.1 ±0.3
0.5 ±0.3
0.4±0.2
0.5 ±0.2
C
0.6 ±0.2
0.75 ±0.2
0.6 ±0.2
0.6 ±0.2
0.7 ±0.2
t
Wt
5.5
18.3
12.9
14.1
35.6
57 to 63
70
0.6 ±0.3
0.6 ±0.2
2.6 ±0.2
2.0 ±0.2 0.65 ±0.25
0.9 ±0.2
0.5 ±0.2
0.9 ±0.2
Note 1 - This applies to LRMAT2512 and LRMAM2512. For LRMAP2512 this threshold is R004
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
03.19
Low Resistance
Low Resistance
Metal Alloy Resistor
Metal Alloy Resistor
LRMA Series
LRMA Series
Construction
Copper electrode with
nickel then tin plating
Coating (UL94-V0)
Low TCR
resistance alloy plate
The components are marked with ohmic value, e.g. “R002” = 2mΩ, “R010” = 10 mΩ.
Due to space restrictions, for LRMAM1206-R001, "01" = 1mΩ is used, and for LRMAM0805,
“002” = 2mΩ, “010” = 10 mΩ are used.
Marking
Solvent Resistance
The component is resistant to all normal industrial cleaning solvents suitable for printed circuits.
Performance Data
Load at rated power
(cyclic load, 1000 hours at 70°C)
Short term overload
(5 x rated power for
5s)
Humidity
(1000 hours, 85°C, 85%RH)
Temperature cycle
(-40 to +125°C, 1000 cycles, 15 minute dwell)
Resistance to solder heat
(260°C ±5°C for 20s ±1s)
Solderability
(245°C ±5°C for 2s ±0.5s)
Dry heat
(1000 hours at 170°C)
Low temperature storage
(1000 hours at -55°C)
Substrate bending
(board 1.6mm, fulcrum spacing 90mm, deflection 2mm)
Insulation resistance
(1 minute @ 100Vdc)
±∆R
±∆R
±∆R
±∆R
±∆R
±∆R
±∆R
±∆R
0805: 1.5 Others 1
0.5
0805: 1 Others 0.5
0805: 1 Others 0.5
0.5
>95% coverage
0805: 1.5 Others 0.5
0.5
0805: 1 Others 0.5
>100M
Maximum (%)
Typical (%)
0.3
0.15
0.15
0.15
0.3
0.3
0.15
0.3
Thermal Performance & Mounting
Temperature Derating
Temperature Rise (°C)
Typical Temperature Rise
120
100
80
60
40
20
0
0%
20%
40%
60%
80%
100%
Proportion of Pr
Proportion of Pr
100%
80%
60%
40%
20%
0%
-30
20
70
120
170
Ambient Temperature (°C)
Hot spot
Joint
Note 1 - This applies to LRMAT2512 and LRMAM2512. For LRMAP2512 this threshold is R004
Reference Pad Dimensions (mm)
Size
a
b
L
3.8
0.7
0.7
0612
1.4
1.15
1.2
0805
1.8
2.3
1.0
1206
<R002
1206
≥R002
1.8
1.7
1.6
7.9
1.5
0.9
0815
3.4
1.5
3.5
2010
1
4.0
3.1
1.3
2512
≤R003
4.0
2.1
4.1
2512
>R003
1
7.0
1.0
2.3
1225
L
b
a
Current
Sense
The temperature rise shown is highly
dependent on mounting conditions.
Reference conditions assume 20
copper with thermal vias to multiple
layers.
The self-heating in the current tracks
should be kept negligible, or allowed
for by temperature derating.
Standard 4-terminal probe pitches for measuring unmounted parts are 2.8 x 1.7mm (0612), 0.4 x 1.83mm (0805),
0.4 x 2.8mm (1206), 1.2 x 4.5mm (2010), 1.5 x 5.8mm (2512), and 5.4 x 3.4mm (1225). All probe location tolerances
±0.02mm.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
03.19
Low Resistance
Metal Alloy Resistor
Metal Alloy Resistor
Low Resistance
LRMA Series
LRMA Series
Packaging
Bottom Tape
Wr
ΦC
ΦB ΦA
Paper Tape
Tr
Size
0805
Tape
Paper
0612,
Paper
1206
±0.15
±0.15
1.6
A
±0.2
±0.2
±0.2
±0.2
±0.2
2.4
B
±0.2
±0.2
±0.2
±0.05
±0.2
8.0
W
±0.05
±0.05
±0.1
±0.05
±0.05
3.5
F
1.75
E
±0.1
±0.1
±0.1
4.0
4.0
4.0
P
1
P
2
±0.1
±0.1
±0.05
±0.2
±0.05
±0.05
2.0
±0.1
±0.1
±0.1
4.0
P
0
ΦD
0
+0.1/-0
+0.1/-0
1.5
1.5
0.84
±0.1
t
ΦA
178
± 2
178
± 2
178
± 2
178
± 2
178
± 2
ΦB
ΦC
Wr
9
±1
9
±1
60
±1
13
±1
60
±1
13
±1
11.4
±1
Tr
2.0
3.6
4.5
8.0
12
3.5
5.5
1.75
1.75
1.75
1.75
±0.1
±0.1
±0.1
+-0.1
±0.1
2.0
2.0
4.0
4.0
0.84
±0.1
±0.1
11.5
±1
2.8
2010
Emboss
±0.2
2512
Emboss 3.6
±0.2
1225
2.6
0815
Emboss
±0.2
1.55
±0.05
+0.1/-0
+0.1/-0
1.1
5.3
12
5.5
4.0
2.0
6.9
12
5.5
±0.1
4.0
2.0
±0.05
±0.05
4.0
1.5
1.5
0.85
±0.15
60
±1
13
±1
13
±1
15.4
±2
15.4
60
±1
13
±1
13
±1
15.4
60
±1
13
±1
13
±1 ±2
±2
4.0
0.85
±0.15
Storage
Processing
Conditions:
5°C to 35°C and 40% to 75%RH
Shelf life:
2 years from manufacture
LRMA series resistors are suitable for both wave and IR reflow soldering. The recommended reflow profile for Pb-
free SAC305 alloy (Sn 96.5%, Ag 3%, Cu 0.5%) soldering is as follows:
Pre-heat:
60s to 120s at 150°C to 180°C
Soldering:
20s to 40s at
≥230°C
Peak:
5s at 255°C to 260°C
Ordering Procedure
Ordering
low thermal EMF version in 2512 size and at 10 milliohms and 1% tolerance packed in tape.
Procedure
Example: LRMA
Example: LRMAM2512-R01FT4
(LRMA2512, low
R M A M
EMF,
2 –
1
milliohms
4
L
thermal
2 5 1
10
R 0 1 F T
±1%, Pb-free)
Type
Version
T
P
L
R
M
1
A
M
2
2
2
5
3
1
2
-
1
R
0
1
4
F
5
T
6
4
M
1
N
Size
Value (use IEC62 code)
Type
3
Size
4
Value
5
Tolerance
F = ±1%
J = ±5%
6
Packing
Tape & reel
T5
0612, 0805, 1206
5000/reel
T4 0815, 2010, 2512, 1225 4000/reel
0612
3 to 6
characters
P
Power
0805
M Low thermal EMF 1206 R = ohms
Packing
N
Inverse
0815
T5
0612, 0805, 1206
5000/reel
2010
Tape
Standard
T4
0815, 2010, 2512
4000/reel
2512
Note 1: For values which require 6 characters, e.g. R00075, the hyphen is omitted.
1225
Tolerance (use IEC62 code)
LRMA T
Standard
F
J
1%
5%
Version
Note 1: For values which require all 6 characters, e.g. R00075, the hyphen is omitted.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
03.19
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
TT Electronics
:
LRMAM1206-R03FT5 LRMAM2512R005FT4 LRMAT2010-R02FT4 LRMAM2512R0005FT4 LRMAM0805-R02FT5
LRMAM1206-R005FT5 LRMAM2512R02FT4 LRMAM0805-R01FT5 LRMAT2010-R005FT4 LRMAM2512R05FT4
LRMAM1206-R01FT5 LRMAP2512R001FT4 LRMAP2512R01FT4 LRMAP2512R05FT4 LRMAP2512R002FT4
LRMAP2512R10FT4 LRMAM1206-R001FT5 LRMAM0805-R005FT5 LRMAM1206-R02FT5 LRMAM1206-R002FT5
LRMAT2010-R01FT4 LRMAP2512R005FT4 LRMAP2512R02FT4 LRMAM2512R01FT4 LRMAM2512R001FT4
LRMAP2512-R001FT4 LRMAP2512-R025FT4 LRMAT2512-R001FT4 LRMAT2512-R005FT4 LRMAT2512-R04FT4
LRMAM2512-R0005FT4 LRMAT2512-R0015FT4 LRMAP2512-R03FT4 LRMAP2512-R008FT4 LRMAM0805-
R025FT5 LRMAN0815-R02FT4 LRMAT2512-R005JT4 LRMAM1206-R015FT5 LRMAP2512-R015FT4 LRMAP2512-
R003FT4 LRMAM1206-R012FT5 LRMAT2512-R008FT4 LRMAT2512-R01FT4 LRMAT2512-R002FT4 LRMAT2512-
R004FT4 LRMAT2512-R025FT4 LRMAP2512-R075FT4 LRMAT2512-R007FT4 LRMAT2512-R012FT4 LRMAT2512-
R05FT4 LRMAN0815-R01FT4 LRMAP2512-R08FT4 LRMAN0815-R015FT4 LRMAT2512-R003FT4 LRMAM1206-
R025FT5 LRMAP2512-R06FT4 LRMAP2512-R04FT4 LRMAT2512-R033FT4 LRMAM2512-R03FT4 LRMAT2010-
R015FT4 LRMAM2512-R04FT4 LRMAM2512-R005FT4 LRMAM2512-R05FT4 LRMAP2512-R02FT4 LRMAM2512-
R01FT4 LRMAP2512-R05FT4 LRMAP2512-R01FT4 LRMAM2512-R02FT4 LRMAM2512-R001FT4 LRMAP2512-
R10FT4 LRMAP2512-R005FT4 LRMAP2512-R002FT4 LRMAM1206-R007FT5 LRMAM1206-R004FT5 LRMAP2512-
R300FT4 LRMAP2512-R0005FT4 LRMAP2512-R150FT4 LRMAP2512-R030FT4 LRMAP2512-R060FT4
LRMAT2512-R003JT4 LRMAP2512-R003JT4 LRMAM2512-R0005JT4 LRMAM2512-R03JT4 LRMAM0805-R02JT5
LRMAT2010-R015JT4 LRMAM1206-R006JT5 LRMAT2512-R018JT4 LRMAT2512-R006FT4 LRMAT2512-R011JT4
LRMAM1206-R009JT5 LRMAT2512-R001JT4 LRMAM1206-R014JT5 LRMAP2512-R011FT4 LRMAN0815-R005FT4
LRMAP2512-R015JT4 LRMAT2010-R10FT4 LRMAM1206-R014FT5 LRMAP2512-R07JT4 LRMAT2512-R006JT4
LRMAP2512-R03JT4
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