Low Resistance Metal Alloy Resistor
LRMA Series
Resistancerange0.5mΩto500mΩ
Hightemperatureoperaonto170°C
LowthermalEMFversion
Highpowerversion
Currentsensingforpowerelectronics
RoHScompliant&halogenfree
AEC-Q200qualied
0815
Low Resistance Metal Alloy Resistor
LRMA Series
•Resistance range 1 to 100mΩ
•High temperature operation to 170°C
•Low thermal EMF version
•High power version
•Current sensing for power electronics
•RoHS compliant & halogen free
Electrical Data
LRMA Version T (Standard) P (Power)
Size 2512
2010 2512
Power rating @70°CW≤R01: 2, >R01: 1 ≤R10: 3, >R10: 2
Overload rating (5s) W≤R01: 10, >R01: 5 ≤R10: 15, >R10: 10
Resistance range
mΩ1 to 100 0.5 to 500
Standard values
1
mΩ
1.5
7.5
5 to 100
5, 6, 10, 15,
20, 50, 100
Cu-Ni / Mn-CuCu-Ni
1, 1.5, 2, 3, 3.5, 4, 5, 6, 7, 8, 10, 11, 12,
15, 18, 20, 25, 30, 33, 35, 40, 50, 100
Resistance t
olerance
% 0.51, 1, 5
TCR (25 to 125°C) ppm/°C ≥R01: ±75 >R001 & <R01: ±100, R≤001: ±275
Ambient temperature °C -55 to 170
Insulation resistance
MΩ>100
Element alloy
LRMA Version M (Low thermal EMF) N (Inverse)
Size 12060805 251212250612
Power rating @70°CW 10.5
2.5
±100
1 to 25 0.5 to 60 3 to 30 2 to 401 to 3
1, 3
1 to 50
≥R001 & ≤R003
1
≥R002
≤R002
<R001
<R002
>R003
1
0.5, 0.75, 1, 1.5, 2, 3.5, 5,
10, 20, 25, 30, 40, 50, 60
3, 4, 5, 10,
15, 20, 25, 30
2,3,4,5,10,15,
20,25,30,40
1, 1.2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14,
15, 18, 20, 22, 25, 30, 39, 40, 50
≤R01: 2, >R01: 1 1
2
Overload rating (5s) W 5 ≤R01: 10, >R01: 5 5
3
15
Resistance range
mΩ
Standard values
1
mΩ
Resistance t
olerance
% 0.51, 1, 5
TCR (25 to 125°C) ppm/°C ≥
R01: ±75,
±100
Ambient temperature -55 to 170°C
Insulation resistance
MΩ>100
Element alloy Mn-Cu Mn-Cu / Cu-Ni
Notes: 1. Non-standard values and 0.5% tolerance may be available for high volume requirements.
Note 1 - This applies to LRMAT2512 and LRMAM2512. For LRMAP2512 this threshold is R004
2. Requires 300mm2copper pad & trace area
Physical Data (All dimensions in mm and nominal weight in mg)
Size L C t Wt
0805
0805
1206
1206
0612
0815
2010
2512
2512
2512
1225
>R001 &
<
R01: ±100≤R001: ±275
W
<R001: ±200 ≥R001: ±50
±50
0.5, 0.75, 1, 1.1, 1.5, 2, 2.5, 3, 4, 5, 6, 6.8, 7, 8, 9, 10, 11, 12, 13, 15, 18, 20,
22,25, 27, 30, 33, 39, 40, 45, 47, 50, 57, 60, 68, 70, 75, 80, 85, 90,100,
120, 130, 140, 150, 180, 200, 220, 240, 250, 270, 280, 300, 330, 390, 400, 500
2.0 ±0.1
3.2 ±0.2
1.7±0.2
2.1 ±0.25
5.0 ±0.2
6.4 ±0.2
1.25 ±0.1
1.6 ±0.2
3.2±0.2
3.75 ±0.3
2.5 ±0.2
0.4 ±0.2
0.6 ±0.2
0.5 ±0.3
0.4±0.2
0.5 ±0.2
0.6 ±0.3
2.6 ±0.2
2.0 ±0.2
0.9 ±0.2
3.2 ±0.2
0.6 ±0.2
0.6 ±0.2
1.1 ±0.3 0.75 ±0.2
0.6 ±0.2
0.7 ±0.2
0.6 ±0.2
0.65 ±0.25
5.5
18.3
12.9
14.1
35.6
57 to 63
3.2 ±0.3 0.5 ±0.2
6.4 ±0.3 0.9 ±0.2 70
1, 2, 3, 5, 6, 8,
9,10, 20, 25
05.20
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Resistors
Low Resistance Metal Alloy Resistor
LRMA Series
Temperature Derating
0%
20%
40%
60%
80%
100%
-30 20 70 120170
Ambient Temperature (°C)
Proportion of Pr
Typical Temperature Rise
0
20
40
60
80
100
120
0% 20% 40% 60%80% 100%
Proportion of Pr
Temperature Rise (°C)
Joint
Hot spot
Construction
Marking
The components are marked with ohmic value, e.g. “R002” = 2mΩ, “R010” = 10 mΩ.
Solvent Resistance
The
Due to space restrictions, for LRMAM1206-R001, "01" = 1mΩ is used, and for LRMAM0805,
“2” = 2mΩ, “010” = 10 mΩ are used.
component is resistant to all normal industrial cleaning solvents suitable for printed circuits.
Performance Data
Maximum (%) Typical (%)
Load at rated power (cyclic load, 1000hours at 70°C) ±∆R0805: 1.5 Others 1
0805: 1 Others 0.5
0805: 1 Others 0.5
0805: 1.5 Others 0.5
0805: 1 Others 0.5
0.3
Short term overload (5x rated power for 5s) ±∆R 0.50.15
Humidity (1000hours, 85°C, 85%RH) ±∆R 0.15
Temperature cycle (-40 to +125°C, 1000 cycles, 15minute dwell) ±∆R 0.15
Resistance to solder heat (260°C ±5°C for 20s ±1s) ±∆R 0.50.3
Solderability (245°C ±5°C for 2s ±0.5s) >95% coverage
Dry heat (1000hours at 170°C) ±∆R 0.3
Low temperature storage (1000hours at -55°C) ±∆R 0.50.15
Substrate bending (board 1.6mm, fulcrum spacing 90mm, deflection 2mm) ±∆R 0.3
Insulation resistance (1 minute @ 100Vdc) >100M
Thermal Performance & Mounting
Copper electrode with
nickel then tin plating
Coating (UL94-V0)
Low TCR
resistance alloy plate
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.
SenseCurrent
L b
a
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.
Reference Pad Dimensions (mm)
Size a b L
1206
1.8
1.8
1.7
2.3
1.6
1.0
1.4
3.8 0.7 0.7
1.21.15
3.4 3.51.5
0815
2010
0805
0612
7.9 1.50.9
2512≤R003
1
<R002
1206≥R002
4.0 3.1 1.3
2512>R003
14.0 2.1 4.1
1225
7.0 1.0 2.3
Note 1 - This applies to LRMAT2512 and LRMAM2512. For LRMAP2512 this threshold is R004
05.20
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Low Resistance Metal Alloy Resistor
LRMA Series
Resistors
–
Low Resistance Metal Alloy Resistor
LRMA Series
Paper Tape
Bottom Tape
Packaging
Size Tape A B W F E P1P2P0ΦD0tΦAΦBΦC Wr Tr
0612,
1206
0805
2010
Paper
Paper
2
1.6
±0.15
2.8
±0.2
5.3
±0.2
12
±0.05
5.5
±0.05
1.75
±0.1
4.0
±0.1
2.0
±0.05
4.0
±0.05
0.85
±0.15
2.4
±0.2
8.0
±0.2
3.5
±0.05
1.75
±0.1
4.0
±0.1
2.0
±0.1
4.0
±0.1
0.84
±0.1
11.4
±1
.0
±0.15
3.6
±0.2
8.0
±0.2
3.5
±0.05
1.75
±0.1
4.0
±0.1
2.0
±0.05
4.0
±0.1
1.5
+0.1/-0
1.5
+0.1/-0
1.5
+0.1/-0
0.84
±0.1
178± 2
178± 2
178± 2
178± 2
178± 2
60 ±1 13 ±1 9±1
60 ±1 13 ±1 9±1
11.5
±1
0815Emboss
Emboss
2.6
±0.2
4.5
±0.2
12
±0.2
5.5
±0.1
1.75
±0.1
4.0
+-0.1
2.0
±0.2
4.0
±0.1
1.55
±0.05
1.1
±0.1 60 ±1
60 ±1
13 ±1
13 ±1
13 ±1
13 ±1
15.4
±2
15.4
±2
2512
1225 Emboss 3.6
±0.2
6.9
±0.2
12
±0.2
5.5
±0.05
1.75
±0.1
4.0
±0.1
2.0
±0.05
4.0
±0.05
1.5
+0.1/-0
0.85
±0.15 60 ±1 13 ±1 13 ±1 15.4
±2
Storage
Conditions: 5°C to 35°C and40% to 75%RH
Shelf life: 2 years from manufacture
Processing
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
Example: LRMA low thermal EMF version in 2512 size and at 10 milliohms and 1% tolerance packed in tape.
L R M A M 2 5 1 2 1R 0 1 F T 4
Type
Version
T P M N
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1%
J 5%
Packing
T5 0612, 0805, 12065000/reel
T4 Tape 0815
Note 1: For values which require 6 characters, e.g. R00075, the hyphen is omitted.
2010,,25124000/reel Standard
ΦCΦBΦA
Tr
Wr
05.20
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Ordering Procedure
Example: LRMAM2512-R01FT4 (LRMA2512, low thermal EMF, 10 milliohms ±1%, Pb-free)
R
M
A
2
5
1
2
-1
R
0
F
T
4
1
3
4
5
6
1
2
3
4
5
6
Type Version Size Value Tolerance Packing
LRMA
T
Standard
0612
3 to 6
characters
Tape & reel
P
Power
0805
T5
0612, 0805, 1206
5000/reel
M
Low thermal EMF
1206
R = ohms
T4
0815, 2010, 2512, 1225
4000/reel
N
Inverse
0815
2010
2512
1225
Note 1: For values which require all 6 characters, e.g. R00075, the hyphen is omi�ed.
J= ±5%
F = ±1%
D = ±0.5%
Low Resistance Metal Alloy Resistor
LRMA Series
Resistors