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 (RoHS2)
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, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 18, 20, 22,
100, 120, 130, 140, 150, 180, 200, 220, 240, 250, 270, 280, 300
P (Power)
2512
1, 1.5, 2, 3, 3.5, 4, 5, 6, 7, 8, 10, 11, 12,
25, 27, 30, 33, 39, 40, 45, 47, 50, 57, 60, 68, 70, 75, 80, 85, 90,
15, 18, 20, 25, 30, 33, 35, 40, 50, 100
>R001 &
<R01:
±100,
1, 5
≤
R001: ±275
-55 to 170
>100
Black
±50
Resistance tolerance
TCR
(25 to 125°C)
Ambient temperature
Insulation resistance
Element alloy
Coating
1
%
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
W
W
mΩ
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
0805
M (Low thermal EMF)
1206
2512
ppm/°C
MΩ
Ambient temperature
Insulation resistance
Element alloy
Coating
Black
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
Green
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
Black
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 - For P version 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
05.17
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 - For P version 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
05.17
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 250°C to 255°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
05.17
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