2

Technical Data ELX1179

Effective June 2022

MSMA

SMD current sensing resistor- metal strip

www.eaton.com/electronics

Mechanical parameters- Inches [mm]

Recommended PCB layout- mm

Family

Size code

L

W

C

T

Figure

MSMA0603

0603

[1608]

0.063 ± 0.004

[1.60 ± 0.10]

0.031 ± 0.004

[0.80 ± 0.10]

0.016 ± 0.008

[0.40 ± 0.20]

0.012 ± 0.008

[0.30 ± 0.20]

A

MSMA0805

R < 2

0805

[2512]

0.079 ± 0.008

[2.0 ± 0.20]

0.049 ± 0.008

[1.25 ± 0.20]

0.026 ± 0.012

[0.65 ± 0.30]

0.028 ± 0.008

[0.70 ± 0.20]

A

MSMA0805

R ≥ 2

0805

[2012]

0.079 ± 0.008

[2.0 ± 0.20]

0.049 ± 0.008

[1.25 ± 0.20]

0.016 ± 0.012

[0.40 ± 0.30]

0.028 ± 0.008

[0.70 ± 0.20]

A

MSMA1206

R = 1

1206

[3216]

0.126 ± 0.008

[3.20 ± 0.20]

0.063 ± 0.008

[1.60 ± 0.20]

0.043 ± 0.012

[1.10 ± 0.30]

0.030 ± 0.008

[0.75 ± 0.20]

A

MSMA1206

R > 1

1206

[3216]

0.126 ± 0.008

[3.20 ± 0.20]

0.063 ± 0.008

[1.60 ± 0.20]

0.020 ± 0.012

[0.50 ± 0.30]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2010

R ≤ 3

2010

[5025]

0.197 ± 0.008

[5.0 ± 0.20]

0.098 ± 0.008

[2.50 ± 0.20]

0.059 ± 0.012

[1.50 ± 0.30]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2010

R > 3

2010

[5025]

0.197 ± 0.008

[5.0 ± 0.20]

0.098 ± 0.008

[2.50 ± 0.20]

0.024 ± 0.012

[0.60 ± 0.30]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2512

R = 0.5

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.102 ± 0.008

[2.60 ± 0.20]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2512

0.5 < R ≤ 3

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.087 ± 0.008

[2.20 ± 0.20]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2512

3 < R ≤ 50

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

0.024 ± 0.008

[0.60 ± 0.20]

A

MSMA2512 3W

R ≤ 4

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.087 ± 0.008

[2.2 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

A

MSMA2512 3W

4 < R ≤ 100

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

A

MSMA2512

R > 100

2512

[6432]

0.252 ± 0.008

[6.40 ± 0.20]

0.126 ± 0.008

[3.20 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

0.035 ± 0.008

[0.90 ± 0.20]

A

MSMA1225

1225

[3264]

0.126 ± 0.008

[3.20 ± 0.20]

0.252 ± 0.008

[6.40 ± 0.20]

0.020 ± 0.008

[0.50 ± 0.20]

0.035 ± 0.010

[0.90 ± 0.25]

B

Figure A

Figure B

Construction

Metal Alloy Plate

Over-Coat

Matte Sn/Ni

Family

Resistance

(mΩ)

A

L

B

MSMA0603

R = 0

2.1

0.7

0.7

MSMA0805

1 ≤ R ≤ 2

1.4

0.7

1.15

2 ≤ R ≤ 25

1.4

1.2

1.15

MSMA1206

R = 1

1.8

1.0

2.3

1 ≤ R ≤ 50

1.8

1.6

1.7

MSMA2010

1 ≤ R ≤ 3

3.4

2.0

3.5

4 ≤ R ≤ 50

3.4

3.5

1.5

MSMA2512

0.5 ≤ R ≤ 3

4.0

1.3

3.1

3 W, R = 4

4.0

1.3

3.1

4 ≤ R

4.0

4.1

2.1

MSMA1225

1 ≤ R ≤ 40

7.0

2.3

1.0

1. The copper foil thickness of PCB needs 3 oz. minimum

2. PCB layout dimension tolerance is +/-0.1 mm.

3. The resistance will change slightly after soldered; it is dependent on PCB pad size deign

and it’s necessary to consider the effect of the resistance increase or decrease.

Part marking

Family

Marking

MSMA0603

No marking

MSMA0805

Resistance value is expressed by

3 digits.

005 = 0.005 Ω or 5 mΩ

010 = 0.010 Ω or 10 mΩ

White box = all values less than 2 mΩ

MSMA1206

Resistance value is expressed by

2 or 4 digits.

R01 = 0.001 Ω or 1 mΩ

7R5m = 0.0075 Ω or 7.5 mΩ

R050 = 0.050 Ω or 50 mΩ

MSMA2010

Resistance value is expressed by

4 digits.

R001 = 0.001 Ω or 1 mΩ

R050 = 0.050 Ω or 50 mΩ

MSMA2512

Resistance value is expressed by

4 digits.

R50m = 0.0005 Ω or 0.5 mΩ

R001 = 0.001 Ω or 1 mΩ

6R8m = 0.0068 Ω or 6.8 mΩ

R050 = 0.050 Ω or 50 mΩ

MSMA1225

Resistance value is expressed by

3 or 4 digits.

2R2m= .0022 Ω or 2.2 mΩ

005 = 0.005 Ω or 5 mΩ

010 = 0.010 Ω or 10 mΩ