catalg

Current Sensing Resistors, Metal Plate Type
Current Sensing Resistors,
Metal Plate Type
Type: ERJM1W
Features
● Low
resistance values and high precision (1 mΩ to 20 mΩ)
resistance not influenced by measurement position
● High heat emission
● Low profile, strong body
● Inductance less than 1.0 nH for the metal plate structure
● RoHS compliant
● Stable
■ As for Packaging Methods, Soldering Conditions and Safety Precautions,
Please see Data Files
Explanation of Part Numbers
1
2
3
4
5
6
7
8
9
10
11
12
E
R
J
M
1
W
S
F
3
M
0
U
Product Code
Thick Film
Chip Resistors
Size, Power Rating
Code Inch Power R.
M1W 2512
1W
Type
Code
S General type
T Wide terminal type
Packaging Methods
Packaging
Embossed Carrier Taping
U
4 mm pitch, 3,000 pcs.
Resistance Tolerance
Code
F
J
Tolerance
±1%
±5%
Code
Resistance Value
Shown by 3 digits or letters.
Decimal point is expressed by M as 3 mΩ=3M0, 10 mΩ=10M
Ratings
Part No. Power Rating
Standard
(inch size) at 70 °C (W) Resistance (mΩ)
ERJM1WS
(2512)
ERJM1WT
(2512)
1
Resistance
Tolerance (%)
3, 4
±350
5, 6, 10, 15, 20
±100
1, 1.5
Category
Temperature
Range (°C)
T.C.R.
-6
(×10 /°C)
F: ±1, J: ±5
You should use the
–55 to +170
350±100
2, 3, 4
Circuit board of use
aluminum substrate
when the added
wattage exceeds 0.5 W.
100±50
✽ Please contact the factory for other values and the range
120
100
Rated Load (%)
Power Derating Curve
For resistors operated in ambient temperatures above
70 °C, power rating shall be derated in accordance
with the figure on the right.
70 °C
80
60
40
20
0
–55 –40
170 °C
155 °C
0
40
80
120
160
200
Ambient Temperature (°C)
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
08
Oct. 2014
Current Sensing Resistors, Metal Plate Type
Construction
Dimensions in mm (not to scale)
T
a
W
L
Terminal; Plated Metal
Resistive Body; Alloy Plate
Protective coating; Resin
Type
Part No.
(inch size)
Dimensions (mm)
L
W
T
a
ERJM1WS
6.40±0.25
1.00±0.25
(2512)
3.20±0.25 0.80±0.30
ERJM1WT
T Type
6.40±0.40
2.10±0.30
(2512)
S Type
Mass (Weight)
[g/1000 pcs.]
70
90
Recommended Land Pattern
● An
example of a land pattern
a
b
Wiring pattern
(copper trace)
Land pattern
Solder resist
c
Part No.
ERJM1WS
ERJM1WT
a
2.1
3.1
Dimensions (mm)
b
3.4
3.4
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
08
c
4.2
2.2
Oct. 2014
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