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LR2512
Metal Alloy
Low Resistance

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FEATURES

- Ideal for all types of current sensing, voltage division and Pulse applications including
  switching and linear power Supplies, Instruments, power amplifiers.
- Proprietary processing technique produces extremely low Resistance values
- High-temperature performance (up to +170
)
- Metal Strip resistive material stable and ultra low TCR. Low and Stable TCR¡50ppm/

- Pure tin plating provides compatibility with lead (Pb) free and lead containing soldering processes.
- Compatible with Restriction of the use of Hazardous Substances (RoHS) directive 2002/95/EC (issue 2004).
- PFOS, PFOA, PAHs, Halogen free and REACH compliant.
- Excellent stability (|∆R/R|¡1.0% for 1,000 h at 70
) different environment conditions.
- High volume product suitable for commercial and special applications.
- Suitable for high precision current sensing circuit protection application.
- Miniature size suitable for compact Print Circuit Boards of high-precision electronic products.

APPLICATIONS

- Power Supply, Battery Pack, DIY Tools, Inverter/Converter(AC/DC, DC/DC, DC/AC)
- Measurable Instrument, Consumer Electrics, Note Book, PC Power Pack, LED Driver
- Others (example, automotive electronics).

GENERAL SPECIFICATIONS

Model

Power Rating
at 70

Max.
Rating
Current

Max.
Overload
Current

Operating Temp.
Range

TCR
[PPM/
]

Resistance Range[m]**

0.5%(D)

1.0%(F)
2.0%(G)
5.0%(J)

LR2512

1W

44.72A

100.00A

-55  to +170

0.5~3m=50
3.1~6.9=25
7~100m=15

7.0~100

0.5~100

1.5W

54.77A

122.48A

2W

63.25A

141.42A

0.5~3m=50
3.1~6.9=25
7~75m=15

7.0~75.0

0.5~75.0

3W

77.46A

134.16A

0.5~2.5m=50
2.6~10m=25

7.0~10.0

0.5~10.0

Remarks:
a. The Max. Power Rating is operated at 70
.
b. **Special tolerance and range of resistance are under requested.
c. Rating Current : I=P/R

CHARACTERISTICS

Short Time Overload

(R/R1) ¡0.5%

1W,1.5W,2W : 5times rated power, 5sec.
3W : 3times rated power, 5sec.

Insulation Resistance

109

DC10015V for 1minute

Dielectric Withstanding Voltage

Without break down

AC500V for 1minute, Max.50mA

Resistance to
Solder Heat

(R/R1) ¡0.5%

Solder temp./immersion time : 2605, 101sec.
and 35010, 3.50.5 sec.

Solderability test

95% coverage

Specimen prep. : 4hours 15 min. Steam
Aging : Solder Bath/Dip and Look Test, 2455
, 31sec.

Vibration

(R/R1) ¡0.5%

Frequency varied 55Hz in one minute,3 orientations,
Total duration 12hours

Resistance to solvent

(R/R1) ¡0.5%

Immersion time : 605sec, 20~25

Mechanical Shock

(R/R1) ¡0.5%

100 grams for 6 milliseconds, 5 pulses

Low Temperature Exposure(Storage)

(R/R1) ¡0.5%

1,000hours, -55

High Temperature
Exposure(Storage)

(R/R1) ¡1.0%

1,000hours, +170

Temperature Cycling
(Rapid Temp. Change)

(R/R1) ¡0.5%

Air to air, -55 to +150, 1,000cycles,
15minutes at each extreme, transition time 2 to 3 minutes

Moisture Resistance
(Climatic Sequence)

(R/R1) ¡0.5%

Mil-STD-202, Method 106
0% power, 7a and 7b not required, t=24 h/cycle, 10cycles, Unpowered

Bias Humidity

(R/R1) ¡0.5%

+85%,85% RH, 10% Bias, Extended Life
1000 hours, 1.5 hours On, 0.5 hours Off

Load Life

(R/R1) ¡1.0%

Rated continuous working voltage : 70
1000hours, 1.5hours ON, 0.5hours Off

DIMENSIONS

Model

DIMENSIONS - in inches (millimetres)

Maximum Power Rating[W]

Resistance Range[m]

L

W

H

T

LR2512

1.0 & 1.5

0.5~4.0

0.2460.010
(6.2480.254)

0.1300.010
(3.3020.254)

0.0310.010
(0.7870.254)

0.0740.010
(1.8800.254)

4.1~75.0

0.02540.010
(0.6450.254)

0.0440.010
(1.1180.254)

75.1~100.0

0.02540.010
(0.6450.254)

0.0340.010
(0.8680.254)

2.0

0.5~4.0

0.0310.010
(0.7870.254)

0.0740.010
(1.8800.254)

4.1~75.0

0.02540.010
(0.6450.254)

0.0440.010
(1.1180.254)

3.0

0.5

0.0310.010
(0.7870.254)

0.0740.010
(1.8800.254)

0.6~2.9&
4.1~10.0

0.0440.010
(1.1180.254)

3.0~4.0

0.0660.010
(1.6760.254)

SOLDER PAD DIMENSIONS

Maximum Power Rating[W]

SOLDER PAD Dimension - in inches (millimetres)

Resistance
Range [ m]

a

b

i

1.0 & 1.5

0.5~4.0

0.120(3.05)

0.145(3.68)

0.050(1.27)

4.1~100.0

0.083(2.11)

0.145(3.68)

0.125(3.18)

2.0

0.5~4.0

0.120(3.05)

0.145(3.68)

0.050(1.27)

4.1~75.0

0.083(2.11)

0.145(3.68)

0.125(3.18)

3.0

0.5~1.5

0.120(3.05)

0.145(3.68)

0.050(1.27)

1.6~10.0

0.083(2.11)

0.145(3.68)

0.125(3.18)

Remark : The total solder pad trace size are recommended as follows.
1.0W : 100
sq. mm / 1.5W : 200sq. mm / 2.0W : 300sq. mm / 3.0W : 400sq. mm

DERATING CURVE

MARKING

PACKAGING

Item

W

P1

E

F

Do

D1

P0

Po*10

P2

Ao

Bo

Ko

t

Spec.

12.00

8.00

1.75

5.50

1.55

1.50

4.00

40.00

2.00

3.90

6.74

1.08

0.24

Tole.

0.15

0.10

0.10

0.10

0.05

0.10

0.10

0.20

0.10

0.10

0.10

0.10

0.05

Reel Type / Tape

W

M

A

B

C

D

7 reel
for 12mm
embossed

16.20.5

1781.0

2.50.5

13.50.5

17.70.5

60.00.5

ORDERING PROCEDURE EXAMPLE

Copyright©, RARA Electronics Corporation
Tel:82-32-817-4325 Fax:82-32-817-4329

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