ALMA2725 Current Sensing Resistors

Application

  • Entertainment product .
  •  Power supply
  • Measuring instrument
  •  Industrial product
  • Battery management system

Features

  • Low Resistance / Low TCR
  •  Excellent long term stability
  • RoHs compliant and halogen free.
  • Lead free.
  • AEC-Q200 qualified available

Part Numbering System

ALMA2725

Type Rating Power at 70°C T.C.R. (ppm/°C) Resistance Range (mΩ) 1.0%(F) 2.0%(G) 5.0%(J) Material Operating Temperature (°C)
ALMA2725 4W ±100 0.2 FeCrAl, MnCuSn, MnCu -55°C~170°C
±50 0.25~3

construction

ALMA2725                                 

 Unit: mm

Type Resistance (mΩ) H T1  T2
ALMA2725 0.2 6.9 ±0.254 6.35 ±0.254 1.10 ±0.254 1.2 ±0.254 2.15 ±0.254
0.25 0.95 ±0.254 2.287 ±0.254
0.3 1.975 ±0.254
0.35 1.71 ±0.254
0.4 1.44 ±0.254
0.5 0.85 ±0.254 2.08 ±0.254
0.6 1.78 ±0.254
0.8 1.30 ±0.254
1.0 6.8 ±0.254 0.65 ±0.254 1.15 ±0.254 1.8 ±0.254
1.5~1.6 1.5 ±0.254
2.0~3.0 0.55 ±0.254  

 

Recommended land pattern

ALMA2725

                                                              Unit: mm

Type Resistance (mΩ) a b i
ALMA2725 0.2~0.35 2.9 6.7 1.28
0.4~0.8 3.25 6.85 1.7
1~3 2.75 6.85 2.7

 

Power Derating Curve

For resistors operated in ambient temperatures 70°C, power ratingshall bederated inaccording with the curve below:

ALMA2725

 

Wave solder Temperature condition

ALMA2725

 

Solder Reflow Temperature Condition

ALMA2725

  • Soldering Iron: temperature 350℃±10℃  , dwell timeshall be less than 3 sec.

 

Product Characteristics

Item Test Condition/Methods Limited
Temperature Coefficient of Resistance At 25℃ / +150℃, 25℃ is the reference temperature. Refer to Spec
Short Time Overload 4 X rated power for 5s ±0.5%
Resistance to Soldering Heat 260℃ ± 5℃ for 10 sec ±0.5%
Temperature Cycling 1000 Cycles (-55°C to +155°C). Measurement at 24 ±4 hours after test conclusion. 30 min maximum dwell time at each temperature extreme. ±0.5%
High Temperature Storage 1000 hours at 170℃, No power ±1%
Bias Humidity 1,000 hours; 85°C / 85% RH, 10% of operating power. Measurement at 24 ±4 hours after test conclusion. ±0.5%
Load Life (Endurance) 70 ±2℃, RCWV or Max. working voltage whichever is less for 1000 hrs with 1.5 hrs "ON" and 0.5 hrs "OFF". ±1%
Solderability 245℃ ±5℃ for 3s 95% Coverage Minimum
Dielectric Withstanding Voltage Applied 500VAC for 1 minute. No short or burned appearance.
Core Body Strength Central part pressurizing force: 5N, 10 seconds No broken
Terminal Strength (SMD) Pressurizing force 17.7N for 60 seconds No broken
Bending Strength Bending once 2mm for 10 seconds ±0.5%
Moisture Resistance T = 24 hours / Cycle, 10 Cycles. Steps 7a & 7b not required. Unpowered. ±0.5%

*Note: This test is a destructive experiment. The top protective layer is prone to damage and peculiar smell during, in the 50mR~100mR resistance test. The resistance change rate can meets the specifications.

 

Tapping & Package

ALMA2725

                                                                                                                                                                              Unit: mm

Type Resistance (mΩ) W ±0.3 P +0.1 E ±0.1 F ±0.1 D ±0.1 D1 ±0.1 G ±0.1 H ±0.1 A ±0.1 B ±0.1 T1 ±0.1 T ±0.05
2725 0.2~0.8 12.0 8.0 1.75 5.5 1.5+0.1/-0 1.55 4.0 2.0 6.81 7.16 1.3 0.25
1~3 1.05

 

Reel Specification

ALMA2725

                                                                                                                     Unit: mm

Reel Type / Tape W
7” reel for 12 mm embossed 2.5 ±0.5 13.5 ±0.5 17.7 ±0.5 60 ±0.5 16.2 ±0.5 178 ±1
7” reel for 24 mm embossed 2.0 ±0.5 13.2 ±0.5 24.4 ±2.0

 

Packing

Type Quantity (pcs)
2725 (R ≥ 1) 2000
2725 (0.8 ≥ R ≥ 0.2) 1000

 

Storage Temperature

  •  Storage time at the environment temp: 25±5℃& humidity: 60±20% is valid for one year from the date of delivery

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