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
| 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
Unit: mm
| Type | Resistance (mΩ) | L | W | 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
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:
Wave solder Temperature condition
Solder Reflow Temperature Condition
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
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
Unit: mm
| Reel Type / Tape | A | B | C | D | W | M |
|---|---|---|---|---|---|---|
| 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