LMR2728 Current Sense Resistor
Low Resistance Metal Strip Chip Resistor
Description
- Current Sensing
- Over current protection
- Servo motor control circuits
- Inverter power
- Electric control system
- Li-battery management system
- Low inductance ＜5nH (1MHz)
- Insulation resistance≥220MΩ（DC 500V 1min）
- RoHS compliant
Part Numbering System
| Type | Rating Power at 70℃ | T.C.R. (ppm/℃) | Resistance Range(mΩ) 0.5%（D） 1.0%（F） 2.0%（G） 5.0%（J） |
Meterial | Operating Temperature(℃) |
|---|---|---|---|---|---|
| LMR2725 | 4W | ±200 | 0.2~0.25 | FeCrAl Manganin Karma | -55。C~170°C |
| ±100 | 0.5 | ||||
| 1~2 | |||||
| ±75 | 3 | ||||
| LMR2728 | 5W | ±50 | 1~50 | ||
| 4W | ±50 |
construction
Unit: mm
| Type | Resistance （m Ω) | W | C | A | D |
|---|---|---|---|---|---|
| LMR2725 | 0.2~0.25 | 6.8±0.25 | 6.5±0.25 | 1.7±0.25 | 1.2±0.1 |
| 0.5 | 1.2±0.25 | ||||
| 1~2 | |||||
| 3 | 1.0±0.25 | ||||
| LMR2728 | 1 | 6.8 ±0.2 | 7.2±0.2 | 1.2±0.2 | 1.0±0.1 |
| 2~50 | 0.8±0.1 |
Recommended land pattern
Unit: mm
| Type | Resistance （m Ω) | L | a | c |
|---|---|---|---|---|
| LMR2725 | 0.2~0.25 | 1.32 | 3.18 | 6.86 |
| 0.5~3 | 3.12 | 2.28 | ||
| LMR2728 | 1 | 4.5 | 3.0 | 7.8 |
| 2~50 |
Power Derating Curve
For resistors operated in ambient temperatures 70°C, power ratingshall bederated inaccording with the curve below:
Solder Reflow Temperature Condition
Product Characteristics
| Item | Test condition/ Methods | Limited |
|---|---|---|
| Temperature coefficient of resistance | Test was conducted from 20℃ to 120℃ while 20℃ worked as the reference. |
Refer to Spec |
| Short time Overload | 5 X rated power for 5s | ±0.5% |
| Resistance to Soldering Heat | 260℃± 5℃ time： 10sec± 1sec | ±0.5% |
| Temperature Cycling | 1000Cycle (-55℃ to 155℃) | ±1% |
| High Temperature Storage | 1000hours at 170℃,No power | ±1% |
| Bias Humidity | 1000hrs 85℃/85%RH 。Note: Specified conditions:10% of operating power. |
±1% |
| Operational life | Condition D Steady State TA=125℃ at rated power | ±1% |
| Solderability | 245℃ , 3s. | 95% Coverage Minimum |
Tapping & Package
Unit: mm
| Type | A ±0.2 |
B ±0.2 |
W +0.3 |
F ±0.1 |
E ±0.1 |
P1 ±0.1 |
P2 ±0.1 |
P0 ±0.1 |
D0 ±0.1 |
t ±0.2 |
Quantity （pcs） |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2725 | 6.9 | 7.2 | 12.0 | 5.5 | 1.75 | 8.0 | 2.0 | 4.0 | 1.5 | 1.5 | 1,000 |
| 2728 | 7.7 | 7.1 | 16.0 | 7.5 | 1.75 | 12.0 | 2.0 | 4.0 | 1.5 | 1.3 |
Reel Specification
Unit: mm
| Type | A | N | W1 |
|---|---|---|---|
| 2725 | 178±2 | 60±1 | 12±1 |
| 2728 |