LMJ25 Current Sense Resistor
Products Specifications
- Package
- 2512 (6432 Metric)
- Features
- Current Sense, Industrial Grade, Large Electrode, Extremely Low Resistance Values, Very Low Inductance, Low Thermal EMF
- Series
- LMJ25
- Operating Temperature
- -55℃ ~ +170℃
- Temperature Coefficient
- ±350ppm/℃
- Resistance
- 0.5 mOhms
- Power Rating
- 2W
- Tolerance
- 1%
- Mounting
- SMD / SMT
- Style
- Surface Mount Current Sensing Reistors
- Termination
- 2-Terminal
- Composition
- Metal Alloy
Description
- Proprietary processing technique produces extremely low resistance values
- Very low inductance
- Low thermal EMF
- Metallic Material
Part Numbering System
| Parameter | Standard |
|---|---|
| Power Rating | 2&3W |
| Resistance Value | 0.5mQ |
| Operating Temperature Range | -55 to +170℃ |
| Component Temperature Coefficient(TCR) | ±350 ppm/℃ |
| Maximum Working Voltage(V) | (PxR)1/2 |
Standard Electrical Specifications
| Type | Rating Power at 70℃ |
T.C.R. (ppm/℃) |
Resistance Range(mQ) D:0.5%;F:1.0% G:2.0%;J:5.0% |
Meterial | Electrode | Operating Temperature(℃) |
|---|---|---|---|---|---|---|
| LMJ25 | 2&3W | ±350 | 0.5 | CuMn3 | Wide | -55~+170℃ |
Resistance Values of the 2512 Series, 2W Resistors
| Standard Resistance Values ( Ω ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 0ohm | 0.0005ohm | 0.001ohm | 0.002ohm | 0.003ohm | 0.004ohm | 0.005ohm | 0.006ohm | 0.008ohm | 0.01ohm |
| R000 | R0005 | R001 | R002 | R003 | R004 | R005 | R006 | R008 | R010 |
| Manufacturable Resistance Values ( Ω ) | ||||||||
|---|---|---|---|---|---|---|---|---|
| 0.00075ohm | 0.0012ohm | 0.0015ohm | 0.0025ohm | 0.0035ohm | 0.0038ohm | 0.0045ohm | 0.007ohm | 0.009ohm |
| R00075 | R0012 | R0015 | R0025 | R0035 | R0038 | R0045 | R007 | R009 |
Construction
Unit: Millimeters
| Style | Resistance (mΩ) |
L | W | C | T | Material |
|---|---|---|---|---|---|---|
| LMJ25 | 0.5 | 6.4 ± 0.2 | 3.2 ± 0.2 | 2.1 ± 0.25 | 0.9 ± 0.20 | MnCu3 |
Recommended land pattern
Unit: Millimeters
|
Resistance
Range (mΩ )
|
a | b | L |
|---|---|---|---|
| 0.5 |
4.0±0.1
|
3.1±0.1
|
1.3±0.1
|
Power Derating Curve
For resistors operated in ambient temperatures 70℃, power rating shall be derated inaccording with the curve below:
IR Reflow-Soldering Profile
Wave - Soldering Profile
Recommended Solder Curve
 |
Reflow Condition | Pb-Free assembly | |
| Pre heat | - Temperature Min (Ts (min)) | 150℃ | |
| - Temperature Max (Ts (max)) | 200℃ | ||
| - Time (Min to Max) (ts) | 60-120 secs | ||
| Average ramp up rate (Liquidus Temp (TL) to peak) | 5℃ / second max | ||
| TS(max) to TL - Ramp-up Rate | 5℃ / second max | ||
| Reflow | - Temperature (TL)(Liquidus) | 217℃ | |
| - Temperature (tL) | 60 - 150 seconds | ||
| Peak Temperature (TP) | 260℃ | ||
| Time within 5℃ of actual peak Temperature (tp) | 20 - 40 seconds | ||
| Ramp-down Rate | 5℃ / second max | ||
| Time 25℃ to peak Temperature (TP) | 8 minutes Max | ||
| Wave Soldering | 260℃, 10 seconds max. | ||
| Hand Soldering | 350℃, 5 seconds max. | ||
Product Characteristics
| Item | Test condition / Methods | Limited | Standard | ||
|---|---|---|---|---|---|
| Temperature coefficient of resistance |
TCR=(R-R0)/R0(T2-T1)X 10⁶ R0: resistance of room temperature R: resistance of 125℃ T1: Room temperature T2: Temperature at 125℃ |
Refer to Spec | MIL-STD-202 Method 304 |
||
| Short time Overload |
Apply an overload for 5 seconds, then measure the resistance change rate after a 24 hours rest. ( the overload conditions are as shown in the table below.) |
≤±0.5% | JIS-C5201-1 4.13 | ||
| Type | Power (W) | # of rated power | |||
| 2512 | 3 | 5 times | |||
| Resistance to Soldering Heat |
260℃±5℃ time: 10sec± 1sec | ≤±0.5% | MIL-STD-202 Method 210 |
||
| Temperature Cycling | -55℃ (15min)/+150℃(15min), 1000 cycles | ≤±0.5% | JESD22 Method JA-104 |
||
| Low temperature Storage |
-55±2℃ for 96 hours, No power | ≤±0.5% | IEC 60115-1 4.23.4 | ||
| High Temperature Storage |
170℃ for 1000hours, No power | ≤±1% | MIL-STD-202 Method 108 |
||
| Bias Humidity | +85℃, 85%RH, 10%bias, 1000hours | ≤±0.5% | MIL-STD-202 Method103 |
||
| Solderability | 245±5℃, 3±1sec | At least 95% of surface area of electrode shall be covered with new solder | JSTD-002 | ||
| Load life | 70℃±2℃, 1000 hours, at rated power 1.5 hours “ON”, 0.5 hours “OFF” | ≤±1% | MIL-STD-202 Method 108 |
||
| Terminal Strength |
Bendability test Welded onto the bendabiligy test board and placed on the bending test machine, Apply downward force on the center of the test board to press it down by 2 mm. Under the load for 60 seconds, measure the rate of change in resistance. |
≤±0.5% | JIS-C5201-1 4.33 | ||
Tapping & Package
| Type | Pack | A ±0.2 |
B ±0.2 |
D0 +0.5 -0 |
E ±0.1 |
F ±0.05 |
P0 ±0.1 |
P1 ±0.1 |
P2 ±0.1 |
W ±0.2 |
D1 ±0.05 |
T ±0.15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2512 | Emboss | 3.60 | 6.90 | 1.50 | 1.75 | 5.50 | 4.00 | 4.00 | 2.00 | 12.00 | 1.50 | 1.20 |
Reel Specification
Unit: Millimeters
| Type | A | B | C | D | M | W |
|---|---|---|---|---|---|---|
| 2512 | 2.00±0.5 | 13.50±0.5 | 21.00±0.5 | 60.00±1.0 | 178.00±2.0 | 13.80±0.5 |
Packaging
Quantity: 4, 000pcs
8mm wide tape on 178mm(7 inch)
diameter reel -specification EIA Standard 481.
Peel Strength of Upper Belt
Stripping speed: 300 mm / min; The peel force is between 0.1N and 0.7n.
Storage Conditions & Shelf Life
It can be stored for 2 years under closed conditions with temperature of 5℃ ~ 35℃ and relative humidity of 40 ~ 75
Please avoid the following harsh environment during storage to avoid affecting the product performance and solder connectivity: the places with corrosive gases such as sea breeze, Cl2, H2S, NH3, SO2 and NO2 shall be stored without direct sunlight.
Precautions For Product Use
When measuring the resistance value before welding, a special resistance meter with high precision shall be used. When measuring, a 4-wire probe or fixture must be used. 4. When measuring parts with a wire measuring needle, the 4 measuring needles must indeed contact the parts.
Avoid damaging the protective layer during manual welding or clamping with tweezers.
When the PCB is divided or fixed on the support, be careful to avoid excessive bending causing mechanical stress to the resistor.
It shall be used within the rated power range within the specification, especially when the power exceeds the rated value, which may affect the reliability of the product