Guide To The ALMJ25 Series: 2–3 W Current Sense Resistor
ALMJ25 Series Automotive Current Sensing Resistors Product Description
Our current sensing resistors leverage a proprietary fabrication process that yields ultra‑low resistance values—down into the single‑milliohm range—without sacrificing mechanical robustness. Because the element is fashioned from a densely packed metallic alloy and precision‑laminated onto a ceramic substrate, parasitic inductance is virtually eliminated, ensuring crisp, noise‑free current measurements even at high switching frequencies. The carefully selected alloy composition also minimizes thermal electromotive forces, preserving accuracy across wide temperature gradients. And for applications where automotive‑grade reliability is essential, we offer an AEC‑Q200 qualified variant that completes rigorous stress tests—from thermal cycling to mechanical shock—to meet the toughest industry standards. Whether you’re designing battery‑management systems, power‑conversion modules, or precision diagnostic circuitry, these resistors deliver the low‑resistance, low‑noise performance and proven endurance your system demands.
| Parameter | Standard |
|---|---|
| Power Rating | 1~100mΩ : 2~3W |
| Resistance Value | 1~100mΩ |
| Operating Temperature Range | -55 to +170°C |
| Component Temperature Coefficient (TCR) | ± 50 ppm/°C |
| Maximum Working Voltage (V) | (P x R)1/2 |
| Rating Current (A) | (P / R)1/2 |
P=Power Rating; R=Resistance vaIue
ALMJ25 Series Automotive Current Sensing Resistors Product Presentation
The ALMN25 series consists of two products, ALMN25J and ALMN25H. There are some minor differences between them, mainly in terms of rated power and resistance values. The following lists two tables to help you understand this series of products:
Standard Electrical Specifications:distinction
| 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 | Electrode | Operating Temperature(℃) |
|---|---|---|---|---|---|---|
| ALMN25J | 2W | 50 | 1-4 | CuMn | R001-R004:Wide | -55~+170°C |
| 2-10 | R002-R100:Narrow | |||||
| ALMN25H | 2W&3W | |||||
| 1-4 | R001-R004:Wide | |||||
| 2-100 | R002-R100:Narrow |
Product Characteristics
| Item | Test condition/ Methods | Limited | Standard |
|---|---|---|---|
| Resistance | Measuring resistance value at room temperature 25℃±5℃ | Refer to Spec | IEC60115-1 4.5 |
| 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 overload for 5 seconds and measure the resistance change rate after standing for 24 hours. 5 times the rated power for 5 seconds | ≤±0.5% | MIL-R-26E |
| Resistance to Soldering Heat | 260℃± 5℃ time ：12sec± 0.5sec | ≤±0.5% | MIL-STD-202 Method 210 |
| Solderability | Immerse in the furnace at 245 ± 5℃for 3 ± 1 seconds, then take it out and put it under a magnifying glass to observe the solder area | The electrode shall cover more than 95% of new tin. | MIL-STD-202 Method 210 |
| Temperature Cycling | -55℃ (30min)/+125℃(30min), 1000 cycles | ≤±0.5% | MIL-STD-202 Method107G |
| Low temperature Storage | -55℃ for 1000hours, No power | ≤±0.5% | MIL-STD-26E |
| High Temperature Storage | 125℃ for 1000hours, No power | ≤±1% | IEC6011501-4.25 |
| Bias Humidity | +85℃, 85% RH ，10%bias, 1000hours | ≤±0.5% | MIL-STD-202 Method103 |
| Mechanical shock | Condition C ,100 g’s ,6 msec, 3 mutually perpendicular axes, in 6 directions, three impacts each for a total of 18 times 18 shocks. | ≤±0.5% | MIL-STD-202 Method 213 |
| Vibration | The frequency varies from 10HZ to 55HZ and return to 10HZ, shall be transferred in 1 min. Amplitude : 1.5mm, 3 directions, and 12 hours | ≤±0.5% | MIL-STD-202 Method 201 |
| Operational life | 70℃± 2℃, 1000 hours, at rated power 1.5 hours “ON”, 0.5 hours “OFF” | ≤±1% | MIL-STD-202 Method 108 |
For more detailed information such as specifications, operating temperature range, etc., you can visit the homepage of the website. Our company offers a wide range of products in electronic components. Additionally, we provide free sample trials. If you need to apply for the trial of PROSEMI current detection resistors, overcurrent protection devices, or overvoltage protection devices in your equipment or project, please fill out the form below. We will promptly send the samples to you according to the product delivery time! Welcome to order PROSEMI samples!