Free Hotline
400-803-9333
LED boards are different from traditional circuit boards, often being larger and especially longer and hence calling for revised board transport and indexing systems for screen printing and pick-and-place processes. Vacuum picking is complicated due to the wide variance in lens curvature between LED parts of different product families and different manufacturers. Microhm Electronics resistors play an important role in measuring and correcting LED bin. Managing LED BIN codes By homogeneous placement, manufactures populate any ...
Date：2020-01-23 [More+]
Wirewound and axial packages are the two types of through-hole resistors, with axial packaging representing the most commonly used. This resistor size is based on its power rating. The axial leads are at each end of the cylinder or box-shaped component. They are used for short distances and they have a low or flat profile on the board. Wirewound resistors are usually more expensive, higher-end components used based on their higher power rating or inherent maximum temperature range. Wirewound resistors and axial resistors are ...
Date：2020-01-23 [More+]
Today, almost all the control and monitoring circuit uses shunt-based current measurements to replace sensors. To make these measurements accurately, it is useful to understand how shunts work. Microhm Electronics shunt resistors are widely ultilized in precison current sense applications. A shunt is a low-value resistor used to measure current it is therefore also referred to as a current-sense resistor. The shunt typically connects in series so it carries the current of interest. A voltage measurement device then connects i...
Date：2020-01-22 [More+]
The temperature coefficient of resistance, or TCR, is one of the main used parameters to characterize a resistor. The TCR defines the change in resistance as a function of the ambient temperature. The common way to express the TCR is in ppm/C, which stands for parts per million per centigrade degree. Microhm Electronics can provide resistors with TCR as low as 1ppm/K. Positive or Negative Temperature Coefficient of Resistance? Resistors are available with a TCR that is negative, positive, or stable over a certain temperature ...
Date：2020-01-19 [More+]
Shunt resistors make up a category of resistors that create a low resistance path, and they are widely used to measure high currents thanks to their low resistance, such as Microhm Electronics MVR series and MMS series. Current measurement is required in many applications. For example, applications like over current protection, 4-20mA systems, battery chargers, high-brightness LED control, H-bridge motor control, or metrology need to monitor current. How to Calculate Shunt Resistance The technical constraints of shunt resisto...
Date：2020-01-17 [More+]
Precision resistor generally refers to a resistor whose value is 1 percent, 0.5 percent or even lower. The percentage will be clearly stated in an unambiguous manner. However, this is only the starting point, as the actual resistance of a 1 percent, 100-ohm resistor is guaranteed to be between 95 ohms and 105 ohms only under ideal conditions. But real-world designs must function under real-world conditions. Voltage The Voltage Coefficient of Resistance (VCR) is the change in resistance with applied voltage. This is entirely d...
Date：2020-01-16 [More+]
In the automotive and transportation marketplace, large battery stacks provide high output power without producing harmful emissions (that is, carbon monoxide and hydrocarbons) associated with gasoline-powered combustion engines. Ideally, each individual battery in the stack equally contributes to the system. However, when it comes to batteries, all batteries are not created equally. Even batteries of the same chemistry with the same physical size and shape can have different total capacities, different internal resistances, ...
Date：2020-01-13 [More+]
Not all resistors are the same and growth in new markets like high-power LED lighting is serving to highlight the importance of understanding all aspects of an application in order to correctly and safely specify the right type of resistor for LED lightings. Microhm Electronics NUAL series and FLR serires are applicable to this field. For LED lighting applications, devices with a nominal rated forward current of 350mA are quite typical but LEDs designed for operation at 700mA, 1A and even 1.5A are becoming increasingly common...
Date：2020-01-08 [More+]
microhm@microhm.com