FAQ
You may know FIRSTOHM from here
we are simply making some questions that customers want to know. If you would like to know more in detail, please feel free to leave a message on the FIRSTOHM's website. Thank you!
Firstohm was established in 1969 and had 35 years of experience manufacturing cylindrical surface mount resistors (MELF Resistor). Today, Firstohm is a well-known brand for resistors worldwide and the preferred...
Read moreMELF Resistors have superior electronic and mechanical properties compared to chip resistors. MELF resistors have advantages such as resistance to vibration, thermal shock, better heat dissipation, and long-term...
Read moreMELF resistors are superior to chip resistors in both electronic and mechanical characteristics, so they are widely used in related fields such as industrial power supplies, smart meters, solar inverters,...
Read moreThe recommended solder reflow profile for Firstohm MELF resistor is as follows (compliant with J-STD-020 standard):
Read moreMany electronic circuits encounter high-pulse loads. Due to its unique cylindrical design, the resistance area of MELF resistors is larger than chip resistors so that they can withstand higher pulse energy.
Read moreAfter the resistor is mounted on the PCB, the way to dissipate heat is to use convection to remove the heat on the resistor's surface and to use solid-state heat conduction inside the resistor to transfer...
Read moreSulfur in the air – resistor killer Chip resistor contains silver(Ag) in its electrode structure. When there is a large amount of sulfur in the air, the silver tends to react with it and becomes silver...
Read moreMELF resistor has very low inductance (below 0.005uH). The experimental measurement data from ETC laboratory are as follows:
Read more