CMF5520M000FKR9

Through-hole resistors are one of the most common types of electronic components used in electronics. Commonly found in resistive devices like integrated circuit leadframes, heatsinks, and capacitors, through-hole resistors play an important role in the operation of all sorts of electronic equipment. That said, many people might be unaware of a through-hole resistor with the marking “CMF5520M000FKR9.”

The “CMF” in the resistor’s marking designation stands for “current measuring film.” It refers to a type of resistor that has a film layer made up of a highly conductive material, such as copper or gold, and a resistive inks layer that is laid on top of the film layer. When an electric current is applied to the film layer, it creates a voltage drop and, thus, a resistance. The value of the resistance is then determined by measuring the voltage drop across the inks layer. In the case of the CMF5520, it is a 20 ohm resistor.

As for its application field, the CMF5520M000FKR9 resistor is primarily utilized as a thermal protection device in integrated circuit packages. Upon contact with an excessively high temperature, the material used for the resistive inks layer will start to break down, resulting in an increase in resistivity. This allows the resistor to be employed as a thermal limit switch, protecting sensitive electronics from potential damage caused by temperature spikes. In addition, the CMF5520M000FKR9 can be used in conjunction with other resistors to detect changes in temperature for leadframe or heat sink control.

Now, when it comes to its working principle, the CMF5520M000FKR9 is incredibly simple. Basically, it works by exploiting the temperature-dependent resistance of the resistor. By regulating the temperature of the resistor, it can act as a switch. As mentioned above, this is due to the fact that the inks layer used in the CMF5520M000FKR9 has a temperature-dependent resistance. As the temperature increases, the resistance of the inks layer increases, thus increasing the total resistance. When the total resistance exceeds a given threshold, the CMF5520M000FKR9 will cut off the current.

In conclusion, the CMF5520M000FKR9 is an incredibly versatile resistor that is widely used in integrated circuit packages as a thermal limit switch. Through its working principle of temperature-dependent resistance, it is able to provide an effective protection for sensitive electronics.