Ohmite 25J2R0E

Ohmite Part Number 25J2R0E（Through Hole Resistors）, developed and manufactured by Ohmite, distributed globally by Jinftry. We distribute various electronic components from world-renowned brands and provide one-stop services, making us a trusted global electronic component distributor.

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Through Hole Resistors is a classic electronic component, has been called plug-in resistance. It refers to those resistors that are soldered and fixed by metal pins through holes in the circuit board and are mainly used to limit current, regulate voltage and divide voltage circuits. Through hole resistance can be divided into precision type and ordinary type, precision through hole resistance has higher parameter requirements. Compared with surface mount resistors, through-hole resistors show different characteristics and advantages in assembly and maintenance.

Through Hole Resistors is a plug-in resistor with a through hole structure. Due to its high reliability, good heat dissipation performance, and easy maintenance, it is widely used in industrial control, communication equipment, automotive electronics, consumer electronics and other fields. Especially in the need to withstand higher power or harsh working environment, the advantages of through-hole resistance are more obvious. They are capable of long-term stable operation and maintain good performance even under extreme conditions such as high temperature, high humidity or vibration. The pin design of the through-hole resistor allows it to be easily fixed to the circuit board by welding, which is especially important for some circuit projects that require manual assembly or debugging. This flexible assembly method not only improves production efficiency, but also reduces maintenance costs.

• 1. What is a through-hole resistor?

  Through-hole resistor is a common name for plug-in resistors by some engineers, which means the resistor with a through hole in the middle.
  The through hole in the middle is easy to install by inserting a metal rod. The through-hole resistor has a metal film or carbon film on the outer layer and a through hole in the middle of the color ring resistor. This through-hole resistor refers to the plug-in resistor.

• 2. How to identify color ring resistors

  1. Four-color ring resistors
  Four-color ring resistors refer to resistors that use four color rings to indicate resistance, counting from left to right, as shown in the figure. The first color ring indicates the largest digit of the resistance; the second color ring indicates the second digit of the resistance; the third color ring indicates the number of times the resistance is multiplied; the fourth color ring indicates the allowable deviation (accuracy) of the resistance.
  For example, if the first ring of a resistor is red (representing 2), the second ring is purple (representing 7), the third ring is brown (representing 10 times), and the fourth ring is gold (representing ±5%), then the resistance of this resistor should be 270Ω, and the error range of the resistance is ±5%.
  2. Five-color ring resistor
  Five-color ring resistor refers to a resistor that uses five color rings to represent the resistance, counting from left to right, as shown in the figure. The first color ring represents the largest digit of the resistance; the second color ring represents the second digit of the resistance; the third color ring represents the third digit of the resistance; the fourth color ring represents the multiplier of the resistance; the fifth color ring represents the error range.
  For example, if a five-color ring resistor, the first ring is red (representing 2), the second ring is red (representing 2), the third ring is black (representing 0), the fourth ring is black (representing 1 times), and the fifth ring is brown (representing ±1%), then its resistance is 220Ω×1=220Ω, and the error range is ±1%.
  3. Six-color ring resistors
  Six-color ring resistors refer to resistors that use six color rings to represent resistance values. As shown in Figure 1, the first five color rings of the six-color ring resistor are the same as the five-color ring resistor, and the sixth color ring represents the temperature coefficient of the resistor.

• 3. What are the applications of through-hole resistors?

  ‌Voltage division‌: The required voltage is distributed through series resistors. It is often used for voltage sampling and current sampling. It is connected in series through precision resistors with small resistance. After voltage division, the voltage needs to be amplified by an amplifier.
  ‌Shunting‌: When the current in the loop is large and the power of one resistor is insufficient, the current is shunted through parallel resistors to play a protective role.
  ‌Current limiting‌: Limit the current passing through components to protect components, such as the current limiting resistor of LED light-emitting diodes.
  ‌Decoupling‌: In circuit operation, resistors are used to form a path to remove excess energy, which is used for inductive components.
  ‌Filtering‌: Together with capacitors, a filter circuit is formed. The cutoff frequency of the filter is calculated according to the resistance value and the capacitance value to achieve low-pass filtering or high-pass filtering.
  ‌Pull-up and pull-down‌: The pull-up resistor is connected to the positive end of the power supply, and the pull-down resistor is connected to the negative end of the power supply. It is used for signal output or input to prevent false operation caused by signal interference.
  ‌Dummy load‌: Connect a resistor in parallel with the output end of the power supply so that the output end does not form an empty load, which clamps the output voltage.
  ‌ Jumper function‌: Mainly the use of 0 ohm resistors, used for debugging and compatibility, convenient wiring, reserved resistor positions, convenient current testing, noise suppression, safety protection and other occasions.