21J200

Series:	20
Packaging:	Bulk
Part Status:	Active
Resistance:	200 Ohms
Tolerance:	±5%
Power (Watts):	1W
Composition:	Wirewound
Features:	Flame Retardant Coating, Safety
Temperature Coefficient:	±30ppm/°C
Operating Temperature:	--
Package / Case:	Axial
Supplier Device Package:	Axial
Size / Dimension:	0.157" Dia x 0.421" L (4.00mm x 10.70mm)
Height - Seated (Max):	--
Number of Terminations:	2
Failure Rate:	--

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Through Hole Resistors, 21J200 Application Field and Working Principle

Through hole resistors, also known as axial lead resistors, have two electrical connections that pass through the resistor body. This structure allows more input power to be absorbed and dissipated than its surface mounted counterparts, SMT resistors, making them ideal for higher wattage applications. The 21J200 is a through hole metal film resistor from the 21J2 series of resistors manufactured by Welwyn Components. This resistor is designed for general-purpose applications in industries such as telecommunications, computing, energy and medical.

Construction and Working Principle

The 21J200 resistor is constructed from a cylindrical ceramic substrate which is then finished with a coating of metal film. The typical working principle of the 21J200 is that a voltage is applied to the resistor, resulting in an increased current. As the current passes through the resistor, it encounters resistance, resulting in a decrease in the current and a proportionate voltage drop. This change in voltage is what gives the resistor its electrical resistance.

Range of Resistance

The 21J200 is a general-purpose resistor with a resistance range of 0.1 to 2MΩ, a power rating of 200mW and a tolerance of ±5%. It is available in seven different package sizes, making it suitable to a wide range of applications. It is designed to operate within a temperature range of -55°C to +155°C and has an insulation resistance of greater than 109 MΩ (min).

Applications of the 21J200

The 21J200 is designed to be used in a variety of applications, including:

• Telecommunications – Used to limit electromagnetic radiation, act as noise filters, and protect against voltage transients.
• Computing – Used to limit current draw from microprocessors, and regulate power supply in disc drives.
• Energy – Used to regulate power supplies in high-power LEDs.
• Medical – Used to control current to medical devices such as pacemakers.

Advantages of Through Hole Resistors

Through hole resistors offer numerous advantages over their surface mounted counterparts. These advantages include:

• Higher wattage – Through hole resistors are capable of handling higher wattage than SMT resistors, making them ideal for applications with high current or voltage.
• Ease of installation and maintenance – Through hole resistors are easier to install and maintain than SMT resistors as they don’t require an expensive reflow soldering process.
• Reliability – Through hole resistors have a longer life span than SMT resistors due to their robust construction.

Conclusion

The 21J200 through hole metal film resistor from Welwyn Components is designed for general-purpose applications in industries such as telecommunications, computing, energy and medical. This resistor is constructed from a cylindrical ceramic substrate and has a resistance range of 0.1 to 2MΩ, a power rating of 200mW and a tolerance of ±5%. It is available in seven different package sizes, making it suitable to a wide range of applications and its high wattage capabilities makes it ideal for applications with high current or voltage. In addition, it is relatively easy to install and maintain and has a long life span, making it a popular choice for many commercial applications.

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