SPD73-103M

DC Resistance (DCR):	67 mOhm Max
Height - Seated (Max):	0.154" (3.90mm)
Size / Dimension:	0.287" L x 0.287" W (7.30mm x 7.30mm)
Supplier Device Package:	--
Package / Case:	Nonstandard
Mounting Type:	Surface Mount
Inductance Frequency - Test:	100kHz
Operating Temperature:	-55°C ~ 125°C
Ratings:	--
Frequency - Self Resonant:	--
Q @ Freq:	--
Series:	SPD73
Shielding:	Shielded
Current - Saturation:	1.86A
Current Rating:	1.86A
Tolerance:	±20%
Inductance:	10µH
Material - Core:	Ferrite
Type:	Wirewound
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Fixed Inductors are the building blocks of a wide range of circuits, from computers to medical devices and aerospace applications. The correct selection of a fixed inductor with the proper application field and working principle is essential for the success of any electronics project. The SPD73-103M is a specific type of fixed inductor whose performance characteristics and application field and working principle must be studied in order to determine its suitability for a particular application.

The SPD73-103M

The SPD73-103M is a 1.2mH fixed inductor with a maximum DC current rating of 250mA. It has an inductance tolerance of +10%/-30%, meaning that the maximum inductance may vary by as much as +33% or -10% from the nominal value. The SPD73-103M has a permeability of 22μH-1 and a maximum saturation of 1.888A. The inductor also has a temperature range of -40°C to +125°C, and it is RoHS-compliant.

Application Field and Working Principle

The SPD73-103M is primarily used in power filter circuits and switch mode power supplies. The primary role of an inductor in these applications is to reduce electrical noise by limiting the rate of sudden changes in the current. This is achieved by forcing changes in the current through the inductor to be gradual, since the inductor\'s magnetic field opposes such rapid changes.In a power filter circuit, the SPD73-103M is used to filter out unwanted noise from signals such as audio and video. The SPD73-103M acts as a low-pass filter that is designed to reduce signals above certain frequencies while allowing signals below those frequencies to pass unhindered. This type of filter is most commonly found in power supplies where it smoothes out voltage fluctuations. This allows the power supply to provide a more stable source of power to its circuit.In a switch mode power supply, the SPD73-103M functions as a smoothing inductor. It is used to store energy from the switching action of the power supply and to release it during certain cycles. In this way, the SPD73-103M helps to provide a more steady output voltage from the power supply.

Conclusion

The SPD73-103M is a 1.2mH fixed inductor with a maximum DC current rating of 250mA, an inductance tolerance of +10%/-30%, a permeability of 22μH-1, and a maximum saturation of 1.888A. Its primary application field is within power filter circuits and switch mode power supplies, where it is used to reduce electrical noise and provide a more stable source of power. Careful consideration must be taken in selecting the proper inductor for the application, as the wrong inductor can have detrimental effects on the circuit.

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