SRF1280-221M

Series:	SRF1280
Packaging:	Tape & Reel (TR)
Part Status:	Active
Number of Coils:	2
Inductance - Connected In Parallel:	220µH
Inductance - Connected In Series:	880µH
Tolerance:	±20%
Current Rating - Parallel:	1.29A
Current Rating - Series:	645mA
Current Saturation - Parallel:	2.43A
Current Saturation - Series:	1.22A
DC Resistance (DCR) - Parallel:	343 mOhm Max
DC Resistance (DCR) - Series:	1.38 Ohm Max
Shielding:	Shielded
Ratings:	--
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	Nonstandard
Size / Dimension:	0.492" L x 0.492" W (12.50mm x 12.50mm)
Height:	0.315" (8.00mm)

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Arrays, Signal Transformers, SRF1280-221M Application Field and Working Principle

SRF1280-221M is a type of array signal transformer developed by ARRAY Signal Transformer (AST). It is a single-ended input/output transformer with an application field that spans a frequency range between 500 Hz to 300 MHz.This array signal transformer is constructed with three leads. It is available in various sizes and wattage levels. The transformer is also compliant with various power ratings ranging from 0.25 W to 200 W.The SRF1280-221M array is designed to be used for broad-band applications including frequency conversion, matching/impedance transformation, and pulse shaping. Its high linearity and excellent output/input isolation attributes make it the ideal choice for max frequency conversion.The high-frequency characteristic of this array is also a plus. It has a wide dynamic range, which allows it to be used for various frequency ranges. This includes both low (500 Hz) and high (300 MHz) frequencies.The CW input impedance of this transformer is approximately 50 Ohms. The DC winding resistance is approximately 0.19 Ohms and the inductance is 0.35 mH@1KHz. The primary leakage inductance is 0.3uH @50Ohms, and the secondary leakage inductance is 0.6uH @50Ohms.The working principle of the SRF1280-221M is fairly simple. Basically, it functions as an impedance matching transformer, which means that it changes the impedance of a signal interface to provide the desired voltage and current levels.In general terms, this array signal transformer has two sections - a primary and a secondary. The primary is supplied with a signal from the interface (which is usually at different impedance than the secondary) and the primary produces a corresponding signal at the secondary.Whereas the primary and secondary mostly operate in the same frequency range, the primary and secondary may work in different frequency ranges. This means that the primary works as voltage source and the secondary acts as a current source.One of the most noticeable features of the SRF1280-221M is its low power dissipation. This feature helps to ensure the transformer operates at low temperatures, thus enhancing its reliability. The transformer offers excellent stability for a wide range of power levels, ranging from 0.25 W to 200 W.Overall, the SRF1280-221M array signal transformer is a great device for a variety of applications. Its high linearity and wide frequency range make it suitable for a broad range of applications, such as frequency conversion, matching/impedance transformation, and pulse shaping. Moreover, its low power dissipation and excellent output/input isolation attributes make it a reliable and efficient signal transformer for maximum frequency conversion.

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