This Product Selection Guide contains information to help select products in the RF Filters category on DigiKey.com
Radio frequency filter products provide a frequency-dependent level of signal attenuation, and are distinguished from similar products by their intended use in radio-related applications. They are commonly used to limit the amount of interference caused by strong signals outside a frequency range of interest. Component-level products designed to be incorporated into an electronic assembly as well as modular, connectorized products for lab & test equipment use are both included.
SelectionCharacteristics
Frequency: Either indicates the midpoint of a filter’s pass-band; the range of frequencies that is minimally attenuated by the filter, or the cutoff frequency. In a low pass filter everything above the cutoff frequency is blocked, while in a high pass filter everything below the cutoff frequency is blocked.
Bandwidth: Refers to the span of frequencies covered by the band. For example, a device with a frequency of 10MHz and a bandwidth of 2MHz, typically signifies the band of frequencies between 9MHz and 11MHz. Carefully consult the datasheets to ensure the device you choose covers the correct band of frequencies for your application.
Filter Type: Indicates the type of filter by its function.
Ripple: Characterizes the amount by which a filter’s transfer function varies within its pass band.
Insertion Loss: A measure of power losses incurred by signals passing through a device, under manufacturer-defined test conditions.
Mounting Type: Indicates how the device is attached.
Package/Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the supplier’s device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.
Size/Dimension: The physical dimensions of the device. Typically length X width or diameter X length.
Height (Max): Indicates how far the device will extend above the surface to which it has been attached.
ProductExamples
| MFR PART # | BPF.24.01 |
|---|---|
| DIGIKEY PART # | 931-1467-ND |
| MANUFACTURER | Taoglas Limited |
| DESCRIPTION | RF FILTER BANDPASS 2.4GHZ INLINE |
| DATASHEET | Click Here |
| MFR PART # | RLP-30+ |
|---|---|
| DIGIKEY PART # | 3157-RLP-30+TR-ND - Tape & Reel (TR) |
| MANUFACTURER | Mini-Circuits |
| DESCRIPTION | RF FILTER LOW PASS 37MHZ 4SMD |
| DATASHEET | Click Here |
| MFR PART # | SCLF-95+ |
|---|---|
| DIGIKEY PART # | 3157-SCLF-95+TR-ND - Tape & Reel (TR) |
| MANUFACTURER | Mini-Circuits |
| DESCRIPTION | RF FILTER LOW PASS 108MHZ 1206 |
| DATASHEET | Click Here |
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