PT4302 Superheterodyne Receiver Module Ceramic Bandpass Filter

As one of the most important component on typical PT4301 or PT4302 superheterodyne receiver module board, we must choose 10.7Mhz ceramic bandpass filter correctly, or else the receiver module will have worse performance or stop working.

Bandpass filter is an electronic device or circuit that allows signals between two specific frequencies to pass, but that discriminates against signals at other frequencies. Some bandpass filters require an external source of power and employ active components such as transistors and integrated circuits, these are known as active bandpass filters. Other bandpass filters use no external source of power and consist only of passive components such as capacitors and inductors, these are called passive bandpass filters.

Bandpass filters are used primarily in wireless transmitters and receivers. The main function of such a filter in a transmitter is to limit the bandwidth of the output signal to the minimum necessary to convey data at the desired speed and in the desired form. In a receiver, a bandpass filter allows signals within a selected range of frequencies to be heard or decoded, while preventing signals at unwanted frequencies from getting through. A bandpass filter also optimizes the sensitivity – wanted / unwanted signal rate of a receiver.

In both transmitting and receiving applications, well-designed bandpass filters, having the optimum bandwidth for the mode and speed of communication being used, maximize the number of signals that can be transferred in a system, while minimizing the interference or competition among signals.

Since bandpass filter is designed to work with receiver chip, so the parameter choice has to be same as defined by receiver chip, and for quality consideration, we only choose the top providers such as Murata and TDK, take the most common chosen Murata 10.7Mhz ceramic bandpass filter for example, the model number to work with PT4301 or PT4302 should be as follows.

PT4301 or PT4302 ceramic bandpass filter in bulk package from Murata

Official model number recommended is SFELA10M7HA00-B0 or SFE10.7MS3-A, so they surely will work just fine, however, there are some other models that work well too, or even better performance, since they are all 10.7Mhz center frequency and 180kHz bandwidth, the model number is as follows.

CERAFIL standard lead type – SFELA10M7HA00-B0 or SFE10.7MS3-A

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFELA10M7HA00-B0 10.700 ±30kHz within 180 ±40kHz 520 max. 7.0 max. 40 min.

CERAFIL low loss type – SFELA10M7HAA0-B0 or SFE10.7MS3A10-A

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFELA10M7HAA0-B0 10.700 ±30kHz within 180 ±40kHz 470 max. within 3.5 ±1.5dB 35 min.

CERAFIL low profile type – SFELB10M7HA00-B0 or SFE10.7MS3C10-A

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFELB10M7HA00-B0 10.700 ±30kHz within 180 ±40kHz 470 max. within 3.5 ±2.0dB 35 min.

CERAFIL chip type SFECV – SFECV10M7HA00-R0

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFECV10M7HA00-R0 10.700 ±30kHz within 180 ±40kHz 470 max. within 4.0 ±2.0 dB 35 min.

CERAFIL small chip type SFECS – SFECS10M7HA00-R0

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFECS10M7HA00-R0 10.700 ±30kHz within 180 ±40kHz 470 max. within 4.5 ±2.0 dB 30 min.

CERAFIL three-elements high selectivity type SFTLA  – SFTLA10M7HA00-B0 or SFT10.7MS3-A

Part Number Center Frequency (fo) (MHz) 3dB Bandwidth (kHz) Attenuation (kHz) Insertion Loss (dB) Spurious Attenuation (dB)
SFTLA10M7HA00-B0 10.700 ±30kHz within 180 ±40kHz 550 max. within 5.5 ±2.5dB 50 min.

Official recommendation is the standard lead type, which can offer enough performance at lower cost, while you can choose low loss type for even better performance, at a higher cost, and they’re perfectly interchangeable on PT4301 or PT4302 superheterodyne receiver module, the actual choice depends on budget and availability of parts.

For more information on Murata’s CERAFIL series 10.7Mhz ceramic filter, please check out the pdf file for Murata ceramic filter catalogue and Murata lead type ceramic filter product marking guide for more details, you can download pdf file by right click the link and choose save link as.

Also please note Murata has now changed part number of 10.7Mhz ceramic filter, and the new model number all starts with SFELF instead of old SFELA, for example, the recommended model type has now become SFELF10M7HA00-B0, which equals to old type SFELA10M7HA00-B0, we have also attached updated Murata ceramic filter catalogue for your reference.