Which IF frequencies are covered by the FSF-5050-309M~319M5 family?

The FSF-5050-309M~319M5 family provides three typical IF frequencies: 309 MHz wideband type FSF-5050-309M5, 315 MHz narrowband type FSF-5050-315M, and 319.5 MHz high-selectivity type FSF-5050-319M5. All share the same 5.0×5.0 mm SMD package and PCB footprint for easy platform scaling.

What applications are these IF SAW filters suitable for?

FSF-5050-309M~319M5 IF SAW filters are suitable for professional wireless microphone receiver IF stages, monitor and intercom systems, automotive anti-theft and RKE, garage door openers, and various 300–320 MHz narrowband RF receiver modules and superheterodyne IF channels.

What is the package and system impedance of the FSF-5050-309M~319M5 family?

The FSF-5050-309M~319M5 family uses a 5.0×5.0 mm SM5050-8 surface-mount package. The recommended system impedance is 50 Ω with LC matching networks at the input and output to optimize passband flatness and stopband attenuation.

Do you publish public pricing for this SAW filter family?

Public pricing is typically not listed because cost depends on part number, order volume, test requirements and delivery terms. Please send your target frequency, bandwidth and quantity to request an RFQ.

What are typical MOQ, lead time and sample options?

MOQ and lead time depend on the exact part number and your quality flow. FCom Fuji Crystal supports samples for evaluation, pilot builds, and volume production planning—contact us with your target specs to confirm availability and schedule.

Can the IF frequency or bandwidth be customized?

If you need IF SAW filters outside 309 / 315 / 319.5 MHz or with specific 3 dB bandwidth and stopband requirements, FCom Fuji Crystal can evaluate customized surface acoustic wave filter solutions, including center frequency trimming and matching network recommendations for your project.

Do you provide packaging, test reports or S-parameter support?

Yes. Datasheets are available for each part number, and matching guidance or additional measurement information (such as fixture conditions) can be shared for engineering verification upon request.

FSF-5050-309M~319M5 IF SAW Filter Family

5.0×5.0 mm SMD | 309 / 315 / 319.5 MHz IF designs

FSF-5050-309M~319M5 is a 5.0×5.0 mm IF SAW filter (IF SAW filter) family from FCom Fuji Crystal, positioned as a mid-frequency surface acoustic wave filter solution. It includes a 309 MHz wideband type for audio and digital modulation, FSF-5050-315M optimized for 315 MHz narrowband and RKE, and a 319.5 MHz type for high-selectivity IF channels. The family is well suited for wireless microphone receivers, automotive anti-theft systems and various superheterodyne IF stages.

With a simple 50 Ω matching network, the IF SAW filters deliver good passband flatness and strong adjacent/ image rejection at the RF front end, allowing engineers to switch between different IF schemes using the same SM5050 package.

Package: 5.0×5.0 mm SMD (SM5050) Center frequency: 309 / 315 / 319.5 MHz System impedance: 50 Ω (with external matching) Environmental: Lead-free, RoHS compliant

FSF-5050-309M~319M5 IF SAW filter, 5×5mm SMD, 309/315/319.5MHz family

Key Features

Designed for 300–320 MHz-class superheterodyne IF stages where insertion loss, stopband suppression and repeatable matching are critical to receiver sensitivity and selectivity.

Performance Positioning

Low insertion loss with practical passband flatness for IF gain planning
Strong stopband suppression for image/adjacent rejection in superheterodyne designs
3 frequency points covering wideband, narrowband and high-selectivity IF schemes

Manufacturing & Integration

Standard 5.0×5.0 mm SM5050-8 footprint for platform reuse
50 Ω system with external LC matching for engineering flexibility
Evaluation samples, pilot builds, volume supply and customization support

Product Family Overview

The FSF-5050-309M~319M5 family offers three typical IF frequencies: a 309 MHz wideband type, a 315 MHz narrowband type and a 319.5 MHz high-selectivity type. All three share the same 5.0×5.0 mm SMD package and PCB land pattern, enabling a single platform to cover different IF bandwidths and selectivity requirements in the 300–320 MHz band for IF SAW filters (surface acoustic wave filter solutions).

FSF-5050-309M5

309 MHz wideband IF SAW filter · approx. 10 MHz passband

Center frequency Fc: 309 MHz
Usable passband: 304.225 to 314.285 MHz (approx. 10 MHz)
Insertion loss in passband: typically ~1.9 dB, max. ~3.0 dB
Passband ripple: typically ~0.8 dB, max. ~2.0 dB
Maximum input power: approx. 10 dBm
Maximum DC voltage: approx. 5 V
Operating temperature range: approx. -40 °C to +85 °C
Storage temperature range: approx. -40 °C to +85 °C

FSF-5050-309M5 is suitable for IF stages requiring a wider bandwidth in wireless microphone receivers and audio links, balancing overall insertion loss with flat frequency response.

FSF-5050-315M

315 MHz narrowband IF SAW filter · approx. 600 kHz 3 dB bandwidth

Center frequency Fc: 315.0 MHz
3 dB bandwidth: approx. 600 kHz
Insertion loss in passband: typically ~3.0 dB, max. ~5.5 dB
Maximum input power: approx. 10 dBm
Maximum DC voltage: approx. 12 V
Operating temperature range: approx. -40 °C to +85 °C
Storage temperature range: approx. -40 °C to +85 °C

FSF-5050-315M is optimized for 315 MHz narrowband applications, ideal for automotive keyless entry, security systems, garage door openers, RKE remote controls and narrowband 300–320 MHz RF modules.

FSF-5050-319M5

319.5 MHz high-selectivity IF SAW filter · approx. 0.6 MHz 3 dB bandwidth

Center frequency Fc: 319.42 to 319.58 MHz (typical 319.5 MHz)
3 dB bandwidth: 0.5 to 0.8 MHz (typically ~0.6 MHz)
Insertion loss in passband: min. ~2.2 dB, typical ~2.8 dB
Maximum input power: approx. 10 dBm
Maximum DC voltage: approx. 12 V
Operating temperature range: approx. -40 °C to +85 °C
Storage temperature range: approx. -40 °C to +85 °C

FSF-5050-319M5 is suitable for narrow IF channels with stringent adjacent-channel and image rejection requirements, and can also be used as a fine-selectivity stage in multi-stage IF filter chains.

Key Electrical Specifications

The table below summarizes typical parameters of FSF-5050-309M5, FSF-5050-315M and FSF-5050-319M5 for quick comparison of different IF strategies. Detailed frequency responses and S-parameter files are available from your FCom Fuji Crystal project contact. Test condition note: values are commonly referenced under 50 Ω system impedance with external matching and a defined test fixture.

Part Number	Center Frequency Fc	Passband / 3 dB Bandwidth	Insertion Loss (typ.)	Passband Ripple (typ.)	Package
FSF-5050-309M5	309 MHz	304.225 to 314.285 MHz (approx. 10 MHz)	~1.9 dB	~0.8 dB	SM5050-8, approx. 5.0×5.0 mm
FSF-5050-315M	315 MHz	3 dB bandwidth approx. 0.6 MHz	~3.0 dB	—	SM5050-8, approx. 5.0×5.0 mm
FSF-5050-319M5	319.5 MHz	3 dB bandwidth approx. 0.5–0.8 MHz (typ. 0.6 MHz)	~2.8 dB	—	SM5050-8, approx. 5.0×5.0 mm

Target Systems & Typical IF Placement

Target Systems

Professional wireless microphone receivers and audio links
Automotive RKE / anti-theft / security receivers
Garage door openers and narrowband RF receiver modules
Monitor, intercom and broadcast receiver IF chains

Typical IF Placement (Superheterodyne)

After the first mixer to shape IF bandwidth and improve selectivity
Before IF amplification/limiting to control out-of-band noise contribution
As a single-stage IF filter or as a fine-selectivity stage in multi-stage IF chains

Typical Applications & Design Notes

Typical Application Scenarios

Professional wireless microphone receiver IF stages
Monitor, intercom and broadcast IF filtering
309 / 315 / 319.5 MHz superheterodyne IF channel shaping
Image, adjacent-channel and spurious suppression in RF front ends
315 MHz automotive security, RKE and garage door opener IF links (custom frequencies available on request)
Various 300–320 MHz narrowband RF receiver modules and remotes

Matching and PCB Layout Guidelines

Use series inductors and shunt capacitors at input and output to build L-type or π-type 50 Ω matching networks, optimizing passband flatness and stopband attenuation.
For 315 MHz narrowband IF designs, a common starting point is to use approx. 80 nH series inductors and approx. 13 pF shunt capacitors at both ports to form a symmetric LC network, which can serve as the 50 Ω test fixture and initial matching reference before fine-tuning with the actual PCB and RF IC.
Keep RF traces near the filter as short and symmetric as possible, and avoid unnecessary vias and sharp corners.
Provide a solid ground plane beneath and around the filter, stitching it with multiple vias to minimize ground impedance.
Do not exceed the specified RF power or DC bias ratings for prolonged periods in order to ensure long-term reliability.

In practice, 315 MHz-class narrowband IF SAW filters typically adopt around 600 kHz 3 dB bandwidth, with typical insertion loss in the 3.0–5.5 dB range and 30–50 dB attenuation at image and adjacent-channel frequencies (e.g. Fc−10.7 MHz, Fc−21.4 MHz). These values provide a useful starting point when estimating system noise figure and sensitivity.

Ordering Code / Options

Select the part number by IF center frequency and selectivity target. All variants share the 5.0×5.0 mm SM5050-8 footprint, supporting platform reuse across different receiver bandwidth requirements.

How to Select

309 MHz (FSF-5050-309M5): wideband IF shaping where passband width is prioritized
315 MHz (FSF-5050-315M): narrowband IF for RKE/security-style receivers
319.5 MHz (FSF-5050-319M5): higher selectivity IF channels and tighter adjacent rejection

Selection Path / Upgrade Options

Documents & Downloads

Download the datasheet for each part number. If you need additional measurement information (fixture conditions, recommended matching, or S-parameter support), contact engineering support.

Datasheets

Note: For accurate system estimation, confirm your matching network, fixture definition and measurement bandwidth with your project contact.

FSF-5050 IF SAW filter package outline, SM5050-8, 5×5mm — Package outline: SM5050-8 (reference drawing)

FAQ

Which IF frequencies are covered by the FSF-5050-309M~319M5 family?

The FSF-5050-309M~319M5 family provides three typical IF frequencies: 309 MHz wideband type FSF-5050-309M5, 315 MHz narrowband type FSF-5050-315M, and 319.5 MHz high-selectivity type FSF-5050-319M5. All share the same 5.0×5.0 mm SMD package and PCB footprint for easy platform scaling.
What applications are these IF SAW filters suitable for?

FSF-5050-309M~319M5 IF SAW filters (IF SAW filter family) are suitable for professional wireless microphone receiver IF stages, monitor and intercom systems, automotive anti-theft and RKE, garage door openers, and various 300–320 MHz narrowband RF receiver modules and superheterodyne IF channels.
What is the package and system impedance of the FSF-5050-309M~319M5 family?

The FSF-5050-309M~319M5 family uses a 5.0×5.0 mm SM5050-8 surface-mount package. The recommended system impedance is 50 Ω with LC matching networks at the input and output to optimize passband flatness and stopband attenuation.
Do you publish public pricing for this SAW filter family?

Public pricing is typically not listed because cost depends on part number, order volume, test requirements and delivery terms. Please send your target frequency, bandwidth and quantity to request an RFQ.
What are typical MOQ, lead time and sample options?

MOQ and lead time depend on the exact part number and your quality flow. FCom Fuji Crystal supports samples for evaluation, pilot builds, and volume production planning—contact us with your target specs to confirm availability and schedule.
Can the IF frequency or bandwidth be customized?

If you need IF SAW filters outside 309 / 315 / 319.5 MHz or with specific 3 dB bandwidth and stopband requirements, FCom Fuji Crystal can evaluate customized surface acoustic wave filter solutions, including center frequency trimming and matching network recommendations for your project.
Do you provide packaging, test reports or S-parameter support?

Yes. Datasheets are available for each part number, and matching guidance or additional measurement information (such as fixture conditions) can be shared for engineering verification upon request.

Support & Certifications

If you need engineering support for matching, fixture definition, or IF planning, contact our technical team via Contact Us.