FSF-5050-500M / 504M IF SAW Filter Series

This page consolidates FCom Fuji Crystal solutions for the 500 MHz and 504 MHz bands on the FSF-5050 IF SAW platform. With a 5.0×5.0mm SMD footprint, the series supports sub-GHz receiver front ends that require a practical balance of low loss, reliable out-of-band rejection and stable volume-production consistency.

500 / 504 MHz 5.0×5.0mm SMD Sub-GHz Front End Production Consistency

FSF-5050-500M/504M IF SAW filter series product image (5.0×5.0mm)

Key Features

500/504 MHz IF options on a common FSF-5050 5.0×5.0mm SMD footprint
Low insertion loss to help protect receiver noise figure and sensitivity
Strong out-of-band rejection to reduce desensitization in coexistence environments
Stable passband behavior and production consistency for scalable modules
Customization evaluation for bandwidth, rejection, group delay and temperature targets

Key Specs

Platform FSF-5050 IF SAW Series

Center Bands 500 MHz / 504 MHz

Package 5.0×5.0 mm SMD

Quick summary for system planning. Verify electrical specifications and test conditions in the datasheet (typical RF evaluation assumes a 50 Ω environment unless otherwise specified).

Target Systems / Typical Standards Context

The FSF-5050-500M/504M series is designed for sub-GHz receive chains where repeatable selectivity and reliable blocking resilience are required, including private radio architectures, industrial telemetry receivers, and modular sub-GHz front ends that integrate a consistent 5.0×5.0mm SAW platform across multiple frequency plans.

Typical IF Placement

In a classic receiver chain, these IF SAW filters are commonly placed to define the desired passband while limiting unwanted energy that can drive nonlinear behavior downstream:

Preselection / IF filtering: after mixer or within an IF module to suppress images and blockers
Dynamic range protection: reducing large out-of-band signals before high-gain stages
Module consistency: stabilizing passband behavior across production and temperature variation

Detailed Specifications (Part Overview)

FCom Part Number	Center Frequency	Package	Recommended Use & Notes
FSF-5050-500M	500 MHz	5.0×5.0mm SMD	Designed for 500 MHz sub-GHz receiver and IF filtering needs, suitable for industrial and private wireless systems requiring robust out-of-band suppression.
FSF-5050-504M	504 MHz	5.0×5.0mm SMD	Optimized for 504 MHz front-end preselection and IF filtering, enabling coherent planning with adjacent bands to improve sensitivity and interference resilience.

For full electrical metrics (bandwidth, insertion loss, stopband attenuation, ripple, group delay and test conditions), refer to the datasheets in Documents & downloads.

Typical Applications

Industrial telemetry and data return links
Private radio and dedicated sub-GHz receivers
Sub-GHz module preselection and IF filtering
Measurement, control and monitoring systems
High-reliability IoT gateways and base-side equipment
Multi-band front ends needing strong interference control

Why these specs matter in sub-GHz receivers

At sub-GHz, receiver sensitivity is often limited not only by noise figure, but by blocking and coexistence. A low-loss, well-specified IF SAW filter improves the receiver’s ability to maintain gain and linearity in the presence of large adjacent or out-of-band signals—helping stabilize real-world performance in dense spectrum environments.

Selection & Design Notes

1. Start with your system IF plan

Confirm the required bandwidth, adjacent-channel spacing and interference map for your superheterodyne or direct-conversion architecture. Then select the FSF-5050 variant that best matches the 500/504 MHz IF plan.

2. Focus on out-of-band rejection and receiver dynamic range

Sub-GHz systems often face coexistence interference from nearby ISM and private bands, strong uplink signals and LO spurs. A properly specified IF SAW filter helps reduce intermodulation risk in downstream LNAs and mixers.

3. Matching / impedance notes

For 50 Ω designs, keep traces short with solid ground return paths, and minimize unnecessary vias and sharp corners. When needed, apply FCom-recommended matching components to optimize insertion loss and out-of-band behavior.

Ordering Code / Options

Frequency options

Select FSF-5050-500M or FSF-5050-504M based on your IF plan and channel spacing. For adjacent bands or wider platform planning, review related FSF-5050 collections and single-frequency variants.

Temperature and reliability considerations

If your deployment includes wider ambient temperature exposure, vibration constraints, or additional screening requirements, share your environmental window and lifetime targets for a tailored recommendation.

Selection Path / Upgrade Options

For adjacent or expansion frequency plans on the same FSF-5050 platform, you may also consider: FSF-5050-470M~475M, FSF-5050-480M, FSF-5050-499M~499M25, FSF-5050-554M, FSF-5050-584M, FSF-5050-604M5~609M9.

Documents & downloads

Datasheets

For the fastest evaluation cycle, include your IF plan, LO configuration, and target metrics (insertion loss, rejection, group delay) when requesting samples or an RFQ.

Package outline

Outline image for mechanical integration and documentation. Confirm pad design and reflow profile in the datasheet / engineering guidance.

FAQ

What is the main difference between FSF-5050-500M and FSF-5050-504M?

Both use the same 5.0×5.0mm FSF-5050 IF SAW platform. The key difference is center frequency (500 vs 504 MHz) and the corresponding passband configuration. Choose based on your IF plan, channel spacing and interference profile.

Which applications does the FSF-5050-500M/504M series target?

Typical targets include industrial telemetry, private radio receivers, sub-GHz module front ends, and measurement/control systems where low loss and reliable out-of-band rejection improve sensitivity and coexistence robustness.

Is there public pricing for these SAW filters?

Pricing is quote-based. Share your part selection (500M or 504M), target volume, and requirements, then request an RFQ via the Contact page to receive the latest commercial offer.

What are typical MOQ and lead time?

MOQ and lead time depend on the exact part, screening options, and production schedule. Contact FCom with your forecast and destination, and we will confirm the current MOQ and lead time for your project.

Can I request samples and engineering support for evaluation?

Yes. Provide your block diagram, IF plan, LO configuration, and target metrics (insertion loss, rejection, group delay), and FCom will recommend suitable options and support sampling and validation.

Can FCom customize bandwidth or rejection targets?

Yes. If you require specific bandwidth, rejection, group delay, or temperature targets, FCom can evaluate a customized specification based on the FSF-5050 platform.

Request RFQ, samples, or a custom evaluation

Contact FCom Fuji Crystal for FSF-5050-500M/504M selection guidance, test support and customization assessment across bandwidth, rejection and temperature targets. Use the Contact page to request an RFQ and share your IF plan and validation goals.

Contact / RFQ: https://www.fujicrystal.com/contact.html

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