FSF-5050-916M3 916.3 MHz RF SAW Filter

FSF-5050-916M3 is an FCom Fuji Crystal 916.3 MHz narrowband RF SAW filter in a 5.0×5.0 mm SMD package. It is designed for 915/920 MHz ISM, Sub-GHz IoT, telemetry and channelized receiver chains where higher selectivity and out-of-band interference suppression are required.

Key Specs (Reference)

916.3 MHz ~1.1 MHz (3 dB BW) Low IL Strong Rejection SMD 5.0×5.0 mm -40 to +85 °C (ref.)

Reference values are typically measured in a 50 Ω environment with an application-appropriate matching network; final results vary with PCB parasitics and layout.

Center Frequency (Fc)916.3 MHz

3 dB Bandwidth~1.1 MHz

Insertion Loss (typ.)~5.0 dB (max 6.0 dB)

Max Input Power (ref.)10 dBm

Package5.0 × 5.0 mm, 8-pad SMD

Operating Temp (ref.)-40 °C to +85 °C

Request RFQ / Samples Contact Us

Temperature and RF performance depend on the matching network, measurement fixture and PCB parasitics. This page is for engineering selection; final release should follow FCom Fuji Crystal confirmation data and lab measurements.

FSF-5050-916M3 RF SAW filter · 916.3MHz · 5.0×5.0mm SMD · narrowband high rejection — Image is for series illustration; actual marking may vary by shipping revision.

Key Features

Narrowband selectivity: ~1.1 MHz (3 dB BW) to help protect sensitivity in congested RF environments.
Low insertion loss (reference): ~5.0 dB typ. (6.0 dB max) depending on impedance and matching.
Strong out-of-band rejection: improves adjacent-channel and blocker suppression (offset- and layout-dependent).
Compact SMD footprint: 5.0×5.0 mm 8-pad package for dense Sub-GHz receiver layouts.
Receiver-friendly integration: compatible with practical L/C matching for 50 Ω or non-50 Ω environments.

Target Systems / Typical Placement

Target systems / standards (examples)

915/920 MHz ISM band receivers for Sub-GHz IoT endpoints, gateways and telemetry links
Channelized narrowband receivers (FSK/OOK/LoRa-class front ends) requiring higher blocker immunity
Industrial wireless monitoring and sensing nodes in interference-heavy deployments

Typical RF placement (reference)

As a preselect filter near the RF input (after antenna switch/balun) when selectivity is prioritized
Between LNA and mixer when noise figure budget is sensitive and post-LNA filtering is preferred

Model Overview

FCom Part Number	Positioning	Reference Summary
FSF-5050-916M3	916.3 MHz narrowband RF SAW filter for 915/920 MHz ISM-related applications	~1.1 MHz (3 dB BW); insertion loss ~5.0 dB (max 6.0 dB); strong out-of-band rejection (varies by offset and matching); 5.0×5.0 mm SMD.

Detailed Specifications (Engineering Reference)

Center Frequency (Fc)	916.3 MHz (typ.)
3 dB Bandwidth (BW)	~1.1 MHz (typ.)
Insertion Loss (IL)	~5.0 dB (typ.); 6.0 dB max (dependent on conditions/matching)
Out-of-Band Rejection (example)	Rejection can reach 30 dB+ levels at adjacent/offset points (dependent on offset and test conditions). Define critical suppression points from your system mask (adjacent, image, spurs) and we can help map the best variant and matching.
Ratings (ref.)	Max input power: 10 dBm; operating temperature: -40 °C to +85 °C; storage temperature: -40 °C to +85 °C (confirm per project).
Temperature Coefficient (ref.)	TCf (typ.): -0.036 ppm/°C²

Matching / Impedance Notes & Layout Guidance

Matching network: Start from a reference L/C network, then tune passband edges using VNA S11/S21 to balance insertion loss and rejection.
Trace & grounding: Keep I/O traces short and controlled-impedance; maintain a solid ground plane around the device to reduce parasitics affecting passband shape and rejection.
ESD/protection: If adding TVS/protection, account for parasitic capacitance which may shift band edges and increase loss; place protection at suitable nodes and validate with measurements.

Example Matching (Reference)

A symmetric L/C network (e.g., L1=L2, C1=C2) is a practical starting point. Final values should be optimized against your mask, impedance environment and PCB parasitics through simulation and lab tuning. If you share a block diagram and spectrum mask, we can provide a more production-oriented suggestion.

Package & Pads (Text Summary)

Size: 5.0 × 5.0 mm; height ~1.5 mm max (ref.).
Pins: Input, Output and multiple Ground pads (confirm per revision).
Footprint: Use the recommended 5×5 8-pad layout, and add sufficient ground vias near ground pads to improve return path and shielding.

Reflow Profile (Reference)

Preheat: 150–180 °C for 60–90 s (ref.)
Peak: 260 °C (+0 / -5 °C) for 20–40 s (ref.)
Reflow cycles: 2 (ref.)

Actual reflow settings depend on your line, solder paste and board stack-up; validate with reliability and visual inspection.

Applications (Why These Specs Matter)

915/920 MHz ISM receivers: narrowband selectivity helps improve adjacent-channel and blocker tolerance.
Sub-GHz IoT and telemetry modules: stronger rejection improves interference margin and robustness in crowded bands.
Professional wireless monitoring: better image and adjacent-channel suppression supports cleaner demodulation.
Industrial wireless sensing: enhanced immunity when multiple emitters share the same spectrum.

Ordering Code / Options

FSF-5050-916M3 is a standard reference point for 916.3 MHz narrowband applications. If your project needs a nearby center frequency, different bandwidth, or a different temperature grade, share the mask (passband/stopband points), impedance and power level for evaluation.

Selection Path / Upgrade Options

Nearby frequency families in the same 5.0×5.0mm class: FSF-5050-757M5, FSF-5050-787M5, FSF-5050-886M, FSF-5050-974M3, FSF-5050-1000M, FSF-5050-862M5~869M6
For system-level design context, see the application guide in the Related Links section below.

Documents & Downloads

Datasheet

Request the latest datasheet and matching guidance (mask/BW/impedance) via RFQ.

Request Datasheet / RFQ Contact Support

Package Outline (PNG)

5.0×5.0mm SAW filter package outline (reference).

Open package outline FSF-5050-916M3 RF SAW filter package outline · 5.0×5.0mm SMD

FAQ

Q1: Why choose FSF-5050-916M3 over a wider-band filter?

A1: This model prioritizes narrowband selectivity and stronger out-of-band rejection, helping receiver chains maintain sensitivity and blocking performance in interference-heavy environments.

Q2: What most affects insertion loss and rejection in my PCB?

A2: The surrounding impedance environment, component tolerances, routing parasitics and ground return quality are the dominant factors. Practical VNA tuning and close placement of matching components are recommended.

Q3: Can the operating temperature be extended beyond -40 to +85 °C?

A3: Depending on the project, wider-temperature variants can be evaluated. Please provide your temperature profile, power level and spectrum mask for feasibility review.

Q4: Can you offer nearby center frequencies (e.g., 915 or 920 MHz) and bandwidth options?

A4: Yes. Share your key passband/stopband points, image frequency, impedance and size constraints so we can propose the closest fit with schedule expectations.

Q5: How do I request an RFQ if pricing is not listed?

A5: This is a B2B product and pricing depends on frequency variant, quantity, qualification and lead time. Send your requirements via RFQ/Contact and we will reply with samples/MOQ/lead time options.

Technical Support & Compliance

Application engineering support: share your spectrum mask (passband/stopband), impedance, power level, and layout constraints for selection and matching guidance.
ISO certifications: ISO9001, ISO14001

Disclaimer: This page is for engineering selection and quick integration reference and does not constitute a guaranteed specification. Final SAW filter performance depends on matching, PCB layout, measurement methods and operating conditions. Please use FCom Fuji Crystal’s final confirmation data and measurements for production release.