FSF-5050 Series · RF Bandpass Filter
916.3 MHz SAW Bandpass Filter
FSF-5050-916M3
Narrowband UHF signal selection for receiver preselection and RF test paths. Evaluate the 1.1 MHz typical 3 dB bandwidth with the specified external matching network.
Key Features
Define the Passband. Check the Interface.
Center Frequency
916.3 MHz
Typical center frequency for narrowband UHF filtering.
3 dB Bandwidth
1.1 MHz typ.
Use the stated 3 dB criterion; minimum and maximum bandwidth limits are not listed.
Minimum Insertion Loss
5.0 dB typ.
6.0 dB maximum for ILmin. Allow for filter loss and matching in the receiver gain budget.
The bandwidth value follows the FCom electrical table. Confirm the applicable specification and full ordering code for your design; typical values are not guaranteed limits.
Electrical Specifications
Six Key Selection Parameters
Reference values for the listed FCom model. The operating range does not establish a measurement temperature or guarantee every typical value across that range.
Scroll horizontally to view all columns.
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency, fc | — | 916.3 | — | MHz | Typical value in the electrical table |
| 3 dB bandwidth | — | 1.1 | — | MHz | 3 dB criterion |
| Minimum insertion loss, ILmin | — | 5.0 | 6.0 | dB | Minimum loss; not a whole-passband loss limit |
| Amplitude ripple | — | — | — | dB | Not specified |
| Operating temperature | −40 | — | +85 | °C | Operating range |
| Storage temperature | −40 | — | +85 | °C | Storage range |
“—” means no value is specified, not zero. Test terminations: 50 Ω source and 50 Ω load, with external matching at both ports. Device input/output impedance and electrical measurement temperature are not specified in the supplied FCom sheet. Refer to the datasheet for the complete supplied information.
Typical Applications
Narrowband Filtering at 916.3 MHz
Receiver Preselection
Evaluate the filter in a receiver RF path requiring selection near 916.3 MHz. Check wanted-signal bandwidth, matching and the front-end loss budget.
UHF Signal Selection
Select a narrow RF band for downstream processing. Confirm the required usable passband and rejection limits under the intended operating conditions.
RF Test & Measurement
Evaluate frequency-selective filtering in a 916.3 MHz test path, using defined source/load terminations and measurement reference planes.
Integration Notes
Use the Specified Matching Conditions
Port Matching
The test network uses a series 18 nH inductor at each port and a shunt 4 pF capacitor on each test-port side. Source and load terminations are 50 Ω.
Component Selection
The FCom sheet references Coilcraft CS series 0805 inductors and Murata GRM series 0402 capacitors. Evaluate actual components and PCB parasitics when implementing the network.
Board Evaluation
Confirm source/load requirements, grounding, pad orientation and the usable passband on the target PCB. A shared package size does not establish electrical interchangeability.
50 Ω describes the matched test environment. It does not specify the device’s bare-port impedance or establish direct 50 Ω connection without matching.
Package & Pin Assignment
5.0 × 5.0 mm, Eight-Pad SMD Package
FSF-5050-916M3 uses the listed eight-pad, no-lead package. Pin functions below follow the supplied FCom sheet.
Confirm maximum height before layout release. The supplied sheet retains a 1.5 mm maximum-height template and identifies a 1.7 mm reference height. The applicable maximum height and PCB land pattern require confirmation.
Verify drawing orientation and pad numbering before PCB release. For other pin configurations, contact FCom.
| Pin | Function |
|---|---|
| 2 | Input |
| 6 | Output |
| 1 | Input ground |
| 5 | Output ground |
| 3, 4, 7, 8 | Ground |
Selection and Design-In Support
Bring Your RF Requirements to FCom
Share the required bandwidth and dB criterion, source/load requirements, operating temperature and application. Include sample quantity and estimated annual volume, and ask FCom to confirm the applicable specification, mechanical drawing and complete ordering code.
Identify any bandwidth tolerance, ripple, rejection or mechanical-clearance requirement that needs explicit agreement.
Engineering Questions
Frequently Asked Questions
Is the bandwidth 1.1 MHz or 1.2 MHz?
The applicable FCom electrical table lists a typical 3 dB bandwidth of 1.1 MHz. The reference document cover uses 1.2 MHz. Use 1.1 MHz for initial selection and confirm the required bandwidth limits with FCom; a guaranteed minimum bandwidth is not listed.
Can I connect the filter directly to a 50 Ω signal path?
The stated 50 Ω values describe the source and load of the matched test circuit. Each port uses a series 18 nH inductor and a shunt 4 pF capacitor on the test-port side. The device input and output impedances are not specified, so direct 50 Ω compatibility is not established.
Does 6.0 dB describe insertion loss across the entire passband?
No. The listed parameter is minimum insertion loss, ILmin: 5.0 dB typical and 6.0 dB maximum. It does not define worst-case loss at every passband frequency. Amplitude ripple is not specified; confirm the usable passband and loss budget for your signal.
Which pins are input, output and ground?
The FCom pin table identifies pin 2 as input and pin 6 as output. Pin 1 is input ground, pin 5 is output ground, and pins 3, 4, 7 and 8 are ground. Confirm pad numbering and viewing direction against the applicable package drawing before PCB release.
What package height should I use for mechanical design?
The package footprint is 5.0 × 5.0 mm with eight no-lead SMD pads. The supplied FCom sheet retains a 1.5 mm maximum-height template and notes a 1.7 mm reference height. Confirm the applicable maximum height and land pattern with FCom before finalizing mechanical clearance or PCB layout.
What should I include in an inquiry?
Include FSF-5050-916M3, the application, required bandwidth and dB criterion, source and load requirements, operating temperature, sample quantity and estimated annual volume. Confirm the applicable specification and complete ordering code with FCom.