FSF-5050 Series · SAW Bandpass Filter
554 MHz SAW Bandpass Filter
FSF-5050-554M
A 5.0 × 5.0 mm SMD filter for RF/IF receiver filtering and UHF signal selection, with a specified 548–560 MHz passband.
The photograph is not a pin-orientation reference.
Key Features
Defined Passband and Operating Range
Two characteristics that drive selection for the FSF-5050-554M: the interval over which insertion loss and ripple are specified, and the operating temperature range.
Specified passband
548–560 MHz
Insertion loss and amplitude ripple are specified over this frequency interval. A 3 dB bandwidth value is not provided.
Operating temperature
−20 to +75 °C
Operating range for the eight-pad SMD filter. The separate −40 to +85 °C storage rating does not extend this operating range.
The 548–560 MHz interval is the specified passband for insertion loss and ripple. Its 12 MHz span must not be relabeled as a specified 3 dB bandwidth.
Electrical Specifications
Limits with Their Frequency Conditions
Test source and load: 50 Ω / 50 Ω. These are test terminations, not stated device impedances. “—” means a value is not specified, not zero.
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| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 554.0 | — | MHz | FCom Typ. column |
| Specified passband | — | — | — | MHz | 548–560 MHz; insertion-loss and ripple interval |
| Insertion loss | — | 1.5 | 4.5 | dB | Over 548–560 MHz |
| Amplitude ripple | — | 0.7 | 2.0 | dB | Over 548–560 MHz |
| 3 dB bandwidth | — | — | — | MHz | Not specified |
| Operating temperature | −20 | — | +75 | °C | Operating range; separate from storage |
Typical values are for design guidance. Storage temperature is −40 to +85 °C. The supplied FCom table does not state a common electrical measurement temperature. Consult the FCom datasheet for the complete supplied information and confirm applicable production limits with FCom.
Typical Applications
554 MHz RF/IF Signal Selection
UHF receiver front ends
Evaluate bandpass filtering around 554 MHz for signal selection ahead of subsequent receiver processing. Check the wanted-signal spectrum against the 548–560 MHz specified passband and the receiver’s loss budget.
Test and measurement signal chains
Use the specified test conditions when evaluating filtering in an RF/IF measurement path. Confirm required ripple, rejection and temperature conditions for the intended signal band.
Integration Notes
Confirm the Interface for Your Design
Source and load conditions
The stated response uses a 50 Ω source and 50 Ω load. Device input and output impedances are not supplied. Provide the intended source and load requirements to FCom and confirm any matching requirements. The test termination values alone do not define the device impedance or establish a universal matching arrangement.
Application-specific limits
Keep passband insertion loss and amplitude ripple as separate requirements. If the design needs group-delay, return-loss or detailed rejection limits, request confirmation of the applicable FCom specifications. Confirm performance requirements across the intended operating temperatures, using −20 to +75 °C as the stated operating range.
Package & Pin Assignment
5.0 × 5.0 mm, Eight-Pad SMD
The FCom drawing specifies a leadless SMD package with a maximum height of 1.5 mm. Use the numerical pin assignment below for the supplied FCom documentation.
Mechanical dimensions and pad numbering are included in the FCom datasheet. Confirm drawing orientation and the applicable footprint before PCB release. Contact FCom for other pin configurations.
| Pin number | FCom description |
|---|---|
| 2 | Input / Output |
| 6 | Input / Output |
| 1, 3, 5, 7 | To be grounded |
| 4, 8 | Case ground |
Selection and Design-In Support
Discuss Your 554 MHz Requirements
Include the model or center frequency, required signal band and bandwidth definition, source/load requirements, operating temperature, sample quantity and estimated usage. Ask FCom to confirm the complete ordering code and any additional limits needed for the application.
Engineering Questions
Frequently Asked Questions
Is the 548–560 MHz interval a 12 MHz 3 dB bandwidth?
No. It is the specified passband over which insertion loss and amplitude ripple are stated. Its span is 12 MHz, but the FCom datasheet does not provide a 3 dB bandwidth value.
Where do the insertion-loss and ripple values apply?
Both characteristics apply over 548–560 MHz. Insertion loss is 1.5 dB typical and 4.5 dB maximum; amplitude ripple is 0.7 dB typical and 2.0 dB maximum. These are different characteristics and should retain their separate definitions.
Is FSF-5050-554M specified as a 50 Ω device?
The FCom sheet specifies 50 Ω source and load test terminations. Device input and output impedances are not specified. Confirm the intended source, load and matching requirements before applying the published response to the system.
What temperature range should I use for design selection?
The operating range is −20 to +75 °C. The −40 to +85 °C value is the storage range and should not be used as the operating range. The supplied FCom electrical table does not state a common measurement temperature; confirm any temperature-dependent limits required for the application.
Which package and pin assignment apply?
Use the FCom drawing for the 5.0 × 5.0 mm eight-pad, leadless SMD package with a 1.5 mm maximum height. The FCom table lists pins 2 and 6 as Input/Output, pins 1, 3, 5 and 7 as grounds, and pins 4 and 8 as case ground. Confirm drawing orientation and the applicable footprint before PCB release.
What should I include in a technical inquiry?
Include FSF-5050-554M or the required center frequency, signal band and bandwidth definition, source and load requirements, operating temperature, sample quantity and estimated usage. Ask FCom to confirm the complete ordering code and any additional electrical limits required for the design.