FSF-5050 Series · SAW Bandpass Filter
757.5 MHz SAW Bandpass Filter
FSF-5050-757M5
Narrowband RF filtering for 757.5 MHz receiver paths, with a specified 757–758 MHz passband in a 5.0 × 5.0 mm surface-mount package.
Key Features
Define the Passband and Interface
Specified Passband
757–758 MHz
Specified passband with a 1 MHz span. This is not a 3 dB bandwidth specification.
Insertion Loss
2.2 dB typ.
5.0 dB maximum over 757–758 MHz. Allow for filter loss in the receiver gain budget.
Amplitude Ripple
0.2 dB typ.
1.5 dB maximum over 757–758 MHz.
The specified passband 757–758 MHz is a frequency range, not the 3 dB bandwidth. A 3 dB bandwidth is not specified in the supplied datasheet.
Electrical Specifications
Six Key Selection Parameters
Insertion loss and amplitude ripple are specified over 757–758 MHz. The documented test setup uses a 50 ohm source and a 50 ohm load with direct connection. Electrical measurement temperature is not stated in the supplied table.
Scroll horizontally to view all columns.
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 757.5 | — | MHz | Typical center frequency |
| Specified passband | — | — | — | MHz | 757–758 MHz; span 1 MHz |
| Insertion loss | — | 2.2 | 5.0 | dB | Over 757–758 MHz |
| Amplitude ripple | — | 0.2 | 1.5 | dB | Over 757–758 MHz |
| 3 dB bandwidth | — | — | — | MHz | Not specified |
| Operating temperature | −30 | — | +70 | °C | Operating limits; not an electrical test condition |
— = not specified in that limit column. The passband range is stated separately; it is not a typical bandwidth value. A 1 MHz passband span does not define the 3 dB bandwidth. Storage range is −40 to +85 °C. Typical values are for design guidance; consult the FCom datasheet and confirm applicable limits for your design.
Typical Applications
Filtering within a 757.5 MHz RF Signal Path
Narrowband UHF Signal Selection
Bandpass filtering for a receiver path whose wanted signal fits within the specified 757–758 MHz passband. Check the required signal bandwidth and permitted insertion loss.
Receiver Preselection
Evaluate the filter ahead of subsequent receiver stages to limit unwanted out-of-band energy. Confirm rejection and system noise performance for the intended blockers.
RF Test and Measurement
Frequency-selective filtering in a 757.5 MHz measurement path. Account for passband loss and ripple when assessing the complete setup.
Integration Notes
Start with the Documented Test Conditions
Source and Load
50 ohms each in the reference test setup. These values do not specify the device input or output impedance.
Matching and Layout
Evaluate the actual source, load, interconnect and grounding. Direct connection in the test setup does not guarantee the same response in every PCB implementation.
Temperature
Operating range −30 to +70 °C; storage range −40 to +85 °C. The electrical measurement temperature is not stated. Confirm applicable test conditions and limits across your required temperature range.
Release Checks
Verify bandwidth definition, acceptable loss and ripple, blocker conditions and terminal orientation before finalizing the design.
Package & Pin Assignment
Compact 8-Terminal SMD Package
Use the mechanical drawing in the FCom datasheet to check pad numbering, dimensions and orientation. The product photograph is for identification, not a PCB footprint.
- Body dimensions
- 5.0 × 5.0 mm
- Maximum height
- 1.5 mm
- Package type
- 8-SMD, no lead
Contact FCom to discuss other pin configurations.
| Pin(s) | Function |
|---|---|
| 2 | Input |
| 6 | Output |
| 1, 3, 5, 7 | Ground |
| 4, 8 | Case ground |
Selection and Design-In Support
Define the Conditions That Matter to Your Design
Include your signal frequency range, required bandwidth definition, source and load requirements, operating temperature, sample quantity and estimated usage when contacting FCom. Use FSF-5050-757M5 as the model reference and confirm the complete ordering code before placing an order.
The model designation alone is not a confirmed complete ordering code.
Engineering Questions
Frequently Asked Questions
Is the 1 MHz passband span the 3 dB bandwidth?
No. The specified passband is 757–758 MHz, a span of 1 MHz. The 3 dB bandwidth is not specified in the supplied datasheet and must not be inferred from this range.
Does the filter have a specified 50 ohm device impedance?
The documented test setup uses a 50 ohm source and a 50 ohm load with direct connection. The device input and output impedances are not specified. Evaluate performance with the actual source, load and PCB layout.
Which terminals are used for the signal and ground?
Pin 2 is the input and pin 6 is the output. Pins 1, 3, 5 and 7 are ground terminals; pins 4 and 8 are case ground. Confirm terminal orientation against the FCom package drawing before PCB release.
What temperature conditions apply?
The operating range is −30 to +70 °C and the storage range is −40 to +85 °C. The supplied electrical table does not state a measurement temperature. Confirm the applicable test temperature and full-temperature limits for your design.
What information should I include in an inquiry?
Include FSF-5050-757M5, the required signal frequency range and bandwidth definition, source and load requirements, temperature range, sample quantity and estimated usage. Confirm the complete ordering code with FCom before ordering.