FSF-5050 Series · RF/IF SAW Bandpass Filters
364.5 & 367.5 MHz SAW Bandpass Filters
FSF-5050-364M5 & FSF-5050-367M5
Two frequency options for RF signal selection and compatible IF paths. Choose by the specified passband, operating temperature and loss budget.
Top views (left), bottom views (right).
Model selection
Choose the Required Passband
FSF-5050-364M5
364.5 MHz
Typical center frequency
- Specified passband
- 361–368 MHz
- Insertion loss
- 2.0 dB typ. / 3.5 dB max.
- Operating temperature
- −30 to +85 °C
Evaluate when the 361–368 MHz interval covers the wanted signal and the listed temperature range meets the application.
FSF-5050-367M5
367.5 MHz
Typical center frequency
- Specified passband
- 366.5–368.5 MHz
- Insertion loss
- 1.7 dB typ. / 3.0 dB max.
- Operating temperature
- −40 to +85 °C
Evaluate for the 366.5–368.5 MHz signal interval, including applications requiring operation down to −40 °C.
The specified passbands are not 3 dB bandwidths. Insertion-loss and ripple limits apply over each model’s own interval. Confirm frequency coverage, temperature, rejection and interface requirements before considering substitution.
Electrical specifications
Compare Six Key Parameters
Conditions remain attached to the applicable model. Typical values support initial selection; confirm production limits with FCom.
Scroll horizontally to view all columns.
| Parameter | FSF-5050-364M5 | FSF-5050-367M5 |
|---|---|---|
| Center frequency, fc | 364.5 MHz typ. | 367.5 MHz typ. |
| Specified passband | 361–368 MHzNot specified as 3 dB bandwidth | 366.5–368.5 MHzNot specified as 3 dB bandwidth |
| Insertion loss | 2.0 dB typ. / 3.5 dB max.361–368 MHz | 1.7 dB typ. / 3.0 dB max.366.5–368.5 MHz |
| Amplitude ripple | 0.7 dB typ. / 2.0 dB max.361–368 MHz | 0.3 dB typ. / 1.4 dB max.366.5–368.5 MHz |
| Operating temperature | −30 °C min. / +85 °C max. | −40 °C min. / +85 °C max. |
| Source / load test terminations | 50 Ω / 50 ΩDevice impedance not specified | 50 Ω / 50 ΩDevice impedance not specified |
No 3 dB bandwidth or electrical measurement temperature is specified in the supplied FCom pages. Unlisted limits are not zero. Full supplied data, including model-specific attenuation and the 364M5 passband VSWR, are available in the combined datasheet.
Typical applications
Select the Signal Band Your Design Needs
RF Band Selection
Use the applicable specified passband for RF filtering near 364.5 or 367.5 MHz. Check the complete attenuation table against interfering signals.
Receiver Front-End Filtering
Evaluate signal selection ahead of downstream receiver stages. Include insertion loss, ripple and source/load conditions in the front-end budget.
Compatible IF Paths
Consider either model in an IF path only when its center frequency and specified passband fit the architecture. Confirm usable signal bandwidth and operating temperature.
Integration notes
Confirm the Interface and Rejection Requirements
Reference Test Connection
Both reference circuits use 50 Ω source/load terminations and show direct connections without external matching components. The device’s own input/output impedances are not specified.
Grounding and Layout
Ground pins 1, 3, 4, 5, 7 and 8 for the reference test connection. Confirm the signal-pin orientation and land pattern against the applicable FCom drawing.
Attenuation Criteria
The datasheet attenuation values use an absolute 0 dB reference. They are not relative to insertion loss. Identify required rejection frequencies explicitly and use the selected model’s limits.
A direct connection in the reference test circuit does not establish performance on every PCB. Evaluate the intended source, load, grounding and board response before design release.
Shared package
Package & Pin Assignment
5.0 × 5.0 mm · Eight-Pad SMD
The shared FCom pin table applies to both listed models. Pins 2 and 6 are identified as Input/Output; verify the intended test direction and drawing orientation before layout release.
Maximum height requires confirmation. The supplied FCom drawings show 1.5 mm maximum, while the reference outlines show 1.7 mm maximum. Confirm the applicable package height and PCB land pattern with FCom.
For other pin requirements, contact FCom. A common footprint does not establish electrical interchangeability.
| Pin | Function |
|---|---|
| 2 | Input/Output |
| 6 | Input/Output |
| 1, 3, 5, 7 | Ground |
| 4, 8 | Case ground |
Selection and design-in support
Bring the Passband and System Requirements Together
Share the selected model, application, required passband, source/load requirements, temperature range and rejection targets. Include sample quantity and estimated annual volume so the inquiry covers evaluation and purchasing needs.
Confirm the applicable specification, complete ordering code and mechanical drawing with FCom. Additional rejection requirements need an agreed limit for the selected configuration.
Continue your selection
Engineering questions
Frequently Asked Questions
How do I choose between the 364.5 MHz and 367.5 MHz models?
Choose by the required signal interval and operating temperature. FSF-5050-364M5 specifies 361–368 MHz and −30 to +85 °C operation. FSF-5050-367M5 specifies 366.5–368.5 MHz and −40 to +85 °C operation. Their insertion-loss and ripple limits apply over different intervals, so a shared package does not establish interchangeability.
Are these specified passbands the 3 dB bandwidths?
No. The supplied FCom sheet specifies the frequency intervals over which insertion loss and ripple apply. It does not specify a 3 dB bandwidth for either model. Do not convert the span of either interval into a guaranteed 3 dB bandwidth.
Do the reference tests use external matching components?
Both models use 50 Ω source and load test terminations. The reference circuits show direct connections with no external matching components. Device input and output impedances are not specified; verify the response with the intended source, load and PCB before design release.
How should I interpret the attenuation data?
The attenuation values in the supplied datasheet are absolute values referenced to 0 dB, not values relative to insertion loss. Check the row and frequency interval for the selected model. Provide any additional rejection requirement to FCom for confirmation rather than assuming a limit at an unlisted frequency.
Do the models share the same package and pin functions?
The supplied FCom pages list a 5.0 × 5.0 mm eight-pad SMD package, pins 2 and 6 as Input/Output, pins 1, 3, 5 and 7 as ground, and pins 4 and 8 as case ground. The FCom drawing shows 1.5 mm maximum height, while the reference outlines show 1.7 mm maximum. Confirm the applicable height, pin orientation and land pattern before layout release.
Which datasheet page applies to each model?
The combined FCom datasheet contains FSF-5050-364M5 on page 1 and FSF-5050-367M5 on page 2. Each model card links to its page in the same PDF. Include the selected model, required passband, source/load requirements, operating temperature, rejection requirements, sample quantity and estimated annual volume in an inquiry.