FCom Fuji Crystal · FSF-5050 Series · SAW Filter
230.4 / 231.25 / 232.5 / 234 MHz SAW Filters
FSF-5050-230M4 · FSF-5050-231M25 · FSF-5050-232M5 · FSF-5050-234M
Four frequency options for VHF signal selection and IF receiver filtering in a 5.0 × 5.0 mm SMD package. Match the specified passband, insertion loss, ripple and operating temperature to your design.
Select by passband
Choose the frequency your receiver needs
The four models share a package format, but their electrical limits differ. The combined FCom document contains one page per model.
SAW Filter · 230.4 MHz
FSF-5050-230M4
230.4 MHz
Specified passband: 229.9–230.9 MHz (1.0 MHz interval for IL and ripple)
- Insertion loss
- 2.5 dB typ. / 3.8 dB max.
- Amplitude ripple
- 0.6 dB typ. / 1.8 dB max.
- Operating temperature
- −40 to +85 °C
- Source / load test termination
- 50 Ω / 50 Ω
- 3 dB bandwidth
- — (not specified)
SAW Filter · 231.25 MHz
FSF-5050-231M25
231.25 MHz
Passband width: 12 MHz min. / 16 MHz typ.; no attenuation threshold assigned
- Insertion loss
- 2.0 dB typ. / 3.5 dB max.
- Amplitude ripple
- 0.6 dB typ. / 1.5 dB max.
- Operating temperature
- −40 to +85 °C
- Source / load test termination
- 50 Ω / 50 Ω
- 3 dB bandwidth
- — (not specified)
SAW Filter · 232.5 MHz
FSF-5050-232M5
232.5 MHz
Specified passband: 230.8–234.2 MHz (3.4 MHz interval for IL and ripple)
- Insertion loss
- 2.0 dB typ. / 3.0 dB max.
- Amplitude ripple
- 1.5 dB typ. / 2.0 dB max.
- Operating temperature
- −20 to +65 °C
- Source / load test termination
- 50 Ω / 50 Ω
- 3 dB bandwidth
- — (not specified)
SAW Filter · 234 MHz
FSF-5050-234M
234 MHz
Specified passband: 233–235 MHz (2.0 MHz interval for IL and ripple)
- Insertion loss
- 2.1 dB typ. / 3.3 dB max.
- Amplitude ripple
- 0.8 dB typ. / 2.0 dB max.
- Operating temperature
- −45 to +85 °C
- Source / load test termination
- 50 Ω / 50 Ω single-ended
- 3 dB bandwidth
- — (not specified)
Bandwidth definitions matter. A specified passband interval is not a measured 3 dB bandwidth. The 231M25 bandwidth values also have no stated attenuation threshold. These models are not established as direct substitutes.
Six Key Parameters per Model
Electrical specifications
Insertion loss and amplitude ripple apply over each model’s listed passband. Full limits and stopband frequencies are given in the combined product document.
Scroll horizontally to view all columns.
FSF-5050-230M4
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 230.4 | — | MHz | Stated value; not a frequency-tolerance limit. |
| Specified passband for IL and ripple | 229.9–230.9 (specified range) | MHz | 1.0 MHz interval. Endpoints are range boundaries, not Min./Max. limits. | ||
| Insertion loss | — | 2.5 | 3.8 | dB | Over 229.9–230.9 MHz with 50 Ω source/load. |
| Amplitude ripple | — | 0.6 | 1.8 | dB | Over 229.9–230.9 MHz. |
| Operating temperature | −40 | — | +85 | °C | Operating range. Test temperature not stated. |
| Source / load test termination | 50 / 50 | Ω | Test conditions. Evaluate actual circuit impedances and PCB layout. | ||
3 dB bandwidth is not specified. Stopband attenuation is referenced to attenuation at 230.4 MHz, not to 0 dB. Maximum RF input power: 10 dBm. Maximum DC voltage: 5 V.
FSF-5050-231M25
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 231.25 | — | MHz | Stated value; not a frequency-tolerance limit. |
| Passband width | 12 | 16 | — | MHz | No attenuation threshold is assigned to this bandwidth. Do not treat as a 3 dB bandwidth. |
| Insertion loss | — | 2.0 | 3.5 | dB | Specified over the passband width with 50 Ω source/load. |
| Amplitude ripple | — | 0.6 | 1.5 | dB | Specified over the passband width. |
| Operating temperature | −40 | — | +85 | °C | Operating range. Test temperature not stated. |
| Source / load test termination | 50 / 50 | Ω | Test conditions. Evaluate actual circuit impedances and PCB layout. | ||
3 dB bandwidth is not specified. Stopband attenuation is referenced to 0 dB. Maximum RF input power: 10 dBm. Maximum DC voltage: 5 V. The passband width is stated without a dB threshold; verify the intended measurement definition before selection.
FSF-5050-232M5
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 232.5 | — | MHz | Stated value; not a frequency-tolerance limit. |
| Specified passband for IL and ripple | 230.8–234.2 (specified range) | MHz | 3.4 MHz interval. Endpoints are range boundaries, not Min./Max. limits. | ||
| Insertion loss | — | 2.0 | 3.0 | dB | Over 230.8–234.2 MHz with 50 Ω source/load. |
| Amplitude ripple | — | 1.5 | 2.0 | dB | Over 230.8–234.2 MHz. |
| Operating temperature | −20 | — | +65 | °C | Operating range. Test temperature not stated. |
| Source / load test termination | 50 / 50 | Ω | Test conditions. Evaluate actual circuit impedances and PCB layout. | ||
3 dB bandwidth is not specified. Stopband attenuation is referenced to 0 dB. Maximum RF input power: 10 dBm. Maximum DC voltage: 5 V. Operating temperature range is narrower than the other models.
FSF-5050-234M
| Parameter | Min. | Typ. | Max. | Unit | Definition / condition |
|---|---|---|---|---|---|
| Center frequency | — | 234 | — | MHz | Stated value; not a frequency-tolerance limit. |
| Specified passband for IL and ripple | 233–235 (specified range) | MHz | 2.0 MHz interval. Endpoints are range boundaries, not Min./Max. limits. | ||
| Insertion loss | — | 2.1 | 3.3 | dB | Over 233–235 MHz with 50 Ω single-ended source/load. |
| Amplitude ripple | — | 0.8 | 2.0 | dB | Over 233–235 MHz. |
| Operating temperature | −45 | — | +85 | °C | Operating range. Test temperature not stated. |
| Source / load test termination | 50 / 50 single-ended | Ω | Test conditions. Evaluate actual circuit impedances and PCB layout. | ||
3 dB bandwidth is not specified. Stopband attenuation is referenced to 0 dB. Maximum RF input power: 20 dBm. Maximum DC voltage: 10 V. Extended operating range down to −45 °C. Single-ended test terminations.
Typical Applications
Select the wanted band in your receiver
VHF receiver filtering
Select the model aligned with the receiver’s VHF frequency plan and required signal bandwidth.
RF front-end signal selection
Use the specified passband and stopband limits to assess wanted-signal loss and out-of-band rejection.
Superheterodyne IF stages
Place the selected filter in the IF signal path and evaluate it with the actual preceding and following stages.
Functional application example only. This is not a validated schematic, pin-routing diagram or measured response.
Integration Notes
Confirm the interface and operating limits
Source, load and PCB conditions
Use the stated 50 Ω source and load test conditions as the evaluation reference. Confirm the actual circuit impedances and any matching requirements.
Check loss and ripple over the whole required signal band, then assess rejection at the system’s blocker frequencies.
Verify the applicable pad orientation, ground connections and PCB layout before design release.
Limits are model-specific
230M4, 231M25 and 232M5: maximum input power 10 dBm; maximum DC voltage 5 V.
234M: maximum input power 20 dBm; maximum DC voltage 10 V.
Maximum ratings are limits, not recommended operating targets. Keep operating temperature separate from storage temperature.
Package & Pin Assignment
5.0 × 5.0 mm SMD package
Shared package format for all four FSF-5050 230M4, 231M25, 232M5 and 234M models.
5.0 × 5.0 mm · 1.5 mm maximum height · 8-pad SMD
These dimensions and assignments appear on all four pages of the supplied FCom document. Confirm the applicable mechanical drawing before finalizing the footprint. The table identifies functions without assigning an unverified view orientation.
For other pin configurations, contact FCom.
| Pin(s) | Function |
|---|---|
| 2 | Input / Output |
| 6 | Input / Output |
| 1, 3, 5, 7 | Ground |
| 4, 8 | Case Ground |
Selection and Design-In Support
Bring your frequency plan to FCom
Share the selected model, required bandwidth definition, source/load conditions and temperature range. Include sample quantity, estimated usage and any blocker-frequency targets so the inquiry can address your actual design requirements.
Confirm the complete ordering code and applicable specification with FCom before ordering.
Engineering Questions
Frequently asked questions
Are these four models interchangeable?
No direct interchangeability is established. They share a 5.0 × 5.0 mm package, but center frequency, passband, loss, ripple, rejection and temperature range differ. Check the selected model and its PCB interface before substitution.
Are the listed passbands 3 dB bandwidths?
No. For 230M4, 232M5 and 234M, the listed intervals specify where insertion loss and ripple apply; 3 dB bandwidth is not specified. For 231M25, passband width is 12 MHz min. and 16 MHz typ., without a stated attenuation threshold.
Does 50 Ω mean no matching evaluation is needed?
No. The document specifies 50 Ω source and load test terminations. These conditions do not establish a universal match to every circuit. Evaluate the actual source, load and PCB fixture; 234M explicitly uses single-ended terminations.
Which operating temperature range applies to each model?
230M4 and 231M25 are specified for −40 to +85 °C; 232M5 for −20 to +65 °C; and 234M for −45 to +85 °C. Storage limits are separate and must not be used as operating limits.
How are the signal and ground pads assigned?
The supplied FCom document identifies pins 2 and 6 as Input/Output, pins 1, 3, 5 and 7 as Ground, and pins 4 and 8 as Case Ground for all four models. Use the applicable drawing to confirm pad orientation and signal routing.
What should I include in a technical inquiry?
Include the selected model or center frequency, required passband and bandwidth definition, source and load requirements, operating temperature, sample quantity and estimated usage. Add blocker frequencies and rejection targets where relevant. Confirm the full ordering code with FCom before ordering.