FSF-5050-604M5~609M9 IF SAW Filter Series
604.5 MHz / 609.9 MHz | 5.0×5.0 mm SMD | Low Insertion Loss, High Stopband Attenuation
The FSF-5050-604M5~609M9 IF SAW filter series is optimized for 600 MHz-class IF front ends and offers two center frequency options: 604.5 MHz and 609.9 MHz. With low insertion loss, controlled group delay and strong stopband rejection, these filters help suppress adjacent-channel and image interference and improve receiver sensitivity and system stability.
- Center frequencies: 604.5 MHz (FSF-5050-604M5), 609.9 MHz (FSF-5050-609M9).
- Typical insertion loss around 2.1 / 2.4 dB, passband ripple around 0.2–0.7 dB.
- Typical stopband attenuation up to the 40 dB class from 10–590 MHz and 630–700 MHz.
- 5.0×5.0 mm SMD package, 50 Ω system matching, RoHS compliant and reflow-solderable.
Key Specs at a Glance
Typical values at 25°C with 50 Ω source/load unless otherwise stated. For production designs, request the official datasheet and test conditions.
604.5 MHz / 609.9 MHz
5.0×5.0 mm SMD
~2.1–2.4 dB
50 Ω
Target Systems, Standards, and Typical IF Placement
Target Systems / Use Cases
- 600 MHz-class IF stages in superheterodyne receivers
- Professional/private radio and industrial wireless links
- Fixed Wireless Access (FWA) and point-to-point backhaul
- Measurement instruments and signal/spectrum analysis modules
Typical IF Placement
A common chain is: LNA → Mixer → IF Amp → SAW IF Filter → IF Amp/ADC. The SAW filter improves adjacent-channel tolerance and helps control images/spurs before gain stages or digitization.
If your impedance environment is not 50 Ω, reserve matching pads to optimize return loss and passband flatness.
Series Overview: FSF-5050-604M5 and FSF-5050-609M9 IF SAW Filters
Both devices share the same 5.0×5.0 mm SMD package and a mass-production-ready structure, enabling easy frequency migration on a common PCB footprint. The table below summarizes the key series parameters; please refer to the official specification for detailed conditions:
| Part Number | Center Frequency (MHz) |
Bandwidth (Typ.) | Insertion Loss (Typ.) (dB) |
Passband Ripple (Typ.) (dB) |
Operating Temperature |
|---|---|---|---|---|---|
| FSF-5050-604M5 | 604.5 | Approx. 5–8.5 MHz (2 dB BW) | Approx. 2.1 | Approx. 0.7 (602–607 MHz) | 0°C ~ +50°C |
| FSF-5050-609M9 | 609.9 | Approx. 3–10 MHz (1/3 dB BW) | Approx. 2.4 | Approx. 0.2 (608.4–611.4 MHz) | -40°C ~ +85°C |
Note: The above data are typical reference values. Actual parameters may vary slightly depending on measurement conditions and version. For mass production designs, please request the official datasheet and test report from FCom Fuji Crystal.
Key Features and Typical Applications
Key Features
- Low insertion loss and low VSWR optimized for 50 Ω IF systems.
- Controlled group delay to reduce phase distortion in digital modulation and demodulation.
- High attenuation over a wide stopband from DC to 700 MHz, suppressing spurious and image signals.
- 5.0×5.0 mm SMD package compatible with standard lead-free reflow soldering.
- RoHS compliant and suitable for high-volume SMT production lines.
Typical Applications
- IF filtering in 600 MHz-class superheterodyne receivers and transmitters.
- Private networks, public safety and industrial radio, and wireless data links.
- Microwave backhaul, fixed wireless access (FWA) and point-to-point links.
- IF stages in measurement instruments and spectrum/signal analysis modules.
- For system-level selection guidance, see SAW filter engineering guidance for professional wireless receivers.
FSF-5050-604M5~609M9 IF SAW Filter Electrical Characteristics
FSF-5050-604M5 604.5 MHz IF SAW Filter
| Item | Condition | Unit | Min. | Typ. | Max. |
|---|---|---|---|---|---|
| Center Frequency Fc | — | MHz | — | 604.5 | — |
| Insertion Loss FcIL | Fc | dB | — | 2.1 | 3.0 |
| Passband Ripple | 602–607 MHz | dB | — | 0.7 | 1.5 |
| 2 dB Bandwidth BW2dB | — | MHz | 5 | 8.5 | — |
| Input Power | Continuous | dBm | 10 (maximum rating) | ||
| DC Voltage | — | V | 3 (maximum rating) | ||
| Operating Temperature | — | °C | 0 ~ +50 | ||
| Storage Temperature | — | °C | -40 ~ +85 | ||
FSF-5050-609M9 609.9 MHz IF SAW Filter
| Item | Condition | Unit | Min. | Typ. | Max. |
|---|---|---|---|---|---|
| Center Frequency Fo | — | MHz | — | 609.9 | — |
| Insertion Loss IL | Fo | dB | — | 2.4 | 3.5 |
| 3 dB Bandwidth | — | MHz | 5 | 10.08 | — |
| Input Power | Continuous | dBm | 10 (maximum rating) | ||
| DC Voltage | — | V | 5 (maximum rating) | ||
| Operating Temperature | — | °C | -40 ~ +85 | ||
| Storage Temperature | — | °C | -40 ~ +85 | ||
During design, we recommend simulating and measuring the complete IF chain (including amplifiers, mixers and this SAW filter) to ensure that passband flatness and group delay in the final system meet the relevant communication standard requirements.
Design and PCB Layout Guidelines
- Place the SAW filter in series with a 50 Ω microstrip or stripline with short, symmetrical traces.
- Solder all ground pads and connect them to a solid ground plane to reduce parasitic inductance and noise coupling.
- If the surrounding circuits are not 50 Ω, reserve one or two inductor/capacitor positions for a simple matching network to optimize return loss and passband flatness.
- Use a standard lead-free reflow profile with a peak temperature around 260°C and no more than two reflow cycles, staying within the component ratings.
- For wide operating temperature ranges, perform temperature cycling tests on the complete unit to verify center frequency drift and insertion loss variation in real conditions.
Ordering Code / Options
Select by IF center frequency first, then confirm bandwidth class and temperature grade. If your IF plan is flexible, aligning LO/IF to a standard center frequency can simplify qualification and supply.
| Part Number | Center Frequency | Bandwidth Class (Typ.) | Temperature Grade | System |
|---|---|---|---|---|
| FSF-5050-604M5 | 604.5 MHz | 2 dB BW: ~5–8.5 MHz | 0°C to +50°C | 50 Ω |
| FSF-5050-609M9 | 609.9 MHz | 3 dB BW: ~5–10 MHz | -40°C to +85°C | 50 Ω |
Selection Path / Upgrade Options
- Need a nearby IF center frequency? Consider adjacent FSF-5050 options: 584 MHz, 611–618.25 MHz, 638 MHz, 656 MHz.
- If you are moving between frequency plans on a common PCB, keeping the same 5.0×5.0mm footprint can reduce layout churn and re-qualification scope.
- For broader family navigation: SAW Filters.
Documents & Downloads
Datasheets
For test setup details (source/load impedance, temperature, and measurement bandwidth), please refer to the official datasheet. If you need qualification reports or additional curves, request them via RFQ.
Frequently Asked Questions (FAQ)
FSF-5050-604M5 is centered at 604.5 MHz (typical 2 dB bandwidth in the 5–8.5 MHz class). FSF-5050-609M9 is centered at 609.9 MHz (typical 3 dB bandwidth in the 5–10 MHz class) and supports a wider temperature grade. Both use a 5.0×5.0mm SMD package and are optimized for 50 Ω IF signal paths.
The series targets 600 MHz-class IF front ends, including professional/private radio, fixed wireless access links, microwave backhaul, measurement instruments and other communication equipment that require high stopband attenuation and controlled passband behavior.
The filters are optimized for 50 Ω systems and can usually be inserted directly into a standard 50 Ω IF signal path. If your system impedance or gain structure is different, reserve simple L-C matching positions so return loss and passband flatness can be fine-tuned during validation.
This is a B2B component and pricing depends on quantity, specification version, and logistics. Share your target part number, annual volume, and project timeline via Contact/RFQ to receive a formal quotation.
MOQ and lead time vary by part number and production schedule. Samples are available for engineering evaluation, and volume supply is supported for qualified designs. Contact us with your requirements to confirm current availability.
Yes. Provide your IF plan, required bandwidth, insertion-loss budget, and stopband/interference environment. We can recommend an equivalent FSF-5050 option or discuss a custom SAW filter design.
Share your system architecture and key requirements (IF frequency, bandwidth, insertion loss and stopband targets, etc.) with FCom Fuji Crystal. We can recommend suitable FSF-5050 series part numbers or plan a custom SAW filter solution tailored to your design.
Certifications: ISO9001 · ISO14001. For application engineering support, include your IF plan, blocker profile, and target selectivity in your message.