FSF-5050-149M64 — 149.64 MHz IF SAW Bandpass Filter

Designed for mixer/IF chains that require robust selectivity with controlled ripple and group-delay behavior in a compact SM5050-8 (5.0×5.0mm) footprint. Use it when your IF plan targets ~150 MHz and needs a broad passband window for wideband receiver architectures.

Fc 149.64 MHz Passband 121.70–176.10 MHz BW ~54.40 MHz Package SM5050-8 5.0×5.0 mm Type IF Bandpass SAW

Target systems/standards Typical IF placement Key specs table Matching & impedance Selection guidance Internal links FAQ Downloads

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Family hub: FSF-5050 IF SAW Filters. Knowledge hub: SAW Filter Knowledge Hub.

Target systems & standards (examples)

FSF-5050-149M64 is typically selected when an IF plan centers around ~150 MHz and needs a broad passband window. Representative use cases include:

Private LTE/5G receiver IF chains (post-mixer IF select / spur suppression)
Land mobile / professional radio multi-mode platforms with wide IF coverage needs
Backhaul / microwave intermediate-frequency modules requiring stable selectivity
Test & measurement IF filtering where repeatable passband shape is required

Exact applicability depends on your IF planning, image frequencies, LO spurs, and the required stopband masks for your architecture.

Why a wideband IF SAW filter here?

Reduces out-of-band noise loading into IF gain stages
Improves image/spur suppression vs. simple LC filtering
Provides controlled ripple for modulation/EVM stability
Controls group delay behavior to reduce time-domain distortion

Typical IF placement in receiver architecture

In a common superheterodyne or low-IF chain, FSF-5050-149M64 is deployed after the mixer to shape the desired IF spectrum and suppress images/LO spurs before high-gain IF amplification and ADC. In some designs, it is used after an IF LNA as the primary selectivity element to control noise and linearity tradeoffs.

Post-mixer IF select: defines the IF passband for subsequent IF gain/ADC stages
Image/spur suppression: attenuates mixer products outside the IF window
Anti-alias support: reduces out-of-band energy prior to sampling (system dependent)

Key electrical specifications

Typical values depend on reference impedance and matching conditions; correlate in your real source/load environment for best accuracy.

Model	FSF-5050-149M64
Filter type	IF wideband SAW bandpass filter
Nominal center frequency (Fc)	149.64 MHz
Passband	121.70–176.10 MHz
Bandwidth	~54.40 MHz (176.10 − 121.70)
Insertion loss (IL)	Datasheet-dependent (validate with your real source/load impedance and matching network)
Passband ripple	Datasheet-dependent; ripple sensitivity is system-driven (EVM, adjacent-channel requirements, AGC strategy)
Stopband / rejection	Define by your image/spur plan and verify against the latest datasheet stopband mask (frequency offsets, attenuation levels, and measurement impedance must match your conditions)
Group delay	Controlled group-delay behavior for IF integrity; verify group-delay ripple vs. your modulation bandwidth (important for time-domain distortion and EVM)
Package	SM5050-8 (5.0×5.0 mm)

Practical engineering note: SAW filters are often specified under a reference impedance. If your IF chain is not 50 Ω end-to-end, measure IL/ripple in a fixture that reflects the real source/load to avoid correlation errors.

Impedance & matching guidance (50 Ω vs high-impedance)

FSF-5050 platform pages commonly support both 50 Ω and high-impedance integration approaches. Selecting the right impedance definition reduces tuning risk and improves repeatability.

Choose 50 Ω when your IF chain and test flow are standardized to 50 Ω and you want predictable correlation between bench and system measurements.
Choose high-impedance when the SAW is integrated directly around active IF stages, and matching is optimized for gain/NF/linearity rather than a strict 50 Ω interface.

Matching recommendation

Follow the reference evaluation network first (often π/T matching)
Keep matching close to the package; minimize series inductance
Validate IL/ripple using your real source/load impedance
Confirm stopband in the assembled RF/IF environment (spurs + LO feedthrough)

How to choose nearby variants in the FSF-5050 line-up

Use FSF-5050-149M64 when your IF plan targets ~150 MHz and requires a wide passband window. If you are choosing between adjacent variants, apply a consistent selection rule:

IF planning first: pick Fc closest to your nominal IF; ensure passband fully covers your occupied bandwidth + guard
Rejection first: if image/spur mask is tight, consider a narrower-band or higher-attenuation option
Ripple/EVM first: choose the option with ripple/gd-ripple behavior aligned to your modulation and equalization strategy
Impedance first: match the variant to your chain (50 Ω vs high-impedance) to reduce tuning iterations

Nearby FSF-5050 pages

Internal links (family, application, knowledge)

Product family

FSF-5050 IF SAW Filters (Family Hub)

Most relevant reading

These links are selected to support selection, matching correlation, and layout/ESD risk reduction for IF SAW filters.

Documents & downloads

FSF-5050-149M64 IF SAW bandpass filter package outline (SM5050-8)

Platform / package reference: SM5050-8 (5.0×5.0 mm) is the standardized footprint used across the FSF-5050 IF SAW filter family to simplify qualification, sourcing, and production change control.

Datasheet — FSF-5050-149M64 (PDF): Download PDF

Quality & compliance: ISO9001, ISO14001

For full stopband masks, group-delay curves, matching BOM/Gerber, or optional compliance documents, please use the inquiry form and include your system standard, target bandwidth, and interface impedance.

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FAQ

What is FSF-5050-149M64 used for in an IF chain?

FSF-5050-149M64 is an IF wideband SAW bandpass filter typically placed after the mixer (or after an IF LNA) to provide channel selectivity and image/spur suppression. Its wide passband (121.70–176.10 MHz) supports IF plans requiring broad coverage while maintaining controlled ripple and group-delay behavior.

What are the key searchable specs of FSF-5050-149M64?

Nominal center frequency is 149.64 MHz. Passband is 121.70–176.10 MHz (about 54.40 MHz bandwidth). Package is SM5050-8 (5.0×5.0 mm). For insertion loss, ripple, stopband attenuation, and group delay, verify against the latest datasheet and your impedance/matching network.

50 Ω vs high-impedance: which should I choose and how should I match it?

Use a 50 Ω variant when the IF chain is standardized to 50 Ω and you want predictable measurement correlation. Use a high-impedance variant when integrating directly with active IF stages where power, gain and noise figure optimization benefit from non-50 Ω terminations. In both cases, follow the reference evaluation network (often π/T matching) and validate IL/ripple with your real source/load impedance.

How do I choose between FSF-5050-149M64 and nearby variants?

Start from your IF plan: choose the Fc closest to your nominal IF and ensure the passband fully covers your modulation bandwidth plus guard. If your priority is tighter rejection, select a narrower-band or higher-attenuation adjacent option; if you need wider coverage, keep the wideband variant. Compare impedance definition and stopband targets across nearby pages before finalizing.

Why is there no price shown on the product page?

SAW filters are typically supplied on a B2B RFQ basis. Pricing depends on target frequency plan, impedance option, qualification scope, order volume, packaging and lead time. Send your requirements to Fcom@fujicrystal.com for a fast quotation.

Do you provide samples and application engineering support?

Yes. We support samples and engineering selection guidance (IF/LO plan, image/spur mask, matching approach and layout tips). Contact Fcom@fujicrystal.com and share your target passband, stopband points and impedance constraints.

What are typical MOQ and lead time?

MOQ and lead time depend on the exact variant, screening/test requirements and order volume. Contact sales with your annual demand, target delivery schedule and qualification needs for the most accurate lead time and MOQ.

Can you customize center frequency, bandwidth or impedance definition?

Customization is available for projects that require specific center frequency, bandwidth/window, impedance definition or screening. Provide your RF/IF plan and required stopband mask, and we will evaluate feasibility and recommend the closest standard or custom solution.

Do you provide test data such as S-parameters or measurement reports?

Datasheets provide the reference specifications and typical performance. If your project requires correlation under specific source/load impedance or fixture conditions, we can advise on measurement setup and, when applicable, provide supporting test information during evaluation.

Need help with IF planning or the stopband mask for your image/spur map? Share your IF/LO plan and target masks, and we can suggest the closest FSF-5050 frequency option and matching approach.