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SAW Filters

Image Part Number Description / PDF Quantity Rfq
PX1002

PX1002

RFMi

FILTER,PX,86.850 MHZ,

0
SF2445E

SF2445E

RFMi

FILTER, SAW, 846 MHZ, 8SMD

0
SF2177E-1

SF2177E-1

RFMi

FILTER, SAW, 1472 MHZ, 8SMD

0
SF2330K

SF2330K

RFMi

FILTER, SAW, 1890 MHZ, 5SMD

0
SF2413E

SF2413E

RFMi

FILTER, SAW, 866.5 MHZ, 6SMD

0
RF1396C

RF1396C

RFMi

CRF,SM,434.420MHZ

0
SF2226E

SF2226E

RFMi

FILTER, SAW, 2132.5 MHZ, 6SMD

0
SF2199E

SF2199E

RFMi

FILTER, SAW, 787 MHZ, 6SMD

0
SF2166E

SF2166E

RFMi

FILTER, SAW, 1280.18 MHZ, 8SMD

0
RF3603D

RF3603D

RFMi

CRF,SM,310-319.5 MHZ

0
SF2098E

SF2098E

RFMi

FILTER, SAW, 915 MHZ, 6SMD

0
SF2353E

SF2353E

RFMi

FILTER, SAW, 1582.4 MHZ, 6SMD

0
RF1391C

RF1391C

RFMi

CRF,SM,433.420MHZ

0
SF2081E

SF2081E

RFMi

FILTER, SAW, 1220 MHZ, 8SMD

0
SF1192B

SF1192B

RFMi

FILTER, SAW, 1842.5 MHZ, 6SMD

0
SF2281D

SF2281D

RFMi

FILTER SAW, 313.15/314 MHZ, 8SMD

0
SF2124E

SF2124E

RFMi

FILTER, SAW, 2441.8 MHZ, 6SMD

4923
SF2434E-1

SF2434E-1

RFMi

FILTER, SAW, 1223 MHZ, 6SMD

0
SF1220G

SF1220G

RFMi

FILTER, SAW, 2326 MHZ, 5SMD

0
SF1186H-2

SF1186H-2

RFMi

FILTER, SAW, 1575.42 MHZ, 4SMD

0

SAW Filters

1. Overview

Surface Acoustic Wave (SAW) filters are compact, cost-effective RF filtering components that utilize mechanical waves propagating along the surface of piezoelectric materials. By converting electrical signals to acoustic waves and back, SAW filters achieve precise frequency selection with steep roll-off characteristics. They play a critical role in modern communication systems by enabling spectral efficiency, noise suppression, and signal integrity maintenance in wireless devices, automotive electronics, and industrial equipment.

2. Main Types and Functional Classification

TypeFunctional CharacteristicsApplication Examples
IDT-Structured SAWStandard interdigital transducer design with <3 GHz operating rangeMobile phones, Wi-Fi routers
Dual-Mode SAWHigher Q-factor through resonator coupling5G NR frequency bands (n77/n78)
Temperature-Compensated SAW (TC-SAW) 0.5 ppm/ C stability using layered substratesAutomotive radar (76-81 GHz)
Miniature SAW (M-SAW)0.5-2.0 mm package sizes for IoT devicesBluetooth LE modules, wearables

3. Structure and Composition

Typical SAW filter construction includes:

  • Piezoelectric substrate (LiTaO3, LiNbO3, or quartz)
  • Aluminum interdigital transducer (IDT) electrodes (50-200 nm thickness)
  • Acoustic wave propagation path (10-100 wavelength)
  • Hermetic ceramic packaging with EMI shielding

Advanced variants incorporate temperature compensation layers (SiO2/Ta2O5) and reflector bars to enhance frequency stability and stopband attenuation.

4. Key Technical Specifications

ParameterDescriptionImportance
Center Frequency (f0)100 MHz - 6 GHz rangeDetermines application compatibility
Bandwidth (BW)0.5-15% of f0Impacts data rate capabilities
Insertion Loss1.5-15 dBAffects signal strength
Attenuation Slope10-100 dB/MHzMeasures selectivity performance
Power Handling100 mW - 5 WLimits transmitter integration
Temperature Stability 50 ppm/ C (standard)System reliability factor

5. Application Fields

  • Telecommunications: 5G base stations, CATV systems, GPS receivers
  • Automotive: Tire pressure monitoring systems (TPMS), V2X communication
  • Consumer Electronics: Smartphones, IoT modules, drones
  • Industrial: Medical imaging equipment, test & measurement instruments

6. Leading Manufacturers and Products

ManufacturerRepresentative ProductKey Features
Murata ManufacturingSAWF9BAF420M4A12.4 GHz WLAN filter, 0.9 dB loss
TDK CorporationKC5030S108MB1Sub-6 GHz 5G filter, 1.2 dB insertion loss
Skyworks SolutionsSAW-8851417Multi-band cellular filter, 1.8-2.7 GHz
Infineon TechnologiesB11243-F108Automotive-grade TC-SAW for 80 GHz radar

7. Selection Recommendations

Key selection criteria:

  1. Frequency match with < 0.1% tolerance
  2. Temperature stability grade (standard vs TC-SAW)
  3. Package size vs power handling requirements
  4. Attenuation slope for adjacent channel rejection
  5. RoHS compliance for environmental regulations

Example: For LTE Band 7 (2.6 GHz) applications, select TDK's KC5030S108MB1 with 110 MHz bandwidth and 1.2 dB loss in 0.5x0.5 mm package.

8. Industry Trends

  • Transition to 5G driving demand for 3-6 GHz SAW filters
  • Development of hybrid SAW-BAW modules for wideband applications
  • Miniaturization reaching 0.4x0.2 mm WLB packages
  • Advanced TC-SAW achieving < 10 ppm/ C stability
  • Integration with antenna switch modules (ASM) in SiP solutions
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