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SAW Filters

Image Part Number Description / PDF Quantity Rfq
SF2208E

SF2208E

RFMi

FILTER, SAW, 1227 MHZ, 6SMD

0
SF1184B-1

SF1184B-1

RFMi

FILTER, SAW, 947.5 MHZ, 6SMD

0
SF2190B

SF2190B

RFMi

FILTER, SAW, 138 MHZ, 10SMD

0
SF2038C-1

SF2038C-1

RFMi

FILTER, SAW, 76.5 MHZ, 8SMD

0
RF3501E

RF3501E

RFMi

CRF,SM,866.000 MHZ

0
SF2137E-1

SF2137E-1

RFMi

FILTER, SAW, 869 MHZ, 6SMD

0
RF3625E

RF3625E

RFMi

CRF,SM,434.420MHZ

0
RF1415D

RF1415D

RFMi

CRF,SM,315.000 MHZ

0
SF2026B

SF2026B

RFMi

FILTER, SAW, 114.815 MHZ, 10SMD

0
RF3609D

RF3609D

RFMi

CRF,SM,450.000 MHZ

0
SF1140B

SF1140B

RFMi

FILTER, SAW, 75 MHZ, 10SMD

0
RF1353D

RF1353D

RFMi

CRF,SM,345.000 MHZ

0
SF2467H

SF2467H

RFMi

FILTER, SAW, 1542 MHZ, 4SMD

0
SF2133E-3

SF2133E-3

RFMi

FILTER, SAW, 1747.5 MHZ, 6SMD

0
SF2275E

SF2275E

RFMi

FILTER, SAW, 1542.5 MHZ, 6SMD

0
SF2126E

SF2126E

RFMi

FILTER, SAW,725 MHZ, 8SMD

7345
SF2237C

SF2237C

RFMi

FILTER, SAW, 515 MHZ, 8SMD

0
SF2158E

SF2158E

RFMi

FILTER, SAW, 2535 MHZ, 6SMD

0
SF2063A

SF2063A

RFMi

FILTER, SAW, 156 MHZ, 12SMD

0
SF2240E

SF2240E

RFMi

FILTER, SAW, 2595 MHZ, 6SMD

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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