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SAW Filters

Image Part Number Description / PDF Quantity Rfq
B39162B4310P810

B39162B4310P810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 1.589GHZ 5SMD

484
RF3626E

RF3626E

RFMi

CRF,SM,315.000 MHZ

0
B39321B3761Z810

B39321B3761Z810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 315MHZ 8SMD

1716
F5QA773M0M2QC-J

F5QA773M0M2QC-J

TAIYO YUDEN

FILTER SAW 773MHZ 5SMD

3720
RF3702D

RF3702D

RFMi

CRF,SM,426.440 MHZ

0
RF3355C

RF3355C

RFMi

CRF,SM,390.000 MHZ

0
SF2181D

SF2181D

RFMi

FILTER, SAW, 140 MHZ, 8SMD

0
SF2261E

SF2261E

RFMi

FILTER, SAW, 880 MHZ, 6SMD

0
FAR-F6KA-1G8425-D4CK-Z

FAR-F6KA-1G8425-D4CK-Z

TAIYO YUDEN

FILTER SAW 1.843GHZ 5SMD

0
SF2248E-1

SF2248E-1

RFMi

FILTER, SAW, 314.45 MHZ, 6SMD

0
RSF-915.000-26000-1411-TR

RSF-915.000-26000-1411-TR

Raltron

FILTER SAW 915MHZ 5SMD

1000
SF2002B-2

SF2002B-2

RFMi

FILTER, SAW, 942.5 MHZ, 6SMD

0
RF3404E

RF3404E

RFMi

CRF,SM,433.920 MHZ

0
F6QA1G950M2AA-J

F6QA1G950M2AA-J

TAIYO YUDEN

FILTER SAW 1.95GHZ 5SMD

8732
RF3607D

RF3607D

RFMi

CRF,SM,402-407 MHZ

0
SF2025B

SF2025B

RFMi

FILTER, SAW, 259.861 MHZ, 10SMD

0
F5QA737M5M2QN-J

F5QA737M5M2QN-J

TAIYO YUDEN

FILTER SAW 737.5MHZ 5SMD

4271
RF1404D

RF1404D

RFMi

CRF,SM,433.920 MHZ

0
SF1186B-3

SF1186B-3

RFMi

FILTER, SAW, 1575.42 MHZ, 6SMD

0
SF2314E

SF2314E

RFMi

FILTER, SAW, 866.5 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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