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SAW Filters

Image Part Number Description / PDF Quantity Rfq
SF2001E

SF2001E

RFMi

FILTER, SAW, 1960 MHZ, 6SMD

0
SF2038B-3

SF2038B-3

RFMi

FILTER, SAW, 76.5 MHZ, 12SMD

0
SF1088A

SF1088A

RFMi

FILTER, SAW, 170.6 MHZ, 10SMD

0
B39751B4318P810

B39751B4318P810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 751MHZ 5SMD

0
SF2412E

SF2412E

RFMi

FILTER, SAW, 925 MHZ, 6SMD

0
B39711B5107U410

B39711B5107U410

RF360 - A Qualcomm-TDK joint venture

RF DIPLEXER 393.5/1848MHZ 6SMD

2302
RF3336D

RF3336D

RFMi

CRF,SM,868.350 MHZ

0
AFS303.825E

AFS303.825E

Abracon

FILTER SAW 303.825MHZ 8SMD

0
B39431B3775Z810

B39431B3775Z810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 433.92MHZ 8SMD

0
SF2177E

SF2177E

RFMi

FILTER, SAW, 1472 MHZ, 8SMD

0
SF2085A

SF2085A

RFMi

FILTER, SAW, 96 MHZ, 10SMD

0
RF3417E-1

RF3417E-1

RFMi

CRF,SM,315.000 MHZ

0
SF2182D

SF2182D

RFMi

FILTER, SAW, 140 MHZ, 8SMD

0
SF2038B-2

SF2038B-2

RFMi

FILTER, SAW, 76.5 MHZ, 10SMD

0
RF3417D

RF3417D

RFMi

CRF,SM,315.000 MHZ

0
B39471B5052Z810

B39471B5052Z810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 465MHZ 8SMD

0
B39901B3934H110

B39901B3934H110

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 902.875MHZ 6SMD

0
SF2200E

SF2200E

RFMi

FILTER, SAW, 707 MHZ, 6SMD

0
SF2208E

SF2208E

RFMi

FILTER, SAW, 1227 MHZ, 6SMD

0
F6BG1G582R6TT-J

F6BG1G582R6TT-J

TAIYO YUDEN

FILTER SAW 1.582GHZ 5SMD

5241

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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