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SAW Filters

Image Part Number Description / PDF Quantity Rfq
SF2349D

SF2349D

RFMi

FILTER, SAW, 912.1 MHZ, 6SMD

0
SF2368E

SF2368E

RFMi

FILTER, SAW, 831.5 MHZ, 6SMD

0
SF2276D-2

SF2276D-2

RFMi

FILTER, SAW, 453.75 MHZ, 6SMD

0
RF3604D

RF3604D

RFMi

CRF,SM,345.000 MHZ

0
SF2421D

SF2421D

RFMi

FILTER, SAW, 485 MHZ, 8SMD

0
SF1224E-1

SF1224E-1

RFMi

FILTER, SAW, 2326 MHZ, 6SMD

0
SF2370H

SF2370H

RFMi

FILTER, SAW, 869.225 MHZ, 4SMD

0
SF2098H

SF2098H

RFMi

FILTER, SAW, 915 MHZ, 4SMD

0
SF2463H

SF2463H

RFMi

FILTER, SAW, 1582.4 MHZ, 4SMD

0
SF2204E-1

SF2204E-1

RFMi

FILTER, SAW, 1900 MHZ, 6SMD

0
SF2316E-1

SF2316E-1

RFMi

FILTER, SAW, 1582 MHZ, 6SMD

0
RF3404D

RF3404D

RFMi

CRF,SM,433.920 MHZ

0
SF2049E-1

SF2049E-1

RFMi

FILTER, SAW, 915 MHZ, 6SMD

0
SF2198E

SF2198E

RFMi

FILTER, SAW, 806 MHZ, 6SMD

0
SF1145B

SF1145B

RFMi

FILTER, SAW, 427.25 MHZ, 10SMD

0
RF1408D

RF1408D

RFMi

CRF,SM,447.700 MHZ

0
SF2138B-1

SF2138B-1

RFMi

FILTER, SAW, 144.132 MHZ, 10SMD

0
SF2391E

SF2391E

RFMi

FILTER, SAW, 897.5 MHZ, 6SMD

0
SF2381E

SF2381E

RFMi

FILTER, SAW, 2492 MHZ, 6SMD

0
SF2283D

SF2283D

RFMi

FILTER SAW 433.2/434.64 MHZ 8SMD

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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