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SAW Filters

Image Part Number Description / PDF Quantity Rfq
B39202B3668U410

B39202B3668U410

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 1.95GHZ 6SMD

0
SF2136E

SF2136E

RFMi

FILTER, SAW, 433.92 MHZ, 6SMD

0
B39202B4309P810

B39202B4309P810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 1.95GHZ 5SMD

0
SF2093E

SF2093E

RFMi

FILTER, SAW, 915 MHZ, 8SMD

0
RF1391C-1

RF1391C-1

RFMi

CRF,SM,433.420MHZ

0
SF2416D

SF2416D

RFMi

FILTER, SAW, 490 MHZ, 8SMD

0
SF1115A

SF1115A

RFMi

FILTER, SAW, 199 MHZ, 10SMD

0
B39941B5057U410

B39941B5057U410

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 940.5MHZ 6SMD

0
AFS14A11-722.00-T3

AFS14A11-722.00-T3

Abracon

FILTER SAW 722MHZ 5SMD

0
B39881B4324P810

B39881B4324P810

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 878MHZ 5SMD

0
SF2304B

SF2304B

RFMi

FILTER, SAW, 175 MHZ, 10SMD

0
SF2145B

SF2145B

RFMi

FILTER, SAW, 895 MHZ, 10SMD

0
SF2137E-2

SF2137E-2

RFMi

FILTER, SAW, 869 MHZ, 6SMD

0
F5QA782M0M2AZ-J

F5QA782M0M2AZ-J

TAIYO YUDEN

FILTER SAW 5SMD

4265
B39232B1644U510

B39232B1644U510

RF360 - A Qualcomm-TDK joint venture

FILTER SAW 2338.75MHZ 6SMD

0
SF2024D

SF2024D

RFMi

FILTER, SAW, 467.751 MHZ, 8SMD

0
SF2259H

SF2259H

RFMi

FILTER, SAW, 921.5 MHZ, 4SMD

0
RSF-915.000-26000-3030-TR-NS3

RSF-915.000-26000-3030-TR-NS3

Raltron

FILTER SAW 915MHZ 6SMD

1
F6KA2G436A4VE-Z

F6KA2G436A4VE-Z

TAIYO YUDEN

FILTER SAW 2.436GHZ 5SMD

0
AFS418S3

AFS418S3

Abracon

FILTER SAW 418MHZ 6SMD

295

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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