SAW Filters

Image	Part Number	Description / PDF	Quantity	Rfq
	B39202B9815P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.9/2.0175GHZ 10SMD	0
	B39182B9521P810 RF360 - A Qualcomm-TDK joint venture	RF DIPLEX 942.5MHZ/1.8425GHZ SMD	0
	B39192B9483P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 5SMD	0
	B39820B3666Z710 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 82.2MHZ 10SMD	0
	B39431B3960B210 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 433.92MHZ 6SMD	0
	B39241B3655U210 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 248.6MHZ 10SMD	0
	B39451B3554U310 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 447.725MHZ 8SMD	0
	B39941B7705B610 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 942.5MHZ 5SMD	0
	B39941B4121U510 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 942.5MHZ 6SMD	0
	B39941B7675P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 897.5/ 942.5MHZ 9SMD	0
	B39431B3750U310 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 433.92MHZ 8SMD	0
	B39331B3807U310W3 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 326.4MHZ 8SMD	0
	B39171B3881Z710W3 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 168.96MHZ 10SMD	0
	B39162B3529U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.6015GHZ 6SMD	0
	B39202B5310U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW RF	0
	B39362X6967M100 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 36.17MHZ 5SIP	0
	B39212B9411K610S5 RF360 - A Qualcomm-TDK joint venture	SAW FILTER	0
	B39212B7750C810S9 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 2.14GHZ 4SMD	0
	B39791B5317U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW BANDPASS SMD	0
	B39162B5153U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW BANDPASS SMD	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

Type	Functional Characteristics	Application Examples
IDT-Structured SAW	Standard interdigital transducer design with <3 GHz operating range	Mobile phones, Wi-Fi routers
Dual-Mode SAW	Higher Q-factor through resonator coupling	5G NR frequency bands (n77/n78)
Temperature-Compensated SAW (TC-SAW)	0.5 ppm/ C stability using layered substrates	Automotive radar (76-81 GHz)
Miniature SAW (M-SAW)	0.5-2.0 mm package sizes for IoT devices	Bluetooth 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

Parameter	Description	Importance
Center Frequency (f0)	100 MHz - 6 GHz range	Determines application compatibility
Bandwidth (BW)	0.5-15% of f0	Impacts data rate capabilities
Insertion Loss	1.5-15 dB	Affects signal strength
Attenuation Slope	10-100 dB/MHz	Measures selectivity performance
Power Handling	100 mW - 5 W	Limits 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

Manufacturer	Representative Product	Key Features
Murata Manufacturing	SAWF9BAF420M4A1	2.4 GHz WLAN filter, 0.9 dB loss
TDK Corporation	KC5030S108MB1	Sub-6 GHz 5G filter, 1.2 dB insertion loss
Skyworks Solutions	SAW-8851417	Multi-band cellular filter, 1.8-2.7 GHz
Infineon Technologies	B11243-F108	Automotive-grade TC-SAW for 80 GHz radar

7. Selection Recommendations

Key selection criteria:

Frequency match with < 0.1% tolerance
Temperature stability grade (standard vs TC-SAW)
Package size vs power handling requirements
Attenuation slope for adjacent channel rejection
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