SAW Filters

Part Number	Description / PDF	Quantity
B39941B3512U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 942.5MHZ 6SMD	0
B39871B3725U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 869MHZ 6SMD	24759
B39941B4323P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 942.5MHZ 5SMD	0
B39162B8666L210 RF360 - A Qualcomm-TDK joint venture	CSSP3 DPLX GT	4206
B39242B8831P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 2.442GHZ 6SMD	4576
B39232B3927U510 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 6SMD	0
B39162B3520U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.575GHZ 6SMD	221
B39931B3916U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 6SMD	0
B39321B3783Z810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 315MHZ 8SMD	0
B39162B4300F210 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.575GHZ 5SMD	0
B39152B1664U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.47GHZ 6SMD	0
B39921B2671P810 RF360 - A Qualcomm-TDK joint venture	CSSP3 GT	2205
B39311B3729H110 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 313.85MHZ 6SMD	0
B39431B3736H110 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 433.92MHZ 6SMD	1910
B39431B3727H110 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 433.92MHZ 6SMD	0
B39401B3742H110 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 400MHZ 6SMD	1892
B39431B5055Z810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 425MHZ 8SMD	0
B39431B3532A410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 8SMD	0
B39242B4346P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 2.442GHZ 5SMD	3969
B39162B8828P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.58247GHZ 5SMD	3874

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