SAW Filters

Image	Part Number	Description / PDF	Quantity	Rfq
	B39232B9490P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 2.345GHZ 5SMD	0
	B39881B8568P810 RF360 - A Qualcomm-TDK joint venture	SAW FILTER	0
	B39361B4847U310W3 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 360MHZ 8SMD	0
	B39438X6964N201 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 43.75MHZ 5SIP	0
	B39202B9502L310 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.843/1.96GHZ 10SMD	0
	B39182B7714C610 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.843GHZ 6SMD	0
	B39458M4952M100S1 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 45.75MHZ 5SIP	0
	B39202B8607P810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.88GHZ 8SMD	0
	B39381B3825H310 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 380MHZ 10SMD	0
	B39211B3646Z710 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 208MHZ 10SMD	0
	B39202B9821P810 RF360 - A Qualcomm-TDK joint venture	SAW FILTER	0
	B39431B3757U310 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 434.42MHZ 8SMD	0
	B39202B4170U510 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.96GHZ 6SMD	0
	B39142B1675B510 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.42GHZ 8SMD	0
	B39192B8837P810 RF360 - A Qualcomm-TDK joint venture	SAW FILTER	0
	B39202B4168U410 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 1.96GHZ 6SMD	0
	B39461B5075Z810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 456MHZ 8SMD	0
	B39921B3705Z810 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 914.7MHZ 8SMD	0
	B39438X6964M100S1 RF360 - A Qualcomm-TDK joint venture	FILTER SAW 43.75MHZ 5SIP	0
	B39881B9844P810 RF360 - A Qualcomm-TDK joint venture	SAW FILTER	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