Clock Generators

Name	Manufacturer	Pricing(USD)	Quantity	Datasheet	Factory Lead Time	Lifecycle Status	Mount	Packaging	Published	Series	Pbfree Code	Part Status	Moisture Sensitivity Level (MSL)	Number of Terminations	ECCN Code	Max Operating Temperature	Min Operating Temperature	Operating Supply Voltage	Length	RoHS Status	Lead Free	Contact Plating	Radiation Hardening	Number of Pins	Additional Feature	Package / Case	Interface	Max Supply Voltage	REACH SVHC	Reach Compliance Code	Min Supply Voltage	Frequency	Height	Width	Thickness	Mounting Type	Weight	Operating Temperature	Technology	Operating Supply Current	Height Seated (Max)	Number of Functions	Nominal Supply Current	Type	JESD-609 Code	Terminal Finish	Terminal Position	Terminal Form	Peak Reflow Temperature (Cel)	Supply Voltage	Time@Peak Reflow Temperature-Max (s)	Base Part Number	Pin Count	Temperature Grade	Surface Mount	Terminal Pitch	JESD-30 Code	Supply Voltage-Min (Vsup)	Operating Temperature (Max)	Operating Temperature (Min)	Subcategory	Qualification Status	Power Supplies	Supply Voltage-Max (Vsup)	Max Power Dissipation	Number of Elements	Number of Outputs	Number of Circuits	Operating Frequency-Max	Operating Frequency-Min	Operating Frequency	Output	Supply Current-Max (Isup)	Supplier Device Package	Input	Rise Time-Max	Fall Time-Max	Symmetry-Max	Frequency Adjustment-Mechanical	Control Voltage-Max	Output Characteristics	Number of True Outputs	Logic Function	Frequency (Max)	Voltage - Supply	Linearity	uPs/uCs/Peripheral ICs Type	Family	Same Edge Skew-Max (tskwd)	Primary Clock/Crystal Frequency-Nom	Ratio - Input:Output	PLL	Frequency Deviation/Pullability	Differential - Input:Output	Output Clock Frequency-Max	Divider/Multiplier
SI5341B-D07249-GMR	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tape & Reel (TR)				Active	2 (1 Year)	64					9mm	ROHS3 Compliant														9mm					CMOS		0.9mm						QUAD	NO LEAD	260	1.8V	40			INDUSTRIAL	YES	0.5mm	S-XQCC-N64	1.71V	85°C	-40°C				1.89V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			750MHz					350MHz
MK2049-36SITR	Integrated Device Technology (IDT)	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tape & Reel (TR)	1999		no			20	EAR99	85°C	-40°C			Non-RoHS Compliant						SOIC				not_compliant				7.5mm							2.65mm				e0	Tin/Lead (Sn/Pb)	DUAL	GULL WING	NOT SPECIFIED	3.3V	NOT SPECIFIED		20	INDUSTRIAL			R-PDSO-G20				Clock Generators	Not Qualified	3.3V	3.45V				1							LVCMOS									77.76MHz			CLOCK GENERATOR, OTHER			24.704MHz		Yes
271PGILFT	Integrated Device Technology (IDT)	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tape & Reel	1999		yes	Discontinued	1 (Unlimited)	20	EAR99	85°C	-40°C	3.3V	6.5mm	RoHS Compliant	Lead Free		No	20		TSSOP								4.4mm	1mm				CMOS						e3	Matte Tin (Sn) - annealed	DUAL	GULL WING	260	3.3V			20	INDUSTRIAL		0.65mm					Clock Generators			3.465V				1							Crystal									200MHz			CLOCK GENERATOR, OTHER			27MHz
CDCE706PWR	Texas Instruments	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks	ACTIVE (Last Updated: 1 week ago)	Surface Mount	Tape & Reel (TR)			yes	Active	1 (Unlimited)	20	EAR99			3.3V	6.5mm	ROHS3 Compliant	Lead Free	Gold	No	20		20-TSSOP (0.173, 4.40mm Width)	I2C		Unknown			54MHz	1.2mm	4.4mm	1mm	Surface Mount	76.997305mg	-40°C~85°C	BICMOS				90mA	Spread Spectrum Clock Driver	e4		DUAL	GULL WING	260	3.3V		CDCE706	20												600mW	3	6	1				LVCMOS			LVCMOS, Crystal									300MHz	3V~3.6V					200MHz	1:6	Yes with Bypass		Yes/No		Yes/Yes
CDCEL925PWG4	Texas Instruments	4.9706	Add to Cart Min: 1 Mult: 1				Surface Mount						1 (Unlimited)	16	EAR99	85°C	-40°C	1.8V		RoHS Compliant	Lead Free	Gold	No	16		TSSOP		1.9V			1.7V	160MHz		4.4mm			61.887009mg		CMOS				20mA		e4		DUAL	GULL WING	260	1.8V			16	INDUSTRIAL												2	5	1							Crystal								Clock	230MHz						32MHz
ICS672M-01LF	Integrated Device Technology (IDT)	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount		1999		yes		3 (168 Hours)	16		70°C	0°C		9.9mm	RoHS Compliant						SOIC				unknown				3.9mm					CMOS			1			e3	Matte Tin (Sn) - annealed	DUAL	GULL WING	260	3.3V	30		16	COMMERCIAL								Not Qualified	3.3V	5.5V				1							Clock						3-STATE	4		84MHz				672	0.3 ns			Yes
89H16NT2G2ZCHLI8	Renesas Electronics America Inc.	0.0000	RFQ Min: 1 Mult: 1					Tape & Reel (TR)				Obsolete	1 (Unlimited)
650R-01LF	Renesas Electronics America Inc.	0.0000	RFQ Min: 1 Mult: 1	download				Tube				Obsolete	1 (Unlimited)													20-SSOP (0.154, 3.90mm Width)										Surface Mount		0°C~70°C						Clock/Frequency Synthesizer								ICS650-01																1				CMOS		20-QSOP	Clock, Crystal									66.67MHz	3V~5.5V						1:8	Yes with Bypass		No/No		No/No
843001CGI-23LF	Renesas Electronics America Inc.	0.0000	RFQ Min: 1 Mult: 1	download				Tube		FemtoClock®		Obsolete	1 (Unlimited)													24-TSSOP (0.173, 4.40mm Width) Exposed Pad										Surface Mount		-40°C~85°C						Frequency Synthesizer								ICS843001																1				LVCMOS, LVPECL, LVTTL			LVCMOS, LVTTL, Crystal									625MHz	2.375V~3.465V						3:2	Yes		No/Yes		Yes/No
SI5340B-D07770-GM	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tray				Active	2 (1 Year)	44					7mm	ROHS3 Compliant														7mm					CMOS		0.9mm						QUAD	NO LEAD	260	1.8V	40			INDUSTRIAL	YES	0.5mm	S-XQCC-N44	1.71V	85°C	-40°C				1.89V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			750MHz					350MHz
SI5335D-B03189-GM	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tray				Active	2 (1 Year)	24					4mm	RoHS Compliant					ALSO OPERATES AT 2.5V AND 3.3V NOMINAL SUPPLY	24-VFQFN Exposed Pad								4mm		Surface Mount			CMOS		0.9mm				e4	Gold (Au)	QUAD	NO LEAD	260	1.8V	NOT SPECIFIED			INDUSTRIAL	YES	0.5mm	S-XQCC-N24	1.71V	85°C	-40°C				1.98V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			200MHz					200MHz
SI5335A-B04250-GM	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tray				Active	2 (1 Year)	24					4mm	RoHS Compliant					ALSO OPERATES AT 2.5V AND 3.3V NOMINAL SUPPLY	24-VFQFN Exposed Pad				compliant				4mm		Surface Mount			CMOS		0.9mm				e4	Gold (Au)	QUAD	NO LEAD	260	1.8V	NOT SPECIFIED			INDUSTRIAL	YES	0.5mm	S-XQCC-N24	1.71V	85°C	-40°C				1.98V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			27MHz					350MHz
SI5345D-D09265-GMR	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tape & Reel (TR)				Active	2 (1 Year)	64					9mm	ROHS3 Compliant														9mm					CMOS		0.9mm						QUAD	NO LEAD	260	1.8V	40			INDUSTRIAL	YES	0.5mm	S-XQCC-N64	1.71V	85°C	-40°C				1.89V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			750MHz					350MHz
SI5335A-B04390-GMR	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks			Tape & Reel (TR)				Active	2 (1 Year)	24					4mm	RoHS Compliant					ALSO OPERATES AT 2.5V AND 3.3V NOMINAL SUPPLY	24-VFQFN Exposed Pad				compliant				4mm		Surface Mount			CMOS		0.9mm				e4	Gold (Au)	QUAD	NO LEAD	260	1.8V	NOT SPECIFIED			INDUSTRIAL	YES	0.5mm	S-XQCC-N24	1.71V	85°C	-40°C				1.98V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			27MHz					350MHz
8T49N285-999NLGI	Integrated Device Technology (IDT)	0.0000	RFQ Min: 1 Mult: 1	download	17 Weeks		Surface Mount		2014			Active		56		85°C	-40°C	3.3V	8mm	RoHS Compliant	Lead Free	Tin		56	IT ALSO OPERATES AT 3.3V NOMINAL SUPPLY									8mm	850μm				CMOS						e3		QUAD	NO LEAD	260	2.5V	30			INDUSTRIAL		0.5mm								2.625V			8	1							Crystal									1GHz			CLOCK GENERATOR, PROCESSOR SPECIFIC			40MHz
PL602031UMG	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tube				Discontinued	2 (1 Year)			85°C	-40°C			ROHS3 Compliant				16		16-VFQFN Exposed Pad										Surface Mount		-40°C~85°C														PL602031																1				LVCMOS		16-QFN (3x3)	HCSL, Crystal									25MHz	2.25V~3.63V						1:2	Yes		No/Yes		No/Yes
PL602-03SC-R	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks		Surface Mount	Tape & Reel (TR)	2012			Obsolete	1 (Unlimited)							ROHS3 Compliant				8	TRI-STATE; ENABLE/DISABLE FUNCTION; TR	8-SOIC (0.154, 3.90mm Width)										Surface Mount		0°C~70°C							e3	Matte Tin (Sn)				3.3V		PL602																1			48MHz	CMOS			Crystal			55/45%	NO					100MHz	2.97V~3.63V						1:1	Yes		No/No		No/Yes
MC100LVEL38DW	Rochester Electronics, LLC	0.0000	RFQ Min: 1 Mult: 1	download				Tube		100LVEL	no	Obsolete	1 (Unlimited)	20						Non-RoHS Compliant						20-SOIC (0.295, 7.50mm Width)								7.5mm		Surface Mount		-40°C~85°C	ECL		2.65mm	1		Clock Generator	e0	TIN LEAD	DUAL	GULL WING	240	3.3V	30		20		YES		R-PDSO-G20	3V				COMMERCIAL		3.8V				1				ECL			HSTL, NECL, PECL									1.2GHz	3V~3.8V				0.075 ns		1:4	No		Yes/Yes		Yes/No
PL502-04SC-R	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tape & Reel (TR)	2012			Discontinued	3 (168 Hours)							ROHS3 Compliant				8	ENABLE/DISABLE FUNCTION; TR	8-SOIC (0.154, 3.90mm Width)										Surface Mount		0°C~70°C						Voltage Controlled Crystal Oscillator (VCXO)						3.3V		PL502																1	200MHz	96MHz		LVCMOS			Crystal			55/45%	NO	3.3V				200MHz	2.97V~3.63V	10%					1:1	Yes	200 ppm	No/Yes		Yes/Yes
SI5351A-B02550-GM	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1		6 Weeks			Strip				Active	2 (1 Year)							RoHS Compliant						20-VFQFN Exposed Pad										Surface Mount
PL602-22TI-R	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks		Surface Mount	Tape & Reel (TR)	2012			Discontinued	1 (Unlimited)	6	EAR99				2.9mm	ROHS3 Compliant						SOT-23-6										Surface Mount		-40°C~85°C							e3	Matte Tin (Sn) - annealed	DUAL	GULL WING	260	2.5V	40	PL602				0.95mm	R-PDSO-G6											1				LVCMOS			HCSL, Crystal									125MHz	2.25V~3.63V		CLOCK GENERATOR, PROCESSOR SPECIFIC			25MHz	1:1	Yes		No/Yes		No/No
SY89537LMH TR	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download				Tape & Reel (TR)	2000	Precision Edge®		Obsolete	3 (168 Hours)							ROHS3 Compliant						44-VFQFN Exposed Pad, 44-MLF®										Surface Mount		-40°C~85°C						Clock/Frequency Synthesizer								SY89537																1				LVDS, LVPECL		44-MLF® (7x7)	CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal									756MHz	2.375V~3.6V						3:7	Yes		Yes/Yes		Yes/No
PL123-05HSC	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download	6 Weeks		Surface Mount	Tube	2013			Active	3 (168 Hours)	8					4.9mm	ROHS3 Compliant						8-SOIC (0.154, 3.90mm Width)								3.9mm		Surface Mount		0°C~70°C				1	32mA		e3	Matte Tin (Sn) - annealed	DUAL	GULL WING	260	3.3V	40	PL123					R-PDSO-G8	3V						3.6V			5	1							Clock						3-STATE			134MHz	3V~3.6V						1:5	Yes with Bypass		No/No
SI5345A-B04313-GM	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download				Tray				Not For New Designs	2 (1 Year)	64					9mm	ROHS3 Compliant														9mm					CMOS		0.9mm						QUAD	NO LEAD	260	1.8V	30			INDUSTRIAL	YES	0.5mm	S-XQCC-N64	1.71V	85°C	-40°C				1.89V																							CLOCK GENERATOR, PROCESSOR SPECIFIC			750MHz					712.5MHz
PL585-P8-358OC	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tube	2000			Discontinued	1 (Unlimited)							ROHS3 Compliant				16	TRI-STATE; ENABLE/DISABLE FUNCTION; COMPLEMENTARY OUTPUT; TR	16-TSSOP (0.173, 4.40mm Width)										Surface Mount		0°C~70°C												3.3V		PL585																1				LVCMOS, LVDS, LVPECL			Crystal	0.5ns	0.5ns	55/45%	NO	3.3V				133.33MHz	2.97V~3.63V	10%					1:2	Yes		No/No		Yes/Yes
SI5344C-E-GM	Skyworks Solutions, Inc.	0.0000	RFQ Min: 1 Mult: 1
SY89534LHZ	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download				Tray	2000	Precision Edge®		Obsolete	3 (168 Hours)							ROHS3 Compliant						64-TQFP Exposed Pad										Surface Mount		0°C~85°C						Clock/Frequency Synthesizer								SY89534																1				LVPECL		64-TQFP-EP (10x10)	CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL									500MHz	3V~3.6V						1:13	Yes with Bypass		Yes/Yes		Yes/No
ZL30260LDG1	Microchip Technology	0.0000	RFQ Min: 1 Mult: 1	download	8 Weeks	IN PRODUCTION (Last Updated: 2 weeks ago)		Tray	2016			Active	3 (168 Hours)							ROHS3 Compliant						56-VFQFN Exposed Pad										Surface Mount		-40°C~85°C TA						Clock Multiplier, Frequency Synthesizer																								1				CMOS, HCSL, HSTL, LVDS, LVPECL		56-QFN (8x8)	CMOS, Crystal									1.045GHz	1.71V~3.465V						4:6	Yes with Bypass		Yes/Yes		Yes/No
SI5332AC08878-GM3	Silicon Labs	0.0000	RFQ Min: 1 Mult: 1	download				Tray				Not For New Designs	2 (1 Year)							ROHS3 Compliant																													260		40																																				CLOCK GENERATOR, PROCESSOR SPECIFIC
ADF4112BRU	Analog Devices Inc.	0.0000	RFQ Min: 1 Mult: 1	download			Surface Mount	Tube			no	Obsolete	1 (Unlimited)	16				5V	5mm	Non-RoHS Compliant	Contains Lead	Lead, Tin	No	16	6-BIT SWALLOW COUNTER	16-TSSOP (0.173, 4.40mm Width)								4.4mm		Surface Mount		-40°C~85°C	BICMOS	6.5mA		1	7.5mA	Clock/Frequency Synthesizer (RF)	e0		DUAL	GULL WING	240	3V	30	ADF4112	16			0.65mm		2.7V			PLL or Frequency Synthesis Circuits						1					Clock	4mA		CMOS, TTL									3GHz	2.7V~5.5V						2:1	Yes		Yes/No

SI5341B-D07249-GMR Silicon Labs
1.8V Clock Generators 64 Terminals Tape & Reel (TR)

Price: 0.0000
RFQ
MK2049-36SITR Integrated Device Technology (IDT)
3.3V 77.76MHz Clock Generators 20 Pins SOIC 20 Terminals Tape & Reel (TR)

Price: 0.0000
RFQ
271PGILFT Integrated Device Technology (IDT)
3.3V 200MHz Clock Generators 20 Pins TSSOP 20 Terminals Tape & Reel

Price: 0.0000
RFQ
CDCE706PWR Texas Instruments
3.3V Spread Spectrum Clock Driver 300MHz CDCE706 Clock Generators 20 Pins 20-TSSOP (0.173, 4.40mm Width) 20 Terminals Surface Mount 3V~3.6V Tape & Reel (TR)

Price: 0.0000
RFQ
CDCEL925PWG4 Texas Instruments
1.8V 230MHz Clock Generators 16 Pins TSSOP 16 Terminals

Price: 4.9706
RFQ
ICS672M-01LF Integrated Device Technology (IDT)
3.3V 84MHz Clock Generators 16 Pins SOIC 16 Terminals

Price: 0.0000
RFQ
89H16NT2G2ZCHLI8 Renesas Electronics America Inc.
Clock Generators Tape & Reel (TR)

Price: 0.0000
RFQ
650R-01LF Renesas Electronics America Inc.
Clock/Frequency Synthesizer 66.67MHz ICS650-01 Clock Generators 20-SSOP (0.154, 3.90mm Width) Surface Mount 3V~5.5V Tube

Price: 0.0000
RFQ
843001CGI-23LF Renesas Electronics America Inc.
Frequency Synthesizer 625MHz ICS843001 Clock Generators FemtoClock® Series 24-TSSOP (0.173, 4.40mm Width) Exposed Pad Surface Mount 2.375V~3.465V Tube

Price: 0.0000
RFQ
SI5340B-D07770-GM Silicon Labs
1.8V Clock Generators 44 Terminals Tray

Price: 0.0000
RFQ
SI5335D-B03189-GM Silicon Labs
1.8V Clock Generators 24-VFQFN Exposed Pad 24 Terminals Surface Mount Tray

Price: 0.0000
RFQ
SI5335A-B04250-GM Silicon Labs
1.8V Clock Generators 24-VFQFN Exposed Pad 24 Terminals Surface Mount Tray

Price: 0.0000
RFQ
SI5345D-D09265-GMR Silicon Labs
1.8V Clock Generators 64 Terminals Tape & Reel (TR)

Price: 0.0000
RFQ
SI5335A-B04390-GMR Silicon Labs
1.8V Clock Generators 24-VFQFN Exposed Pad 24 Terminals Surface Mount Tape & Reel (TR)

Price: 0.0000
RFQ
8T49N285-999NLGI Integrated Device Technology (IDT)
2.5V 1GHz Clock Generators 56 Terminals

Price: 0.0000
RFQ
PL602031UMG Microchip Technology
25MHz PL602031 Clock Generators 16-VFQFN Exposed Pad Surface Mount 2.25V~3.63V Tube

Price: 0.0000
RFQ
PL602-03SC-R Microchip Technology
3.3V 100MHz PL602 Clock Generators 8-SOIC (0.154, 3.90mm Width) Surface Mount 2.97V~3.63V Tape & Reel (TR)

Price: 0.0000
RFQ
MC100LVEL38DW Rochester Electronics, LLC
3.3V Clock Generator 1.2GHz Clock Generators 100LVEL Series 20 Pins 20-SOIC (0.295, 7.50mm Width) 20 Terminals Surface Mount 3V~3.8V Tube

Price: 0.0000
RFQ
PL502-04SC-R Microchip Technology
3.3V Voltage Controlled Crystal Oscillator (VCXO) 200MHz PL502 Clock Generators 8-SOIC (0.154, 3.90mm Width) Surface Mount 2.97V~3.63V Tape & Reel (TR)

Price: 0.0000
RFQ
SI5351A-B02550-GM Silicon Labs
Clock Generators 20-VFQFN Exposed Pad Surface Mount Strip

Price: 0.0000
RFQ
PL602-22TI-R Microchip Technology
2.5V 125MHz PL602 Clock Generators SOT-23-6 6 Terminals Surface Mount 2.25V~3.63V Tape & Reel (TR)

Price: 0.0000
RFQ
SY89537LMH TR Microchip Technology
Clock/Frequency Synthesizer 756MHz SY89537 Clock Generators Precision Edge® Series 44-VFQFN Exposed Pad, 44-MLF® Surface Mount 2.375V~3.6V Tape & Reel (TR)

Price: 0.0000
RFQ
PL123-05HSC Microchip Technology
3.3V 134MHz PL123 Clock Generators 8-SOIC (0.154, 3.90mm Width) 8 Terminals Surface Mount 3V~3.6V Tube

Price: 0.0000
RFQ
SI5345A-B04313-GM Silicon Labs
1.8V Clock Generators 64 Terminals Tray

Price: 0.0000
RFQ
PL585-P8-358OC Microchip Technology
3.3V 133.33MHz PL585 Clock Generators 16-TSSOP (0.173, 4.40mm Width) Surface Mount 2.97V~3.63V Tube

Price: 0.0000
RFQ
SI5344C-E-GM Skyworks Solutions, Inc.
Clock Synthesizer / Jitter Cleaner Low-jitter, 4-output, any frequency (< 1028 MHz), any output jitter attenuator

Price: 0.0000
RFQ
SY89534LHZ Microchip Technology
Clock/Frequency Synthesizer 500MHz SY89534 Clock Generators Precision Edge? Series 64-TQFP Exposed Pad Surface Mount 3V~3.6V Tray

Price: 0.0000
RFQ
ZL30260LDG1 Microchip Technology
Clock Multiplier, Frequency Synthesizer 1.045GHz Clock Generators 56-VFQFN Exposed Pad Surface Mount 1.71V~3.465V Tray

Price: 0.0000
RFQ
SI5332AC08878-GM3 Silicon Labs
Clock Generators Tray

Price: 0.0000
RFQ
ADF4112BRU Analog Devices Inc.
3V Clock/Frequency Synthesizer (RF) 3GHz ADF4112 Clock Generators 16 Pins 16-TSSOP (0.173, 4.40mm Width) 16 Terminals Surface Mount 2.7V~5.5V Tube

Price: 0.0000
RFQ