
Items : %s%s
Crystals
Compare | Image | Name | Manufacturer | Pricing(USD) | Quantity | Weight(Kg) | Size(LxWxH) | Datasheet | Factory Lead Time | Mount | Material | Packaging | Published | Series | Pbfree Code | Part Status | Moisture Sensitivity Level (MSL) | ECCN Code | Max Operating Temperature | Min Operating Temperature | Depth | Length | RoHS Status | Lead Free | Number of Pins | Additional Feature | Package / Case | REACH SVHC | Reach Compliance Code | Frequency | Height | Width | Mounting Type | Operating Temperature | Size / Dimension | Operating Mode | Height Seated (Max) | HTS Code | Physical Dimension | Type | JESD-609 Code | Terminal Finish | Pin Count | Surface Mount | Operating Temperature (Max) | Operating Temperature (Min) | Mounting Feature | ESR (Equivalent Series Resistance) | Frequency Stability | Load Capacitance | Operating Frequency | Drive Level | Aging | Crystal/Resonator Type | Frequency Tolerance | Accuracy |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
CX3225SB24000D0PESZZ | AVX Corporation | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | 70°C | -10°C | 2.5mm | 3.2mm | RoHS Compliant | Lead Free | 4 | CSMD | 24MHz | 100Ohm | 8pF | ||||||||||||||||||||||||||||||||||||||||
![]() |
EA2025RA10-16.000MTR | Ecliptek | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Ceramic | EAR99 | 2.5mm | Non-RoHS Compliant | Lead Free | 4 | AT-CUT; TR, 13 INCH | 16MHz | 2mm | e4 | Nickel/Gold (Ni/Au) | YES | 70°C | SURFACE MOUNT | 100Ohm | 10pF | 16MHz | 100 µW | 3 PPM/YEAR | PARALLEL - FUNDAMENTAL | 0.001% | |||||||||||||||||||||||||||||
![]() |
FL4000157Z | Diodes Incorporated | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 15 Weeks | Surface Mount | Tape & Reel (TR) | SaRonix-eCera™ FL | yes | Active | 1 (Unlimited) | RoHS Compliant | AT-CUT; TR, 7 INCH | 4-SMD, No Lead | 40MHz | 762μm | Surface Mount | -20°C~85°C | 0.126Lx0.098W 3.20mmx2.50mm | Fundamental | 0.030 0.75mm | 8541.60.00.60 | L3.2XB2.5XH0.65 (mm)/L0.126XB0.098XH0.026 (inch) | MHz Crystal | 40Ohm | ±10ppm | 15pF | 40MHz | 10 μW | ±7ppm | ||||||||||||||||||||||||
![]() |
416F40635CST | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Tape & Reel (TR) | 2015 | 416 | Discontinued | 1 (Unlimited) | ROHS3 Compliant | 4-SMD, No Lead | 40.61MHz | Surface Mount | -20°C~70°C | 0.063Lx0.047W 1.60mmx1.20mm | Fundamental | 0.018 0.45mm | MHz Crystal | 60Ohm | ±50ppm | Series | ±30ppm | ||||||||||||||||||||||||||||||||
![]() |
445A35C30M00000 | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 12 Weeks | Tape & Reel (TR) | 2013 | 445 | Active | 1 (Unlimited) | RoHS Compliant | 2-SMD, No Lead | 30MHz | Surface Mount | -10°C~60°C | 0.197Lx0.126W 5.00mmx3.20mm | Fundamental | 0.053 1.35mm | MHz Crystal | 30Ohms | ±50ppm | 16pF | ±30ppm | |||||||||||||||||||||||||||||||
![]() |
GLA67F23CDT | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 12 Weeks | Tape & Reel (TR) | 2012 | ATSSMGL | yes | Active | 1 (Unlimited) | RoHS Compliant | AT-CUT; TR, 13 INCH | HC-49/US | 6.7458MHz | Surface Mount | -20°C~70°C | 0.461Lx0.197W 11.70mmx5.00mm | Fundamental | 0.169 4.30mm | 8541.60.00.50 | L11.7XB5.0XH4.3 (mm)/L0.461XB0.197XH0.169 (inch) | MHz Crystal | e1 | Tin/Silver/Copper (Sn/Ag/Cu) | YES | 80Ohm | ±30ppm | 18pF | 6.7458MHz | 100 µW | ±20ppm | ||||||||||||||||||||||
![]() |
416F44023CLR | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 14 Weeks | Tape & Reel (TR) | 2015 | 416 | yes | Active | 1 (Unlimited) | ROHS3 Compliant | AT-CUT; TR, 7 INCH | 4-SMD, No Lead | 44MHz | Surface Mount | -20°C~70°C | 0.063Lx0.047W 1.60mmx1.20mm | Fundamental | 0.018 0.45mm | 8541.60.00.60 | L1.6XB1.2XH0.35 (mm)/L0.063XB0.047XH0.014 (inch) | MHz Crystal | e4 | Gold (Au) - with Nickel (Ni) barrier | YES | 60Ohm | ±30ppm | 12pF | 44MHz | 10 µW | ±20ppm | ||||||||||||||||||||||
![]() |
416F270X2CKT | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Tape & Reel (TR) | 2015 | 416 | Discontinued | 1 (Unlimited) | ROHS3 Compliant | AT-CUT; TR, 7 INCH | 4-SMD, No Lead | 27MHz | Surface Mount | -20°C~70°C | 0.063Lx0.047W 1.60mmx1.20mm | Fundamental | 0.018 0.45mm | L1.6XB1.2XH0.35 (mm)/L0.063XB0.047XH0.014 (inch) | MHz Crystal | e4 | GOLD FLASH OVER NICKEL | YES | 120Ohm | ±20ppm | 8pF | 27MHz | 10 µW | ±15ppm | |||||||||||||||||||||||||
![]() |
LFXTAL062001BULK | IQD Frequency Products | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Bulk | Obsolete | RoHS Compliant | Crystal | 2 | |||||||||||||||||||||||||||||||||||||||||||||
![]() |
RT2012-32.768-12.5-EXT-TR | Raltron Electronics | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | 8 Weeks | Tape & Reel (TR) | RT2012 | Active | 1 (Unlimited) | ROHS3 Compliant | 2-SMD, No Lead | 32.768kHz | Surface Mount | -40°C~85°C | 0.079Lx0.047W 2.00mmx1.20mm | Fundamental | 0.024 0.60mm | kHz Crystal (Tuning Fork) | 90kOhm | 12.5pF | ±50ppm | ||||||||||||||||||||||||||||||||||
![]() |
ABM8W-19.9680MHZ-8-D1X-T3 | Abracon LLC | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 13 Weeks | Tape & Reel (TR) | ABM8W | yes | Active | Not Applicable | RoHS Compliant | TR, 7 INCH | 4-SMD, No Lead | 19.968MHz | Surface Mount | -40°C~85°C | 0.126Lx0.098W 3.20mmx2.50mm | Fundamental | 0.030 0.75mm | L3.2XB2.5XH0.75 (mm)/L0.126XB0.098XH0.03 (inch) | MHz Crystal | e4 | Gold (Au) - with Nickel (Ni) barrier | YES | 70Ohm | ±20ppm | 8pF | 19.968MHz | 10 µW | ±10ppm | ||||||||||||||||||||||||
![]() |
F92700044 | Diodes Incorporated | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 17 Weeks | Tape & Reel (TR) | SaRonix-eCera™ F9 | Active | 1 (Unlimited) | RoHS Compliant | AT-CUT; TR | 27MHz | -20°C~70°C | Fundamental | 8541.60.00.60 | L5.0XB3.2XH1.2 (mm)/L0.197XB0.126XH0.047 (inch) | MHz Crystal | YES | SURFACE MOUNT | 50Ohm | ±30ppm | 12pF | 27MHz | 10 µW | ||||||||||||||||||||||||||||||
![]() |
EA3250PA12-25.000MTR | Ecliptek | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | Ceramic | EAR99 | 5mm | Non-RoHS Compliant | Lead Free | 4 | 25MHz | 3.2mm | L5.0XB3.2XH1.0 (mm)/L0.197XB0.126XH0.039 (inch) | e4 | Nickel/Gold (Ni/Au) | YES | 70°C | -20°C | SURFACE MOUNT | 40Ohm | 12pF | 25MHz | 100 µW | 3 PPM/YEAR | PARALLEL - FUNDAMENTAL | 0.001% | |||||||||||||||||||||||||||||
![]() |
LFXTAL071797CUTT | IQD Frequency Products | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Cut Tape | Active | RoHS Compliant | Crystal | 4 | |||||||||||||||||||||||||||||||||||||||||||||
![]() |
9C-24.000MAGJ-T | TXC Corporation | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 13 Weeks | Surface Mount | Tape & Reel (TR) | 9C | Active | 1 (Unlimited) | 4.8mm | RoHS Compliant | 2 | HC-49S | 24MHz | 4.0894mm | Surface Mount | -40°C~85°C | 0.449Lx0.189W 11.40mmx4.80mm | Fundamental | 0.161 4.10mm | MHz Crystal | 30Ohm | ±50ppm | 18pF | ±30ppm | ||||||||||||||||||||||||||||
![]() |
EA2025HA12-27.000MTR | Ecliptek | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Ceramic | EAR99 | 2.5mm | Non-RoHS Compliant | Lead Free | 4 | AT-CUT; TR, 13 INCH | 27MHz | 2mm | e4 | Nickel/Gold (Ni/Au) | YES | 70°C | -20°C | SURFACE MOUNT | 80Ohm | 12pF | 27MHz | 100 µW | 3 PPM/YEAR | PARALLEL - FUNDAMENTAL | 0.0015% | ||||||||||||||||||||||||||||
![]() |
ABM11W-24.0000MHZ-6-J1Z-T3 | Abracon LLC | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 13 Weeks | Tape & Reel (TR) | ABM11W | yes | Active | Not Applicable | RoHS Compliant | TR, 7 INCH | 4-SMD, No Lead | 24MHz | Surface Mount | -40°C~105°C | 0.079Lx0.063W 2.00mmx1.60mm | Fundamental | 0.020 0.50mm | L2.0XB1.6XH0.5 (mm)/L0.079XB0.063XH0.02 (inch) | MHz Crystal | e4 | Nickel/Gold (Ni/Au) | YES | 100Ohm | ±50ppm | 6pF | 24MHz | 10 µW | ±10ppm | ||||||||||||||||||||||||
![]() |
8Y-20.000MAAV-T | TXC Corporation | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 13 Weeks | Surface Mount | Tape & Reel (TR) | 8Y | Active | 1 (Unlimited) | RoHS Compliant | 4-SMD, No Lead | 20MHz | 508μm | Surface Mount | -20°C~70°C | 0.079Lx0.063W 2.00mmx1.60mm | Fundamental | 0.022 0.55mm | MHz Crystal | 100Ohm | ±30ppm | 8pF | |||||||||||||||||||||||||||||||
![]() |
CC4V-T1A32.768KHZ+-20PPM9PF | Micro Crystal | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | Surface Mount | Cut Tape | 85°C | -40°C | RoHS Compliant | 2 | SMD/SMT | No SVHC | 32.768kHz | 9pF | 0.002% | 0.002 % | |||||||||||||||||||||||||||||||||||||||
![]() |
FW2600047Z | Diodes Incorporated | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | 17 Weeks | Tape & Reel (TR) | SaRonix-eCera™ FW | Active | RoHS Compliant | AT-CUT; TR | 4-SMD, No Lead | compliant | 26MHz | Surface Mount | 0.081Lx0.065W 2.05mmx1.65mm | Fundamental | 0.020 0.50mm | 8541.60.00.60 | L2.05XB1.65XH0.45 (mm)/L0.081XB0.065XH0.018 (inch) | MHz Crystal | YES | 120Ohm | 26MHz | 10 µW | |||||||||||||||||||||||||||||||
![]() |
XT9M20HNA14M7456 | Vishay | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Tape and Reel | Active | RoHS Compliant | Crystal | 2 | |||||||||||||||||||||||||||||||||||||||||||||
![]() |
TSX-3225 32.0000MF10Z-AC0 | EPSON | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 11 Weeks | Tape & Reel (TR) | TSX-3225 | Active | 1 (Unlimited) | ROHS3 Compliant | 4-SMD, No Lead | unknown | 32MHz | Surface Mount | -20°C~75°C | 0.126Lx0.098W 3.20mmx2.50mm | Fundamental | 0.024 0.60mm | MHz Crystal | e4 | Gold (Au) | 40Ohm | ±10ppm | 9pF | ||||||||||||||||||||||||||||||
![]() |
EA2025SA10-24.576MTR | Ecliptek | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | Ceramic | 2.5mm | Non-RoHS Compliant | Lead Free | 4 | 24.576MHz | 2mm | e4 | Nickel/Gold (Ni/Au) | 80Ohm | 10pF | PARALLEL - FUNDAMENTAL | 0.001% | ||||||||||||||||||||||||||||||||||||||
![]() |
7M24070038 | TXC Corporation | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | 21 Weeks | Surface Mount | Tape & Reel (TR) | 2014 | 7M | Active | 1 (Unlimited) | 85°C | -40°C | 3.2004mm | RoHS Compliant | 4-SMD, No Lead | 24MHz | 787.4μm | 2.4892mm | Surface Mount | -40°C~85°C | 0.126Lx0.098W 3.20mmx2.50mm | 0.031 0.80mm | MHz Crystal | ±25ppm | 18pF | ±10ppm | ||||||||||||||||||||||||||||
![]() |
416F37022ITT | CTS-Frequency Controls | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | Tape & Reel (TR) | 2015 | 416 | yes | Discontinued | 1 (Unlimited) | ROHS3 Compliant | AT-CUT; TR, 7 INCH | 4-SMD, No Lead | 37MHz | Surface Mount | -40°C~85°C | 0.063Lx0.047W 1.60mmx1.20mm | Fundamental | 0.018 0.45mm | 8541.60.00.60 | L1.6XB1.2XH0.35 (mm)/L0.063XB0.047XH0.014 (inch) | MHz Crystal | e4 | Gold (Au) - with Nickel (Ni) barrier | YES | 60Ohm | ±20ppm | 6pF | 37MHz | 10 µW | ||||||||||||||||||||||||
![]() |
E2UFA20-25.000M | Ecliptek | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | Metal | yes | EAR99 | RoHS Compliant | Lead Free | 2 | AT-CUT CRYSTAL; BULK | 25MHz | 8541.60.00.60 | L11.18XB4.7XH3.68 (mm)/L0.44XB0.185XH0.145 (inch) | e3 | Matte Tin (Sn) - with Nickel (Ni) barrier | NO | 85°C | -40°C | THROUGH HOLE MOUNT | 40Ohm | 20pF | 25MHz | 1000 µW | 5 PPM/YEAR | PARALLEL - FUNDAMENTAL | 0.003% | ||||||||||||||||||||||||||||
![]() |
FA-128 30.0000MF10Z-K0 | EPSON | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 11 Weeks | Tape & Reel (TR) | FA-128 | Active | 1 (Unlimited) | ROHS3 Compliant | 4-SMD, No Lead | 30MHz | Surface Mount | 0.079Lx0.063W 2.00mmx1.60mm | Fundamental | 0.020 0.50mm | MHz Crystal | 60Ohm | ±10ppm | 10pF | ||||||||||||||||||||||||||||||||||
![]() |
NX1255GB-18.432000MHZ | NDK America, Inc. | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 12 Weeks | Surface Mount | Tape & Reel (TR) | NX1255GB | Active | 1 (Unlimited) | 70°C | -10°C | 11.811mm | RoHS Compliant | Exempt | 4-SMD, No Lead | 18.432MHz | 2.6416mm | 5.588mm | Surface Mount | -10°C~70°C | 0.465Lx0.217W 11.80mmx5.50mm | Fundamental | 0.104 2.65mm | MHz Crystal | 50Ohms | ±50ppm | 12pF | ±50ppm | |||||||||||||||||||||||||
![]() |
MCRJ232768F12200H3H | Multicomp | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | Through Hole | 2009 | 70°C | -20°C | RoHS Compliant | 2 | Radial | Unknown | 32.768kHz | 35kOhm | 12.5pF | 0.002% | |||||||||||||||||||||||||||||||||||||||
![]() |
F92400054 | Diodes Incorporated | 0.0000 |
Min: 1 Mult: 1 |
0.00000000 | download | 17 Weeks | Surface Mount | Tape & Reel (TR) | SaRonix-eCera™ F9 | yes | Active | 1 (Unlimited) | RoHS Compliant | AT-CUT; TR | 2-SMD, No Lead | 24MHz | 1.3462mm | Surface Mount | -20°C~70°C | 0.197Lx0.126W 5.00mmx3.20mm | Fundamental | 0.053 1.35mm | 8541.60.00.60 | L5.0XB3.2XH1.2 (mm)/L0.197XB0.126XH0.047 (inch) | MHz Crystal | 60Ohm | ±30ppm | 18pF | 24MHz | 10 μW |
-
CX3225SB24000D0PESZZ AVX Corporation
CX3225SB24000D0PESZZ datasheet pdf and Crystals product details from AVX Corporation stock available at Utmel
Price: 0.0000
RFQ -
EA2025RA10-16.000MTR Ecliptek
EA2025RA10-16.000MTR datasheet pdf and Crystals product details from Ecliptek stock available at Utmel
Price: 0.0000
RFQ -
-
416F40635CST CTS-Frequency Controls
416F40635CST datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
445A35C30M00000 CTS-Frequency Controls
445A35C30M00000 datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
GLA67F23CDT CTS-Frequency Controls
GLA67F23CDT datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
416F44023CLR CTS-Frequency Controls
416F44023CLR datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
416F270X2CKT CTS-Frequency Controls
416F270X2CKT datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
LFXTAL062001BULK IQD Frequency Products
Crystal 16MHz ±30ppm (Tol) ±30ppm (Stability) 18pF FUND 50Ohm 2-Pin CSMD Bulk
Price: 0.0000
RFQ -
RT2012-32.768-12.5-EXT-TR Raltron Electronics
RT2012-32.768-12.5-EXT-TR datasheet pdf and Crystals product details from Raltron Electronics stock available at Utmel
Price: 0.0000
RFQ -
ABM8W-19.9680MHZ-8-D1X-T3 Abracon LLC
ABM8W-19.9680MHZ-8-D1X-T3 datasheet pdf and Crystals product details from Abracon LLC stock available at Utmel
Price: 0.0000
RFQ -
F92700044 Diodes Incorporated
F92700044 datasheet pdf and Crystals product details from Diodes Incorporated stock available at Utmel
Price: 0.0000
RFQ -
EA3250PA12-25.000MTR Ecliptek
EA3250PA12-25.000MTR datasheet pdf and Crystals product details from Ecliptek stock available at Utmel
Price: 0.0000
RFQ -
LFXTAL071797CUTT IQD Frequency Products
Crystal 36.4MHz ±50ppm (Tol) ±100ppm (Stability) 8pF FUND 50Ohm Automotive 4-Pin CSMD Cut Tape
Price: 0.0000
RFQ -
9C-24.000MAGJ-T TXC Corporation
9C-24.000MAGJ-T datasheet pdf and Crystals product details from TXC Corporation stock available at Utmel
Price: 0.0000
RFQ -
EA2025HA12-27.000MTR Ecliptek
EA2025HA12-27.000MTR datasheet pdf and Crystals product details from Ecliptek stock available at Utmel
Price: 0.0000
RFQ -
-
-
CC4V-T1A32.768KHZ+-20PPM9PF Micro Crystal
CC4V-T1A32.768KHZ+-20PPM9PF datasheet pdf and Crystals product details from Micro Crystal stock available at Utmel
Price: 0.0000
RFQ -
FW2600047Z Diodes Incorporated
FW2600047Z datasheet pdf and Crystals product details from Diodes Incorporated stock available at Utmel
Price: 0.0000
RFQ -
XT9M20HNA14M7456 Vishay
Crystal 14.7456MHz ±30ppm (Tol) ±50ppm (Stability) 20pF FUND 50Ohm 2-Pin SMD T/R
Price: 0.0000
RFQ -
TSX-3225 32.0000MF10Z-AC0 EPSON
TSX-3225 32.0000MF10Z-AC0 datasheet pdf and Crystals product details from EPSON stock available at Utmel
Price: 0.0000
RFQ -
EA2025SA10-24.576MTR Ecliptek
EA2025SA10-24.576MTR datasheet pdf and Crystals product details from Ecliptek stock available at Utmel
Price: 0.0000
RFQ -
7M24070038 TXC Corporation
7M24070038 datasheet pdf and Crystals product details from TXC Corporation stock available at Utmel
Price: 0.0000
RFQ -
416F37022ITT CTS-Frequency Controls
416F37022ITT datasheet pdf and Crystals product details from CTS-Frequency Controls stock available at Utmel
Price: 0.0000
RFQ -
E2UFA20-25.000M Ecliptek
E2UFA20-25.000M datasheet pdf and Crystals product details from Ecliptek stock available at Utmel
Price: 0.0000
RFQ -
FA-128 30.0000MF10Z-K0 EPSON
FA-128 30.0000MF10Z-K0 datasheet pdf and Crystals product details from EPSON stock available at Utmel
Price: 0.0000
RFQ -
NX1255GB-18.432000MHZ NDK America, Inc.
NX1255GB-18.432000MHZ datasheet pdf and Crystals product details from NDK America, Inc. stock available at Utmel
Price: 0.0000
RFQ -
MCRJ232768F12200H3H Multicomp
MCRJ232768F12200H3H datasheet pdf and Crystals product details from Multicomp stock available at Utmel
Price: 0.0000
RFQ -
F92400054 Diodes Incorporated
24MHz ±30ppm Crystal 18pF 60 Ohm -20°C ~ 70°CSurface Mount 2-SMD, No Lead (DFN, LCC)
Price: 0.0000
RFQ