TPA2039D1YFFR
Texas Instruments
IC AMP CLASS D MONO 3.24W 9DSBGA
Sa stock112620 pcs
9-DSBGA
Tape & Reel (TR)
TPA2039
3.24W x 1 @ 4Ohm
2.5V ~ 5.5V
9-UFBGA, DSBGA
Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
AD1991ASV
Analog Devices Inc.
IC AMP AUDIO PWR 40W STER 52TQFP
Sa stock3678 pcs
52-TQFP-EP (10x10)
Bag
AD1991
40W x 1 @ 4Ohm; 20W x 2 @ 8Ohm
6.5V ~ 22.5V
52-TQFP Exposed Pad
Depop, Mute, Short-Circuit and Thermal Protection
2-Channel (Stereo) or 4-Channel (Quad)
Class D
Surface Mount
-
-
RFQ
MAX9750CETI+C2U
Analog Devices Inc./Maxim Integrated
IC AMP CLASS AB STER 2.2W 28TQFN
Sa stock11090 pcs
28-TQFN (5x5)
Tube
MAX9750
2.2W x 2 @ 3Ohm; 110mW x 2 @ 16Ohm
4.5V ~ 5.5V
28-WFQFN Exposed Pad
Depop, Short-Circuit and Thermal Protection, Shutdown, Volume Control
2-Channel (Stereo) with Stereo Headphones
Class AB
Surface Mount
-40°C ~ 85°C (TA)
DirectDrive®
RFQ
TS4902ID
STMicroelectronics
IC AMP CLASS AB MONO 700MW 8SO
Sa stock14800 pcs
8-SOIC
Tube
TS4902
700mW x 1 @ 8Ohm
2.2V ~ 5.5V
8-SOIC (0.154", 3.90mm Width)
Depop, Standby, Thermal Protection
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
MP1720DH-216-LF-Z
Monolithic Power Systems Inc.
IC AMP CLASS D MONO 2.78W 10MSOP
Sa stock85610 pcs
10-MSOP-EP
Tape & Reel (TR)
MP1720
2.78W x 1 @ 4Ohm
-
10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Depop, Short-Circuit and Thermal Protection
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA4861D
Texas Instruments
IC AMP CLASS AB MONO 1.1W 8SOIC
Sa stock45193 pcs
8-SOIC
Tube
TPA4861
1.1W x 1 @ 8Ohm
2.7V ~ 5.5V
8-SOIC (0.154", 3.90mm Width)
Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TFA9879HN/N1,157
NXP USA Inc.
IC AMP CLSS D MONO 2.75W 24HVQFN
Sa stock39201 pcs
24-HVQFN (4x4)
Tray
TFA9879
2.75W x 1 @ 4Ohm
2.5V ~ 5.5V
24-VFQFN Exposed Pad
Depop, Digital Inputs, I²C, I²S, Mute, Short-Circuit and Thermal Protection, Tone and Volume Control
1-Channel (Mono)
Class D
Surface Mount
-20°C ~ 85°C (TA)
-
RFQ
TPA3129D2DAPR
Texas Instruments
IC AMP CLASS D STER 30W 32HTSSOP
Sa stock42783 pcs
32-HTSSOP
Tape & Reel (TR)
TPA3129
15W x 2 @ 8Ohm
4.5V ~ 26V
32-PowerTSSOP (0.240", 6.10mm Width)
Short-Circuit and Thermal Protection
2-Channel (Stereo)
Class D
Surface Mount
-40°C ~ 85°C
-
RFQ
TPA2018D1YZFR
Texas Instruments
IC AMP CLASS D MONO 3W 9DSBGA
Sa stock36660 pcs
9-DSBGA
Tape & Reel (TR)
TPA2018
3W x 1 @ 4Ohm
2.5V ~ 5.5V
9-UFBGA, DSBGA
Differential Inputs, I²C, Short-Circuit and Thermal Protection, Shutdown, Volume Control
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
SmartGain™
RFQ
TLV320DAC3203IRGER
Texas Instruments
IC AMP CLASS AB STEREO 24VQFN
Sa stock45360 pcs
24-VQFN (4x4)
Tape & Reel (TR)
TLV320
-
1.5V ~ 1.95V
24-VFQFN Exposed Pad
DAC, Depop, I²C, I²S, Microphone, Mute, SPI, Volume Control
Headphones, 2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
PowerTune™
RFQ
SSM2166SZ
Analog Devices Inc.
IC AMP CLASS AB MONO 14SOIC
Sa stock6680 pcs
14-SOIC
Tube
SSM2166
-
4.5V ~ 5.5V
14-SOIC (0.154", 3.90mm Width)
Microphone
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
FPA6101MTCX
onsemi
IC AMP CLSS AB STER 2.4W 28TSSOP
Sa stock12450 pcs
28-TSSOP
Tape & Reel (TR)
FPA610
2.4W x 2 @ 4Ohm; 200mW x 2 @ 16Ohm
4.5V ~ 5.5V
28-TSSOP (0.173", 4.40mm Width)
Depop, Short-Circuit and Thermal Protection, Shutdown
2-Channel (Stereo) with Stereo Headphones
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
LA4725-E
onsemi
IC CAR AUDIO AMP BTL 4CH 14SIPHZ
Sa stock6540 pcs
-
Tube
LA4725
-
-
-
-
-
-
-
-
*
RFQ
TPA0212PWP
Texas Instruments
IC AMP AB STEREO 2.6W 24HTSSOP
Sa stock13666 pcs
24-HTSSOP
Tube
TPA0212
2.6W x 2 @ 3Ohm
4.5V ~ 5.5V
24-PowerTSSOP (0.173", 4.40mm Width)
Depop, Differential Inputs, Input Multiplexer, Mute, Shutdown, Thermal Protection, Volume Control
2-Channel (Stereo) with Stereo Headphones
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
DRV612PWR
Texas Instruments
IC AMP CLASS AB STEREO 14TSSOP
Sa stock73630 pcs
14-TSSOP
Tape & Reel (TR)
DRV612
-
3V ~ 3.6V
14-TSSOP (0.173", 4.40mm Width)
Depop, Mute, Short-Circuit and Thermal Protection
2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
DirectPath™
RFQ
TDA7240AV
STMicroelectronics
IC AMP AB MONO 20W 7HEPTAWATT
Sa stock7040 pcs
7-HEPTAWATT
Tube
TDA7240
20W x 1 @ 4Ohm
8V ~ 18V
Heptawatt-7 (Vertical, Bent and Staggered Leads)
Short-Circuit and Thermal Protection, Standby
1-Channel (Mono)
Class AB
Through Hole
-40°C ~ 150°C (TJ)
-
RFQ
DRV603PWR
Texas Instruments
IC AMP CLASS AB STEREO 14TSSOP
Sa stock67620 pcs
14-TSSOP
Tape & Reel (TR)
DRV603
-
3V ~ 5.5V
14-TSSOP (0.173", 4.40mm Width)
Depop, Differential Inputs, Short-Circuit Protection, Shutdown
2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
DirectPath™
RFQ
MAX9744ETH+T
Analog Devices Inc./Maxim Integrated
IC AMP CLASS D STER 22.5W 44TQFN
Sa stock11453 pcs
44-TQFN (7x7)
Tape & Reel (TR)
MAX9744
22.5W x 2 @ 4Ohm
4.5V ~ 14V
44-WFQFN Exposed Pad
Depop, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control
2-Channel (Stereo)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
MAX9716ETA+T
Analog Devices Inc./Maxim Integrated
IC AMP CLASS AB MONO 1.4W 8TDFN
Sa stock49480 pcs
8-TDFN (3x3)
Tape & Reel (TR)
MAX9716
1.4W x 1 @ 4Ohm
2.7V ~ 5.5V
8-WDFN Exposed Pad
Depop, Differential Inputs, Shutdown, Thermal Protection
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
BD5452AMUV-E2
Rohm Semiconductor
IC AMP D STEREO 15W VQFN032V5050
Sa stock12112 pcs
VQFN032V5050
Tape & Reel (TR)
BD5452
15W x 2 @ 8Ohm
10V ~ 18V
32-VFQFN Exposed Pad
Depop, Short-Circuit Protection
2-Channel (Stereo)
Class D
Surface Mount
-25°C ~ 85°C (TA)
-
RFQ
MAX9759ETE+
Analog Devices Inc./Maxim Integrated
IC AMP CLASS D MONO 4.3W 16TQFN
Sa stock28958 pcs
16-TQFN (4x4)
Tube
MAX9759
4.3W x 1 @ 3Ohm
3V ~ 5.5V
16-WQFN Exposed Pad
Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA741DGNG4
Texas Instruments
IC AMP CLASS AB MONO 700MW 8MSOP
Sa stock10770 pcs
8-HVSSOP
Tube
TPA741
700mW x 1 @ 8Ohm
2.5V ~ 5.5V
8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
MAX9700BEUB+T
Analog Devices Inc./Maxim Integrated
IC AMP CLASS D MONO 1.6W 10UMAX
Sa stock38040 pcs
10-uMAX/uSOP
Tape & Reel (TR)
MAX9700
1.6W x 1 @ 6Ohm
2.5V ~ 5.5V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TDA7263M
STMicroelectronics
IC AMP AB STEREO 12W 11MULTIWATT
Sa stock8710 pcs
11-Multiwatt
Tube
TDA7263
12W x 2 @ 8Ohm
10V ~ 30V
Multiwatt-11 (Vertical, Bent and Staggered Leads)
Depop, Mute, Short-Circuit and Thermal Protection
2-Channel (Stereo)
Class AB
Through Hole
0°C ~ 70°C (TA)
-
RFQ
ISL99202IRTAZ
Renesas Electronics America Inc
IC AMP CLASS AB STER 70MW 12TQFN
Sa stock4550 pcs
12-TQFN (3x3)
Tube
ISL99202
70mW x 2 @ 16Ohm
2.4V ~ 5.5V
12-WFQFN Exposed Pad
Depop, Short-Circuit and Thermal Protection, Shutdown
Headphones, 2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
MAX9716EUA+T
Analog Devices Inc./Maxim Integrated
IC AMP CLASS AB MONO 1.4W 8UMAX
Sa stock36250 pcs
8-uMAX-EP|8-uSOP-EP
Tape & Reel (TR)
MAX9716
1.4W x 1 @ 4Ohm
2.7V ~ 5.5V
8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Depop, Differential Inputs, Shutdown, Thermal Protection
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA0103PWPR
Texas Instruments
IC AMP AB 3 CHAN 2.1W 24HTSSOP
Sa stock22565 pcs
24-HTSSOP
Tape & Reel (TR)
TPA0103
2.1W x 1 @ 4Ohm; 575mW x 2 @ 4Ohm
3V ~ 5.5V
24-PowerTSSOP (0.173", 4.40mm Width)
Input Multiplexer, Mute, Shutdown
3-Channel
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
ADAU1592ACPZ
Analog Devices Inc.
IC AMP CLASS D STER 24W 48LFCSP
Sa stock9779 pcs
48-LFCSP-VQ (7x7)
Bulk
ADAU1592
24W x 2 @ 4Ohm
9V ~ 18V
48-VFQFN Exposed Pad, CSP
Depop, Mute, Short-Circuit and Thermal Protection, Standby
2-Channel (Stereo)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA701DGN
Texas Instruments
IC AMP CLASS AB MONO 700MW 8MSOP
Sa stock47990 pcs
8-HVSSOP
Tube
TPA701
700mW x 1 @ 8Ohm
2.5V ~ 5.5V
8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
NJM2135M
Nisshinbo Micro Devices Inc.
IC AMP CLASS AB MONO 400MW 8DMP
Sa stock70800 pcs
8-DMP
Tube
NJM2135
400mW x 1 @ 100Ohm
2V ~ 16V
8-SOIC (0.209", 5.30mm Width)
Standby
1-Channel (Mono)
Class AB
Surface Mount
-20°C ~ 75°C (TA)
-
RFQ
D2-24044-MR
Renesas Electronics America Inc
IC AMP D DUAL/QUAD 30W 38HTSSOP
Sa stock16476 pcs
38-HTSSOP
Tube
D2-24044
30W x 2 @ 8Ohm
9V ~ 26V
38-TFSOP (0.173", 4.40mm Width) Exposed Pad
-
2-Channel (Stereo) or 4-Channel (Quad)
Class D
Surface Mount
-10°C ~ 85°C (TA)
D2Audio™
RFQ
TPA2037D1YFFR
Texas Instruments
IC AMP CLASS D MONO 3.24W 9DSBGA
Sa stock113430 pcs
9-DSBGA
Tape & Reel (TR)
TPA2037
3.24W x 1 @ 4Ohm
2.5V ~ 5.5V
9-UFBGA, DSBGA
Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TDA7850A
STMicroelectronics
IC AMP AB QUAD 85W 27FLEXIWATT
Sa stock4760 pcs
27-Flexiwatt (Vertical)
Tube
TDA7850
85W x 4 @ 2Ohm
8V ~ 18V
27-Flexiwatt (Formed Leads)
Mute, Short-Circuit and Thermal Protection, Standby
4-Channel (Quad)
Class AB
Through Hole
-55°C ~ 150°C (TJ)
-
RFQ
LA4537MC-BH
onsemi
IC AMP CLASS AB STER 8MW 10SOIC
Sa stock8820 pcs
10-SOIC
Tape & Reel (TR)
LA4537
8mW x 2 @ 16Ohm
0.9V ~ 4V
10-SOP (0.173", 4.40mm Width)
Mute
2-Channel (Stereo)
Class AB
Surface Mount
-20°C ~ 75°C (TA)
-
RFQ
MAX9719AETE+T
Analog Devices Inc./Maxim Integrated
IC AMP CLASS AB STER 1.4W 16TQFN
Sa stock28409 pcs
16-TQFN (4x4)
Tape & Reel (TR)
MAX9719
1.4W x 2 @ 4Ohm
2.7V ~ 5.5V
16-WQFN Exposed Pad
Depop, Differential Inputs, Shutdown, Thermal Protection
2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA701DR
Texas Instruments
IC AMP CLASS AB MONO 700MW 8SOIC
Sa stock52390 pcs
8-SOIC
Tape & Reel (TR)
TPA701
700mW x 1 @ 8Ohm
2.5V ~ 5.5V
8-SOIC (0.154", 3.90mm Width)
Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA2034D1YZFT
Texas Instruments
IC AMP CLASS D MONO 2.75W 9DSBGA
Sa stock41667 pcs
9-DSBGA
Tape & Reel (TR)
TPA2034
2.75W x 1 @ 4Ohm
2.5V ~ 5.5V
9-UFBGA, DSBGA
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
NanoFree™
RFQ
TPA2050D4YZKT
Texas Instruments
IC AMP CLASS D STER 1.4W 25DSBGA
Sa stock7390 pcs
25-DSBGA
Tape & Reel (TR)
TPA205
1.4W x 2 @ 8Ohm
2.5V ~ 5.5V
25-UFBGA, DSBGA
Depop, Differential Inputs, I²C, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control
2-Channel (Stereo) with Stereo Headphones
Class D
Surface Mount
-40°C ~ 85°C (TA)
DirectPath™
RFQ
SA58670BS,115
NXP USA Inc.
IC AMP CLASS D STER 2.1W 20HVQFN
Sa stock11310 pcs
20-HVQFN (4x4)
Tape & Reel (TR)
SA586
2.1W x 2 @ 4Ohm
2.5V ~ 5.5V
20-VFQFN Exposed Pad
Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
2-Channel (Stereo)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
NCP2811BFCCT1G
onsemi
IC AMP AB STER 110MW 12FLIPCHIP
Sa stock124620 pcs
12-FlipChip (2x1.5)
Tape & Reel (TR)
NCP2811
110mW x 1 @ 16Ohm
2.7V ~ 5V
12-UFBGA, FCBGA
Depop, Differential Inputs, Shutdown, Thermal Protection
Headphones, 2-Channel (Stereo)
Class AB
Surface Mount
-40°C ~ 85°C (TA)
NOCAP™
RFQ
LV4924VH-TLM-H
onsemi
IC AMP CLASS D STER 15W 36HSSOP
Sa stock6580 pcs
36-HSSOP
Tape & Reel (TR)
LV492
15W x 2 @ 8Ohm
9V ~ 20V
36-LSSOP (0.220", 5.60mm Width) Exposed Pad + 2 Heat Tabs
Mute, Short-Circuit and Thermal Protection, Standby
2-Channel (Stereo)
Class D
Surface Mount
-25°C ~ 75°C (TA)
-
RFQ
SSM2250RMZ-R2
Analog Devices Inc.
IC AMP AUDIO PWR 1.5W AB 10MSOP
Sa stock29630 pcs
10-MSOP
Bulk
SSM2250
1.5W x 1 @ 8Ohm; 90mW x 2 @ 32Ohm
2.7V ~ 6V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Depop, Shutdown
1-Channel (Mono) with Stereo Headphones
Class AB
Surface Mount
-
SoundMAX®
RFQ
TPA6211A1TDGNRQ1
Texas Instruments
IC AMP CLASS AB MONO 3.1W 8MSOP
Sa stock85450 pcs
8-HVSSOP
Tape & Reel (TR)
TPA6211A1
3.1W x 1 @ 3Ohm
2.5V ~ 5.5V
8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Depop, Differential Inputs, Shutdown, Thermal Protection
1-Channel (Mono)
Class AB
Surface Mount
-40°C ~ 105°C (TA)
Automotive, AEC-Q100
RFQ
RT9101GQW
Richtek USA Inc.
IC AMP CLASS D MONO 2.65W 8WDFN
Sa stock17470 pcs
8-WDFN (3x3)
Tape & Reel (TR)
RT9101
2.65W x 1 @ 4Ohm
2.5V ~ 5.5V
8-WDFN Exposed Pad
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
1-Channel (Mono)
Class D
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TPA0142PWPR
Texas Instruments
IC AMP AB STEREO 2.8W 24HTSSOP
Sa stock14390 pcs
24-HTSSOP
Tape & Reel (TR)
TPA014
2.8W x 2 @ 3Ohm
4.5V ~ 5.5V
24-PowerTSSOP (0.173", 4.40mm Width)
Depop, Differential Inputs, Input Multiplexer, Mute, Shutdown, Thermal Protection, Volume Control
2-Channel (Stereo) with Stereo Headphones
Class AB
Surface Mount
-40°C ~ 85°C (TA)
-
RFQ
TDA2822M
STMicroelectronics
IC AMP AB MONO/STER 2W 8MINI DIP
Sa stock10210 pcs
8-Mini DIP
Tube
TDA2822
2W x 1 @ 16Ohm; 1W x 2 @ 8Ohm
1.8V ~ 15V
8-DIP (0.300", 7.62mm)
-
1-Channel (Mono) or 2-Channel (Stereo)
Class AB
Through Hole
-40°C ~ 150°C (TJ)
-
RFQ
MA12040XUMA1
Infineon Technologies
IC AMP CLASS D STEREO 40W 64QFN
Sa stock12849 pcs
PG-VQFN-64-6
Tape & Reel (TR)
MA12040
40W x 2 @ 4Ohm
4V ~ 18V
64-VFQFN Exposed Pad
Digital Inputs, I2C, Mute, Short-Circuit and Thermal Protection, Undervoltage, Volume Control
2-Channel (Stereo)
Class D
Surface Mount
0°C ~ 85°C (TA)
MERUS™
RFQ
TDA7266D
STMicroelectronics
IC AMP AB STEREO 5W POWERSO-20
Sa stock8800 pcs
PowerSO-20
Tube
TDA7266
5W x 2 @ 8Ohm
3.5V ~ 12V
20-SOIC (0.433", 11.00mm Width) Exposed Pad
Mute, Short-Circuit and Thermal Protection, Standby
2-Channel (Stereo)
Class AB
Surface Mount
0°C ~ 70°C (TA)
-
RFQ
TAS5186ADDV
Texas Instruments
IC AMP D 6 CHAN 60W 44HTSSOP
Sa stock2258 pcs
44-HTSSOP
Tube
TAS5186
60W x 1 @ 3Ohm; 30W x 5 @ 6Ohm
10.8V ~ 13.2V
44-PowerTSSOP (0.244", 6.20mm Width)
Digital Inputs, Short-Circuit and Thermal Protection, Shutdown
6-Channel
Class D
Surface Mount
0°C ~ 70°C (TA)
PurePath Digital™
RFQ
CS3511-CNZ
Cirrus Logic Inc.
IC AMP CLASS D STER 11.8W 32QFN
Sa stock8930 pcs
32-QFN (6x6)
Tray
-
11.8W x 2 @ 6Ohm
8.5V ~ 13.2V
32-VQFN Exposed Pad
Differential Inputs, Mute, Short-Circuit and Thermal Protection, Shutdown
2-Channel (Stereo)
Class D
Surface Mount
-10°C ~ 70°C (TA)
-
RFQ