LT1952EGN-1#PBF
Analog Devices Inc.
IC REG CTRLR FWRD CONV 16SSOP
Raktáron7518 pcs
Enable, Frequency Control
1
90%
Yes
Yes
-
Forward Converter
LT1952
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-SSOP
Step-Up/Step-Down
100kHz ~ 500kHz
1
Positive, Isolation Capable
6.82V ~ 25V
RFQ
L6726ATR
STMicroelectronics
IC REG CTRLR BUCK 8SOIC
Raktáron45800 pcs
Enable, Frequency Control, Phase Control, Power Good
1
80%
Yes
No
-
Buck
L6726
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 150°C (TJ)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
270kHz
1
Positive
4.1V ~ 13.2V
RFQ
IRU3038CS
Infineon Technologies
IC REG CTRLR BUCK/BOOST 14SOIC
Raktáron7310 pcs
Frequency Control, Soft Start
1
90%
Yes
No
-
Buck, Boost
IRU3038
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Down
200kHz
1
Positive
4.2V ~ 25V
RFQ
ISL6420IRZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 20QFN
Raktáron11920 pcs
Enable, Frequency Control, Phase Control, Power Good, Soft Start
1
96%
Yes
No
-
Buck
ISL6420
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
20-VFQFN Exposed Pad
20-QFN (4x4)
Step-Down
100kHz ~ 1.4MHz
1
Positive
5.6V ~ 16V
RFQ
ISL8105BCBZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 8SOIC
Raktáron8110 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
ISL8105
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
300kHz
1
Positive
6.5V ~ 14.4V
RFQ
LTC1622IS8#TR
Analog Devices Inc.
IC REG CTRLR BUCK 8SOIC
Raktáron6800 pcs
Enable, Soft Start
1
100%
No
Yes
-
Buck
LTC1622
Bulk
Transistor Driver
-
-45°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SO
Step-Down
-
1
Positive
2V ~ 10V
RFQ
UC3842BVD1R2G
onsemi
IC REG CTRLR BST FLYBK ISO 8SOIC
Raktáron120570 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC3842
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 30V
RFQ
CHL8112A-04CRT
Infineon Technologies
IC REG BUCK 40VQFN
Raktáron7690 pcs
Enable, Power Good
5
-
No
No
I²C, PMBus, SMBus
Buck
CHL8112
Tape & Reel (TR)
PWM
-
0°C ~ 85°C (TA)
Surface Mount
40-VFQFN Exposed Pad
PG-VQFN-40-902
Step-Down
200kHz ~ 1.2MHz
5
Positive
3.3V
RFQ
IRU3137CSTR
Infineon Technologies
IC REG CTRLR BUCK 8SOIC
Raktáron11800 pcs
Enable, Soft Start
1
90%
Yes
No
-
Buck
IRU3137
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
200kHz
1
Positive
4.25V ~ 25V
RFQ
ISL6341CRZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 10-TDFN
Raktáron13707 pcs
Enable, Phase Control, Power Good, Power on Reset
1
85%
Yes
No
-
Buck
ISL6341
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
10-WFDFN Exposed Pad
10-TDFN-EP (3x3)
Step-Down
300kHz
1
Positive
4.5V ~ 14.4V
RFQ
TPS40003DGQ
Texas Instruments
IC REG CTRLR BUCK 10MSOP
Raktáron19799 pcs
Current Limit, Enable, Soft Start
1
93%
Yes
No
-
Buck
TPS40003
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-PowerTFSOP, 10-MSOP (0.118', 3.00mm Width)
10-HVSSOP
Step-Down
600kHz
1
Positive
2.25V ~ 5.5V
RFQ
CS5161GD16
onsemi
SWITCHING CONTROLLER
Raktáron57770 pcs
-
-
-
-
-
-
-
CS5161
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
LTC3803ES6-5#TRMPBF
Analog Devices Inc.
IC REG CTRLR FLYBACK TSOT23-6
Raktáron10845 pcs
Current Limit, Enable
1
80%
No
No
-
Flyback
LTC3803
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
SOT-23-6 Thin, TSOT-23-6
TSOT-23-6
Step-Up/Step-Down
200kHz
1
Positive, Isolation Capable
4V ~ 8.1V
RFQ
UC3524DTR
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
Raktáron5480 pcs
Current Limit, Enable, Frequency Control, Ramp
1
45%
No
No
-
Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
UC3524
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Up, Step-Up/Step-Down
300kHz
2
Positive
8V ~ 40V
RFQ
ISL6552CB
Renesas Electronics America Inc
IC REG CTRLR BUCK 20SOIC
Raktáron4420 pcs
Enable, Frequency Control, Power Good
4
-
-
No
-
Buck
ISL6552
Tube
PWM Signal
-
0°C ~ 70°C (TA)
Surface Mount
20-SOIC (0.295", 7.50mm Width)
20-SOIC
Step-Down
50kHz ~ 1.5MHz
4
Positive
4.75V ~ 5.25V
RFQ
TPS51117PW
Texas Instruments
IC REG CTRLR BUCK 14TSSOP
Raktáron23716 pcs
Enable, On Time Control, Power Good
1
-
Yes
No
-
Buck
TPS51117
Tube
Transistor Driver
D-CAP™
-40°C ~ 85°C (TA)
Surface Mount
14-TSSOP (0.173", 4.40mm Width)
14-TSSOP
Step-Down
-
1
Positive
4.5V ~ 5.5V
RFQ
SC470ITSTRT
Semtech Corporation
IC REG CTRLR BUCK 14TSSOP
Raktáron14120 pcs
Current Limit, Enable, On Time Control, Power Good
1
-
Yes
No
-
Buck
SC470
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
14-TSSOP (0.173', 4.40mm Width)
14-TSSOP
Step-Down
-
1
Positive
4.5V ~ 5.5V
RFQ
LTC3784EUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BOOST 28QFN
Raktáron6224 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
2
96%
Yes
No
-
Boost
LTC3784
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Up
105kHz ~ 760kHz
2
Positive
4.5V ~ 60V
RFQ
LM5176RHFR
Texas Instruments
IC POWER REGULATOR
Raktáron9959 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
1
-
Yes
Yes
-
Buck-Boost
LM5176
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-VFQFN Exposed Pad
28-VQFN (5x4)
Step-Up/Step-Down
100kHz ~ 600kHz
1
Positive
4.2V ~ 55V
RFQ
LT3825EFE#PBF
Analog Devices Inc.
IC REG CTRLR FLYBACK 16TSSOP
Raktáron6690 pcs
Enable, Frequency Control, On Time Control
1
88%
Yes
Yes
-
Flyback
LT3825
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173", 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Up/Step-Down
100kHz
1
Positive, Isolation Capable
9.7V ~ 18V
RFQ
ISL62871HRUZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 16TQFN
Raktáron18418 pcs
Enable, Phase Control, Power Good, Soft Start
1
-
Yes
No
-
Buck
ISL62871
Tape & Reel (TR)
Transistor Driver
Robust Ripple Regulator™ (R3)
-10°C ~ 100°C (TA)
Surface Mount
16-UFQFN
16-UTQFN (2.6x1.8)
Step-Down
300kHz
1
Positive
3.3V ~ 25V
RFQ
MAX1967EUB+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 10UMAX
Raktáron9678 pcs
Enable
1
95%
Yes
No
-
Buck
MAX1967
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-uMAX/uSOP
Step-Down
102kHz
1
Positive
2.7V ~ 28V
RFQ
RT8101AGSP
Richtek USA Inc.
IC REG CTRLR BUCK 8SOP
Raktáron14580 pcs
Phase Control
1
100%
Yes
No
-
Buck
RT8101
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width) Exposed Pad
8-SOP-EP
Step-Down
600kHz
1
Positive
10.8V ~ 13.2V
RFQ
UCC28C44P
Texas Instruments
IC OFFLINE CTRLR PWM UVLO 8DIP
Raktáron3880 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback, Forward Converter
UCC28C44
Tube
Transistor Driver
-
-40°C ~ 105°C (TJ)
Through Hole
8-DIP (0.300', 7.62mm)
8-PDIP
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive
9V ~ 18V
RFQ
AP2008SL-13
Diodes Incorporated
IC REG CTRLR BUCK 8SOIC
Raktáron15100 pcs
Soft Start
1
-
No
No
-
Buck
AP2008
Tape & Reel (TR)
Transistor Driver
-
-20°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOP
Step-Down
10kHz ~ 300kHz
1
Positive
3.6V ~ 20V
RFQ
MAX16933ATIR/V+T
Analog Devices Inc./Maxim Integrated
1MHZ, 36V, DUAL BUCK WITH 20UA Q
Raktáron3991 pcs
Enable, Frequency Control, Power Good
2
98.5%
Yes
Yes
-
Buck
MAX16933
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-TQFN (5x5)
Step-Down
200kHz ~ 1MHz
2
Positive
3.5V ~ 42V
RFQ
ADP1871ACPZ-0.6-R7
Analog Devices Inc.
IC REG CTRLR BUCK 10LFCSP
Raktáron26183 pcs
Enable
1
65%
Yes
No
-
Buck
ADP1871
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
10-VFDFN Exposed Pad, CSP
10-LFCSP-WD (3x3)
Step-Down
600kHz
1
Positive
2.95V ~ 20V
RFQ
NCP1571DG
onsemi
IC REG CTRLR BUCK 8SOIC
Raktáron3690 pcs
Power Good
1
-
Yes
No
-
Buck
NCP1571
Tube
Transistor Driver
-
0°C ~ 125°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
200kHz
1
Positive
7.5V ~ 15V
RFQ
LT3757HMSE#TRPBF
Analog Devices Inc.
IC REG CTRLR MULT TOP 10MSOP
Raktáron6619 pcs
Enable, Frequency Control, Soft Start
1
-
No
Yes
-
Boost, Flyback, SEPIC
LT3757
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 150°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width) Exposed Pad
10-MSOP-EP
Step-Up, Step-Up/Step-Down
100kHz ~ 1MHz
1
Positive and Negative
2.9V ~ 40V
RFQ
UCC28C44DGK
Texas Instruments
IC OFFLINE CTRLR PWM UVLO 8VSSOP
Raktáron30786 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback, Forward Converter
UCC28C44
Tube
Transistor Driver
-
-40°C ~ 105°C (TJ)
Surface Mount
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-VSSOP
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive
9V ~ 18V
RFQ
LT1737IGN#PBF
Analog Devices Inc.
IC REG CTRLR FLYBACK 16SSOP
Raktáron5756 pcs
Enable, Soft Start
1
90%
No
No
-
Flyback
LT1737
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-SSOP
Step-Up/Step-Down
90kHz ~ 115kHz
1
Positive or Negative, Isolation Capable
4.1V ~ 20V
RFQ
MAX5068BAUE+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR FLYBACK 16TSSOP
Raktáron5021 pcs
Dead Time Control, Enable, Frequency Control
1
50%
Yes
Yes
-
Flyback
MAX5068
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173', 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Up/Step-Down
25kHz ~ 1.25MHz
1
Positive, Isolation Capable
10.8V ~ 24V
RFQ
MIC38HC43-1BN
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 14DIP
Raktáron9970 pcs
Frequency Control
1
96%
Yes
No
-
Buck, Boost, Flyback, Forward Converter
MIC38HC43
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-DIP (0.300", 7.62mm)
14-DIP
Step-Up, Step-Down, Step-Up/Step-Down
-
1
Positive, Isolation Capable
7.6V ~ 20V
RFQ
MAX16933CATIS/V+T
Analog Devices Inc./Maxim Integrated
IC REG BUCK 3.3V/5V/ADJ 28TQFN
Raktáron7034 pcs
Enable, Frequency Control, Power Good
2
98.5%
Yes
Yes
-
Buck
MAX16933
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-TQFN (5x5)
Step-Down
200kHz ~ 1MHz
2
Positive
3.5V ~ 42V
RFQ
S-8521F36MC-BPVT2G
ABLIC Inc.
IC REG CTRLR BUCK SOT23-5
Raktáron65650 pcs
Enable
1
100%
No
No
-
Buck
S-8521
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Down
300kHz
1
Positive
2.5V ~ 16V
RFQ
HIP6008CB
Intersil
BUCK PULSE-WIDTH MODULATOR (PWM)
Raktáron22628 pcs
-
-
-
-
-
-
-
HIP6008
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UC3842BD
onsemi
IC REG CTRLR PWM CM 14-SOIC
Raktáron9280 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC3842
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 30V
RFQ
MAX1744EUB
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 10UMAX
Raktáron14340 pcs
Enable
1
100%
No
No
-
Buck
MAX1744
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-uMAX/uSOP
Step-Down
Up to 330kHz
1
Positive
4.5V ~ 36V
RFQ
LTC3835IFE#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 20TSSOP
Raktáron4563 pcs
Enable, Phase Control, Power Good, Soft Start, Tracking
1
99.4%
Yes
No
-
Buck
LTC3835
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
20-TSSOP (0.173', 4.40mm Width) Exposed Pad
20-TSSOP-EP
Step-Down
250kHz ~ 530kHz
1
Positive
4V ~ 36V
RFQ
LT8390AIUFD#PBF
Analog Devices Inc.
IC REG CTRLR BUCK-BOOST 28
Raktáron3906 pcs
Current Limit, Frequency Control, Soft Start
1
95%
Yes
Yes
-
Buck-Boost
LT8390
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Up/Step-Down
645kHz ~ 2.1MHz
1
Positive
4V ~ 60V
RFQ
LM5642MTCX
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
Raktáron13084 pcs
Current Limit, Enable, Soft Start
2
98.9%
Yes
Yes
-
Buck
LM5642
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173', 4.40mm Width)
28-TSSOP
Step-Down
200kHz
2
Positive
4.5V ~ 36V
RFQ
LM2657MTCX
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
Raktáron9370 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
2
70%
Yes
No
-
Buck
LM2657
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173', 4.40mm Width)
28-TSSOP
Step-Down
200kHz ~ 500kHz
2
Positive
4.5V ~ 28V
RFQ
MIC2183BQS
Microchip Technology
IC REG CTRLR BUCK 16QSOP
Raktáron6240 pcs
Enable, Frequency Control, Soft Start
1
100%
Yes
Yes
-
Buck
MIC2183
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-QSOP
Step-Down
200kHz, 400kHz
1
Positive
2.9V ~ 14V
RFQ
IR3565AMFC01TRP
Infineon Technologies
IC REG BUCK 48VQFN
Raktáron13990 pcs
Enable, Power Good
4
-
No
No
I²C, PMBus, SMBus
Buck
IR3565
Tape & Reel (TR)
PWM
-
-40°C ~ 85°C (TA)
Surface Mount
48-VFQFN Exposed Pad
PG-VQFN-48-900
Step-Down
200kHz ~ 2MHz
6
Positive
3.3V
RFQ
MAX15569GTG+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK I2C 24TQFN
Raktáron4100 pcs
Enable, On Time Control
2
-
No
No
I²C
Buck
MAX15569
Tape & Reel (TR)
PWM Signal
-
-40°C ~ 105°C (TA)
Surface Mount
24-WFQFN Exposed Pad
24-TQFN (4x4)
Step-Down
600kHz ~ 1.4MHz
2
Positive
4.75V ~ 5.25V
RFQ
MIC2176-3YMM
Microchip Technology
IC REG CTRLR BUCK 10MSOP
Raktáron18764 pcs
Enable
1
89%
Yes
No
-
Buck
MIC2176
Tube
Transistor Driver
Hyper Speed Control®
-40°C ~ 125°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-MSOP
Step-Down
300kHz
1
Positive
4.5V ~ 75V
RFQ
LM5642XMT
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
Raktáron7880 pcs
Current Limit, Enable, Soft Start
2
98.9%
Yes
Yes
-
Buck
LM5642
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173', 4.40mm Width)
28-TSSOP
Step-Down
375kHz
2
Positive
4.5V ~ 36V
RFQ
LV5044V-TLM-E
onsemi
IC REG CTRLR BUCK 30SSOP
Raktáron3840 pcs
Current Limit, Power Good, Soft Start
2
82%
Yes
No
-
Buck
LV5044
Tape & Reel (TR)
Transistor Driver
-
-20°C ~ 85°C (TA)
Surface Mount
30-LSSOP (0.220", 5.60mm Width)
30-SSOP
Step-Down
250kHz ~ 1.1MHz
2
Positive
4.5V ~ 16V
RFQ
LT8390IUFD#PBF
Analog Devices Inc.
IC REG CTRLR BUCK/BOOST 28QFN
Raktáron4139 pcs
Current Limit, Frequency Control, Soft Start
1
95%
Yes
Yes
-
Buck-Boost
LT8390
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Up/Step-Down
190kHz ~ 630kHz
1
Positive
4V ~ 60V
RFQ
UC2823Q
Texas Instruments
IC REG CTRLR MULT TOP 20PLCC
Raktáron14510 pcs
Current Limit, Enable, Frequency Control, Ramp, Soft Start
1
80%
No
No
-
Buck, Boost, Flyback, Forward Converter
UC2823
Tube
Transistor Driver
-
-25°C ~ 85°C (TA)
Surface Mount
20-LCC (J-Lead)
20-PLCC (9x9)
Step-Up, Step-Down, Step-Up/Step-Down
340kHz ~ 460kHz
1
Positive
8.4V ~ 30V
RFQ