SG3525ADWR2G
onsemi
IC REG CTRLR PUSH-PULL 16SOIC
vorrätig33250 pcs
Enable, Frequency Control, Soft Start
1
49%
Yes
Yes
-
Push-Pull
SG3525
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.295", 7.50mm Width)
16-SOIC
Step-Up/Step-Down
100Hz ~ 400kHz
2
Positive
8V ~ 35V
RFQ
MAX8743ETX+T
Analog Devices Inc./Maxim Integrated
IC INTEGRATED CIRCUIT
vorrätig8020 pcs
Current Limit, Enable, On Time Control, Power Good, Pulse Skipping
1
-
Yes
No
-
Buck
MAX8743
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
36-WFQFN Exposed Pad
36-TQFN (6x6)
Step-Down
200kHz, 300kHz, 420kHz, 540kHz
2
Positive
2V ~ 28V
RFQ
LTC3801BES6#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK TSOT23-6
vorrätig11873 pcs
Current Limit, Enable
1
100%
No
No
-
Buck
LTC3801
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6 Thin, TSOT-23-6
TSOT-23-6
Step-Down
550kHz
1
Positive
2.4V ~ 9.8V
RFQ
LTC1922IG-1#TRPBF
Analog Devices Inc.
IC REG CTRLR FULL-BRIDGE 20SSOP
vorrätig2797 pcs
Ramp, Soft Start
1
99%
Yes
Yes
-
Full-Bridge
LTC1922
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
20-SSOP (0.209", 5.30mm Width)
20-SSOP
Step-Up/Step-Down
Up to 1MHz
1
Positive, Isolation Capable
3.8V ~ 10.3V
RFQ
LTC3703IGN-5#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
vorrätig4593 pcs
Current Limit, Enable, Frequency Control, Soft Start
1
93%
Yes
Yes
-
Buck
LTC3703
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
100kHz ~ 600kHz
1
Positive
4.1V ~ 15V
RFQ
NCV885201D1R2G
onsemi
IC REG CTRLR BUCK 8SOIC
vorrätig24520 pcs
Current Limit, Enable, Frequency Control
1
93%
No
Yes
-
Buck
NCV885201
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 150°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
100kHz ~ 500kHz
1
Positive
3.1V ~ 40V
RFQ
NCP1583DR2G
onsemi
IC REG CTRLR BUCK 8SOIC
vorrätig7420 pcs
Enable, Phase Control
1
75%
Yes
No
-
Buck
NCP1583
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
300kHz
1
Positive
4.5V ~ 13.2V
RFQ
MP8666DN-LF-Z
Monolithic Power Systems Inc.
IC REG CTRLR BUCK 8SOIC
vorrätig12896 pcs
Enable
1
90%
No
Yes
-
Buck
MP8666
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width) Exposed Pad
8-SOICE
Step-Down
600kHz
1
Positive
4.5V ~ 21V
RFQ
LTC1649CS#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SOIC
vorrätig6378 pcs
Current Limit, Enable, Soft Start
1
93%
Yes
No
-
Buck
LTC1649
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SO
Step-Down
200kHz
1
Positive
2.7V ~ 5V
RFQ
TL494CDG
onsemi
IC REG CTRLR BCK/PSH-PULL 16SOIC
vorrätig5260 pcs
Dead Time Control, Frequency Control
1
48%
Yes
No
-
Buck, Push-Pull
TL494
Tube
Transistor Driver
SWITCHMODE™
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Down, Step-Up/Step-Down
200kHz
2
Positive
7V ~ 40V
RFQ
ISL6224CAZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 16SSOP
vorrätig11200 pcs
Enable, Phase Control, Power Good, Soft Start
1
94%
Yes
No
-
Buck
ISL6224
Tape & Reel (TR)
Transistor Driver
-
-10°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-QSOP
Step-Down
300kHz, 600kHz
1
Positive
4.75V ~ 5.25V
RFQ
UC2845D
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
vorrätig39080 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC2845
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
12V ~ 28V
RFQ
S-8338ABHB-P8T1G
ABLIC Inc.
IC REG CTRLR BOOST 8SON
vorrätig69250 pcs
Current Limit, Enable, Frequency Control
1
88.5%
No
No
-
Boost
S-8338
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SMD, Flat Lead
8-SON (A) (2.9x2.8)
Step-Up
257.4kHz ~ 1.134MHz
1
Positive
1.8V ~ 6V
RFQ
UCC2800DTR
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
vorrätig35805 pcs
Frequency Control
1
99%
No
No
-
Boost, Flyback, Forward Converter
UCC2800
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
46kHz
1
Positive
6.9V ~ 12V
RFQ
ISL6558IRZ-TK
Renesas Electronics America Inc
IC REG CTRLR BUCK 20QFN
vorrätig10763 pcs
Enable, Frequency Control, Power Good
4
75%
-
No
-
Buck
ISL6558
Tape & Reel (TR)
PWM Signal
-
-40°C ~ 85°C (TA)
Surface Mount
20-VQFN Exposed Pad
20-QFN (5x5)
Step-Down
80kHz ~ 1.5MHz
4
Positive
4.75V ~ 5.25V
RFQ
KA7500B
onsemi
IC REG CTRLR BUCK 16DIP
vorrätig6640 pcs
Dead Time Control
1
45%
Yes
No
-
Buck
KA7500
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Through Hole
16-DIP (0.300', 7.62mm)
16-PDIP
Step-Down
1kHz ~ 300kHz
1
Positive
7V ~ 42V
RFQ
LM2576S-ADJ
Texas Instruments
SWITCHING REGULATOR, VOLTAGE-MOD
vorrätig12250 pcs
-
-
-
-
-
-
-
LM2576
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UC3845ADM
Microsemi Corporation
IC REG CTRLR BUCK/BOOST 8SOIC
vorrätig16580 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC3845
Bulk
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Down
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
MAX1876EEG+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 24QSOP
vorrätig5356 pcs
Current Limit, Enable, Frequency Control, Reset
2
-
Yes
Yes
-
Buck
MAX1876
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-QSOP
Step-Down
100kHz ~ 600kHz
2
Positive
4.75V ~ 23V
RFQ
MAX772CSA+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BOOST 8SOIC
vorrätig7203 pcs
Enable
1
-
No
No
-
Boost
MAX772
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up
300kHz
1
Positive
3V ~ 16.5V
RFQ
LTC1874EGN#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
vorrätig5848 pcs
Enable
1
100%
No
No
-
Buck
LTC1874
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
550kHz
2
Positive
2.5V ~ 9.8V
RFQ
ISL6420BIRZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 20QFN
vorrätig11675 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 ~ 28V
RFQ
TPS64201DBVR
Texas Instruments
IC REG CTRLR BUCK SOT23-6
vorrätig60590 pcs
Enable
1
100%
No
No
-
Buck
TPS64201
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6
SOT-23-6
Step-Down
-
1
Positive or Negative
1.8V ~ 6.5V
RFQ
LT1683EG#PBF
Analog Devices Inc.
IC REG CTRLR PUSH-PULL 20SSOP
vorrätig3380 pcs
Enable, Frequency Control, Soft Start
1
46%
No
Yes
-
Push-Pull
LT1683
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-SSOP (0.209', 5.30mm Width)
20-SSOP
Step-Up/Step-Down
250kHz
1
Positive and Negative
7.3V ~ 20V
RFQ
ISL9502CRZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 48QFN
vorrätig9470 pcs
Current Limit, Power Good
2
-
Yes
No
-
Buck
ISL9502
Tube
Transistor Driver
Robust Ripple Regulator™ (R3)
-10°C ~ 100°C (TA)
Surface Mount
48-VFQFN Exposed Pad
48-QFN (7x7)
Step-Down
200kHz ~ 500kHz
2
Positive
4.75V ~ 5.25V
RFQ
ISL6529CB-T
Intersil
SWITCHING CONTROLLER, VOLTAGE-MO
vorrätig31320 pcs
-
-
-
-
-
-
-
ISL6529
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
LTC3827IUH#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
vorrätig2992 pcs
Enable, Phase Control, Power Good, Soft Start, Tracking
2
99.4%
Yes
No
-
Buck
LTC3827
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
250kHz ~ 530kHz
2
Positive
4V ~ 36V
RFQ
LM5141QRGERQ1
Texas Instruments
IC REG CTRLR BUCK 24VGFN
vorrätig10544 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
1
-
No
No
-
Buck
LM5141
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 150°C (TJ)
Surface Mount
24-VFQFN Exposed Pad
24-VQFN (4x4)
Step-Down
440kHz, 2.2MHz
1
Positive
3.8V ~ 65V
RFQ
SC4508AMLTRT
Semtech Corporation
IC REG CTRLR BUCK/BCK-BST 12MLPQ
vorrätig31372 pcs
Enable, Frequency Control, Soft Start
1
97%
No
No
-
Buck, Buck-Boost
SC4508
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
12-VQFN Exposed Pad
12-MLPQ (4x4)
Step-Down, Step-Up/Step-Down
100kHz ~ 1.5MHz
1
Positive
2.7V ~ 15V
RFQ
UCC3807D-1
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
vorrätig9734 pcs
-
1
78%
No
No
-
Buck, Boost, Flyback, Forward Converter, SEPIC
UCC3807
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
202kHz
1
Positive
6.9V ~ 13.5V
RFQ
LTC3731CG#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 36SSOP
vorrätig4560 pcs
Enable, Phase Control, Power Good, Soft Start
3
98.5%
Yes
No
-
Buck
LTC3731
Tube
Transistor Driver
PolyPhase®
0°C ~ 70°C (TA)
Surface Mount
36-SSOP (0.209', 5.30mm Width)
36-SSOP
Step-Down
225kHz ~ 680kHz
3
Positive
3.8V ~ 7V
RFQ
ISL6722AARZ
Renesas Electronics America Inc
IC REG CTRLR BOOST/FLYBACK 16QFN
vorrätig11591 pcs
Current Limit, Frequency Control, Soft Start
1
75%
No
Yes
-
Boost, Flyback
ISL6722
Tube
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-VFQFN Exposed Pad
16-QFN (3x3)
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive, Isolation Capable
9V ~ 18V
RFQ
LTC3855EUJ#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 40QFN
vorrätig8214 pcs
Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
2
95%
Yes
No
-
Buck
LTC3855
Tube
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
40-WFQFN Exposed Pad
40-QFN (6x6)
Step-Down
250kHz ~ 770kHz
2
Positive
4.5V ~ 38V
RFQ
UC2843AD
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
vorrätig71890 pcs
Frequency Control
1
96%
No
No
-
Boost, Buck, Flyback, Forward
UC2843
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
UC2843BD1R2G
onsemi
IC REG CTRLR FLYBACK 8SOIC
vorrätig111310 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC2843
Tape & Reel (TR)
Transistor Driver
-
-25°C ~ 85°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
7.6V ~ 30V
RFQ
LM3477MM
Texas Instruments
IC REG CTRLR BUCK/BCK-BST 8VSSOP
vorrätig15300 pcs
Enable
1
93%
No
No
-
Buck, Buck-Boost
LM3477
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
8-TSSOP, 8-MSOP (0.118', 3.00mm Width)
8-VSSOP
Step-Down
500kHz
1
Positive
2.97V ~ 35V
RFQ
UC3845BDR2G
onsemi
IC REG CTRLR BOOST/FLYBK 14SOIC
vorrätig77920 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC3845
Tape & Reel (TR)
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
7.6V ~ 30V
RFQ
LT3758EDD#PBF
Analog Devices Inc.
IC REG CTRLR MULT TOPOLOGY 10DFN
vorrätig7646 pcs
Enable, Frequency Control, Soft Start
1
-
No
Yes
-
Boost, Flyback, SEPIC
LT3758
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
10-WFDFN Exposed Pad
10-DFN (3x3)
Step-Up, Step-Up/Step-Down
100kHz ~ 1MHz
1
Positive or Negative, Isolation Capable
5.5V ~ 100V
RFQ
UC2844AQDR
Texas Instruments
IC CURR-MODE PWM CTLR 14-SOIC
vorrätig56590 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC2844
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 30V
RFQ
TL594CN
onsemi
IC REG CTRLR BCK/PUSH-PULL 16DIP
vorrätig13560 pcs
Dead Time Control, Frequency Control
1
96%
Yes
No
-
Buck, Push-Pull
TL594
Tube
Transistor Driver
SWITCHMODE™
-40°C ~ 85°C (TA)
Through Hole
16-DIP (0.300", 7.62mm)
16-PDIP
Step-Down, Step-Up/Step-Down
300kHz
2
Positive
7V ~ 40V
RFQ
LTC1773EMS#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 10MSOP
vorrätig9708 pcs
Enable, Soft Start
1
100%
Yes
Yes
-
Buck
LTC1773
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-MSOP
Step-Down
550kHz
1
Positive
2.65V ~ 8.5V
RFQ
MAX651CSA
Analog Devices Inc./Maxim Integrated
STEP-DOWN DC-DC CONTROLLER
vorrätig18066 pcs
Enable
1
-
No
No
-
Buck
MAX651
Bulk
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
Up to 300kHz
1
Positive
4V ~ 16.5V
RFQ
LTC3703HGN#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
vorrätig6602 pcs
Current Limit, Enable, Frequency Control, Soft Start
1
93%
Yes
Yes
-
Buck
LTC3703
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 150°C (TJ)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
100kHz ~ 600kHz
1
Positive
9.3V ~ 15V
RFQ
UC2844BNG
onsemi
IC REG CTRLR PWM CM 8-DIP
vorrätig86440 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC2844
Tube
Transistor Driver
-
-25°C ~ 85°C (TA)
Through Hole
8-DIP (0.300', 7.62mm)
8-PDIP
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 36V
RFQ
UCC3813DTR-5
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
vorrätig37333 pcs
Frequency Control
1
49%
No
No
-
Boost, Flyback, Forward Converter
UCC3813
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
31kHz
1
Positive
3.6V ~ 12V
RFQ
TL1453CD
Texas Instruments
IC REG CTRLR 16SOIC
vorrätig14761 pcs
Dead Time Control, Frequency Control
1
-
No
No
-
Boost
TL1453
Tube
PWM
-
-20°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
-
1kHz ~ 500kHz
2
Positive
3.6V ~ 40V
RFQ
MAX16932ATIR/V+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 28TQFN
vorrätig2594 pcs
Enable, Frequency Control, Power Good
2
98.5%
Yes
Yes
-
Buck
MAX16932
Tube
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-TQFN (5x5)
Step-Down
1MHz ~ 2.2MHz
2
Positive
3.5V ~ 42V
RFQ
SP6134HEU-L/TR
MaxLinear, Inc.
IC REG CTRLR BUCK 10MSOP
vorrätig35896 pcs
Soft Start
1
100%
Yes
No
-
Buck
SP6134
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-MSOP
Step-Down
600kHz
1
Positive
3V ~ 28V
RFQ
TL3842DRE4-8
Texas Instruments
IC REG CTRLR BST FLYBK PWM 8SOIC
vorrätig98420 pcs
Frequency Control
1
97%
No
No
-
Boost, Flyback, Forward
TL3842
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive
10V ~ 30V
RFQ
LTC3809EDD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 10DFN
vorrätig8555 pcs
Enable
1
100%
Yes
Yes
-
Buck
LTC3809
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-WFDFN Exposed Pad
10-DFN (3x3)
Step-Down
460kHz ~ 635kHz
1
Positive
2.75V ~ 9.8V
RFQ