LT1241CS8#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 8SOIC
vorrätig8110 pcs
Frequency Control
1
48%
No
No
-
Buck
LT1241
Tube
Transistor Driver
-
0°C ~ 100°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SO
Step-Down
500kHz
1
Positive, Isolation Capable
8.2V ~ 25V
RFQ
MAX1655EEE+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 16QSOP
vorrätig6974 pcs
Enable, Soft Start
1
98%
Yes
Yes
-
Buck
MAX1655
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-QSOP
Step-Down
150kHz, 300kHz
1
Positive
4.5V ~ 30V
RFQ
MIC2182YM-TR
Microchip Technology
IC REG CTRLR BUCK 16SOIC
vorrätig9409 pcs
Enable, Soft Start
1
86%
Yes
Yes
-
Buck
MIC2182
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Down
300kHz
1
Positive
4.5V ~ 32V
RFQ
ISL6722AARZ-T
Intersil
SWITCHING REGULATOR, VOLTAGE-MOD
vorrätig12240 pcs
Current Limit, Frequency Control, Soft Start
1
75%
No
Yes
-
Boost, Flyback
ISL6722
Bulk
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
MAX1716EEG+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 24QSOP
vorrätig4810 pcs
Current Limit, Enable, On Time Control
1
100%
Yes
No
-
Buck
MAX1716
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-QSOP
Step-Down
200kHz, 300kHz, 400kHz, 550kHz
1
Positive
2V ~ 28V
RFQ
MAX774CSA+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK-BOOST 8SOIC
vorrätig8409 pcs
Enable
1
-
No
No
-
Buck-Boost
MAX774
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up/Step-Down
300kHz
1
Negative
3V ~ 16.5V
RFQ
UCC2892DR
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
vorrätig29409 pcs
Current Limit, Enable, On Time Control, Ramp, Soft Start
1
70%
No
Yes
-
Flyback, Forward Converter
UCC2892
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Up/Step-Down
250kHz
1
Positive, Isolation Capable
8.5V ~ 16V
RFQ
LTC1872ES6#TRPBF
Analog Devices Inc.
IC REG CTRLR BOOST/SEPIC SOT23-6
vorrätig12942 pcs
Enable
1
-
No
No
-
Boost, SEPIC
LTC1872
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6 Thin, TSOT-23-6
TSOT-23-6
Step-Up, Step-Up/Step-Down
550kHz
1
Positive
2.5V ~ 9.8V
RFQ
ADP3182JRQZ-REEL
Analog Devices Inc.
SWITCHING CONTROLLER, VOLTAGE-MO
vorrätig41310 pcs
-
-
-
-
-
-
-
ADP3182
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
AN8018SA-E1
Panasonic Electronic Components
IC REG CTRLR BUCK/BOOST 16SSOP
vorrätig10520 pcs
Current Limit, Dead Time Control, Enable
1
77%, 80%
No
No
-
Buck, Boost
AN8018
Tape & Reel (TR)
Transistor Driver
-
-30°C ~ 85°C (TA)
Surface Mount
16-LSSOP (0.173', 4.40mm Width)
16-SSOP
Step-Up/Step-Down
20kHz ~ 1MHz
2
Positive or Negative
1.8V ~ 14V
RFQ
NCP81110MNTXG
onsemi
IC REG BUCK CTLR 48QFN
vorrätig10360 pcs
-
-
-
-
-
-
-
NCP81110
Tape & Reel (TR)
-
-
-
-
-
-
-
-
-
-
-
RFQ
UC3845AD8
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
vorrätig57060 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC3845
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
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
ISL6316CRZ
Intersil
SWITCHING CONTROLLER
vorrätig11771 pcs
Enable, Frequency Control, Power Good, Soft Start
4
66.7%
-
No
-
Buck
ISL6316
Tube
PWM Signal
-
0°C ~ 70°C (TA)
Surface Mount
40-VFQFN Exposed Pad
40-QFN (6x6)
Step-Down
80kHz ~ 1MHz
4
Positive
4.75V ~ 5.25V
RFQ
MAX668EUB
Analog Devices Inc./Maxim Integrated
IC REG CTRLR MULT TOP 10UMAX
vorrätig9100 pcs
Enable, Frequency Control
1
90%
No
Yes
-
Boost, Flyback, SEPIC
MAX668
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-uMAX/uSOP
Step-Up, Step-Up/Step-Down
100kHz ~ 500kHz
1
Positive, Isolation Capable
3V ~ 28V
RFQ
ISL6567CRZ
Intersil
SWITCHING CONTROLLER
vorrätig10892 pcs
Enable, Frequency Control, Soft Start
2
66%
Yes
No
-
Buck
ISL6567
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
24-VFQFN Exposed Pad
24-QFN (4x4)
Step-Down
200kHz ~ 2MHz
2
Positive
4.9V ~ 5.5V
RFQ
A6727TR
STMicroelectronics
IC REG CTRLR BUCK 8SOIC
vorrätig25757 pcs
Enable, Phase Control
1
80%
Yes
No
-
Buck
A6727
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
300kHz
1
Positive
4.1V ~ 13.2V
RFQ
LTC3722EGN-1#PBF
Analog Devices Inc.
IC REG CTRLR FULL-BRIDGE 24SSOP
vorrätig3353 pcs
Current Limit, Ramp, Soft Start
2
98.5%
Yes
Yes
-
Full-Bridge
LTC3722
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-SSOP
Step-Up/Step-Down
-
6
Positive, Isolation Capable
3.8V ~ 10.25V
RFQ
LTC3822EGN-1#TRPBF
Linear Technology
LTC3822-1 - ALL CHANNEL MOSFET,
vorrätig9151 pcs
Current Limit, Dead Time Control, Enable, Frequency Control, Power Good, Soft Start, Tracking
1
99%
Yes
Yes
-
Buck
LTC3822
Bulk
Transistor Driver
-
-40°C ~ 85°C
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
300kHz, 550kHz, 750kHz
1
Positive
2.75V ~ 4.5V
RFQ
MAX1845ETX
Analog Devices Inc./Maxim Integrated
STEP-DOWN CONTROLLER
vorrätig5593 pcs
Current Limit, Enable, On Time Control, Power Good
1
-
Yes
No
-
Buck
MAX1845
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 ~ 5.5V, 4.5V ~ 28V
RFQ
ISL6522BCBZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 14SOIC
vorrätig6180 pcs
Enable, Frequency Control, Phase Control, Soft Start
1
100%
Yes
No
-
Buck
ISL6522
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Down
200kHz
1
Positive
10.8V ~ 13.2V
RFQ
LTC3731HG#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 36SSOP
vorrätig4268 pcs
Enable, Phase Control, Power Good, Soft Start
3
98.5%
Yes
No
-
Buck
LTC3731
Tube
Transistor Driver
PolyPhase®
-40°C ~ 140°C (TJ)
Surface Mount
36-SSOP (0.209', 5.30mm Width)
36-SSOP
Step-Down
225kHz ~ 680kHz
3
Positive
3.8V ~ 7V
RFQ
UCC3808APWTR-2
Texas Instruments
IC REG CTRLR PUSH-PULL 8TSSOP
vorrätig17757 pcs
Frequency Control
1
49%
No
No
-
Push-Pull
UCC3808
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-TSSOP (0.173', 4.40mm Width)
8-TSSOP
Step-Up/Step-Down
194kHz
2
Positive
4.1V ~ 15V
RFQ
LTC3703IGN-5#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
vorrätig7417 pcs
Current Limit, Enable, Frequency Control, Soft Start
1
93%
Yes
Yes
-
Buck
LTC3703
Tube
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
LTC1772ES6#TRMPBF
Analog Devices Inc.
IC REG CTRLR MULT TOP SOT23-6
vorrätig7536 pcs
Enable
1
100%
No
No
-
Buck, Boost, Flyback
LTC1772
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6 Thin, TSOT-23-6
TSOT-23-6
Step-Up, Step-Down, Step-Up/Step-Down
550kHz
1
Positive
2.5V ~ 9.8V
RFQ
ZXSC410E6TA
Diodes Incorporated
IC REG CTRLR BOOST SOT23-6
vorrätig67530 pcs
Enable
1
85%
No
No
-
Boost
ZXSC410
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6
SOT-23-6
Step-Up
200kHz
1
Positive
1.8V ~ 8V
RFQ
TL594CPW
Texas Instruments
IC REG CTRLR MULT TOP 16TSSOP
vorrätig100330 pcs
Dead Time Control, Frequency Control
1
97%
No
No
-
Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
TL594
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
Step-Up, Step-Down, Step-Up/Step-Down
1kHz ~ 300kHz
2
Positive
7V ~ 40V
RFQ
UC3844BD1R2G
onsemi
IC REG CTRLR PWM CM 8-SOIC
vorrätig85230 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC3844
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, Isolation Capable
10V ~ 36V
RFQ
UCC2813D-0
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
vorrätig28468 pcs
Frequency Control
1
99%
No
No
-
Boost, Flyback, Forward Converter
UCC2813
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
-
1
Positive
6.9V ~ 12V
RFQ
NCP1560HDR2
onsemi
IC REG CTRLR FWRD CONV 16SOIC
vorrätig5160 pcs
Current Limit, Frequency Control, Ramp, Soft Start
1
80%
Yes
No
-
Forward Converter
NCP1560
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Up/Step-Down
300kHz, 480kHz
2
Positive
21.5V ~ 150V
RFQ
LT3837EFE#PBF
Analog Devices Inc.
IC REG CTRLR FLYBACK 16TSSOP
vorrätig8140 pcs
Enable, Frequency Control, On Time Control
1
88%
Yes
Yes
-
Flyback
LT3837
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
4.5V ~ 20V
RFQ
ISL6526IB
Intersil
SWITCHING CONTROLLER
vorrätig44220 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6526
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Down
600kHz
1
Positive
2.97V ~ 3.63V
RFQ
LV5052V-TLM-E
onsemi
IC REG CTRLR BUCK 30SSOP
vorrätig11390 pcs
Current Limit, Power Good, Soft Start
2
82%
Yes
No
-
Buck
LV5052
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
9.4V ~ 16V
RFQ
LT3845EFE#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16TSSOP
vorrätig5500 pcs
Enable, Frequency Control, Soft Start
1
-
Yes
Yes
-
Buck
LT3845
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-Down
300kHz
1
Positive
4V ~ 60V
RFQ
LT3758IMSE#PBF
Analog Devices Inc.
IC REG CTRLR MULT TOP 10MSOP
vorrätig8868 pcs
Enable, Frequency Control, Soft Start
1
-
No
Yes
-
Boost, Flyback, SEPIC
LT3758
Tube
Transistor Driver
-
-40°C ~ 125°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 or Negative, Isolation Capable
5.5V ~ 100V
RFQ
IR3621F
Infineon Technologies
IC REG CTRLR BUCK 28TSSOP
vorrätig5600 pcs
Frequency Control, Power Good, Soft Start
2
86.5%
Yes
Yes
-
Buck
IR3621
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173', 4.40mm Width)
28-TSSOP
Step-Down
200kHz ~ 500kHz
2
Positive
5.5V ~ 14.5V
RFQ
LM5025AMTC
Texas Instruments
IC REG CTRLR FWRD CONV 16TSSOP
vorrätig17720 pcs
Dead Time Control, Frequency Control, Ramp, Soft Start
1
80%
No
Yes
-
Forward Converter
LM5025
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
Step-Up/Step-Down
200kHz ~ 580kHz
2
Positive, Isolation Capable
8V ~ 15V
RFQ
LTC1735CGN#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
vorrätig6712 pcs
Enable, Power Good, Soft Start
1
99.4%
Yes
No
-
Buck
LTC1735
Tube
Transistor Driver
-
0°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-SSOP
Step-Down
300kHz
1
Positive
4V ~ 30V
RFQ
ISL6439IB
Renesas Electronics America Inc
IC REG CTRLR BUCK 14SOIC
vorrätig15150 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6439
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Down
300kHz
1
Positive
2.97V ~ 3.63V
RFQ
MAX1992ETG+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 24TQFN
vorrätig6350 pcs
Current Limit, Enable, On Time Control, Power Good, Pulse Skipping, Saturation
1
100%
Yes
No
-
Buck
MAX1992
Tube
Transistor Driver
Quick-PWM™
-40°C ~ 85°C (TA)
Surface Mount
24-WFQFN Exposed Pad
24-TQFN (4x4)
Step-Down
200kHz, 300kHz, 450kHz, 600kHz
1
Positive
4.5V ~ 5.5V
RFQ
BA9744FV-E2
Rohm Semiconductor
IC REG CTRLR BUCK/BOOST 16-SSOPB
vorrätig20087 pcs
Dead Time Control, Soft Start
1
100%
Yes
No
-
Buck, Boost
BA9744
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-LSSOP (0.173', 4.40mm Width)
16-SSOP-B
Step-Up, Step-Down
10kHz ~ 800kHz
2
Positive or Negative
2.5V ~ 35V
RFQ
UCC38C40DGK
Texas Instruments
IC REG CTRLR MULT TOP 8VSSOP
vorrätig24847 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback, Forward Converter
UCC38C40
Tube
Transistor Driver
-
0°C ~ 70°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
6.6V ~ 18V
RFQ
RT9214PS
Richtek USA Inc.
IC REGULATOR CONTROLLER
vorrätig17980 pcs
Phase Control
1
100%
Yes
No
-
Buck
RT9214
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOP
Step-Down
300kHz
1
Positive
5V, 12V
RFQ
LTC3860EUH#TRPBF
Linear Technology
LTC3860 - DUAL-PHASE/DUAL-CHANNE
vorrätig10342 pcs
-
-
-
-
-
-
-
LTC3860
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UC3845BDG
onsemi
IC REG CTRLR BOOST/FLYBK 14SOIC
vorrätig5410 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC3845
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
7.6V ~ 30V
RFQ
LM1770SMF
Texas Instruments
SWITCHING CONTROLLER, VOLTAGE-MO
vorrätig17850 pcs
-
1
-
Yes
No
-
Buck
LM1770
Bulk
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Down
100kHz ~ 1MHz
1
Positive
2.8V ~ 5.5V
RFQ
ISL6562CB
Intersil
SWITCHING CONTROLLER
vorrätig13939 pcs
Frequency Control, Phase Control, Power Good
2
50%
Yes
No
-
Buck
ISL6562
Bulk
PWM Signal
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
Step-Down
100kHz ~ 2MHz
2
Positive
10.8V ~ 13.2V
RFQ
LTC3871ILXE
Analog Devices Inc.
IC POWER MANAGEMENT
vorrätig7010 pcs
Current Limit, Enable, Frequency Control, Phase Control, Soft Start
Programmable
98%
Yes
Yes
-
Buck, Boost
LTC3871
Tube
Transistor Driver
PolyPhase®
-40°C ~ 125°C (TA)
Surface Mount
48-LQFP Exposed Pad
48-eLQFP (7x7)
Step-Up, Step-Down
60kHz ~ 460kHz
2
Positive
1.2V ~ 100V
RFQ
SG3525ADW
onsemi
IC REG CTRLR PUSH-PULL 16SOIC
vorrätig8090 pcs
Enable, Frequency Control, Soft Start
1
49%
Yes
Yes
-
Push-Pull
SG3525
Tube
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
LTC3862EFE-1#PBF
Analog Devices Inc.
IC REG CTRLR BOOST/SEPIC 24TSSOP
vorrätig4854 pcs
Enable, Frequency Control, Phase Control, Soft Start
2
96%
No
Yes
-
Boost, SEPIC
LTC3862
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-TSSOP (0.173', 4.40mm Width) Exposed Pad
24-TSSOP
Step-Up, Step-Up/Step-Down
75kHz ~ 500kHz
2
Positive
8.5V ~ 36V
RFQ
LM5020MM-1
Texas Instruments
IC REG CTRLR FLYBACK 10MSOP
vorrätig26071 pcs
Frequency Control, Soft Start
1
80%
No
Yes
-
Flyback
LM5020
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-VSSOP
Step-Up/Step-Down
200kHz ~ 630kHz
1
Positive
8V ~ 15V
RFQ