LTC3813EG#TRPBF
Analog Devices Inc.
IC REG CTRLR BOOST 28SSOP
In magazzino4357 pcs
Enable, Power Good, Soft Start
1
-
Yes
Yes
-
Boost
LTC3813
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
28-SSOP (0.209", 5.30mm Width)
28-SSOP
Step-Up
-
1
Positive
6.35V ~ 14V
RFQ
HIP5020DB
Intersil
IC REG LINEAR SWITCHING REG
In magazzino8296 pcs
Current Limit, Frequency Control, Phase Control, Ramp, Soft Start
1
-
Yes
Yes
-
Buck
HIP5020
Bulk
Transistor Driver
-
0°C ~ 70°C
Surface Mount
28-SOIC (0.295", 7.50mm Width)
28-SOIC
Step-Down
100kHz ~ 1MHz
1
Half Bridge (3)
4.5V ~ 18V
RFQ
UC2843AQD8R
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
In magazzino58530 pcs
Frequency Control
1
96%
No
No
-
Boost, Buck, Flyback, Forward
UC2843
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
NCV3011DTBR2G
onsemi
IC REG CTRLR BUCK 14TSSOP
In magazzino41250 pcs
Current Limit, Dead Time Control, Enable, Power Good, Power On Reset, Ramp, Slew Control, Soft Start
1
83%
Yes
Yes
-
Buck
NCV3011
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 140°C (TJ)
Surface Mount
14-TSSOP (0.173", 4.40mm Width)
14-TSSOP
Step-Down
400kHz
1
Positive
4.7V ~ 28V
RFQ
LT1681ISW#PBF
Analog Devices Inc.
IC SYNCHRONOUS FWRD CTRLR 20SOIC
In magazzino3497 pcs
-
-
-
-
-
-
-
LT1681
Tube
-
-
-40°C ~ 85°C
Surface Mount
20-SOIC (0.295", 7.50mm Width)
20-SO
-
-
-
-
-
RFQ
UC2845ADM
Microchip Technology
IC REG CTRLR BUCK/BOOST 8SOIC
In magazzino5845 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC2845
Bulk
Transistor Driver
-
-40°C ~ 85°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
ISL8105IRZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 10DFN
In magazzino23725 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
ISL8105
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-VFDFN Exposed Pad
10-DFN (3x3)
Step-Down
300kHz
1
Positive
6.5V ~ 14.4V
RFQ
AP2004SG-13
Diodes Incorporated
IC REG CTRLR BUCK 8SOIC
In magazzino8810 pcs
Soft Start
1
-
No
No
-
Buck
AP2004
Tape & Reel (TR)
Transistor Driver
-
-20°C ~ 125°C (TJ)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOP
Step-Down
10kHz ~ 300kHz
1
Positive
3.6V ~ 27V
RFQ
TPS53126RGER
Texas Instruments
IC REG CTRLR BUCK 24VQFN
In magazzino18918 pcs
Enable, Frequency Control
1
-
Yes
No
-
Buck
TPS53126
Tape & Reel (TR)
Transistor Driver
D-CAP2™
-40°C ~ 85°C (TA)
Surface Mount
24-VFQFN Exposed Pad
24-VQFN (4x4)
Step-Down
350kHz, 700kHz
2
Positive
4.5V ~ 24V
RFQ
LM5176QPWPRQ1
Texas Instruments
IC POWER REGULATOR
In magazzino7715 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
1
-
Yes
Yes
-
Buck-Boost
LM5176
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
28-PowerTSSOP (0.173", 4.40mm Width)
28-HTSSOP
Step-Up/Step-Down
100kHz ~ 600kHz
1
Positive
4.2V ~ 55V
RFQ
MAX5019ESA-T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR FLYBACK 8SOIC
In magazzino15760 pcs
Enable, Soft Start
1
85%
No
No
-
Flyback
MAX5019
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up/Step-Down
275kHz
1
Positive, Isolation Capable
13V ~ 36V
RFQ
LT1683EG#TRPBF
Analog Devices Inc.
IC REG CTRLR PUSH-PULL 20SSOP
In magazzino4862 pcs
Enable, Frequency Control, Soft Start
1
46%
No
Yes
-
Push-Pull
LT1683
Tape & Reel (TR)
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
IFX80471SKV
Infineon Technologies
IFX80471 - SWITCHING REGULATORS
In magazzino8770 pcs
Enable, Reset
1
100%
Yes
Yes
-
Buck
IFX80471
Bulk
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
PG-DSO-14
Step-Down
360kHz
1
Positive
5V ~ 60V
RFQ
TL2843BD
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
In magazzino68970 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback, Forward
TL2843
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive
7.6V ~ 30V
RFQ
TL494BDR2G
onsemi
IC REG CTRLR BCK/PSH-PULL 16SOIC
In magazzino95210 pcs
Dead Time Control, Frequency Control
1
48%
Yes
No
-
Buck, Push-Pull
TL494
Tape & Reel (TR)
Transistor Driver
SWITCHMODE™
-40°C ~ 125°C (TJ)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
Step-Down, Step-Up/Step-Down
200kHz
2
Positive
7V ~ 40V
RFQ
SP6128ASEY-L
MaxLinear, Inc.
IC REG CTRLR BUCK 14TSSOP
In magazzino16930 pcs
Current Limit
1
90%
Yes
No
-
Buck
SP6128
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-TSSOP (0.173', 4.40mm Width)
14-TSSOP
Step-Down
300kHz
1
Positive
3V ~ 5.5V
RFQ
LT3757IDD
Analog Devices Inc.
IC REG CTRLR MULT TOPOLOGY 10DFN
In magazzino11330 pcs
Enable, Frequency Control, Soft Start
1
-
No
Yes
-
Boost, Flyback, SEPIC
LT3757
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 and Negative
2.9V ~ 40V
RFQ
LTC3736EGN#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 24SSOP
In magazzino7252 pcs
Current Limit, Enable, Power Good, Soft Start, Tracking
2
100%
Yes
Yes
-
Buck
LTC3736
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-SSOP
Step-Down
300kHz ~ 750kHz
2
Positive
2.75V ~ 9.8V
RFQ
ADP3042ARUZ-REEL7
Analog Devices Inc.
IC REG CTRLR BOOST 29TSSOP
In magazzino12620 pcs
-
-
-
-
-
-
-
ADP3042
Bulk
-
*
-
Surface Mount
28-TSSOP (0.173", 4.40mm Width)
28-TSSOP
-
-
-
-
-
RFQ
LT1241CS8#PBF
Linear Technology
LT1241 - CURRENT MODE PWM CONTRO
In magazzino6500 pcs
Dead Time Control, Frequency Control
1
48%
No
Yes
-
Buck
LT1241
Bulk
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
7.6V ~ 25V
RFQ
UCC2805DTR
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
In magazzino32260 pcs
Frequency Control
1
49%
No
No
-
Boost, Flyback, Forward Converter
UCC2805
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
31kHz
1
Positive
3.6V ~ 12V
RFQ
LTC1149CS-5#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SOIC
In magazzino5159 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
LTC1149
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SO
Step-Down
Up to 250kHz
1
Positive
Up to 48V
RFQ
LTC3833IUDC#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 20QFN
In magazzino6692 pcs
Enable, Frequency Control, Power Good, Soft Start, Tracking
1
-
Yes
No
-
Buck
LTC3833
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-WFQFN Exposed Pad
20-QFN (3x4)
Step-Down
200kHz ~ 2MHz
1
Positive
4.5V ~ 38V
RFQ
MAX863EEE-T
Analog Devices Inc./Maxim Integrated
PFM STEP-UP DC-DC CONTROLLER
In magazzino7281 pcs
Current Limit, Enable, Frequency Control
1
-
No
No
-
Boost
MAX863
Bulk
Transistor Driver
-
-40°C ~ 85°C
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-QSOP
Step-Down
-
1
Positive
1.5V ~ 11V
RFQ
BD9011KV-E2
Rohm Semiconductor
IC REG CTRLR BUCK 48VQFP
In magazzino8925 pcs
Enable, Frequency Control, Soft Start
1
-
Yes
Yes
-
Buck
BD9011
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
48-LQFP
48-VQFPC (7x7)
Step-Down
300kHz
2
Positive
3.9V ~ 30V
RFQ
ISL6558CBZ
Intersil
SWITCHING CONTROLLER
In magazzino20998 pcs
Enable, Frequency Control, Phase Control, Power Good, Soft Start
4
75%
Yes
No
-
Buck
ISL6558
Bulk
PWM Signal
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
Step-Down
80kHz ~ 1.5MHz
4
Positive
4.75V ~ 5.25V
RFQ
UC2842ANG
onsemi
IC REG CTRLR FLYBK ISO PWM 8-DIP
In magazzino7900 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC2842
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 ~ 30V
RFQ
CHL8103-17CRT
Infineon Technologies
IC REG BUCK 40VQFN
In magazzino8770 pcs
Enable, Power Good
3
-
No
No
I²C
Buck
CHL8103
Tape & Reel (TR)
PWM
-
0°C ~ 85°C
Surface Mount
40-VFQFN Exposed Pad
PG-VQFN-40-903
Step-Down
200kHz ~ 1.2MHz
4
Positive
3.3V
RFQ
NCP5217AMNTXG
onsemi
IC REG CTRLR BUCK 14-QFN
In magazzino15440 pcs
Enable, Power Good
1
-
Yes
No
-
Buck
NCP5217
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-VFQFN Exposed Pad
14-QFN (3.5x3.5)
Step-Down
300kHz
1
Positive
4.5V ~ 27V
RFQ
MAX799CSE
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 16SOIC
In magazzino5717 pcs
-
-
-
-
-
-
-
MAX799
Tube
-
*
-
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
-
-
-
-
-
RFQ
MCP19115T-E/MQ
Microchip Technology
IC REG CTRLR MULT TOP I2C 28QFN
In magazzino10002 pcs
-
1
-
No
No
I²C
Boost, Cuk, Flyback, SEPIC
MCP19115
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
28-VFQFN Exposed Pad
28-QFN (5x5)
Step-Up, Step-Up/Step-Down
31.25kHz ~ 2MHz
1
Positive
4.5V ~ 42V
RFQ
UC3842AD8TR
Texas Instruments
IC REG CTRLR PWM CM 8SOIC
In magazzino75000 pcs
Frequency Control
1
96%
No
No
-
Boost, Buck, Flyback, Forward
UC3842
Tape & Reel (TR)
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
10V ~ 30V
RFQ
L6725TR
STMicroelectronics
IC REG CTRLR BUCK 16SOIC
In magazzino17920 pcs
Current Limit, Phase Control, Power Good, Soft Start
1
100%
Yes
Yes
-
Buck
L6725
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SO
Step-Down
250kHz, 500kHz
1
Positive
4.5V ~ 18V
RFQ
RT8209AGQW
Richtek USA Inc.
IC REG CTRLR BUCK 16WQFN
In magazzino10700 pcs
Current Limit, Enable, On Time Control, Phase Control, Power Good
1
-
Yes
No
-
Buck
RT8209
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-WFQFN Exposed Pad
16-WQFN (3x3)
Step-Down
-
1
Positive
4.5V ~ 5.5V
RFQ
TPS51113DRCT
Texas Instruments
IC REG CTRLR BUCK 10SON
In magazzino18668 pcs
Enable, Power Good
1
72%
Yes
No
-
Buck
TPS51113
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-VFDFN Exposed Pad
10-VSON (3x3)
Step-Down
300kHz
1
Positive
4.5V ~ 13.2V
RFQ
NCP5383MNR2G
onsemi
IC REG CTRLR BUCK 24QFN
In magazzino7000 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
2
-
Yes
No
-
Buck
NCP5383
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
24-VFQFN Exposed Pad
24-QFN (4x4)
Step-Down
100kHz ~ 400kHz
2
Positive
4.5V ~ 13.2V
RFQ
UCC3813PWTR-5
Texas Instruments
IC REG CTRLR MULT TOP 8TSSOP
In magazzino44839 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-TSSOP (0.173", 4.40mm Width)
8-TSSOP
Step-Up, Step-Up/Step-Down
31kHz
1
Positive
3.6V ~ 12V
RFQ
LM5642MTC
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
In magazzino11370 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
200kHz
2
Positive
4.5V ~ 36V
RFQ
LTC3731IUH#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
In magazzino4515 pcs
Enable, Phase Control, Power Good, Soft Start
3
98.5%
Yes
No
-
Buck
LTC3731
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
225kHz ~ 680kHz
3
Positive
3.8V ~ 7V
RFQ
LT1619ES8#PBF
Analog Devices Inc.
IC REG CTRLR MULT TOPOLOGY 8SOIC
In magazzino9119 pcs
Enable
1
92%
No
Yes
-
Boost, Cuk, Flyback, SEPIC
LT1619
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SO
Step-Up, Step-Up/Step-Down
300kHz
1
Positive, Isolation Capable
1.9V ~ 18V
RFQ
LTC1702AIGN#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 24SSOP
In magazzino3080 pcs
Current Limit, Enable, Power Good, Soft Start
2
90%
Yes
No
-
Buck
LTC1702
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-SSOP
Step-Down
550kHz
2
Positive
3V ~ 7V
RFQ
UC3825ADWTRG4
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
In magazzino8120 pcs
Current Limit, Frequency Control, Ramp, Soft Start
1
50%
No
No
-
Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
UC3825
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.295", 7.50mm Width)
16-SOIC
Step-Up, Step-Up/Step-Down
400kHz ~ 1MHz
2
Positive
8.4V ~ 22V
RFQ
MCP19118-E/MJ
Microchip Technology
IC REG CTRLR BUCK PMBUS 24QFN
In magazzino8476 pcs
Phase Control
1
-
Yes
No
I²C, PMBus, SMBus
Buck
MCP19118
Tube
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
24-VFQFN Exposed Pad
24-QFN (4x4)
Step-Down
100kHz ~ 1.6MHz
1
Positive
4.5V ~ 40V
RFQ
L6727TR
STMicroelectronics
IC REG CTRLR BUCK 8SOIC
In magazzino28819 pcs
Enable, Phase Control
1
80%
Yes
No
-
Buck
L6727
Tape & Reel (TR)
Transistor Driver
-
-20°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
300kHz
1
Positive
4.1V ~ 13.2V
RFQ
LTC3807EUDC#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 20QFN
In magazzino10069 pcs
Current Limit, Enable, Frequency Control, Soft Start, Tracking
1
99%
Yes
No
-
Buck
LTC3807
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-WFQFN Exposed Pad
20-QFN (3x4)
Step-Down
50kHz ~ 900kHz
1
Positive
4V ~ 38V
RFQ
ISL6744ABZ-T
Renesas Electronics America Inc
IC REG CTRLR MULT TOPOLOGY 8SOIC
In magazzino10490 pcs
Frequency Control, Soft Start
1
99%
Yes
No
-
Full-Bridge, Half-Bridge
ISL6744
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up/Step-Down
Up to 1MHz
1
Positive, Isolation Capable
9V ~ 16V
RFQ
ISL8840AMBZ-T
Renesas Electronics America Inc
IC REG CTRLR BOOST/FLYBACK 8SOIC
In magazzino10220 pcs
Current Limit, Frequency Control
1
96%
No
No
-
Boost, Flyback
ISL8840
Tape & Reel (TR)
Transistor Driver
-
-55°C ~ 125°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 2MHz
1
Positive, Isolation Capable
9V ~ 30V
RFQ
S-8521F30MC-BPPT2G
ABLIC Inc.
IC REG CTRLR BUCK SOT23-5
In magazzino84170 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
LTC3854EMSE#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 12MSOP
In magazzino15272 pcs
Enable, Soft Start
1
98%
Yes
No
-
Buck
LTC3854
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
12-TSSOP (0.118', 3.00mm Width) Exposed Pad
12-MSOP-EP
Step-Down
400kHz
1
Positive
4.5V ~ 38V
RFQ
TL494IN
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 16DIP
In magazzino164030 pcs
Dead Time Control, Frequency Control
1
45%
No
No
-
Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
TL494
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Through Hole
16-DIP (0.300', 7.62mm)
16-PDIP
Step-Up, Step-Down, Step-Up/Step-Down
1kHz ~ 300kHz
2
Positive
7V ~ 40V
RFQ