CAT661EVA-T3
onsemi
IC REG MULTI CONFIG 0.1A 8SOIC
Na skladě14440 pcs
-
-
-
-
-
-
-
-
-
-
-
-
CAT661
Cut Tape (CT)
-
-
*
Surface Mount
-
-
8-SOIC (0.154', 3.90mm Width)
8-SOIC
-
-
RFQ
TPS62231DRYR
Texas Instruments
IC REG BUCK 1.8V 500MA 6SON
Na skladě62330 pcs
1
Positive
Buck
1.8V
-
Yes
2.05V
3MHz
-
-
-
-
TPS62231
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
6V
Fixed
6-UFDFN
6-SON (1.45x1)
Step-Down
500mA
RFQ
NCP1402SN40T1G
onsemi
IC REG BOOST 4V 130MA 5TSOP
Na skladě11900 pcs
1
Positive
Boost
4V
-
No
0.8V
Up to 200kHz
-
-
-
-
NCP1402
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
4V
Fixed
SOT-23-5 Thin, TSOT-23-5
5-TSOP
Step-Up
130mA (Switch)
RFQ
TPS54373PWP
Texas Instruments
IC REG BUCK ADJ 3A 20HTSSOP
Na skladě9163 pcs
1
Positive
Buck
0.891V
3.3V
Yes
3V
350kHz, 550kHz
-
-
-
-
TPS54373
Tube
-40°C ~ 85°C (TA)
-
SWIFT™
Surface Mount
6V
Adjustable
20-PowerTSSOP (0.173', 4.40mm Width)
20-HTSSOP
Step-Down
3A
RFQ
RT8293AHGSP
Richtek USA Inc.
IC REG BUCK ADJUSTABLE 3A 8SOP
Na skladě7890 pcs
1
Positive
Buck
0.8V
20V
Yes
4.5V
340kHz
-
-
-
-
RT8293
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
23V
Adjustable
8-SOIC (0.154", 3.90mm Width) Exposed Pad
8-SOP-EP
Step-Down
3A
RFQ
TPS560200DBVR
Texas Instruments
IC REG BUCK ADJ 500MA SOT23-5
Na skladě100630 pcs
1
Positive
Buck
0.8V
6.5V
Yes
4.5V
600kHz
-
-
-
-
TPS560200
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
SWIFT™, D-CAP2™, Eco-Mode™
Surface Mount
17V
Adjustable
SC-74A, SOT-753
SOT-23-5
Step-Down
500mA
RFQ
AS1329A-BTTT
ams OSRAM
IC REG BOOST ADJ 850MA TSOT23-6
Na skladě16110 pcs
1
Positive
Boost
2.5V
5V
Yes
0.65V
1.2MHz
-
-
-
-
-
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5V
Adjustable
SOT-23-6 Thin, TSOT-23-6
TSOT-23-6
Step-Up
850mA (Switch)
RFQ
RT8055GQW
Richtek USA Inc.
IC REG BUCK ADJUSTABLE 3A 10WDFN
Na skladě91600 pcs
1
Positive
Buck
0.8V
5V
Yes
2.6V
300kHz ~ 2MHz
-
-
-
-
RT8055
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
10-WFDFN Exposed Pad
10-WDFN (3x3)
Step-Down
3A
RFQ
LM3674MFX-1.8
Texas Instruments
IC REG BUCK 1.8V 600MA SOT23-5
Na skladě10730 pcs
1
Positive
Buck
1.8V
-
Yes
2.7V
2MHz
-
-
-
-
LM3674
Tape & Reel (TR)
-30°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Fixed
SC-74A, SOT-753
SOT-23-5
Step-Down
600mA
RFQ
TPS563208DDCR
Texas Instruments
IC REG BUCK ADJ 3A TSOT23-6
Na skladě320340 pcs
1
Positive
Buck
0.768V
7V
Yes
4.5V
580kHz
-
-
-
-
TPS563208
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
D-CAP2™, Eco-Mode™
Surface Mount
17V
Adjustable
SOT-23-6 Thin, TSOT-23-6
SOT-23-THIN
Step-Down
3A
RFQ
MAX20010DATPR/V+T
Analog Devices Inc./Maxim Integrated
5V, 6A, BUCK CONVERTER WITH I2C
Na skladě6224 pcs
1
Positive
Buck
0.9V
-
Yes
3V
2.2MHz
-
-
-
-
MAX20010
Tape & Reel (TR)
-40°C ~ 125°C
-
Automotive, AEC-Q100
Surface Mount
5.5V
Adjustable
20-WFQFN Exposed Pad
20-TQFN (4x4)
Step-Down
6A
RFQ
ADP2116ACPZ-R7
Analog Devices Inc.
IC REG BUCK ADJ/PROG 32LFCSP
Na skladě5785 pcs
1 or 2
Positive
Buck
0.6V (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V)
5.5V
Yes
2.75V
300kHz, 600kHz, 1.2MHz
-
-
-
-
ADP2116
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
5.5V
Adjustable (Programmable)
32-WFQFN Exposed Pad, CSP
32-LFCSP-WQ (5x5)
Step-Down
6A, 3A/3A, 3A/2A
RFQ
AOZ1281DI
Alpha & Omega Semiconductor Inc.
IC REG BUCK ADJ 1.8A 8DFN
Na skladě73550 pcs
1
Positive
Buck
0.8V
22.1V
No
3V
1.5MHz
-
-
-
-
AOZ1281
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
EZBuck™
Surface Mount
26V
Adjustable
8-WFDFN Exposed Pad
8-DFN-EP (2x2)
Step-Down
1.8A
RFQ
LT1374HVCFE#PBF
Analog Devices Inc.
IC REG BUCK SEPIC ADJ 16TSSOP
Na skladě3304 pcs
1
Positive
Buck, SEPIC
2.42V
27.52V
No
5V
500kHz
-
-
-
-
LT1374
Tube
0°C ~ 125°C (TJ)
-
-
Surface Mount
32V
Adjustable
16-TSSOP (0.173', 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Down
4.5A (Switch)
RFQ
LM2576D2T-3.3G
onsemi
IC REG MULTI CONFG 3.3V D2PAK-5
Na skladě5850 pcs
1
Positive or Negative
Buck
3.3V
-
No
7V
52kHz
-
-
-
-
LM2576
Tube
-40°C ~ 125°C (TJ)
-
-
Surface Mount
40V
Fixed
TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
D2PAK-5
Step-Down
3A
RFQ
MAX766CPA+
Analog Devices Inc./Maxim Integrated
IC REG BCK BST ADJ/-15V 8DIP
Na skladě7142 pcs
1
Negative
Buck-Boost
-1V (-15V)
-16V
No
3V
300kHz
-
-
-
-
MAX766
Tube
0°C ~ 70°C (TA)
-
-
Through Hole
16V
Adjustable (Fixed)
8-DIP (0.300", 7.62mm)
8-PDIP
Step-Up/Step-Down
105mA
RFQ
AOZ3013PI
Alpha & Omega Semiconductor Inc.
IC REG BUCK ADJ 3A 8SO
Na skladě12880 pcs
1
Positive
Buck
0.8V
15.3V
Yes
4.5V
500kHz
-
-
-
-
AOZ3013
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
EZBuck™
Surface Mount
18V
Adjustable
8-SOIC (0.154", 3.90mm Width) Exposed Pad
8-SO-EP
Step-Down
3A
RFQ
MIC2172YM-TR
Microchip Technology
IC REG MULTI CONFG ADJ 8SOIC
Na skladě9657 pcs
1
Positive or Negative, Isolation Capable
Boost, Cuk, Flyback, Forward Converter
1.24V
65V (Switch)
No
3V
100kHz
-
-
-
-
MIC2172
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
40V
Adjustable
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
1.25A (Switch)
RFQ
LTC3412AEFE#TRPBF
Analog Devices Inc.
IC REG BUCK ADJ 3A 16TSSOP
Na skladě5400 pcs
1
Positive
Buck
0.8V
5V
Yes
2.25V
300kHz ~ 4MHz
-
-
-
-
LTC3412
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
5.5V
Adjustable
16-TSSOP (0.173", 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Down
3A
RFQ
TPS62240DDCRG4
Texas Instruments
IC REG BUCK ADJ 300MA SOT23-5
Na skladě82130 pcs
1
Positive
Buck
0.6V
6V
Yes
2V
2.25MHz
-
-
-
-
TPS62240
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
6V
Adjustable
SOT-23-5 Thin, TSOT-23-5
SOT-23-THIN
Step-Down
300mA
RFQ
ISL6273IRZ-T
Renesas Electronics America Inc
IC REG BUCK ADJ 1.2A 10DFN
Na skladě15190 pcs
1
Positive
Buck
0.8V
5.5V
Yes
2.7V
1.5MHz
-
-
-
-
ISL6273
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
10-VFDFN Exposed Pad
10-DFN (3x3)
Step-Down
1.2A
RFQ
LTC3649EUFD#PBF
Analog Devices Inc.
IC REG BUCK ADJUSTABLE 4A 28QFN
Na skladě2852 pcs
1
Positive
Buck
0V
55V
Yes
3.1V
1MHz
-
-
-
-
LTC3649
Tube
-40°C ~ 125°C (TJ)
-
-
Surface Mount
60V
Adjustable
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Down
4A
RFQ
MP28127DQ-LF-Z
Monolithic Power Systems Inc.
IC REG BUCK ADJ 1.25A 8QFN
Na skladě30589 pcs
1
Positive
Buck
0.8V
4.95V
Yes
2.7V
1.5MHz
-
-
-
-
MP28127
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
10-VFDFN Exposed Pad
10-QFN (3x3)
Step-Down
1.25A
RFQ
LM2599S-5.0
Texas Instruments
IC REG BUCK 5V 3A TO263-7
Na skladě6906 pcs
1
Positive
Buck
5V
-
No
4.5V
150kHz
-
-
-
-
LM2599
Tube
-40°C ~ 125°C (TJ)
-
SIMPLE SWITCHER®
Surface Mount
40V
Fixed
TO-263-8, D²Pak (7 Leads + Tab), TO-263CA
DDPAK/TO-263-7
Step-Down
3A
RFQ
TPS61240DRVR
Texas Instruments
IC REG BOOST 5V 500MA 6SON
Na skladě85170 pcs
1
Positive
Boost
5V
-
Yes
2.3V
3.5MHz
-
-
-
-
TPS61240
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Fixed
6-WDFN Exposed Pad
6-WSON (2x2)
Step-Up
500mA (Switch)
RFQ
AP3435MPTR-G1
Diodes Incorporated
IC REG BUCK ADJ 3.5A SYNC 8SOIC
Na skladě9200 pcs
-
Positive
Buck
0.8V
4.95V
Yes
2.7V
1MHz
-
-
-
-
-
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
3.5A
RFQ
LTC3642IDD-3.3#TRPBF
Analog Devices Inc.
IC REG BUCK 3.3V 50MA 8DFN
Na skladě8300 pcs
1
Positive
Buck
3.3V
-
Yes
4.5V
-
-
-
-
-
LTC3642
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
45V
Fixed
8-WFDFN Exposed Pad
8-DFN (3x3)
Step-Down
50mA
RFQ
MP2128DT-LF-Z
Monolithic Power Systems Inc.
IC REG BUCK ADJ 1A SOT23-5
Na skladě41990 pcs
1
Positive
Buck
0.6V
6V
Yes
2.5V
2.8MHz
-
-
-
-
MP2128
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
6V
Adjustable
SC-74A, SOT-753
SOT-23-5
Step-Down
1A
RFQ
LTC3530EMS#PBF
Analog Devices Inc.
IC REG BCK BST ADJ 600MA 10MSOP
Na skladě7870 pcs
1
Positive
Buck-Boost
1.8V
5.25V
Yes
1.8V
300kHz ~ 2MHz
-
-
-
-
LTC3530
Tube
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-MSOP
Step-Up/Step-Down
600mA
RFQ
LT3437HFE#PBF
Analog Devices Inc.
IC REG BUCK ADJ 500MA 16TSSOP
Na skladě5593 pcs
1
Positive
Buck
1.25V
57V
No
3.5V
200kHz
-
-
-
-
LT3437
Tube
-40°C ~ 140°C (TJ)
-
-
Surface Mount
60V
Adjustable
16-TSSOP (0.173', 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Down
500mA (Switch)
RFQ
LT1376CS8-5#TRPBF
Analog Devices Inc.
IC REG BUCK SEPIC 5V 1.5A 8SOIC
Na skladě7071 pcs
1
Positive
Buck, SEPIC
5V
-
No
5V
500kHz
-
-
-
-
LT1376
Tape & Reel (TR)
0°C ~ 125°C (TJ)
-
-
Surface Mount
25V
Fixed
8-SOIC (0.154", 3.90mm Width)
8-SO
Step-Down
1.5A (Switch)
RFQ
LT8302IS8E#TRPBF
Analog Devices Inc.
IC REG FLYBACK 3.6A 8SOIC
Na skladě5693 pcs
1
Positive or Negative, Isolation Capable
Flyback
-
-
No
2.8V
Down to 12kHz
-
-
-
-
LT8302
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
42V
-
8-SOIC (0.154", 3.90mm Width) Exposed Pad
8-SOIC-EP
Step-Up/Step-Down
3.6A
RFQ
MAX17225ENT+T
Analog Devices Inc./Maxim Integrated
IC REG BOOST ADJ 1A 6WLP
Na skladě11633 pcs
1
Positive
Boost
1.8V
5V
Yes
0.4V
2.5MHz
-
-
-
-
MAX17225
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
5.5V
Adjustable
6-XFBGA, WLBGA
6-WLP (1.42x0.89)
Step-Up
1A (Switch)
RFQ
TPS62672YFDR
Texas Instruments
IC REG BUCK 1.5V 650MA 6DSBGA
Na skladě72100 pcs
1
Positive
Buck
1.5V
-
Yes
2.3V
6MHz
-
-
-
-
TPS62672
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
4.8V
Fixed
6-XFBGA, DSBGA
6-DSBGA
Step-Down
650mA
RFQ
NCV3063MNTXG
onsemi
IC REG BUCK BST ADJ 1.5A 8DFN
Na skladě75220 pcs
1
Positive or Negative
Buck, Boost
1.25V
40V (Switch)
No
3V
150kHz
-
-
-
-
NCV3063
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
-
Surface Mount
40V
Adjustable
8-VDFN Exposed Pad
8-DFN (4x4)
Step-Up, Step-Down
1.5A (Switch)
RFQ
ACT4528YH-T
Active-Semi
IC REG BUCK PROG 3A SYNC 8SOP
Na skladě36480 pcs
1
Positive
Buck
5.1V, 9.1V, 12.1V
-
Yes
4.5V
125kHz
Digi-Reel®
Lead free / RoHS Compliant
3 (168 Hours)
1488-1087-6
-
-
-40°C ~ 85°C (TA)
Buck Switching Regulator IC Positive Programmable 5.1V, 9.1V, 12.1V 1 Output 3A 8-SOIC (0.154", 3.90mm Width) Exposed Pad
-
Surface Mount
36V
Programmable
8-SOIC (0.154", 3.90mm Width) Exposed Pad
8-SOP-EP
Step-Down
3A
RFQ
LTC3630AMPMSE#PBF
Analog Devices Inc.
IC REG BCK ADJ/PROG 500MA 16MSOP
Na skladě2630 pcs
1
Positive or Negative
Buck
0.8V (1.8V, 3.3V, 5V)
76V
Yes
4V
-
-
-
-
-
LTC3630
Tube
-55°C ~ 150°C (TJ)
-
-
Surface Mount
76V
Adjustable (Programmable)
16-TFSOP (0.118', 3.00mm Width), 12 Leads, Exposed Pad
16-MSOP-EP
Step-Down
500mA
RFQ
MP2208DL-LF-P
Monolithic Power Systems Inc.
IC REG BUCK ADJUSTABLE 4A 14QFN
Na skladě12142 pcs
1
Positive
Buck
0.8V
14.4V
Yes
3V
600kHz
-
-
-
-
MP2208
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
16V
Adjustable
14-VFDFN Exposed Pad
14-QFN (3x4)
Step-Down
4A
RFQ
AP1509-SL-13
Diodes Incorporated
IC REG BUCK ADJUSTABLE 2A 8SOP
Na skladě14560 pcs
1
Positive
Buck
1.23V
18V
No
4.5V
150kHz
-
-
-
-
AP1509
Tape & Reel (TR)
-20°C ~ 85°C (TA)
-
-
Surface Mount
22V
Adjustable
8-SOIC (0.154', 3.90mm Width)
8-SOP
Step-Down
2A
RFQ
IR3475MTRPBF
Infineon Technologies
IC REG BUCK ADJUSTABLE 10A 16QFN
Na skladě6700 pcs
1
Positive
Buck
0.5V
12V
Yes
3V
Up to 750kHz
-
-
-
-
IR3475
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
SupIRBuck®
Surface Mount
27V
Adjustable
16-PowerVFQFN
16-QFN (4x5)
Step-Down
10A
RFQ
ICL7662CBD
Analog Devices Inc./Maxim Integrated
IC REG CHARGE PUMP INV 14SOIC
Na skladě5920 pcs
1
Negative
Charge Pump
-Vin
-
No
4.5V
10kHz
-
-
-
-
ICL7662
Tube
0°C ~ 70°C (TA)
-
-
Surface Mount
20V
Fixed
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Ratiometric
-
RFQ
LT1936HMS8E
Analog Devices Inc.
IC REG BUCK ADJ 1.4A 8MSOP
Na skladě7010 pcs
1
Positive
Buck
1.2V
36V
No
3.6V
500kHz
-
-
-
-
-
Tube
-40°C ~ 150°C
-
-
Surface Mount
36V
Adjustable
8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
8-MSOP-EP
Step-Down
1.4A
RFQ
LT8641HUDC#TRPBF
Analog Devices Inc.
IC REG BUCK ADJ 3.5A 20QFN
Na skladě4948 pcs
1
Positive
Buck
0.8V
64.35V
Yes
3V
210kHz ~ 2MHz
-
-
-
-
LT8641
Tape & Reel (TR)
-40°C ~ 150°C (TJ)
-
Silent Switcher®1
Surface Mount
65V
Adjustable
20-WFQFN, 18 Leads, Exposed Pad
20-QFN (3x4)
Step-Down
3.5A
RFQ
MAX634CPA
Analog Devices Inc./Maxim Integrated
IC REG BCK BST ADJ 150MA 8DIP
Na skladě10200 pcs
1
Negative
Buck-Boost
-2.6V
-20V
No
2.6V
100Hz ~ 75kHz
-
-
-
-
MAX634
Tube
0°C ~ 70°C (TA)
-
-
Through Hole
16.5V
Adjustable
8-DIP (0.300', 7.62mm)
8-PDIP
Step-Up/Step-Down
150mA
RFQ
TPS561201DDCT
Texas Instruments
IC REG BUCK ADJ 1A TSOT23-6
Na skladě47770 pcs
1
Positive
Buck
0.76V
7V
Yes
4.5V
580kHz
-
-
-
-
TPS561201
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
SWIFT™
Surface Mount
17V
Adjustable
SOT-23-6 Thin, TSOT-23-6
SOT-23-THIN
Step-Down
1A
RFQ
SP6650EU-L
MaxLinear, Inc.
IC REG BUCK ADJ/3.3V 0.6A 10MSOP
Na skladě14940 pcs
1
Positive
Buck
1.25V (3.3V)
6.5V
Yes
2.7V
-
-
-
-
-
-
Tube
-40°C ~ 85°C (TA)
-
-
Surface Mount
6.5V
Adjustable (Fixed)
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-MSOP
Step-Down
600mA
RFQ
FAN48617UC50X
onsemi
IC REG BOOST 5V 1A 9WLCSP
Na skladě101800 pcs
1
Positive
Boost
5V
-
Yes
2.7V
-
-
-
-
-
FAN48617
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
TinyBoost®
Surface Mount
4.5V
Fixed
9-UFBGA, WLCSP
9-WLCSP (1.22x1.22)
Step-Up
1A
RFQ
LT3976IMSE#PBF
Analog Devices Inc.
IC REG BUCK ADJUSTABLE 5A 16MSOP
Na skladě3921 pcs
1
Positive
Buck
1.197V
38.8V
No
4.3V
200kHz ~ 2.25MHz
-
-
-
-
LT3976
Tube
-40°C ~ 125°C (TJ)
-
-
Surface Mount
40V
Adjustable
16-TFSOP (0.118', 3.00mm Width) Exposed Pad
16-MSOP-EP
Step-Down
5A
RFQ
LTC3602IUF#TRPBF
Analog Devices Inc.
IC REG BUCK ADJ 2.5A 20QFN
Na skladě5172 pcs
1
Positive
Buck
0.6V
9.5V
Yes
4.5V
1MHz
-
-
-
-
LTC3602
Tape & Reel (TR)
-40°C ~ 85°C (TA)
-
-
Surface Mount
10V
Adjustable
20-WFQFN Exposed Pad
20-QFN (4x4)
Step-Down
2.5A
RFQ
IR3810MTR1PBF
Infineon Technologies
IC REG BUCK ADJUSTABLE 12A PQFN
Na skladě10320 pcs
1
Positive
Buck
0.6V
12V
Yes
2.5V
600kHz
-
-
-
-
IR3810
Tape & Reel (TR)
-40°C ~ 125°C (TJ)
-
SupIRBuck®
Surface Mount
21V
Adjustable
15-PowerVQFN
PQFN (5x6)
Step-Down
12A
RFQ