QD48T033050-NCB0
Bel Power Solutions
DC DC CONVERTER 3.3V 5V 100W
Na skladě4000 pcs
88%
2
Enable, Active Low
15A, 10A
36V
3.3V
5V
-
-
2 kV
-
QD48T033050
Bulk
Through Hole
QD48
-40°C ~ 85°C
2.30' L x 1.45' W x 0.50' H (58.4mm x 36.8mm x 12.7mm)
75V
Isolated Module
Remote On/Off, OCP, OTP, OVP, UVLO
ITE (Commercial)
7-DIP Module, 1/4 Brick
-
100 W
RFQ
QW24T25033-NGB0G
Bel Power Solutions
DC DC CONVERTER 3.3V 83W
Na skladě5430 pcs
92.5%
1
Enable, Active Low
25A
18V
3.3V
-
-
-
2 kV
-
QW24T25033
Bulk
Through Hole
QW
-40°C ~ 85°C
2.30' L x 1.45' W x 0.48' H (58.4mm x 36.8mm x 12.2mm)
60V
Isolated Module
Remote On/Off, OCP, OTP, OVP, UVLO
ITE (Commercial)
8-DIP Module
-
83 W
RFQ
VI-BNJ-CU
Vicor Corporation
DC DC CONVERTER 36V 200W
Na skladě86 pcs
90%
1
-
5.56A
36V
36V
-
-
-
3 kV
-
VI-BNJ
Bulk
Through Hole
VI-200™ (200W)
-25°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
76V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
200 W
RFQ
PTH03010WAZT
Artesyn Embedded Power
DC DC CONVERTER 0.8-2.5V 38W
Na skladě2653 pcs
93%
1
-
15A
2.95V
0.8 ~ 2.5V
-
-
-
-
-
PTH03010
Tape & Reel (TR)
Surface Mount
PTH03010 (37W)
-40°C ~ 85°C
1.37' L x 0.62' W x 0.35' H (34.8mm x 15.8mm x 9.0mm)
3.65V
Non-Isolated PoL Module
Remote On/Off, SCP, UVLO
ITE (Commercial)
10-SMD Module
-
38 W
RFQ
VI-B0M-EX
Vicor Corporation
DC DC CONVERTER 10V 75W
Na skladě4170 pcs
88%
1
-
7.5A
10V
10V
-
-
-
3 kV
-
VI-B0M
Bulk
Through Hole
VI-200™ (75W)
-10°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
20V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
75 W
RFQ
PM20-12S05
TDK-Lambda Americas Inc
DC DC CONVERTER 5V 20W
Na skladě3650 pcs
-
1
-
4A
9V
5V
-
-
-
700 V
-
-
-
Through Hole
PM
-40°C ~ 60°C
2.00" L x 1.60" W x 0.33" H (50.8mm x 40.6mm x 8.5mm)
18V
Isolated Module
Remote On/Off, OVP, SCP
ITE (Commercial)
8-DIP Module, 7 Leads
-
20 W
RFQ
VE-J54-IW
Vicor Corporation
DC DC CONVERTER 48V 100W
Na skladě3690 pcs
90%
1
-
2.08A
100V
48V
-
-
-
3 kV
-
VE-J54
Bulk
Through Hole
VE-J00™ (100W)
-40°C ~ 100°C
2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm)
200V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
100 W
RFQ
VE-252-MY
Vicor Corporation
DC DC CONVERTER 15V 50W
Na skladě3890 pcs
90%
1
-
3.33A
100V
15V
-
-
-
3 kV
-
VE-252
Bulk
Through Hole
VE-200™ (50W)
-55°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
200V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
50 W
RFQ
EXB250-48S05J
Artesyn Embedded Power
DC DC CONVERTER 5V 165W
Na skladě4150 pcs
91.7%
1
-
33A
33V
5V
-
-
-
1.5 kV
-
-
Tray
Through Hole
EXB250 (165W)
-40°C ~ 100°C
2.40' L x 2.28' W x 0.50' H (61.0mm x 57.9mm x 12.7mm)
75V
Isolated Module
Remote On/Off, OCP, OVP, SCP, UVLO
ITE (Commercial)
Half Brick
-
165 W
RFQ
VI-2W2-01
Vicor Corporation
VI-2W2-01 24V/15V 150W
Na skladě36 pcs
-
-
-
-
-
-
-
-
-
-
-
VI-2W2
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
VE-271-MX
Vicor Corporation
DC DC CONVERTER 12V 75W
Na skladě3870 pcs
90%
1
-
6.25A
100V
12V
-
-
-
3 kV
-
VE-271
Bulk
Through Hole
VE-200™ (75W)
-55°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
375V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
75 W
RFQ
SXE15-48S3V3
Artesyn Embedded Power
DC DC CONVERTER 3.3V 15W
Na skladě3640 pcs
86%
1
-
4.5A
33V
3.3V
-
-
-
1.5 kV
-
-
-
Surface Mount
SXE15 (15W)
-40°C ~ 65°C
1.91" L x 1.15" W x 0.34" H (48.5mm x 29.2mm x 8.6mm)
75V
Isolated Module
Remote On/Off, OCP, OVP, SCP, UVLO
ITE (Commercial)
12-SMD Module
-
15 W
RFQ
VE-J63-CW
Vicor Corporation
DC DC CONVERTER 24V 100W
Na skladě138 pcs
90%
1
-
4.17A
200V
24V
-
-
-
3 kV
-
VE-J63
Bulk
Through Hole
VE-J00™ (100W)
-25°C ~ 100°C
2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm)
400V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
100 W
RFQ
VI-250-28
Vicor Corporation
VI-250-28 150V/5V 150W
Na skladě4540 pcs
-
-
-
-
-
-
-
-
-
-
-
VI-250
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
MI-J60-IY
Vicor Corporation
DC DC CONVERTER 5V 50W
Na skladě66 pcs
90%
1
-
10A
125V
5V
-
-
-
3 kV
-
MI-J60
Bulk
Through Hole
MI-J00™ (50W)
-40°C ~ 85°C
2.40' L x 2.28' W x 0.50' H (61.0mm x 57.9mm x 12.7mm)
400V
Isolated Module
Remote On/Off, OCP, OTP, OVP
ITE (Commercial)
9-DIP Module
-
50 W
RFQ
ISL8273MAIRZ
Renesas Electronics America Inc
DC DC CONVERTER 0.6-2.5V
Na skladě3960 pcs
-
1
-
80A
4.5V
0.6 ~ 2.5V
-
-
-
-
-
ISL8273
Tray
Surface Mount
ISL8273M
-40°C ~ 85°C
0.91' L x 0.71' W x 0.30' H (23.0mm x 18.0mm x 7.5mm)
14V
Non-Isolated PoL Module, Digital
OCP, OTP, SCP, UVLO
ITE (Commercial)
58-HDA Module
-
-
RFQ
VI-J20-11
Vicor Corporation
VI-J20-11 36V/5V 65W
Na skladě69 pcs
-
-
-
-
-
-
-
-
-
-
-
VI-J20
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
VE-251-01
Vicor Corporation
VE-251-01 150V/12V 150W
Na skladě4680 pcs
-
-
-
-
-
-
-
-
-
-
-
VE-251
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
VE-811898B
Vicor Corporation
C 180/375/300 3.8V/ 40A
Na skladě106 pcs
-
-
-
-
-
-
-
-
-
-
-
-
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
MI-J2Z-IZ
Vicor Corporation
DC DC CONVERTER 2V 10W
Na skladě57 pcs
90%
1
-
5A
18V
2V
-
-
-
3 kV
-
MI-J2Z
Bulk
Through Hole
MI-J00™ (25W)
-40°C ~ 85°C
2.40" L x 2.28" W x 0.50" H (61.0mm x 57.9mm x 12.7mm)
50V
Isolated Module
Remote On/Off, OCP, OTP, OVP
ITE (Commercial)
9-DIP Module
-
10 W
RFQ
VI-B21-CW
Vicor Corporation
DC DC CONVERTER 12V 100W
Na skladě3980 pcs
90%
1
-
8.33A
21V
12V
-
-
-
3 kV
-
VI-B21
Bulk
Through Hole
VI-200™ (100W)
-25°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
56V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
100 W
RFQ
VI-B6B-CV
Vicor Corporation
DC DC CONVERTER 95V 150W
Na skladě5000 pcs
90%
1
-
1.58A
200V
95V
-
-
-
3 kV
-
VI-B6B
Bulk
Through Hole
VI-200™ (150W)
-25°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
150 W
RFQ
VE-262-IX
Vicor Corporation
DC DC CONVERTER 15V 75W
Na skladě3980 pcs
90%
1
-
5A
200V
15V
-
-
-
3 kV
-
VE-262
Bulk
Through Hole
VE-200™ (75W)
-40°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
75 W
RFQ
VI-B64-IV
Vicor Corporation
DC DC CONVERTER 48V 150W
Na skladě4380 pcs
90%
1
-
3.13A
200V
48V
-
-
-
3 kV
-
VI-B64
Bulk
Through Hole
VI-200™ (150W)
-40°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
150 W
RFQ
NXI110-12P1V8C
Artesyn Embedded Power
DC DC CONVERTER 1.8V 110W
Na skladě3630 pcs
84%
1
-
60A
11V
1.8V
-
-
-
-
-
-
-
Card Edge
NXI110 (110W)
0°C ~ 60°C
3.80' L x 2.62' W x 0.56' H (96.5mm x 66.5mm x 14.2mm)
13.2V
Non-Isolated PoL Module
Remote On/Off, OCP, OVP, SCP, UVLO
ITE (Commercial)
Module
-
110 W
RFQ
BXB100-24S12FLT
Artesyn Embedded Power
DC DC CONVERTER 12V 100W
Na skladě5460 pcs
85%
1
-
8.33A
18V
12V
-
-
-
1.5 kV
-
-
Bulk
Through Hole
BXB100 (100W)
-40°C ~ 100°C
2.40" L x 2.28" W x 0.50" H (61.0mm x 57.9mm x 12.7mm)
36V
Isolated Module
Remote On/Off, OTP, OVP, SCP, UVLO
ITE (Commercial)
9-DIP Module, 1/2 Brick
-
100 W
RFQ
VI-B64-IW
Vicor Corporation
DC DC CONVERTER 48V 100W
Na skladě4350 pcs
90%
1
-
2.08A
200V
48V
-
-
-
3 kV
-
VI-B64
Bulk
Through Hole
VI-200™ (100W)
-40°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
100 W
RFQ
VI-B64-IU
Vicor Corporation
DC DC CONVERTER 48V 200W
Na skladě50 pcs
90%
1
-
4.17A
200V
48V
-
-
-
3 kV
-
VI-B64
Bulk
Through Hole
VI-200™ (200W)
-40°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
200 W
RFQ
LES40A48-1V5RE
Artesyn Embedded Power
DC DC CONVERTER 1.5V 60W
Na skladě4770 pcs
88.5%
1
Enable, Active Low
40A
36V
1.5V
-
-
-
2.25 kV
-
-
Tray
Through Hole
Eighth-Brick
-40°C ~ 85°C
2.30' L x 0.90' W x 0.19' H (58.4mm x 22.9mm x 4.8mm)
75V
Isolated Module
Remote On/Off, OCP, OTP, OVP, SCP, UVLO
ITE (Commercial)
8-DIP Module, 1/8 Brick
-
60 W
RFQ
JFC100C1
ABB Power Electronics Inc.
DC DC CONVERTER 15V 100W
Na skladě3940 pcs
85%
1
Enable, Active Low
6.7A
18V
15V
-
-
-
1.5 kV
-
-
Bulk
Through Hole
JFC100C (100W)
-40°C ~ 100°C
2.40" L x 2.28" W x 0.50" H (61.0mm x 57.9mm x 12.7mm)
36V
Isolated Module
Remote On/Off, OCP, OTP, OVP
ITE (Commercial)
Module
-
100 W
RFQ
VE-J01-CZ
Vicor Corporation
DC DC CONVERTER 12V 25W
Na skladě89 pcs
90%
1
-
2.08A
10V
12V
-
-
-
3 kV
-
VE-J01
Bulk
Through Hole
VE-J00™ (25W)
-25°C ~ 100°C
2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm)
20V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
25 W
RFQ
VI-BW0-CW
Vicor Corporation
DC DC CONVERTER 5V 100W
Na skladě130 pcs
90%
1
-
20A
18V
5V
-
-
-
3 kV
-
VI-BW0
Bulk
Through Hole
VI-200™ (100W)
-25°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
36V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
100 W
RFQ
VE-2N1-EW
Vicor Corporation
DC DC CONVERTER 12V 100W
Na skladě5380 pcs
88%
1
-
8.33A
36V
12V
-
-
-
3 kV
-
VE-2N1
Bulk
Through Hole
VE-200™ (100W)
-10°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
76V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
100 W
RFQ
VE-J6J-CZ
Vicor Corporation
DC DC CONVERTER 36V 25W
Na skladě3900 pcs
90%
1
-
694mA
200V
36V
-
-
-
3 kV
-
VE-J6J
Bulk
Through Hole
VE-J00™ (25W)
-25°C ~ 100°C
2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm)
400V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
25 W
RFQ
EN5330DI
Intel
DC DC CONVERTER 0.8-3.3V 10W
Na skladě4410 pcs
90%
1
Enable, Active High
3A
2.375V
0.8 ~ 3.3V
-
-
-
-
-
EN5330
Tape & Reel (TR)
Surface Mount
Enpirion® 5300
-40°C ~ 85°C
0.49' L x 0.32' W x 0.08' H (12.5mm x 8.1mm x 2.1mm)
5.5V
Non-Isolated PoL Module
Remote On/Off, OCP, OTP, OVP, UVLO
ITE (Commercial)
36-PowerDFN Module
36-DFN (12.5x8.1)
-
RFQ
LW015F4
ABB Power Electronics Inc.
DC DC CONVERTER 3.3V 15W
Na skladě4120 pcs
79%
1
Enable, Active High
3A
36V
3.3V
-
-
-
1.5 kV
-
-
Bulk
Through Hole
LW015 (15W)
-40°C ~ 105°C
2.00' L x 1.00' W x 0.40' H (50.8mm x 25.4mm x 10.2mm)
75V
Isolated Module
Remote On/Off, OCP, OVP, UVLO
ITE (Commercial)
6-DIP Module
-
15 W
RFQ
VI-B0M-CX
Vicor Corporation
DC DC CONVERTER 10V 75W
Na skladě5400 pcs
90%
1
-
7.5A
10V
10V
-
-
-
3 kV
-
VI-B0M
Bulk
Through Hole
VI-200™ (75W)
-25°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
20V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
75 W
RFQ
VI-B61-EV
Vicor Corporation
DC DC CONVERTER 12V 150W
Na skladě89 pcs
88%
1
-
12.5A
200V
12V
-
-
-
3 kV
-
VI-B61
Bulk
Through Hole
VI-200™ (150W)
-10°C ~ 85°C
4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
150 W
RFQ
VE-2T3-EY
Vicor Corporation
DC DC CONVERTER 24V 50W
Na skladě4630 pcs
88%
1
-
2.08A
66V
24V
-
-
-
3 kV
-
VE-2T3
Bulk
Through Hole
VE-200™ (50W)
-10°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
160V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
50 W
RFQ
VE-JN4-MZ
Vicor Corporation
DC DC CONVERTER 48V 25W
Na skladě5260 pcs
90%
1
-
521mA
36V
48V
-
-
-
3 kV
-
VE-JN4
Bulk
Through Hole
VE-J00™ (25W)
-55°C ~ 100°C
2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm)
76V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
25 W
RFQ
VE-JNZ-MW
Vicor Corporation
DC DC CONVERTER 2V 40W
Na skladě4420 pcs
90%
1
-
20A
36V
2V
-
-
-
3 kV
-
VE-JNZ
Bulk
Through Hole
VE-J00™ (100W)
-55°C ~ 100°C
2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm)
76V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
40 W
RFQ
VE-271-MW
Vicor Corporation
DC DC CONVERTER 12V 100W
Na skladě3740 pcs
90%
1
-
8.33A
100V
12V
-
-
-
3 kV
-
VE-271
Bulk
Through Hole
VE-200™ (100W)
-55°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
375V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
100 W
RFQ
EXQ60-48D3V3-2V5-R
Artesyn Embedded Power
DC DC CONVERTER 3.3V 2.5V 60W
Na skladě5470 pcs
90.5%
2
-
12A, 16A
33V
3.3V
2.5V
-
-
1.5 kV
-
EXQ60
-
Through Hole
EXQ60 (60W)
-40°C ~ 100°C
2.30" L x 1.50" W x 0.50" H (58.4mm x 38.1mm x 12.7mm)
75V
Isolated Module
Remote On/Off, OCP, OVP, SCP, UVLO
ITE (Commercial)
7-DIP Module, 1/4 Brick
-
60 W
RFQ
VI-B61-EU-BM
Vicor Corporation
VI-B61-EU-BM 300V/12V200W
Na skladě4650 pcs
-
-
-
-
-
-
-
-
-
-
-
VI-B61
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
48IMR15-05-2
Bel Power Solutions
DC DC CONVERTER 5V 15W
Na skladě5040 pcs
82%
1
-
3A
36V
5V
-
-
-
500 V
-
-
Tube
Through Hole
IMR (15W)
-10°C ~ 50°C
1.25' L x 0.80' W x 0.47' H (31.8mm x 20.3mm x 11.9mm)
72V
Isolated Module
OCP, SCP
ITE (Commercial)
24-DIP Module, 8 Leads
-
15 W
RFQ
MEV1D4805SC
Murata Power Solutions Inc.
DC DC CONVERTER +/-5V 1W
Na skladě6559 pcs
80%
2
-
100mA, 100mA
43.2V
5V
-5V
-
-
3 kV
-
MEV1D48
Tube
Through Hole
MEV1 (1W)
-40°C ~ 85°C
0.77' L x 0.24' W x 0.40' H (19.7mm x 6.2mm x 10.2mm)
52.8V
Isolated Module
-
ITE (Commercial)
7-SIP Module, 5 Leads
-
1 W
RFQ
PC1R5-5-12
TDK-Lambda Americas Inc
DC DC CONVERTER 12V 1.5W
Na skladě4940 pcs
-
1
-
125mA
4.5V
12V
-
-
-
-
-
-
-
Through Hole
PC
-20°C ~ 70°C (With Derating)
1.08" L x 0.61" W x 0.31" H (27.5mm x 15.5mm x 7.8mm)
9V
Isolated Module
OCP
ITE (Commercial)
6-DIP Module
-
1.5 W
RFQ
VE-JNY-IW
Vicor Corporation
DC DC CONVERTER 3.3V 66W
Na skladě4670 pcs
90%
1
-
20A
36V
3.3V
-
-
-
3 kV
-
VE-JNY
Bulk
Through Hole
VE-J00™ (100W)
-40°C ~ 100°C
2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm)
76V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
66 W
RFQ
VI-B6F-CV
Vicor Corporation
DC DC CONVERTER 72V 150W
Na skladě3950 pcs
90%
1
-
2.08A
200V
72V
-
-
-
3 kV
-
VI-B6F
Bulk
Through Hole
VI-200™ (150W)
-25°C ~ 85°C
4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm)
400V
Isolated Module
OCP, OTP, OVP, SCP
ITE (Commercial)
Full Brick
-
150 W
RFQ
VE-J34-CZ
Vicor Corporation
DC DC CONVERTER 48V 25W
Na skladě5100 pcs
90%
1
-
521mA
42V
48V
-
-
-
3 kV
-
VE-J34
Bulk
Through Hole
VE-J00™ (25W)
-25°C ~ 100°C
2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm)
60V
Isolated Module
OCP, SCP
ITE (Commercial)
Half Brick
-
25 W
RFQ