SC4250LISTRT
Semtech Corporation
IC HOT SWAP CTRLR -48V 8SO
En stock15630 pcs
8-SO
Tape & Reel (TR)
SC4250
-
OVP, Slew, UVLO
No
10V ~ 80V
8-SOIC (0.154', 3.90mm Width)
-48V
1
Auto Retry, Fault Timeout
Hot Swap Controller
Surface Mount
-40°C ~ 125°C
3 mA
-
RFQ
TPS2342PFP
Texas Instruments
IC HOT PLUG CTRLR PCI 80HTQFP
En stock9580 pcs
80-HTQFP (12x12)
Tray
TPS2341
100mA, 375mA, 500mA
Current Limit, Slew Rate
Both
1.5V, 3.3V, 5V, ±12V
80-TQFP Exposed Pad
PCI, PCI-X
12
Latched Fault, Thermal Limit, UVLO
Hot Plug Controller
Surface Mount
-40°C ~ 85°C
-
-
RFQ
ADM1176-2ARMZ-R7
Analog Devices Inc.
IC HOT SWAP CTRLR GP 10MSOP
En stock6958 pcs
10-MSOP
Tape & Reel (TR)
ADM1176
-
Current Limit, Fault Timeout, Turn On Voltage
No
3.15V ~ 16.5V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
General Purpose
1
I²C, Latched Fault, UVLO
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
1.7 mA
-
RFQ
LT4254IGN#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 16SSOP
En stock11218 pcs
16-SSOP
Tape & Reel (TR)
LT4254
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, Slew Rate, UVLO
No
10.8V ~ 36V
16-SSOP (0.154', 3.90mm Width)
General Purpose
1
-
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.9 mA
-
RFQ
LT1640LIS8#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR -48V 8SOIC
En stock8317 pcs
8-SO
Tape & Reel (TR)
LT1640
-
Circuit Breaker, Fault Timeout, OVP, UVLO
No
-80V ~ -10V
8-SOIC (0.154', 3.90mm Width)
-48V
1
Auto Retry
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.3 mA
-
RFQ
LTC4232IDHC#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 16DFN
En stock2464 pcs
16-DFN (5x3)
Tape & Reel (TR)
LTC4232
5A
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, UVLO
Yes
2.9V ~ 15V
16-WFDFN Exposed Pad
General Purpose
1
Thermal Limit
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
1.6 mA
-
RFQ
MAX5924AEUB+T
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR GP 10UMAX
En stock9183 pcs
10-uMAX/uSOP
Tape & Reel (TR)
MAX5924
-
Circuit Breaker, Slew Rate, Turn On Voltage
No
1V ~ 13.2V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
General Purpose
1
Fault Timeout, Latched Fault, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.5 mA
-
RFQ
LTC4224CDDB-1#TRMPBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 10DFN
En stock8134 pcs
10-DFN (3x2)
Tape & Reel (TR)
LTC4224
-
Current Limit, Slew Rate
No
1V ~ 6V
10-WFDFN Exposed Pad
General Purpose
2
Fault Timeout, Latched Fault, UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1.4 mA
-
RFQ
LT4256-1CS8#PBF
Linear Technology
POSITIVE HIGH VOLTAGE HOT SWAP C
En stock11980 pcs
8-SO
Bulk
LT4256
-
Current Limit, Fault Timeout, Slew Rate, UVLO
No
10.8V ~ 80V
8-SOIC (0.154", 3.90mm Width)
General Purpose
1
Latched Fault
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1.8 mA
-
RFQ
LTC4234CWHH#PBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 38QFN
En stock4031 pcs
38-QFN (5x9)
Tube
LTC4234
20A
Current Limit, Fault Timeout, OVP, Turn On Voltage
Yes
2.9V ~ 15V
38-VFQFN Exposed Pad
General Purpose
1
Auto Retry
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1.6 mA
-
RFQ
LTC1643AHCGN#TRPBF
Analog Devices Inc.
IC HOT SWAP CTR MOTHERBRD 16SSOP
En stock5950 pcs
16-SSOP
Tape & Reel (TR)
LTC1643
200mA, 500mA
Current Limit, Fault Timeout, Slew Rate
Both
3.3V, 5V, ±12V
16-SSOP (0.154", 3.90mm Width)
Motherboard
4
Latched Fault, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
-
-
RFQ
MAX34565ETB+
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR PCI EXP 10TDFN
En stock24719 pcs
10-TDFN (3x3)
Tube
MAX34565
3.6A
Current Limit, Slew Rate
Yes
9V ~ 13.2V
10-WFDFN Exposed Pad
PCI Express®
1
Latched Fault, OVP, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 150°C
1.6 mA
-
RFQ
LT4250HCS8#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR -48V 8SOIC
En stock10057 pcs
8-SO
Tape & Reel (TR)
LT4250
-
Current Limit, Latched Fault, OVP, UVLO
No
-80V ~ 18V
8-SOIC (0.154', 3.90mm Width)
-48V
1
Fault Timeout
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1.6 mA
-
RFQ
LTC1643ALCGN#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR PCI 16SSOP
En stock4152 pcs
16-SSOP
Tape & Reel (TR)
LTC1643
200mA, 500mA
Current Limit, Fault Timeout, Slew Rate
Both
3.3V, 5V, ±12V
16-SSOP (0.154', 3.90mm Width)
CompactPCI™
4
Latched Fault, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
-
-
RFQ
ISL61851DCBZ-T
Renesas Electronics America Inc
IC HOT SWAP CTRLR USB 8SOIC
En stock10030 pcs
8-SOIC
Tape & Reel (TR)
ISL61851
1.1A
-
Yes
2.3V ~ 5.5V
8-SOIC (0.154', 3.90mm Width)
USB
2
Auto Retry, Fault Timeout, Thermal Limit, Turn On Voltage, UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
50 µA
-
RFQ
MAX5903LBEUT
Analog Devices Inc./Maxim Integrated
HOT-SWAP CONTROLLER
En stock12061 pcs
SOT-23-6
Bulk
MAX5903
-
Circuit Breaker, Current Limit, Latched Fault, Thermal Limit, UVLO
Both
9V ~ 72V
SOT-23-6
Networking
1
Latched Fault, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 85°C (TA)
1 mA
Simple Swapper™
RFQ
MAX5921BESA+
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR -48V 8SOIC
En stock6492 pcs
8-SOIC
Tube
MAX5921
-
Circuit Breaker, Current Limit, OVP, UVLO
No
-80V ~ -20V
8-SOIC (0.154', 3.90mm Width)
-48V
1
Auto Retry, Fault Timeout, Thermal Limit
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
700 µA
-
RFQ
ISL6116CB
Renesas Electronics America Inc
IC HOT SWAP CTRLR GP 8SOIC
En stock10860 pcs
8-SOIC
Tube
ISL6116
-
Current Limit, Fault Timeout
No
9V ~ 15V
8-SOIC (0.154', 3.90mm Width)
General Purpose
1
Latched Fault
Hot Swap Controller
Surface Mount
0°C ~ 85°C
3 mA
-
RFQ
TPS2493PWR
Texas Instruments
IC HOT SWAP CTRLR GP 14TSSOP
En stock16638 pcs
14-TSSOP
Tape & Reel (TR)
TPS2493
-
Current Limit, Fault Timeout, OVP, UVLO
No
9V ~ 80V
14-TSSOP (0.173", 4.40mm Width)
General Purpose
1
Auto Retry
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 125°C
1 mA
-
RFQ
ADM1275-3ARQZ-R7
Analog Devices Inc.
IC HOT SWAP CTRLR GP 20QSOP
En stock2774 pcs
20-QSOP
Tape & Reel (TR)
ADM1275
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, UVLO
No
2.95V ~ 20V
20-SSOP (0.154', 3.90mm Width)
General Purpose
1
PMBus
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
5 mA
-
RFQ
ISL6141CB
Intersil
POWER SUPPLY CIRCUIT, ADJ
En stock25389 pcs
8-SOIC
Tube
ISL6141
-
Current Limit, OVP, UVLO
No
20V ~ 80V
8-SOIC (0.154", 3.90mm Width)
-48V, VoIP
1
Auto Retry, Fault Timeout
Hot Swap Controller
Surface Mount
0°C ~ 70°C
2.4 mA
IntelliTrip™
RFQ
LTC1642AIGN#PBF
Analog Devices Inc.
IC HOTSWAP CTR INFINIBAND 16SSOP
En stock4284 pcs
16-SSOP
Tube
LTC1642
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault, UVLO
No
2.97V ~ 16.5V
16-SSOP (0.154", 3.90mm Width)
InfiniBand™
1
-
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.25 mA
-
RFQ
LTC4261IGN#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR -48V 28SSOP
En stock2184 pcs
28-SSOP
Tape & Reel (TR)
LTC4261
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, UVLO
No
-48V
28-SSOP (0.154", 3.90mm Width)
-48V
1
I²C
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
2 mA
-
RFQ
LTC1644CGN#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR PCI 20SSOP
En stock5199 pcs
20-SSOP
Tape & Reel (TR)
LTC1644
100mA, 500mA
Current Limit, Fault Timeout
Both
3.3V, 5V, ±12V
20-SSOP (0.154', 3.90mm Width)
CompactPCI™
4
Latched Fault, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
-
-
RFQ
UCC2913DTR
Texas Instruments
IC HOT SWAP CTRLR -48V 8SOIC
En stock16130 pcs
8-SOIC
Tape & Reel (TR)
UCC2913
-
Circuit Breaker, Current Limit, Fault Timeout
No
-
8-SOIC (0.154', 3.90mm Width)
-48V
1
Auto Retry, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1 mA
-
RFQ
MAX5947BESA+T
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR GP 8SOIC
En stock10349 pcs
8-SOIC
Tape & Reel (TR)
MAX5947
-
Current Limit, Fault Timeout, OVP, UVLO
No
9V ~ 80V
8-SOIC (0.154', 3.90mm Width)
General Purpose
1
Auto Retry, Thermal Limit
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.4 mA
-
RFQ
MAX5903AAETT+T
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR GP 6TDFN
En stock8214 pcs
6-TDFN (3x3)
Tape & Reel (TR)
MAX5903
-
UVLO
No
9V ~ 72V
6-WDFN Exposed Pad
General Purpose
1
Auto Retry, Fault Timeout, Thermal Limit
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1 mA
Simple Swapper™
RFQ
MAX5904ESA+T
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR PCI EXP 8SOIC
En stock6491 pcs
8-SOIC
Tape & Reel (TR)
MAX5904
-
Circuit Breaker, Current Limit, Fault Timeout
No
1V ~ 13.2V
8-SOIC (0.154", 3.90mm Width)
PCI Express®
2
Auto Retry, UVLO
Hot Swap Controller, Sequencer
Surface Mount
-40°C ~ 85°C
1.2 mA
VariableSpeed/BiLevel™
RFQ
MIC2589-1YM
Microchip Technology
IC HOT SWAP CTRLR -48V 14SOIC
En stock4280 pcs
14-SOIC
Tube
MIC2589
-
Current Limit, Fault Timeout, OVP, UVLO
No
-80V ~ -19V
14-SOIC (0.154', 3.90mm Width)
-48V
1
Latched Fault
Hot Swap Controller, Sequencer
Surface Mount
-40°C ~ 85°C
4 mA
-
RFQ
LTC4211CMS#PBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 10MSOP
En stock8683 pcs
10-MSOP
Tube
LTC4211
-
Auto Retry, Circuit Breaker, Current Limit, Fault Timeout, Latched Fault, OVP
No
2.5V ~ 16.5V
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
General Purpose
1
UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1 mA
-
RFQ
MAX5900AAEUT
Analog Devices Inc./Maxim Integrated
HOT-SWAP CONTROLLER
En stock13066 pcs
SOT-23-6
Bulk
MAX5900
-
Auto Retry, Circuit Breaker, Current Limit, Fault Timeout, Latched Fault, Slew Rate, UVLO
No
-9V ~ -100V
SOT-23-6
Networking
1
Auto Retry, Fault Timeout, Latched Fault, Thermal Limit, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 85°C (TA)
500 µA
Simple Swapper™
RFQ
LTC4252CIMS-1#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR -48V 10MSOP
En stock6139 pcs
10-MSOP
Tape & Reel (TR)
LTC4252
-
Current Limit, Fault Timeout, OVP, UVLO
No
-48V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
-48V
1
Latched Fault
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
900 µA
-
RFQ
UCC3916DPTR
Texas Instruments
IC HOT SWAP CTRLR SCSI 8SOIC
En stock12809 pcs
8-SOIC
Tape & Reel (TR)
UCC3916
1.65A
Fault Timeout
Yes
4V ~ 6V
8-SOIC (0.154', 3.90mm Width)
SCSI
1
Thermal Limit
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1 mA
-
RFQ
ISL61863IIRZ
Renesas Electronics America Inc
IC HOT SWAP CTRLR USB 10DFN
En stock16370 pcs
10-DFN (3x3)
Tube
ISL61863
3.6A
-
Yes
2.5V ~ 5.5V
10-VFDFN Exposed Pad
USB
2
Fault Timeout, Latched Fault, Thermal Limit, Turn On Voltage, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
57 µA
-
RFQ
ADM1275-1ACPZ
Analog Devices Inc.
IC HOT SWAP CTRLR GP 20LFCSP
En stock3605 pcs
20-LFCSP-WQ (5x5)
Tray
ADM1275
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, UVLO
No
2.95V ~ 20V
20-WQFN Exposed Pad, CSP
General Purpose
1
PMBus
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
5 mA
-
RFQ
UCC3921D
Texas Instruments
IC HOT SWAP CTRLR GP 8SOIC
En stock9915 pcs
8-SOIC
Tube
UCC3921
-
Auto Retry, Circuit Breaker, Current Limit, Fault Timeout, Latched Fault
No
-48V
8-SOIC (0.154', 3.90mm Width)
General Purpose
1
UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
1 mA
-
RFQ
TPS25972LRPWR
Texas Instruments
2.7-V TO 23-V, 10-MOHM, 7-A EFUS
En stock47900 pcs
10-VQFN-HR (2x2)
Tape & Reel (TR)
TPS25972
-
-
-
-
10-VFQFN
-
-
-
-
Surface Mount
-
-
-
RFQ
ADM1075-1ACPZ-RL7
Analog Devices Inc.
IC HOT SWAP CTRLR -48V 28LFCSP
En stock3448 pcs
28-LFCSP-WQ (5x5)
Tape & Reel (TR)
ADM1075
-
Circuit Breaker, Current Limit, Fault Timeout, OVP, UVLO
No
-80V ~ -35V
28-WFQFN Exposed Pad, CSP
-48V
1
Auto Retry, PMBus
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
5.5 mA
-
RFQ
TPS24740RGER
Texas Instruments
IC HOT SWAP CTRLR GP 24VQFN
En stock6982 pcs
24-VQFN (4x4)
Tape & Reel (TR)
TPS24740
-
Current Limit, Fault Timeout, OVP, Turn On Voltage
No
2.5V ~ 18V
24-VFQFN Exposed Pad
General Purpose
1
Latched Fault, UVLO
Hot Swap Controller, OR Controller
Surface Mount
-40°C ~ 125°C
4.2 mA
-
RFQ
MAX5912ESE+
Analog Devices Inc./Maxim Integrated
IC HOT SWAP CTRLR -48V 16SOIC
En stock5760 pcs
16-SOIC
Tube
MAX5912
415mA
UVLO
Yes
-65V ~ -16V
16-SOIC (0.154", 3.90mm Width)
-48V
1
Thermal Limit
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.5 mA
Simple Swapper™
RFQ
LM5069MM-1
Texas Instruments
POWER SUPPLY SUPPORT CIRCUIT, AD
En stock19113 pcs
10-VSSOP
Bulk
-
-
Circuit Breaker, Current Limit, Fault Timeout, OVP, UVLO
No
9V ~ 80V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
General Purpose
1
Fault Timeout, Latched Fault, OVP, UVLO
Hot Swap Controller
Surface Mount
-40°C ~ 125°C (TJ)
1.3 mA
-
RFQ
LT4220CGN#PBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 16SSOP
En stock7207 pcs
16-SSOP
Tube
LT4220
-
Auto Retry, Fault Timeout, Latched Fault, UVLO
No
2.7V ~ 16.5V
16-SSOP (0.154', 3.90mm Width)
General Purpose
2
-
Hot Swap Controller
Surface Mount
0°C ~ 70°C
2.7 mA
-
RFQ
UCC3917D
Texas Instruments
IC HOT SWAP CTRLR GP 16SOIC
En stock13890 pcs
16-SOIC
Tube
UCC3917
-
Auto Retry, Circuit Breaker, Current Limit, Fault Timeout, Latched Fault
No
15V ~ 1000V
16-SOIC (0.154', 3.90mm Width)
General Purpose
1
UVLO
Hot Swap Controller
Surface Mount
0°C ~ 70°C
5 mA
-
RFQ
LTC4215CUFD-1#TRPBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 24QFN
En stock6076 pcs
24-QFN (4x5)
Tape & Reel (TR)
LTC4215
-
Auto Retry, Current Limit, Fault Timeout, Latched Fault
No
2.9V ~ 15V
24-WFQFN Exposed Pad
General Purpose
1
I²C, OVP, UVLO
Hot Swap Controller, Monitor
Surface Mount
0°C ~ 70°C
3 mA
-
RFQ
LTC1645CS#PBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 14SOIC
En stock5414 pcs
14-SO
Tube
LTC1645
-
Auto Retry, Circuit Breaker, Fault Timeout, Latched Fault, Slew Rate
No
1.2V ~ 12V
14-SOIC (0.154", 3.90mm Width)
General Purpose
2
UVLO
Hot Swap Controller, Sequencer
Surface Mount
0°C ~ 70°C
1.1 mA
-
RFQ
MIC2085-JYQS
Microchip Technology
IC HOTSWAP CTR INFINIBAND 16QSOP
En stock8225 pcs
16-QSOP
Tube
MIC2085
-
Current Limit, Fault Timeout, Slew Rate
No
2.3V ~ 16.5V
16-SSOP (0.154", 3.90mm Width)
InfiniBand™
1
Auto Retry, OVP
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1.6 mA
-
RFQ
LTC4217IFE#PBF
Analog Devices Inc.
IC HOT SWAP CTRLR GP 20TSSOP
En stock6640 pcs
20-TSSOP-EP
Tube
LTC4217
2A
Auto Retry, Current Limit, Fault Timeout, Latched Fault, OVP, UVLO
Yes
2.9V ~ 26.5V
20-TSSOP (0.173', 4.40mm Width) Exposed Pad
General Purpose
1
Thermal Limit
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
1.6 mA
-
RFQ
TPS24711DGSR
Texas Instruments
IC HOT SWAP CTRLR GP 10VSSOP
En stock29080 pcs
10-VSSOP
Tape & Reel (TR)
TPS24711
-
Current Limit, Fault Timeout, UVLO
No
2.5V ~ 18V
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
General Purpose
1
Auto Retry, Thermal Limit
Hot Swap Controller
Surface Mount
-40°C ~ 85°C
1 mA
-
RFQ
ADM1178-2ARMZ-R7
Analog Devices Inc.
IC HOT SWAP CTRLR GP 10MSOP
En stock8288 pcs
10-MSOP
Tape & Reel (TR)
ADM1178
-
Current Limit, Fault Timeout, Turn On Voltage
No
3.15V ~ 16.5V
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
General Purpose
1
I²C, Latched Fault, UVLO
Hot Swap Controller, Monitor
Surface Mount
-40°C ~ 85°C
1.7 mA
-
RFQ
ISL6151CBZA
Renesas Electronics America Inc
IC HOT SWAP CTRLR -48V 8SOIC
En stock13990 pcs
8-SOIC
Tube
ISL6151
-
Current Limit, OVP, UVLO
No
20V ~ 80V
8-SOIC (0.154', 3.90mm Width)
-48V, VoIP
1
Auto Retry, Fault Timeout
Hot Swap Controller
Surface Mount
0°C ~ 70°C
2.4 mA
IntelliTrip™
RFQ