Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

Flip Flops

Compare Image Name Manufacturer Pricing(USD) Quantity Weight(Kg) Size(LxWxH) Datasheet Factory Lead Time Lifecycle Status Mount Packaging Published Series Pbfree Code Part Status Moisture Sensitivity Level (MSL) Number of Terminations Termination ECCN Code Max Operating Temperature Min Operating Temperature Operating Supply Voltage Number of Ports Length RoHS Status Lead Free Contact Plating Radiation Hardening Number of Pins Additional Feature Package / Case Max Supply Voltage REACH SVHC Reach Compliance Code Min Supply Voltage Frequency Height Width Thickness Mounting Type Weight Operating Temperature Technology Height Seated (Max) Packing Method Type JESD-609 Code Terminal Finish Terminal Position Terminal Form Peak Reflow Temperature (Cel) Supply Voltage Time@Peak Reflow Temperature-Max (s) Base Part Number Pin Count Output Type Surface Mount Terminal Pitch JESD-30 Code Supply Voltage-Min (Vsup) Number of Channels Subcategory Qualification Status Power Supplies Supply Voltage-Max (Vsup) Number of Elements Output Current Polarity Output Polarity Halogen Free Number of Circuits Load Capacitance Propagation Delay Turn On Delay Time Supplier Device Package Output Characteristics Propagation Delay (tpd) Quiescent Current Logic Function High Level Output Current Low Level Output Current Number of Bits per Element Input Capacitance Function Number of Bits Clock Edge Trigger Type Voltage - Supply Number of Input Lines Number of Output Lines Family Max I(ol) Power Supply Current-Max (ICC) Count Direction Translation Clock Frequency Trigger Type Prop. Delay@Nom-Sup Current - Output High, Low Schmitt Trigger Max Propagation Delay @ V, Max CL Current - Quiescent (Iq) Max Frequency@Nom-Sup
MC100EL51DTR2G MC100EL51DTR2G Rochester Electronics, LLC 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 100EL Obsolete 3 (168 Hours) ROHS3 Compliant 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) Surface Mount -40°C~85°C TA D-Type Differential 1 8-TSSOP 1 Reset -4.2V~-5.7V 2.8GHz Positive, Negative 29mA
IDT74FCT823ATSOG8 IDT74FCT823ATSOG8 Renesas Electronics America 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 74FCT Obsolete 1 (Unlimited) 24-SOIC (0.295, 7.50mm Width) Surface Mount -40°C~85°C TA D-Type 74FCT823 Tri-State, Non-Inverted 1 9 6pF Master Reset 4.5V~5.5V Positive Edge 15mA 48mA 20ns @ 5V, 300pF 1mA
74AUP2G80GD,125 74AUP2G80GD,125 Nexperia USA Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Surface Mount Tape & Reel (TR) 2010 74AUP Obsolete 1 (Unlimited) 8 3mm RoHS Compliant Gold No 8 8-XFDFN Surface Mount -40°C~125°C TA CMOS 0.5mm TAPE AND REEL D-Type e4 DUAL 260 1.2V 40 74AUP2G80 Inverted 0.5mm FF/Latches 3.6V 2 Inverting 30pF 20.7 ns 2.2 ns 500nA 0.6pF Standard 1 Positive Edge 0.8V~3.6V 1 AUP/ULP/V 309MHz Positive Edge 4mA 4mA 6.4ns @ 3.3V, 30pF 70000000Hz
SY100E452JC SY100E452JC Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2006 100E Discontinued 1 (Unlimited) Non-RoHS Compliant 28-LCC (J-Lead) Surface Mount 0°C~70°C TA D-Type 100E452 Differential 1 28-PLCC (11.48x11.48) 5 Master Reset -4.2V~-5.5V 1.4GHz Positive Edge 89mA
CY74FCT2374CTSOCT CY74FCT2374CTSOCT Rochester Electronics, LLC 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 74FCT Obsolete 3 (168 Hours) ROHS3 Compliant 20-SOIC (0.295, 7.50mm Width) Surface Mount -40°C~85°C TA D-Type Tri-State, Non-Inverted 1 20-SOIC 8 5pF Standard 4.75V~5.25V 250MHz Positive Edge 15mA 12mA 5.2ns @ 5V, 50pF 200μA
DM74ALS174SJX DM74ALS174SJX ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 74ALS Obsolete 1 (Unlimited) 70°C 0°C 5V RoHS Compliant Lead Free 16 16-SOIC (0.209, 5.30mm Width) 5.5V 4.5V 50MHz Surface Mount 0°C~70°C TA D-Type 74ALS174 Non-Inverted 1 Non-Inverting 7 17 ns 3 ns 16-SOP D-Type, Flip-Flop -400μA 8mA 6 Master Reset 6 Positive Edge 4.5V~5.5V 3 2 50MHz Positive Edge 400μA 8mA 17ns @ 5V, 50pF 19mA
SY100S351JC-TR SY100S351JC-TR Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2010 100S Discontinued 1 (Unlimited) Non-RoHS Compliant 28-LCC (J-Lead) Surface Mount 0°C~70°C TA D-Type 100S351 Differential 1 28-PLCC (11.48x11.48) 6 Master Reset -4.2V~-5.5V 700MHz Positive Edge -49mA
74LCX112SJX 74LCX112SJX ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 74LCX yes Obsolete 1 (Unlimited) 16 RoHS Compliant Lead Free No 16 16-SOIC (0.209, 5.30mm Width) Surface Mount 242mg -40°C~85°C TA CMOS JK Type DUAL GULL WING 2.5V 74LCX112 Differential 2V 3.6V Non-Inverting 2 8 ns 7 ns AND, Flip-Flop, JK-Type 1 7pF Set(Preset) and Reset Negative Edge 2V~3.6V 5 LVC/LCX/Z 150MHz Negative Edge 24mA 24mA 7.5ns @ 3.3V, 50pF 10μA
MC74AC574MG MC74AC574MG ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 2006 74AC Obsolete 3 (168 Hours) 20 5V 2 RoHS Compliant Lead Free 20 20-SOIC (0.209, 5.30mm Width) unknown 5.275mm Surface Mount -40°C~85°C TA CMOS 2.05mm D-Type e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V 40 74AC574 Tri-State, Non-Inverted 2V FF/Latches Not Qualified 6V 1 Non-Inverting 8 50pF 13.5 ns 2 ns D-Type, Flip-Flop 4.5pF Standard 8 Positive Edge 2V~6V 3 AC 95MHz Positive Edge 24mA 24mA 9.5ns @ 5V, 50pF 8μA 60000000Hz
74LVCH16374ABQ,518 74LVCH16374ABQ,518 NXP Semiconductors 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 74LVCH Obsolete 2 (1 Year) ROHS3 Compliant 60-UFQFN Dual Rows, Exposed Pad Surface Mount -40°C~125°C TA D-Type 74LVCH16374 Tri-State, Non-Inverted 2 8 5pF Standard 1.65V~3.6V 300MHz Positive Edge 24mA 24mA 5.4ns @ 3.3V, 50pF 20μA
74AHC74BQ-Q100X 74AHC74BQ-Q100X Nexperia USA Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Surface Mount Tape & Reel (TR) 2013 74AHC Active 1 (Unlimited) 14 5V 3mm ROHS3 Compliant Gold No 14 14-VFQFN Exposed Pad Surface Mount -40°C~125°C TA CMOS D-Type e4 QUAD 260 5V 30 74AHC74 Differential 0.5mm 2V 2 Non-Inverting 20 ns 2μA 1 3pF Set(Preset) and Reset Positive Edge 2V~5.5V AHC/VHC/H/U/V 115MHz Positive Edge 8mA 8mA 9.3ns @ 5V, 50pF
DM74AS874NT DM74AS874NT ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 74AS Obsolete 1 (Unlimited) 24-DIP (0.300, 7.62mm) Through Hole 0°C~70°C TA D-Type 74AS874 Tri-State, Non-Inverted 2 24-PDIP 4 Master Reset 4.5V~5.5V 80MHz Positive Edge 15mA 48mA 10.5ns @ 5V, 50pF 133mA
74LVTH273MTCX 74LVTH273MTCX ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 74LVTH Obsolete 1 (Unlimited) 3.3V RoHS Compliant Lead Free No 20 20-TSSOP (0.173, 4.40mm Width) Surface Mount -40°C~85°C TA D-Type 74LVTH273 Non-Inverted 1 Non-Inverting 8 5.5 ns 4.9 ns D-Type, Flip-Flop 3pF Master Reset Positive Edge 2.7V~3.6V 4 7 150MHz Positive Edge 32mA 64mA 4.9ns @ 3.3V, 50pF 190μA
SY100E431JC-TR SY100E431JC-TR Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2006 100E Discontinued 1 (Unlimited) 28 Non-RoHS Compliant 28-LCC (J-Lead) not_compliant Surface Mount 0°C~70°C TA ECL 4.57mm TAPE AND REEL D-Type e0 QUAD J BEND 240 30 100E431 Differential YES S-PQCC-J28 FF/Latches Not Qualified -4.5V 3 COMPLEMENTARY OPEN-EMITTER 0.8 ns 1 Set(Preset) and Reset -4.2V~-5.5V 1.4GHz Positive Edge 132mA
MC100EP51MNR4G MC100EP51MNR4G ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 4 Weeks LIFETIME (Last Updated: 1 month ago) Surface Mount Tape & Reel (TR) 2000 100EP yes Obsolete 1 (Unlimited) 8 2mm ROHS3 Compliant Lead Free Tin 8 NECL MODE: VCC = 0V WITH VEE = -3V TO -5.5V 8-VFDFN Exposed Pad 2mm Surface Mount -40°C~85°C TA ECL TAPE AND REEL D-Type Nickel/Gold/Palladium (Ni/Au/Pd) DUAL NO LEAD 260 3.3V 40 100EP51 Differential 0.5mm 3V FF/Latches Not Qualified -4.5V 5.5V 50mA Non-Inverting Halogen Free 1 450 ps 375 ps -50mA 50mA Reset 1 Positive Edge -3V~-5.5V 47mA 3GHz Positive, Negative 0.5 ns 45mA 3000000000Hz
74FCT162374TPVCG4 74FCT162374TPVCG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 74FCT yes Obsolete 1 (Unlimited) 48 2 ROHS3 Compliant 48 48-BSSOP (0.295, 7.50mm Width) 7.49mm Surface Mount -40°C~85°C TA CMOS D-Type DUAL GULL WING NOT SPECIFIED 5V NOT SPECIFIED 74FCT162374 Tri-State, Non-Inverted 0.635mm 4.5V FF/Latches Not Qualified 5V 5.5V 2 24mA Non-Inverting 1 50pF 10 ns 2 ns 3-STATE WITH SERIES RESISTOR 4.5pF Standard 8 Positive Edge 4.5V~5.5V 8 FCT Positive Edge 24mA 24mA 500μA
74ACT18823SSC 74ACT18823SSC ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 74ACT Obsolete 1 (Unlimited) 56-BSSOP (0.295, 7.50mm Width) Surface Mount -40°C~85°C TA D-Type 74ACT18823 Tri-State, Non-Inverted 2 56-SSOP 9 4.5pF Master Reset 4.5V~5.5V 100MHz Positive Edge 24mA 24mA 9ns @ 5V, 50pF 80μA
SN74HCT374ANSR SN74HCT374ANSR Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount Cut Tape (CT) 74HCT Discontinued 1 (Unlimited) ROHS3 Compliant 20 20-SOIC (0.209, 5.30mm Width) Surface Mount -40°C~85°C TA D-Type 74HCT374 Tri-State, Non-Inverted 1 25 ns 8 3pF Standard Positive Edge 4.5V~5.5V 40MHz Positive Edge 6mA 6mA 32ns @ 5.5V, 50pF 8μA
CD74HCT175E CD74HCT175E Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 3 days ago) Through Hole Tube 74HCT Active 1 (Unlimited) 16 EAR99 5V 19.3mm ROHS3 Compliant Lead Free Gold No 16 16-DIP (0.300, 7.62mm) No SVHC 5.08mm 6.35mm 3.9mm Through Hole 951.693491mg -55°C~125°C TA CMOS D-Type e4 DUAL 5V 74HCT175 Differential FF/Latch 5V 1 4mA Non-Inverting 4 50pF 53 ns 13 ns 8μA D-Type, Flip-Flop 10pF Master Reset 4 Positive Edge 4.5V~5.5V HCT 0.08mA 25MHz Positive Edge 4mA 4mA 33ns @ 4.5V, 50pF
CD74HCT109E CD74HCT109E Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks ACTIVE (Last Updated: 3 days ago) Through Hole Tube 74HCT Active 1 (Unlimited) 16 Through Hole EAR99 5V 19.3mm ROHS3 Compliant Lead Free Gold No 16 16-DIP (0.300, 7.62mm) No SVHC 5.08mm 6.35mm 3.9mm Through Hole 951.693491mg -55°C~125°C TA CMOS JK Type e4 DUAL 5V 74HCT109 Differential FF/Latches 5V 4mA Non-Inverting 2 50pF 68 ns 17 ns 4μA AND, Flip-Flop, JK-Type 1 10pF Set(Preset) and Reset Positive Edge 4.5V~5.5V HCT 0.006 A 54MHz Positive Edge 50 ns 4mA 4mA No 40ns @ 4.5V, 50pF
MC74HCT574ADTR2G MC74HCT574ADTR2G ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 4 Weeks ACTIVE (Last Updated: 3 days ago) Surface Mount Tape & Reel (TR) 2005 74HCT yes Active 1 (Unlimited) 20 5V 2 6.5mm ROHS3 Compliant Lead Free No 20 20-TSSOP (0.173, 4.40mm Width) 4.4mm Surface Mount -55°C~125°C TA CMOS TAPE AND REEL D-Type e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V 40 74HCT574 Tri-State, Non-Inverted 0.65mm 8 FF/Latches 5V 1 Non-Inverting Halogen Free 50pF 45 ns 30 ns D-Type, Flip-Flop 10pF Standard 8 Positive Edge 4.5V~5.5V 3 HCT 0.006 A 30MHz Positive Edge 6mA 6mA 30ns @ 5V, 50pF 4μA
SN74AUP1G74YFPR SN74AUP1G74YFPR Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 5 days ago) Surface Mount Tape & Reel (TR) 74AUP yes Active 1 (Unlimited) 8 EAR99 0m ROHS3 Compliant Lead Free No 8 8-XFBGA, DSBGA 500μm 0m 0m Surface Mount -40°C~85°C TA CMOS TR D-Type e1 Tin/Silver/Copper (Sn/Ag/Cu) BOTTOM BALL 260 1.2V 74AUP1G74 Differential 0.4mm FF/Latches 3.6V Non-Inverting 1 30pF 5 ns 4 ns 3-STATE 500nA AND, D-Type, Flip-Flop 1.5pF Set(Preset) and Reset 1 Positive Edge 0.8V~3.6V AUP/ULP/V 0.004 A 0.0009mA 100MHz Positive Edge 27 ns 4mA 4mA 7ns @ 3.3V, 30pF 40000000Hz
74AUP1G175GS,132 74AUP1G175GS,132 Nexperia USA Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 13 Weeks Surface Mount Tape & Reel (TR) 74AUP Active 1 (Unlimited) 6 ROHS3 Compliant 6 6-XFDFN Surface Mount -40°C~125°C TA CMOS 0.35mm D-Type e3 Tin (Sn) DUAL NO LEAD NOT SPECIFIED 1.1V NOT SPECIFIED 74AUP1G175 Non-Inverted 0.35mm 0.8V 1 TRUE 12 ns 21.1 ns 0.8pF Reset 1 Positive Edge 0.8V~3.6V AUP/ULP/V 300MHz Positive Edge 4mA 4mA 5.7ns @ 3.3V, 30pF 500nA
DM74ALS574AN DM74ALS574AN ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 74ALS Obsolete 1 (Unlimited) 20-DIP (0.300, 7.62mm) Through Hole 0°C~70°C TA D-Type 74ALS574 Tri-State, Non-Inverted 1 20-PDIP 8 Standard 4.5V~5.5V 35MHz Positive Edge 2.6mA 24mA 14ns @ 5V, 50pF 18mA
SN74AS4374BDWE4 SN74AS4374BDWE4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 74AS yes Obsolete 1 (Unlimited) 20 2 ROHS3 Compliant 20 DUAL-RANK FLIP-FLOP 20-SOIC (0.295, 7.50mm Width) 7.5mm Surface Mount 0°C~70°C TA TTL 2.65mm D-Type DUAL GULL WING NOT SPECIFIED 5V NOT SPECIFIED 74AS4374 Tri-State, Non-Inverted 4.5V FF/Latches Not Qualified 5V 5.5V 1 48mA Non-Inverting 50pF 8 ns 2 ns D-Type, Flip-Flop 8 Standard Positive Edge 4.5V~5.5V 3 AS 125MHz Positive Edge 15mA 48mA 8ns @ 5V, 50pF 150mA
SN74LV374ADWG4 SN74LV374ADWG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 6 days ago) Surface Mount Tube 74LV yes Active 1 (Unlimited) 20 2 12.8mm ROHS3 Compliant Lead Free No 20 20-SOIC (0.295, 7.50mm Width) 2.65mm 7.5mm 2.35mm Surface Mount 500.709277mg -40°C~85°C TA CMOS D-Type e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 2.5V 74LV374 Tri-State, Non-Inverted 2V FF/Latches 3.3V 5.5V 1 16mA Non-Inverting 50pF 19.3 ns 4.9 ns 3-STATE D-Type, Flip-Flop 2.9pF Standard 8 Positive Edge 2V~5.5V 8 LV/LV-A/LVX/H 0.02mA UNIDIRECTIONAL N/A 170MHz Positive Edge 16mA 16mA 10.1ns @ 5V, 50pF 20μA 50000000Hz
SN74LV273APWR SN74LV273APWR Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 1 day ago) Surface Mount Tape & Reel (TR) 74LV yes Active 1 (Unlimited) 20 EAR99 6.5mm ROHS3 Compliant Lead Free Gold No 20 20-TSSOP (0.173, 4.40mm Width) No SVHC 1.2mm 4.4mm 1mm Surface Mount 76.997305mg -40°C~125°C TA CMOS TR D-Type e3 Matte Tin (Sn) DUAL GULL WING 260 2.5V 74LV273 Non-Inverted 0.65mm 2V FF/Latches 3.3V 5.5V 1 25mA Non-Inverting 8 50pF 22.1 ns 4.8 ns D-Type, Flip-Flop 2pF Master Reset 8 Positive Edge 2V~5.5V 2 LV/LV-A/LVX/H 160MHz Positive Edge 12mA 12mA 10.5ns @ 5V, 50pF 20μA 45000000Hz
74VHC175M 74VHC175M ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 74VHC yes Obsolete 1 (Unlimited) RoHS Compliant Lead Free No 16 16-SOIC (0.154, 3.90mm Width) Surface Mount 143mg -40°C~85°C TA D-Type 74VHC175 Differential 1 Non-Inverting 4 15 ns 4.9 ns D-Type, Flip-Flop 4pF Master Reset Positive Edge 2V~5.5V 8 115MHz Positive Edge 8mA 8mA 9.3ns @ 5V, 50pF 4μA
5962-89513022A(IDT) 5962-89513022A(IDT) Teledyne e2v 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Active RoHS non-compliant 20 3-State Non-Inverting D-Type Bus Interface
74ACTQ74SJX 74ACTQ74SJX ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 74ACTQ Obsolete 1 (Unlimited) 5V RoHS Compliant Lead Free 14 14-SOIC (0.209, 5.30mm Width) Surface Mount -40°C~85°C TA D-Type 74ACTQ74 Differential Non-Inverting 2 8 ns 7 ns AND, D-Type, Flip-Flop 1 4.5pF Set(Preset) and Reset Positive Edge 4.5V~5.5V 1 200MHz Positive Edge 24mA 24mA 8ns @ 5V, 50pF 20μA
Settings Need Help?
Top FAQ's

How can I quickly find answers to my questions?

Please visit the Help & Support area of our website to find information regarding ordering, shipping, delivery and more.

What is my Order Status?

Registered users can track orders from their account dropdown, or click here. *Order Status may take 12 hours to update after initial order is placed.

How do I return product?

Users can begin the returns process by starting with our Returns Page.

How do I find price and availability?

Quotes can be created by registered users in myLists.

How do I create a 'HK JDW' Account?

Visit the Registration Page and enter the required information. You will receive an email confirmation when your registration is complete.

United Kingdom/GBP Summary
Fast Shipping Fast Delivery

Orders are typically delivered to United Kingdom within 48 hours depending on location.

Free Shipping Free Shipping

Free delivery to United Kingdom on orders of £33 or more. A delivery charge of £12 will be billed on all orders less than £33.

Incoterms Incoterms

DDP (Duty and customs paid by HK JDW)

Payment Options Payment Types

Credit account for qualified institutions and businesses

Payment in Advance by Wire Transfer

Visa Mastercard American Express PayPal Apple Pay Google Pay

Marketplace Marketplace Product

More Products From Fully Authorized Partners

Average Time to Ship 1-3 Days, extra ship charges may apply. Please see product page, cart, and checkout for actual ship speed.

Incoterms: CPT (Duty, customs, and applicable VAT/Tax due at time of delivery)

For more information visit Help & Support