Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

Voltage Reference

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 ECCN Code Max Operating Temperature Min Operating Temperature Length RoHS Status Lead Free Current Rating Radiation Hardening Number of Pins Additional Feature Package / Case REACH SVHC Reach Compliance Code Height Width Thickness Mounting Type Weight Operating Temperature Technology Operating Supply Current Max Supply Current Height Seated (Max) HTS Code Number of Functions Nominal Supply Current Max Input Voltage 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 Temperature Grade Surface Mount Terminal Pitch JESD-30 Code Supply Voltage-Min (Vsup) Operating Temperature (Max) Operating Temperature (Min) Number of Channels Subcategory Qualification Status Supply Voltage-Max (Vsup) Max Power Dissipation Output Voltage Number of Outputs Voltage - Output Voltage - Input Max Output Current Trim/Adjustable Output Analog IC - Other Type Output Voltage-Max Tolerance Temperature Coefficient Current - Output Min Input Voltage Supply Current-Max (Isup) Watchdog Timer Adjustable Threshold Min Reset Threshold Voltage Max Reset Threshold Voltage Supplier Device Package Max Output Voltage Quiescent Current Voltage Tolerance-Max Reference Voltage Min Output Voltage Reference Type Output Voltage-Min Current - Cathode Voltage - Output (Min/Fixed) Temp Coef of Voltage-Max Noise - 0.1Hz to 10Hz Noise - 10Hz to 10kHz Voltage - Output (Max) Voltage Reference
MAX6071AAUT21+T MAX6071AAUT21+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2016 yes Active 1 (Unlimited) 6 EAR99 2.9mm ROHS3 Compliant SOT-23-6 Surface Mount -40°C~125°C TA BIPOLAR 260μA 1 5.5V DUAL GULL WING NOT SPECIFIED 5V NOT SPECIFIED MAX6071 Fixed 0.95mm R-PDSO-G6 1 Voltage References Not Qualified 2.048V 1 2.7V~5.5V NO THREE TERMINAL VOLTAGE REFERENCE ±0.04% 6ppm/°C 10mA 2.7V 200μA 2.048V Series 6 ppm/°C 6.4μVp-p 8.6μVrms
REF01EP-G106 REF01EP-G106 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Through Hole 2007 no 1 (Unlimited) 8 EAR99 70°C 0°C 9.375mm RoHS Compliant No 8 OUTPUT VOLTAGE ADJUSTABLE 3 PERCENT PDIP 7.62mm BIPOLAR 4.572mm 1 40V e0 TIN LEAD DUAL 245 15V 8 COMMERCIAL 2.54mm 13V Voltage References 33V 10V 1 10V YES THREE TERMINAL VOLTAGE REFERENCE 0.3%
LM4041AIZ-1.2/NOPB LM4041AIZ-1.2/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 1 week ago) Through Hole Bulk yes Active 1 (Unlimited) 3 EAR99 4.3mm ROHS3 Compliant Lead Free No 3 TO-226-3, TO-92-3 (TO-226AA) No SVHC 5.34mm 4.3mm 3.6mm Through Hole -40°C~85°C TA BIPOLAR 1 e3 Matte Tin (Sn) BOTTOM LM4041 3 Fixed 1 Voltage References 1.225V 1 12mA NO TWO TERMINAL VOLTAGE REFERENCE ±0.1% 100ppm/°C 1.225V 1.2V Shunt 65μA 20μVrms
TL4050C25QDCKT TL4050C25QDCKT Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) yes Discontinued 1 (Unlimited) 5 EAR99 2mm ROHS3 Compliant Contains Lead No 5 5-TSSOP, SC-70-5, SOT-353 Surface Mount -40°C~125°C TA BIPOLAR 1 e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 TL4050 5 Fixed YES 1 Voltage References 2.5V 1 15mA NO TWO TERMINAL VOLTAGE REFERENCE ±0.5% 50ppm/°C 2.5V Shunt 65μA 41μVrms
MAX6331LUR-T MAX6331LUR-T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 2006 no Obsolete 1 (Unlimited) 3 EAR99 2.92mm Non-RoHS Compliant Contains Lead 3 TO-236-3, SC-59, SOT-23-3 Surface Mount -40°C~85°C TA 1 e0 DUAL GULL WING 245 MAX6331 3 Fixed 0.95mm 1 Voltage References 320mW 5V POWER SUPPLY SUPPORT CIRCUIT ±1.4% 40ppm/°C Typical 50mA No NO 4.56V 4.69V 5V Shunt 60μA
LTC6652BHMS8-2.5#PBF LTC6652BHMS8-2.5#PBF Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 PRODUCTION (Last Updated: 4 weeks ago) Surface Mount 125°C -40°C RoHS Compliant Lead Free 8 MSOP No SVHC 350μA 1 2.5V 0.1% 10 ppm/°C 5mA 2.5V 350μA Series 2.5V
TL430CLPRE3 TL430CLPRE3 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tape & Reel (TR) yes 3 EAR99 70°C 0°C RoHS Compliant Contains Lead No 3 TO-226 213.188414mg BIPOLAR 1 30V e3 Matte Tin (Sn) BOTTOM WIRE 3 COMMERCIAL NO 2.75V 1 Voltage References 2.75V 1 30V 100mA YES THREE TERMINAL VOLTAGE REFERENCE 5% 120 ppm/°C 100mA 30V Adjustable, Shunt 2mA
LT1790AIS6-3#TRMPBF LT1790AIS6-3#TRMPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 months ago) Surface Mount Tape & Reel (TR) 2009 Active 1 (Unlimited) 6 EAR99 2.95mm ROHS3 Compliant Lead Free 6 SOT-23-6 Thin, TSOT-23-6 Surface Mount -40°C~85°C TA BIPOLAR 80μA 1 e3 Matte Tin (Sn) DUAL GULL WING 260 3.5V 30 LT1790 6 Fixed 0.95mm 3.5V 1 Voltage References Not Qualified 3V 1 3.5V~18V NO THREE TERMINAL VOLTAGE REFERENCE ±0.05% 10ppm/°C 5mA 3V 60μA 3V Series 50μVp-p 56μVrms
MAX6143AASA33+ MAX6143AASA33+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 2004 yes Active 1 (Unlimited) 8 EAR99 5mm ROHS3 Compliant Lead Free No 8 8-SOIC (0.154, 3.90mm Width) Unknown 1.5mm 4mm Surface Mount -40°C~125°C TA BICMOS 650μA 650μA 1 600μA 40V e3 Matte Tin (Sn) DUAL GULL WING 260 10V MAX6143 8 Fixed 1.27mm 5.3V Voltage References 3.3V 1 5.3V~40V 30mA YES THREE TERMINAL VOLTAGE REFERENCE ±0.06% 3ppm/°C 4.5V 2.5015V 3.3V 3.3V Series 3 ppm/°C 5μVp-p 9.3μVrms
REF3012AIDBZRG4 REF3012AIDBZRG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks ACTIVE (Last Updated: 2 days ago) Tape & Reel (TR) yes Active 1 (Unlimited) 3 EAR99 2.92mm ROHS3 Compliant Lead Free No 3 TO-236-3, SC-59, SOT-23-3 No SVHC 1.22mm 1.3mm 1mm Surface Mount 1.437803g -40°C~125°C TA CMOS 50μA 50μA 1 5.5V e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V REF3012 3 Fixed YES 0.96mm Voltage References 1.25V 1 1.8V~5.5V 25mA NO THREE TERMINAL VOLTAGE REFERENCE ±0.2% 75ppm/°C 1.8V 1.25V 42μA 1.25V 1.25V Series 75 ppm/°C 14μVp-p 42μVrms
AZ431LANTR-G1 AZ431LANTR-G1 Diodes Incorporated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 23 Weeks Surface Mount Tape & Reel (TR) 2014 Active 3 (168 Hours) 125°C -40°C ROHS3 Compliant No 3 TO-236-3, SC-59, SOT-23-3 Surface Mount -40°C~125°C TA 18V Adjustable 18V 100mA ±0.5% 20ppm/°C Typical 100mA SOT-23 18V 1.24V Shunt 80μA 1.24V 18V
ZRC250F01TC ZRC250F01TC Diodes Incorporated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) Obsolete 1 (Unlimited) 3 EAR99 2.86mm TO-236-3, SC-59, SOT-23-3 compliant 1.3mm Surface Mount -40°C~85°C TA BIPOLAR 1.1mm 8542.39.00.01 1 e3 MATTE TIN DUAL GULL WING 260 40 ZRC250 3 Fixed YES 0.95mm R-PDSO-G3 Not Qualified 2.5V 1 NO TWO TERMINAL VOLTAGE REFERENCE 2.525V ±1% 90ppm/°C 5mA Shunt 2.475V 20μA 2.5V 90 ppm/°C 60μVrms
LM385Z-1.2/NOPB LM385Z-1.2/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 3 days ago) Through Hole Bulk yes Active 1 (Unlimited) 3 EAR99 4.3mm ROHS3 Compliant Lead Free No 3 TO-226-3, TO-92-3 (TO-226AA) No SVHC 5.34mm 4.3mm 3.6mm Through Hole 113.398093g 0°C~70°C TA BIPOLAR 1 10μA 1.235V e3 Matte Tin (Sn) BOTTOM LM385 Fixed 1 Voltage References 1.235V 1 20mA NO TWO TERMINAL VOLTAGE REFERENCE -2.43% +2.02% 150ppm/°C 20mA 1.235V 1.235V Shunt 15μA 60μVrms
MAX6033CAUT25+T MAX6033CAUT25+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks yes Active 1 6 RoHS Compliant compliant BICMOS e3 Matte Tin (Sn) DUAL GULL WING 225 NOT SPECIFIED AUTOMOTIVE YES 0.95mm R-PDSO-G6 125°C -40°C Voltage References Not Qualified 2.5V NO 0.1% 40 ppm/°C
MAX6043CAUT25#TG16 MAX6043CAUT25#TG16 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2012 yes Obsolete 1 (Unlimited) 6 EAR99 2.9mm ROHS3 Compliant No 6 SOT-23-6 Surface Mount -40°C~125°C TA BICMOS 650μA 1.45mm 8542.39.00.01 1 42V e3 Matte Tin (Sn) DUAL GULL WING 5V MAX6043 6 Fixed 0.95mm 4.5V 40V 10V 1 4.5V~40V 10mA NO THREE TERMINAL VOLTAGE REFERENCE ±0.5% 65ppm/°C 2.5V Series 2.5V 4μVp-p 7μVrms
LT1461CCS8-2.5#PBF LT1461CCS8-2.5#PBF Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 PRODUCTION (Last Updated: 2 weeks ago) Surface Mount 70°C 0°C RoHS Compliant Lead Free 8 SOIC No SVHC 70μA 20V Fixed 2.5V 0.08% 5 ppm/°C 100mA 3V 2.5V 50μA 2.5V Series 2.5V
ADR366AUJZ-R2 ADR366AUJZ-R2 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) no Active 1 (Unlimited) 5 EAR99 2.9mm ROHS3 Compliant Contains Lead No 5 SOT-23-5 Thin, TSOT-23-5 No SVHC 900μm 1.6mm Surface Mount -40°C~125°C TA BIPOLAR 190μA 1 18V e3 Matte Tin (Sn) DUAL GULL WING 260 4.2V 40 ADR366 5 Fixed YES Voltage References 3.3V 1 3.6V~15V 5mA YES THREE TERMINAL VOLTAGE REFERENCE ±0.25% 25ppm/°C 3.6V 3.3V 3.3V 3.3V Series 9.3μVp-p
LM385BXMX-1.2/NOPB LM385BXMX-1.2/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks ACTIVE (Last Updated: 4 days ago) Surface Mount Tape & Reel (TR) yes Active 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant Lead Free No 8 8-SOIC (0.154, 3.90mm Width) 1.75mm 3.91mm 1.58mm Surface Mount 0°C~70°C TA BIPOLAR 1 e3 Matte Tin (Sn) DUAL GULL WING 260 LM385 Fixed 1 Voltage References 1.235V 1 20mA NO TWO TERMINAL VOLTAGE REFERENCE ±1% 30ppm/°C 1.235V Shunt 15μA 60μVrms
LM4050AIM3-3.0-T LM4050AIM3-3.0-T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount 1 (Unlimited) 3 EAR99 125°C -40°C 2.92mm RoHS Compliant No 3 BICMOS 1.12mm 1 e0 Tin/Lead (Sn85Pb15) DUAL GULL WING 240 20 3 AUTOMOTIVE Voltage References 3V 1 3V 15mA NO TWO TERMINAL VOLTAGE REFERENCE 0.1% 50 ppm/°C
ADR425BRZ-REEL7 ADR425BRZ-REEL7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 20 Weeks PRODUCTION (Last Updated: 2 weeks ago) Tape & Reel (TR) XFET® no Active 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant Contains Lead No 8 OUTPUT VOLTAGE CAN BE ADJUSTED OVER A +/-0.5% RANGE USING TRIM PIN 8-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~125°C TA 500μA 1 500μA 18V e3 Matte Tin (Sn) DUAL GULL WING 260 30 ADR425 8 Fixed YES 7V 1 Voltage References 5V 1 7V~18V 10mA YES THREE TERMINAL VOLTAGE REFERENCE ±0.04% 3ppm/°C 5V 500μA 5V Series 3 ppm/°C 3.4μVp-p
LM4041DIM3-1.2-T LM4041DIM3-1.2-T Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) yes Obsolete 1 (Unlimited) 3 2.92mm Non-RoHS Compliant TO-236-3, SC-59, SOT-23-3 unknown 1.3mm Surface Mount -40°C~85°C TA BICMOS 1.12mm 1 e0 TIN LEAD DUAL GULL WING 240 20 3 Fixed YES 0.95mm R-PDSO-G3 1.225V 1 NO TWO TERMINAL VOLTAGE REFERENCE 1.2373V ±1% 150ppm/°C 12mA Shunt 1.2128V 65μA 1.225V 150 ppm/°C 20μVrms
LM4041CIM3X-ADJ LM4041CIM3X-ADJ Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) Obsolete 1 (Unlimited) 3 EAR99 2.92mm Non-RoHS Compliant Contains Lead No 3 TO-236-3, SC-59, SOT-23-3 Surface Mount -40°C~85°C TA BIPOLAR 1 e0 Tin/Lead (Sn/Pb) DUAL GULL WING 260 LM4041 3 Adjustable 0.95mm 1 Voltage References 10V 1 12mA YES TWO TERMINAL VOLTAGE REFERENCE ±0.5% 100ppm/°C 10V 1.233V Shunt 65μA 20μVrms
LT1034CZ-2.5#TRPBF LT1034CZ-2.5#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Tape & Reel (TR) Active 1 (Unlimited) 3 EAR99 ROHS3 Compliant ALSO CONTAINS AN AUXILIARY REFERENCE OF 7V TO-226-3, TO-92-3 (TO-226AA) (Formed Leads) Through Hole 0°C~70°C TA 8542.39.00.01 1 e3 MATTE TIN BOTTOM 250 NOT SPECIFIED LT1034 3 Fixed NO O-PBCY-T3 Not Qualified 2.5V 2 NO TWO TERMINAL VOLTAGE REFERENCE 2.57V ±1.6% 40ppm/°C - 20mA 0.03mA Shunt, Dual 2.43V 30μA 2.5V 7V 40 ppm/°C 6μVp-p
REF02Z REF02Z Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Through Hole Bulk no 1 8 EAR99 125°C -55°C RoHS Compliant 8 OUTPUT VOLTAGE ADJUSTABLE 6 PERCENT CDIP 7.62mm BIPOLAR 1 40V e0 Tin/Lead (Sn/Pb) DUAL 245 15V NOT SPECIFIED 8 MILITARY 2.54mm 7V Voltage References Not Qualified 33V 5V 1 5V YES THREE TERMINAL VOLTAGE REFERENCE 1.4mA 0.5% 25 ppm/°C
TL431BCDBVR TL431BCDBVR Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 2 days ago) Tape & Reel (TR) yes Active 1 (Unlimited) 5 EAR99 2.9mm ROHS3 Compliant Lead Free No 5 SC-74A, SOT-753 1.45mm 1.6mm 1.2mm Surface Mount 15.790684mg 0°C~70°C TA BIPOLAR 1 37V e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 TL431 5 Adjustable YES 1 Voltage References 36V 1 100mA YES THREE TERMINAL VOLTAGE REFERENCE ±0.5% 34 ppm/°C 36V Shunt 600μA 2.495V 92 ppm/°C
MAX810MTR MAX810MTR Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Non-RoHS Compliant
LM4041BIM3-1.2-T LM4041BIM3-1.2-T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) no Obsolete 1 (Unlimited) 3 EAR99 2.92mm Non-RoHS Compliant Contains Lead No 3 TO-236-3, SC-59, SOT-23-3 Surface Mount -40°C~85°C TA BICMOS 1 e0 DUAL GULL WING 240 20 LM4041 3 Fixed 0.95mm 1 Voltage References 1.225V 1 12mA NO TWO TERMINAL VOLTAGE REFERENCE ±0.2% 100ppm/°C 1.225V Shunt 60μA 20μVrms
LM4040BIM3-4.1 LM4040BIM3-4.1 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 NRND (Last Updated: 4 days ago) Surface Mount Tape & Reel (TR) Not For New Designs 1 (Unlimited) 3 EAR99 2.92mm Non-RoHS Compliant Contains Lead 15A No 3 TO-236-3, SC-59, SOT-23-3 No SVHC 1.22mm 1.3mm 1mm Surface Mount -40°C~85°C TA BIPOLAR 1 60mA e0 Tin/Lead (Sn/Pb) DUAL GULL WING 260 LM4040 3 Fixed 0.95mm Voltage References 4.096V 1 15mA NO TWO TERMINAL VOLTAGE REFERENCE ±0.2% 100ppm/°C 4.096V 4.096V 4.096V Shunt 73μA 100 ppm/°C 80μVrms
LT1236ACS8-10#TRPBF LT1236ACS8-10#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 weeks ago) Surface Mount Tape & Reel (TR) 1996 Active 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant Contains Lead 8 8-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount 0°C~70°C TA BIPOLAR 2mA 1.75mm 1 e3 Matte Tin (Sn) DUAL GULL WING 250 NOT SPECIFIED LT1236 8 Fixed 1.27mm Voltage References Not Qualified 10V 1 11.5V~40V YES THREE TERMINAL VOLTAGE REFERENCE ±0.05% 5ppm/°C 10mA 10V 1.7mA 10V Series, Shunt, Buried Zener 5 ppm/°C 6μVp-p 3.5μVrms
LT1460JCS3-2.5#TRPBF LT1460JCS3-2.5#TRPBF Analog Devices, Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download PRODUCTION (Last Updated: 2 weeks ago) Surface Mount Tape & Reel (TR) 70°C 0°C RoHS Compliant Lead Free 3 TO-236-3 1 2.5V 0.4% 20 ppm/°C 40mA 2.5V 145μA Series
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