Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

Linear Comparators

Compare Image Name Manufacturer Pricing(USD) Quantity Weight(Kg) Size(LxWxH) Datasheet Factory Lead Time Mount Packaging Published Series Pbfree Code Part Status Moisture Sensitivity Level (MSL) Number of Terminations ECCN Code Max Operating Temperature Min Operating Temperature Operating Supply Voltage Length RoHS Status Lead Free Contact Plating Radiation Hardening Number of Pins Package / Case Max Supply Voltage REACH SVHC Reach Compliance Code Min Supply Voltage Height Width Mounting Type Weight Operating Temperature Technology Operating Supply Current Max Supply Current Height Seated (Max) HTS Code Packing Method Number of Functions Nominal Supply Current 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 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 Power Supplies Supply Voltage-Max (Vsup) Max Power Dissipation Number of Elements Output Current Max Input Current Number of Circuits Output Current per Channel Input Offset Voltage (Vos) Input Bias Current Response Time Current - Output Propagation Delay Turn On Delay Time Min Dual Supply Voltage Neg Supply Voltage-Nom (Vsup) Power Dissipation-Max Quiescent Current Common Mode Rejection Ratio Supply Current-Max Hysteresis Voltage Gain Average Bias Current-Max (IIB) Power Supply Rejection Ratio (PSRR) Neg Supply Voltage-Max (Vsup) Supply Voltage Limit-Max Input Offset Voltage-Max Current - Input Bias Amplifier Type Voltage - Supply, Single/Dual (±) Bias Current-Max (IIB) @25C Voltage - Input Offset (Max) Current - Input Bias (Max) Current - Output (Typ) Current - Quiescent (Max) CMRR, PSRR (Typ) Propagation Delay (Max)
MAX941EUA+T MAX941EUA+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tape & Reel (TR) 2012 yes Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant Lead Free 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) 3mm Surface Mount -40°C~85°C BIPOLAR 1 with Latch, Shutdown e3 Matte Tin (Sn) DUAL GULL WING 260 3V NOT SPECIFIED MAX941 8 CMOS, Push-Pull, TTL YES 0.65mm S-PDSO-G8 Comparators Not Qualified 3/5V 1 80 ns 0.7mA 0.4μA 6.5V 2.7V~5.5V 3mV @ 5.5V 0.15μA @ 5.5V 700μA 81.94dB CMRR, 81.94dB PSRR 80ns
LMX393AKA+ LMX393AKA+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Bulk yes 1 8 EAR99 2.9mm RoHS Compliant compliant 1.625mm CMOS 1.45mm 8542.39.00.01 2 e3 Matte Tin (Sn) DUAL GULL WING NOT SPECIFIED 2.7V NOT SPECIFIED OPEN-DRAIN AUTOMOTIVE YES 0.65mm R-PDSO-G8 125°C -40°C Comparator 500 ns 0.4μA 6V 7000μV COMPARATOR
MAX999EUK+ MAX999EUK+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Cut Tape 2004 yes 1 5 EAR99 85°C -40°C 5V 2.9mm RoHS Compliant Tin No 5 SOT-23 5.5V No SVHC 2.7V 1.45mm 1.63mm 1 5mA e3 DUAL GULL WING 260 3V 5 INDUSTRIAL 1 Comparators 4mA 500μV 4.5 ns 571mW 80 dB 30μA 15μA COMPARATOR 30μA
MAX9600EUP+T MAX9600EUP+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2002 yes Active 1 (Unlimited) 20 EAR99 6.5mm ROHS3 Compliant Lead Free No 20 20-TSSOP (0.173, 4.40mm Width) 5V 1V 4.4mm Surface Mount -40°C~85°C BIPOLAR 12mA 1.1mm 2 12mA with Latch e3 Matte Tin (Sn) DUAL GULL WING 260 5V MAX9600 20 Complementary, Differential, ECL 0.65mm 879mW 2 50mA 5mV 6μA 500 ps -5.2V 24mA 65 dB 30mV -6V 5mV @ -5.2V 5V 6μA @ -5.2V5V 70dB CMRR, 65dB PSRR 0.5ns
LMX339HASD LMX339HASD Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount no 1 14 EAR99 125°C -40°C 8.65mm RoHS Compliant Lead Free No 14 SOIC 5.5V 1.8V 3.9mm 338.011364mg CMOS 200μA 1.75mm 4 General Purpose e0 Tin/Lead (Sn85Pb15) DUAL GULL WING 240 2.7V 20 14 AUTOMOTIVE 1.27mm Comparator 3/5V 4 7mV 500 ns 73mA 600 ns 300μA 70 dB 2 mV 93.98dB 250nA 0.25μA
MAX902CSD+T MAX902CSD+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2005 yes Active 1 (Unlimited) 14 EAR99 9V 8.65mm ROHS3 Compliant Lead Free Tin No 14 14-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount 0°C~70°C CMOS 4mA 1.75mm 2 4mA with Latch e3 DUAL GULL WING 260 5V MAX902 14 TTL Comparators 55/10GND/-5V 500mW 2 4mV 10μA 8 ns -5V 3mA 80 dB 15μA 80dB 6V 5V~10V ±2.5V~5V 4mV @ ±5V 10μA @ ±5V 8mA 6mA 3mA 82.5dB CMRR, 80dB PSRR
MAX9052BESA-T MAX9052BESA-T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2012 no Obsolete 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant 8-SOIC (0.154, 3.90mm Width) not_compliant 3.9mm Surface Mount -40°C~85°C BIPOLAR 1.75mm 2 with Voltage Reference e0 TIN LEAD DUAL GULL WING 245 5V NOT SPECIFIED MAX9052 8 CMOS, Push-Pull, Rail-to-Rail, TTL YES R-PDSO-G8 Comparator Not Qualified 3/5V 2 450 ns 0.13mA ±3mV 6V 2.7V~5.5V 5mV @ 5V 1pA @ 5V 8mA 85μA 80dB CMRR, 80dB PSRR 450ns
MAX934ESE MAX934ESE Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 1997 no Obsolete 1 (Unlimited) 16 EAR99 9.9mm ROHS3 Compliant 16-SOIC (0.154, 3.90mm Width) not_compliant 3.9mm Surface Mount -40°C~85°C 1.75mm 1 with Voltage Reference e0 Tin/Lead (Sn/Pb) DUAL GULL WING 245 5V NOT SPECIFIED MAX934 16 CMOS, TTL YES 1.27mm R-PDSO-G16 2.5V Not Qualified 11V 4 2.5V~11V ±1.25V~5.5V 10mV @ 5V 0.015mA @ 5V 8.5μA 80dB CMRR, 80dB PSRR 12μs
MAX9140AAXK+ MAX9140AAXK+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks 2015 yes 1 5 EAR99 2mm Non-RoHS Compliant 1.25mm BIPOLAR 1.1mm 8542.39.00.01 1 DUAL GULL WING NOT SPECIFIED 5V NOT SPECIFIED AUTOMOTIVE YES 0.65mm R-PDSO-G5 125°C -40°C Comparator 40 ns 0.35μA 6V 6000μV COMPARATOR
MAX901BCSE+T MAX901BCSE+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2005 yes Active 1 (Unlimited) 16 EAR99 9.9mm ROHS3 Compliant Lead Free No 16 16-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount 0°C~70°C CMOS -12mA 1.75mm 4 -12mA General Purpose e3 Matte Tin (Sn) DUAL GULL WING 260 5V MAX901 16 TTL 1.27mm Comparator 55/10GND/-5V 500mW 4 10μA 2mV 6μA 8 ns 8 ns -5V 15mA 80 dB 15μA 80dB -6V 6V 5V~10V ±2.5V~5V 4mV @ ±5V 10μA @ ±5V 15mA12mA6mA 82.5dB CMRR, 80dB PSRR
MAX9022AUA+T MAX9022AUA+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2007 yes Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant Lead Free No 8 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) 3mm Surface Mount -40°C~125°C 5.6μA 1.1mm 2 5.6μA General Purpose e3 Matte Tin (Sn) DUAL GULL WING 260 5V MAX9022 8 CMOS, Rail-to-Rail, TTL 0.65mm Comparator 727mW 2 3nA 1mV 3nA 8000 ns 8 μs 5μA 80 dB 4mV 6V 2.5V~5.5V ±1.25V~2.75V 1mV @ 5V 0.003μA @ 5V 5μA 100dB CMRR, 80dB PSRR
MAX9693ESE+ MAX9693ESE+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tube 2000 yes Active 1 (Unlimited) 16 EAR99 4.89mm ROHS3 Compliant Lead Free 16 16-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~85°C 1.73mm 2 with Latch e3 Matte Tin (Sn) DUAL GULL WING 260 5V NOT SPECIFIED MAX9693 16 Complementary, ECL YES 0.635mm Comparators Not Qualified 2 2 ns -5.2V 50mA 30μA -6V 6V 6.5mV @ 5V 20μA @ 5V 50mA 46mA 80dB CMRR, 60dB PSRR 1.8ns
MAX40009ANT+ MAX40009ANT+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube yes Active 1 (Unlimited) ROHS3 Compliant 6-XFBGA, WLPBGA Surface Mount -40°C~125°C General Purpose NOT SPECIFIED NOT SPECIFIED MAX40009 Push-Pull Comparator 1 3mV 1.7V~5.5V 5mV 140nA 17μA 850ns (Typ)
MAX901AESE/GG8 MAX901AESE/GG8 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount no EAR99 85°C -40°C RoHS Compliant 16 SOIC 10V 5V 8542.39.00.01 NOT SPECIFIED NOT SPECIFIED Comparator 2.5V COMPARATOR
MAX971CSA+T MAX971CSA+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tape & Reel (TR) 2003 yes Active 1 (Unlimited) 8 EAR99 ROHS3 Compliant 8-SOIC (0.154, 3.90mm Width) Surface Mount 0°C~70°C 1 with Voltage Reference e3 Matte Tin (Sn) DUAL GULL WING 260 3V NOT SPECIFIED MAX971 8 Open Drain YES R-PDSO-G8 Comparators Not Qualified 1 300000 ns 0.0038mA 50mV 2.5V~11V ±1.25V~5.5V 10mV @ 5V 0.015mA @ 5V 4μA 80dB CMRR, 80dB PSRR
MAX9017AEKA+TG0N MAX9017AEKA+TG0N Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2013 yes Obsolete 1 (Unlimited) 8 EAR99 2.9mm ROHS3 Compliant 1.625mm BICMOS 1.45mm 8542.39.00.01 TR 2 DUAL GULL WING NOT SPECIFIED 5V NOT SPECIFIED PUSH-PULL INDUSTRIAL YES 0.65mm R-PDSO-G8 85°C -40°C Comparator 28000 ns 0.0028mA 0.002μA 6V 10000μV COMPARATOR 0.001μA
MAX908ESD+ MAX908ESD+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 2006 yes Active 1 (Unlimited) 14 EAR99 5V 8.75mm ROHS3 Compliant Lead Free Tin No 14 14-SOIC (0.154, 3.90mm Width) Unknown 1.5mm 4mm Surface Mount -40°C~85°C BIPOLAR 1mA 4 1mA General Purpose e3 DUAL GULL WING 260 5V MAX908 14 TTL 1.27mm Comparators 5V 471mW 4 300nA 2mV 300nA 45 ns 50 ns 1mA 86.02 dB 0.5μA 86.02dB 6V 4.5V~11V 2mV @ 5V 0.3μA @ 5V 86.02dB CMRR, 86.02dB PSRR
MAX9077EKA+T MAX9077EKA+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2013 yes Active 1 (Unlimited) 8 EAR99 ROHS3 Compliant Lead Free Tin No 8 SOT-23-8 Unknown Surface Mount -40°C~85°C 6.6μA 1.45mm 2 6.6μA General Purpose e3 DUAL GULL WING 260 5V MAX9077 8 CMOS, Push-Pull, Rail-to-Rail, TTL 0.65mm Comparator 471mW 2 5nA 1mV -20nA 580 ns 580 ns 6.6μA 77 dB 77dB 6V 2.1V~5.5V 1mV @ 5V 0.005μA @ 5V 82dB CMRR, 77dB PSRR
MAX978ESE+T MAX978ESE+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2014 yes Active 1 (Unlimited) 16 EAR99 ROHS3 Compliant Lead Free Tin No 16 16-SOIC (0.154, 3.90mm Width) Surface Mount -40°C~85°C 120μA 4 120μA General Purpose e3 DUAL GULL WING 260 3V MAX978 16 CMOS, Rail-to-Rail, TTL 1.27mm Comparators 3/5V 667mW 4 75nA 2mV 75nA 28 ns 28 ns 650μA 100 dB 4mV 0.3μA 2.7V~5.5V 2mV @ 5V 0.075μA @ 5.5V 650μA 95dB CMRR, 100dB PSRR
MAX40002ANS+T MAX40002ANS+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tape & Reel (TR) Active 1 (Unlimited) EAR99 ROHS3 Compliant 4-XFBGA, WLBGA Surface Mount -40°C~125°C with Voltage Reference 260 30 MAX40002 Open Drain Comparator 1 8mV 1.7V~5.5V 10mV @ 3.3V 30nA 1.1μA 46dB PSRR (Min) 9μs (Typ)
MAX918EUK+T MAX918EUK+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2004 Beyond-the-Rails™ yes Active 1 (Unlimited) 5 EAR99 2.9mm ROHS3 Compliant Lead Free Tin No 5 SC-74A, SOT-753 Unknown Surface Mount -40°C~85°C 1.3μA 1 1.3μA with Voltage Reference e3 DUAL GULL WING 260 5V MAX918 5 Open-Drain, Rail-to-Rail Comparators 571mW 1 50mA 1nA 5mV 1nA 120000 ns 120 μs 1.6μA 80 dB 4mV 0.002μA 80dB 6V 1.8V~5.5V 5mV @ 5V 0.001μA @ 5V 1.6μA 80dB PSRR
MAX924CPE MAX924CPE Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2009 no Obsolete 1 (Unlimited) 16 EAR99 19.175mm Non-RoHS Compliant 16-DIP (0.300, 7.62mm) not_compliant 7.62mm Through Hole 0°C~70°C 4 with Voltage Reference e0 Tin/Lead (Sn/Pb) DUAL 245 3V NOT SPECIFIED MAX924 16 CMOS, TTL NO R-PDIP-T16 Comparator Not Qualified 3/5V 4 14000 ns 0.009mA -0.3V 12V 2.5V~11V ±1.25V~5.5V 10mV @ 5V 50mA 11μA 80dB CMRR, 80dB PSRR 12μs
MAX981CPA MAX981CPA Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2003 no Obsolete 1 (Unlimited) 8 EAR99 9.375mm ROHS3 Compliant 8-DIP (0.300, 7.62mm) not_compliant Through Hole 0°C~70°C 4.572mm 1 with Voltage Reference e0 Tin/Lead (Sn/Pb) DUAL 245 3V NOT SPECIFIED MAX981 8 Open Drain NO 2.54mm R-PDIP-T8 Comparator Not Qualified 1 300000 ns 0.0038mA 50mV 2.5V~11V ±1.25V~5.5V 10mV @ 5V 0.015mA @ 5V 4μA 80dB CMRR, 80dB PSRR
MAX9693EEE+T MAX9693EEE+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount yes 1 16 EAR99 85°C -40°C 9.9mm RoHS Compliant Lead Free No 16 QSOP 3.9mm 46mA 1.75mm 2 46mA e3 Matte Tin (Sn) DUAL GULL WING 260 5V 16 OPEN-EMITTER INDUSTRIAL 2 Comparator 6.5mV 2 ns 50mA 1.8 ns -5.2V 771.5mW 46mA 60 dB 70dB 30μA 60dB -6V 6V 20μA COMPARATOR
MAX9095ASD+ MAX9095ASD+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 2014 yes Active 1 (Unlimited) 14 EAR99 8.65mm ROHS3 Compliant No 14 14-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~125°C BICMOS 360μA 1.75mm 4 General Purpose DUAL GULL WING 2.7V MAX9095 Open Drain 1.27mm Comparator 1.8/5V 4 35mA 250nA 35mA 7mV 250nA 115 ns 110 ns 400μA 0.5mA 2mV 93.98dB 6V 1.8V~5.5V 7mV @ 5V 250nA @ 5V 35mA @ 5V 400μA
MAX976EUA MAX976EUA Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2014 no Obsolete 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) not_compliant 3mm Surface Mount -40°C~85°C 1.1mm 2 General Purpose e0 Tin/Lead (Sn/Pb) DUAL GULL WING 245 5V NOT SPECIFIED MAX976 8 CMOS, Rail-to-Rail, TTL YES 0.65mm S-PDSO-G8 Comparators Not Qualified 3/5V 2 28 ns 1.3mA 5mV 0.3μA 6V 2.7V~5.5V 2mV @ 5V 0.075μA @ 5.5V 650μA 95dB CMRR, 100dB PSRR 28ns
MAX9062EBS+ MAX9062EBS+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount 1 4 EAR99 85°C -40°C 1mm RoHS Compliant No 4 5.5V 1V 1mm BICMOS 0.67mm 1 BOTTOM BALL 3.3V 4 OPEN-DRAIN INDUSTRIAL 0.5mm Comparator 3.3V 0.0011mA 0.015μA COMPARATOR
MAX913CPA+ MAX913CPA+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Through Hole Tube 2003 yes Active 1 (Unlimited) 8 EAR99 9.375mm ROHS3 Compliant Lead Free No 8 8-DIP (0.300, 7.62mm) Unknown 7.62mm Through Hole 0°C~70°C BIPOLAR 10mA 4.572mm 1 10mA with Latch e3 Matte Tin (Sn) DUAL 260 5V MAX913 8 Complementary, TTL 2.54mm Comparator 5/+-5V 727mW 20mA 5μA 1 2mV 5μA 10 ns 14 ns 16 ns -5V 10mA 100 dB 70.88dB 100dB -7V 7V 5V~10V 2mV @ ±5V 5μA @ ±5V 20mA 110dB CMRR, 100dB PSRR
MAX516AEWG MAX516AEWG Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 2003 no Obsolete 1 (Unlimited) 24 EAR99 Non-RoHS Compliant Contains Lead No 24 24-SOIC (0.295, 7.50mm Width) Unknown Surface Mount -40°C~85°C 10mA 4 10mA General Purpose e0 Tin/Lead (Sn85Pb15) DUAL GULL WING 245 4.75V MAX516 24 CMOS, TTL 1.27mm Comparator 5/15V 650mW 4 300nA 800 ns 1.5 μs 800 ns 10mA 17V 10000μV 4.75V~16.5V 0.3μA @ 16.5V
MAX903MJA/HR MAX903MJA/HR Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Through Hole Bulk 125°C -55°C RoHS Compliant CDIP 10V 5V 2.5V
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