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 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 Operating Supply Voltage 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 Height Width Thickness Mounting Type Weight Operating Temperature Technology Operating Supply Current Max Supply Current Height Seated (Max) 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) Number of Channels Subcategory Qualification Status Power Supplies Supply Voltage-Max (Vsup) Max Power Dissipation Number of Elements Output Current Max Input Current Output Polarity Output Current per Channel Input Offset Voltage (Vos) Input Bias Current Response Time Current - Output Power Dissipation Propagation Delay Turn On Delay Time Max Dual Supply Voltage Min Dual Supply Voltage Neg Supply Voltage-Nom (Vsup) Supplier Device Package Power Dissipation-Max Output Characteristics Quiescent Current Common Mode Rejection Ratio Supply Current-Max Differential Output Hysteresis Voltage Gain Average Bias Current-Max (IIB) Power Supply Rejection Ratio (PSRR) Supply Voltage Limit-Max Input Offset Voltage-Max Current - Input Bias Amplifier Type Input Characteristics Receiver Number of Bits Receive Delay-Max 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)
LT1715CMS#TR LT1715CMS#TR Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 70°C 0°C RoHS Compliant Contains Lead 10 MSOP 12V 2.7V General Purpose TTL 2 2 2.5mV 4 ns 20mA 9 ns 6V 1.35V 2mA 80 dB 6 mV 80dB 6μA
MAX9109ESA-T MAX9109ESA-T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2007 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 with Latch e0 Tin/Lead (Sn/Pb) DUAL GULL WING 245 5V NOT SPECIFIED MAX9109 8 TTL YES R-PDSO-G8 Comparator Not Qualified 5V 1 25 ns 0.7mA 2mV 0.35μA 6V 4.5V~5.5V 1.6mV @ 5V 0.125μA @ 5V 700μA 86.02dB CMRR, 86.02dB PSRR 25ns
LT6700IS6-2#TRPBF LT6700IS6-2#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2013 Over-The-Top® Active 1 (Unlimited) 6 EAR99 ROHS3 Compliant SOT-23-6 Thin, TSOT-23-6 Surface Mount -40°C~85°C 1mm 2 with Voltage Reference e3 Matte Tin (Sn) DUAL GULL WING 260 5V 30 LT6700 6 Open Collector YES 0.95mm R-PDSO-G6 Comparator Not Qualified 1.4/18V 2 29000 ns 0.017mA 11.5mV 0.015μA 18.5V 1.4V~18V 0.01μA @ 18V 17μA 29μs
MAX9201EUE+TG002 MAX9201EUE+TG002 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) Obsolete 1 (Unlimited) ROHS3 Compliant
ADCMP608BKSZ-REEL7 ADCMP608BKSZ-REEL7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 weeks ago) Tape & Reel (TR) no Active 1 (Unlimited) 6 EAR99 2.2mm ROHS3 Compliant Contains Lead Gold No 6 6-TSSOP, SC-88, SOT-363 No SVHC 1mm 1.35mm Surface Mount -40°C~125°C 500μA 1.3mA 1 500μA General Purpose e4 DUAL GULL WING 260 3.3V 40 ADCMP608 6 CMOS, Rail-to-Rail, TTL YES Comparator 3.3V 7.15mW 1 50mA 400nA 3mV 400nA 60 ns 1mW 60 ns 60 ns 1.3mA 45 dB 80dB 0.4μA 50dB 6V 2.5V~5.5V 3mV @ 2.5V 0.4μA @ 2.5V 45dB CMRR, 50dB PSRR
TLC354IN TLC354IN Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 no 14 EAR99 19.305mm Non-RoHS Compliant Contains Lead PDIP not_compliant 7.62mm CMOS 5.08mm 4 DUAL THROUGH-HOLE NOT SPECIFIED 5V NOT SPECIFIED 14 OPEN-DRAIN INDUSTRIAL NO 85°C 4 Comparator Not Qualified 5V 650 ns 0.002μA 18V 7000μV COMPARATOR 0.002μA
LTC1842IS8 LTC1842IS8 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 1 8 EAR99 85°C -40°C 4.9mm RoHS Compliant Contains Lead No 8 S 11V 2V 3.9mm 1.75mm 2 e0 DUAL GULL WING 235 3V 20 OPEN-DRAIN YES 2 Comparator 10mV 60 μs 500mW 12 μs 5.5V 1.25V 5.7μA 80 dB 50 mV 80dB COMPARATOR
TLC393QDRG4 TLC393QDRG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 16 Weeks ACTIVE (Last Updated: 4 days ago) Surface Mount Tape & Reel (TR) LinCMOS™ yes Active 1 (Unlimited) 8 EAR99 5V 4.9mm ROHS3 Compliant Lead Free No 8 8-SOIC (0.154, 3.90mm Width) 1.75mm 3.91mm 1.58mm Surface Mount 75.891673mg -40°C~125°C 40μA TR 2 40μA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V TLC393 8 MOS, Open-Drain Comparator 5V 725mW 2 20mA 6mA 5mV 5pA 2500 ns 725mW 4.5 μs 90μA 84 dB 4V~16V 5mV @ 10V 5pA @ 5V 90μA 84dB CMRR
MAX9648AUK+T MAX9648AUK+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Strip 2015 yes Active 1 (Unlimited) 5 EAR99 125°C -40°C 2.9mm ROHS3 Compliant Tin No 5 SOT-23-5 5.5V Unknown 2.7V BICMOS 100μA 1 100μA General Purpose DUAL GULL WING 2.7V 5 AUTOMOTIVE 4 Comparator 571mW 1 35mA 250nA 7mV 400nA 70 ns 110 ns 120μA 90 dB 113.98dB
LT1015CN8 LT1015CN8 Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 1996 Obsolete 1 (Unlimited) 8 EAR99 Non-RoHS Compliant LATCH FUNCTION 8-DIP (0.300, 7.62mm) not_compliant Through Hole 0°C~70°C BIPOLAR 3.937mm 1 General Purpose e0 Tin/Lead (Sn/Pb) DUAL NOT SPECIFIED 5V NOT SPECIFIED LT1015 8 TTL NO R-PDIP-T8 4.6V Not Qualified 5.4V 2 TRUE TOTEM-POLE NO DIFFERENTIAL 2 14 ns 4.6V~5.4V 70mA
TLV3402CDRG4 TLV3402CDRG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks ACTIVE (Last Updated: 5 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 75.891673mg 0°C~70°C 640nA TR 2 640nA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 2.7V TLV3402 8 CMOS, Open-Drain Comparator 710mW 2 10mA 3.6mV 250pA 175000 ns 710mW 300 μs 950nA 88 dB 120dB 0.0001μA 105dB 17V 2.5V~16V ±1.25V~8V 3.6mV @ 15V 250pA @ 15V 950nA 88dB CMRR, 105dB PSRR
AD8468WBKSZ-R7 AD8468WBKSZ-R7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 1 month ago) Tape & Reel (TR) no Active 1 (Unlimited) 6 EAR99 2.2mm ROHS3 Compliant Contains Lead Tin 6 6-TSSOP, SC-88, SOT-363 No SVHC 1mm 1.35mm Surface Mount -40°C~125°C 800μA 1 800μA General Purpose e4 NICKEL PALLADIUM GOLD DUAL GULL WING 260 2.5V 30 AD8468 6 CMOS, Rail-to-Rail, TTL YES Comparator Not Qualified 3/5V 7.15mW 1 50mA 400nA 50mA 10mV 400nA 50 ns 2mW 60 ns 60 ns 1.3mA 45 dB 90dB 0.4μA 50dB 6V 2.5V~5.5V 10mV @ 2.5V 0.4μA @ 2.5V 1.3mA 45dB CMRR, 50dB PSRR
LMV761MA/NOPB LMV761MA/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 3 days ago) Surface Mount Tube yes Active 1 (Unlimited) 8 EAR99 3V 4.9mm ROHS3 Compliant Lead Free Tin No 8 8-SOIC (0.154, 3.90mm Width) No SVHC 1.75mm 3.91mm 1.58mm Surface Mount -40°C~125°C 700μA 1 700μA General Purpose e3 DUAL GULL WING 260 2.7V LMV761 8 Push-Pull Comparator 2.7/5V 1 40mA 200μV 50pA 120 ns 225 ns 700μA 100 dB 0.000005μA 110dB 5.5V 2.7V~5V 0.2mV @ 5V 50pA @ 5V 100dB CMRR, 110dB PSRR
TLC339IN TLC339IN Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks ACTIVE (Last Updated: 5 days ago) Through Hole Tube LinCMOS™ yes Active 1 (Unlimited) 14 EAR99 5V 19.3mm ROHS3 Compliant Lead Free No 14 14-DIP (0.300, 7.62mm) 5.08mm 6.35mm 3.9mm Through Hole 927.99329mg -40°C~85°C 20μA 4 80μA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL 5V TLC339 14 CMOS, Open-Drain Comparator 5V 1.15W 4 20mA 6mA 5mV 5pA 2500 ns 1.15W 4.5 μs 125μA 84 dB 0.000002μA 85dB 18V 3V~16V 5mV @ 10V 5pA @ 5V 125μA 84dB CMRR
TLC393IDRG4 TLC393IDRG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 4 days ago) Surface Mount Tape & Reel (TR) LinCMOS™ yes Active 1 (Unlimited) 8 EAR99 5V 4.9mm ROHS3 Compliant Lead Free No 8 8-SOIC (0.154, 3.90mm Width) 1.75mm 3.91mm 1.58mm Surface Mount 72.603129mg -40°C~85°C 40μA TR 2 40μA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V TLC393 8 MOS, Open-Drain Comparator 5V 725mW 2 20mA 5pA 6mA 5mV 5pA 2500 ns 725mW 4.5 μs 65μA 84 dB 85dB 3V~16V 5mV @ 10V 5pA @ 5V 65μA 84dB CMRR
LTC6752IMS8-2#PBF LTC6752IMS8-2#PBF Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 PRODUCTION (Last Updated: 1 month ago) Surface Mount 85°C -40°C RoHS Compliant 8 MSOP No SVHC General Purpose 1 5.5mV 3.4 ns 19mA 5.3 ns 2.65mA 1.6μA
MAX942CSA+TG002 MAX942CSA+TG002 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) Obsolete 1 (Unlimited) ROHS3 Compliant
MAX992ESA MAX992ESA Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2007 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 1.75mm 2 General Purpose e0 TIN LEAD DUAL GULL WING 245 2.7V NOT SPECIFIED MAX992 8 CMOS, Open-Drain, Rail-to-Rail, TTL YES R-PDSO-G8 Comparator Not Qualified 2 210 ns ±2.5mV 0.01μA 6V 2.5V~5.5V ±1.25V~2.75V 5mV @ 5.5V 1pA @ 5.5V 96μA 80dB CMRR, 80dB PSRR 210ns
NJM12903M(TE1) NJM12903M(TE1) New Japan Radio (NJR) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000
MAX9016AEKA+T MAX9016AEKA+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Strip 2010 yes Active 1 (Unlimited) 8 EAR99 85°C -40°C 3mm ROHS3 Compliant Lead Free No 8 SOT-23 5.5V 1.8V 1.3mm 1.75mm BICMOS 1.7μA 1 1.7μA e3 Matte Tin (Sn) DUAL GULL WING 260 5V 8 OPEN-DRAIN INDUSTRIAL 0.65mm 1 Comparators 5V 727mW 50mA 1nA 5mV 1nA 31000 ns 31 μs 2μA 80 dB 4 mV 80dB COMPARATOR
CMP04FSZ-REEL CMP04FSZ-REEL Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 4 weeks ago) Tape & Reel (TR) no Active 1 (Unlimited) 14 EAR99 8.65mm ROHS3 Compliant Contains Lead Tin No 14 14-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~85°C BIPOLAR 800μA 2mA 1.75mm 4 800μA General Purpose e3 DUAL GULL WING 260 5V 30 CMP04 14 CMOS, DTL, ECL, MOS, Open-Collector, TTL YES 1.27mm Comparator 5V 4 16mA 100nA 1mV 100nA 1.3 μs 6mW 3mA 100 dB 106.02dB 0.2μA 100dB 36V 3.3V~36V ±1.65V~18V 1mV @ 5V 0.1μA @ 5V 16mA @ 5V 100dB CMRR, 100dB PSRR
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
MAX913CSA MAX913CSA Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube Obsolete 1 (Unlimited) Non-RoHS Compliant 8-SOIC (0.154, 3.90mm Width) Surface Mount 0°C~70°C with Latch Complementary, TTL 1 8-SOIC 5V~10V 2mV @ ±5V 5μA @ ±5V 20mA 10mA 110dB CMRR, 100dB PSRR 14ns
MAX961EUA MAX961EUA Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2012 Beyond-the-Rails™ 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 General Purpose e0 Tin/Lead (Sn/Pb) DUAL GULL WING 245 3V NOT SPECIFIED MAX961 8 CMOS, Complementary, TTL YES 0.65mm S-PDSO-G8 Comparator Not Qualified 3/5V 1 4.5 ns 3.5mV 30μA 5.5V 2.7V~5.5V 1.5mV @ 5V 15μA @ 5V 11mA 80dB CMRR, 86.02dB PSRR 7ns
TLV3494AIDG4 TLV3494AIDG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount yes 2 14 EAR99 125°C -40°C 5V 8.65mm RoHS Compliant Contains Lead No 14 SOIC 5.5V 1.8V 1.58mm 3.91mm 129.387224mg CMOS 1.2μA 4 1.2μA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V 14 AUTOMOTIVE 1.27mm 4 Comparator 15mV 6 μs 5mA 13.5 μs 1.2μA 74 dB 0.00001μA 69.12dB 10pA 0.00001μA
LM2903DRG3 LM2903DRG3 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 8 Weeks ACTIVE (Last Updated: 1 day ago) Surface Mount Tape & Reel (TR) yes Active 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant Lead Free Tin No 8 8-SOIC (0.154, 3.90mm Width) 1.75mm 3.91mm 1.58mm Surface Mount -40°C~125°C BIPOLAR 800μA TR 2 1mA Differential e3 DUAL GULL WING 260 5V LM2903 8 CMOS, MOS, Open-Drain, TTL Comparator 5V 2 20mA 250nA 7mV 250nA 1.3 μs 2.5mA 100dB 0.05μA 36V 2V~36V ±1V~18V 7mV @ 30V 0.25μA @ 5V 2.5mA
LM339D LM339D Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube yes Obsolete 1 (Unlimited) 14 EAR99 8.65mm Non-RoHS Compliant 14-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount 0°C~70°C BIPOLAR 1.75mm 4 General Purpose e4 NICKEL PALLADIUM GOLD DUAL GULL WING 260 5V NOT SPECIFIED 14 CMOS, DTL, ECL, MOS, Open-Collector, TTL YES 1.27mm Comparator Not Qualified 4 1300 ns 36V 2V~32V ±1V~16V 5mV @ 30V 0.25μA @ 5V 16mA @ 5V 2.5mA
TL3116IPWG4 TL3116IPWG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Rail/Tube yes 1 8 EAR99 85°C -40°C 4.4mm RoHS Compliant Contains Lead No 8 TSSOP 10V 5V 3mm 39.008944mg BIPOLAR 14.7mA 1 14.7mA General Purpose e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V 8 TTL INDUSTRIAL 0.65mm 1 Comparator 1.1μA 3mV 9.9 ns 20mA 525mW 12 ns 5V 2.5V -5V 525mW 15mA 100 dB 100dB 1.1μA
LTC6702ITS8#TRPBF LTC6702ITS8#TRPBF Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download PRODUCTION (Last Updated: 3 weeks ago) Surface Mount Tape & Reel (TR) 85°C -40°C RoHS Compliant 8 SOT-23-8 5.5V 1.7V 64μA General Purpose TTL 2 3.5mV 450 ns 32μA 65 dB 5 mV 65dB
LTC1841CS8#TRPBF LTC1841CS8#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 1998 Active 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant 8-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount 0°C~70°C CMOS 1.75mm 2 General Purpose e3 Matte Tin (Sn) DUAL GULL WING 250 3V NOT SPECIFIED LTC1841 8 Open Drain YES R-PDSO-G8 Comparator Not Qualified 2 5000 ns 0.0057mA 2V~11V ±1V~5.5V 10mV @ 5V 5.7μA 80dB CMRR, 80dB PSRR 12μs
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