Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

DAC

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 Length RoHS Status Lead Free Contact Plating Radiation Hardening Number of Pins Additional Feature Package / Case Interface Max Supply Voltage REACH SVHC Reach Compliance Code Min Supply Voltage Height Width Thickness Mounting Type Weight Operating Temperature Technology 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 Signal to Noise Ratio (SNR) Operating Temperature (Max) Operating Temperature (Min) Number of Channels Subcategory Qualification Status Power Supplies Max Power Dissipation Polarity Slew Rate Min Input Voltage Power Dissipation Max Dual Supply Voltage Min Dual Supply Voltage Max Output Voltage Power Dissipation-Max Power Consumption Dual Supply Voltage Resolution Number of Bits Supply Current-Max Differential Output Supply Type Min Output Voltage Number of Converters Negative Supply Voltage-Nom Sampling Rate Conversion Rate Integral Nonlinearity (INL) Number of D/A Converters Differential Nonlinearity Converter Type Linearity Error-Max (EL) Settling Time Architecture Number of DAC Channels Reference Type Data Interface Input Bit Code Input Format Analog Output Voltage-Max Analog Output Voltage-Min Voltage - Supply, Analog Voltage - Supply, Digital INL/DNL (LSB) Settling Time-Max
AD5344BRU AD5344BRU Rochester Electronics, LLC 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube no Obsolete 1 (Unlimited) 24 9.7mm Non-RoHS Compliant 28-TSSOP (0.173, 4.40mm Width) Surface Mount -40°C~105°C CMOS 1.2mm 4 e0 TIN LEAD DUAL GULL WING 240 3V 30 24 Voltage - Buffered YES 0.65mm COMMERCIAL 12 No 4 D/A CONVERTER 0.3906% 10μs String DAC External Parallel BINARY 2.999V 0.001V 2.5V~5.5V 2.5V~5.5V ±2, ±0.2
PCM1723E/2KG4 PCM1723E/2KG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 yes 1 (Unlimited) 24 85°C -25°C 5V RoHS Compliant Contains Lead No 24 WITH PROGRAMMABLE PLL SSOP Serial 5.3mm 219.992299mg 1 20mA e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 5V 24 Voltage OTHER YES 0.65mm 94 dB Other Converters 5V 3 B 24 2 96 ksps D/A CONVERTER 3.1V
LTC2632CTS8-LX10#TRPBF LTC2632CTS8-LX10#TRPBF Linear Technology/Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 14 Weeks Tape & Reel (TR) 2011 Active 1 (Unlimited) ROHS3 Compliant SOT-23-8 Thin, TSOT-23-8 Surface Mount 0°C~70°C LTC2632 8 Voltage - Buffered 10 No 2 3.9μs (Typ) External, Internal SPI 2.7V~5.5V 2.7V~5.5V ±0.2, ±0.5 (Max)
AD5726YRWZ-REEL AD5726YRWZ-REEL Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 1 month ago) Tape & Reel (TR) iCMOS® no Active 1 (Unlimited) 16 EAR99 10.3mm ROHS3 Compliant Contains Lead Tin 16 16-SOIC (0.295, 7.50mm Width) SPI, Serial 15.75V 4.75V 7.5mm Surface Mount -40°C~125°C 2.65mm 4 12V e3 GULL WING 260 5V 30 AD5726 16 Voltage - Buffered YES 1.27mm Other Converters +-5/+-15V 240mW Bipolar, Unipolar 2.3 V/μs 0V 240mW 15.75V 4.75V 20V 1.5 B 12 2mA No Dual 0V 4 -5V 111 ksps 111 ksps 1 LSB D/A CONVERTER 13μs (Typ) R-2R External SPI, DSP BINARY ±5V~15V 5V~15V ±1 (Max), ±1 (Max)
DAC7714U DAC7714U Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 1 week ago) Tube yes Active 3 (168 Hours) 16 EAR99 15V 10.3mm ROHS3 Compliant Lead Free Gold 16 16-SOIC (0.295, 7.50mm Width) 15.75V No SVHC 14.25V 2.65mm 7.5mm 2.35mm Surface Mount 420.395078mg -40°C~85°C 1 6mA e4 GULL WING 260 15V DAC7714 16 Voltage - Buffered YES 1.27mm Other Converters Bipolar, Unipolar 15.75V 14.25V 45mW 15V 1.5 B 12 No Dual 4 -15V 89 ksps 89 ksps 2 LSB 1 LSB D/A CONVERTER 10μs R-2R External SPI BINARY SERIAL 10V -10V ±14.25V~15.75V 14.25V~15.75V ±2 (Max), ±1 (Max)
DAC7664YBTG4 DAC7664YBTG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 yes 3 (168 Hours) 64 85°C -40°C 10mm RoHS Compliant Contains Lead No 64 LQFP Parallel 5.25V 4.75V 10mm 342.689036mg 1.6mm 1 4mA e4 Nickel/Palladium/Gold (Ni/Pd/Au) QUAD GULL WING 260 5V 64 Voltage INDUSTRIAL YES 0.5mm Other Converters 5V 18mW 18mW 2 B 16 Dual 4 -5V 100 ksps 100 ksps 3 LSB 2 LSB D/A CONVERTER 12 μs BINARY 2.5V -2.5V
MAX543BC/D MAX543BC/D Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 1996 no Obsolete 1 (Unlimited) 9 3A001.A.2.C ROHS3 Compliant not_compliant CMOS 8542.39.00.01 1 e0 Tin/Lead (Sn/Pb) UPPER NO LEAD 240 5V NOT SPECIFIED 9 COMMERCIAL YES R-XUUC-N9 70°C Other Converters Not Qualified 5/15V 12 0.5mA D/A CONVERTER 0.0244% 0.25 µs BINARY, OFFSET BINARY, 2'S COMPLEMENT BINARY SERIAL 1μs
LTC2635HUD-LMO10#PBF LTC2635HUD-LMO10#PBF Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download PRODUCTION (Last Updated: 2 weeks ago) Surface Mount 125°C -40°C RoHS Compliant 16 QFN 2-Wire, I2C, Serial 5.5V No SVHC 2.7V 700μA Voltage 4 1.25 B 10 Single 4 400 ksps 1 LSB 4.1 μs
MAX5152AEEE+ MAX5152AEEE+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 1997 yes Obsolete 1 (Unlimited) 16 EAR99 4.89mm ROHS3 Compliant 3.9mm CMOS 1.75mm 8542.39.00.01 2 e3 TIN DUAL GULL WING 260 5V NOT SPECIFIED 16 INDUSTRIAL YES 0.635mm R-PDSO-G16 85°C -40°C Other Converters Not Qualified 5V 13 0.65mA D/A CONVERTER 0.0061% 16 µs BINARY SERIAL
DAC715PKG4 DAC715PKG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube yes Obsolete 1 (Unlimited) 28 35.69mm ROHS3 Compliant Lead Free Gold 28 28-DIP (0.300, 7.62mm) 7.62mm Through Hole 2.063789g 0°C~70°C 5.08mm 1 22mA e4 15V DAC715 28 Voltage - Buffered NO 2.54mm Other Converters 600mW Unipolar 16.5V 11.4V 10mW 15V 2 B 16 No Dual 1 -15V 100 ksps 100 ksps 2 LSB 2 LSB D/A CONVERTER 10μs R-2R Internal Parallel 2'S COMPLEMENT BINARY ±11.4V~16.5V ±2 (Max), ±2 (Max)
AD5669RACPZ-2-RL7 AD5669RACPZ-2-RL7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 months ago) Tape & Reel (TR) denseDAC no Active 3 (168 Hours) 16 EAR99 4mm ROHS3 Compliant Contains Lead Tin 16-WQFN Exposed Pad, CSP 2-Wire, I2C, Serial 5.5V 2.7V 4mm Surface Mount -40°C~105°C CMOS 1 5.5V e3 QUAD 260 3V 30 AD5669 16 Voltage - Buffered YES 0.65mm Other Converters 3/5V Unipolar 1.5 V/μs 750mV 13.8mW 5.5V 2 B 16 2.5mA No Single 0V 8 166 ksps 166 ksps 32 LSB D/A CONVERTER 7μs String DAC External, Internal I2C BINARY 5V ±8, ±1 (Max)
MAX530ACWG+T MAX530ACWG+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount 1995 yes 1 (Unlimited) 24 70°C 0°C RoHS Compliant 24 SOIC Parallel 5.5V 4.5V 7.5mm 2.65mm 1 e3 Matte Tin (Sn) GULL WING 260 5V NOT SPECIFIED 24 Voltage COMMERCIAL Other Converters Not Qualified 5/+-5V 1.5 B 12 0.4mA Dual 1 -5V 0.5 LSB D/A CONVERTER 25 μs BINARY, OFFSET BINARY
AD5392BST-5-REEL AD5392BST-5-REEL Analog Devices, Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount Tape and Reel 3 (168 Hours) 52 EAR99 85°C -40°C 5V 10mm Non-RoHS Compliant Contains Lead 52 LQFP I2C, SPI, Serial 5.5V not_compliant 4.5V 10mm CMOS 1.6mm 1 e0 QUAD GULL WING 240 5V 30 52 Voltage INDUSTRIAL 0.65mm 8 Other Converters Not Qualified 1.75 B 14 125 ksps 3 LSB D/A CONVERTER 10 μs BINARY
MX7545LN+ MX7545LN+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 10 Weeks PRODUCTION (Last Updated: 1 month ago) Through Hole Tube 2003 yes Active 1 (Unlimited) 20 EAR99 ROHS3 Compliant Lead Free 20-DIP (0.300, 7.62mm) 15V 5V 7.62mm Through Hole 0°C~70°C CMOS 4.572mm 1 e3 Matte Tin (Sn) DUAL 260 5V MX7545 20 Current - Unbuffered 2.54mm R-PDIP-T20 Other Converters 450mW 1.5 B 12 2mA No Single 0.5 LSB D/A CONVERTER 2μs R-2R 1 External Parallel BINARY, OFFSET BINARY, 2'S COMPLEMENT BINARY 5V~15V 5V~15V ±0.5 (Max), ±1 (Max)
AD7835APZ-REEL AD7835APZ-REEL Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) yes Obsolete 3 (168 Hours) 44 EAR99 16.585mm ROHS3 Compliant Lead Free 44-LCC (J-Lead) 16.585mm Surface Mount -40°C~85°C BICMOS 4 e3 Matte Tin (Sn) QUAD J BEND 260 15V 40 AD7835 44 Voltage - Buffered YES 1.27mm Other Converters 5+-15V 14 No -15V 4 D/A CONVERTER 0.0122% 10μs (Typ) R-2R External Parallel BINARY 8.192V -8.192V ±11.4V~15.75V 5V ±2 (Max), ±0.9 (Max)
AD5620CRM-3 AD5620CRM-3 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube nanoDAC® no Obsolete 1 (Unlimited) 8 EAR99 5V 3mm Non-RoHS Compliant Contains Lead Lead, Tin 8 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) SPI, Serial 5.5V 4.5V 3mm Surface Mount -40°C~105°C CMOS 1 2.5V e0 Tin/Lead (Sn/Pb) DUAL GULL WING 240 5V 30 AD5620 8 Voltage - Buffered YES 0.65mm Other Converters 5mW Unipolar 1.5 V/μs 1.25V 5.5mW 5V 1.5 B 12 No Single 0V 1 125 ksps 125 ksps 1 LSB D/A CONVERTER 0.0244% 10μs String DAC Internal SPI, DSP BINARY ±1 (Max), ±0.25 (Max)
LTC1663-2CS5#TR LTC1663-2CS5#TR Analog Devices, Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount 70°C 0°C RoHS Compliant Contains Lead SOT-23-5 Serial 10 Single 1 30 μs
ISL5761/2IBZ ISL5761/2IBZ Renesas Electronics America Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube Obsolete 3 (168 Hours) 28 ROHS3 Compliant 28-SOIC (0.295, 7.50mm Width) 7.5mm Surface Mount -40°C~85°C CMOS 2.65mm 1 e3 Matte Tin (Sn) DUAL GULL WING 3.3V ISL5761 Current - Unbuffered YES R-PDSO-G28 10 Yes 1 D/A CONVERTER Current Source External, Internal Parallel BINARY 2.7V~3.6V 2.7V~3.6V ±0.1, ±0.1
AD5641AKSZ-500RL7 AD5641AKSZ-500RL7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 months ago) Tape & Reel (TR) nanoDAC® no Active 1 (Unlimited) 6 SMD/SMT EAR99 2.2mm ROHS3 Compliant Contains Lead Gold 6 6-TSSOP, SC-88, SOT-363 SPI, Serial 5.5V No SVHC 2.7V 1mm 1.35mm Surface Mount -40°C~125°C CMOS 1 75μA 5.5V e4 DUAL GULL WING 260 3V 40 AD5641 6 Voltage - Buffered YES Other Converters 3/5V 550μW Bipolar, Unipolar 0.5 V/μs 2.7V 5.5mW 5.5V 1.75 B 14 No 2.7V 1 1.7 Msps 1.7 Msps 16 LSB D/A CONVERTER 0.0977% 10μs String DAC Supply SPI, DSP BINARY 2.7V~5.5V 2.7V~5.5V ±16 (Max), ±1 (Max)
LTC2657BIFE-H16 LTC2657BIFE-H16 Linear Technology/Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tube Obsolete 1 (Unlimited) 20 EAR99 6.5mm Non-RoHS Compliant 20-TSSOP (0.173, 4.40mm Width) Exposed Pad 4.4mm Surface Mount -40°C~85°C CMOS 1.2mm 1 e3 Matte Tin (Sn) DUAL GULL WING 260 5V 30 LTC2657 20 Voltage - Buffered YES 0.65mm R-PDSO-G20 Other Converters 3/5V 16 4.25mA No 8 D/A CONVERTER 0.0061% 9.1μs (Typ) External, Internal I2C BINARY SERIAL 4.096V 5V ±2, ±0.3
DAC1654D1G25NAG-C1 DAC1654D1G25NAG-C1 Integrated Device Technology (IDT) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 RoHS Compliant
LTC1663CMS8#TR LTC1663CMS8#TR Analog Devices, Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Surface Mount 70°C 0°C RoHS Compliant Contains Lead 8 MSOP Serial 10 Single 1 30 μs
LTC2634CUD-LZ8#PBF LTC2634CUD-LZ8#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 14 Weeks PRODUCTION (Last Updated: 1 week ago) Surface Mount Tube 2005 Active 1 (Unlimited) ROHS3 Compliant 16 16-WFQFN Exposed Pad SPI, Serial 5.5V 2.7V Surface Mount 0°C~70°C LTC2634 16 Voltage - Buffered 1.8mW 1 B 8 No Single 4 0.5 LSB 3.3μs (Typ) External, Internal SPI 2.7V~5.5V 2.7V~5.5V ±0.05, ±0.5 (Max)
LTC2633AHTS8-LX12 LTC2633AHTS8-LX12 Linear Technology/Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tube Obsolete 1 (Unlimited) Non-RoHS Compliant SOT-23-8 Thin, TSOT-23-8 Surface Mount -40°C~125°C LTC2633 8 Voltage - Buffered 12 No 2 4.5μs (Typ) External, Internal I2C 2.7V~5.5V 2.7V~5.5V ±0.5, ±1 (Max)
DAC081S101CIMMX DAC081S101CIMMX Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) no Obsolete 1 (Unlimited) 8 EAR99 3mm Non-RoHS Compliant Contains Lead Lead, Tin 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) SPI, Serial 5.5V 2.7V 3mm Surface Mount -40°C~105°C CMOS 1 e0 Tin/Lead (Sn/Pb) DUAL GULL WING 260 3V DAC081S101 8 Voltage - Buffered 0.65mm Other Converters 3/5V Unipolar 1 B 8 No Single 1 0.75 LSB D/A CONVERTER 0.293% 5μs String DAC Supply SPI, DSP BINARY 2.7V~5.5V 2.7V~5.5V +0.16/-0.12, +0.04/-0.02
DAC7625P DAC7625P Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tube yes Obsolete 1 (Unlimited) 28 5V ROHS3 Compliant Lead Free Gold 28 28-DIP (0.600, 15.24mm) 5.25V No SVHC 4.75V Through Hole -40°C~85°C CMOS 6.35mm 1 e4 5V DAC7625 28 Voltage - Buffered NO Other Converters 20mW Bipolar, Unipolar 5.25V 4.75V 15mW 5V 1.5 B 12 2.1mA No Dual 4 -5V 100 ksps 100 ksps 2 LSB 1 LSB D/A CONVERTER 10μs R-2R External Parallel BINARY ±5V ±2 (Max), ±1 (Max)
LTC2634CMSE-LMI10#PBF LTC2634CMSE-LMI10#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 14 Weeks PRODUCTION (Last Updated: 1 week ago) Surface Mount Tube 2010 Active 1 (Unlimited) ROHS3 Compliant Lead Free 10-TFSOP, 10-MSOP (0.118, 3.00mm Width) Exposed Pad SPI, Serial 5.5V 2.7V Surface Mount 0°C~70°C LTC2634 10 Voltage - Buffered 1.8mW 1.25 B 10 No Single 4 1 LSB 3.8μs (Typ) External, Internal SPI 2.7V~5.5V 2.7V~5.5V ±0.2, ±0.5 (Max)
MCP47FEB21A2-E/ST MCP47FEB21A2-E/ST Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 2016 Active 1 (Unlimited) 8 4.4mm ROHS3 Compliant 8 8-TSSOP (0.173, 4.40mm Width) 2-Wire, I2C, Serial 5.5V 1.8V 3mm Surface Mount -40°C~125°C 1 e3 Matte Tin (Sn) DUAL GULL WING 260 40 MCP47FEB21 Voltage - Buffered 0.65mm 1.5 B 12 No 6 LSB 1 D/A CONVERTER 6μs (Typ) R-2R External, Internal, Supply I2C BINARY 5.46V 2.7V~5.5V 2.7V~5.5V ±1.5, ±0.2
AD5628ARUZ-2REEL7 AD5628ARUZ-2REEL7 Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 2 weeks ago) Tape & Reel (TR) denseDAC no Active 1 (Unlimited) 16 EAR99 5mm ROHS3 Compliant Contains Lead Tin 16 16-TSSOP (0.173, 4.40mm Width) SPI, Serial 5.5V 2.7V 4.4mm Surface Mount -40°C~105°C CMOS 1.2mm 1 5.5V e3 DUAL GULL WING 260 5V 30 AD5628 16 Voltage - Buffered YES 0.65mm Other Converters 12.5mW Unipolar 1.5 V/μs 2.7V 12.4mW 5V 1.5 B 12 2.5mA No Single 0V 95 ksps 95 ksps 4 LSB D/A CONVERTER 0.0977% 7μs String DAC 8 External, Internal SPI, DSP BINARY 2.7V~5.5V 2.7V~5.5V ±0.5, ±0.25 (Max)
AD9744AR AD9744AR Rochester Electronics, LLC 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube TxDAC® no Obsolete 1 (Unlimited) 28 17.9mm Non-RoHS Compliant 28-SOIC (0.295, 7.50mm Width) 7.5mm Surface Mount CMOS 2.65mm 1 e0 TIN LEAD DUAL GULL WING 240 3.3V 30 28 INDUSTRIAL YES 1.27mm R-PDSO-G28 85°C -40°C COMMERCIAL 14 D/A CONVERTER 0.0305% 0.011 µs BINARY, 2'S COMPLEMENT BINARY PARALLEL, WORD 1.25V -1V
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