Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

DC to DC converter

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 Max Supply Voltage REACH SVHC Reach Compliance Code Frequency Height Width Thickness Mounting Type Weight Operating Temperature Technology Operating Supply Current Max Supply Current Height Seated (Max) HTS Code Number of Functions Max Frequency Nominal Input Voltage 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 Operating Temperature (Max) Operating Temperature (Min) Subcategory Qualification Status Output Voltage Output Current-Max Number of Outputs Output Current Voltage - Output Output Power Max Output Current Input Voltage-Nom Analog IC - Other Type Output Voltage-Max Halogen Free Current - Output Min Input Voltage Supplier Device Package Max Output Voltage Quiescent Current Rise Time Fall Time (Typ) Frequency (Max) Output Configuration Control Mode Input Voltage (Min) Input Voltage (Max) Function Min Output Voltage Control Technique Switcher Configuration Switching Frequency-Max Topology Max Duty Cycle Voltage - Supply (Vcc/Vdd) Control Features Frequency - Switching Duty Cycle Synchronous Rectifier Output Voltage-Min Number of Output Phases Serial Interfaces Output Phases Duty Cycle (Max) Clock Sync
MIC2169BYMM-TR MIC2169BYMM-TR Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2009 Active 1 (Unlimited) 85°C -40°C ROHS3 Compliant Lead Free 10-TFSOP, 10-MSOP (0.118, 3.00mm Width) Surface Mount -40°C~85°C TA 550kHz MIC2169 Transistor Driver 1 10-MSOP Positive Step-Down Buck 92 % 3V~14.5V Current Limit 500kHz Yes 1 1 92% No
MAX16930AGLR/VY+ MAX16930AGLR/VY+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 12 Weeks Tube Automotive, AEC-Q100 Obsolete 1 (Unlimited) 40 EAR99 6mm ROHS3 Compliant 40-VFQFN Exposed Pad 6mm Surface Mount -40°C~125°C TJ BICMOS 0.9mm QUAD NO LEAD MAX16930 Transistor Driver YES 0.5mm S-XQCC-N40 5V 3 14V DUAL SWITCHING CONTROLLER Positive CURRENT-MODE Step-Up, Step-Down PULSE WIDTH MODULATION BUCK-BOOST Buck, Boost 3.5V~42V Enable, Frequency Control, Power Good 1MHz~2.2MHz Yes 2 95%
ISL6248ACRZ-T ISL6248ACRZ-T Intersil (Renesas Electronics America) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) Active 6mm RoHS Compliant Lead Free No 40 QFN 880μm 6mm
NCV494BDR2G NCV494BDR2G ON Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 10 Weeks ACTIVE (Last Updated: 2 days ago) Surface Mount Tape & Reel (TR) 2005 SWITCHMODE™ yes Active 1 (Unlimited) 16 EAR99 15V 10mm ROHS3 Compliant Lead Free 16 16-SOIC (0.154, 3.90mm Width) 40kHz 1.5mm 4mm Surface Mount -40°C~125°C TJ BIPOLAR 15mA e3 Tin (Sn) DUAL GULL WING 260 40 NCV494B Transistor Driver Switching Regulator or Controllers 1 500mA 15V SWITCHING CONTROLLER Halogen Free 100ns 40 ns Positive VOLTAGE-MODE 7V 40V Step-Down, Step-Up/Step-Down PULSE WIDTH MODULATION Buck, Push-Pull 48 % 7V~40V Dead Time Control, Frequency Control Yes 48% No
LTC3892EUH#TRPBF LTC3892EUH#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 26 Weeks Tape & Reel (TR) 2015 Active 1 (Unlimited) ROHS3 Compliant 32-WFQFN Exposed Pad Surface Mount -40°C~125°C TJ LTC3892 Transistor Driver 2 Positive Step-Down Buck 4.5V~60V Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking 105kHz~835kHz 350kHz~535kHz Yes 99% No
MAX17499AAUB+T MAX17499AAUB+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Surface Mount Tape & Reel (TR) 2011 Active 1 (Unlimited) EAR99 9.5V ROHS3 Compliant 10 10-TFSOP, 10-MSOP (0.118, 3.00mm Width) Surface Mount -40°C~125°C TJ 50μA 625kHz MAX17499 Transistor Driver 1.5V 1 50μA SWITCHING CONTROLLER Positive, Isolation Capable Step-Up, Step-Up/Step-Down Boost, SEPIC 50 % 9.5V~24V Enable 50kHz~2.5MHz No
MAX5038AEAI15 MAX5038AEAI15 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube 2016 no Obsolete 1 (Unlimited) 28 EAR99 28V ROHS3 Compliant 28 28-SSOP (0.209, 5.30mm Width) Surface Mount -40°C~85°C TA BICMOS 1.99mm e0 Tin/Lead (Sn85Pb15) DUAL GULL WING 245 MAX5038 Transistor Driver 0.65mm Switching Regulator or Controllers 1.5V 2 4A 5V SWITCHING CONTROLLER Positive CURRENT-MODE 4.75V 5.5V Step-Down PULSE WIDTH MODULATION PHASE-SHIFT Buck 4.75V~28V Enable 250kHz 500kHz Yes No
MAX772ESA+ MAX772ESA+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 1997 yes Not For New Designs 1 (Unlimited) 8 EAR99 4.9mm ROHS3 Compliant Lead Free 8-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~85°C TA BICMOS 300kHz e3 Matte Tin (Sn) DUAL GULL WING 260 MAX772 Transistor Driver R-PDSO-G8 Switching Regulator or Controllers 3V 1 1A 15W 5V SWITCHING CONTROLLER Positive CURRENT-MODE 2V Step-Up PULSE FREQUENCY MODULATION Boost 3V~16.5V Enable 90 % No
LTC7800IUDC#PBF LTC7800IUDC#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tube 2013 Active 1 (Unlimited) 20 4mm RoHS Compliant 20-WFQFN Exposed Pad compliant 3mm Surface Mount -40°C~125°C TJ CMOS 0.8mm e3 Matte Tin (Sn) QUAD 260 30 LTC7800 Transistor Driver YES 0.5mm R-PQCC-N20 1 12V SWITCHING CONTROLLER 24V Positive CURRENT-MODE 4V 60V Step-Down PULSE WIDTH MODULATION Buck 4V~60V Current Limit, Power Good, Soft Start, Tracking 320kHz~2.25MHz No 0.8V 98%
LTC3887IUJ#PBF LTC3887IUJ#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2015 PolyPhase® Active 1 (Unlimited) ROHS3 Compliant 40-WFQFN Exposed Pad Surface Mount -40°C~125°C TJ LTC3887 Transistor Driver 2 Positive Step-Down Buck 4.5V~24V Enable, Frequency Control, Phase Control 250kHz~1MHz Yes I2C, PMBus
S-8352D20MC-K8FT2G S-8352D20MC-K8FT2G ABLIC U.S.A. Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 12 Weeks Tape & Reel (TR) yes Not For New Designs 1 (Unlimited) 5 EAR99 2.9mm RoHS Compliant SC-74A, SOT-753 Surface Mount -40°C~85°C TA CMOS DUAL GULL WING 260 10 Transistor Driver YES 0.95mm R-PDSO-G5 2V 0.3A 1 SWITCHING CONTROLLER Positive Step-Up PULSE FREQUENCY MODULATION SINGLE Boost 0.9V~10V 100kHz No 75%
TPS53128RGET TPS53128RGET Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 2 days ago) Tape & Reel (TR) D-CAP2™ yes Active 2 (1 Year) 24 EAR99 24V 4mm ROHS3 Compliant Lead Free 24 24-VFQFN Exposed Pad 1mm 4mm 880μm Surface Mount -40°C~85°C TA 350kHz 24V e4 Nickel/Palladium/Gold (Ni/Pd/Au) QUAD 260 TPS53128 Transistor Driver YES 0.5mm 5.5V 2 15A 5.5V DUAL SWITCHING CONTROLLER 4.5V 5.5V 450μA Positive Step-Down 760mV PULSE WIDTH MODULATION PHASE-SHIFT Buck 4.5V~24V Current Limit, Enable, Soft Start 89 % Yes 1 No
LTC3897IUHF#PBF LTC3897IUHF#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 2 weeks ago) Tube 2011 Active 1 (Unlimited) ROHS3 Compliant 38 38-WFQFN Exposed Pad Surface Mount -40°C~125°C TJ LTC3897 Transistor Driver 2 Positive Step-Up Boost 4.5V~65V Current Limit, Frequency Control, Overcurrent, Ramping 75kHz~850kHz Yes
LTC3859ALIFE#TRPBF LTC3859ALIFE#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Tape & Reel (TR) 2013 Active 1 (Unlimited) 38 EAR99 9.7mm ROHS3 Compliant 38-TFSOP (0.173, 4.40mm Width) Exposed Pad 4.4mm Surface Mount -40°C~125°C TJ CMOS e3 Matte Tin (Sn) DUAL GULL WING LTC3859 Transistor Driver YES 0.5mm Switching Regulator or Controllers 3 12V SWITCHING CONTROLLER Positive CURRENT-MODE 4.5V Step-Down, Step-Up/Step-Down PULSE WIDTH MODULATION Buck, Buck-Boost, SEPIC 4.5V~38V Enable, Frequency Control, Power Good, Soft Start, Tracking 115kHz~835kHz 350kHz~535kHz Yes 2 99%, 100% No
TL494CPWG4 TL494CPWG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 1 week ago) Tube yes Active 1 (Unlimited) 16 EAR99 5mm ROHS3 Compliant Lead Free 16 16-TSSOP (0.173, 4.40mm Width) 300kHz 1.2mm 4.4mm 1mm Surface Mount 61.887009mg 0°C~70°C TA BIPOLAR e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 15V TL494 Transistor Driver YES Switching Regulator or Controllers 40V 2 200mA 15V SWITCHING CONTROLLER 100ns 40 ns Positive VOLTAGE-MODE 7V Step-Up, Step-Down, Step-Up/Step-Down PULSE WIDTH MODULATION Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull 45 % 7V~40V Dead Time Control, Frequency Control 1kHz~300kHz No 1
FAN6520BIMX FAN6520BIMX Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) yes Obsolete 1 (Unlimited) 8 4.9mm ROHS3 Compliant 8-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~85°C TA e3 MATTE TIN DUAL GULL WING 260 Transistor Driver YES R-PDSO-G8 1 5V SWITCHING REGULATOR Positive VOLTAGE-MODE 4.5V 5.5V Step-Down PULSE WIDTH MODULATION PUSH-PULL Buck 4.5V~5.5V Enable 300kHz Yes 100% No
UCC3580D-3G4 UCC3580D-3G4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount yes 1 16 EAR99 70°C 0°C 9.9mm RoHS Compliant Lead Free No 16 SOIC 16V 1MHz 1.58mm 3.91mm 141.690917mg BICMOS 1 e4 Nickel/Palladium/Gold (Ni/Pd/Au) DUAL GULL WING 260 16 COMMERCIAL Switching Regulator or Controllers 2 400mV 12V SWITCHING CONTROLLER 100mA 40ns 20 ns 1MHz VOLTAGE-MODE 10V 14V PULSE WIDTH MODULATION PUSH-PULL Flyback 69 % 430kHz 69 %
MAX1954AEUB+TG05 MAX1954AEUB+TG05 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download no Obsolete 1 (Unlimited) EAR99 Non-RoHS Compliant compliant 8542.39.00.01 NOT SPECIFIED NOT SPECIFIED SWITCHING CONTROLLER
TPS53129RGER TPS53129RGER Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 12 Weeks ACTIVE (Last Updated: 2 days ago) Tape & Reel (TR) D-CAP2™ yes Active 2 (1 Year) 24 EAR99 24V 4mm ROHS3 Compliant Lead Free 24 24-VFQFN Exposed Pad 1mm 4mm 880μm Surface Mount -40°C~85°C TA 700kHz 24V e4 Nickel/Palladium/Gold (Ni/Pd/Au) QUAD 260 TPS53129 Transistor Driver YES 0.5mm 5.5V 2 15A 15A 5.5V DUAL SWITCHING CONTROLLER 4.5V 5.5V 450μA Positive Step-Down 760mV PULSE WIDTH MODULATION PHASE-SHIFT Buck 4.5V~24V Current Limit, Enable, Soft Start 89 % Yes 1 No
LTC1159CG-5#PBF LTC1159CG-5#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks PRODUCTION (Last Updated: 2 weeks ago) Surface Mount Tube 2001 Active 1 (Unlimited) 20 EAR99 7.2mm ROHS3 Compliant Lead Free 20 20-SSOP (0.209, 5.30mm Width) 5.3mm Surface Mount 0°C~70°C TA CMOS 2mm 250kHz e3 Matte Tin (Sn) DUAL GULL WING 260 30 LTC1159 Transistor Driver 0.65mm Switching Regulator or Controllers 5.05V 1 50mA 12V SWITCHING CONTROLLER Positive or Negative CURRENT-MODE 4V 40V Step-Down CONSTANT OFF TIME PUSH-PULL Buck 4V~40V Current Limit, Enable Up to 250kHz Yes 100% No
MAX1627ESA+TG035 MAX1627ESA+TG035 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Obsolete 1 (Unlimited)
MAX17101ETJ+ MAX17101ETJ+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube 2008 yes Obsolete 1 (Unlimited) 32 SMD/SMT EAR99 5mm ROHS3 Compliant 32 32-WFQFN Exposed Pad No SVHC 27kHz 5mm Surface Mount -40°C~85°C TA BICMOS 0.8mm 24V QUAD MAX17101 Transistor Driver YES 0.5mm Switching Regulator or Controllers 5.5V 2 10A 12V DUAL SWITCHING CONTROLLER 5.5V Positive CURRENT-MODE Step-Down 700mV PULSE WIDTH MODULATION PUSH-PULL Buck 6V~24V Current Limit, Enable, On Time Control, Power Good Yes 1 No
RN5RK402A-TR-FE RN5RK402A-TR-FE Ricoh Electronic Devices Company 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 9 Weeks Tape & Reel (TR) yes Active 1 (Unlimited) 5 EAR99 2.9mm RoHS Compliant 1.6mm CMOS 1.3mm 8542.39.00.01 1 DUAL GULL WING NOT SPECIFIED NOT SPECIFIED 5 INDUSTRIAL YES 0.95mm R-PDSO-G5 85°C -40°C 4V 2V SWITCHING REGULATOR 8V BUCK 120kHz
ISL6520IB-T ISL6520IB-T Intersil (Renesas Electronics America) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 2001 Discontinued 1 8 EAR99 85°C -40°C 4.9mm RoHS Compliant Contains Lead SOIC 3.9mm 1 e0 Tin/Lead (Sn/Pb) DUAL GULL WING 240 NOT SPECIFIED 8 INDUSTRIAL YES R-PDSO-G8 Switching Regulator or Controllers Not Qualified 1 5V SWITCHING CONTROLLER 340kHz VOLTAGE-MODE 4.5V 5.5V PULSE WIDTH MODULATION PUSH-PULL 100 %
ISL6445IAZ-TK ISL6445IAZ-TK Renesas Electronics America 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Cut Tape (CT) Obsolete 2 (1 Year) 24 EAR99 8.645mm ROHS3 Compliant O/P VOLTAGE IS FROM 0.8V 24-SSOP (0.154, 3.90mm Width) 3.895mm Surface Mount -40°C~85°C TA 1.75mm e3 Matte Tin (Sn) DUAL GULL WING ISL6445 Transistor Driver YES 0.635mm 2 12V DUAL SWITCHING CONTROLLER Positive CURRENT-MODE 5.6V Step-Down PULSE WIDTH MODULATION PHASE-SHIFT Buck 5.6V~24V Enable, Phase Control, Power Good, Soft Start 1.4MHz Yes 73% No
S-8520F60MC-BOTT2G S-8520F60MC-BOTT2G ABLIC U.S.A. Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) yes Not For New Designs 1 (Unlimited) 5 EAR99 2.9mm RoHS Compliant SC-74A, SOT-753 Surface Mount -40°C~85°C TA CMOS DUAL GULL WING 260 10 Transistor Driver YES 0.95mm R-PDSO-G5 6V 0.05A 1 SWITCHING CONTROLLER Positive 2.5V Step-Down PULSE WIDTH MODULATION SINGLE Buck 2.5V~16V Enable 300kHz No 100%
UC3526AQ UC3526AQ Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube yes Discontinued 2 (1 Year) 20 EAR99 8.965mm ROHS3 Compliant Contains Lead No 20 20-LCC (J-Lead) 450kHz 8.965mm Surface Mount 0°C~70°C TA CMOS 4.57mm 35V e3 Matte Tin (Sn) QUAD J BEND 260 UC3526 Transistor Driver YES Switching Regulator or Controllers 13V 2 100mA 15V SWITCHING CONTROLLER 300ns 100 ns Positive VOLTAGE-MODE Step-Up, Step-Down, Step-Up/Step-Down PULSE WIDTH MODULATION Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull 50 % 7V~35V Enable, Frequency Control, Reset, Soft Start 1Hz~600kHz Yes 1 49%
ISL8102CRZ-T ISL8102CRZ-T Renesas Electronics America 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Cut Tape (CT) Obsolete 3 (168 Hours) 32 5mm ROHS3 Compliant 32-VFQFN Exposed Pad 5mm Surface Mount 0°C~70°C TA 1mm e3 Matte Tin (Sn) QUAD ISL8102 Transistor Driver YES 0.5mm 2 5V SWITCHING CONTROLLER Positive VOLTAGE-MODE 4.75V Step-Down PULSE WIDTH MODULATION Buck 4.75V~12.6V Enable, Frequency Control, Phase Control, Power Good Up to 1.5MHz Yes 66.6% No
ZL2005PALRFT ZL2005PALRFT Intersil (Renesas Electronics America) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 9 Weeks Cut Tape 2003 2 36 EAR99 85°C -40°C 6mm RoHS Compliant No 36 OUTPUT VOLTAGE IS ADJUSTABLE FROM 0.54 TO 5.5V QFN 6mm 1 e3 Matte Tin (Sn) - annealed QUAD 260 30 36 INDUSTRIAL YES 0.5mm Switching Regulator or Controllers 1 12V SWITCHING CONTROLLER 16mA 1.4MHz VOLTAGE-MODE 3V PULSE WIDTH MODULATION PUSH-PULL 95 %
LM3477MMX/NOPB LM3477MMX/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 3 days ago) Surface Mount Tape & Reel (TR) yes Active 1 (Unlimited) 8 EAR99 35V 3mm ROHS3 Compliant Lead Free Tin 8 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) 1.07mm 3mm 970μm Surface Mount -40°C~125°C TJ 575kHz e3 DUAL GULL WING 260 LM3477 Transistor Driver 0.65mm 1.265V 6A 12V SWITCHING CONTROLLER 2mA Positive CURRENT-MODE 2.97V Step-Down PULSE WIDTH MODULATION SINGLE Buck, Buck-Boost 93 % 2.97V~35V Enable 500kHz No 1
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