Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

RF Transceiver ICs

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 Depth Operating Supply Voltage Length RoHS Status Lead Free Contact Plating Radiation Hardening Number of Pins Package / Case Interface REACH SVHC Reach Compliance Code Number of Receivers Frequency Height Width Thickness Mounting Type Weight Operating Temperature Technology Max Supply Current Bandwidth Height Seated (Max) HTS Code Number of Functions 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 Temperature Grade Sensitivity Surface Mount Terminal Pitch JESD-30 Code Operating Temperature (Max) Operating Temperature (Min) Number of Channels Subcategory Qualification Status Power Supplies Watchdog Timer Supplier Device Package Core Architecture Speed Power - Output Memory Size Memory Type Number of GPIO RAM Size Number of I/O Number of UART Channels Supply Current-Max Telecom IC Type Voltage - Supply Protocol Data Bus Width Number of Programmable I/O Number of Timers/Counters Data Rate (Max) Product Category Bit Size Has ADC DMA Channels PWM Channels DAC Channels Sensitivity (dBm) RF Family/Standard Modulation Technique Current - Receiving Current - Transmitting ROM (words) RAM (bytes) Number of ADC Channels Serial Interfaces Modulation GPIO
MC13226VR2 MC13226VR2 NXP Semiconductors 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2006 Obsolete 3 (168 Hours) 99 9.5mm ROHS3 Compliant 145-TFLGA 2.4GHz 9.5mm Surface Mount -40°C~105°C CMOS 1.2mm 8542.31.00.01 TxRx + MCU BOTTOM BUTT NOT SPECIFIED 2.7V NOT SPECIFIED -100dBm YES S-XBGA-B99 4dBm 128kB Flash 80kB ROM 96kB SRAM 2V~3.6V Zigbee® 250kbps 802.15.4 22mA~24mA 29mA I2C, I2S, JTAG, SPI, UART O-QPSK 64
STA2500DTR STA2500DTR STMicroelectronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Surface Mount Tape & Reel (TR) yes Active 3 (168 Hours) 48 2.75V 6mm ROHS3 Compliant No 48 48-LFBGA I2C, SPI, UART 2.4GHz 6mm -40°C~85°C 1.25mm 8542.39.00.01 1 TxRx + MCU e1 Tin/Silver/Copper (Sn/Ag/Cu) BOTTOM BALL 260 2.75V STA2500 48 0.8mm Other Telecom ICs 8dBm 1.65V~2.85V Bluetooth v2.1 +EDR 3Mbps -88 dBm Bluetooth 35.4mA 23mA~35.4mA I2C, JTAG, SPI, UART 8DPSK, DQPSK, GFSK 10
UPC8116GR-E1 UPC8116GR-E1 California Eastern Laboratories 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape and Reel Obsolete RoHS non-compliant 20 Receiver AM/ASK
AD9375BBCZ AD9375BBCZ Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 1 month ago) Tray no Active 3 (168 Hours) 196 12mm ROHS3 Compliant 196 196-LFBGA, CSPBGA 300MHz~6GHz 12mm Surface Mount -40°C~85°C 1.27mm 1 TxRx Only BOTTOM BALL 260 1.3V 30 AD9375 196 YES 0.8mm 7dbm 3.3V Cellular 1A 1.1A SPI
EFR32BG13P632F512IM48-C EFR32BG13P632F512IM48-C Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tray EFR32™ Blue Gecko Not For New Designs 2 (1 Year) Non-RoHS Compliant 48-VFQFN Exposed Pad 2.4GHz Surface Mount -40°C~125°C 8542.39.00.01 TxRx + MCU -126dBm 10dBm 512kB Flash 64kB RAM 1.8V~3.8V Bluetooth v5.0 2Mbps 802.15.4, Bluetooth 8.4mA~9.5mA 8.5mA~35.3mA I2C, UART, USART 2FSK, 4FSK, ASK, BPSK, DBPSK, DSSS, GFSK, GMSK, OOK, O-QPSK 31
CC2530F128RHAR CC2530F128RHAR Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 2 days ago) Surface Mount Tape & Reel (TR) yes Active 3 (168 Hours) 40 6mm ROHS3 Compliant Lead Free Gold No 40 40-VFQFN Exposed Pad 2-Wire, SPI, UART, USART 2.4GHz 1mm 6mm 900μm Surface Mount 78.698276mg -40°C~125°C 1 TxRx + MCU e4 QUAD 260 3V CC2530 40 0.5mm Yes 8051 4.5dBm 128kB Flash 8kB RAM FLASH 8kB 21 1 2V~3.6V Zigbee® 8b 4 250kbps -97 dBm 802.15.4 20.5mA~24.3mA 28.7mA~33.5mA 8 SPI, USART
EFR32MG1P133F256GM48-C0 EFR32MG1P133F256GM48-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2016 Mighty Gecko Active 2 (1 Year) 48 7mm Non-RoHS Compliant 48-VFQFN Exposed Pad 7mm Surface Mount 0.9mm 8542.39.00.01 1 QUAD NO LEAD 3.3V INDUSTRIAL YES 0.5mm S-XQCC-N48 85°C -40°C TELECOM CIRCUIT
EFR32FG1V131F32GM48-C0 EFR32FG1V131F32GM48-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray Flex Gecko yes Active 2 (1 Year) 48 7mm RoHS Compliant 48-VFQFN Exposed Pad compliant 169MHz~915MHz 7mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -94dBm YES 0.5mm S-XQCC-N48 16.5dBm 32kB Flash 8kB RAM 1.85V~3.8V Flex Gecko 1Mbps 802.15.4 8.7mA 8.2mA I2C, I2S, SPI, UART 2FSK, 4FSK, ASK, BPSK, DBPSK, DSSS, GFSK, GMSK, MSK, OOK, O-QPSK 32
CC3200MODR1M2AMOBT CC3200MODR1M2AMOBT Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 12 Weeks ACTIVE (Last Updated: 3 days ago) Tape & Reel (TR) SimpleLink™ Active 4 (72 Hours) 63 3.3V 20.5mm ROHS3 Compliant Contains Lead Gold 63 63-SMD Module I2C, SPI, UART No SVHC 2.4GHz 2.45mm 17.5mm 1.5mm -20°C~70°C CMOS TxRx + MCU UNSPECIFIED NO LEAD 3.3V CC3200 YES 4 17dBm 256kB 25 2 2.3V~3.6V 802.11b/g/n 54Mbps YES NO NO NO -94.7 dBm WiFi 59mA 278mA I2C, SPI, UART
CYWUSB6935-48LTXC CYWUSB6935-48LTXC Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tray WirelessUSB™ Obsolete 3 (168 Hours) ROHS3 Compliant 48-VFQFN Exposed Pad 2.4GHz Surface Mount 0°C~70°C TxRx Only -95dBm 48-QFN (7x7) 0dBm 2.7V~3.6V 62.5kbps General ISM > 1GHZ 57.7mA 69.1mA SPI DSSS, GFSK
CYWUSB6935-48LFXC CYWUSB6935-48LFXC Rochester Electronics 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tube WirelessUSB™ yes Obsolete 3 (168 Hours) 48 7mm ROHS3 Compliant 48-VFQFN Exposed Pad unknown 2.4GHz 7mm Surface Mount 0°C~70°C 1mm 1 TxRx Only e3 MATTE TIN QUAD NO LEAD 260 3V 20 48 -95dBm YES 0.5mm S-XQCC-N48 COMMERCIAL 0dBm 2.7V~3.6V 62.5kbps General ISM > 1GHZ 57.7mA 69.1mA SPI DSSS, GFSK
EFR32FG1P132F256GM48-B0R EFR32FG1P132F256GM48-B0R Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2016 Flex Gecko yes Discontinued 2 (1 Year) 48 7mm RoHS Compliant 48-VFQFN Exposed Pad I2C, UART, USART unknown 2.4GHz 7mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V YES 0.5mm S-XQCC-N48 19.5dBm 256kB Flash 32kB RAM 1.85V~3.8V 2Mbps -99.2 dBm General ISM > 1GHZ 8.7mA 8.8mA~133mA I2C, UART, USART 2FSK, 4FSK, DSSS, GFSK, GMSK, MSK, O-QPSK 31
SI4430-B1-FMR SI4430-B1-FMR Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2000 Not For New Designs 1 (Unlimited) 20 4mm 3V 4mm RoHS Compliant 20 20-VFQFN Exposed Pad 900MHz~960MHz Surface Mount -40°C~85°C 0.9mm 1 TxRx Only QUAD NO LEAD NOT SPECIFIED 3V NOT SPECIFIED 20 YES 0.5mm Other Telecom ICs Not Qualified 13dBm Max 1.8V~3.6V 256kbps -121 dBm General ISM < 1GHz 18.5mA 17mA~30mA SPI FSK, GFSK, OOK 3
EFR32MG1B132F256GM48-C0 EFR32MG1B132F256GM48-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2017 Active 2 (1 Year) 48 7mm Non-RoHS Compliant 48-VFQFN Exposed Pad 2.4GHz 7mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -99dBm YES 0.5mm S-XQCC-N48 16.5dBm 256kB Flash 32kB RAM 32kB 1.85V~3.8V Zigbee® 250kbps 802.15.4 8.7mA 8.2mA~126.7mA I2C, I2S, SPI, UART 31
EZR32LG330F128R60G-C0 EZR32LG330F128R60G-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks EZR32LG Active 64 9mm RoHS Compliant 64-VFQFN Exposed Pad 142MHz~1.05GHz 9mm Surface Mount -40°C~85°C TA TxRx + MCU e3 Matte Tin (Sn) QUAD NO LEAD 260 3V NOT SPECIFIED -129dBm YES 0.5mm 48 MHz 13dBm 128kB Flash 32kB RAM 38 1.98V~3.8V EZRadioPro 1Mbps 32 YES YES YES 802.15.4 11.1mA~13.7mA 18mA~22mA I2C, SPI, UART, USART, USB 4FSK, 4GFSK, FSK, GFSK, GMSK, MSK, OOK 38
NRF52810-QFAA-T NRF52810-QFAA-T Nordic Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 20 Weeks Tray 2017 Active 2 (1 Year) 48 6mm Non-RoHS Compliant 48-VFQFN Exposed Pad 2.4GHz 6mm Surface Mount -40°C~85°C CMOS 0.95mm 8542.31.00.01 TxRx + MCU QUAD NO LEAD NOT SPECIFIED 3V NOT SPECIFIED -96dBm YES 0.4mm S-XQCC-N48 4dBm 1.7V~3.6V Bluetooth v5.0 2Mbps Bluetooth 4.6mA 4.6mA~25mA I2C, UART 32
CYRF89435-68LTXC CYRF89435-68LTXC Cypress Semiconductor Corp 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 15 Weeks Surface Mount Tray 2012 PRoC® Obsolete 3 (168 Hours) 68 5A991.B.1 8mm ROHS3 Compliant Lead Free Gold 68 68-VFQFN Exposed Pad I2C, SPI No SVHC 13 2.4GHz 8mm Surface Mount 117.310327mg 0°C~70°C CMOS 40μA 1mm 8542.39.00.01 TxRx + MCU e4 QUAD NO LEAD 260 3.3V 30 68 0.4mm Other Microprocessor ICs Not Qualified 2/3.3V 1dBm 32kB Flash 2kB SRAM 1.9V~3.6V 1Mbps -87 dBm General ISM > 1GHZ 18mA 13.7mA~18.5mA I2C, SPI FHSS, GFSK 35
EFR32FG1V132F64GM48-C0 EFR32FG1V132F64GM48-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2017 yes Active 2 (1 Year) 48 7mm Non-RoHS Compliant 48-VFQFN Exposed Pad 2.4GHz 7mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -99dBm YES 0.5mm S-XQCC-N48 16.5dBm 64kB Flash 16kB RAM 1.85V~3.8V Flex Gecko 2Mbps 8.7mA 8.2mA~126.7mA I2C, I2S, SPI, UART 2FSK, 4FSK, GFSK, GMSK, OQPSK 31
EFR32FG1V132F32GM32-C0R EFR32FG1V132F32GM32-C0R Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2016 yes Active 2 (1 Year) 32 5mm Non-RoHS Compliant 32-VFQFN Exposed Pad 2.4GHz 5mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -99dBm YES 0.5mm S-XQCC-N32 16.5dBm 32kB Flash 8kB RAM 1.85V~3.8V Flex Gecko 2Mbps 8.7mA 8.2mA~126.7mA I2C, I2S, SPI, UART 2FSK, 4FSK, GFSK, GMSK, OQPSK 16
EZR32WG230F128R68G-B0R EZR32WG230F128R68G-B0R Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tape & Reel (TR) 2015 EZR32WG Not For New Designs 2 (1 Year) 85°C -40°C RoHS Compliant 64-VFQFN Exposed Pad I2C, SPI, UART, USART 142MHz~1.05GHz Surface Mount -40°C~85°C TxRx + MCU -133dBm 64-QFN (9x9) 20dBm 128kB Flash 32kB RAM 41 1.98V~3.8V EZRadioPro 1Mbps -133 dBm 802.15.4 11.1mA~13.7mA 18mA~88mA I2C, SPI, UART, USART 4FSK, 4GFSK, FSK, GFSK, GMSK, MSK, OOK 41
EZR32HG220F64R69G-B0 EZR32HG220F64R69G-B0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tray 2016 yes Discontinued 3 (168 Hours) Non-RoHS Compliant 48-VFQFN Exposed Pad 142MHz~1.05GHz Surface Mount -40°C~85°C TxRx + MCU -133dBm 20dBm 64kB Flash 8kB RAM 1.98V~3.8V 1Mbps 802.15.4 11.1mA~13.7mA 18mA~108mA I2C, SPI, UART, USART, USB 4GFSK, GFSK, GMSK, OOK 27
ATMEGA1281R231-MU ATMEGA1281R231-MU Microchip Technology 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 13 Weeks Tray 2008 Active 3 (168 Hours) 85°C -40°C ROHS3 Compliant 64-TQFP I2C, SPI 2.4GHz Surface Mount -40°C~85°C TxRx + MCU ATMEGA1281 -101dBm 64-TQFP (14x14) AVR 3dBm 128kB Flash 4kB EEPROM 8kB RAM FLASH 54 8kB 1.8V~3.6V 6LoWPAN, WirelessHART™, Zigbee® 8b 2Mbps -101 dBm 802.15.4, General ISM > 1GHz 10.3mA~12.3mA 7.4mA~14mA SPI O-QPSK 54
JN5174/001K JN5174/001K NXP Semiconductors 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download JN517X Obsolete 3 (168 Hours) ROHS3 Compliant 40-VFQFN Exposed Pad 2.4GHz~2.485GHz Surface Mount -40°C~125°C TxRx + MCU -96.5dBm 10dBm 160kB Flash 4kB EEPROM 32kB RAM 2V~3.6V Zigbee® 802.15.4 12.7mA~14.8mA 14mA~22.5mA I2C, PWM, SPI, UART 1
EFR32BG13P732F512GM32-CR EFR32BG13P732F512GM32-CR Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tape & Reel (TR) EFR32™ Blue Gecko Not For New Designs 3 (168 Hours) RoHS Compliant 32-VFQFN Exposed Pad compliant 2.4GHz Surface Mount -40°C~85°C TxRx + MCU -126.2dBm 19dBm 512kB Flash 64kB RAM 1.8V~3.8V Bluetooth v5.0 1Mbps 802.15.4, Bluetooth 9.5mA 8.5mA~35.3mA I2C, UART, USART 2GFSK, 4GFSK, ASK, BPSK, DBPSK, DSSS, GMSK, OOK, OQPSK 31
EFR32MG1B232F256GM32-B0 EFR32MG1B232F256GM32-B0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tray 2015 Mighty Gecko Discontinued 2 (1 Year) 32 5mm RoHS Compliant 32-VFQFN Exposed Pad 2.4GHz 5mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -99dBm YES 0.5mm S-XQCC-N32 19.5dBm 256kB Flash 32kB RAM Zigbee® 1Mbps 802.15.4 8.6mA~9.1mA 8.2mA I2C, SPI, UART 2FSK, 4FSK, DSSS, GFSK, GMSK, MSK, O-QPSK 31
EFR32FG12P431F1024GL125-C EFR32FG12P431F1024GL125-C Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2018 Flex Gecko Active 3 (168 Hours) RoHS Compliant 125-VFBGA compliant Surface Mount TxRx + MCU -121dBm 20dBm 1MB Flash 256kB RAM I2C, I2S, SPI, UART 65
EFR32FG1P132F128GM32-C0 EFR32FG1P132F128GM32-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray 2017 yes Active 2 (1 Year) 32 5mm Non-RoHS Compliant 32-VFQFN Exposed Pad 2.015GHz 5mm Surface Mount -40°C~85°C 0.9mm 8542.39.00.01 1 TxRx + MCU QUAD NO LEAD 3.3V -99dBm YES 0.5mm S-XQCC-N32 19.5dBm 128kB Flash 32kB RAM 1.85V~3.8V Flex Gecko 2Mbps 8.7mA 8.2mA~126.7mA I2C, I2S, SPI, UART 2FSK, 4FSK, GFSK, GMSK, OQPSK 16
SI1015-C-GM2R SI1015-C-GM2R Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tape & Reel (TR) 2000 Not For New Designs 2 (1 Year) 42 7mm RoHS Compliant 42 42-VFLGA Exposed Pad I2C, SPI, UART 240MHz~960MHz Surface Mount -40°C~85°C 620 kHz TxRx + MCU BOTTOM BUTT 1.9V YES 0.5mm Microcontrollers Not Qualified 1.8/3.6V Yes 8051 25 MHz 13dBm 8kB Flash 768B RAM FLASH 768B 15 5mA 1.8V~3.6V EZRadioPro 8b 15 4 256kbps 8 YES NO YES -121 dBm General ISM < 1GHz 18.5mA 17mA~30mA 8192 768 I2C, SPI, UART FSK, GFSK, OOK
EFR32FG1P131F256IM48-C0 EFR32FG1P131F256IM48-C0 Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tray Flex Gecko Active 2 (1 Year) RoHS Compliant 48-VFQFN Exposed Pad compliant 169MHz~915MHz Surface Mount -40°C~85°C TxRx + MCU 20dBm 256kB Flash 32kB RAM 1.8V~3.8V Flex Gecko 2Mbps 8.2mA~126.7mA I2C, I2S, SPI, UART 32
NRF24LU1P-O17Q32-T NRF24LU1P-O17Q32-T Nordic Semiconductor 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 20 Weeks Surface Mount Tray 2005 Active 3 (168 Hours) 32 5mm ROHS3 Compliant 32-VFQFN Exposed Pad SPI, UART, USB 2.4GHz 5mm Surface Mount -40°C~85°C CMOS 0.95mm 8542.31.00.01 TxRx + MCU QUAD NO LEAD NOT SPECIFIED 3.27V NOT SPECIFIED 0.5mm S-XQCC-N32 0dBm 17kB OTP 2kB SRAM 4V~5.25V 12Mbps -94 dBm General ISM > 1GHZ 12.9mA~13.3mA 11.1mA SPI, UART, USB GFSK 6
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