Iwwert ons Kontaktéiert eis Presentéiert Bom
RFQs(0)
Lëtzebuergesch
Zen mart
View All

W.e.g. bezitt op déi englesch Versioun wéi eis offiziell Versioun.Zéisst

France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English) Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino) United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ) New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português) United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProdukterIntegrierte Circuits (ICs)PMIC - Akkuladeger

PMIC - Akkuladeger

1,625 Produkter fonnt

Produkt Lëscht

1...2627282930313233
Verglach Bild Du props # Hiersteller Beschreiwung Inventaire Ecadmodell RoHS Basiszuel Nummer Supplier Device Package Schutzfehler Aktuell - Léisung Programmable Funktioun Akku Pack Voltage Spannung - Versuergung (Max) Verpakung Bleif Free Status / RoHS Status Feuchtigkeit Sensibilitéitniveau (MSL) Basis Produktnummer Package protegéieren Fabrik Standard Lead Time Detailbeschreiwung Serie Operatioun Temperatur Mounting Type Batterie Chemie Zuel vun Zellen Charge Stroum - Max Interface Package / Case Quantitéit
BQ21062YFPR Texas Instruments IC BATT CHG LI-ION 1CELL 20DSBGA Op Lager22863 pcs - 20-DSBGA Over Current, Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current, Voltage 2.4V ~ 4.6V 5.25V - - - BQ21062 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 500mA I²C 20-XFBGA, DSBGA
AAT3672IWO-4.2-2-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 14TDFN Op Lager13920 pcs - 14-TDFN (3x3) Over Current, Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.2V 6.5V - - - AAT3672 Tape & Reel (TR) - - BatteryManager™ -25°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.6A USB 14-WFDFN Exposed Pad
MAX8808ZETA+T Analog Devices Inc./Maxim Integrated IC BATT CHG Op Lager9690 pcs - - - - - - - - - - MAX8808 Bulk - - * - - - - - - -
AAT3672IWO-4.2-1-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 14TDFN Op Lager10170 pcs - 14-TDFN (3x3) Over Current, Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.2V 6.5V - - - AAT3672 Tape & Reel (TR) - - - -25°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.6A USB 14-WFDFN Exposed Pad
ISL9538BHRTZ-T Renesas Electronics America Inc IC BATT CHG LI-ION 2-4CEL 32TQFN Op Lager8461 pcs - 32-TQFN (4x4) Over Current, Over Temperature Constant - Programmable Current 2.4V ~ 18.304V 23.4V - - - ISL9538 Tape & Reel (TR) - - - - Surface Mount Lithium Ion/Polymer 2 ~ 4 - I²C, SMBus 32-WFQFN Exposed Pad
BQ24735SRGRT Texas Instruments PROTOTYPE Op Lager9810 pcs - 20-VQFN (3.5x3.5) Over Current, Over Voltage, Short Circuit Constant - Programmable Current, Voltage 19.2V (Max) 24V - - - - Bulk - - - 0°C ~ 125°C (TJ) Surface Mount Lithium Ion 1 ~ 4 8.128A I²C 20-VFQFN Exposed Pad
ISL9538CHRTZ-T Renesas Electronics America Inc IC BATT CHG LI-ION 2-4CEL 32TQFN Op Lager7174 pcs - 32-TQFN (4x4) Over Current, Over Temperature Constant - Programmable Current 2.4V ~ 18.304V 23.4V - - - ISL9538 Tape & Reel (TR) - - - - Surface Mount Lithium Ion/Polymer 2 ~ 4 - I²C, SMBus, USB 32-WFQFN Exposed Pad
BQ24735FRGRR Texas Instruments PROTOTYPE Op Lager13540 pcs - 20-VQFN (3.5x3.5) Over Current, Over Voltage, Short Circuit Constant - Programmable Current, Voltage 19.2V (Max) 24V - - - - Bulk - - - -40°C ~ 85°C (TA) Surface Mount Multi-Chemistry 1 ~ 4 8.128A I²C 20-VFQFN Exposed Pad
MP2613ER-LF-P Monolithic Power Systems Inc. IC BATT CHG LI-ION 21QFN Op Lager14222 pcs - 21-QFN (3x3) - - - - - - - - MP2613 Tape & Reel (TR) - - - - Surface Mount - - - - 21-PowerVFQFN
MAX14676DEWO+T Analog Devices Inc./Maxim Integrated IC BATT CHG LI-ION 42WLP Op Lager10040 pcs - 42-WLP - - - - - - - - MAX14676 Tape & Reel (TR) - - ModelGauge™ - Surface Mount Lithium Ion - - - 42-WFBGA, WLBGA
BQ25100BYFPR Texas Instruments IC BATT CHG LI-ION 1CELL 6DSBGA Op Lager53930 pcs - 6-DSBGA Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 4.284V 6.45V - - - BQ25100 Tape & Reel (TR) - - - -5°C ~ 125°C (TJ) Surface Mount Lithium Ion/Polymer 1 250mA USB 6-XFBGA, DSBGA
BQ25121AYFPT Texas Instruments IC BAT CHG MULT-CHEM 1CL 25DSBGA Op Lager9230 pcs - 25-DSBGA Over Current, Over Voltage, Short Circuit Constant Current, Timer, Voltage 4.65V 5.5V - - - BQ25121 Tape & Reel (TR) - - - -40°C ~ 85°C Surface Mount Multi-Chemistry 1 300mA I²C 25-XFBGA, DSBGA
MP26028EQ-LF-Z Monolithic Power Systems Inc. 1A LINEAR LI-ION BATTERY CHARGER Op Lager37981 pcs - 10-QFN (3x3) Over Current, Over Temperature, Over Voltage Constant Current, Timer, Voltage - 6.5V - - - - Tape & Reel (TR) - - MP -20°C ~ 85°C (TA) Surface Mount Lithium Ion 1 1A - 10-VFDFN Exposed Pad
BQ25121AYFPR Texas Instruments IC BAT CHG MULT-CHEM 1CL 25DSBGA Op Lager18555 pcs - 25-DSBGA Over Current, Over Voltage, Short Circuit Constant Current, Timer, Voltage 4.65V 5.5V - - - BQ25121 Tape & Reel (TR) - - - -40°C ~ 85°C Surface Mount Multi-Chemistry 1 300mA I²C 25-XFBGA, DSBGA
AAT2557ITO-CW-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 14TSOP Op Lager14670 pcs - 14-TSOPJW Over Current, Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 4.2V 6.5V - - - AAT2557 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 500mA USB 14-TFSOJ (0.094', 2.40mm Width)
BQ24703PWRG4 Texas Instruments IC BATT CHARGER CTRLR 24-TSSOP Op Lager11467 pcs BQ24703 24-TSSOP - - - - 28V Tape & Reel (TR) Lead free / RoHS Compliant 1 (Unlimited) - - 28 Weeks Charger IC Multi-Chemistry 24-TSSOP - -40°C ~ 85°C (TA) - Multi-Chemistry - - - 24-TSSOP (0.173", 4.40mm Width)
MAX1645AEEI Analog Devices Inc./Maxim Integrated IC BAT CHG MULTCHEM 1-4CL 28QSOP Op Lager11350 pcs - 28-QSOP - - - 18.4V (Max) 28V - - - MAX1645 Bag - - - -40°C ~ 85°C (TA) Surface Mount Multi-Chemistry 1 ~ 4 3A I²C, SMBus 28-SSOP (0.154', 3.90mm Width)
BQ24035RHLRG4 Texas Instruments IC CHARGE MGMT BQTINY-III 20VQFN Op Lager16394 pcs BQ24035 20-VQFN (3.5x4.5) Over Temperature, Reverse Current, Short Circuit Constant - Programmable Current, Timer 4.2V 16V Tape & Reel (TR) Lead free / RoHS Compliant 2 (1 Year) - - 23 Weeks Charger IC Lithium Ion/Polymer 20-VQFN (3.5x4.5) bqTINY™ III -40°C ~ 125°C (TJ) - Lithium Ion/Polymer 1 1.5A USB 20-VFQFN Exposed Pad
BQ25120YFPT Texas Instruments IC BATT CHG LI-ION 1CELL 25DSBGA Op Lager8052 pcs - 25-DSBGA Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 4.2V 5.5V - - - BQ25120 Tape & Reel (TR) - - - -40°C ~ 125°C (TJ) Surface Mount Lithium Ion/Polymer 1 300mA I²C 25-XFBGA, DSBGA
AAT3663IWO-8.4-2-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 2CELL 14TDFN Op Lager10040 pcs - 14-TDFN (3x3) Over Current, Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 8.4V 13.2V - - - AAT3663 Tape & Reel (TR) - - BatteryManager™ -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 2 1A USB 14-WFDFN Exposed Pad
MP26029GQ-0000-Z Monolithic Power Systems Inc. STAND-ALONE 1A LINEAR LI-ION BAT Op Lager62640 pcs - 10-QFN (3x3) Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.5V 6.05V - - - - Tape & Reel (TR) - - MP -40°C ~ 125°C (TJ) Surface Mount Lithium Ion/Polymer 1 1A - 10-VFDFN Exposed Pad
ADP5061ACBZ-4-R7 Analog Devices Inc. IC BATT CHG LI-ION 1CELL 20WLCSP Op Lager18026 pcs - 20-WLCSP (2x2.6) - Constant - Programmable - 4.3V 6.7V - - - ADP5061 Tape & Reel (TR) - - - -40°C ~ 125°C (TJ) Surface Mount Lithium Ion 1 1.3A I²C, USB 20-WFBGA, WLCSP
AAT3696SIWP-T1 Skyworks Solutions Inc. IC LI-ION CHARGER 12TDFN Op Lager10040 pcs - 12-TDFN (3x3) Over Current, Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 4.2V 6.5V - - - AAT3696 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.6A USB 12-WFDFN Exposed Pad
ADP3808AJCPZ-RL onsemi ADP3808 - HIGH EFFICIENCY SWITCH Op Lager7460 pcs - - - - - - - - - - - - - - - - - - - - - -
ADP5061ACBZ-5-R7 Analog Devices Inc. IC BATT CHG LI-ION 1CELL 20WLCSP Op Lager14347 pcs - 20-WLCSP (2x2.6) - Constant - Programmable - 4.3V 6.7V - - - ADP5061 Tape & Reel (TR) - - - -40°C ~ 125°C (TJ) Surface Mount Lithium Ion 1 1.3A I²C, USB 20-WFBGA, WLCSP
BQ24192HRGER Texas Instruments PROTOTYPE Op Lager8300 pcs - 24-VQFN (4x4) Over Current, Over Temperature, Over Voltage Constant - Programmable Current, Timer, Voltage 4.4V (Max) 17V - - - - Bulk - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 4.5A I²C 24-VFQFN Exposed Pad
BQ25971YFFR Texas Instruments IC BAT CHG MULT-CHEM 1CL 56DSBGA Op Lager13365 pcs - 56-DSBGA (3.33x2.93) Over Current, Over Voltage - - 4.65V 12V - - - BQ25971 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Multi-Chemistry 1 8A I²C 56-UFBGA, DSBGA
MAX14598EEWV+T Analog Devices Inc./Maxim Integrated IC INTEGRATED CIRCUIT Op Lager4120 pcs - - - - - - - - - - MAX14598 Tape & Reel (TR) - - * - - - - - - -
AAT3672IWO-4.2-3-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 14TDFN Op Lager12930 pcs - 14-TDFN (3x3) Over Current, Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.2V 6.5V - - - AAT3672 Tape & Reel (TR) - - BatteryManager™ -25°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.6A USB 14-WFDFN Exposed Pad
LTC3552EDHC#PBF Linear Technology LTC3552 - Standalone Linear Li-I Op Lager5820 pcs - 16-DFN (5x3) Over Temperature, Reverse Battery, Short Circuit Constant - Programmable Current, Voltage 4.2V 8V - - - - Bulk - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion 1 950mA - 16-WFDFN Exposed Pad
MAX77819EWB+T Analog Devices Inc./Maxim Integrated INTEGRATED CIRCUIT Op Lager15940 pcs - - - - - - - - - - MAX77819 Tape & Reel (TR) - - * - - - - - - -
MP2635AGR-Z Monolithic Power Systems Inc. 2A SINGLE CELL SWITCHING CHARGER Op Lager44600 pcs - 24-QFN (4x4) Over Current, Over Voltage Constant - Programmable Current, Timer, Voltage 4.35V (Max) 6V - - - - Tape & Reel (TR) - - MP -40°C ~ 125°C (TJ) Surface Mount Lithium Ion/Polymer 1 2A - 24-PowerVFQFN
FAN54300UCX Fairchild Semiconductor IC BATT CHG PWR SUP SUPPORT CIRC Op Lager63010 pcs - 30-WLCSP (2.46x2.26) Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current, Timer, Voltage - 9.5V - - - FAN54300 Bulk - - - -30°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.5A I²C 30-UFBGA, WLCSP
BQ2057CTSG4 Texas Instruments IC LI-ION LDO CHRG MGMT 8-TSSOP Op Lager22669 pcs BQ2057 8-TSSOP - Constant - Programmable Current 4.2V 15V Tube Lead free / RoHS Compliant 2 (1 Year) - - 28 Weeks Charger IC Lithium Ion/Polymer 8-TSSOP - -20°C ~ 70°C (TA) - Lithium Ion/Polymer 1 - - 8-TSSOP (0.173", 4.40mm Width)
MAX17087GTL+TG38 Analog Devices Inc./Maxim Integrated IC INTEGRATED CIRCUIT Op Lager16790 pcs - - - - - - - - - - MAX17087 Tape & Reel (TR) - - * - - - - - - -
BQ25121YFPR Texas Instruments IC BATT CHG LI-ION 1CELL 25DSBGA Op Lager16450 pcs - 25-DSBGA Over Voltage Constant - Programmable Current 4.2V 5.5V - - - BQ25121 Tape & Reel (TR) - - - -40°C ~ 125°C (TJ) Surface Mount Lithium Ion 1 300mA I²C 25-XFBGA, DSBGA
MAX1645BEEI+T Analog Devices Inc./Maxim Integrated IC BAT CHG MULTCHEM 1-4CL 28QSOP Op Lager10920 pcs - 28-QSOP - - - 18.4V (Max) 28V - - - MAX1645 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Multi-Chemistry 1 ~ 4 3A I²C, SMBus 28-SSOP (0.154", 3.90mm Width)
MAX8808XETA+T Analog Devices Inc./Maxim Integrated IC BATT CHG LI-ION 1CELL 8TDFN Op Lager16261 pcs - 8-TDFN-EP (2x2) Over Voltage Constant - Programmable - 4.2V 6.5V - - - MAX8808 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion 1 1A - 8-WFDFN Exposed Pad
BQ2057WSNG4 Texas Instruments IC LITH-ION LDO CHRG MGMT 8-SOIC Op Lager19197 pcs BQ2057 8-SOIC - Constant - Programmable Current 8.4V 15V Tube Lead free / RoHS Compliant 1 (Unlimited) - - 28 Weeks Charger IC Lithium Ion/Polymer 8-SOIC - -20°C ~ 70°C (TA) - Lithium Ion/Polymer 2 - - 8-SOIC (0.154", 3.90mm Width)
MAX1645BEEI+ Analog Devices Inc./Maxim Integrated IC BAT CHG MULTCHEM 1-4CL 28QSOP Op Lager7850 pcs - 28-QSOP - - - 18.4V (Max) 28V - - - MAX1645 Tube - - - -40°C ~ 85°C (TA) Surface Mount Multi-Chemistry 1 ~ 4 3A I²C, SMBus 28-SSOP (0.154", 3.90mm Width)
BQ24161CYFFR Texas Instruments PROTOTYPE Op Lager17170 pcs - - - - - - - - - - - Bulk - - - - - - - - - -
XC6803A2E14R-G Torex Semiconductor Ltd IC BATT CHG LI-ION 1CELL 6USPEL Op Lager74500 pcs - 6-USPEL (1.8x2) Over Current, Over Temperature, Over Voltage, Reverse Current Constant - Programmable Current 4.2V 6V - - - XC6803 Tape & Reel (TR) - - XC680x -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 280mA - 6-XDFN Exposed Pad
MP26029GN-0000-Z Monolithic Power Systems Inc. STAND-ALONE 1A LINEAR LI-ION BAT Op Lager69070 pcs - 8-SOIC-EP Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.5V 6.05V - - - - Tape & Reel (TR) - - MP -40°C ~ 125°C (TJ) Surface Mount Lithium Ion/Polymer 1 1A - 8-SOIC (0.154", 3.90mm Width) Exposed Pad
BQ2954SNG4 Texas Instruments IC LITH-ION FAST CHARGER 16-SOIC Op Lager7464 pcs BQ2954 16-SOIC - Constant Current - 5.5V Tube Lead free / RoHS Compliant 2 (1 Year) - - 28 Weeks Charger IC Lithium Ion 16-SOIC - -40°C ~ 85°C (TA) - Lithium Ion - - - 16-SOIC (0.154", 3.90mm Width)
AAT2557ITO-CT-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 14TSOP Op Lager4690 pcs - 14-TSOPJW Over Current, Over Temperature, Over Voltage, Short Circuit Constant - Programmable Current 4.2V 6.5V - - - AAT2557 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 500mA USB 14-TFSOJ (0.094', 2.40mm Width)
MAX77819EWB+ Analog Devices Inc./Maxim Integrated IC INTEGRATED CIRCUIT Op Lager5560 pcs - - - - - - - - - - MAX77819 Tube - - * - - - - - - -
BQ2057CDGKG4 Texas Instruments IC LI-ION LDO CHRG MGMT 8VSSOP Op Lager29420 pcs BQ2057 8-VSSOP - Constant - Programmable Current 4.2V 15V Tube Lead free / RoHS Compliant 2 (1 Year) - - 28 Weeks Charger IC Lithium Ion/Polymer 8-VSSOP - -20°C ~ 70°C (TA) - Lithium Ion/Polymer 1 - - 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
AAT3683IOQ-4.2-2-T1 Skyworks Solutions Inc. IC LI-ION CHARGER 16TDFN Op Lager5330 pcs - 10-STDFN (2.2x2.2) Over Current, Over Temperature, Over Voltage Constant - Programmable Current, Timer 4.2V 7.5V - - - AAT3683 Tape & Reel (TR) - - BatteryManager™ -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1A USB 10-UFDFN Exposed Pad
AAT3635IUH-1-T1 Skyworks Solutions Inc. IC BATT CHG LI-ION 1CELL 36WLCSP Op Lager16440 pcs - 36-WLCSP (3x3) Over Current, Over Voltage Constant - Programmable Current, Voltage 4.44V (Max) 6.5V - - - AAT3635 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion/Polymer 1 1.55A I²C 36-WFBGA, WLCSP
AUR9807DIGD Diodes Incorporated IC BATT CHG LI-ION 1CELL 20QFN Op Lager83820 pcs - 20-QFN (4.5x3.5) Over Temperature, Over Voltage, Reverse Current, Short Circuit Constant - Programmable Timer 4.2V 5.5V - - - AUR9807 Tape & Reel (TR) - - - -40°C ~ 85°C (TA) Surface Mount Lithium Ion 1 1.5A - 20-WFQFN Exposed Pad
1...2627282930313233
Allelco
Iwwer eis
Geschicht
Zöreerten
Reounen
Politik
Bedénglech
Privatsphär Politik
Cookie Politik
Servicer
Zougrëffshueler
Retour & Ersatz
Oft gestallten Froen
Kontaktéiert eis
Uerdsmëschuerdnung
Liwwerung & Liwwert
Bezuelmethoden
Mäi Kont
The BlogsHot PartsChange LanguageNewsSite map
Kontaktéiert eis
Sëtz Adress:
Raum c 13 / f Harvard kommerziell Gebai
105-111 Thomson Strooss Wan Chai
Hongkong
Déngschtlech De SLL: + 852-91464856
Service E-Mail: info@allelco.com
Komm mat éis mat
Copyright © 2012-2023 AllelcoElec.com.All Rechter reservéiert.
0 RFQ
Akaafsweenschen (0 Items)
Et ass eidel.
Gitt Ufro of
Vergläichen Lëscht (0 Items)
Et ass eidel.
Fsopillfot

Äre Feedback ass wichteg!Groussaafe weisen mir d'Benotzer Erfahrung an een stervéiere se stäerkft ze verleeën.Aaat deelt Äre Kommentarer mat eise Kommentéierende mat eis iwwer eise Fokusformlatioun, a mir äntwert direkt op.
MERCI, Dir fir Allelco ze wielen.

Sujet
E-Mail
Commentairen
Captcha
Drag oder klickt fir Datei eropzelueden
Eck Kontext
Aarte: .xls, .xlsx, .doc, .Docx, .jpg, .png an .pdf.
Max Dateigréisst: 10MB