Tungkol sa atin Makipag-ugnayan sa amin Magsumite ng bom
RFQs(0)
Pilipino
Isara ang menu
Tingnan lahat

Mangyaring sumangguni sa bersyon ng Ingles bilang aming opisyal na bersyon.Bumalik

Europa
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)
Asya-Pasipiko
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India at Gitnang Silangan
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
Timog Amerika / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
Hilagang Amerika
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
BahayMga ProduktooptoelectronicsLED Pag-iilaw - Color

LED Pag-iilaw - Color

Natagpuan ang mga produktong 39

Listahan ng produkto

1
Paghambingin Larawan Bahagi # Manufacturer Paglalarawan Inventory Modelo ng ECAD RoHS Boltahe - Ipasa (Vf) (Typ) Package Base Number Product Luminous flux @ kasalukuyang/temperatura Thermal paglaban ng Package Lumens / Watt @ Current - Test Temperatura - Test pagtingin sa Anggulo haba ng daluyong serye Current - Test Current - Max Supplier aparato Package Package / Kaso Taas - Makaupo (Max) Sukat / Dimension Salalayan Type kulay Dami
XMLCTW-A0-0000-00C2AAAC1 XMLCTW-A0-0000-00C2AAAC1 CreeLED, Inc. LED XLAMP XML RGBW SMD Sa stock5460 pcs 2.25V Red, 3.3V Green, 3.1V Blue, 3.1V White Bulk XMLCTW 67lm Red, 101lm Green, 27lm Blue, 90lm White 3.5°C/W 85 lm/W Red, 87 lm/W Green, 25 lm/W Blue, 83 lm/W White 25°C 130° 625nm Red, 528nm Green, 458nm Blue, 3200K White XLamp® XM-L 350mA Red, 350mA Green, 350mA Blue, 350mA White 1A Red, 1A Blue, 1A Green, 1A White SMD 2020 (5050 Metric) 0.124" (3.15mm) 0.197" Dia x 0.197" W (5.00mm x 5.00mm) Surface Mount Red, Green, Blue, White - Warm (RGBW)
R42180-01 R42180-01 Seoul Semiconductor Inc. LED Z-POWER RED 625NM SMD Sa stock5260 pcs 2.3V Tape & Reel (TR) R42180 48lm (Typ) 7.8°C/W 60 lm/W 25°C 130° 625nm (Typ) Z Power 350mA 800mA SMD 2-SMD, Gull Wing Exposed Pad 0.208' (5.28mm) 0.315' Dia (8.00mm) Surface Mount Red
LXZ1-PD01 LXZ1-PD01 Lumileds LED LUXEON Z RED 633NM SMD Sa stock27197 pcs 2.2V Tape & Reel (TR) LXZ1 48lm (40lm ~ 56lm) 8°C/W 44 lm/W 25°C 145° 633nm (620nm ~ 645nm) LUXEON Z 500mA 700mA SMD 0705 (1713 Metric) 0.026" (0.66mm) 0.067" L x 0.051" W (1.70mm x 1.30mm) Surface Mount Red
LXML-PB01-0030 LXML-PB01-0030 Lumileds LED LUXEON REBEL BLUE 470NM SMD Sa stock14481 pcs 2.95V Tape & Reel (TR) LXML 35lm (Typ) 10°C/W 34 lm/W 25°C 125° 470nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Blue
LXZ1-PM01 LXZ1-PM01 Lumileds LED LUXEON Z GREEN 530NM SMD Sa stock26045 pcs 2.85V Tape & Reel (TR) LXZ1 88lm (80lm ~ 96lm) 5°C/W 62 lm/W 25°C 125° 530nm (520nm ~ 540nm) LUXEON Z 500mA 1A SMD 0705 (1713 Metric) 0.026" (0.66mm) 0.067" L x 0.051" W (1.70mm x 1.30mm) Surface Mount Green
LXML-PR01-0500 LXML-PR01-0500 Lumileds LED LUXEON REBEL BLUE 448NM SMD Sa stock19195 pcs 2.95V Tape & Reel (TR) LXML 520mW (Typ) 10°C/W - 25°C 125° 448nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Blue
ASMT-MT00-00001 ASMT-MT00-00001 Broadcom Limited LED MOONSTONE RGB 625/525/460NM Sa stock4330 pcs 2.1V Red, 3.2V Green, 3.2V Blue Tape & Reel (TR) ASMT-MT00 40lm Red, 85lm Green, 22lm Blue 23°C/W Red, 20°C/W Green, 20°C/W Blue 54 lm/W Red, 76 lm/W Green, 20 lm/W Blue 25°C 120° 625nm Red, 525nm Green, 460nm Blue Moonstone™ 350mA Red, 350mA Green, 350mA Blue 350mA Red, 350mA Green, 350mA Blue - TO-252-3, DPak (2 Leads + Tab), SC-63 0.134' (3.40mm) 0.335' L x 0.335' W (8.50mm x 8.50mm) Surface Mount Red, Green, Blue (RGB)
LXML-PE01-0060 LXML-PE01-0060 Lumileds LED LUXEON REBEL CYAN 505NM SMD Sa stock15445 pcs 2.9V Tape & Reel (TR) LXML 64lm (60lm ~ 67lm) 10°C/W 63 lm/W 25°C 125° 505nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Cyan
LXML-PM01-0100 LXML-PM01-0100 Lumileds LED LUXEON REBEL GREEN 530NM SMD Sa stock17577 pcs 2.9V Tape & Reel (TR) LXML 102lm (Typ) 10°C/W 100 lm/W 25°C 125° 530nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Green
XPEBAM-L1-0000-00801 XPEBAM-L1-0000-00801 CreeLED, Inc. LED XLAMP XPE2 AMBER 590NM SMD Sa stock35607 pcs 2.2V Tape & Reel (TR) XPEBAM 77lm (74lm ~ 81lm) 7°C/W 100 lm/W 25°C 130° 590nm (585nm ~ 595nm) XLamp® XP-E2 350mA 1A SMD 1414 (3535 Metric) 0.094" (2.39mm) 0.136" L x 0.136" W (3.45mm x 3.45mm) Surface Mount Amber
LXML-PR01-0425 LXML-PR01-0425 Lumileds LED LUXEON REBEL ROYAL SMD Sa stock3820 pcs 2.95V Cut Tape (CT) LXML - 10°C/W - - 125° 448nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1816 (4540 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Royal Blue
LXM2-PH01-0070 LXM2-PH01-0070 Lumileds LED LUXEON REBEL ORG 617NM SMD Sa stock18913 pcs 2.1V Tape & Reel (TR) LXM2 72lm (Typ) 8°C/W 98 lm/W 25°C 125° 617nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Red-Orange
LXM2-PL01-0000 LXM2-PL01-0000 Lumileds LED LUXEON REBEL AMBER 591NM SMD Sa stock16923 pcs 3.05V Tape & Reel (TR) LXM2 110lm (Typ) 10°C/W 103 lm/W 25°C 120° 591nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Amber
ASMT-QABD-AEF0E ASMT-QABD-AEF0E Broadcom Limited LED AMBER 591NM 0.5W 4PLCC Sa stock3790 pcs 2.3V Tape & Reel (TR) ASMT-QAB 16lm (12lm ~ 20lm) 60°C/W 46 lm/W 25°C 120° 591nm (583nm ~ 598nm) - 150mA 300mA 4-PLCC 4-PLCC 0.083" (2.10mm) 0.126" L x 0.110" W (3.20mm x 2.80mm) Surface Mount Amber
LXM2-PD01-0050 LXM2-PD01-0050 Lumileds LED LUXEON REBEL RED 627NM SMD Sa stock15695 pcs 2.1V Tape & Reel (TR) LXM2 53lm (Typ) 8°C/W 72 lm/W 25°C 125° 627nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Red
LXM2-PD01-0040 LXM2-PD01-0040 Lumileds LED LUXEON REBEL RED 627NM SMD Sa stock25488 pcs 2.1V Tape & Reel (TR) LXM2 48lm (Typ) 8°C/W 65 lm/W 25°C 125° 627nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Red
LXM3-PD01 LXM3-PD01 Lumileds LED LUXEON REBEL RED 655NM SMD Sa stock27670 pcs 2.1V Tape & Reel (TR) LXM3 305mW (260mW ~ 350mW) 8°C/W - 25°C 125° 655nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Red
ASMT-QAB2-FDE0E ASMT-QAB2-FDE0E Broadcom Limited LED AMBER 591NM 4PLCC Sa stock4500 pcs 2.7V Tape & Reel (TR) ASMT-QAB 12lm (9lm ~ 15lm) 60°C/W 30 lm/W 25°C 120° 591nm (583nm ~ 598nm) - 150mA 150mA 4-PLCC 4-PLCC 0.083" (2.10mm) 0.126" L x 0.110" W (3.20mm x 2.80mm) Surface Mount Amber
LXML-PX02-0000 LXML-PX02-0000 Lumileds LED LUXEON REBEL LIME 568NM SMD Sa stock12138 pcs 2.75V Tape & Reel (TR) LXML 184lm (Typ) 6°C/W 191 lm/W 85°C 125° 568nm (566nm ~ 569nm) LUXEON Rebel Color ES 350mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Lime
LXZ1-PB01 LXZ1-PB01 Lumileds LED LUXEON Z BLUE 470NM SMD Sa stock26608 pcs 2.85V Tape & Reel (TR) LXZ1 32lm (24lm ~ 40lm) 5°C/W 22 lm/W 25°C 125° 470nm (460nm ~ 480nm) LUXEON Z 500mA 1A SMD 0705 (1713 Metric) 0.026" (0.66mm) 0.067" L x 0.051" W (1.70mm x 1.30mm) Surface Mount Blue
ELSW-F91R3-0LPNM-BR4R6 ELSW-F91R3-0LPNM-BR4R6 Everlight Electronics Co Ltd LED SHWO RED 623NM SMD Sa stock17373 pcs 2.65V Tape & Reel (TR) ELSW-F91 95lm (90lm ~ 100lm) 8°C/W 51 lm/W 25°C 120° 623nm (615nm ~ 630nm) SHWO 700mA 750mA SMD 1414 (3535 Metric) 0.088' (2.23mm) 0.138' L x 0.138' W (3.50mm x 3.50mm) Surface Mount Red
ASMT-AB31-NMP00 ASMT-AB31-NMP00 Broadcom Limited LED BLUE 460NM 2SMD Sa stock18273 pcs 3.2V Tube ASMT-AB31 18lm (Typ) 10°C/W 16 lm/W 25°C 140° 460nm (Typ) - 350mA 700mA 2-SMD 2-SMD, Gull Wing Exposed Pad 0.165" (4.20mm) 0.315" Dia (8.00mm) Surface Mount Blue
LXML-PL01-0040 LXML-PL01-0040 Lumileds LED LUXEON REBEL AMBER 590NM SMD Sa stock15774 pcs 2.1V Tape & Reel (TR) LXML 44lm (40lm ~ 48lm) 12°C/W 60 lm/W 25°C 125° 590nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Amber
EAPL2835BA3 EAPL2835BA3 Everlight Electronics Co Ltd LED BLUE MID PWR 2PLCC Sa stock342050 pcs 3.15V Tape & Reel (TR) EAPL2835 4lm (Typ) 21°C/W 21 lm/W 25°C 120° - - 60mA 150mA 2-PLCC 1411 (3528 Metric) 0.033" (0.85mm) 0.138" L x 0.110" W (3.50mm x 2.80mm) Surface Mount Blue
ASMT-JR30-ARS01 ASMT-JR30-ARS01 Broadcom Limited LED RED 628NM 3W Sa stock18775 pcs 2.1V Tape & Reel (TR) ASMT-JR30 54lm (40lm ~ 67lm) 9°C/W 73 lm/W 25°C 165° 628nm (620nm ~ 635nm) - 350mA 700mA - 6-SMD, Flat Lead Exposed Pad 0.077' (1.95mm) 0.157' L x 0.157' W (4.00mm x 4.00mm) Surface Mount Red
LXM2-PH01-0060 LXM2-PH01-0060 Lumileds LED LUXEON REBEL ORG 617NM SMD Sa stock16840 pcs 2.1V Tape & Reel (TR) LXM2 67lm (Typ) 8°C/W 91 lm/W 25°C 125° 617nm (Typ) LUXEON Rebel Color 350mA 700mA SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Red-Orange
MCE4CT-A2-0000-00A5AAAA1 MCE4CT-A2-0000-00A5AAAA1 CreeLED, Inc. LED XLAMP MCE RGBW SMD Sa stock4790 pcs 2.1V Red, 3.4V Green, 3.2V Blue, 3.2V White Tape & Reel (TR) MCE4CT 31lm Red, 67lm Green, 8lm Blue, 100lm White 6°C/W 42 lm/W Red, 56 lm/W Green, 7 lm/W Blue, 89 lm/W White, Cool 25°C 115° 625nm Red, 528nm Green, 458nm Blue, 6350K White XLamp® MC-E 350mA Red, 350mA Green, 350mA Blue, 350mA White 700mA Red, 700mA Green, 700mA Blue, 700mA White SMD 8-SMD, Gull Wing Exposed Pad 0.184' (4.68mm) 0.276' L x 0.295' W (7.00mm x 7.50mm) Surface Mount Red, Green, Blue, White - Cool (RGBW)
LXML-PM01-0090 LXML-PM01-0090 Lumileds LED LUXEON REBEL GREEN 530NM SMD Sa stock19690 pcs 2.9V Tape & Reel (TR) LXML 95lm (Typ) 10°C/W 94 lm/W 25°C 125° 530nm (Typ) LUXEON Rebel Color 350mA 1A SMD 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Green
XRCBLU-L1-0000-00H01 XRCBLU-L1-0000-00H01 CreeLED, Inc. LED XLAMP XRC BLUE 470NM SMD Sa stock4890 pcs 3.5V Tape & Reel (TR) XRCBLU 21lm (18lm ~ 24lm) 12°C/W 17 lm/W 25°C 100° 470nm (465nm ~ 475nm) XLamp® XR-C 350mA 500mA SMD 3529 (9073 Metric) 0.181' (4.60mm) 0.354' L x 0.276' W (9.00mm x 7.00mm) Surface Mount Blue
VLMY71AAAC-GS08 Vishay Semiconductor Opto Division SMD LED LITTLE STAR YELLOW Sa stock4380 pcs 2.5V Cut Tape (CT) VLMY71 30lm (21lm ~ 39lm) 20°C/W 30 lm/W 25°C 120° 591nm (585nm ~ 597nm) Little Star® 400mA 400mA SMD 2424 (6060 Metric) 0.059" (1.50mm) 0.236" L x 0.236" W (6.00mm x 6.00mm) Surface Mount Yellow
LXML-PR02-A900 Lumileds LED LUXEON REBEL BLUE 448NM SMD Sa stock34850 pcs 2.9V Tape & Reel (TR) LXML 965mW (900mW ~ 1030mW) 6°C/W - 25°C 125° 448nm (Typ) LUXEON Rebel Color ES 700mA 1A SMD 1812 (4532 Metric) 0.083' (2.10mm) 0.177' L x 0.120' W (4.49mm x 3.05mm) Surface Mount Blue
LXML-PD01-0040 Lumileds RED Sa stock26576 pcs 2.9V Tape & Reel (TR) LXML 46lm (Typ) - 45 lm/W 25°C 125° 633nm LUXEON Rebel Color Line 350mA 700mA 1812 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Red
LXZ1-PL03 Lumileds LED LUXEON Z AMBER 599NM SMD Sa stock28208 pcs 2.25V Tape & Reel (TR) LXZ1 - - 18 lm/W 85°C 145° 599nm LUXEON Z 500mA 700mA SMD 0705 (1713 Metric) 0.038" (0.96mm) 0.067" L x 0.051" W (1.70mm x 1.30mm) Surface Mount Amber
LXML-PD01-0050 Lumileds RED Sa stock26070 pcs 2.9V Tape & Reel (TR) LXML 52lm (Typ) - 51 lm/W 25°C 125° 633nm LUXEON Rebel Color Line 350mA 700mA 1812 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Red
ASMC-QHB2-TCD0E Broadcom Limited LED ENVISIUM RED 618NM 4PLCC Sa stock3620 pcs 2.64V Tape & Reel (TR) ASMC-QHB2 9lm (7lm ~ 12lm) 60°C/W 23 lm/W 25°C 120° 618nm (611nm ~ 625nm) Envisium™ 150mA 300mA 4-PLCC 4-PLCC 0.083' (2.10mm) 0.126' L x 0.110' W (3.20mm x 2.80mm) Surface Mount Red
LTST-008GEBW Lite-On Inc. LTST-008GEBW SIDE VIEW TYPE Sa stock114620 pcs 2.1V Red, 3.15V Green, 3V Blue Tape & Reel (TR) LTST-008 2lm Red (1lm ~ 3lm), 5lm Green (3lm ~ 7lm), 0.57lm Blue (0.32lm ~ 0.82lm) - 48 lm/W Red, 64 lm/W Green, 13 lm/W Blue 25°C 130° 623nm Red, 526nm Green, 460nm Blue - 20mA Red, 25mA Green, 15mA Blue 30mA Red, 30mA Green, 30mA Blue - 8-SMD, No Lead 0.039" (1.00mm) 0.177" L x 0.049" W (4.50mm x 1.25mm) Surface Mount, Right Angle Red, Green, Blue (RGB)
LXML-PB01-0023 Lumileds BLUE Sa stock5470 pcs 2.95V Tape & Reel (TR) LXML 28lm (Typ) - 27 lm/W 25°C 125° 473nm LUXEON Rebel Color Line 350mA 1A 1812 1812 (4532 Metric) 0.083" (2.10mm) 0.177" L x 0.120" W (4.49mm x 3.05mm) Surface Mount Blue
LTST-008BGEW Lite-On Inc. LTST-008BGEW SIDE VIEW TYPE Sa stock194380 pcs 2.1V Red, 3.2V Green, 3.2V Blue Tape & Reel (TR) LTST-008 1lm Red, 2lm Green, 0.59lm Blue - 24 lm/W Red, 31 lm/W Green, 9 lm/W Blue 25°C 130° 624nm Red, 528nm Green, 470nm Blue - 20mA Red, 20mA Green, 20mA Blue 30mA Red, 20mA Green, 20mA Blue - 8-SMD, No Lead 0.039" (1.00mm) 0.177" L x 0.049" W (4.50mm x 1.25mm) Surface Mount, Right Angle Red, Green, Blue (RGB)
ASMC-QAB2-TAC0E Broadcom Limited LED ENVISIUM AMBER 591NM 4PLCC Sa stock4670 pcs 2.64V Tape & Reel (TR) ASMC-QAB2 7lm (4lm ~ 9lm) 60°C/W 18 lm/W 25°C 120° 591nm (583nm ~ 598nm) Envisium™ 150mA 300mA 4-PLCC 4-PLCC 0.083" (2.10mm) 0.126" L x 0.110" W (3.20mm x 2.80mm) Surface Mount Amber
1
Allelco
Tungkol sa atin
Kasaysayan
Mga sertipikasyon
Recruitment
Mga Patakaran
Mga Tuntunin at Kundisyon
Patakaran sa Pagkapribado
Patakaran sa Cookie
Mga Serbisyo
Pagsubaybay sa order
Bumalik at kapalit
Madalas na nagtanong
Makipag-ugnayan sa amin
Order
Pagpapadala at Paghahatid
Mga Paraan ng Pagbabayad
Aking Account
Ang mga blogMainit na bahagiBaguhin ang wikaBalitaMapa ng Site
Makipag-ugnayan sa amin
Address ng Punong -himpilan:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
Hong Kong
Serbisyo Tel: +852-91464856
Email ng Serbisyo: info@allelco.com
Sundan mo kami
Copyright © 2012-2023 AllelcoElec.com.
Nakalaan ang lahat ng mga karapatan.
0 RFQ
Shopping cart (0 Items)
Wala itong laman.
Isumite ang Inquiry
Ihambing ang listahan (0 Items)
Wala itong laman.
Feedback

Mahalaga ang iyong feedback!Sa Allelco, pinahahalagahan namin ang karanasan ng gumagamit at nagsusumikap upang mapagbuti ito nang palagi.
Mangyaring ibahagi ang iyong mga komento sa amin sa pamamagitan ng aming form ng feedback, at agad kaming tutugon.
Salamat sa pagpili ng Allelco.

Paksa
E-mail
Mga komento
Captcha
I -drag o mag -click upang mag -upload ng file
Mag -upload ng file
Mga Uri: .xls, .xlsx, .doc, .docx, .jpg, .png at .pdf.
MAX SIZE SIZE: 10MB