A vedea tot

Vă rugăm să consultați versiunea în limba engleză ca versiunea noastră oficială.Întoarcere

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)
AcasăProduseCircuite integrate (IC)Linear - Amplificatoare - Instrumentație, amperi OP, amperi tampon

Linear - Amplificatoare - Instrumentație, amperi OP, amperi tampon

Produse 15,274 găsite

Lista de produse

1...103104105106107108109...306
Comparaţie Imagine Parte # Producător Descriere Inventar Modelul ECAD RoHS -3db Bandwidth Pachet Numărul produsului de bază Tensiune - Spațiu de alimentare (Max) Tensiune - Interval de alimentare (min) Tensiune - intrare offset Current - Bias de intrare Găsiți produs de lățime de bandă Rata de coborâre Curent - ieșire / canal Tipul amplificatorului Numărul de circuite Pachetul dispozitivului furnizor Pachet / Caz Tipul de ieșire Tipul de montare Temperatura de Operare Curent - Ofertă Serie Cantitate
LM358PT LM358PT STMicroelectronics IC OPAMP GP 2 CIRCUIT 8TSSOP In stoc199110 pcs - Tape & Reel (TR) LM358 30 V 3 V 2 mV 20 nA 800 kHz 0.6V/µs 30 mA General Purpose 2 8-TSSOP 8-TSSOP (0.173", 4.40mm Width) - Surface Mount 0°C ~ 70°C 700µA (x2 Channels) Automotive, AEC-Q100
TLC2272ACP TLC2272ACP Texas Instruments IC CMOS 2 CIRCUIT 8DIP In stoc14031 pcs - Tube TLC2272 16 V 4.4 V 300 µV 1 pA 2.25 MHz 3.6V/µs 50 mA CMOS 2 8-PDIP 8-DIP (0.300", 7.62mm) Rail-to-Rail Through Hole 0°C ~ 70°C (TA) 2.4mA (x2 Channels) -
TSB572IDT TSB572IDT STMicroelectronics IC OPAMP GP 2 CIRCUIT 8SO In stoc25040 pcs - Tape & Reel (TR) TSB572 36 V 4 V 1.5 mV 8 nA 2.2 MHz 1V/µs 65 mA General Purpose 2 8-SO 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C (TA) 380µA (x2 Channels) Automotive, AEC-Q100
AD8278ARZ-R7 AD8278ARZ-R7 Analog Devices Inc. IC OPAMP DIFF 1 CIRCUIT 8SOIC In stoc23208 pcs - Tape & Reel (TR) AD8278 36 V 2 V 50 µV - 1 MHz 1.4V/µs 15 mA Differential 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 85°C 200µA -
OPA2694ID OPA2694ID Texas Instruments IC OPAMP CFA 2 CIRCUIT 8SOIC In stoc9557 pcs 1.5 GHz Tube OPA2694 12.6 V 7 V 700 µV 5 µA 1.5 kHz 1700V/µs 70 mA Current Feedback 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) Differential Surface Mount -40°C ~ 85°C 11.6mA (x2 Channels) -
TLV2316QDGKRQ1 TLV2316QDGKRQ1 Texas Instruments IC CMOS 2 CIRCUIT 8VSSOP In stoc51900 pcs - Tape & Reel (TR) TLV2316 5.5 V 1.8 V 750 µV 10 pA 10 MHz 6V/µs 50 mA CMOS 2 8-VSSOP 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C 400µA (x2 Channels) Automotive, AEC-Q100
TL072CDT TL072CDT STMicroelectronics IC OPAMP JFET 2 CIRCUIT 8SOIC In stoc136980 pcs - Tape & Reel (TR) TL072 36 V 6 V 3 mV 20 pA 4 MHz 16V/µs 40 mA J-FET 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount 0°C ~ 70°C 1.4mA Automotive, AEC-Q100
LM321MF LM321MF Texas Instruments IC OPAMP GP 1 CIRCUIT SOT23-5 In stoc47260 pcs - Tape & Reel (TR) LM321 30 V 3 V 2 mV 45 nA 1 MHz 0.4V/µs 40 mA General Purpose 1 SOT-23-5 SC-74A, SOT-753 - Surface Mount -40°C ~ 85°C 660µA -
AD8567ACP-REEL AD8567ACP-REEL Analog Devices Inc. IC OPAMP GP R-R 5MHZ 16LFCSP In stoc33464 pcs - Bulk AD8567 16 V 4.5 V 2 mV 80 nA 5 MHz 6V/µs 35 mA General Purpose 4 16-LFCSP (4x4) 16-WQFN Exposed Pad, CSP Rail-to-Rail Surface Mount -40°C ~ 85°C 700µA (x4 Channels) -
LT1014DIDWR LT1014DIDWR Texas Instruments IC OPAMP GP 4 CIRCUIT 16SOIC In stoc10442 pcs - Tape & Reel (TR) LT1014 30 V 4 V 60 µV 12 nA 1 MHz 0.4V/µs 25 mA General Purpose 4 16-SOIC 16-SOIC (0.295", 7.50mm Width) - Surface Mount -40°C ~ 105°C 350µA (x4 Channels) -
AMP04FSZ AMP04FSZ Analog Devices Inc. IC INST AMP 1 CIRCUIT 8SOIC In stoc2742 pcs 700 kHz Tube AMP04 30 V 5 V 30 µV 22 nA - - 30 mA Instrumentation 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 85°C 750µA -
NE5532DR NE5532DR Texas Instruments IC OPAMP GP 2 CIRCUIT 8SOIC In stoc134110 pcs - Tape & Reel (TR) NE5532 30 V 10 V 500 µV 200 nA 10 MHz 9V/µs 38 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount 0°C ~ 70°C (TA) 8mA (x2 Channels) -
ADA4522-1ARZ-RL ADA4522-1ARZ-RL Analog Devices Inc. IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC In stoc21533 pcs - Tape & Reel (TR) ADA4522 55 V 4.5 V 1.5 µV 50 pA 2.7 MHz 1.7V/µs 32 mA Zero-Drift 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C 830µA -
BA4560 BA4560 Rohm Semiconductor IC OPAMP GP 2 CIRCUIT 8DIP In stoc16890 pcs - Tube BA4560 30 V 8 V 500 µV 50 nA 10 MHz 4V/µs 25 mA General Purpose 2 8-DIP 8-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 85°C - -
AD8027ART-REEL7 AD8027ART-REEL7 Analog Devices Inc. IC OPAMP R-R LDIST LN LP SOT23-6 In stoc16930 pcs 190 MHz Cut Tape (CT) AD8027 12 V 2.7 V 200 µV 4 µA - 100V/µs 120 mA Voltage Feedback 1 SOT-23-6 SOT-23-6 Rail-to-Rail Surface Mount -40°C ~ 125°C 6.5mA -
CA3240EZ CA3240EZ Renesas Electronics America Inc IC OPAMP GP 2 CIRCUIT 8DIP In stoc27025 pcs - Tube CA3240 36 V 4 V 5 mV 10 pA 4.5 MHz 9V/µs 40 mA General Purpose 2 8-PDIP 8-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 85°C 8mA (x2 Channels) -
LM358AWDT LM358AWDT STMicroelectronics IC OPAMP GP 2 CIRCUIT 8SOIC In stoc181810 pcs - Tape & Reel (TR) LM358 30 V 3 V 1 mV 20 nA 1.1 MHz 0.6V/µs 40 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount 0°C ~ 70°C 700µA Automotive, AEC-Q100
LMC6064AIN LMC6064AIN Texas Instruments IC CMOS 4 CIRCUIT 14DIP In stoc11650 pcs - Tube LMC6064 15.5 V 4.5 V 100 µV 0.01 pA 100 kHz 0.035V/µs 26 mA CMOS 4 14-PDIP 14-DIP (0.300", 7.62mm) Rail-to-Rail Through Hole -40°C ~ 85°C (TJ) 80µA (x4 Channels) LMC®
TLE2082ID TLE2082ID Texas Instruments IC OPAMP JFET 2 CIRCUIT 8SOIC In stoc10860 pcs - Tube TLE2082 38 V 4.5 V 1.1 mV 20 pA 10 MHz 45V/µs 48 mA J-FET 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 85°C (TA) 3.1mA (x2 Channels) -
ADA4857-1YRZ ADA4857-1YRZ Analog Devices Inc. IC VOLTAGE FEEDBACK 1 CIRC 8SOIC In stoc16411 pcs 850 MHz Tube ADA4857 10.5 V 4.5 V 2 mV 2 µA - 2800V/µs 50 mA Voltage Feedback 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 125°C 5mA -
3656JG 3656JG Texas Instruments IC OPAMP ISOLATION 1 CIRC 20CDIP In stoc16600 pcs 30 kHz Tube 3656 32 V 17 V 2 mV 100 nA - 0.1V/µs 5 mA Isolation 1 20-CDIP 20-CDIP (0.900", 22.86mm) - Through Hole 0°C ~ 70°C 14mA -
LM358N LM358N onsemi IC OPAMP GP 2 CIRCUIT 8DIP In stoc10940 pcs - Tube LM358 32 V 3 V 2 mV 45 nA 700 kHz - 40 mA General Purpose 2 8-PDIP 8-DIP (0.300", 7.62mm) - Through Hole 0°C ~ 70°C 800µA (x2 Channels) -
EL5373IU EL5373IU Renesas Electronics America Inc IC OPAMP DIFF 3 CIRCUIT 24QSOP In stoc5670 pcs 450 MHz Tube EL5373 11 V 4.75 V 3 mV 13 µA - 1100V/µs 55 mA Differential 3 24-QSOP 24-SSOP (0.154", 3.90mm Width) Differential Surface Mount -40°C ~ 85°C 12mA (x3 Channels) EL5373
LTC6256HTS8#TRPBF LTC6256HTS8#TRPBF Analog Devices Inc. IC OPAMP GP 2 CIRCUIT TSOT23-8 In stoc6972 pcs 4.5 MHz Tape & Reel (TR) LTC6256 5.25 V 1.8 V 100 µV 5 nA 6.5 MHz 1.8V/µs 35 mA General Purpose 2 TSOT-23-8 SOT-23-8 Thin, TSOT-23-8 Rail-to-Rail Surface Mount -40°C ~ 125°C 65µA (x2 Channels) -
MC33079N MC33079N STMicroelectronics IC AUDIO 4 CIRCUIT 14DIP In stoc15410 pcs - Tube MC3307 30 V 5 V 2.5 mV 250 nA 15 MHz 7V/µs 37 mA Audio 4 14-DIP 14-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 125°C 8mA Automotive, AEC-Q100
AD641ANZ AD641ANZ Analog Devices Inc. IC LOGARITHMIC 1 CIRCUIT 20DIP In stoc685 pcs 250 MHz Tube AD641 15 V 9 V 50 µV 7 µA - - 2.3 mA Logarithmic 1 20-PDIP 20-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 85°C 35mA -
LT1056S8#TRPBF LT1056S8#TRPBF Analog Devices Inc. IC OPAMP JFET 1 CIRCUIT 8SO In stoc7701 pcs - Tape & Reel (TR) LT1056 36 V 10 V 500 µV 30 pA 5.5 MHz 14V/µs - J-FET 1 8-SO 8-SOIC (0.154", 3.90mm Width) - Surface Mount 0°C ~ 70°C 5mA -
LOG114AIRGVT LOG114AIRGVT Texas Instruments IC LOGARITHMIC 1 CIRCUIT 16VQFN In stoc3103 pcs 5 MHz Tape & Reel (TR) LOG114 11 V 4.8 V 100 µV 5 pA 15 MHz 5V/µs 18 mA Logarithmic 1 16-VQFN (4x4) 16-VQFN Exposed Pad - Surface Mount -5°C ~ 75°C 10mA -
OPA1632DGNR OPA1632DGNR Texas Instruments IC AUDIO 1 CIRCUIT 8HVSSOP In stoc24165 pcs 180 MHz Tape & Reel (TR) OPA1632 32 V 5 V 500 µV 2 µA - 50V/µs 85 mA Audio 1 8-HVSSOP 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad Differential Surface Mount -40°C ~ 85°C 14mA -
MCP6V31T-E/OT MCP6V31T-E/OT Microchip Technology IC OPAMP ZER-DRIFT 1CIRC SOT23-5 In stoc25164 pcs - Tape & Reel (TR) MCP6V31 5.5 V 1.8 V 8 µV 5 pA 300 kHz 0.13V/µs - Zero-Drift 1 SOT-23-5 SC-74A, SOT-753 Rail-to-Rail Surface Mount -40°C ~ 125°C 23µA -
LT6200CS8#PBF LT6200CS8#PBF Analog Devices Inc. IC OPAMP GP 1 CIRCUIT 8SO In stoc13467 pcs - Tube LT6200 12.6 V 2.5 V 2.5 mV 23 µA 165 MHz 50V/µs - General Purpose 1 8-SO 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount 0°C ~ 70°C 20mA -
OPA4374AIDR OPA4374AIDR Texas Instruments IC CMOS 4 CIRCUIT 14SOIC In stoc37343 pcs - Tape & Reel (TR) OPA4374 5.5 V 2.7 V 1 mV 0.5 pA 6.5 MHz 5V/µs 5 mA CMOS 4 14-SOIC 14-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C 585µA (x4 Channels) -
MCP6272T-E/SN MCP6272T-E/SN Microchip Technology IC OPAMP GP 2 CIRCUIT 8SOIC In stoc74140 pcs - Tape & Reel (TR) MCP6272 6 V 2 V 3 mV 1 pA 2 MHz 0.9V/µs 25 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C (TA) 170µA (x2 Channels) -
LT1991CDD#PBF LT1991CDD#PBF Analog Devices Inc. IC OPAMP PGA 1 CIRCUIT 10DFN In stoc13355 pcs 110 kHz Tube LT1991 36 V 2.7 V 25 µV 2.5 nA 560 kHz 0.12V/µs 21 mA Programmable Gain 1 10-DFN (3x3) 10-WFDFN Exposed Pad Rail-to-Rail Surface Mount 0°C ~ 70°C 130µA -
LM2904P LM2904P Texas Instruments IC OPAMP GP 2 CIRCUIT 8DIP In stoc289460 pcs - Tube LM2904 26 V 3 V 3 mV 20 nA 700 kHz 0.3V/µs 40 mA General Purpose 2 8-PDIP 8-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 125°C (TA) 500µA (x2 Channels) -
ISL28213FUZ ISL28213FUZ Renesas Electronics America Inc IC OPAMP GP 2 CIRCUIT 8MSOP In stoc102520 pcs - Tube ISL28213 5.5 V 1.8 V 500 µV 3 pA 2 MHz 1V/µs 22 mA General Purpose 2 8-MSOP 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C 90µA (x2 Channels) -
AD783JRZ AD783JRZ Analog Devices Inc. IC SAMPL/HOLD 1 CIRCUIT 8SOIC In stoc1153 pcs 15 MHz Tube AD783 10.5 V 9.5 V - 100 nA - - 5 mA Sample and Hold 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount 0°C ~ 70°C 9.5mA -
MC33172DR2 MC33172DR2 onsemi IC OPAMP DUAL LOW POWER 8SOIC In stoc13240 pcs - Tape & Reel (TR) MC33172 44 V 3 V 2 mV 20 nA 1.8 MHz 2.1V/µs 27 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 85°C 220µA (x2 Channels) -
RC4558DR RC4558DR Texas Instruments IC OPAMP GP 2 CIRCUIT 8SOIC In stoc240140 pcs - Tape & Reel (TR) RC4558 30 V 10 V 500 µV 150 nA 3 MHz 1.7V/µs 10 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) Differential Surface Mount 0°C ~ 70°C 2.5mA (x2 Channels) -
TLE2021MDREP TLE2021MDREP Texas Instruments IC OPAMP GP 1 CIRCUIT 8SOIC In stoc18806 pcs - Tape & Reel (TR) TLE2021 40 V 4 V 120 µV 25 nA 2 MHz 0.65V/µs 20 mA General Purpose 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -55°C ~ 125°C 200µA Excalibur™
MC1458IDT MC1458IDT STMicroelectronics IC OPAMP GP 2 CIRCUIT 8SOIC In stoc82700 pcs - Tape & Reel (TR) MC1458 30 V 5 V 1 mV 30 nA 1 MHz 0.8V/µs 25 mA General Purpose 2 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 105°C 2.3mA -
LT1990IS8#PBF LT1990IS8#PBF Analog Devices Inc. IC OPAMP DIFF 1 CIRCUIT 8SO In stoc13655 pcs 105 kHz Tube LT1990 36 V 2.7 V 900 µV - - 0.55V/µs 22 mA Differential 1 8-SO 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 85°C 140µA -
AD8641AKSZ-REEL7 AD8641AKSZ-REEL7 Analog Devices Inc. IC OPAMP JFET 1 CIRCUIT SC70-5 In stoc17694 pcs - Tape & Reel (TR) AD8641 26 V 5 V 70 µV 0.25 pA 3.5 MHz 3V/µs 12 mA J-FET 1 SC-70-5 5-TSSOP, SC-70-5, SOT-353 Rail-to-Rail Surface Mount -40°C ~ 125°C 200µA -
MCP661-E/SN MCP661-E/SN Microchip Technology IC OPAMP GP 1 CIRCUIT 8SOIC In stoc47200 pcs - Tube MCP661 5.5 V 2.5 V 1.8 mV 6 pA 60 MHz 32V/µs - General Purpose 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 125°C 6mA -
LT1631CS#PBF LT1631CS#PBF Analog Devices Inc. IC OPAMP GP 4 CIRCUIT 14SO In stoc3544 pcs - Tube LT1631 36 V 2.7 V 220 µV 550 nA 30 MHz 10V/µs 70 mA General Purpose 4 14-SO 14-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount -40°C ~ 85°C 4.1mA (x4 Channels) LT®
INA126U/2K5 INA126U/2K5 Texas Instruments IC INST AMP 1 CIRCUIT 8SOIC In stoc18539 pcs 200 kHz Tape & Reel (TR) INA126 36 V 2.7 V 100 µV 10 nA - 0.4V/µs 10 mA Instrumentation 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) - Surface Mount -40°C ~ 85°C 175µA -
INA217AIP INA217AIP Texas Instruments IC INST AMP 1 CIRCUIT 8DIP In stoc13350 pcs 3.4 MHz Tube INA217 36 V 9 V 50 µV 2 µA - 15V/µs 60 mA Instrumentation 1 8-PDIP 8-DIP (0.300", 7.62mm) - Through Hole -40°C ~ 85°C 10mA -
TLV2461CDR TLV2461CDR Texas Instruments IC OPAMP GP 1 CIRCUIT 8SOIC In stoc39040 pcs - Tape & Reel (TR) TLV2461 6 V 2.7 V 500 µV 1.3 nA 6.4 MHz 1.6V/µs 80 mA General Purpose 1 8-SOIC 8-SOIC (0.154", 3.90mm Width) Rail-to-Rail Surface Mount 0°C ~ 70°C 550µA -
MAX4128EUA+ MAX4128EUA+ Analog Devices Inc./Maxim Integrated IC OPAMP GP 2 CIRCUIT 8UMAX In stoc10156 pcs - Tube MAX4128 6.5 V 2.7 V 400 µV 50 nA 25 MHz 10V/µs 50 mA General Purpose 2 8-uMAX/uSOP 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Rail-to-Rail Surface Mount -40°C ~ 85°C 725µA (x2 Channels) -
ADA4841-2YCPZ-R7 ADA4841-2YCPZ-R7 Analog Devices Inc. IC OPAMP GP 2 CIRCUIT 8LFCSP In stoc6796 pcs 80 MHz Tape & Reel (TR) ADA4841 12 V 2.7 V 40 µV 3 µA - 13V/µs 60 mA General Purpose 2 8-LFCSP-WD (3x3) 8-WFDFN Exposed Pad, CSP Rail-to-Rail Surface Mount -40°C ~ 125°C 1.2mA (x2 Channels) -
1...103104105106107108109...306
0 RFQ
Cărucior de cumpărături (0 Items)
Este gol.
Comparați lista (0 Items)
Este gol.
Părere

Feedback -ul dvs. contează!La Allelco, apreciem experiența utilizatorului și ne străduim să o îmbunătățim constant.
Vă rugăm să împărtășiți comentariile dvs. cu noi prin formularul nostru de feedback și vom răspunde prompt.
Vă mulțumim că ați ales Allelco.

Subiect
E-mail
Comentarii
Captcha
Trageți sau faceți clic pentru a încărca fișierul
Incarca fisier
Tipuri: .xls, .xlsx, .doc, .docx, .jpg, .png și .pdf.
MAX DIEMENTUL FILE: 10MB