Tentang kita Hubungi kami Hantar bom
RFQs(0)
Melayu
Tutup menu
Lihat semua

Sila rujuk versi bahasa Inggeris sebagai versi rasmi kami.Kembali

Eropah
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)
Asia Pasifik
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Afrika, India dan Timur Tengah
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
Amerika Selatan / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
Amerika Utara
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
RumahProdukLitar Bersepadu (IC)PMIC - Motor Pemandu, Pengawal

PMIC - Motor Pemandu, Pengawal

Produk 1,929 dijumpai

Senarai produk

1...2930313233343539
Bandingkan Gambar Bahagian # Pengeluar Penerangan Inventori Model ECAD RoHS Resolusi langkah fungsi Semasa - Output Konfigurasi output Voltan - Beban Motor Jenis - Stepper Motor jenis - AC, DC Voltan - Bekalan pembungkusan Nombor Bahagian Asas Status Status Percuma / Rosh Status Tahap Sensitiviti Lembapan (MSL) Nombor produk asas Pakej Pengilang Standard Lead Time Penerangan terperinci Siri Teknologi Suhu Operasi pemasangan Jenis antara muka aplikasi Pakej / Kes Pembekal Peranti Pakej Kuantiti
DRV8876PWPT Texas Instruments IC MOTOR DRIVER DC 5.5V 16HTSSOP Dalam stok29167 pcs - Driver - Fully Integrated, Control and Power Stage 3.5A Half Bridge (2) 4.5V ~ 37V Unipolar Brushed DC 0V ~ 5.5V - - - - DRV8876 Tape & Reel (TR) - - - NMOS -40°C ~ 125°C (TA) Surface Mount PWM DC Motors, General Purpose, Stepper Motors 16-PowerTSSOP (0.173", 4.40mm Width) 16-HTSSOP
DRV8305NEPHPRQ1 Texas Instruments IC MTR DRV MULTI 4.4-45V 48HTQFP Dalam stok9052 pcs - Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (3) - Multiphase - 4.4V ~ 45V - - - - DRV8305 Tape & Reel (TR) - - Automotive, AEC-Q100 Power MOSFET -40°C ~ 125°C (TA) Surface Mount PWM, SPI Three-Phase BLDC, PMSM Motors 48-PowerTQFP 48-HTQFP (7x7)
IR2238Q Infineon Technologies IC MOTOR DRIVER 12.5V-20V 64MQFP Dalam stok12020 pcs - Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (3) - - AC, Synchronous 12.5V ~ 20V - - - - IR2238 Tray - - - IGBT -20°C ~ 115°C (TA) Surface Mount Parallel General Purpose 64-BQFP 64-MQFP (20x14)
BD6425EFV-E2 Rohm Semiconductor IC MTR DRV BIPLR 19-42V 28HTSSOP Dalam stok7062 pcs 1, 1/2, 1/4 Driver - Fully Integrated, Control and Power Stage 1.2A Half Bridge (4) 19V ~ 42V Bipolar - 19V ~ 42V - - - - BD6425 Tape & Reel (TR) - - - DMOS -25°C ~ 150°C (TJ) Surface Mount Analog, PWM General Purpose 28-VSSOP (0.173", 4.40mm Width) Exposed Pad 28-HTSSOP-B
DRV10963LADSNR Texas Instruments PROTOTYPE Dalam stok10610 pcs - Driver - Fully Integrated, Control and Power Stage 500mA Half Bridge (3) 7V Multiphase Brushless DC (BLDC) 2.1V ~ 5.5V - - - - - Bulk - - - Power MOSFET -40°C ~ 125°C (TJ) Surface Mount - Fan Motor Driver 10-UFDFN Exposed Pad 10-SON (3x3)
BD8226EFV-E2 Rohm Semiconductor IC MOTOR DRVR 5.5V-14V 24HTSSOP Dalam stok33649 pcs - Driver - Fully Integrated, Control and Power Stage - Half Bridge (8) 5.5V ~ 14V - Brushed DC 5.5V ~ 14V - - - - BD8226 Tape & Reel (TR) - - - - -40°C ~ 85°C Surface Mount Parallel General Purpose 24-VSSOP (0.220", 5.60mm Width) Exposed Pad 24-HTSSOP-B
A4945GLTR-T Allegro MicroSystems IC FAN DRIVER BLDC SOT89-3 Dalam stok35571 pcs - Fan Control 1.8A Half Bridge (3) - Multiphase Brushless DC (BLDC) 4V ~ 18V - - - - A4945 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 105°C (TA) - Analog Fan Motor Driver - -
SPI-7210M Sanken 2-PHASE STEPPER MOTOR BIPOLAR DR Dalam stok15660 pcs - Driver - Fully Integrated, Control and Power Stage 1A Half Bridge (4) 8V ~ 30V Bipolar - 3V ~ 5.5V - - - - - Tape & Reel (TR) - - - Bipolar, NMOS - Surface Mount - General Purpose 16-SOIC (0.295", 7.50mm Width) Exposed Pad 16-HSOP
BD7964FS-E2 LAPIS Semiconductor IC MOTOR DRIVER PAR 5CH Dalam stok7664 pcs - - - - - - - - Tape & Reel (TR) BD7964 Lead free / RoHS Compliant 1 (Unlimited) - - 10 Weeks IC MOTOR DRIVER PAR 5CH - - - - - - - -
BA5912BFP-E2 Rohm Semiconductor IC MOTOR DRIVER 4.5-13.2V HSOP25 Dalam stok7660 pcs - Driver - Fully Integrated, Control and Power Stage - Half Bridge (2) 4.5V ~ 13.2V - Brushed DC 4.5V ~ 13.2V - - - - BA5912 Tape & Reel (TR) - - - - -40°C ~ 85°C (TA) - Parallel General Purpose - -
DRV3201AQPAPRQ1 Texas Instruments PROTOTYPE Dalam stok11710 pcs - Controller - Commutation, Direction Management 1A Pre-Driver - Half Bridge (3) 4.75V ~ 30V Multiphase Brushless DC (BLDC) 4.75V ~ 30V - - - - - Bulk - - Automotive, AEC-Q100 Power MOSFET -40°C ~ 125°C (TA) Surface Mount SPI Automotive 64-PowerTQFP 64-HTQFP (10x10)
LB11961RM-TLM3-E onsemi IC MOTOR DRIVER 4.5V-16V MFP14S Dalam stok5060 pcs - Driver - Fully Integrated, Control and Power Stage 1A Half Bridge (2) 4.5V ~ 16V - Brushed DC 4.5V ~ 16V - - - - LB11961 Tape & Reel (TR) - - - Bipolar -30°C ~ 90°C (TA) - Parallel Fan Motor Driver - -
DRV8848PWPR Texas Instruments IC MTR DRV BIPOLR 4-18V 16HTSSOP Dalam stok41224 pcs - Driver - Fully Integrated, Control and Power Stage 4A Half Bridge (4) 4V ~ 18V Bipolar Brushed DC 4V ~ 18V - - - - DRV8848 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 150°C (TJ) Surface Mount PWM DC Motors, General Purpose 16-PowerTSSOP (0.173', 4.40mm Width) 16-HTSSOP
A3938SLDTR-T Allegro MicroSystems IC MOTOR DRIVER 18V-50V 38TSSOP Dalam stok6689 pcs - Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (3) - - Brushless DC (BLDC) 18V ~ 50V - - - - A3938 Tape & Reel (TR) - - - Power MOSFET -20°C ~ 85°C (TA) Surface Mount Parallel, PWM General Purpose 38-TFSOP (0.173', 4.40mm Width) 38-TSSOP
SPF7211 Sanken 2-PHASE STEPPER MOTOR DRIVER IC Dalam stok10000 pcs - Driver - Fully Integrated, Control and Power Stage 800mA - 6V ~ 18V Bipolar Brushed DC 6V ~ 18V - - - - - Bulk - - - - -40°C ~ 110°C Surface Mount - General Purpose 24-PowerSOIC (0.295", 7.50mm Width) 24-HSOP
NJM3771E3-TE2 Nisshinbo Micro Devices Inc. IC STEPPER MOTOR DRIVER 20EMP Dalam stok13510 pcs 1, 1/2 Driver - Fully Integrated, Control and Power Stage 650mA Half Bridge (4) 10V ~ 40V Bipolar - 4.75V ~ 5.25V - - - - NJM3771 Tape & Reel (TR) - - - Bipolar -20°C ~ 125°C (TJ) Surface Mount Parallel General Purpose 24-SOIC (0.295", 7.50mm Width) 24-SOP
BTS7810K Infineon Technologies BUFFER/INVERTER PERIPHL DRIVER Dalam stok8510 pcs - Driver - Fully Integrated, Control and Power Stage - Half Bridge (2) - Bipolar Brushless DC (BLDC) 1.8V ~ 42V - - - - BTS7810 Bulk - - - DMOS -40°C ~ 150°C (TJ) Surface Mount - General Purpose TO-263-18 (15 Leads + 3 Tabs) P-TO263-15-1
TMC2208-LA Analog Devices Inc./Maxim Integrated STEPPER MOTOR DRIVER IC, STEP/DI Dalam stok19166 pcs 1 ~ 1/256 Driver - Fully Integrated, Control and Power Stage 1.2A Half Bridge (2) 5.5V ~ 36V Bipolar Brushed DC 5.5V ~ 36V - - - - - Tray - - StealthChop™ Power MOSFET -40°C ~ 125°C (TJ) Surface Mount SPI, Step/Direction, UART General Purpose 28-VFQFN Exposed Pad 28-QFN (5x5)
SX7236M Sanken 2-PHASE STEPPER MOTOR BIPOLAR DR Dalam stok6510 pcs - Driver - Fully Integrated, Control and Power Stage - Half Bridge (4) - Bipolar - 60V - - - - - Tape & Reel (TR) - - SX723xM NMOS - Surface Mount - - 36-SOP (0.449", 11.40mm Width), 32 Leads 36-SOP
BA7660F-E2 Rohm Semiconductor IC DRIVER 3CH 75 OHM SSOP Dalam stok3830 pcs - - - - - - - - - - - - BA7660 Tape & Reel (TR) - - - - - - - - - -
LV8133JA-AH onsemi IC MOTOR PRE-DRIVER Dalam stok5720 pcs - - - - - - - - - - - - LV8133 Tape & Reel (TR) - - - - - - - - - -
LB11850VA-W-AH onsemi IC MOTOR CONTROLLER 24SSOP Dalam stok16610 pcs - - - - - - - - - - - - LB11850 Tape & Reel (TR) - - * - - - - - - -
TPIC2040DBTRG4 Texas Instruments IC MOTOR DRIVER 3V-3.6V 38TSSOP Dalam stok15160 pcs - Driver - Fully Integrated, Control and Power Stage 1A Half Bridge (15) 4.5V ~ 5.5V - Brushless DC (BLDC), Brushed DC 3V ~ 3.6V - - - - TPIC2040 Tape & Reel (TR) - - - Power MOSFET -20°C ~ 75°C (TA) Surface Mount SPI Media Player 38-TFSOP (0.173", 4.40mm Width) 38-TSSOP
BA5946FP-E2 Rohm Semiconductor IC MOTOR DRIVER Dalam stok9560 pcs - - - - - - - - - - - - BA5946 Tape & Reel (TR) - - - - - - - - - -
TMC4361A-LA Analog Devices Inc./Maxim Integrated STEPPER MOTOR SERVO CONTROLLER I Dalam stok3485 pcs - Controller - Commutation, Direction Management - SPI, Step/Direction - - - - - - - - - Tray - - - CMOS -40°C ~ 125°C (TA) Surface Mount SPI, Step/Direction General Purpose 40-VFQFN Exposed Pad 40-QFN (6x6)
STK625-711B-E onsemi IC MOTOR DRIVER Dalam stok6830 pcs - - - - - - - - - - - - STK625 Tube - - - - - - - - - -
SIM6811M Sanken IPM - HIGH VOLTAGE 3 PHASE MOTOR Dalam stok4454 pcs - Driver - Fully Integrated, Control and Power Stage 2A Half Bridge (3) 400V Multiphase Brushless DC (BLDC) 13.5V ~ 16.5V - - - - - Tube - - SIM6800M NMOS -30°C ~ 100°C Through Hole Parallel Fan Motor Driver 40-PowerDIP Module 40-DIP Module
STK6713BMK4-C-E onsemi IC MOTOR DRIVER UNIPOLAR 16SIP Dalam stok16330 pcs 1, 1/2 Driver - Fully Integrated, Control and Power Stage 3A Half Bridge (2) 18V ~ 42V Unipolar - 4.75V ~ 5.25V - - - - STK671 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 150°C (TJ) Through Hole Parallel General Purpose 16-SIP 16-SIP
BH6565FV-E2 Rohm Semiconductor IC PWM DRIVER FOR CD Dalam stok5180 pcs - - - - - - - - - - - - BH6565 Tape & Reel (TR) - - - - - - - - - -
LC898105-TBM-GB-E onsemi IC MOTOR DRIVER STEPPING 64QFP Dalam stok17600 pcs - - - - - - - - - - - - LC898105 Tape & Reel (TR) - - - - - - - - - -
DRV83053PHPR Texas Instruments IC MTR DRV MULTI 4.4-45V 48HTQFP Dalam stok8093 pcs - Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (3) - Multiphase - 4.4V ~ 45V - - - - DRV8305 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 125°C (TA) Surface Mount PWM, SPI Three-Phase BLDC, PMSM Motors 48-PowerTQFP 48-HTQFP (7x7)
DRV10983LFPWPR Texas Instruments PROTOTYPE Dalam stok14810 pcs - Driver - Fully Integrated, Control and Power Stage 3A Half Bridge (3) 8V ~ 28V Multiphase Brushless DC (BLDC) 8V ~ 28V - - - - - Bulk - - - Power MOSFET -40°C ~ 125°C (TJ) Surface Mount I²C Fan Motor Driver 24-PowerTSSOP (0.173", 4.40mm Width) 24-HTSSOP
LC898201TA-NH onsemi IC MTR DRV BIPLR 2.7-3.6V 64TQFP Dalam stok5578 pcs - Driver - Fully Integrated, Control and Power Stage 200mA, 300mA Half Bridge (14) 2.7V ~ 5.5V Bipolar Brushed DC, Voice Coil Motor 2.7V ~ 3.6V - - - - LC898201 Tape & Reel (TR) - - - CMOS -20°C ~ 85°C (TA) Surface Mount SPI Camera 64-TQFP 64-TQFP (7x7)
PT8A9963SE Diodes Incorporated IC MOTOR DRIVER 3.3V-6V Dalam stok5410 pcs - Controller - Commutation, Direction Management - - - - - 3.3V ~ 6V - - - - PT8A9963 Bulk - - - CMOS 0°C ~ 70°C (TA) Through Hole - - 20-DIP (0.300', 7.62mm) 20-PDIP
LV8711T-TLM-H onsemi IC MTR DRV BIPLR 2.7-5.5V 24SSOP Dalam stok6980 pcs - Driver - Fully Integrated, Control and Power Stage 800mA Half Bridge (4) 4V ~ 16V Bipolar - 2.7V ~ 5.5V - - - - LV8711 Tape & Reel (TR) - - - Bi-CMOS -20°C ~ 85°C (TA) Surface Mount Parallel General Purpose 24-TFSOP (0.173', 4.40mm Width) 24-TSSOP
SLA7031M Sanken IC MTR DRV UNIPOLAR 10-44V 18ZIP Dalam stok3990 pcs 1, 1/2 Driver - Fully Integrated, Control and Power Stage 1A Half Bridge (2) 10V ~ 44V Unipolar - 10V ~ 44V - - - - SLA7031 Tube - - - Power MOSFET -20°C ~ 150°C (TJ) Through Hole Parallel General Purpose 18-SSIP Formed Leads 18-ZIP
LB11851FA-BH onsemi IC MOTOR DRIVER 6V-16V 10MICRO Dalam stok6050 pcs - Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (2) - - Brushed DC 6V ~ 16V - - - - LB11851 Tape & Reel (TR) - - - - -40°C ~ 90°C (TA) Surface Mount PWM Fan Controller 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 10-Micro
A5931GLPTR-T Allegro MicroSystems SENSORLESS SINUSOIDAL FAN DRIVER Dalam stok18696 pcs - Driver - Fully Integrated, Control and Power Stage 3A Half Bridge (3) - Multiphase Brushless DC (BLDC) 5V ~ 16V - - - - A5931 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 105°C (TA) Surface Mount Analog, I²C, PWM Fan Motor Driver 16-TSSOP (0.173', 4.40mm Width) Exposed Pad 16-eTSSOP-EP
NJU39612E2 Nisshinbo Micro Devices Inc. IC MOTOR DRIVER SMD Dalam stok15610 pcs >256 Microsteps Controller - Commutation, Direction Management - Pre-Driver - Half Bridge (2) - Bipolar - 4.75V ~ 5.25V - - - - NJU39612 Tray - - - - -20°C ~ 85°C (TA) Surface Mount Parallel General Purpose 20-SOIC (0.295", 7.50mm Width) EMP20-E2
A5989GEVTR-T Allegro MicroSystems IC MOTOR DRIVER BIPOLAR 8V-40V Dalam stok14527 pcs 1, 1/2, 1/4 Driver - Fully Integrated, Control and Power Stage 1.6A, 3.2A Half Bridge (6) 8V ~ 40V Bipolar Brushed DC 8V ~ 40V - - - - A5989 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 150°C (TJ) Surface Mount Parallel General Purpose 36-VFQFN Exposed Pad 36-QFN-EP (6x6)
LB1991V-TLM-E onsemi IC MOTOR DRIVER 24SSOP Dalam stok8190 pcs - - - - - - - - - - - - LB1991 Tape & Reel (TR) - - - - - Surface Mount - - 24-LSSOP (0.220', 5.60mm Width) 24-SSOP
TMC2660-PA Trinamic Motion Control GmbH IC MTR DRV BIPOLAR 3.3-5V 44PQFP Dalam stok14000 pcs 1 ~ 1/256 Driver - Fully Integrated, Control and Power Stage 2.8A Half Bridge (4) 9V ~ 30V Bipolar - 3.3V ~ 5V - - - - TMC2660 Tray - - stallGuard2™ Power MOSFET -40°C ~ 125°C (TJ) Surface Mount SPI, Step/Direction General Purpose 44-LQFP 44-PQFP (10x10)
SMA7077MR Sanken IC MOTOR DRIVER SMD Dalam stok11030 pcs - - - - - - - - - - - - SMA7077 Tube - - - - - - - - - -
LV8414CS-TE-L-H onsemi IC MTR DRV BIPLR 2.5-5.5V 32WLPJ Dalam stok8220 pcs 1, 1/2, 1/256 Driver - Fully Integrated, Control and Power Stage 400mA Half Bridge (8) 2.5V ~ 5.5V Bipolar - 2.5V ~ 5.5V - - - - LV8414 Tape & Reel (TR) - - - Bi-CMOS -30°C ~ 85°C (TA) Surface Mount I²C Camera 32-UFBGA, WLBGA 32-WLPJ (2.47x2.47)
A5943GLPTR-T Allegro MicroSystems IC MOTOR DRIVER 16TSSOP Dalam stok29557 pcs - Driver - Fully Integrated, Control and Power Stage - Half Bridge (3) - - Brushless DC (BLDC) - - - - - A5943 Tape & Reel (TR) - - - Power MOSFET -40°C ~ 105°C (TA) Surface Mount Logic Automotive 16-TSSOP (0.173', 4.40mm Width) Exposed Pad 16-eTSSOP-EP
PS8A0132SWEX Diodes Incorporated CERAMIC HEATING CONTROLLER Dalam stok14260 pcs - - - - - - - - - - - - PS8A0132 Tape & Reel (TR) - - - - - - - - - -
LA6565VR-TLM-E onsemi IC MOTOR DRIVER 44SSOP Dalam stok16780 pcs - - - - - - - - - - - - LA6565 Tape & Reel (TR) - - - - - Surface Mount - - 44-LSSOP (0.220', 5.60mm Width) Exposed Pad 44-SSOP
MPQ6526GU-AEC1-Z Monolithic Power Systems Inc. IC MOTOR DRIVER 7V-28V 24QFN Dalam stok16839 pcs - Driver 900mA Half Bridge (6) - - - 7V ~ 28V - - - - MPQ6526 Tape & Reel (TR) - - Automotive, AEC-Q100 DMOS -40°C ~ 150°C (TJ) Surface Mount Serial Industrial 24-VFQFN Exposed Pad 24-QFN (5x5)
EMC4000-FZG-TR Microchip Technology IC FAN CONTROLLER Dalam stok12820 pcs - - - - - - - - - - - - EMC4000 Tape & Reel (TR) - - * - - - - - - -
TMC5160A-TA Analog Devices Inc./Maxim Integrated STEPPER MOTOR CONTROLLER/DRIVER Dalam stok6604 pcs 1 ~ 1/256 Driver - Fully Integrated, Control and Power Stage 20A Half Bridge (4) 10V ~ 55V Bipolar - 10V ~ 50V - - - - - Tray - - - BCD MOS External Power MOSFETs -40°C ~ 125°C (TJ) Surface Mount SPI, Step/Direction Automation Control, Industrial, Medical 48-TQFP Exposed Pad 48-TQFP-EP (7x7)
1...2930313233343539
Allelco
Tentang kita
Sejarah
Pensijilan
Pengambilan
Dasar
Terma & Syarat
Dasar Privasi
Dasar Cookie
Perkhidmatan
Pesan Pesan
Kembali & penggantian
Soalan yang sering ditanya
Hubungi kami
Pesanan
Penghantaran & Penghantaran
cara bayaran
Akaun saya
BlogBahagian panasTukar bahasaBeritaPeta tapak
Hubungi kami
Alamat Ibu Pejabat:
Bilik C 13/F Harvard Bangunan Komersial
105-111 Thomson Road Wan Chai
Hongkong
Perkhidmatan tel: +852-91464856
E -mel perkhidmatan: info@allelco.com
Ikut kami
Hak Cipta © 2012-2023 AllelcoElec.com.
Hak cipta terpelihara.
0 RFQ
Bakul membeli belah (0 Items)
Ia kosong.
Hantar Pertanyaan
Bandingkan senarai (0 Items)
Ia kosong.
Maklum balas

Maklum balas anda penting!Di Allelco, kami menghargai pengalaman pengguna dan berusaha untuk memperbaikinya secara berterusan.
Sila kongsi komen anda dengan kami melalui borang maklum balas kami, dan kami akan bertindak balas dengan segera.
Terima kasih kerana memilih Allelco.

Subjek
E-mel
Komen
Captcha
Seret atau klik untuk memuat naik fail
Muat naik fail
Jenis: .xls, .xlsx, .doc, .docx, .jpg, .png dan .pdf.
Max Saiz Fail: 10MB