Виж всички

Моля, вижте английската версия като нашата официална версия.Връщане

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)
У домаПродуктиСензори, преобразувателиТемпературни сензори - термостати - твърдо състояние

Температурни сензори - термостати - твърдо състояние

Намерени продукти 270

Списък с продукти

123456
сравнение Изображение Част # Производител описание Складова наличност ECAD модел RoHS продукция Пакет Основен номер на продукта Избираема хистерезис Температура на температурата на пътуването Температура на превключване Ток - изход (макс.) точност Изходна функция серия Напрежение - Доставка Пакет на доставчик на устройства Пакет / касета Характеристика Тип на изхода Тип монтаж Работна температура Ток - Доставка количество
LTC2996CDD#TRPBF LTC2996CDD#TRPBF Analog Devices Inc. THERMOSTAT 20/70DEG OPN DR 10DFN В наличност11765 pcs Active High, Active Low Tape & Reel (TR) LTC2996 No Cold, Hot -20°C, 70°C - ±2°C /OverTemp, /UnderTemp - 2.25 V ~ 5.5 V 10-DFN (3x3) 10-WFDFN Exposed Pad Utilizes External Sensor Open Drain Surface Mount 0°C ~ 70°C 200µA
TMP01FPZ TMP01FPZ Analog Devices Inc. THERMOSTAT PROG ACTIVE HIGH 8DIP В наличност4014 pcs Active High Tube TMP01 Yes Cold, Hot Programmable 50mA ±1°C /OverTemp, /UnderTemp - 4.5 V ~ 13.2 V 8-PDIP 8-DIP (0.300', 7.62mm) - Open Collector Through Hole -55°C ~ 125°C 500µA
TMP300AIDCKR TMP300AIDCKR Texas Instruments THERMOSTAT PROG ACTIVE LO SC70-6 В наличност4012 pcs Active Low Tape & Reel (TR) TMP300 Yes Hot Programmable - ±4°C /OverTemp, VTemp - 1.8 V ~ 18 V SC-70-6 6-TSSOP, SC-88, SOT-363 Trip Test Open Drain Surface Mount -40°C ~ 150°C 110µA
MAX6665ASA50 MAX6665ASA50 Analog Devices Inc./Maxim Integrated FAN CONTROLLER В наличност12892 pcs Active High, Active Low Bulk - Yes Hot 50°C 250mA ±3°C FanOn, /FanOut, /OverTemp, /Warn - 2.7 V ~ 5.5 V 8-SOIC-EP 8-SOIC (0.154", 3.90mm Width) Exposed Pad - Open Drain, Push-Pull Surface Mount -40°C ~ 125°C 65µA
BDE0900G-TR BDE0900G-TR Rohm Semiconductor THERMOSTAT 90DEGC ACT LOW 5SSOP В наличност55920 pcs Active Low Tape & Reel (TR) BDE0900 No Hot 90°C 5mA ±4°C /OverTemp, VTemp - 2.9 V ~ 5.5 V 5-SSOP SC-74A, SOT-753 - Open Drain Surface Mount -30°C ~ 130°C 16µA
LM26CIM5X-NPA LM26CIM5X-NPA Texas Instruments THERMOSTAT 45DEGC ACT LO SOT23-5 В наличност4350 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 45°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
MAX6505UTP085+T MAX6505UTP085+T Analog Devices Inc./Maxim Integrated THERMOSTAT 85DEGC ACT LO SOT23-6 В наличност29778 pcs Active Low Tape & Reel (TR) MAX6505 No Hot 85°C 20mA ±3.5°C /OverTemp, /Warn - 2.5 V ~ 5.5 V SOT-6 SOT-23-6 Delta Select Inputs Open Drain Surface Mount -40°C ~ 125°C 40µA
BDE1100G-TR BDE1100G-TR Rohm Semiconductor THERMOSTAT 110DEGC ACT LOW 5SSOP В наличност20069 pcs Active Low Tape & Reel (TR) BDE1100 No Hot 110°C 5mA ±4°C /OverTemp, VTemp - 2.9 V ~ 5.5 V 5-SSOP SC-74A, SOT-753 - Open Drain Surface Mount -30°C ~ 130°C 16µA
S-5844A85AB-A4T2U3 S-5844A85AB-A4T2U3 ABLIC Inc. THERMOSTAT OPEN DRAIN HSNT4-B В наличност89900 pcs - Tape & Reel (TR) S-5844 No - - 10mA ±2.5°C /OverTemp S-5844A 1.65 V ~ 5.5 V HSNT-4-B 4-SMD, Flat Lead Exposed Pad - Open Drain Surface Mount -40°C ~ 125°C 180nA
LM57FPWR LM57FPWR Texas Instruments THERMOSTAT PROG ACT HI/LO 8TSSOP В наличност32124 pcs Active High, Active Low Tape & Reel (TR) LM57 No Hot Programmable 5mA ±2.3°C OverTemp, /OverTemp Automotive, AEC-Q100 2.4 V ~ 5.5 V 8-TSSOP 8-TSSOP (0.173', 4.40mm Width) Selectable Trip Point, Trip Test Open Drain, Push-Pull Surface Mount -50°C ~ 150°C 24µA
TMP708AIDBVT TMP708AIDBVT Texas Instruments THERMOSTAT PROG ACT LOW SOT23-5 В наличност63830 pcs Active Low Tape & Reel (TR) TMP708 Yes Hot Programmable 20mA ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 40µA
BDJ0600HFV-TR BDJ0600HFV-TR Rohm Semiconductor THERMOSTAT 60DEGC ACT LOW HVSOF5 В наличност50480 pcs Active Low Tape & Reel (TR) BDJ0600 No Hot 60°C 5mA ±2.5°C /OverTemp, VTemp - 2.4 V ~ 5.5 V 5-HVSOF SOT-665 - Open Drain Surface Mount -30°C ~ 100°C 7.5µA
TMP303GDRLR TMP303GDRLR Texas Instruments THERMOSTAT 90DEG ACT HI SOT563-6 В наличност38274 pcs Active High Tape & Reel (TR) TMP303 Yes Hot 90°C 8mA ±1°C OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Hysteresis Push-Pull Surface Mount -40°C ~ 125°C 4µA
TC6501P120VCTTRG TC6501P120VCTTRG Microchip Technology THERMOSTAT 120DEG ACT LO SOT23-5 В наличност4490 pcs Active Low Tape & Reel (TR) TC650 Yes Hot 120°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 135°C 17µA
MAX6501UKP075+T MAX6501UKP075+T Analog Devices Inc./Maxim Integrated IC TEMP SWITCH SOT23-5 В наличност40880 pcs Active Low Tape & Reel (TR) MAX650 Yes Hot 75°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 135°C 30µA
TMP303CDRLT TMP303CDRLT Texas Instruments THERMOSTAT 60DEG ACT HI SOT563-6 В наличност26288 pcs Active High Tape & Reel (TR) TMP303 Yes Hot 60°C 8mA ±1°C OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Hysteresis Push-Pull Surface Mount -40°C ~ 125°C 4µA
TC650AGVUA TC650AGVUA Microchip Technology THERMOSTAT 65DEGC ACTV LOW 8MSOP В наличност27191 pcs Active Low Tube TC650 No Hot 65°C - ±3°C /Fault, /OverTemp, PWM - 2.8 V ~ 5.5 V 8-MSOP 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Fan Controller - Surface Mount -40°C ~ 125°C 50µA
MAX6509HAUK+T MAX6509HAUK+T Analog Devices Inc./Maxim Integrated THERMOSTAT PROG ACT LOW SOT23-5 В наличност31366 pcs Active Low Tape & Reel (TR) MAX6509 Yes Hot Programmable 20mA ±4.7°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 32µA
TMP303GDRLT TMP303GDRLT Texas Instruments THERMOSTAT 90DEG ACT HI SOT563-6 В наличност19888 pcs Active High Tape & Reel (TR) TMP303 Yes Hot 90°C 8mA ±1°C OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Hysteresis Push-Pull Surface Mount -40°C ~ 125°C 4µA
MAX6502UKP045+T MAX6502UKP045+T Analog Devices Inc./Maxim Integrated IC TEMP SWITCH SOT23-5 В наличност63960 pcs - Strip MAX650 - - - - - - * - - - - - - - -
LM26CIM5-NPA LM26CIM5-NPA Texas Instruments THERMOSTAT 45DEGC ACT LO SOT23-5 В наличност4470 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 45°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
TMP302BDRLR TMP302BDRLR Texas Instruments THERMOSTAT ACT LOW OPEN DRN 6SOT В наличност141210 pcs Active Low Tape & Reel (TR) TMP302 Yes Hot 70°C, 75°C, 80°C, 85°C 10mA ±0.2°C /OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 8µA
MAX6501UKP065 MAX6501UKP065 Analog Devices Inc./Maxim Integrated MICROPOWER TEMPERATURE SWITCH В наличност67780 pcs Active Low Bulk MAX6501 Yes Hot 65°C 20mA ±4°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 Selectable Hysteresis Open Drain Surface Mount -55°C ~ 125°C 30µA
TMP302BDRLT TMP302BDRLT Texas Instruments THERMOSTAT ACT LOW OPEN DRN 6SOT В наличност60480 pcs Active Low Tape & Reel (TR) TMP302 Yes Hot 70°C, 75°C, 80°C, 85°C 10mA ±2°C /OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 8µA
TMP01FSZ-REEL TMP01FSZ-REEL Analog Devices Inc. THERMOSTAT PROG ACT HIGH 8SOIC В наличност4498 pcs Active High Tape & Reel (TR) TMP01 Yes Cold, Hot Programmable 50mA ±1°C /OverTemp, /UnderTemp - 4.5 V ~ 13.2 V 8-SOIC 8-SOIC (0.154', 3.90mm Width) - Open Collector Surface Mount -55°C ~ 125°C 500µA
TMP303ADRLT TMP303ADRLT Texas Instruments THERMOSTAT PROG ACT HI SOT563-6 В наличност20157 pcs Active High Tape & Reel (TR) TMP303 Yes Hot Programmable 8mA ±0.2°C OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Hysteresis Push-Pull Surface Mount -40°C ~ 125°C 4µA
LM26CIM5-XPA LM26CIM5-XPA Texas Instruments THERMOSTAT 105DEG ACT LO SOT23-5 В наличност4730 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 105°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
LM26CIM5-RPA LM26CIM5-RPA Texas Instruments THERMOSTAT 65DEGC ACT LO SOT23-5 В наличност36680 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 65°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
MAX6686AU75L+T MAX6686AU75L+T Analog Devices Inc./Maxim Integrated THERMOSTAT ACT LOW OPEN DR 8UMAX В наличност15765 pcs Active Low Tape & Reel (TR) MAX6686 No Hot 75°C ~ 115°C, 120°C 20mA ±1.5°C OverTemp, /OverTemp - 3 V ~ 5.5 V 8-uMAX/uSOP 8-TSSOP, 8-MSOP (0.118', 3.00mm Width) Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 200µA
TMP390AQDRLTQ1 TMP390AQDRLTQ1 Texas Instruments DUAL TRIP TEMPERATURE SWITCH В наличност43340 pcs Active Low Tape & Reel (TR) TMP390 Yes Cold, Hot Programmable - ±3°C OverTemp Automotive, AEC-Q100 1.62 V ~ 5.5 V - SOT-563, SOT-666 Selectable Trip Point Open Drain Surface Mount -40°C ~ 130°C 500nA
LM57TSPWRQ1 LM57TSPWRQ1 Texas Instruments THERMOSTAT PROG ACT HI/LO 8TSSOP В наличност22146 pcs Active High, Active Low Tape & Reel (TR) LM57 No Hot Programmable 5mA ±2.3°C OverTemp, /OverTemp Automotive, AEC-Q100 2.4 V ~ 5.5 V 8-TSSOP 8-TSSOP (0.173', 4.40mm Width) Selectable Trip Point, Trip Test Open Drain, Push-Pull Surface Mount -50°C ~ 160°C 26µA
S-5844A80CC-A4T2U3 S-5844A80CC-A4T2U3 ABLIC Inc. THERMOSTAT OPEN DRAIN HSNT4-B В наличност112550 pcs - Tape & Reel (TR) S-5844 No - - 10mA ±2.5°C /OverTemp S-5844A 1.65 V ~ 5.5 V HSNT-4-B 4-SMD, Flat Lead Exposed Pad - Open Drain Surface Mount -40°C ~ 125°C 180nA
MAX6501UKP085 MAX6501UKP085 Analog Devices Inc./Maxim Integrated MICROPOWER TEMPERATURE SWITCH В наличност12102 pcs Active Low Bulk MAX6501 Yes Hot 85°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 Selectable Hysteresis Open Drain Surface Mount -55°C ~ 125°C 30µA
TC650AEVUATR TC650AEVUATR Microchip Technology THERMOSTAT 55DEGC ACTV LOW 8MSOP В наличност17585 pcs Active Low Tape & Reel (TR) TC650 No Hot 55°C - ±3°C /Fault, /OverTemp, PWM - 2.8 V ~ 5.5 V 8-MSOP 8-TSSOP, 8-MSOP (0.118', 3.00mm Width) Fan Controller - Surface Mount -40°C ~ 125°C 50µA
TMP709AIDBVT TMP709AIDBVT Texas Instruments THERMOSTAT PROG ACT LOW SOT23-5 В наличност61770 pcs Active Low Tape & Reel (TR) TMP709 Yes Hot Programmable 20mA ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 40µA
MAX6503UKP015+T MAX6503UKP015+T Analog Devices Inc./Maxim Integrated IC TEMP SWITCH SOT23-5 В наличност43616 pcs Active Low Tape & Reel (TR) MAX650 Yes Cold 15°C 20mA ±4°C /UnderTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 135°C 30µA
LM26CIM5-XHA LM26CIM5-XHA Texas Instruments THERMOSTAT 100DEG ACT LO SOT23-5 В наличност4230 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 100°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
TMP303DDRLR TMP303DDRLR Texas Instruments THERMOSTAT 125DEG PSH-PUL SOT563 В наличност44888 pcs Active High Tape & Reel (TR) TMP303 Yes Hot 125°C 8mA ±0.2°C OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Hysteresis Push-Pull Surface Mount -40°C ~ 125°C 4µA
TC6502P085VCTTR TC6502P085VCTTR Microchip Technology THERMOSTAT 85DEGC ACT HI SOT23-5 В наличност58590 pcs Active High Tape & Reel (TR) TC650 Yes Hot 85°C 20mA ±6°C OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Push-Pull Surface Mount -55°C ~ 135°C 17µA
ADT6501SRJZP115RL7 ADT6501SRJZP115RL7 Analog Devices Inc. THERMOSTAT 115DEG ACT LO SOT23-5 В наличност44666 pcs Active Low Tape & Reel (TR) ADT6501 Yes Hot 115°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 30µA
LM26CIM5-VHA LM26CIM5-VHA Texas Instruments THERMOSTAT 90DEGC ACT LO SOT23-5 В наличност4660 pcs Active Low Tape & Reel (TR) LM26 Yes Hot 90°C - ±3°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 16µA
MAX6501UKP045+T MAX6501UKP045+T Analog Devices Inc./Maxim Integrated THERMOSTAT 45DEGC ACT LO SOT23-5 В наличност39378 pcs Active Low Tape & Reel (TR) MAX6501 Yes Hot 45°C 20mA ±4°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 135°C 30µA
TMP300BQDCKRQ1 TMP300BQDCKRQ1 Texas Instruments THERMOSTAT PROG ACTIVE LO SC70-6 В наличност35616 pcs Active Low Tape & Reel (TR) TMP300 No Hot Programmable - ±6°C /OverTemp Automotive, AEC-Q100 1.8 V ~ 18 V SC-70-6 6-TSSOP, SC-88, SOT-363 Selectable Trip Point Open Drain Surface Mount -40°C ~ 150°C 110µA
MCP9501PT-065E/OT MCP9501PT-065E/OT Microchip Technology THERMOSTAT 65DEGC ACT LO SOT23-5 В наличност71390 pcs Active Low Tape & Reel (TR) MCP9501 Yes Hot 65°C 20mA ±4°C /OverTemp - 3 V ~ 6 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -40°C ~ 125°C 25µA
ADT6501SRJZP065RL7 ADT6501SRJZP065RL7 Analog Devices Inc. THERMOSTAT 65DEGC ACT LO SOT23-5 В наличност42149 pcs Active Low Tape & Reel (TR) ADT6501 Yes Hot 65°C 20mA ±4°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 30µA
TMP302ADRLT TMP302ADRLT Texas Instruments THERMOSTAT ACT LOW OPEN DRN 6SOT В наличност69880 pcs Active Low Tape & Reel (TR) TMP302 Yes Hot 50°C, 55°C, 60°C, 65°C 10mA ±2°C /OverTemp - 1.4 V ~ 3.6 V SOT-5X3 SOT-563, SOT-666 Selectable Trip Point Open Drain Surface Mount -40°C ~ 125°C 8µA
TMP300BIDBVT TMP300BIDBVT Texas Instruments THERMOSTAT PROG ACT LOW SOT23-6 В наличност17803 pcs Active Low Tape & Reel (TR) TMP300 No Hot Programmable - ±6°C /OverTemp - 1.8 V ~ 18 V SOT-23-6 SOT-23-6 Selectable Trip Point Open Drain Surface Mount -40°C ~ 150°C 110µA
MAX6501UKP125+T MAX6501UKP125+T Analog Devices Inc./Maxim Integrated IC TEMP SWITCH SOT23-5 В наличност34777 pcs Active Low Tape & Reel (TR) MAX650 Yes Hot 125°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 135°C 30µA
ADT6501SRJZP085RL7 ADT6501SRJZP085RL7 Analog Devices Inc. THERMOSTAT 85DEGC ACT LO SOT23-5 В наличност43910 pcs Active Low Tape & Reel (TR) ADT6501 Yes Hot 85°C 20mA ±6°C /OverTemp - 2.7 V ~ 5.5 V SOT-23-5 SC-74A, SOT-753 - Open Drain Surface Mount -55°C ~ 125°C 30µA
TC620CCOA713 TC620CCOA713 Microchip Technology THERMOSTAT PROG ACT HIGH 8SOIC В наличност30371 pcs Active High Tape & Reel (TR) TC620 Yes Cold, Hot Programmable 1mA ±3°C OverTemp, UnderTemp - 4.5 V ~ 18 V 8-SOIC 8-SOIC (0.154', 3.90mm Width) - Push-Pull Surface Mount 0°C ~ 70°C 270µA
123456
0 RFQ
Карта за пазаруване (0 Items)
Празно е.
Сравнете списъка (0 Items)
Празно е.
Обратна връзка

Вашите отзиви имат значение!В Allelco ценим потребителското изживяване и се стремим да го подобряваме постоянно.
Моля, споделете вашите коментари с нас чрез нашата форма за обратна връзка и ние ще отговорим незабавно.
Благодаря ви, че избрахте Allelco.

Предмет
Електронна поща
Коментари
Captcha
Плъзнете или щракнете, за да качите файл
Качи файл
типове: .xls, .xlsx, .doc, .docx, .jpg, .png и .pdf.
Макс. Размер на файла: 10MB