Su di noi Contatto Inviare BOM
Richiesta di offerta(0)
Italia
Chiudere menu
Mostra tutto

Versione inglese è quella ufficialeTornare a

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)
Asia/Pacifico
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India e Medio Oriente
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
Sud America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
Nord America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
CasaCentro di prodottiCondensatoriTrimmers, condensatori variabili

Trimmers, condensatori variabili

Prodotti 60 trovati

Elenco dei prodotti

12
Confronto Immagine Parte # fabbricante Descrizione Magazzino Modello ECAD RoHS Serie Tensione - nominale temperatura di esercizio Tipo montaggio Dimensioni / Dimension Altezza - In sede (max) Caratteristiche materiale dielettrico Intervallo di capacità Tipo di regolazione Q alla frequenza Numero di prodotto di base Pacchetto Quantità
TZB4P400BA10R00 TZB4P400BA10R00 Murata Electronics CAP TRIMMER 8.5-40PF 100V SMD In magazzino141300 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.126" (3.20mm) General Purpose Ceramic 8.5 ~ 40pF Top 300 @ 1MHz TZB4P400 Tape & Reel (TR)
TZY2Z060AC01R00 TZY2Z060AC01R00 Murata Electronics CAP TRIMMER 2.5-6PF 25V SMD In magazzino668600 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 2.5 ~ 6pF Top 500 @ 1MHz TZY2Z060 Tape & Reel (TR)
TZY2R200A001R00 TZY2R200A001R00 Murata Electronics CAP TRIMMER 4.5-20PF 25V SMD In magazzino356700 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 4.5 ~ 20pF Top 500 @ 1MHz TZY2R200 Tape & Reel (TR)
TZY2Z030A001R00 TZY2Z030A001R00 Murata Electronics CAP TRIMMER 1.5-3PF 25V SMD In magazzino390500 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 1.5 ~ 3pF Top 300 @ 1MHz TZY2Z030 Tape & Reel (TR)
TZC3Z030A110R00 TZC3Z030A110R00 Murata Electronics CAP TRIMMER 1.4-3PF 100V SMD In magazzino744600 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.067' (1.70mm) General Purpose Ceramic 1.4 ~ 3pF Top 300 @ 1MHz TZC3Z030 Cut Tape (CT)
BFC280908003 BFC280908003 Vishay Beyschlag/Draloric/BC Components CAP TRIMMER 5-57PF 250V TH In magazzino2936 pcs BFC2 809 250 V -40°C ~ 125°C Through Hole 0.429' L x 0.413' W (10.90mm x 10.50mm) 0.433' (11.00mm) General Purpose - 5 ~ 57pF Top and Bottom - - Bulk
9702-1SL-1R3 9702-1SL-1R3 Knowles Johanson Manufacturing CAP TRIMMER 1-5PF 250V SMD In magazzino6090 pcs Thin-Trim® 250 V -55°C ~ 125°C Surface Mount 0.145" Dia (3.68mm) 0.040" (1.02mm) General Purpose Ceramic 1 ~ 5pF Top 1000 @ 100MHz - Tape & Reel (TR)
TZY2Z060A001R00 TZY2Z060A001R00 Murata Electronics CAP TRIMMER 2.5-6PF 25V SMD In magazzino888700 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.098" W (3.20mm x 2.50mm) 0.049" (1.25mm) General Purpose Ceramic 2.5 ~ 6pF Top 500 @ 1MHz TZY2Z060 Tape & Reel (TR)
TZY2K450A001R00 TZY2K450A001R00 Murata Electronics CAP TRIMMER 8-45PF 25V SMD In magazzino789000 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 8 ~ 45pF Top 300 @ 1MHz TZY2K450 Tape & Reel (TR)
TZY2R250A001R00 TZY2R250A001R00 Murata Electronics CAP TRIMMER 5.5-25PF 25V SMD In magazzino151800 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 5.5 ~ 25pF Top 300 @ 1MHz TZY2R250 Tape & Reel (TR)
LXRW0YV201-059 LXRW0YV201-059 Murata Electronics CAP TRIM 100-200PF 50V SMD In magazzino110000 pcs LXRW 50 V -25°C ~ 85°C Surface Mount 0.024" L x 0.024" W (0.60mm x 0.60mm) 0.011" (0.28mm) General Purpose - 100 ~ 200pF Top - - Tape & Reel (TR)
TZS2Z100A001R00 TZS2Z100A001R00 Murata Electronics CAP TRIMMER 3.5-10PF 25V SMD In magazzino52500 pcs TZS2 25 V -25°C ~ 85°C Surface Mount 0.106' L x 0.087' W (2.70mm x 2.20mm) 0.039' (1.00mm) Low Profile Ceramic 3.5 ~ 10pF Top 500 @ 1MHz TZS2Z100 Cut Tape (CT)
LXRW0YV600-054 LXRW0YV600-054 Murata Electronics CAP TRIMMER 30-60PF 50V SMD In magazzino135560 pcs - 50 V -30°C ~ 85°C Surface Mount 0.024" L x 0.024" W (0.60mm x 0.60mm) 0.012" (0.30mm) Voltage Tuning - 30 ~ 60pF - - LXRW0YV Tape & Reel (TR)
TZC3P300A110R00 TZC3P300A110R00 Murata Electronics CAP TRIMMER 6.5-30PF 100V SMD In magazzino37600 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.067' (1.70mm) General Purpose Ceramic 6.5 ~ 30pF Top 300 @ 1MHz TZC3P300 Tape & Reel (TR)
TZB4R200AA10R00 TZB4R200AA10R00 Murata Electronics CAP TRIMMER 4.5-20PF 100V SMD In magazzino776700 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.126" (3.20mm) General Purpose Ceramic 4.5 ~ 20pF Top 500 @ 1MHz TZB4R200 Tape & Reel (TR)
TZB4Z100AA10R00 TZB4Z100AA10R00 Murata Electronics CAP TRIMMER 3-10PF 100V SMD In magazzino187000 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.157' W (4.50mm x 4.00mm) 0.126' (3.20mm) General Purpose Ceramic 3 ~ 10pF Top 500 @ 1MHz TZB4Z100 Tape & Reel (TR)
BFC280811229 BFC280811229 Vishay Beyschlag/Draloric/BC Components CAP TRIMMER 2.5-22PF 250V TH In magazzino11690 pcs BFC2 808 250 V -40°C ~ 70°C Through Hole 0.299' Dia (7.60mm) 0.394' (10.00mm) General Purpose Polypropylene (PP) 2.5 ~ 22pF Top and Bottom - - Bulk
TZY2R250AC01R00 TZY2R250AC01R00 Murata Electronics CAP TRIMMER 5.5-25PF 25V SMD In magazzino824600 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 5.5 ~ 25pF Top 300 @ 1MHz TZY2R250 Tape & Reel (TR)
CTZ3E-20C-W1-PF CTZ3E-20C-W1-PF KYOCERA AVX CAP TRIMMER 4.5-20PF 25V SMD In magazzino820600 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.071" (1.80mm) Low Profile Ceramic 4.5 ~ 20pF Top 300 @ 1MHz - Tape & Reel (TR)
CTZ3E-10B-W1-PF CTZ3E-10B-W1-PF KYOCERA AVX CAP TRIMMER 1.5-10PF 25V SMD In magazzino446300 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.071" (1.80mm) Low Profile Ceramic 1.5 ~ 10pF Top 300 @ 1MHz - Tape & Reel (TR)
TZV2R200A110R00 TZV2R200A110R00 Murata Electronics CAP TRIMMER 4.5-20PF 25V SMD In magazzino75500 pcs TZV2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.091" W (3.20mm x 2.30mm) 0.057" (1.45mm) General Purpose Ceramic 4.5 ~ 20pF Top 500 @ 1MHz TZV2R200 Tape & Reel (TR)
TZY2Z100A001R00 TZY2Z100A001R00 Murata Electronics CAP TRIMMER 3-10PF 25V SMD In magazzino574400 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.098" W (3.20mm x 2.50mm) 0.049" (1.25mm) General Purpose Ceramic 3 ~ 10pF Top 500 @ 1MHz TZY2Z100 Tape & Reel (TR)
TZB4P300AA10R00 TZB4P300AA10R00 Murata Electronics CAP TRIMMER 6.5-30PF 100V SMD In magazzino419100 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.157' W (4.50mm x 4.00mm) 0.126' (3.20mm) General Purpose Ceramic 6.5 ~ 30pF Top 300 @ 1MHz TZB4P300 Tape & Reel (TR)
TZB4Z030AA10R00 TZB4Z030AA10R00 Murata Electronics CAP TRIMMER 1.4-3PF 100V SMD In magazzino278100 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.126" (3.20mm) General Purpose Ceramic 1.4 ~ 3pF Top 300 @ 1MHz TZB4Z030 Tape & Reel (TR)
TZY2Z2R5A001R00 TZY2Z2R5A001R00 Murata Electronics CAP TRIMMER 0.65-2.5PF 25V SMD In magazzino726000 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 0.65 ~ 2.5pF Top 200 @ 200MHz TZY2Z2R5 Tape & Reel (TR)
TZV2Z2R5A110R00 TZV2Z2R5A110R00 Murata Electronics CAP TRIMMER 0.65-2.5PF 25V SMD In magazzino109840 pcs TZV2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.091' W (3.20mm x 2.30mm) 0.057' (1.45mm) General Purpose Ceramic 0.65 ~ 2.5pF Top 200 @ 200MHz TZV2Z2R5 Tape & Reel (TR)
TZC3P200A110R00 TZC3P200A110R00 Murata Electronics CAP TRIMMER 5-20PF 100V SMD In magazzino681500 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.067' (1.70mm) General Purpose Ceramic 5 ~ 20pF Top 300 @ 1MHz TZC3P200 Tape & Reel (TR)
TZY2R200AC01R00 TZY2R200AC01R00 Murata Electronics CAP TRIMMER 4.5-20PF 25V SMD In magazzino149700 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.098' W (3.20mm x 2.50mm) 0.049' (1.25mm) General Purpose Ceramic 4.5 ~ 20pF Top 500 @ 1MHz TZY2R200 Tape & Reel (TR)
TZC3R100A110R00 TZC3R100A110R00 Murata Electronics CAP TRIMMER 3-10PF 100V SMD In magazzino769900 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.067' (1.70mm) General Purpose Ceramic 3 ~ 10pF Top 500 @ 1MHz TZC3R100 Cut Tape (CT)
TZC3Z060A110R00 TZC3Z060A110R00 Murata Electronics CAP TRIMMER 2-6PF 100V SMD In magazzino246800 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.067" (1.70mm) General Purpose Ceramic 2 ~ 6pF Top 500 @ 1MHz TZC3Z060 Tape & Reel (TR)
CTZ3E-05A-W1-PF CTZ3E-05A-W1-PF KYOCERA AVX CAP TRIMMER 1.5-5PF 25V SMD In magazzino175200 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.071" (1.80mm) Low Profile Ceramic 1.5 ~ 5pF Top 300 @ 1MHz - Tape & Reel (TR)
TZV2Z100A110R00 TZV2Z100A110R00 Murata Electronics CAP TRIMMER 3-10PF 25V SMD In magazzino554700 pcs TZV2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.091" W (3.20mm x 2.30mm) 0.057" (1.45mm) General Purpose Ceramic 3 ~ 10pF Top 500 @ 1MHz TZV2Z100 Tape & Reel (TR)
TZY2Z100AC01R00 TZY2Z100AC01R00 Murata Electronics CAP TRIMMER 3-10PF 25V SMD In magazzino356500 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.098" W (3.20mm x 2.50mm) 0.049" (1.25mm) General Purpose Ceramic 3 ~ 10pF Top 500 @ 1MHz TZY2Z100 Tape & Reel (TR)
TZY2Z030AC01R00 TZY2Z030AC01R00 Murata Electronics CAP TRIMMER 1.5-3PF 25V SMD In magazzino450000 pcs TZY2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.098" W (3.20mm x 2.50mm) 0.049" (1.25mm) General Purpose Ceramic 1.5 ~ 3pF Top 300 @ 1MHz TZY2Z030 Tape & Reel (TR)
CTZ3E-50C-W1-PF CTZ3E-50C-W1-PF KYOCERA AVX CAP TRIMMER 4.5-50PF 25V SMD In magazzino215100 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.071' (1.80mm) Low Profile Ceramic 4.5 ~ 50pF Top 200 @ 1MHz - Tape & Reel (TR)
TZB4P300BB10R00 TZB4P300BB10R00 Murata Electronics CAP TRIMMER 6.5-30PF 100V SMD In magazzino815100 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.126" (3.20mm) General Purpose Ceramic 6.5 ~ 30pF Top 300 @ 1MHz TZB4P300 Tape & Reel (TR)
TZB4Z250AA10R00 TZB4Z250AA10R00 Murata Electronics CAP TRIMMER 4-25PF 50V SMD In magazzino823700 pcs TZB4 50 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.126" (3.20mm) General Purpose Ceramic 4 ~ 25pF Top 300 @ 1MHz TZB4Z250 Tape & Reel (TR)
TZV2Z030A110R00 TZV2Z030A110R00 Murata Electronics CAP TRIMMER 1.5-3PF 25V SMD In magazzino352100 pcs TZV2 25 V -25°C ~ 85°C Surface Mount 0.126' L x 0.091' W (3.20mm x 2.30mm) 0.057' (1.45mm) General Purpose Ceramic 1.5 ~ 3pF Top 300 @ 1MHz TZV2Z030 Tape & Reel (TR)
TZB4Z060AA10R00 TZB4Z060AA10R00 Murata Electronics CAP TRIMMER 2-6PF 100V SMD In magazzino280900 pcs TZB4 100 V -25°C ~ 85°C Surface Mount 0.177' L x 0.157' W (4.50mm x 4.00mm) 0.126' (3.20mm) General Purpose Ceramic 2 ~ 6pF Top 500 @ 1MHz TZB4Z060 Tape & Reel (TR)
TZV2Z060A110R00 TZV2Z060A110R00 Murata Electronics CAP TRIMMER 2.5-6PF 25V SMD In magazzino511800 pcs TZV2 25 V -25°C ~ 85°C Surface Mount 0.126" L x 0.091" W (3.20mm x 2.30mm) 0.057" (1.45mm) General Purpose Ceramic 2.5 ~ 6pF Top 500 @ 1MHz TZV2Z060 Tape & Reel (TR)
TZB4R500AA10R00 TZB4R500AA10R00 Murata Electronics CAP TRIMMER 7-50PF 50V SMD In magazzino531600 pcs TZB4 50 V -25°C ~ 85°C Surface Mount 0.177' L x 0.157' W (4.50mm x 4.00mm) 0.126' (3.20mm) General Purpose Ceramic 7 ~ 50pF Top 300 @ 1MHz TZB4R500 Tape & Reel (TR)
GKG3R066-07 GKG3R066-07 Sprague-Goodman CAP TRIMMER 1.4-3PF 100V SMD In magazzino831100 pcs SURFTRIM® GKG 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.157" W (4.50mm x 4.00mm) 0.106" (2.70mm) General Purpose Ceramic 1.4 ~ 3pF Top 300 @ 10MHz - Tape & Reel (TR)
BFC280905001 Vishay Beyschlag/Draloric/BC Components CAP TRIMMER 1.2-3.5PF 300V TH In magazzino8489 pcs BFC2 809 300 V -40°C ~ 125°C Through Hole 0.291" L x 0.264" W (7.40mm x 6.70mm) 0.354" (9.00mm) General Purpose - 1.2 ~ 3.5pF Top and Bottom - - Bulk
CTZ3S-20C-W1-PF KYOCERA AVX CAP TRIMMER 4.5-20PF 25V SMD In magazzino230100 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.071' (1.80mm) Low Profile Ceramic 4.5 ~ 20pF Top 300 @ 1MHz - Tape & Reel (TR)
57273R5 Knowles Johanson Manufacturing CAP FILM TRIM In magazzino2447 pcs * - - - - - - - - - - - Bulk
CTZ3S-40C-W1-PF KYOCERA AVX CAP TRIMMER 4.5-40PF 25V SMD In magazzino596200 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.071' (1.80mm) Low Profile Ceramic 4.5 ~ 40pF Top 300 @ 1MHz - Tape & Reel (TR)
TZC3Z060AA01R00 Murata Electronics CAP TRIMMER 2-6PF 100V SMD In magazzino193600 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.067" (1.70mm) General Purpose Ceramic 2 ~ 6pF Top 500 @ 1MHz TZC3Z060 Tape & Reel (TR)
CTZ3S-10A-W1-PF KYOCERA AVX CAP TRIMMER 2.5-10PF 25V SMD In magazzino596000 pcs CTZ, Kyocera 25 V -40°C ~ 85°C Surface Mount 0.177' L x 0.126' W (4.50mm x 3.20mm) 0.071' (1.80mm) Low Profile Ceramic 2.5 ~ 10pF Top 300 @ 1MHz - Tape & Reel (TR)
AC10 Knowles Voltronics CAP TRIMMER 1-10PF 250V TH In magazzino783 pcs A 250 V -65°C ~ 125°C Through Hole 0.250" Dia (6.35mm) 0.500" (12.70mm) General Purpose Air 1 ~ 10pF Top 5000 @ 100MHz - Bulk
TZC3P300AA01R00 Murata Electronics CAP TRIMMER 6.5-30PF 100V SMD In magazzino579100 pcs TZC3 100 V -25°C ~ 85°C Surface Mount 0.177" L x 0.126" W (4.50mm x 3.20mm) 0.067" (1.70mm) General Purpose Ceramic 6.5 ~ 30pF Top 300 @ 1MHz TZC3P300 Tape & Reel (TR)
12
Allelco
Chi siamo
Storia
Certificazioni
Reclutamento
Politiche
Termini e condizioni
Policy sulla privacy
Policy sui cookie
Servizi
Tracciamento dell'ordine
Rimborso e restituzione
Domande frequenti
Contatto
Ordine
Spedizione e consegna
Modalità di pagamento
Mio No. di conto
I blogParti caldeCambia linguaNotiziaMappa del sito
Contatto
Indirizzo del quartier generale:
Camera C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
Hong Kong
Servizio tel: +852-91464856
Email di servizio: info@allelco.com
Seguirci su
Copyright © 2012-2023 AllelcoElec.com. Tutti i diritti riservati.
0 RFQ
Carrello della spesa (0 Items)
È vuoto.
Invia richiesta
Confronta l'elenco (0 Items)
È vuoto.
Feedback

Il tuo feedback è importante!In Allelco, apprezziamo l'esperienza dell'utente e ci impegniamo a migliorarla costantemente.
Per favore condividi i tuoi commenti con noi tramite il nostro modulo di feedback e risponderemo prontamente.
Grazie per aver scelto Allelco.

Soggetto
E-mail
Note / Commenti
Codice di verifica
Trascinare o fare clic per caricare il file
Caricare un file
Tipi: .xls, .xlsx, .doc, .docx, .jpg, .png e .pdf.Dimensione del file max
: 10 MB