مشاهدة الكل

يرجى الرجوع إلى النسخة الإنجليزية كنسخة رسمية لدينا.يعود

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)
الصفحة الرئيسيةمنتجاتإمدادات الطاقة - جبل المجلسمحولات dc dc

محولات dc dc

تم العثور على منتجات 11,620

قائمة المنتجات

1...178179180181182183184...233
قارن صورة جزء # الصانع وصف المخزون نموذج ECAD RoHS كفاءة عدد من المخرجات ميزات التحكم الحالي - الناتج (ماكس) الجهد - الإدخال (مين) الجهد - الناتج 1 الجهد - الناتج 2 الجهد - المخرج 3 الجهد - الناتج 4 الجهد - العزلة وكالة الموافقة الرقم القياسي رقم المنتج الأساسي طَرد تصاعد نوع سلسلة درجة حرارة التشغيل حجم / البعد الجهد - الإدخال (ماكس) اكتب الميزات التطبيقات حزمة / كيس تجار الأجهزة حزمة السلطة (واتس) كمية
VI-2N0-02 Vicor Corporation VI-2N0-02 24V/5.4V 150W S في المخزن4200 pcs - - - - - - - - - - - - VI-2N0 Bulk - * - - - - - - - - -
MI-J72-IZ Vicor Corporation DC DC CONVERTER 15V 25W في المخزن4700 pcs 90% 1 - 1.67A 100V 15V - - - 3 kV - - MI-J72 Bulk Through Hole MI-J00™ (25W) -40°C ~ 85°C 2.40' L x 2.28' W x 0.50' H (61.0mm x 57.9mm x 12.7mm) 310V Isolated Module Remote On/Off, OCP, OTP, OVP ITE (Commercial) 9-DIP Module - 25 W
PMC4518TWS Flex Power Modules DC DC CONVERTER 0.75-3.6V 58W في المخزن3478 pcs 96% 1 Enable, Active Low 16A 3V 0.75 ~ 3.6V - - - - CB, CSA, IEC, TUV, UL 62368-1 PMC451 Tape & Reel (TR) Surface Mount PMC 4000 -45°C ~ 115°C (With Derating) 1.30" L x 0.53" W x 0.32" H (33.0mm x 13.5mm x 8.3mm) 5.5V Non-Isolated PoL Module Adjustable Output, Remote On/Off, Remote Sense ITE (Commercial) 6-SMD Module - 58 W
PAF400F280-1.8 TDK-Lambda Americas Inc DC DC CONVERTER 1.8V 240W في المخزن4450 pcs 76% 1 - 100A 200V 1.8V - - - 3 kV - - - - Through Hole PAF400F -20°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 400V Isolated Module Remote On/Off, OCP, OVP ITE (Commercial) Full Brick Full Brick 240 W
VE-2W0-MX Vicor Corporation DC DC CONVERTER 5V 75W في المخزن5300 pcs 90% 1 - 15A 18V 5V - - - 3 kV - - VE-2W0 Bulk Through Hole VE-200™ (75W) -55°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 36V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
PMM8218TSR Flex Power Modules DC DC CONVERTER 0.8-5.5V 275W في المخزن1290 pcs 95.7% 1 Enable, Active Low 50A 8V 0.8 ~ 5.5V - - - - CB, CSA, IEC, TUV, UL 62368-1 PMM821 Tray Surface Mount PMM 8000 (275W) -40°C ~ 85°C (With Derating) 2.04" L x 1.04" W x 0.36" H (51.9mm x 26.5mm x 9.1mm) 14V Non-Isolated PoL Module Adjustable Output, Remote On/Off, Remote Sense ITE (Commercial) 20-SMD Module - 275 W
SXE15-48S1V8J Artesyn Embedded Power DC DC CONVERTER 1.8V 15W في المخزن3840 pcs 83% 1 - 6A 33V 1.8V - - - 1.5 kV - - - Tray Surface Mount SXE15 (15W) -40°C ~ 70°C 1.91' L x 1.15' W x 0.34' H (48.4mm x 29.2mm x 8.5mm) 75V Isolated Module Remote On/Off, OCP, OVP, UVLO ITE (Commercial) 12-SMD Module, 6 Leads - 15 W
VE-2T3-IV Vicor Corporation DC DC CONVERTER 24V 150W في المخزن4180 pcs 90% 1 - 6.25A 66V 24V - - - 3 kV - - VE-2T3 Bulk Through Hole VE-200™ (150W) -40°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 160V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 150 W
VI-2T0-CV-02 Vicor Corporation VI-2T0-CV-02 100V/5V150WSM في المخزن63 pcs - - - - - - - - - - - - VI-2T0 Bulk - * - - - - - - - - -
VE-243-EU Vicor Corporation DC DC CONVERTER 24V 200W في المخزن104 pcs 88% 1 - 8.33A 55V 24V - - - 3 kV - - VE-243 Bulk Through Hole VE-200™ (200W) -10°C ~ 85°C 4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm) 100V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 200 W
VE-JT3-IZ Vicor Corporation DC DC CONVERTER 24V 25W في المخزن77 pcs 90% 1 - 1.04A 66V 24V - - - 3 kV - - VE-JT3 Bulk Through Hole VE-J00™ (25W) -40°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 160V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 25 W
VE-J74-IX Vicor Corporation DC DC CONVERTER 48V 75W في المخزن4980 pcs 90% 1 - 1.56A 100V 48V - - - 3 kV - - VE-J74 Bulk Through Hole VE-J00™ (75W) -40°C ~ 100°C 2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm) 375V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 75 W
BXA30-24T05-15 Artesyn Embedded Power DC DC CONVERTER 5V +/-15V 30W في المخزن5150 pcs 81% 3 - 3A, 500mA, 500mA 18V 5V 15V -15V - 1.5 kV - - - Bulk Through Hole BXA30 (30W) -25°C ~ 100°C 3.02" L x 2.41" W x 0.52" H (76.3mm x 61.1mm x 13.3mm) 36V Isolated Module Remote On/Off, OVP, SCP ITE (Commercial) 8-DIP Module - 30 W
LAW005F ABB Power Electronics Inc. DC DC CONVERTER 3.3V 5W في المخزن5090 pcs 73% 1 - 1A 36V 3.3V - - - 1.5 kV - - - Bulk Through Hole LAW005 (5W) -25°C ~ 71°C 1.25' L x 0.80' W x 0.42' H (31.8mm x 20.3mm x 10.7mm) 75V Isolated Module OCP, OVP ITE (Commercial) Module - 5 W
VI-J32-05 Vicor Corporation DC DC CONVERTER 90W في المخزن87 pcs - - - - - - - - - - - - VI-J32 Bulk - * - - - - - - - - -
VE-252-EW Vicor Corporation DC DC CONVERTER 15V 100W في المخزن3670 pcs 88% 1 - 6.67A 100V 15V - - - 3 kV - - VE-252 Bulk Through Hole VE-200™ (100W) -10°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 200V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 100 W
VE-204-CY Vicor Corporation DC DC CONVERTER 48V 50W في المخزن5440 pcs 90% 1 - 1.04A 10V 48V - - - 3 kV - - VE-204 Bulk Through Hole VE-200™ (50W) -25°C ~ 85°C 4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm) 20V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 50 W
VE-231-IU-BM Vicor Corporation VE-231-IU-BM 48V/12V 200W في المخزن5490 pcs - - - - - - - - - - - - VE-231 Bulk - * - - - - - - - - -
VE-J34-MW Vicor Corporation DC DC CONVERTER 48V 100W في المخزن3820 pcs 90% 1 - 2.08A 42V 48V - - - 3 kV - - VE-J34 Bulk Through Hole VE-J00™ (100W) -55°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 60V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 100 W
BWS1205 Bel Power Solutions DC DC CONVERTER 5V 3W في المخزن5460 pcs 70% 1 - 500mA 9V 5V - - - 500 V - - - Bulk Through Hole BWS (3W) -25°C ~ 85°C 1.25' L x 0.80' W x 0.52' H (31.8mm x 20.3mm x 13.2mm) 18V Isolated Module SCP ITE (Commercial) 24-DIP Module, 8 Leads - 3 W
ISL8277MAIRZ Renesas Electronics America Inc DC DC CONVERTER 0.6-5V في المخزن4890 pcs - 1 - 25A 4.5V 0.6 ~ 5V - - - - - - ISL8277 Tray Surface Mount ISL8277M -40°C ~ 85°C 0.75" L x 0.67" W x 0.15" H (19.0mm x 17.0mm x 3.7mm) 14V Non-Isolated PoL Module, Digital Adjustable Output, PMBus™, Remote Sense ITE (Commercial) 41-PowerBQFN Module 41-HDA Module (17x19) -
VI-B64-EU-BM Vicor Corporation VI-B64-EU-BM 300V/48V200W في المخزن85 pcs - - - - - - - - - - - - VI-B64 Bulk - * - - - - - - - - -
LTM8002IY#PBF Analog Devices Inc. DC DC CONVERTER 0.97-18V في المخزن2036 pcs - 1 - 2.5A 3.4V 0.97 ~ 18V - - - - - - LTM8002 Tray Surface Mount LTM®, uModule® -40°C ~ 125°C 0.25" L x 0.25" W x 0.10" H (6.3mm x 6.3mm x 2.4mm) 40V Non-Isolated PoL Module, Digital OCP, OTP ITE (Commercial) 49-FBGA Module 49-BGA (6.25x6.25) -
VI-J61-12 Vicor Corporation DC DC CONVERTER 68.9W في المخزن57 pcs - - - - - - - - - - - - VI-J61 Bulk - * - - - - - - - - -
PTH08T210WAST Texas Instruments DC DC CONVERTER 0.7-3.6V في المخزن1267 pcs 93% 1 - 25A 5.5V 0.7 ~ 3.6V - - - - - - PTH08 Tape & Reel (TR) Surface Mount PTH08T210W -40°C ~ 85°C 1.37" L x 0.62" W x 0.37" H (34.8mm x 15.8mm x 9.4mm) 14V Non-Isolated PoL Module Remote On/Off, OCP, OTP, UVLO ITE (Commercial) 14-SMD Module - -
VE-2T2-EX Vicor Corporation DC DC CONVERTER 15V 75W في المخزن4140 pcs 88% 1 - 5A 66V 15V - - - 3 kV - - VE-2T2 Bulk Through Hole VE-200™ (75W) -10°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 160V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
VE-J51-IW Vicor Corporation DC DC CONVERTER 12V 100W في المخزن78 pcs 90% 1 - 8.33A 100V 12V - - - 3 kV - - VE-J51 Bulk Through Hole VE-J00™ (100W) -40°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 200V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 100 W
PMG4318TSR Flex Power Modules DC DC CONVERTER 0.8-2.5V 38W في المخزن2781 pcs 94.5% 1 Enable, Active Low 15A 2.95V 0.8 ~ 2.5V - - - - CB, CSA, IEC, TUV, UL 62368-1 PMG431 Tray Surface Mount PMG 4000 (37.5W) -40°C ~ 85°C (With Derating) 1.37" L x 0.62" W x 0.35" H (34.8mm x 15.8mm x 9.0mm) 3.65V Non-Isolated PoL Module Adjustable Output, Remote On/Off, Remote Sense ITE (Commercial) 10-SMD Module - 38 W
VE-250-CX Vicor Corporation DC DC CONVERTER 5V 75W في المخزن105 pcs 90% 1 - 15A 100V 5V - - - 3 kV - - VE-250 Bulk Through Hole VE-200™ (75W) -25°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 200V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
VE-J01-CZ Vicor Corporation DC DC CONVERTER 12V 25W في المخزن89 pcs 90% 1 - 2.08A 10V 12V - - - 3 kV - - VE-J01 Bulk Through Hole VE-J00™ (25W) -25°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 20V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 25 W
VE-JT3-EW Vicor Corporation DC DC CONVERTER 24V 100W في المخزن120 pcs 88% 1 - 4.17A 66V 24V - - - 3 kV - - VE-JT3 Bulk Through Hole VE-J00™ (100W) -10°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 160V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 100 W
VI-B60-03 Vicor Corporation DC DC CONVERTER 5V 200W في المخزن4280 pcs - - - - - - - - - - - - VI-B60 Bulk - * - - - - - - - - -
VI-B6Z-EU Vicor Corporation DC DC CONVERTER 2V 80W في المخزن4430 pcs 88% 1 - 40A 200V 2V - - - 3 kV - - VI-B6Z Bulk Through Hole VI-200™ (200W) -10°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 400V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 80 W
RFB350-48S12-R5TY Artesyn Embedded Power DC DC CONVERTER 12V 350W في المخزن4220 pcs 88% 1 Enable, Active Low 29.2A 36V 12V - - - 1.5 kV - - - Tray Through Hole RFB350 (350W) -40°C ~ 100°C 2.39" L x 2.27" W x 0.50" H (60.7mm x 57.7mm x 12.7mm) 75V Isolated Module Remote On/Off, OCP, OTP, OVP, SCP, UVLO ITE (Commercial) 9-DIP Module, 1/2 Brick - 350 W
VE-253-MX Vicor Corporation DC DC CONVERTER 24V 75W في المخزن5220 pcs 90% 1 - 3.13A 100V 24V - - - 3 kV - - VE-253 Bulk Through Hole VE-200™ (75W) -55°C ~ 85°C 4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm) 200V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
VI-J50-CZ-07 Vicor Corporation DC DC CONVERTER 25W في المخزن4160 pcs - - - - - - - - - - - - VI-J50 Bulk - * - - - - - - - - -
VE-JT0-EZ Vicor Corporation DC DC CONVERTER 5V 25W في المخزن129 pcs 88% 1 - 5A 66V 5V - - - 3 kV - - VE-JT0 Bulk Through Hole VE-J00™ (25W) -10°C ~ 100°C 2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm) 160V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 25 W
VE-272-EX Vicor Corporation DC DC CONVERTER 15V 75W في المخزن83 pcs 88% 1 - 5A 100V 15V - - - 3 kV - - VE-272 Bulk Through Hole VE-200™ (75W) -10°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 375V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
VE-J64-CY Vicor Corporation DC DC CONVERTER 48V 50W في المخزن94 pcs 90% 1 - 1.04A 200V 48V - - - 3 kV - - VE-J64 Bulk Through Hole VE-J00™ (50W) -25°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 400V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 50 W
VE-223-IY Vicor Corporation DC DC CONVERTER 24V 50W في المخزن5060 pcs 90% 1 - 2.08A 21V 24V - - - 3 kV - - VE-223 Bulk Through Hole VE-200™ (50W) -40°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 56V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 50 W
VE-2N4-MX Vicor Corporation DC DC CONVERTER 48V 75W في المخزن3870 pcs 90% 1 - 1.56A 36V 48V - - - 3 kV - - VE-2N4 Bulk Through Hole VE-200™ (75W) -55°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 76V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 75 W
VE-B6M-CU-S Vicor Corporation DC DC CONVERTER 10V 200W في المخزن4190 pcs 90% 1 - 20A 200V 10V - - - 3 kV - - VE-B6M Bulk Through Hole VE-200™ (200W) -25°C ~ 85°C 4.60' L x 1.80' W x 0.52' H (116.8mm x 45.7mm x 13.2mm) 400V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 200 W
VE-J43-IZ Vicor Corporation DC DC CONVERTER 24V 25W في المخزن5190 pcs 90% 1 - 1.04A 55V 24V - - - 3 kV - - VE-J43 Bulk Through Hole VE-J00™ (25W) -40°C ~ 100°C 2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm) 100V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 25 W
VE-26L-MV Vicor Corporation DC DC CONVERTER 28V 150W في المخزن4180 pcs 90% 1 - 5.36A 200V 28V - - - 3 kV - - VE-26L Bulk Through Hole VE-200™ (150W) -55°C ~ 85°C 4.60' L x 2.40' W x 0.50' H (116.8mm x 61.0mm x 12.7mm) 400V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 150 W
HC006A6A61Z ABB Power Electronics Inc. DC DC CONVERTER 5V 33W في المخزن4360 pcs 91% 1 Enable, Active Low 6.6A 18V 5V - - - 1.5 kV - - - Tray Through Hole HC006 -40°C ~ 85°C 1.86' L x 1.16' W x 0.34' H (47.2mm x 29.5mm x 8.5mm) 36V Isolated Module Remote On/Off, OCP, OTP, OVP, UVLO ITE (Commercial) 18-DIP Module, 6 Leads - 33 W
VI-BWK-CV Vicor Corporation DC DC CONVERTER 40V 150W في المخزن4940 pcs 90% 1 - 3.75A 18V 40V - - - 3 kV - - VI-BWK Bulk Through Hole VI-200™ (150W) -25°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 36V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 150 W
VE-J6J-IX Vicor Corporation DC DC CONVERTER 36V 75W في المخزن4390 pcs 90% 1 - 2.08A 200V 36V - - - 3 kV - - VE-J6J Bulk Through Hole VE-J00™ (75W) -40°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 400V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 75 W
VE-J6Z-IY Vicor Corporation DC DC CONVERTER 2V 20W في المخزن4800 pcs 90% 1 - 10A 200V 2V - - - 3 kV - - VE-J6Z Bulk Through Hole VE-J00™ (50W) -40°C ~ 100°C 2.28" L x 2.40" W x 0.50" H (57.9mm x 70.0mm x 12.7mm) 400V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 20 W
VE-J71-EZ Vicor Corporation DC DC CONVERTER 12V 25W في المخزن128 pcs 88% 1 - 2.08A 100V 12V - - - 3 kV - - VE-J71 Bulk Through Hole VE-J00™ (25W) -10°C ~ 100°C 2.28' L x 2.40' W x 0.50' H (57.9mm x 70.0mm x 12.7mm) 375V Isolated Module OCP, SCP ITE (Commercial) Half Brick - 25 W
VE-244-CY Vicor Corporation DC DC CONVERTER 48V 50W في المخزن5100 pcs 90% 1 - 1.04A 55V 48V - - - 3 kV - - - Bulk Through Hole VE-200™ (50W) -25°C ~ 85°C 4.60" L x 2.40" W x 0.50" H (116.8mm x 61.0mm x 12.7mm) 100V Isolated Module OCP, OTP, OVP, SCP ITE (Commercial) Full Brick - 50 W
1...178179180181182183184...233
0 RFQ
عربة التسوق (0 Items)
إنه فارغ.
قارن القائمة (0 Items)
إنه فارغ.
تعليق

ملاحظاتك مهمة!في Allelco ، نقدر تجربة المستخدم ونحن نسعى جاهدين لتحسينها باستمرار.
يرجى مشاركة تعليقاتك معنا عبر نموذج ملاحظاتنا ، وسنرد على الفور.
شكرا لك على اختيار Allelco.

موضوع
البريد الإلكتروني
تعليقات
كابتشا
اسحب أو انقر لتحميل الملف
رفع ملف
الأنواع: .xls ، .xlsx ، .doc ، .docx ، .jpg ، .png و .pdf.
أقصى حجم الملف: 10 ميغابايت