3502价格

参考价格:¥1.8264

型号:3502 品牌:Keystone 备注:这里有3502多少钱,2024年最近7天走势,今日出价,今日竞价,3502批发/采购报价,3502行情走势销售排行榜,3502报价。
型号 功能描述 生产厂家&企业 LOGO 操作
3502

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine
3502

200V-1,000VThreePhaseBridge40.0A-60.0AForwardCurrent70ns-3000nsRecoveryTime

40.0A-60.0AForwardCurrent 70ns-3000nsRecoveryTime

VMI

Voltage Multipliers

VMI
3502

LowThermalEMFReedRelays

LOWTHERMALEMFREEDRELAYS The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

RHOPOINT

Rhopoint Instruments

RHOPOINT
3502

包装:袋 描述:SHARP MEMORY DISPLAY BREAKOUT - 光电器件 显示器模块 - LCD,OLED,图形

Adafruit

Adafruit Industries LLC

Adafruit
3502

包装:散装 描述:CONN PIN RCPT .015-.025 PRESSFIT 连接器,互连器件 PC 引脚插座,插座连接器

Keystone Electronics

Keystone Electronics

Keystone Electronics

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

LowThermalEMFReedRelays

LowThermalEMFReedRelays The3500SeriesisideallysuitedtotheneedsofInstrumentation,DataAcquisitionandProcessControl.Thespecificationtablesallowyoutoselecttheappropriaterelayforyourparticularapplication.RecommendedforuseinhighaccuracyDVM’s,MultiplexersandDig

COTO

科特

COTO

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine

3500MHzLowPowerUltraCMOS??Divide-by-4Prescaler

ProductDescription ThePE3502isahighperformancemonolithicUltraCMOS™prescalerwithafixeddivideratioof4.Itsoperatingfrequencyrangeis1500MHzto3500MHz.ThePE3502operatesonanominal3Vsupplyanddrawsonly12mA.Itispackagedinasmall8-leadMSOPandisidealformicr

Peregrine

Peregrine Semiconductor

Peregrine

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

TheStandardforToolsandWorkbenchAccessories

[MendaPump] ToOurCustomers TheMENDA®brandnamehasbeensynonymouswithinnovationandqualitysince1947.MENDAisfamousforitshighperformancelineofdishtypeliquiddispenserpumpsandbottles.Thesepumpsandbottlesarenowwidelyusedinindustrialelectronicsassembly,cleanroom,

etc2List of Unclassifed Manufacturers

etc2未分类制造商

etc2

340kHz,2ASynchronousDC-DCBuckConverterOutputCurrent:2A

GeneralDescription TheAP3502Eisa340kHzfixedfrequency,currentmode,PWMsynchronousbuck(step-down)DC-DCconverter,capableofdrivinga2Aloadwithhighefficiency,excellentlineandloadregulation.TheAP3502Eexhibitshighefficiencyatlightload.ThedeviceintegratesN-channel

BCDSEMIBCD Semiconductor Manufacturing Limited

新进半导体上海新进半导体制造有限公司

BCDSEMI

340kHz,2ASynchronousDC-DCBuckConverterOutputCurrent:2A

GeneralDescription TheAP3502Eisa340kHzfixedfrequency,currentmode,PWMsynchronousbuck(step-down)DC-DCconverter,capableofdrivinga2Aloadwithhighefficiency,excellentlineandloadregulation.TheAP3502Eexhibitshighefficiencyatlightload.ThedeviceintegratesN-channel

BCDSEMIBCD Semiconductor Manufacturing Limited

新进半导体上海新进半导体制造有限公司

BCDSEMI

200V-1,000VThreePhaseBridge40.0A-60.0AForwardCurrent70ns-3000nsRecoveryTime

40.0A-60.0AForwardCurrent 70ns-3000nsRecoveryTime

VMI

Voltage Multipliers

VMI

200V-1,000VThreePhaseBridge40.0A-60.0AForwardCurrent70ns-3000nsRecoveryTime

40.0A-60.0AForwardCurrent 70ns-3000nsRecoveryTime

VMI

Voltage Multipliers

VMI

Board-InRightAngleCrimpTerminal35021,Reel,BrassTin(Sn)

文件:331.81 Kbytes Page:4 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

Board-InRightAngleCrimpTerminal35021,Reel,BrassTin(Sn)

文件:331.81 Kbytes Page:4 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

2.00mm(.079)Board-InTerminalfor22-30AWG,RightAngle,PhosphorBronze,Lead-free,Post-TinPlating

文件:129.6 Kbytes Page:2 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

2.00mm(.079)Board-InTerminalfor22-30AWG,RightAngle,PhosphorBronze,Lead-free,Post-TinPlating

文件:129.6 Kbytes Page:2 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

Board-InRightAngleCrimpTerminal

文件:330.22 Kbytes Page:3 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

2.00/2.50mm(.079/.098)Board-InTerminal,RightAngle,PhosphorBronze,Pre-Plated

文件:330.21 Kbytes Page:3 Pages

MOLEX4Molex Electronics Ltd.

莫仕公司MOLEX莫仕公司

MOLEX4

3502产品属性

  • 类型

    描述

  • 型号

    3502

  • 功能描述

    电路板硬件 - PCB PRESS-FIT MICRO JACK

  • RoHS

  • 制造商

    Harwin

  • 类型

    Shield Clip

  • 长度

    9.4 mm

  • 材料

    Beryllium Copper

  • 电镀

    Tin

更新时间:2024-4-30 11:10:00
IC供应商 芯片型号 品牌 批号 封装 库存 备注 价格
MAXIM/美信
2021+
MSOP10
5000
原厂授权代理,海外优势订货渠道。可提供大量库存,详
TE/泰科
22+
SMD
6
只做原装进口 免费送样!!
JLX
22+
NA
2527340
原装现货,自产自销
KEYSTONE
2021+
SMD
100500
一级代理专营品牌!原装正品,优势现货,长期排单到货
JST
2022
NA
55000
正规渠道,只有原装!
SWITCHCRAFT
9801
100
公司优势库存 热卖中!
SwitchcraftInc
07+/08+
2697
TE
23+
接插件
3900000
代理直销,原厂原装,假一罚十,长期稳定供应
泰科|泰科
21+
12588
连接器
TYCO
连接器
123500
一级代理 原装正品假一罚十价格优势长期供货

3502芯片相关品牌

  • ACT
  • AME
  • A-POWER
  • Balluff
  • CONEC
  • FESTO
  • Kingbright
  • MCNIX
  • PASTERNACK
  • RSG
  • SUNTSU
  • XPPOWER

3502数据表相关新闻