MJD44H11晶体三极管中文资料下载批发采购价格-IC资料网

您好,欢迎来到114ic资料网！

114ic电子网登录注册

芯片资料

芯片资料
库存查询
行业新闻
生产厂家
替换型号
晶体管

位置：首页 > IC中文资料第1211页 > MJD44H

MJD44H晶体管资料

MJD44H11别名：MJD44H11三极管、MJD44H11晶体管、MJD44H11晶体三极管
MJD44H11生产厂家：韩国三星公司
MJD44H11制作材料：
MJD44H11性质：低频或音频放大（LF）_功率放大（PA）
MJD44H11封装形式：贴片封装
MJD44H11极限工作电压：
MJD44H11最大电流允许值：8A
MJD44H11最大工作频率：<1MHZ或未知
MJD44H11引脚数：3
MJD44H11最大耗散功率：20W
MJD44H11放大倍数：
MJD44H11图片代号：G-217
MJD44H11vtest：0
MJD44H11htest：999900
MJD44H11atest：8
MJD44H11wtest：20

MJD44H11代换 MJD44H11用什么型号代替：

MJD44H价格

参考价格：￥1.4379

型号：MJD44H11-1G 品牌：ONSemi 备注：这里有MJD44H多少钱，2025年最近7天走势，今日出价，今日竞价，MJD44H批发/采购报价，MJD44H行情走势销售排行榜，MJD44H报价。

型号	功能描述	生产厂家&企业	LOGO
MJD44H11	SILICON POWER TRANSISTORS 8 AMPERES 80 VOLTS 20 WATTS ComplementaryPowerTransistors DPAKForSurfaceMountApplications ...forgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. •LeadFormedforSurfaceMountApplicationinPlasticS	MotorolaMotorola, Inc 摩托罗拉加尔文制造公司
MJD44H11	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	COMPLEMENTARY SILICON PNP TRANSISTORS MJD44H11T4-AMJD44H11-->NPN MJD45H11T4-AMJD45H11-->PNP Description Thedevicesaremanufacturedinlowvoltagemultiepitaxialplanartechnology.Theyareintendedforgeneralpurposelinearandswitchingapplications. Features ■Thedevicesarequalifiedforautomotiveapp	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11	General Purpose Power and Switching Such as Output or Driver Stages in Applications D-PAK for Surface Mount Applications GeneralPurposePowerandSwitchingSuchasOutputorDriverStagesinApplications D-PAKforSurfaceMountApplications •LoadFormedforSurfaceMountApplication(NoSuffix) •StraightLead(I-PAK,“-I”Suffix) •ElectricallySimilartoPopularMJE44H •FastSwitchingSpeeds	FairchildFairchild Semiconductor 仙童半导体飞兆/仙童半导体公司
MJD44H11	Complementary Power Transistors Features LeadFormedforSurfaceMountApplicationsinPlasticSleeves FastSwitchingSpeeds ComplementaryPairsSimplifiesDesigns Pb-FreePackagesareAvailable	KEXINGuangdong Kexin Industrial Co.,Ltd 科信电子广东科信实业有限公司
MJD44H11	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	80 V, 8 A NPN high power bipolar transistor 1.Generaldescription NPNhighpowerbipolartransistorinapowerDPAK,TO-252(SOT428C)Surface-MountedDevice (SMD)plasticpackage. PNPcomplement:MJD45H11 2.Featuresandbenefits •Highthermalpowerdissipationcapability •Highenergyefficiencyduetolessheatgeneration •Ele	NEXPERIANexperia B.V. All rights reserved 安世安世半导体(中国)有限公司
MJD44H11	isc Silicon NPN Power Transistors DESCRIPTION ·LowCollector-EmitterSaturationVoltage :VCE(sat)=1.0V(Max)@IC=8A ·FastSwitchingSpeeds ·ComplementtoTypeMJD45H11 ·DPAKforSurfaceMountApplications APPLICATIONS ·Designedforgeneralpurposepoweramplificationand switchingsuchasoutputordriverstagesinappl	ISCInchange Semiconductor Company Limited 无锡固电无锡固电半导体股份有限公司
MJD44H11	Gate Driver Description: M57161L-01isahybridintegratedcircuitdesignedfordrivingPowerexF-SeriesIGBTmodules.Thisgatedriverconvertslogiclevelcontrolsignalsintohighcurrentgatedrivewithsuitableonandoffbiasvoltages.Electricalisolationoftheinputcontrolsignalisprovidedbyan	POWEREX Powerex Power Semiconductors
MJD44H11_V01	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-001	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-1	SILICON POWER TRANSISTORS 8 AMPERES 80 VOLTS 20 WATTS ComplementaryPowerTransistors DPAKForSurfaceMountApplications ...forgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. •LeadFormedforSurfaceMountApplicationinPlasticS	MotorolaMotorola, Inc 摩托罗拉加尔文制造公司
MJD44H11-1G	Complementary Power Transistors ComplementaryPowerTransistors DPAKForSurfaceMountApplications Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationin	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-1G	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-252	isc Silicon NPN Power Transistors DESCRIPTION ·LowCollector-EmitterSaturationVoltage :VCE(sat)=1.0V(Max)@IC=8A ·FastSwitchingSpeeds ·ComplementtoTypeMJD45H11 ·DPAKforSurfaceMountApplications APPLICATIONS ·Designedforgeneralpurposepoweramplificationand switchingsuchasoutputordriverstagesinappl	ISCInchange Semiconductor Company Limited 无锡固电无锡固电半导体股份有限公司
MJD44H11A	80 V, 8 A NPN high power bipolar transistor 1.Generaldescription NPNhighpowerbipolartransistorinapowerDPAK,TO-252(SOT428C)Surface-MountedDevice (SMD)plasticpackage. PNPcomplement:MJD45H11A 2.Featuresandbenefits •Highthermalpowerdissipationcapability •Highenergyefficiencyduetolessheatgeneration •El	NEXPERIANexperia B.V. All rights reserved 安世安世半导体(中国)有限公司
MJD44H11G	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11G	Complementary Power Transistors ComplementaryPowerTransistors DPAKForSurfaceMountApplications Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationin	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11G	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RL	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RLG	Complementary Power Transistors ComplementaryPowerTransistors DPAKForSurfaceMountApplications Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationin	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RLG	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T4	SILICON POWER TRANSISTORS 8 AMPERES 80 VOLTS 20 WATTS ComplementaryPowerTransistors DPAKForSurfaceMountApplications ...forgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. •LeadFormedforSurfaceMountApplicationinPlasticS	MotorolaMotorola, Inc 摩托罗拉加尔文制造公司
MJD44H11T4	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T4-A	Complementary power transistors MJD44H11T4-AMJD44H11-->NPN MJD45H11T4-AMJD45H11-->PNP Description Thedevicesaremanufacturedinlowvoltagemultiepitaxialplanartechnology.Theyareintendedforgeneralpurposelinearandswitchingapplications. Features ■Thedevicesarequalifiedforautomotiveapp	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11T4G	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T4G	Complementary Power Transistors ComplementaryPowerTransistors DPAKForSurfaceMountApplications Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationin	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T4G	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T5	SILICON POWER TRANSISTORS Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •Pb−FreePackagesareAvailable •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •Stra	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T5G	Complementary Power Transistors ComplementaryPowerTransistors DPAKForSurfaceMountApplications Designedforgeneralpurposepowerandswitchingsuchasoutputordriverstagesinapplicationssuchasswitchingregulators,converters,andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationin	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T5G	Complementary Power Transistors Designedforgeneralpurposepowerandswitchingsuchasoutputor driverstagesinapplicationssuchasswitchingregulators,converters, andpoweramplifiers. Features •LeadFormedforSurfaceMountApplicationinPlasticSleeves (NoSuffix) •StraightLeadVersioninPlasticSleeves(“	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	Designed for general purpose power and switching 文件：302.13 Kbytes Page：2 Pages	RECTRON Rectron Semiconductor
MJD44H11	Complementary power transistors 文件：217.1 Kbytes Page：8 Pages	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11	Complementary Power Transistors 文件：114.33 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	Complementary Power Transistors 文件：97.32 Kbytes Page：9 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	Complementary Power Transistors SILICON POWER TRANSISTORS 8 AMPERES 文件：132.35 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11	isc Silicon NPN Power Transistors 文件：262.95 Kbytes Page：3 Pages	ISCInchange Semiconductor Company Limited 无锡固电无锡固电半导体股份有限公司
MJD44H11	COMPLEMENTARY SILICON PNP TRANSISTORS 文件：152.94 Kbytes Page：5 Pages	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11_03	COMPLEMENTARY SILICON PNP TRANSISTORS 文件：152.94 Kbytes Page：5 Pages	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11_06	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11_09	Complementary power transistors 文件：217.1 Kbytes Page：8 Pages	STMICROELECTRONICSSTMicroelectronics 意法半导体意法半导体集团
MJD44H11_09	NPN Epitaxial Silicon Transistor 文件：118.83 Kbytes Page：5 Pages	FairchildFairchild Semiconductor 仙童半导体飞兆/仙童半导体公司
MJD44H11_11	Complementary Power Transistors 文件：114.33 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11_13	Complementary Power Transistors SILICON POWER TRANSISTORS 8 AMPERES 文件：132.35 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11_16	Complementary Power Transistors 文件：97.32 Kbytes Page：9 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-001	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-001G	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-1G	Complementary Power Transistors 文件：97.32 Kbytes Page：9 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11-1G	封装/外壳：TO-251-3 短引线，IPak，TO-251AA 包装：卷带（TR）剪切带（CT）Digi-Reel® 得捷定制卷带描述：TRANS NPN 80V 8A IPAK 分立半导体产品晶体管 - 双极性晶体管（BJT）- 单个	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11AJ	封装/外壳：TO-252-3，DPak（2 引线 + 接片），SC-63 包装：剪切带（CT）带盒（TB）描述：TRANS NPN 80V 8A DPAK 分立半导体产品晶体管 - 双极性晶体管（BJT）- 单个	ETC 知名厂家	ETC
MJD44H11G	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11G	Complementary Power Transistors 文件：114.33 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11G	Complementary Power Transistors 文件：97.32 Kbytes Page：9 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11IP	Designed for general purpose power and switching 文件：302.13 Kbytes Page：2 Pages	RECTRON Rectron Semiconductor
MJD44H11RL	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RLG	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RLG	Complementary Power Transistors 文件：114.33 Kbytes Page：8 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11RLG	Complementary Power Transistors 文件：97.32 Kbytes Page：9 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司
MJD44H11T4	Complementary Power Transistors 文件：76.24 Kbytes Page：7 Pages	ONSEMION Semiconductor 安森美半导体安森美半导体公司

MJD44H产品属性

类型
描述
型号
MJD44H
功能描述
两极晶体管 - BJT 8A 80V 20W NPN
RoHS
否
制造商
STMicroelectronics
晶体管极性
PNP 集电极—基极电压
VCBO
集电极—发射极最大电压
VCEO
- 40 V 发射极 - 基极电压
VEBO
- 6 V
增益带宽产品fT
直流集电极/Base Gain hfe
Min
100 A
安装风格
SMD/SMT
封装/箱体
PowerFLAT 2 x 2

MJD44H供应商更多...

更新时间：2025-7-27 21:57:00

IC供应商	芯片型号	品牌	批号	封装	库存	备注	价格
深圳诚思涵科技有限公司	MJD44H11T4	ST	24+	TO-252-3	32350	深圳存库原装现货	询价
深圳市科恒伟业电子有限公司	MJD44H11T4G	ON	2450+	TO-252	6541	只做原装正品假一赔十为客户做到零风险!!	询价
深圳市汇莱威科技有限公司	MJD44H11T4	ST/意法	24+	TO-252	504574	免费送样原盒原包现货一手渠道联系	询价
深圳市明嘉莱科技有限公司	MJD44H11G	ON	25+	SMD	518000	明嘉莱只做原装正品现货	询价
深圳市得捷芯城科技有限公司	MJD44H11RLG	ON(安森美)	24+	TO-252-2(DPAK)	7348	原厂可订货,技术支持,直接渠道。可签保供合同	询价
深圳市恒凯威科技开发有限公司	MJD44H11-1G	ON/安森美	21+	TO-252	20000	只做原装,质量保证	询价
深圳市恒达亿科技有限公司	MJD44H11T4G	ON	25+	TO-252	6000	全新原装现货、诚信经营!	询价
深圳市坤融电子科技有限公司	MJD44H11TF	FAIRCHILD/仙童	24+	TO252	8950	BOM配单专家,发货快,价格低	询价
标准国际(香港)有限公司	MJD44H11RLG	ONSEMI	2021	NA	12600	全新原装!优势库存热卖中!	询价
深圳市向鸿伟业电子有限公司	MJD44H11-1G	ON/安森美	2410+		80000	原装正品.假一赔百.正规渠道.原厂追溯.	询价

MJD44H芯片相关品牌

MJD44H规格书下载地址

MJD44H参数引脚图相关

MJD44H数据表相关新闻

MJD50G只供应原装，现货价低
MJD50G只供应原装，现货价低
2024-6-7
MJD45H11J 双极晶体管 - 双极结型晶体管(BJT)
MJD45H11J双极晶体管-双极结型晶体管(BJT)MJD45H11/SOT428/DPAK
2023-4-25
MJD44H11RLG 双极晶体管 - 双极结型晶体管(BJT) 8A 80V 20W NPN 进口原装正品
MJD44H11RLG
2022-6-13
MJD32CT4G
MJD32CT4G，全新.当天发货或门市自取，如需了解更多产品信息联系我们.零七五五.八二七三二二九一企鹅:一一七四零五二三五三，V:八七六八零五五八.
2021-7-1
MJD127T4 ON原厂授权经销商
进口原装，国产代理，海量库存，产品齐全，货源渠道百分百正品
2020-6-18
mjd31ct4g亚太地区代理商，绝对优势！！
深圳市拓亿芯电子正品销售mjd31ct4g
2019-11-1

DdatasheetPDF页码索引

P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
P22
P23
P24
P25
P26
P27
P28
P29
P30
P31
P32
P33
P34
P35
P36
P37
P38
P39
P40
P41
P42
P43
P44
P45
P46
P47
P48
P49
P50
P51
P52
P53
P54
P55
P56
P57
P58
P59
P60
P61
P62
P63
P64
P65
P66
P67
P68
P69
P70
P71
P72
P73
P74
P75
P76
P77
P78
P79
P80
P81
P82
P83
P84
P85
P86
P87
P88
P89
P90
P91
P92
P93
P94
P95
P96
P97
P98
P99
P100
P101
P102

您好,欢迎来到114ic资料网！

MJD44H晶体管资料

MJD44H价格

MJD44H产品属性

MJD44H供应商更多...

MJD44H芯片相关品牌

MJD44H规格书下载地址

MJD44H参数引脚图相关

MJD44H数据表相关新闻

MJD50G只供应原装，现货价低

MJD45H11J 双极晶体管 - 双极结型晶体管(BJT)

MJD44H11RLG 双极晶体管 - 双极结型晶体管(BJT) 8A 80V 20W NPN 进口原装正品

MJD32CT4G

MJD127T4 ON原厂授权经销商

mjd31ct4g亚太地区代理商，绝对优势！！

DdatasheetPDF页码索引