371代换资料datasheet下载货源供应商报价百通-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

数据手册
丝印反查
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1395页 > 371

371晶体管资料

371别名：371三极管、371晶体管、371晶体三极管
371生产厂家：美国无线电公司
371制作材料：Si-NPN
371性质：低频或音频放大（LF）_功率放大（PA）
371封装形式：直插封装
371极限工作电压：40V
371最大电流允许值：5A
371最大工作频率：<1MHZ或未知
371引脚数：3
371最大耗散功率：40W
371放大倍数：
371图片代号：B-12
371vtest：40
371htest：999900
371atest：5
371wtest：40

371代换 371用什么型号代替：

371价格

参考价格：￥2.4522

型号：371 品牌：RENATA 备注：这里有371多少钱，2025年最近7天走势，今日出价，今日竞价，371批发/采购报价，371行情走势销售排行榜，371报价。

型号	功能描述	生产厂家&企业	LOGO
371	3M??Scotch짰 Industrial Box Sealing Tape 371 文件：570.25 Kbytes Page：4 Pages	3M	3M
371	包装：散装描述：SOLDERING IRON HOLDER 焊接，拆焊，返修产品支座，支架	PanaVise	PanaVise
371	包装：散装描述：PULL ACTION LATCH CLAMP 工业自动化与控制工业设备	ETC 知名厂家	ETC
37100	Lead Wire, #2/0 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2/0AWG (504x26) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
371000	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
37100-010100	Lead Wire, #2/0 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2/0AWG (504x26) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37100-010250	Lead Wire, #2/0 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2/0AWG (504x26) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37100-01050	Lead Wire, #2/0 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2/0AWG (504x26) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37100-010500	Lead Wire, #2/0 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2/0AWG (504x26) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
371001	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
371002	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
37101	Lead Wire, #1 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 1AWG (210x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37101-010100	Lead Wire, #1 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 1AWG (210x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37101-0101000	Lead Wire, #1 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 1AWG (210x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37101-010250	Lead Wire, #1 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 1AWG (210x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37102	Lead Wire, #2 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2AWG (163x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37102-010100	Lead Wire, #2 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2AWG (163x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37102-0101000	Lead Wire, #2 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2AWG (163x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37102-010250	Lead Wire, #2 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 2AWG (163x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37103	Lead Wire, #3 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 3AWG (133x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37103-010100	Lead Wire, #3 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 3AWG (133x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37103-010250	Lead Wire, #3 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 3AWG (133x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37104	Lead Wire, #4 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 4AWG (105x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37104-010100	Lead Wire, #4 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 4AWG (105x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37104-0101000	Lead Wire, #4 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 4AWG (105x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37104-010250	Lead Wire, #4 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 4AWG (105x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37104-010500	Lead Wire, #4 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 4AWG (105x24) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37106	Lead Wire, #6 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 6AWG (84x25) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37106-010100	Lead Wire, #6 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 6AWG (84x25) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37106-010250	Lead Wire, #6 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 6AWG (84x25) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37106-0102500	Lead Wire, #6 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 6AWG (84x25) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37106-010500	Lead Wire, #6 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 6AWG (84x25) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37108	Lead Wire, #8 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 8AWG (84x27) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37108-010250	Lead Wire, #8 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 8AWG (84x27) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37108-0102500	Lead Wire, #8 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 8AWG (84x27) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37108-010500	Lead Wire, #8 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 8AWG (84x27) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
3710M-E1	LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER General Description The AP3710 is a green-mode PWM controller, its main applications are low power supplies such as offline battery chargers, adapters, STB and other auxiliary supplies, where the needs for low no load power, low total cost and high reliability are all required. Features	BCDSEMI 新进半导体	BCDSEMI
37110	Lead Wire, #10 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 10AWG (65x28) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
371100	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
37110-0102000	Lead Wire, #10 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 10AWG (65x28) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37110-010500	Lead Wire, #10 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 10AWG (65x28) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37110-0105000	Lead Wire, #10 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 10AWG (65x28) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
371101	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
371102	WE-EMIP EMI Patch General Information: Operating Temperature -25 up to +105 °C Storage Conditions (in original packaging) 0 °C up to + 40 °C; up to 75 % RH Moisture Sensitivity Level (MSL) 1	WURTHWurth Elektronik GmbH & Co. KG, Germany. 伍尔特伍尔特集团	WURTH
37112	Lead Wire, #12 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 12AWG (65x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37112-002500	Lead Wire, #12 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 12AWG (65x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37112-0103000	Lead Wire, #12 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 12AWG (65x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37112-010500	Lead Wire, #12 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 12AWG (65x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37112-0105000	Lead Wire, #12 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 12AWG (65x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
371-1399-C	371-1399 Sun Oracle Compatible Transceiver SFP 10/100/1000Base-T (RJ45, Copper, 100m) Features ATGBICS 371-1399 SFP operates on standard Category 5 unshielded twisted-pair copper cabling of link lengths up to 100m. Sun Oracle 1000BASE-T SFP modules support 10/100/1000 auto negotiation and auto MDI/MDIX. Our product meets the specification of Sun Oracle 371-1399= and we proudly o	ATGBICS	ATGBICS
37114	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37114-0024000	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37114-002500	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37114-0104000	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37114-010500	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37114-0105000	Lead Wire, #14 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 14AWG (41x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37116	Lead Wire, #16 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 16AWG (26x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37116-002500	Lead Wire, #16 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 16AWG (26x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37116-004500	Lead Wire, #16 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 16AWG (26x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN
37116-005500	Lead Wire, #16 Str TC, EPDM Ins, AWM 3340 AWM 3374 Product Description Rubber Lead Wire, 16AWG (26x30) Tinned Copper, EPDM Insulation, AWM 3340 AWM 3374 CSA TYPE CL1254 600V 125C FLEX 150C NO FLEX	BELDEN 百通	BELDEN

371产品属性

类型
描述
型号
371
功能描述
折皱器 DSUB HAND TOOL KIT FLAT CABLE
RoHS
否
制造商
Hirose Connector
描述/功能
Cable and Shield Crimper

371供应商更多...

更新时间：2025-8-8 20:00:00

IC供应商	芯片型号	品牌	批号	封装	库存	备注	价格
深圳市得捷芯城科技有限公司	371A	TI/德州仪器	24+	NA/	3550	原装现货,当天可交货,原型号开票	询价
深圳市科芯源微电子有限公司	3711-007975	NQKQ	25+	SMD	54648	百分百原装现货实单必成欢迎询价	询价
深圳市益百分电子有限公司	37102WR	MIC	05+	SOT263/5	3300	全新原装进口自己库存优势	询价
深圳市华睿芯科技有限公司	371A	DUREL	24+	MSOP-10	20000	全新原厂原装，进口正品现货，正规渠道可含税！！	询价
深圳市羿芯诚电子有限公司	3711R		23+	BGA	3220	原装正品公司现货价格优惠欢迎查询	询价
深圳市永贝尔科技有限公司	3710EFE	LINER	23+	NA	25060	只做进口原装,终端工厂免费送样	询价
深圳市星宇佳科技有限公司	37112M-RC007	NA	11+	SOP20	352		询价
深圳市佳鑫美电子科技有限公司	37122I		24+	TSOP16	3629	原装优势!房间现货!欢迎来电!	询价
深圳市科恒伟业电子有限公司	3710013	F	1950+	CDIP14	980	只做原装正品现货!或订货假一赔十!	询价
千层芯半导体(深圳)有限公司	3718401	Honeywell	24+	原厂原装	6000	进口原装正品假一赔十,货期7-10天	询价

371芯片相关品牌

371规格书下载地址

371参数引脚图相关

371数据表相关新闻

368482-2
368482-2
2024-4-12
385910-043
优势渠道
2023-4-24
385911-015
优势渠道
2023-4-24
3-829868-3
3-829868-3
2020-10-19
36TXHE12
36TXHE12，全新原装当天发货或门市自取0755-82732291.
2020-3-13
36TXHE22
36TXHE22，全新原装当天发货或门市自取0755-82732291.
2020-3-13

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
P103

您好,欢迎来到114ic资料网！

371晶体管资料

371价格

371产品属性

371供应商更多...

371芯片相关品牌

371规格书下载地址

371参数引脚图相关

371数据表相关新闻

368482-2

385910-043

385911-015

3-829868-3

36TXHE12

36TXHE22

DdatasheetPDF页码索引