芯天下
TE Connectivity Ltd.

TE Connectivity Ltd.- 多通道输入模块

TE Connectivity (泰科电子) 是一家全球性工业技术领先企业,致力于创造更安全、可持续、高效和互联的未来。公司前身为泰科国际的一部分,于2007年独立为泰科电子,2011年更名为TE Connectivity。总部位于瑞士沙夫豪森,运营总部设在美国,TE 设计制造逾50万种产品,连接和保护电力和数据流动。产品系列涵盖连接器、传感器、继电器、天线、热缩套管和电缆组件,旗下品牌包括 AMP、DEUTSCH、Raychem 等。公司服务汽车、工业设备、数据通信、航空航天、国防、医疗和能源等众多市场。其连接器和传感器解决方案在电动汽车、自动驾驶、云计算和智能工厂等应用中发挥关键作用。TE Connectivity 在纽约证券交易所公开上市,股票代码 TEL。全球员工约9万人,年销售额约133亿美元。TE 于1989年进入中国,现拥有约38,000名员工,设有16个生产基地和14个销售办事处,由中国注册实体泰科电子(上海)有限公司管理在华业务。作为市场领导者,TE 在全球连接器和传感器市场占据领先份额,持续以更智能、更快速、更出色的技术赋能客户。

03

多通道输入模块 - 型号列表

21 个型号

零件号别名

行业别名

输入偏置电流(最大)

标准包装数量

额定电压

其他名称

系列

产品子类型

海关税号

零件状态

RoHS

输出类型

输出电流

最大额定电流

最小输入电压

供电电压 (Vcc/Vdd)

适配器系列

工厂包装数量

VSWR

调谐电压 (VDC)

绝缘电阻

工作温度

输出范围

通道数量

输入电阻

输入偏置电流

重量

制造商全称

附件类型

交货时间

子类别

产品类别

输出端

压摆率

开启时间

关断延迟时间

颜色

腔体A

封装体颜色

外壳材料(壳体)

面板尺寸

外部壳体颜色

类型

样式

产品特性

包装方式

供电电压

深度

宽度

长度

制造商零件编号库存价格标准包装数量样式RoHS额定电压系列工作温度交货时间子类别零件号别名产品类别开启时间输出电流关断延迟时间最小输入电压输入偏置电流(最大)颜色类型行业别名输出端输出类型最大额定电流封装体颜色端接样式产品特性工厂包装数量隔离绝缘电阻产品子类型深度宽度长度VSWR压摆率耦合系数连接器阻抗调谐电压 (VDC)供电电压 (Vcc/Vdd)腔体A外壳材料(壳体)面板尺寸外部壳体颜色第一连接器安装类型继电器类型装配配置I/O 数量附件类型适配器系列海关税号重量典型触点布局通道数量其他名称零件状态模拟输入/输出制造商全称有铅工艺兼容输出功能Q值 @ Vr, F输出范围供电电压输入偏置电流安装样式主要材料尺寸/外形连接类型模块/板类型包装方式标准输入类型漏电流输入电阻隔离电压最大持续工作电压(MCOV)适用产品/相关产品安装类型连接器类型机械寿命无铅定义RoHS/ELV合规状态端子类型位数设计类型
OAC-24A
4

I/O Modules SPST-NO 3A 24VDC I/O SS RELAY OUTPUT MODULE AC STD 13MA 24VDC I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. OAC-24A=IO MODULES

TE Connectivity / P&B

3751: ¥97.92100StandardRoHS Compliant24 VDCOAC-30 – 8094 DaysI/O Module2-1393028-5I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (240VAC Nom)13mABlackAC2-1393028-5, OAC-24AAC交流3BlackPC TerminalsHold Down Screw100-4000----280光学1 Form A (SPST-NO)2418 – 32.05工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]黑色印刷电路板固态1 Form A (SPST-NO)------------.05 – 324 – 280------------------------
ODC-15
5

I/O Modules SPST-NO 3Amps OUTPUT MODULE DC STD 16MA 15VDC I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole Product Highlights:RelayRelay Type = Solid State - Input/Output ModuleODC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 A ODC-15=IO MODULES

TE Connectivity / P&B

1051: ¥287.436100StandardRoHS Compliant15 VDCODC-30 – 8094 DaysI/O Module4-1393028-1I/O Modules0.10ms3 A0.75ms3 ~ 60VDC16mARedDC4-1393028-1, ODC-15DC直流3RedPC TerminalsHold Down Screw1004000 V4000DC Output Modules---60光学1 Form A (SPST-NO)159 – 18.01工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]红色印刷电路板固态1 Form A (SPST-NO)-----------------------Bulk---------------
OACM-5H
9

I/O Modules 5VDC input 5A 24-280AC out Blk OUTPUT MODULE AC MINI 20MA 5VDC Module,Ctrl,Output,Digital,CircuitBoard I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOACM SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 5 Amps. I/O MODULE Module,Control,Output,Digital,CircuitBoard,20mA,5VDC,PCB,OACMSeries OACM-5H=IO MODULES

TE Connectivity / P&B

3881: ¥146.812200MiniIn Transition5 VDCOACM+80°C94 DaysI/O Module4-1393028 4-1393028-0I/O Modules8.33ms5 A8.33ms24 ~ 280VAC (120VAC Nom)20 mABlackAC4-1393028-0, OACM-5HACAnalogue:5ABlackPC TerminalsOpticalIsolation2004000 V100Megaohms(Min.)@500VDC-31.8mm15.2mm43.2mm-------------1:AC Output ModuleOACM853641100.018:SPST-NO1-4-1393028-0:1OACMSeries:Yes---24to280VAC5VDC20mAPCBModule43.2L×15.2W×31.8HmmCircuitBoardControl-ULRecognized,CSACertifiedDigital1mA(RMS)(Max.)@120VAC220Ohms4000VAC3VDC(Max.)---------
OAC-5
8

I/O Modules 5VDC input 3A 24-280AC out Blk OUTPUT MODULE AC STD 20MA 5VDC Module,Ctrl,Output,Digital,CircuitBoard I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. I/O MODULE Module,Control,Output,Digital,CircuitBoard,20mA,5VDC,PCB,OACSeries OAC-5=I/O MOD,OUTPUT,AC,5V,PUR

TE Connectivity / P&B

2221: ¥97.92100StandardIn Transition5 VDCOAC+80°C94 DaysI/O Module6-1393028-9I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (120VAC Nom)6 ABlackAC6-1393028-9, OAC-5ACDigital:3ABlackPC TerminalsHold Down Screw1004000 V--31.8mm15.2mm43.2mm-------------1:AC Output ModuleOAC854110000:SPST-NO------------------------:TE Connectivity Solid State Relays--------
OACM-UH
9

I/O Modules 3-15VDC Input 5A 24-280AC out Blk OUTPUT MODULE AC 44MA 15VDC Module,Ctrl,Output,Digital,CircuitBoard I/O Module Relays Output Module 15VDC 44mA 4000Vrms Thru-Hole I/O Module Relays Output Module 15VDC 44mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOACM SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 5 Amps. I/O MODULE Module,Control,Output,Digital,CircuitBoard,5A,5VDC,PCB,OACMSeries TE Connectivity 5 A 有效值 单极常开 接口继电器模块, 三端双向可控硅开关元件输出, 交流/直流切换, 280V有效值 OACM-UH=I/O MOD,OUTPUT,AC,3-15-

TE Connectivity / P&B

3941: ¥146.812200MiniRoHS Compliant3 VDC to 15 VDCOACM+80°C94 DaysI/O Module7-1393028-2I/O Modules8.33ms5 A8.33ms24 ~ 280VAC (120VAC Nom)44 mABlackAC7-1393028-2, OACM-UHACDigital:5ABlackPC Terminals-2004000 V100Megohms(Min.)@500VDCDC Input Modules31.8mm15.2mm43.2mm-------------1:AC Output ModuleOACM854110000.018:SPST-NO17-1393028-27-1393028-2:1OACMSeries:Yes---280V5VDC5APCBModule43.2L×15.2W×31.8HmmCircuitBoardControl-ULRecognized,CSACertified-1mA(RMS)(Max.)@120VAC360Ohms(Typ.)-3VDC(Max.)---------
OAC-5A
8

I/O Modules 5VDC input 3A 24-280AC out Blk OUTPUT MODULE AC STD 20MA 5VDC ModuleControl,Ouput,Digital,CircuitBoard I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. I/O MODULE Module,Control,Ouput,Digital,CircuitBoard,20mA,5VDC,PCB,OACSeries OAC-5A=IO MODULES

TE Connectivity / P&B

2831: ¥97.92100StandardRoHS Compliant5 VDCOAC+80°C94 DaysI/O Module2-1393028-8I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (240VAC Nom)6 ABlackAC2-1393028-8, OAC-5AACDigital:3ABlackPC TerminalsHold Down Screw1004000 V--31.8mm15.2mm43.2mm-------------1:AC Output ModuleOAC853710990.027:SPST-NO---:1-:Yes-----------Tray---------------
2IOM16

Relay Sockets & Hardware MNT Boards for Slim Line I/O Modules I/O MOUNTING BOARD MINI 16POS Space Saving Mounting Boards For Slim Line Input/Output Modules Space Saving Mounting Boards For Slim Line Input/Output Modules Product Highlights:2IOM Series16 I/O Channels16 Module PositionsLogic Terminals = 50-Pin Card Edge ConnectorNegative True Logic; One Logic Voltage

TE Connectivity / P&B

101: ¥712.1645MiniLead free / RoHS non-compliant-2IOM-365 DaysMisc Products1393026-1Relay Sockets & Hardware-------1393026-1, 2IOM16------1--------------------Mounting Board----161393026-1---------------Bulk-------Standoffs50 pos Card Edge and Screw Terminal BlocksObsolete-----
ODC-15A
5

I/O Modules SPST-NO 1A 15VDC I/O SS RELAY OUTPUT MODULE DC STD 16MA 15VDC I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole Product Highlights:RelayRelay Type = Solid State - Input/Output ModuleODC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 1 Amps. ODC-15A=IO MODULES

TE Connectivity / P&B

491: ¥352.104100StandardRoHS Compliant15 VDCODC-30 – 8094 DaysI/O Module4-1393028-2I/O Modules0.10ms1 A0.75ms3 ~ 250VDC16mARedDC4-1393028-2, ODC-15ADC直流1RedPC TerminalsHold Down Screw-4000 V4000----250光学1 Form A (SPST-NO)159 – 18.01工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]红色印刷电路板固态1 Form A (SPST-NO)-------4-1393028-2-------------------------------
OACM-U
5

I/O Modules 3-15VDC BLACK OUTPUT MODULE AC 44MA 15VDC I/O Module Relays Output Module 15VDC 44mA 4000Vrms Thru-Hole I/O Module Relays Output Module 15VDC 44mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOACM SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. OACM-U=IO MODULES

TE Connectivity / P&B

7381: ¥97.92200MiniRoHS Compliant3 VDC to 15 VDCOACM-30 – 8094 DaysI/O Module3-1393028-1I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (120VAC Nom)44 mABlackAC3-1393028-1, OACM-UAC交流3BlackPC Terminals-2004000 V4000----280光学1 Form A (SPST-NO)53 – 15.05超薄43.2 x 10.2 x 25.4 mm [ 1.702 x .401 x 1 in ]黑色印刷电路板固态1 Form A (SPST-NO)------------.05 – 324 – 280------------------------
OACM-5
9

I/O Modules AC input 5VDC 3A 24-280AC out Blk OUTPUT MODULE AC MINI 20MA 5VDC Module,Ctrl,Output,Digital,CircuitBoard I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 20mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOACM SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. I/O MODULE Module,Control,Output,Digital,CircuitBoard,20mA,5VDC,PCB,OACMSeries OACM-5=IO MODULES-

TE Connectivity / P&B

251: ¥135.90200MiniRoHS Compliant By Exemption5 VDCOACM+80°C94 DaysI/O Module3-1393028-8I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (120VAC Nom)20 mABlackAC3-1393028-8, OACM-5ACAnalogue:3ABlackPC TerminalsOpticalIsolation2004000 V100Megohms(Min.)@500VDCAC Input Modules31.8mm15.2mm43.2mm-------------1:AC Output ModuleOACM854110000:SPST-NO1-3-1393028-8-OACMSeries----24to280VAC5VDC20mAPCBModule43.2L×15.2W×31.8HmmCircuitBoardControl-ULRecognized,CSACertifiedDigital1mA(RMS)(Max.)@120VAC220Ohms(Typ.)4000VAC3VDC(Max.):TE Connectivity Solid State Relays--------
OAC-24
5

I/O Modules 24VAC BLACK OUTPUT MODULE AC STD 13MA 24VDC I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. MODULE,ACOUTPUT,24VDC,3A,SPST-NO,BLACKCASE OAC-24=IO MODULES

TE Connectivity / P&B

711: ¥112.54100StandardRoHS Compliant24 VDCOAC-30 – 8094 DaysI/O Module2-1393028-4I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (120VAC Nom)13mABlackAC2-1393028-4, OAC-24AC交流3BlackPC TerminalsHold Down Screw1004000 V4000AC Output Modules---280光学1 Form A (SPST-NO)2418 – 32.05工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]黑色印刷电路板固态1 Form A (SPST-NO)--------2-1393028-4---.05 – 324 – 280------------------------
OAC-15A
4

I/O Modules MODULE I/O 3A 15VDC OUTPUT MODULE AC STD 16MA 15VDC I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole I/O Module Relays Output Module 18VDC 16mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. OAC-15A=I/O MOD,OUTPUT,AC,15V,

TE Connectivity / P&B

841: ¥156.196100StandardLead free / RoHS non-compliant15 VDCOAC-30 – 8094 DaysI/O Module6-1393028-7I/O Modules8.33ms3 A8.33ms24 ~ 280VAC (240VAC Nom)16mABlackAC6-1393028-7, OAC-15AAC交流3BlackPC TerminalsHold Down Screw-4000 V4000AC Output Modules---280光学1 Form A (SPST-NO)159 – 18.05工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]黑色印刷电路板固态1 Form A (SPST-NO)-------6-1393028-7----.05 – 324 – 280------------------------
ODC-5A
4

I/O Modules MODULE I/O 1A 5VDC OUTPUT MODULE DC STD 18MA 5VDC I/O Module Relays Output Module 8VDC 18mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 18mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleODC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 1 Amps. ODC-5A=IO MODULES

TE Connectivity / P&B

1751: ¥147.696200StandardLead free / RoHS non-compliant5 VDCODC-30 – 8094 DaysI/O Module4-1393028-5I/O Modules0.10ms1 A0.75ms3 ~ 250VDC18mARedDC4-1393028-5, ODC-5ADC直流1RedPC TerminalsHold Down Screw-4000 V4000DC Output Modules---250光学1 Form A (SPST-NO)53 – 8.01工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]红色印刷电路板固态1 Form A (SPST-NO)-------4-1393028-5-------------------------------
ODC-24A
3

I/O Modules MODULE I/O 1A 24VDC OUTPUT MODULE DC STD 13MA 24VDC ODC-24A=I/O MOD,OUTPUT,DC,24V,

TE Connectivity / P&B

4251: ¥217.44100StandardLead free / RoHS non-compliant24 VDCODC-30 – 8094 DaysI/O Module7-1393028-6I/O Modules0.10ms1 A0.75ms3 ~ 250VDC13mARedDC7-1393028-6, ODC-24ADC直流1RedPC TerminalsHold Down Screw100-4000----250光学1 Form A (SPST-NO)2418 – 32.01工业标准43.2 x 15.2 x 31.8 mm [ 1.702 x .598 x 1.252 in ]红色印刷电路板固态1 Form A (SPST-NO)---------------------------------------
ODC-5
7

Input/Output Modules 4-Pin I/O Modules 5VDC input 3A 3-60VDC out Red OUTPUT MODULE DC STD 18MA 5VDC I/O Module Relays Output Module 8VDC 18mA 4000Vrms Thru-Hole I/O Module Relays Output Module 8VDC 18mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleODC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. I/O MODULE ODC-5=IO MODULES

te connectivity / p&b

501: ¥125.188TraysStandardRoHS Compliant5 VDCODC-30 to 80 °C94 DaysI/O Module4-1393028-4I/O Modules0.10ms3 A0.75ms3 ~ 60VDC18 mARedDC4-1393028-4, ODC-5DC-:3ARedPC TerminalsHold Down Screw1004000 V-DC Input Modules:15.2mm:43.18mm:31.8mm--------------:DC Output Module-853590000.027:SPST-NO---:1-:Yes---------------------------
ODC-24
10

Input/Output Modules 4-Pin I/O Modules 24VDC input 3A 3-60VDC out Red OUTPUT MODULE DC STD 13MA 24VDC Module,Control,Output,Digital,13mA,24VDC I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleODC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 3 Amps. I/O MODULE Module,Control,Output,Digital,13mA,24VDC,PCB,HoldDownScrew,ODCSeries TE Connectivity 3 A PCB(印刷电路板)安装安装 单极常开 接口继电器模块, 晶体管输出, 直流切换, 60 V 直流 ODC-24=I/O MOD,OUTPUT,DC,24V,P

te connectivity / p&b

151: ¥125.188BulkStandardRoHS Compliant24 VDCODC-30 to 80 °C94 DaysI/O Module7-1393028-5I/O Modules0.10ms3 A0.75ms3 ~ 60VDC13mARedDC7-1393028-5, ODC-24DCDigital:3ARedPC TerminalsHold Down Screw1004000 V-DC Output Modules31.8mm15.2mm43.2mm-------------1:DC Output ModuleODC850431800.027:SPST-NO1-7-1393028-5:1ODCSeries:Yes---3to60VDC24VDC13mAPCBModule43.2L×15.2W×31.8HmmCircuitBoardControl-----4000VAC----------
1393026-8
2

I/O MOUNTING BRD STANDARD 16POS Solid State Relays Mounting Boards For Input/Output Modules, 16 Positions 50 Pin Mounting Boards For Input/Output Modules, 16 Positions 50 Pin Product Highlights:Mounting Board2IO Series16 I/O Channels16 Module PositionsLogic Terminals = 50-Pin Card Edge ConnectorSearch Keywords:switching function, industrial automation systems, mounting boards,

TE Connectivity

211: ¥1,256.8441StandardLead free / RoHS non-compliant-2IO----------------------Mounting Board----------------------16.0---Potter & Brumfield--------------------Standoffs50 pos Card Edge and Screw Terminal Blocks-Not relevant for lead free processNot ELV/RoHS compliant50-Pin Card Edge Connector16.0Negative True Logic; One Logic Voltage
OAC-24H

OUTPUT MODULE AC STD 13MA 24VDC I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole I/O Module Relays Output Module 32VDC 13mA 4000Vrms Thru-Hole Product Highlights:Input/Output ModuleRelay Type = Solid State Input/Output ModuleOAC SeriesSwitch Arrangement = 1 Form A (SPST-NO)Current Rating = 5 Amps.

TE Connectivity

241: ¥161.636100Standard--------8.33ms0.05 ~ 5A8.33ms24 ~ 280VAC (120VAC Nom)13mABlackAC------Hold Down Screw---------------------------2-1393028-6-------------------------------
OAC15

ModuleControl,OutputDigital,CircuitBoard Module,Control,OutputDigital,CircuitBoard,16mA,15VDC,PCB,OACSeries

TE Connectivity

101: ¥130.288---9 V dc-+80°C-------------Digital--------31.8mm15.2mm43.2mm-------------1-OAC------------------------------------
IAC5

ModuleControl,Input,Digital,CircuitBoard Module,Control,Input,Digital,CircuitBoard,6mA,5VDC,PCB,IACSeries

TE Connectivity

101: ¥119.272---90 → 140 V ac/dc-+80°C----------------------31.8mm15.2mm43.2mm-------------1-IAC----------------------Digital-------------
1 / 2
1