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Protected digital input termination with serialized state transfer
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The SCLT3-8BT8 provides an 8-line protected digital input termination with serialized state transfer. This device enhances the I/O module density by cutting the dissipation (78 mW per input) and reducing the count of opto-transistors. An adjustable digital filter and an LED driver are embedded in each type 3 input section. Its 2 MHz SPI peripheral output serializes the input state transfer to the I/O module controller.

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Errata Sheet
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Key Features

  • 8-input circuit in common ground low side topology
  • Wide range input DC voltage VI : -30 V to 35 V
  • On state threshold: < 11 V with RI = 2.2 kW
  • Off state threshold: IIN > 1.5 mA or VI > 5 V
  • Protected against -30 V reverse polarity
  • 2.35 mA active current limiter with 10% tolerance
  • Drastic dissipation reduction: 78 mW max. per input
  • Input digital filter with adjustable delay: 20 μs to 3 ms
  • Energy-less LED visual status driver
  • Input logic state transfer through a 2 MHz SPI
  • Programmable 8 / 16-bit register length
  • Multi SCLT connection in daisy chain
  • Chip temperature OTA and under voltage UVA alarms
  • Multi parity bits and power loss detection with stop bits
  • Drastic reduction of isolated coupler count and I/O of the field bus ASIC
  • Power supply and input protection, RI = 2.2 kW:
  • IEC 61000-4-4 transient burst: ±4 kV minimum
  • IEC 61000-4-5 voltage surge: ±1 kV minimum
  • IEC 61000-4-2 ESD: ±8 kV in contact: ± 15 kV in air minimum
  • Wide range power supply voltage VC:
  • +9 V to +35 V with 10 mA output current
  • Protected against -30 V reverse polarity

线路 图表

图案 资源


Technical Documentation

Product Specifications

描述 版本 大小
DS5978: Protected digital input termination with serialized state transfer
6.0 702 KB

Application Notes

描述 版本 大小
AN2846: SCLT3-8 - guidelines for use in industrial automation applications
1.2 1,077 KB
AN3031: SCLT3-8 input termination demonstration board STEVAL-IFP007V1
1.2 1,372 KB

Technical Notes & Articles

描述 版本 大小
TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches
3.1 333 KB

Related Tools and Software

Related Tools and Software

产品型号 描述
STEVAL-IFP007V1 16-bit PLC digital input card demonstration board based on the SCLT3

Publications and Collaterals


描述 版本 大小
Current-limiting terminations for automation digital inputs
1.0 401 KB

Selection Guides

描述 版本 大小
Protection devices and integrated EMI filtering selection guide
1,537 KB


描述 版本 大小
Products and Solutions for Factory Automation and Control
Jan 2015 3,105 KB

样品 & 购买

产品型号 Marketing StatusPackagePacking TypeOrder From STUnit Price (US$)*
@ 10
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SCLT3-8BT8ActiveHTSSOP38Tube-2.883Distributor reported inventory date: 2016-02-11
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE831
SCLT3-8BT8-TRActiveHTSSOP38Tape And Reel-2.883No availability reported, please contact our Sales officeEcopack2-

(*) 建议零售价格仅用于预算,以美元为单位,每。的报价,以当地货币计算的价格,请联系您当地的 ST 销售办事处 或我们的 分销商
(**) 材料声明表格上提供st.com可以是一般的文件,根据最常用的包,包内的家庭。出于这个原因,他们可能不是100%准确,对于一个特定的设备。请联系我们 销售支持 在特定设备上的信息。
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