ISO121x Digital Input Receivers

Texas Instruments' ISO1211 and ISO1212 isolated 24 V to 60 V digital input receivers are ideal for digital input modules

Image of Texas Instruments' ISO121x Digital Input ReceiversTexas Instruments' ISO1211 and ISO1212 devices are isolated 24 V to 60 V digital input receivers, compliant to IEC 61131-2 Type 1, 2, and 3 characteristics, suitable for programmable logic controllers (PLCs) and motor-control digital input modules. Unlike traditional optocoupler solutions with discrete, imprecise current limiting circuitry, the ISO121x devices provide a simple, low-power solution with an accurate current limit to enable the design of compact and high-density I/O modules. These devices do not require field-side power supply and are configurable as sourcing or sinking inputs.

The ISO121x devices operate over the supply range of 2.25 V to 5.5 V, supporting 2.5 V, 3.3 V, and 5 V controllers. A ±60 V input tolerance with reverse polarity protection helps ensure the input pins are protected in case of faults with negligible reverse current. These devices support up to 4 Mbps data rates passing a minimum pulse width of 150 ns for high-speed operation. The ISO1211 device is ideal for designs that require channel-to-channel isolation and the ISO1212 device is ideal for multichannel space-constrained designs.

The ISO121x devices reduce component count, simplify system design, and reduce board temperatures compared to traditional solutions. For details, refer to TI's Technote How To Simplify Isolated 24 V PLC Digital Input Module Designs.

  • Compliant to IEC 61131-2 Type 1, 2, and 3 characteristics
  • Accurate current limit for low-power dissipation:
    • 2.2 mA to 2.47 mA for Type 3
    • Adjustable up to 6.5 mA
  • Eliminates the need for field-side power supply
  • High input-voltage range with reverse polarity protection: ±60 V
  • Configurable as sourcing or sinking input
  • High data rates: up to 4 Mbps
  • High transient immunity: ±70 kV/µs CMTI
  • Wide supply range (VCC1): 2.25 V to 5.5 V
  • Ambient temperature range: -40°C to +125°C
  • Compact package options:
    • Single-channel ISO1211, SOIC-8
    • Dual-channel ISO1212, SSOP-16
  • Safety-related certifications:
    • Basic insulation per DIN V VDE V 0884-10
    • UL 1577 recognition, 2500 VRMS insulation
    • CSA, CQC, TUV certificates available
  • Programmable logic controller (PLC)
    • Digital input modules
    • Mixed I/O modules
  • Motor drive I/O and position feedback
  • CNC control
  • 48 V systems
  • Data acquisition
  • Binary input modules

ISO121x Digital Input Receivers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
ISO1212DBQR datasheet linkISOLATED 24-V TO 60-V DIGITAL INISO1212DBQRISOLATED 24-V TO 60-V DIGITAL IN155 - Immediate
ISO1212DBQR product page link
ISO1212DBQ datasheet linkINDUSTRIAL IOISO1212DBQINDUSTRIAL IO2613 - Immediate
9975 - Factory Stock
ISO1212DBQ product page link
9975 - Factory Stock
ISO1211D product page link

Evaluation Boards

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
ISO1211EVM datasheet linkEVAL BOARD FOR ISO1211ISO1211EVMEVAL BOARD FOR ISO12113 - Immediate
41 - Factory Stock
ISO1211EVM product page link
ISO1212EVM datasheet linkEVAL BOARD FOR ISO1212ISO1212EVMEVAL BOARD FOR ISO12121 - Immediate
53 - Factory Stock
ISO1212EVM product page link
Published: 2017-12-27