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ISO1212

ACTIVE

Dual-channel Isolated 24-V to 60-V digital input receiver for digital input modules

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Data sheet

ISO1212

ACTIVE
Data sheet Order now

Product details

Rating Catalog Isolation rating Basic Number of channels 2 Forward/reverse channels 2/0 Data rate (max) (Mbps) 4 Working isolation voltage (VIOWM) (Vrms) 400 Surge isolation voltage (VIOSM) (VPK) 5200 Transient isolation voltage (VIOTM) (VPK) 3600 Withstand isolation voltage (VISO) (Vrms) 2500 CMTI (min) (kV/µs) 25 Operating temperature range (°C) -40 to 125 Supply voltage (max) (V) 60 Supply voltage (min) (V) 2.25 Propagation delay time (typ) (µs) 0.14
Rating Catalog Isolation rating Basic Number of channels 2 Forward/reverse channels 2/0 Data rate (max) (Mbps) 4 Working isolation voltage (VIOWM) (Vrms) 400 Surge isolation voltage (VIOSM) (VPK) 5200 Transient isolation voltage (VIOTM) (VPK) 3600 Withstand isolation voltage (VISO) (Vrms) 2500 CMTI (min) (kV/µs) 25 Operating temperature range (°C) -40 to 125 Supply voltage (max) (V) 60 Supply voltage (min) (V) 2.25 Propagation delay time (typ) (µs) 0.14
SSOP (DBQ) 16 29.4 mm² 4.9 x 6
  • Compliant to IEC 61131-2; Type 1, 2, 3 characteristics for 24V isolated digital inputs
  • Supports 9V to 300V DC and AC digital input designs using external resistors
  • Accurate Current Limit for Low-Power Dissipation:
    • 2.2mA to 2.47mA for Type 3
    • Adjustable up to 6.5mA
  • Eliminates the need for field-side power supply
  • High input-voltage range with reverse polarity protection: ±60V
  • Wire-break detection (refer to TIDA-01509)
  • Configurable as sourcing or sinking input
  • High data rates: up to 4Mbps
  • Enable pin to multiplex output signals
  • High transient immunity: ±70kV/µs CMTI
  • Wide supply range (VCC1): 2.25V to 5.5V
  • Ambient temperature range: –40°C to +125°C
  • Compact package options:
    • Single-channel ISO1211, SOIC-8
    • Dual-channel ISO1212, SSOP-16
  • Functional safety capable
    • Documentation available to aid functional safety system design: ISO1211, ISO1212
  • Compliant to IEC 61131-2; Type 1, 2, 3 characteristics for 24V isolated digital inputs
  • Supports 9V to 300V DC and AC digital input designs using external resistors
  • Accurate Current Limit for Low-Power Dissipation:
    • 2.2mA to 2.47mA for Type 3
    • Adjustable up to 6.5mA
  • Eliminates the need for field-side power supply
  • High input-voltage range with reverse polarity protection: ±60V
  • Wire-break detection (refer to TIDA-01509)
  • Configurable as sourcing or sinking input
  • High data rates: up to 4Mbps
  • Enable pin to multiplex output signals
  • High transient immunity: ±70kV/µs CMTI
  • Wide supply range (VCC1): 2.25V to 5.5V
  • Ambient temperature range: –40°C to +125°C
  • Compact package options:
    • Single-channel ISO1211, SOIC-8
    • Dual-channel ISO1212, SSOP-16
  • Functional safety capable
    • Documentation available to aid functional safety system design: ISO1211, ISO1212

The ISO1211 and ISO1212 devices are isolated 24V to 60V digital input receivers, compliant to IEC 61131-2 Type 1, 2, and 3 characteristics. These devices enable 9V to 300V DC and AC digital input modules in programmable logic controllers (PLCs), motor-control, grid infrastructure, and other industrial applications. Unlike traditional optocoupler designs with discrete, imprecise current limiting circuitry, the ISO121x devices provide a simple, low-power design 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 2.25V to 5.5V, supporting 2.5V, 3.3V, and 5V controllers. A ±60V input tolerance with reverse polarity protection helps provide the input pins are protected in case of faults with negligible reverse current. These devices support up to 4Mbps data rates passing a minimum pulse width of 150ns for high-speed operation. The ISO1211 device is designed for applications that require channel-to-channel isolation and the ISO1212 device is designed for multichannel space-constrained designs.

The ISO121x devices reduce component count, simplify system design, improve performance, and reduce board temperatures compared to traditional designs. For details, refer to the How To Simplify Isolated 24V PLC Digital Input Module Designs TI TechNote, How To Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives TI TechNote, and How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC Detection TI TechNote.

The ISO1211 and ISO1212 devices are isolated 24V to 60V digital input receivers, compliant to IEC 61131-2 Type 1, 2, and 3 characteristics. These devices enable 9V to 300V DC and AC digital input modules in programmable logic controllers (PLCs), motor-control, grid infrastructure, and other industrial applications. Unlike traditional optocoupler designs with discrete, imprecise current limiting circuitry, the ISO121x devices provide a simple, low-power design 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 2.25V to 5.5V, supporting 2.5V, 3.3V, and 5V controllers. A ±60V input tolerance with reverse polarity protection helps provide the input pins are protected in case of faults with negligible reverse current. These devices support up to 4Mbps data rates passing a minimum pulse width of 150ns for high-speed operation. The ISO1211 device is designed for applications that require channel-to-channel isolation and the ISO1212 device is designed for multichannel space-constrained designs.

The ISO121x devices reduce component count, simplify system design, improve performance, and reduce board temperatures compared to traditional designs. For details, refer to the How To Simplify Isolated 24V PLC Digital Input Module Designs TI TechNote, How To Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives TI TechNote, and How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC Detection TI TechNote.
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Technical documentation

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Type Title Date
* Data sheet ISO121x Isolated 24V to 60V Digital Input Receivers for Digital Input Modules datasheet (Rev. G) PDF | HTML 12 Feb 2025
Certificate UL Certificate of Compliance File E181974 Vol 4 Sec 6 (Rev. R) 08 Sep 2025
Certificate VDE Certificate for Basic Isolation for DIN EN IEC 60747-17 (Rev. Y) 20 Aug 2025
Certificate CQC Certificate for ISOxxDBQ (Rev. B) 19 Aug 2025
Certificate TUV Certificate for Isolation Devices (Rev. L) 15 Aug 2025
Application brief How To Simplify Isolated 24V PLC Digital Input Module Designs (Rev. D) PDF | HTML 30 Jun 2025
Application brief Space-Saving Design Techniques for Multichannel High-Voltage Digital Input Modules (Rev. C) PDF | HTML 11 Nov 2024
Functional safety information ISO1212 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 12 Sep 2024
Certificate CSA Certificate for ISO1212xDBQ 23 Mar 2023
Application note L1 and L2 EV Charger Electric Vehicle Service Equipment Design Considerations (Rev. B) 09 Jun 2021
Application brief How to Design Isolated Digital Input Modules for Surge Immunity 31 Mar 2020
Technical article Solving lifetime and temperature challenges in AC motor drives with capacitive-bas PDF | HTML 01 Nov 2019
White paper How Capacitive Isolation Solves Key Challenges in AC Motor Drives 23 Aug 2019
Technical article What are isolated digital inputs? PDF | HTML 08 Mar 2019
Application brief How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC Detection (Rev. A) 14 Mar 2018
Application note ISO121x Threshold Calculator for 9V to 300V DC and AC Voltage Detection 01 Mar 2018
User guide ISO1212 Isolated Digital-Input Receiver Evaluation Module (Rev. A) 18 Jan 2018
Application brief How to Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives 16 Dec 2017
Analog Design Journal How to use isolation to improve ESD, EFT and surge immunity in industrial system 24 Jul 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ISO1212EVM — Evaluation module for the ISO1212 dual-channel isolated digital input receiver

The ISO1212EVM is an evaluaton module (EVM) to evaluate the ISO1212 isolated industrial receiver that can receive a 9-V to 60-V field input and provide an isolated digital output. The EVM accommodates 4 dual-channel ISO1212 devices showcasing 8-channel functionality. The EVM (...)
User guide: PDF
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Simulation model

ISO1212 PSpice Transient Model (Rev. A)

SLLM384A.ZIP (62 KB) - PSpice Model
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Simulation model

ISO1212 TINA-TI Transient Reference Design (Rev. A)

SLLM391A.TSC (1215 KB) - TINA-TI Reference Design
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Simulation model

ISO1212 TINA-TI Transient Spice Model

SLLM392.ZIP (16 KB) - TINA-TI Spice Model
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Simulation model

ISO1212 TINA-TI Transient Spice Model (Rev. A)

SLLM392A.ZIP (16 KB) - TINA-TI Spice Model
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Simulation model

ISO121X IBIS Model (Rev. B)

SLLM372B.ZIP (52 KB) - IBIS Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

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Design guide: PDF
Reference designs

TIDA-01509 — Broken Wire Detection Using An Optical Switch Reference Design

This reference design shows a compact implementation of 16 isolated digital input channels using TI's ISO121x devices. The design is split into two groups of eight channels each. A broken wire detection can be executed using only one additional optical switch for each channel or two optical (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010950 — Damper and EEV controller Reference Design with power regulation and Hall-effect position sensing

This reference design demonstrates a dual motor drive solution for damper actuators and electronic expansion valves . The multiple motor drives include one bipolar stepper motor driver, one brushless DC motor driver, operating from a 15VDC source. The design shows accurate power limiting that helps (...)
Design guide: PDF
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TIDA-010083 — High density isolated PoE and GigE reference design for machine vision cameras and vision sensors

Power over Ethernet (PoE) offers an easy and reliable solution to combine power and data in one cable with high data rate and long reach. This combination makes PoE ideal for small devices such as machine vision cameras and vision sensors. This reference design implements a complete PoE powered (...)
Design guide: PDF
Schematic: PDF
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TIDA-010008 — Flat-Clamp TVS based Reference Design for Protection Against Transient for Grid Applications

This reference design features multiple approaches for  protecting AC or DC analog input, DC analog output, AC or DC binary input, digital output with a high side or low side driver, LCD bias supply, USB interfaces (power and data) and onboard power supplies with 24, 12 or 5V input used in (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-060014 — 96-Channel Bidirectional Digital Input Module Reference Design for PLC

This reference design is a compact implementation of 96 isolated digital input channels using the ISO1212, an isolated digital input receiver. This design shows the current limit feature of the ISO1212 device which has better thermal performance than traditional optocoupler solutions. This design (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01508 — Sub 1-W, 16-Channel, Isolated Digital Input Module Reference Design

This reference design shows a compact implementation of 16 isolated digital input channels using TI's ISO121x devices. The design works without an isolated supply and supports up to 100-kHz input signals (200-kbit) per channel. All 16 channels consume less than 1-W input power combined, which (...)
Design guide: PDF
Schematic: PDF
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