ISO1211DR

The ISO1211 and ISO1212 devices are isolated 24V to 60V digital input receivers that comply with the characteristics standards of IEC 61131-2 Category 1, Category 2, and Category 3. These devices can implement 9V to 300V DC and AC digital input modules in programmable logic controllers (PLCs), motor control, grid infrastructure, and other industrial applications. Different from traditional optocoupler solutions with discrete and inaccurate current limiting circuits, the ISO121x devices provide a simple low-power solution with precise current limiting, enabling the design of compact and high-density I/O modules. These devices do not require a field-side power supply and can be configured as a current-sourcing or current-sinking input. The ISO121x devices operate over a voltage range of 2.25V to 5.5V and support 2.5V, 3.3V, and 5V controllers. The ±60V input tolerance with reverse polarity protection helps ensure that the input pins are protected in case of a fault with negligible reverse current. These devices support data rates of up to 4Mbps and can pass a minimum pulse width of 150ns, enabling high-speed operation. The ISO1211 device is suitable for designs that require inter-channel isolation, while the ISO1212 device is suitable for multi-channel space-constrained designs. Compared with traditional solutions, the ISO121x devices reduce the number of components, simplify system design, improve performance, and lower the circuit board temperature.

Applications

• PLC digital input modules
• Hybrid I/O modules
• Motor drive I/O and position feedback
• CNC control
• Substation automation
• Data acquisition binary input modules

Key features

• Compliant with IEC 61131-2 Type 1, 2, and 3 characteristics for 24V isolated digital inputs
• Supports 9V to 300V DC and AC digital input designs (with external resistors)
• Low power consumption via precise current limiting: 2.2mA to 2.47mA for Type 3, adjustable up to 6.5mA
• Eliminates the need for field-side power supply
• Wide input voltage range with reverse polarity protection: ±60V
• Wire-break detection
• Configurable as sourcing or sinking input
• High data rate: up to 4Mbps
• Multiplexer output signal enable pin
• High transient immunity: ±70kV/μs CMTI
• Wide supply voltage 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
• Safety-related certifications: basic insulation per DIN V VDE V 0884-10, UL 1577 certified, 2500VRMS isolation, CSA, CQC, and TUV certifications available