IO-Link Device Transceiver

Industry's Smallest Full-Featured IO-Link Device Transceiver in 2.5mm x 2.5mm, 25-Bump WLP

Please check latest availability status for a specific part variant.


The MAX14821 transceiver is suitable for IO-Link® devices and 24V binary sensors/actuators. All specified IO-Link data rates are supported. In IO-Link applications, the transceiver acts as the physical layer interface to a microcontroller running the data-link layer protocol. Additional 24V digital inputs and outputs are provided. Two internal linear regulators generate common sensor and actuator power requirements: 5V and 3.3V.

On-board C/Q and DO drivers are independently configurable for push-pull, high-side (PNP), or low-side (NPN) operation. The device detects the IO-Link C/Q wake-up condition and generates a wake-up signal on the active-low WU output. The C/Q and DI inputs have selectable current loads for use in actuators.

An SPI™ interface allows configuration and monitoring of the device. Extensive alarm conditions are detected and communicated through the active-low IRQ output and the SPI interface. The device features reverse-polarity, short-circuit, and thermal protection. All power lines are monitored for undervoltage conditions.

The C/Q and DO drivers are specified for sourcing/sinking up to 100mA.

The device is available in a 2.5mm x 2.5mm, 25-pin WLP and a 4mm x 4mm, 24-pin TQFN package. Both are specified over the extended -40°C to +85°C temperature range.
MAX14821: Functional Diagram MAX14821: Functional Diagram Enlarge+

Key Features

  • Standards Compliance Ensures Future-Proof Solutions
    • IO-Link Versions 1.0 and 1.1.2
    • IEC IEC61131.9 SDCI
  • High Configurability and Integration Reduces SKUs
    • Push-Pull, PNP or NPN Driver Configuration
    • Supports COM1, COM2, and COM3 Data Rates
    • SPI Interface for Control and Monitoring
    • 2.5V to 5V Logic Interface Levels
    • Auxiliary 24V, 100mA Digital Output (DO)
    • Auxiliary 24V Digital Input (DI)
    • 100mA Specified C/Q output Drive
    • Integrated 5V and 3.3V Regulators
  • Integrated Protection Enables Robust Solutions
    • Extensive Fault-Monitoring and Reporting
    • Reverse-Polarity and Short-Circuit Protection on All 24V Outputs/Inputs
    • Reverse-Polarity Protected 24V Supply Output
    • -40°C to +105°C Operating Temperature Range
  • Small Package Supports Sensor Miniaturization
    • 2.5mm x 2.5mm WLP and 4mm x 4mm TQFN Package


  • Industrial Sensors and Actuators
  • IO-Link Actuators
  • IO-Link Sensors
Part NumberFunctionsVCC
DI Input Threshold
DI Input Threshold
Slew Rate LimitingLogic-Level Supply Voltage
Integrated PowerProtection FeaturesPackage/PinsOper. Temp.
minmaxtyptyphighlowSee Notes
MAX14821 Device Transceiver9361401356.8 to 85.2 to 6.4Yes2.3 to 5.5
3.3V LDO
High Temp Warning and Shutdown
Reverse Polarity
Short Circuit
-40 to +85$3.08 @1k
See All IO-Link Transceivers and Binary Drivers (13)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX14820EVKIT: Evaluation Kit for the MAX14820 and MAX14821

CAD Symbols and Footprints

  • MAX14821ETG+
  • MAX14821ETG+T
  • MAX14821EWA+
  • MAX14821EWA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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