MAX14821ETG+
MAX14821ETG+ - IO-Link Device Transceiver, 24-TQFN | Analog Devices
The Analog Devices MAX14821ETG+ is an IO-Link device transceiver in a 24-pin TQFN (4x4 mm) package designed for industrial sensor and actuator networks operating on the 24V IO-Link standard. It supports all IO-Link data rates (COM1/COM2/COM3 at 4.8/38.4/230.4 kbps), operates from a 9V to 36V supply range, and integrates C/Q and DO drivers that 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 for microcontroller power management. Two internal linear regulators (3.3V and 5V) generate common sensor and microcontroller supply rails from the 24V bus, reducing BOM count in industrial sensor heads.
An IO-Link device transceiver is a physical-layer interface IC that bridges a microcontroller (running the data-link layer protocol) to the 24V IO-Link master port on the fieldbus. In the broader taxonomy, it belongs to sensor interface ICs, then industrial interface ICs, then interface ICs, and ultimately the integrated circuits family. IO-Link (IEC 61131-9) is a point-to-point, bidirectional digital communication standard that replaces traditional 4-20 mA and binary 24V signaling with a single standardized cable carrying both power and process data, enabling predictive maintenance and rich diagnostic data on factory floors.
Key features of the MAX14821ETG+ include 1/1 transceiver topology, integrated surge protection for industrial 24V lines, selectable C/Q and DI current loads for actuator use, and a wide -40C to +85C industrial operating temperature range. The C/Q driver is rated for the high-current switching demanded by industrial actuators, while the DI (digital input) and DO (digital output) channels support legacy 24V binary sensor and actuator signaling. The integrated 5V/3.3V LDO outputs eliminate the need for external regulators in most sensor head designs, while the WU output pin enables ultra-low-power sleep modes for IO-Link-compliant wake-up sequences.
From an architectural standpoint, the MAX14821ETG+ integrates the 24V physical layer, two LDO regulators, surge/transient protection, and configurable driver stages into a single die. This level of integration allows a complete IO-Link device node to be built with the MAX14821ETG+, a microcontroller, and minimal external passives. The device is designed to meet IEC 61131-9 IO-Link specifications and the IEC 61000-4-2 ESD and surge immunity requirements typical of industrial 24V environments.
Typical applications include IO-Link smart sensors (photoelectric, inductive, capacitive, pressure), IO-Link valve manifolds and binary actuators, industrial 24V binary sensors with wake-up capability, and factory automation I/O modules. It is also well-suited for distributed I/O blocks, proximity switches, and condition-monitoring sensor heads where the 24V bus doubles as both power supply and communication line.
When designing with this transceiver, ensure that the C/Q and DO driver configurations match the connected load (sink vs source) before commissioning, and place the bulk 24V decoupling capacitor close to the VSUP pin to ride through industrial surge events. Designers should also account for the thermal dissipation of the integrated LDOs when sourcing 100 mA continuously to the microcontroller rail.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes that go beyond what is reproduced in the manufacturer datasheet, helping engineers accelerate their IO-Link device development and source decisions.
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