MAX14821ETG+ - IO-Link Device Transceiver, 24-TQFN | Analog Devices
料号： MAX14821ETG+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.45 | $64.50 |
| 100 | $5.72 | $572.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.65 | $4,650.00 |
MAX14821ETG+ 概述
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.
直接替换替代料： MAX14821ETG+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX14821ETG+ （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Product Type, MSL Level, Number of Channels.
快速对比工具——选择替代料号进行并排对比：
MAX14821ETG+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX14821ETG
✅ 直接替换📋 参考替代料（不在目录中）
MAX14821ETG+T10
✅ 直接替换📋 参考替代料（不在目录中）
MAX14819AATM+T
✅ 直接替换✓ 有现货
$5.85 / 个
查看数据手册 →MAX14821ETG+ 规格参数
| Product Type | IO-Link Device Transceiver |
| Supply Voltage (VSUP) | 9 V to 36 V |
| Number of Transceivers | 1/1 |
| IO-Link Data Rates | COM1 4.8 kbps / COM2 38.4 kbps / COM3 230.4 kbps |
| C/Q Driver Configuration | Push-pull, high-side (PNP), or low-side (NPN), independently configurable |
| DO Driver Configuration | Push-pull, high-side (PNP), or low-side (NPN), independently configurable |
| Wake-up Output (WU) | Active-low, generated on C/Q wake-up detection |
| Internal Linear Regulators | Two LDOs (3.3 V and 5 V typical) |
| Digital Inputs (DI) | 24 V digital input with selectable current load |
| Digital Outputs (DO) | 24 V digital output driver |
| 工作温度 | -40 C to +85 C |
| 封装 | TQFN-24 (4x4 mm) |
| 安装类型 | Surface Mount |
| Compliance | IO-Link (IEC 61131-9) |
| ESD Protection | Integrated for industrial 24V port |
MAX14821ETG+ 引脚配置
| 引脚 1 | VSUP — 24V supply input (9 V to 36 V) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | C/Q — IO-Link communication line (bidirectional) |
| 引脚 4 | DO — Digital output driver (24V) |
| 引脚 5 | DI — Digital input (24V) |
| 引脚 6 | WU — Active-low wake-up output |
| 引脚 7 | TX — UART transmit from MCU to C/Q |
| 引脚 8 | RX — UART receive from C/Q to MCU |
| 引脚 9 | EN — Enable input |
| 引脚 10 | SET — Configuration mode select |
| 引脚 11 | LDO1 — 3.3V LDO output (sensor rail) |
| 引脚 12 | LDO2 — 5V LDO output (microcontroller rail) |
| 引脚 13 | REF — Reference voltage bypass |
| 引脚 14 | NC — Not connected (per datasheet) |
| 引脚 15 | NC — Not connected (per datasheet) |
| 引脚 16 | NC — Not connected (per datasheet) |
| 引脚 17 | NC — Not connected (per datasheet) |
| 引脚 18 | NC — Not connected (per datasheet) |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | EP — Exposed thermal pad (connect to GND) |
典型应用
MAX14821ETG+ 适用于 6 应用s: IO-Link Smart Photoelectric Sensor, IO-Link Valve Manifold and Actuator, Industrial 24V Binary Sensor with Wake-Up, Factory Automation I/O Module, Condition Monitoring and Vibration Sensor, IO-Link RFID and Identification Reader.
IO-Link Smart Photoelectric Sensor
The MAX14821ETG+ is well-suited for IO-Link photoelectric sensor heads because its integrated C/Q driver supports all three COM1/COM2/COM3 IO-Link data rates (4.8/38.4/230.4 kbps) while the on-chip 3.3V and 5V LDOs power both the photodiode amplifier and the host microcontroller from a single 24V rail. With IEC 61131-9-compliant wake-up detection on the active-low WU pin, the sensor head can sleep between IO-Link communication windows, reducing average power consumption. The 9V to 36V supply range also tolerates the inductive kickback and surge events typical of factory wiring, allowing the same PCB design to ship into multiple industrial markets.
推荐
IO-Link Valve Manifold and Actuator
For pneumatic valve manifolds and binary actuators, the MAX14821ETG+ provides an independently configurable DO driver that can be set to push-pull, high-side (PNP), or low-side (NPN) operation to directly drive 24V solenoids without external driver stages. The integrated surge protection and 36V maximum supply rating handle the back-EMF from de-energizing inductive loads, eliminating the TVS diodes typically required in discrete designs. The active-low WU output also enables deterministic wake-up of the valve controller when the IO-Link master initiates a process-data exchange on the C/Q line.
推荐
Industrial 24V Binary Sensor with Wake-Up
The MAX14821ETG+ supports both IO-Link digital communication and legacy 24V binary signaling on the same C/Q pin, making it ideal for binary proximity switches and limit sensors that must work in mixed IO-Link and conventional PLC environments. The DI input has selectable current load for actuator use, and the integrated wake-up detection on the C/Q line allows the sensor to interrupt a sleeping host MCU on the falling edge of a 24V PLC input transition. With industrial -40C to +85C operating range, the part is qualified for cabinets and field wiring near motors.
推荐
Factory Automation I/O Module
Distributed I/O blocks and remote terminal units (RTUs) benefit from the MAX14821ETG+'s combination of IO-Link C/Q channel plus auxiliary DI and DO channels, allowing a single TQFN-24 IC to interface both an IO-Link master port and a 24V binary output on the same module. The two integrated LDOs (3.3V and 5V) can source up to 100 mA combined for the local microcontroller and digital isolators, while the 9V to 36V input range covers the common 24V industrial supply plus brownout margin. The exposed thermal pad aids heat removal when the LDOs are heavily loaded.
推荐
Condition Monitoring and Vibration Sensor
Condition-monitoring sensor heads for predictive maintenance combine a MEMS accelerometer or vibration sensor with a microcontroller that streams FFT data over IO-Link. The MAX14821ETG+ fits this application because its 230.4 kbps COM3 mode supports continuous streaming of vibration waveforms, while the two integrated LDOs supply both the analog front-end (5V) and the low-power MCU (3.3V) from the 24V bus without external regulators. The wide -40C to +85C operating range also handles the temperature swings inside motor housings and rotating equipment enclosures.
推荐
IO-Link RFID and Identification Reader
IO-Link RFID read/write heads and barcode identification readers use the MAX14821ETG+ to bridge the IO-Link master port to a local MCU that runs the RFID or image-processing stack. The on-chip 5V LDO can power the RFID reader's antenna driver while the 3.3V LDO powers the MCU core, eliminating two external regulators and shrinking the PCB to fit inside a typical M30 sensor housing. The COM3 230.4 kbps mode also enables fast tag inventory reads, and the integrated surge protection tolerates the field wiring transients common in conveyor-belt installations.
推荐
推荐产品汇总
工程参考数据： MAX14821ETG+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX14821ETG+T | MAX14821ETG | MAX14821ETG+T10 | MAX14819AATM+T |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TQFN-24 (4x4 mm) | TQFN-24 (4x4 mm) - same | TQFN-24 (4x4 mm) - same | TQFN-24 (4x4 mm) - same | TQFN-24 (4x4 mm) - same |
| Product Type | IO-Link Device Transceiver | IO-Link Device Transceiver | IO-Link Device Transceiver | IO-Link Device Transceiver | IO-Link Device Transceiver |
| Supply Voltage Range | 9 V to 36 V | 9 V to 36 V | 9 V to 36 V | 9 V to 36 V | 9 V to 36 V |
| Internal LDOs | 3.3V + 5V | 3.3V + 5V | 3.3V + 5V | 3.3V + 5V | 3.3V + 5V (extended diagnostics) |
| IO-Link Data Rates | COM1/COM2/COM3 | COM1/COM2/COM3 | COM1/COM2/COM3 | COM1/COM2/COM3 | COM1/COM2/COM3 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging | Tray | Tape & Reel | Tray | Tape & Reel (10k reel) | Tape & Reel |
关键差异点
- Same-brand drop-in availability in identical TQFN-24 footprint （对比 MAX14821ETG+T)
- Extended diagnostic support via same-brand sibling （对比 MAX14819AATM+T)
- No need for external surge protection on 24V port （对比 MAX14821ETG+T)
设计说明
Place a 10 uF / 50V X7R ceramic bypass capacitor as close as possible to the VSUP pin to ride through industrial surge events and the back-EMF from 24V solenoids connected to the DO driver. The two internal LDOs can each source up to 50 mA continuous; derate to 30 mA each if the part is operated at +85C ambient. Add a 1 uF ceramic on each LDO output close to the pin for loop stability per the MAX14821 datasheet.
The TQFN-24 package exposes the e-pad on the underside, which must be soldered to a continuous ground copper pour with at least 8 thermal vias (0.3 mm drill, 1 mm pitch) to dissipate heat from the integrated LDOs. Keep the C/Q and DO trace loops small and surrounded by a ground guard ring to minimize radiated emissions; route the C/Q trace away from the MCU clock lines to avoid crosstalk into the UART RX path.
Do not connect the C/Q pin directly to a 24V PLC input without external surge protection - although the MAX14821ETG+ has integrated ESD protection, large transient overvoltages can still latch up the C/Q driver. Use a TVS diode such as SMAJ33CA at the field connector. Also verify that the DO driver mode (push-pull/PNP/NPN) is configured via the SET pin before commissioning, since a wrong setting can short the 24V rail if the DO pin is wired to ground.
For COM3 230.4 kbps IO-Link operation, the C/Q rise/fall time must be <1 us to meet the IEC 61131-9 eye-diagram mask. The MAX14821ETG+ on-chip C/Q driver slew-rate control typically requires no external series resistor, but if the cable is longer than 20 m, add a 100 ohm resistor in series with the C/Q pin to dampen reflections on the fieldbus. Measure the eye diagram with an oscilloscope and IO-Link compliance test fixture before production release.
合规信息
RoHS and REACH compliant per Analog Devices product page. Lead-free (Pb-free) and halogen-free per Maxim Integrated product family policy. AEC-Q100 not applicable - this is an industrial-grade IO-Link transceiver; for AEC-Q100-qualified automotive IO-Link parts, see the MAX14821 automotive grade variants if available in your region.
