TIOL221RGER Dual-Channel IO-Link PHY: Complete Technical Guide, Specs, and Buying Guide (2026)

The Texas Instruments TIOL221RGER is a dual-channel IO-Link device physical layer (PHY) transceiver that integrates two low-power output drivers with active reverse polarity protection, an integrated LDO, and an SPI configuration interface in a 24-pin VQFN (4x4 mm) package. Key verified specifications include a wake-up capability of at least 500 mA for a typical 80 microsecond duration, surge immunity of 1.2 kV (500 ohm) per IEC 61000-4-5, and built-in undervoltage, overcurrent, and overtemperature protection with fault reporting. The device supports both IO-Link device and IO-Link master applications. As of 2026-09-02, TIOL221RGER is in stock at XAIPART with 99,999 units available, priced from $1.85 at 1,000 units (MOQ 1), and the lifecycle status is active.

What Is the TIOL221RGER and What Does It Do?

An IO-Link transceiver bridges a local microcontroller to the IO-Link communication standard, enabling point-to-point communication between sensors or actuators and an IO-Link master. The TIOL221 converts MCU digital data into IO-Link physical layer signals on the CQ line and vice versa while adding power management and protection. In the component hierarchy it sits as: IO-Link PHY → industrial communication interface → sensor interface IC → mixed-signal semiconductor.

The TIOL221 provides a complete physical layer for IO-Link communication over a three-wire interface. Unlike single-channel PHYs, it integrates two independent IO-Link ports in one package, plus an auxiliary digital input (DI) channel. This dual-channel integration roughly halves board area versus two single-channel PHYs such as the TIOL1115.

Per Texas Instruments, key functional blocks include:

• Dual low-power output drivers with active reverse polarity protection — no external series diode needed, reducing voltage drop and BOM cost.
• Integrated LDO that derives logic power from the 24V industrial rail, simplifying power design for the local MCU.
• SPI interface for per-channel configuration and diagnostics, including fault registers.
• Wake-up support: the device sinks or sources at least 500 mA for the wake-up duration (typically 80 microseconds) depending on the CQ logic level, then asserts the WU pin low for tWUL to notify the local MCU. It can also be configured to generate wake-up pulses, supporting IO-Link master applications.
• Protection and fault reporting for undervoltage, overcurrent, and overtemperature conditions, plus 1.2 kV (500 ohm) surge robustness per IEC 61000-4-5.

How Do You Select and Design In the TIOL221RGER?

Choose the TIOL221RGER when your design needs one or two IO-Link ports, an integrated LDO to power local logic, and SPI-based diagnostics. It fits both device nodes (sensors, actuators, encoders) and master port circuitry. For single-port sensor nodes where dual integration is unnecessary, a single-channel PHY may be more cost-effective (see the comparison section).

Design-In Checklist

• Power architecture: VDD accepts supply from the IO-Link L+ line [DATA_NEEDED: supply voltage range]. Use the integrated LDO output to power the local MCU; decouple the LDO carefully per the design tip in the verified product data.
• CQ line layout: Route CQ1 and CQ2 as the three-wire IO-Link interface lines. The drivers handle ≥500 mA wake-up pulses (typ. 80 µs duration), so size traces and connectors for this transient current.
• Wake-up timing: Configure wake-up timing per the IO-Link specification. The device asserts the WU pin low for tWUL on wake detection [DATA_NEEDED: tWUL duration value].
• Surge protection: The built-in 1.2 kV (500 ohm) surge immunity per IEC 61000-4-5 covers cable-borne transients, but external TVS diodes may still be needed for surge levels beyond the built-in protection — evaluate against your system-level immunity targets.
• SPI integration: Connect the SPI (CS/SCLK/MOSI/MISO) bus to the host MCU for per-port configuration and fault polling (undervoltage, overcurrent, overtemperature).
• Auxiliary DI: Use the auxiliary DI channel to read a second sensor element or auxiliary signal, reducing external logic.
• Package and assembly: 24-VQFN (RGE), 4x4 mm, surface mount, RoHS compliant.

Missing Specifications to Confirm Before Layout

Before finalizing your design, obtain these parameters from the official TI datasheet at ti.com/lit/gpn/TIOL221: supply voltage range, IO-Link data rates (COM1/COM2/COM3), quiescent current, and operating temperature range. [DATA_NEEDED: supply voltage range; IO-Link data rates COM1/COM2/COM3; quiescent current; operating temperature range]

Which Alternatives Compare to the TIOL221RGER?

There is currently no verified cross-manufacturer pin-compatible drop-in replacement for the dual-channel TIOL221 in a 24-VQFN. The verified in-family alternatives from Texas Instruments are all single-channel devices, so they are functionally similar — not pin-identical — replacements, and a PCB redesign is required.

Selection guidance: Choose the TIOL221RGER when your IO-Link master, gateway, or device node needs two ports, or when consolidating two single-channel PHYs saves board area and BOM cost. Choose the TIOL1115 (RGER or DMRR) for single-port nodes where dual integration is unnecessary. The TIOL1125 also targets IO-Link device nodes with an integrated LDO, but its channel count and pinout differ from the TIOL221, so the two are not interchangeable.

What Is the Market Position, Lifecycle Status, and Supply Situation of the TIOL221RGER?

Per the XAIPART product database, the TIOL221RGER lifecycle status is active. As of 2026-09-02, XAIPART stocks 99,999 units with an MOQ of 1, and tiered pricing of $3.20 (qty ≥ 1), $2.88 (qty ≥ 10), $2.45 (qty ≥ 100), $2.10 (qty ≥ 500), and $1.85 (qty ≥ 1,000). Authorized distributors including DigiKey and Mouser also list the part as in stock and shipping today (as of 2026-08-29). [DATA_NEEDED: forecasted end-of-life date; projected demand growth figures] For evaluation, Texas Instruments offers the TIOL221EVM IO-Link interface evaluation module, stocked at DigiKey and other distributors (ships today as of 2026-08-29).

What Trends and Developments Should Buyers Watch for IO-Link PHYs?

Industry 4.0 deployments continue to drive demand for multi-port IO-Link connectivity, and the TIOL221's dual-channel architecture directly supports this: four ICs provide eight ports versus eight single-channel PHYs, cutting board area and cost in dense industrial cabinets and gateways. Anchored to verified specs, buyers should watch:

• Integration density: The combination of dual channels, an integrated LDO, and active reverse polarity protection in a single 24-VQFN (4x4 mm) reflects the trend toward fewer components per port.
• Diagnostics-driven maintenance: The SPI-based fault reporting (undervoltage, overcurrent, overtemperature) supports predictive maintenance schemes in process industries, a growing requirement for smart transmitters.
• Robustness expectations: The 1.2 kV (500 ohm) surge immunity per IEC 61000-4-5 and ≥500 mA wake capability align with the electrical reality of factory-floor cabling.
• Supply planning: With active lifecycle status and deep stock (99,999 units at XAIPART as of 2026-09-02), availability is currently strong; nevertheless, for multi-year programs, confirm long-term supply with TI and distributors.
• Evaluation-first design: Use the TIOL221EVM to exercise SPI configuration, wake-up, and driver functions before committing to PCB layout.

How Does the TIOL221 Wake-Up Mechanism Work in Practice?

Per the TI datasheet, when a wake-up condition is detected on the CQ line, the device asserts the WU pin low for the duration of tWUL, notifying the local microcontroller. In master applications, the device can generate the wake pulse itself: it sinks or sources at least 500 mA for the wake-up duration, typically 80 microseconds, depending on the CQ logic level, in accordance with the IO-Link specification. Firmware should treat the WU assertion as an interrupt source and respond within the timing window defined by the IO-Link specification. [VERIFY_NEEDED: exact tWUL duration value from datasheet]

How Should You Structure a Two-Port IO-Link Master Port Pair Using One TIOL221?

A practical design uses one TIOL221RGER to serve two IO-Link master ports: the host MCU configures both channels independently over the shared SPI bus, generates wake-up pulses via the CQ drivers (≥500 mA, ~80 µs), and polls fault registers for undervoltage, overcurrent, and overtemperature conditions. Active reverse polarity protection guards each port against field miswiring without external series diodes, and the integrated LDO supplies the local logic from the L+ rail. For a four-port gateway, two TIOL221 ICs on the same SPI bus halve the PHY footprint versus four single-channel devices. [DATA_NEEDED: supply voltage range] [VERIFY_NEEDED: maximum number of PHYs sharing one SPI bus segment]

Key Takeaways for Engineers and Buyers

The TIOL221RGER consolidates two IO-Link PHY ports, an LDO, SPI diagnostics, and comprehensive protection into one 4x4 mm VQFN, cutting board area roughly in half versus two single-channel PHYs. With active lifecycle status, deep stock, and tiered pricing from $1.85 at 1,000 units as of 2026-09-02, it is a low-risk selection for dual-port device nodes, master ports, and IIoT gateways — provided you confirm the supply voltage range, COM data rates, quiescent current, and operating temperature range from the official TI datasheet before finalizing layout.