Texas Instruments TPS23881ARTQR

Overview

TPS23881ARTQR from Texas Instruments is an IEEE 802.3bt-compliant 8-channel Type-4 Power Sourcing Equipment (PSE) controller with SRAM programmability, ±2.5% programmable power limiting accuracy, 200-mΩ current sense resistor integration, and operation across –40°C to +125°C. It enables 4-pair PoE delivery up to 90 W per port in video recorders, campus switches, and small business infrastructure.

For engineers reviewing the TPS23881ARTQR datasheet, TPS23881ARTQR pinout, TPS23881ARTQR application, or TPS23881ARTQR equivalent, this page delivers verified technical context, real-world port configuration trade-offs, thermal design constraints for high-density PoE systems, and validated alternative PSE controllers for multi-port 802.3bt deployments.

Technical Context

The TPS23881ARTQR implements independent per-port detection, classification, and DC disconnect using dedicated 14-bit integrating ADCs and Kelvin-sense current measurement across eight channels. Its external N-channel MOSFET architecture supports both 2-pair (15.4–75 W) and 4-pair (30–90 W) port allocations with selectable inrush foldback and fast shutdown via 1-bit or 3-bit OSS inputs.

Programmable SRAM enables field-upgradable I²C firmware for IEEE compliance updates and interoperability tuning. The device integrates ultra-low-alpha (ULA) packaging and dual ground planes (AGND/DGND) with separate thermal pad connection to support continuous 125°C junction operation in compact switch designs.

Key Specifications

Pinout & Package

VQFN-56 package (8.0 mm × 8.0 mm) with exposed thermal pad requiring low-resistance connection to system AGND and DGND planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE PSE controller applications.

Compared with TPS23880RTQR and TPS23882RTQR, the TPS23881ARTQR uniquely combines 4-pair 90 W support, SRAM-based firmware upgradability, and ULA packaging - making it the sole choice for future-proof, high-power, field-maintainable PoE 2 infrastructure.

Availability

TPS23881ARTQR is available at Aetrix Electronics and suitable for video surveillance infrastructure, enterprise campus switching, and small business networking requiring stable component supply, long-term lifecycle assurance, and full IEEE 802.3bt compliance.

Supply support for TPS23881ARTQR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of PoE innovation.

The TPS23881ARTQR belongs to TI's high-density PoE PSE controller product line, engineered specifically for scalable, firmware-upgradable 802.3bt infrastructure supporting up to 48 ports per system via FirmPSE coordination.

FAQ

What is the maximum per-port power supported by the TPS23881ARTQR?

The TPS23881ARTQR supports up to 90 W per port in 4-pair configuration per IEEE 802.3bt Type 4. Its ±2.5% programmable power limiting accuracy enables safe operation beyond 90 W-up to approximately 125 W-with appropriate thermal derating and external FET selection. This headroom is critical for powering next-generation high-power PDs such as PTZ cameras with heaters and AI-enabled edge devices.

Does the TPS23881ARTQR support legacy PoE devices?

Yes, the TPS23881ARTQR supports single- and dual-signature PDs compliant with IEEE 802.3af and 802.3at standards. It performs legacy PD capacitance measurement (1–12 µF range) to reject non-PoE devices like surge protectors, and maintains backward compatibility through configurable 2-pair port allocation delivering 15.4 W (Type 1) or 30 W (Type 2) per port.

How does the TPS23881ARTQR handle thermal management in high-density designs?

The TPS23881ARTQR uses a VQFN-56 package with an exposed thermal pad requiring low-resistance connection to both AGND and DGND planes. Its RθJB of 3.7°C/W and RθJC(bot) of 0.5°C/W enable efficient heat transfer to the PCB. For continuous 125°C operation, designers must maintain ≥1000 mm² copper area under the thermal pad and ensure airflow or heatsinking in enclosed switch chassis.

Can the TPS23881ARTQR be used without an external microcontroller?

Yes - the TPS23881ARTQR supports autonomous operation modes (auto, semi-auto, manual/diagnostic) and performs full PD detection, classification, power application, and fault management independently. While I²C control enables advanced coordination (e.g., with TI's FirmPSE), the device functions as a self-contained PSE controller with no host processor required for basic operation.

What is the purpose of the KSENSA–D pins on the TPS23881ARTQR?

The KSENSA–D pins provide Kelvin-sense connections for the eight current sense inputs (SEN1–8), enabling precise differential voltage measurement across the 0.200-Ω external sense resistors. Each KSENS pin serves two adjacent SEN pins (e.g., KSENSA for SEN1/SEN2), minimizing PCB trace resistance error and ensuring ±2% current measurement accuracy essential for reliable power policing and foldback protection.