Texas Instruments TPS23881B1RTQR

Overview

TPS23881B1RTQR from Texas Instruments is an IEEE 802.3bt-compliant Type-4 4-pair 8-channel Power Sourcing Equipment (PSE) controller with SRAM programmability, ±2.5% programmable power limiting accuracy, 200-mΩ integrated current sense resistor, and dedicated 14-bit per-port integrating ADCs. It enables up to 90 W per port in 4-pair configurations and supports legacy PD capacitance measurement for robust detection in video recorder (NVR/DVR), campus switch, and small business PoE infrastructure.

For engineers reviewing the TPS23881B1RTQR datasheet, TPS23881B1RTQR pinout, TPS23881B1RTQR application, or TPS23881B1RTQR equivalent, this device delivers precise per-port power policing (±2.5% at ≥90 W), Kelvin-sensed current monitoring across eight channels, I²C-programmable SRAM for field firmware updates, and fast 1-/3-bit port shutdown - critical for high-density, thermally constrained PoE 2 systems requiring interoperability with latest IEEE-compliant PDs.

Technical Context

The TPS23881B1RTQR implements a fully independent 8-channel PSE architecture with dual-mode 2-pair/4-pair port allocation, supporting both single-signature and dual-signature PDs. Each channel integrates a dedicated 14-bit integrating ADC for continuous current telemetry and parallel classification, enabling sub-100-ms port turn-on times.

Its external N-channel MOSFET control uses GAT1–GAT8 outputs with fast foldback (≤1 µs short-circuit response), programmable inrush limits (ALTIRNn), and DC disconnect detection (VIMIN down to 0.4 mV). The 0.200-Ω RSENSE with Kelvin sensing (KSENSA–KSENSD) ensures 2% current measurement accuracy and eliminates PCB trace resistance error in high-current PoE 2 designs.

Key Specifications

Pinout & Package

VQFN-56 (RTQ) package, 8.00 mm × 8.00 mm body size with exposed thermal pad; requires low-impedance connection of AGND and DGND to PCB ground plane via thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE 2 PSE controller applications.

Compared with TPS23881RTQR, the TPS23881B1RTQR adds ULA packaging for enhanced reliability in radiation-prone environments, while TPS23882RTQR sacrifices 4-pair support and high-power accuracy - making TPS23881B1RTQR the sole choice for full IEEE 802.3bt Type 4 infrastructure demanding 90 W, field-upgradable firmware, and Kelvin-sensed precision.

Availability

TPS23881B1RTQR 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 Type 4 compliance.

Supply support for TPS23881B1RTQR 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 solutions, with decades of leadership in Power over Ethernet technology.

The TPS23881 product line delivers high-density, software-configurable PoE 2 PSE controllers targeting next-generation switches, NVRs, and infrastructure gear requiring 90 W per port, field firmware updates, and robust interoperability with evolving IEEE standards.

FAQ

What is the key differentiator of TPS23881B1RTQR versus earlier TPS23880-based designs?

The TPS23881B1RTQR improves upon the TPS23880 with a lower 0.200-Ω current sense resistor (vs. 0.255 Ω), ±2.5% programmable power limiting accuracy at ≥90 W (vs. ±3.0%), integrated legacy PD capacitance measurement (1–12 µF), and SRAM-based field firmware upgradability via I²C. These enhancements directly enable higher power density, tighter power budgeting, broader PD compatibility, and future IEEE standard compliance for the TPS23881B1RTQR.

Does TPS23881B1RTQR support both 2-pair and 4-pair PoE port configurations?

Yes, the TPS23881B1RTQR supports selectable 2-pair or 4-pair port power allocations per channel, enabling flexible deployment across IEEE 802.3af/at/bt standards. It delivers 15.4 W, 30 W, 45 W, 60 W, 75 W, or 90 W per port depending on configuration - with full Type 4 (90 W) capability confirmed in 4-pair mode. This configurability is implemented via register settings and does not require hardware changes for the TPS23881B1RTQR.

How does the Kelvin sensing architecture (KSENSA–KSENSD) improve current measurement accuracy in TPS23881B1RTQR?

The TPS23881B1RTQR uses four Kelvin sense terminals (KSENSA–KSENSD) to perform differential voltage measurements across its 0.200-Ω current sense resistors, eliminating errors from PCB trace resistance and contact impedance. Each KSENS pair serves two adjacent SEN pins (e.g., KSENSA for SEN1/SEN2), ensuring 2% current sensing accuracy even under high-current, thermally varying conditions - a critical capability for reliable power policing in the TPS23881B1RTQR.

Can TPS23881B1RTQR perform parallel classification on multiple ports simultaneously?

Yes, the TPS23881B1RTQR features dedicated 14-bit integrating ADCs per port that enable true parallel classification measurements. Unlike sequential architectures, this allows the TPS23881B1RTQR to execute classification on multiple ports concurrently - reducing aggregate port turn-on time by up to 30% and accelerating system boot in multi-camera NVR or high-port-count switch applications.

What thermal management features are integrated into TPS23881B1RTQR for high-power PoE 2 designs?

The TPS23881B1RTQR integrates inrush and operational foldback protection, fast overcurrent shutdown (<1 µs), and configurable current limit thresholds (1X/2X modes) to prevent MOSFET thermal runaway. Its VQFN-56 RTQ package includes an exposed thermal pad requiring low-impedance AGND/DGND connection, achieving 3.7°C/W junction-to-board thermal resistance - enabling compact, fanless designs for the TPS23881B1RTQR in 90-W PoE 2 systems.