Texas Instruments TPS2376DDA-H

Overview

TPS2376DDA-H from Texas Instruments is an IEEE 802.3af-compliant powered device (PD) controller with integrated 100-V, 0.58-Ω low-side MOSFET switch, 600-mA operational current limit, adjustable inrush current limiting via ILIM pin, and true open-drain power-good (PG) output referenced to RTN. It enables 26-W PoE designs over 100 m of CAT-5 cable from a 52-V minimum PSE supply.

For engineers reviewing the TPS2376DDA-H datasheet, TPS2376DDA-H pinout, TPS2376DDA-H application, or TPS2376DDA-H equivalent, this page delivers verified functional identity, confirmed SOIC-8 PowerPad™ package mapping, validated 8-pin terminal roles, exact IEEE 802.3af detection/classification thresholds, thermal shutdown behavior at 135°C, and real-world alternative selection guidance for high-power PoE systems.

Technical Context

The TPS2376DDA-H implements a state-machine–driven PoE interface with three distinct operational phases: detection (using 24.9-kΩ DET resistor), classification (via CLASS pin current sensing across 255–4420-Ω external resistor), and powered operation (with programmable inrush limit and fixed 625–900-mA operational current limit). Its UVLO circuit uses an external resistor divider on the UVLO pin to set turn-on (2.43–2.57 V) and turn-off (1.87–1.98 V) thresholds, enabling compliance with IEEE 802.3af voltage windows.

It features a true open-drain PG output that asserts high-impedance only after inrush current falls below 91% of the programmed limit for ≥150 µs - ensuring safe DC/DC converter startup - and includes thermal shutdown at 135°C with 20°C hysteresis. The internal 100-V-rated MOSFET supports operation up to 57-V input with ≤15-µA leakage at 30 V.

Key Specifications

Pinout & Package

TPS2376DDA-H is housed in an 8-pin SOIC package with exposed PowerPad™ (DDA suffix), measuring 4.89 mm × 3.90 mm. The PowerPad™ must be soldered directly to a large VSS copper fill area on the PCB for effective thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar powered device controller applications.

Compared with TPS2375-1PW and TPS2377-1D, the TPS2376DDA-H provides higher current capability (600 mA), programmable inrush control, auto-retry fault recovery, and superior thermal management via PowerPad™ - making it the only option among the three qualified for 26-W IEEE 802.3af-compliant PDs operating continuously at 85°C ambient.

Availability

TPS2376DDA-H is available at Aetrix Electronics and suitable for VoIP video phones, WiMAX access points, security cameras, and RFID readers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for industrial PoE deployments.

Supply support for TPS2376DDA-H 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and connectivity technologies.

The TPS2376DDA-H belongs to TI's Power-over-Ethernet (PoE) PD controller product line, engineered specifically for high-power, standards-compliant powered devices operating in industrial and enterprise infrastructure environments.

FAQ

What is the maximum continuous power the TPS2376DDA-H can deliver to the load?

The TPS2376DDA-H supports up to 26 W at the RTN pin when operating from a 52-V minimum PSE supply over 100 m of CAT-5 cable. This is achieved using its 600-mA operational current limit and low 0.58-Ω rDS(on), and is validated in TI's SLVS646B datasheet under recommended operating conditions. The TPS2376DDA-H itself does not regulate output voltage - it enables downstream DC/DC conversion of the PoE input.

How does the TPS2376DDA-H implement IEEE 802.3af detection and classification?

The TPS2376DDA-H implements detection using a 24.9-kΩ resistor between DET and VDD to create the required 25-kΩ signature, and classification by drawing precise current (2.2–41.2 mA) from VDD through an external resistor (255–4420 Ω) connected to CLASS. These currents are measured internally and compared against IEEE 802.3af thresholds - all functions are self-contained within the TPS2376DDA-H without external logic.

Can the TPS2376DDA-H be used in non-standard high-power PoE systems beyond IEEE 802.3af?

Yes - the TPS2376DDA-H is explicitly designed for non-standard high-power implementations. Its adjustable UVLO thresholds, programmable inrush limit, and 100-V input rating allow operation beyond IEEE 802.3af limits. TI documentation confirms that "a 26 W PD may be constructed" using the TPS2376DDA-H, and notes that "an end-to-end high power system may either redefine the CLASS power, or dispense with CLASS entirely."

What is the purpose of the PowerPad™ on the TPS2376DDA-H package?

The PowerPad™ on the TPS2376DDA-H is an exposed thermal pad on the underside of the SOIC-8 DDA package, electrically and thermally connected to VSS. It must be soldered to a large VSS copper pour on the PCB to achieve the specified thermal resistance (as low as 45°C/W). This is essential for dissipating heat during 600-mA operation at elevated ambient temperatures and prevents thermal shutdown in sustained 26-W applications.

Does the TPS2376DDA-H require external components for basic IEEE 802.3af compliance?

Yes - the TPS2376DDA-H requires five external passive components for full IEEE 802.3af compliance: a 24.9-kΩ resistor on DET, a classification resistor (255–4420 Ω) on CLASS, an inrush-programming resistor (125–1000 kΩ) on ILIM, and a two-resistor UVLO divider (combined value = 24.9 kΩ) on UVLO. The datasheet confirms these are mandatory for detection, classification, inrush control, and UVLO threshold setting - no internal trimming or calibration replaces them.