HPA01043PWPR - IEEE 802.3at PoE Interface + DC-DC Controller | TI
MPN: HPA01043PWPR ✓ Active| Qty | Unit Price | Extended |
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HPA01043PWPR Overview
A PoE PD interface is the front-end circuit that performs detection, classification, and inrush-current limiting when a device such as an IP camera, wireless access point, or network switch is powered over Ethernet cabling. It sits within the power management IC hierarchy, bridging the IEEE 802.3at physical layer and the downstream isolated or non-isolated DC-DC converter that generates the system rails.
Key features include full compliance with the IEEE 802.3at high-power PoE standard, integrated detection and classification signature circuits, and a built-in current-mode DC-DC controller with a maximum switching frequency of 278 kHz, enabling compact magnetics and high conversion efficiency. The device supports up to 1.1 A output current capability in switching controller operation, and the PowerPAD HTSSOP-20 package provides low thermal impedance for high-power PD designs.
Technically, the PD interface handles the 25 kOhm detection signature, class signaling, and controlled inrush startup, while the PWM section uses peak current-mode control for cycle-by-cycle current limiting, good transient response, and straightforward loop compensation. This single-chip integration reduces external component count compared to a discrete PD controller plus separate PWM controller solution, improving reliability and BOM cost in high-volume network hardware.
Typical applications include IEEE 802.3at powered IP network cameras, 802.11ac/ax wireless access points, VoIP phones, PoE-enabled LED lighting drivers, and industrial Ethernet endpoints that must draw 25.5 W or more from the PSE.
Design consideration: verify the external MOSFET and sense resistor ratings against the inrush and fault current limits, and follow the PowerPAD layout guidance for thermal dissipation.
This page synthesizes distributor data, cross-reference alternatives, and practical design notes not found in the manufacturer datasheet, with pricing verified as of 2026-10-19.
Drop-in alternatives for HPA01043PWPR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS23754PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS23755PWPR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS2378PWPR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
HPA01043PWPR Maximum Ratings & Electrical Characteristics
| Function | PoE Interface and DC-DC Controller |
| PoE Standard | IEEE 802.3at (High Power PoE) |
| Role | Powered Device (PD) Interface with integrated PWM controller |
| Control Topology | Current-mode PWM |
| Maximum Switching Frequency | 278 kHz |
| Maximum Output Current | 1.1 A |
| Number of Terminals | 20 |
| Package | HTSSOP-20 (PWP) with PowerPAD |
| Package Shape | Rectangular |
| Terminal Pitch | 0.65 mm |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C |
| Temperature Grade | Automotive |
| Category (DigiKey) | Power Switch ICs - POE / LAN |
HPA01043PWPR rectangular Pin Configuration Guide
Pin configuration for HPA01043PWPR (rectangular package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for HPA01043PWPR.
Refer to the datasheet for full pin configuration.
Typical Applications
HPA01043PWPR is suitable for 6 applications: IP Network Cameras, Wireless Access Points, VoIP Phones and Network Endpoints, PoE LED Lighting Drivers, Industrial Ethernet Endpoints, Building Automation and Security Panels.
IP Network Cameras
The HPA01043PWPR fits IP camera designs because its IEEE 802.3at PD interface delivers up to the full 25.5 W class power from a single Ethernet cable while its integrated 278 kHz current-mode controller efficiently converts the roughly 48 V PoE rail to 12 V, 5 V, or 3.3 V camera system rails. Detection, classification, and inrush limiting are handled on-chip, guaranteeing a compliant handshake with the PSE without extra supervisory circuitry. Placed at the Ethernet magnetics output with the external pass MOSFET and sense resistor, it feeds a flyback or buck stage whose transformer can be compact thanks to the 278 kHz switching. The -40C to +125C range tolerates outdoor and ceiling-mount enclosures, and the PowerPAD HTSSOP-20 dissipates conversion heat through the PCB without a heatsink, keeping camera form factors small.
Recommended
Wireless Access Points
802.11ac/ax wireless access points frequently exhaust 802.3af power budgets, and the HPA01043PWPR addresses this by supporting the IEEE 802.3at high-power standard for up to 25.5 W at the PD. Its integrated PD signature circuits perform the two-event classification needed for the PSE to allocate full at-power, while the 278 kHz current-mode PWM controller converts the PoE input into the 12 V intermediate rail feeding RF power amplifiers and the SoC core supplies. The 1.1 A controller output capability plus external MOSFET scaling accommodates peak RF transmit bursts, and cycle-by-cycle current limiting protects the radio front end during fault conditions. The automotive -40C to +125C grade also suits outdoor AP enclosures where ambient temperatures swing widely across seasons.
Recommended
VoIP Phones and Network Endpoints
VoIP desk phones benefit from the HPA01043PWPR's single-chip integration of the IEEE 802.3at PD interface and the DC-DC controller, which eliminates a separate PWM IC, reduces BOM count, and frees board area for the handset audio codec and display circuitry. The on-chip detection signature and inrush control ensure the phone powers up cleanly when plugged into any compliant switch port, while the 278 kHz converter converts the PoE input to 5 V and 3.3 V rails for the CPU, Ethernet PHY, and audio stages. Current-mode control gives good line rejection against PoE cable voltage variation across long cable runs, and the PowerPAD package thermally couples losses into the phone's ground plane, avoiding hot spots inside a sealed plastic housing.
Recommended
PoE LED Lighting Drivers
PoE-connected LED luminaires use the HPA01043PWPR to accept power directly from structured cabling: the PD interface completes detection and classification with the PSE, and the integrated 278 kHz controller drives a flyback or buck stage that regulates LED string current. The IEEE 802.3at power class supports brighter fixtures than 802.3af, and the 1.1 A controller capability with an external MOSFET scales to higher string currents. Current-mode control simplifies the constant-current loop compensation, and cycle-by-cycle limiting protects the LEDs during cable faults or hot-plug events. The -40C to +125C automotive temperature grade matches enclosed luminaire thermal environments, and the PowerPAD HTSSOP-20 passes dissipation into the metal luminaire housing through the PCB copper.
Recommended
Industrial Ethernet Endpoints
Factory-floor sensors, IIoT nodes, and industrial switches benefit from the HPA01043PWPR's wide -40C to +125C operating range and automotive temperature grade, which survive cabinet and machine-mount environments where consumer-grade parts fail. Its IEEE 802.3at PD interface extracts up to 25.5 W over the Ethernet run, powering the node without a separate field-wired supply, and the 278 kHz current-mode controller generates the logic and actuator rails with cycle-by-cycle protection against cable faults. The integrated inrush limiting prevents nuisance tripping of the PSE during capacitive start-ups common in industrial nodes. The 20-pin HTSSOP PowerPAD package supports the high-vibration, thermally demanding conditions of industrial enclosures through robust gull-wing solder joints and PCB copper heat spreading.
Recommended
Building Automation and Security Panels
Door controllers, access panels, and security system hubs use the HPA01043PWPR to combine PoE power acquisition and local conversion in one device. The IEEE 802.3at interface classifies and negotiates the higher power allocation needed for locks, readers, and standby batteries, while the 278 kHz controller steps the PoE rail to the 12 V panel bus with high efficiency. Integrated detection and inrush control guarantee compatibility with mixed-vendor PSE switches across a building, and current-mode control maintains regulation during the load transients typical of lock actuation. The -40C to +125C range covers unconditioned riser closets and rooftop equipment, and the PowerPAD thermal design keeps junction temperature within limits inside sealed panel enclosures without forced airflow.
Recommended
Recommended Products Summary
Engineering reference data for HPA01043PWPR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS23754PWPR | TPS23755PWPR | TPS2378PWPR |
|---|---|---|---|---|
| Package | HTSSOP-20 (PWP) with PowerPAD | HTSSOP-20 (PWP) - same | HTSSOP-20 (PWP) - same | HTSSOP-20 (PWP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| PoE Standard | IEEE 802.3at | IEEE 802.3at | IEEE 802.3at | IEEE 802.3at |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Controller Architecture | External current-mode PWM controller | External current-mode PWM controller - same | Integrated converter stage | PD interface with controller variant |
| Terminals / Pitch | 20 / 0.65 mm | 20 / 0.65 mm | 20 / 0.65 mm | 20 / 0.65 mm |
Key Differentiators
- Catalog part-number availability (vs TPS23754PWPR)
- Topology flexibility via external PWM controller (vs TPS23755PWPR)
- IEEE 802.3at high-power compliance in one chip (vs TPS2378PWPR)
Design Notes
The HTSSOP-20 (PWP) PowerPAD package relies on the exposed die pad soldered to the PCB for heat removal. Connect the PowerPAD to a solid ground plane with an array of thermal vias (typically a 3x3 or larger pattern of filled vias) under the pad. In an IEEE 802.3at design dissipating several watts at full 25.5 W load, insufficient PowerPAD soldering is the leading cause of thermal shutdown; verify solder coverage via X-ray on first-article boards and confirm junction temperature stays below the rated limit at worst-case ambient.
Size the external pass MOSFET and current-sense resistor for both the IEEE 802.3at inrush profile (controlled ramp to the operating current) and the 1.1 A controller output capability. The sense resistor sets cycle-by-cycle current limit - choose its value so the MOSFET current rating exceeds the limit with margin, and verify the MOSFET's gate-drive compatibility with the controller output. Design the flyback or buck magnetics for the actual programmed frequency within the 278 kHz maximum to balance transformer size against switching loss.
The HPA01043 prefix is a non-catalog designation: distributor cross-references map it to the TI TPS23754PWPR. For new designs and production sourcing, order and document the TPS23754PWPR to avoid obsolescence and stocking confusion. Also verify IEEE 802.3at classification programming - incorrect class resistor settings cause the PSE to allocate only 802.3af power, leading to brown-outs at full load. Confirm classification behavior with a PoE conformance test set before deployment.
Compliance Information
Vyrian lists the part with an automotive temperature grade (-40C to +125C), but formal AEC-Q100 qualification status is not stated in the available data. RoHS/REACH status should be confirmed on the TI product page for the catalog-equivalent TPS23754PWPR.
