onsemi NCP1094GEVB

Overview

NCP1094GEVB from onsemi is an IEEE 802.3at Power over Ethernet (PoE) Powered Device (PD) evaluation board built around the NCP1094 integrated PoE-PD interface controller in DFN10 package. It supports dual-event classification, auxiliary supply priority switching, and delivers up to 30 W compliant power with programmable inrush/operational current limiting - used for validating industrial PoE-powered cameras, access control terminals, and VoIP endpoints.

For engineers reviewing the NCP1094GEVB datasheet, pinout, applications, or equivalent options, this page provides verified functional context, key specifications, availability details, manufacturer background, and answers to common design questions about PoE-PD interface validation, AUX-supply handover timing, and IEEE 802.3at Type 2 compliance verification.

Technical Context

The NCP1094GEVB implements a complete IEEE 802.3at-compliant PD interface using the NCP1094 IC, which integrates detection, classification, UVLO, inrush/operational current limiting, thermal shutdown, and an open-drain NCLASS_AT indicator. Its circuit topology includes external R_DET, R_CLASS, and R_INRUSH resistors to configure signature impedance, classification current, and current-limit thresholds per IEEE standards.

It enables two distinct power-path configurations: PoE-dominant (with diode isolation for auxiliary supply) and auxiliary-dominant (via AUX pin pull-up to disable internal pass-switch), supporting seamless transition between PoE and rear auxiliary supplies without interrupting PGOOD status or DC-DC operation.

Key Specifications

Availability

NCP1094GEVB is available at Aetrix Electronics and suitable for industrial PoE endpoint development, security camera prototyping, and VoIP terminal qualification requiring stable component supply and validated reference designs.

Supply support for NCP1094GEVB 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer applications.

The NCP1094GEVB belongs to onsemi's HIPO (High Power PoE) evaluation platform family, designed specifically to accelerate IEEE 802.3at-compliant PD system validation - targeting industrial automation, smart building infrastructure, and rugged edge devices.

FAQ

What is the primary function of the NCP1094GEVB evaluation board?

The NCP1094GEVB evaluation board is a fully assembled and tested reference platform for the NCP1094 PoE-PD interface controller. It enables engineers to validate IEEE 802.3at Type 2 compliance, test dual-event classification behavior, verify AUX-supply priority switching, and characterize inrush/operational current limiting - all using the actual NCP1094 device in its native DFN10 package.

Does the NCP1094GEVB support both PoE and auxiliary supply operation?

Yes - the NCP1094GEVB demonstrates both PoE-dominant and auxiliary-dominant configurations. When the AUX pin on the NCP1094 is pulled high, the internal pass-switch disables, allowing external auxiliary power (e.g., 12 V or 24 V) to supply the downstream DC-DC converter without disrupting PGOOD status or causing power interruption.

How does the NCP1094GEVB indicate successful IEEE 802.3at Type 2 classification?

The NCP1094GEVB uses the NCLASS_AT signal (Pin 9 of the NCP1094) to indicate dual-event classification. When a Type 2 PSE completes hardware classification, NCLASS_AT is actively pulled low to RTN. This open-drain output can be monitored directly or interfaced with a microcontroller GPIO to trigger higher-power application modes in the NCP1094GEVB's target system.

What external components are required to operate the NCP1094GEVB?

The NCP1094GEVB includes all critical passive components: R_DET (24.9 kΩ), R_CLASS (configurable for Class 0–4), and R_INRUSH (169 kΩ default). Users only need to connect an IEEE-compliant PSE, optional auxiliary supply, and a downstream DC-DC converter - no additional resistors or layout changes are needed for baseline 802.3at validation.

Can the NCP1094GEVB be used to evaluate thermal performance of the NCP1094 IC?

Yes - the NCP1094GEVB exposes thermal pads and includes copper pour areas aligned with the NCP1094's exposed pad (EP), enabling direct junction-to-board thermal resistance measurement. The board supports real-time monitoring of thermal shutdown activation at 150 °C and confirms hysteresis recovery at ~135 °C - critical for industrial deployments where ambient temperatures reach +85 °C.