Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Over Ethernet (PoE) Controllers

Microchip Technology PD77020-011000

Name: PD77020-011000
Brand: Microchip Technology
SKU: PD77020-011000
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: PD77020-011000

Manufacturer:: Microchip Technology

Category:: Power Over Ethernet (PoE) Controllers

Package:: 32-VFQFN Exposed Pad

Datasheet:: PD77020-011000.pdf

Description:: IC PSE 32-QFN (5x5)

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:480

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

PD77020-011000 from Microchip Technology is a PoE Power Management Controller designed for IEEE 802.3bt/at/af PSE systems, operating in controller mode with the PD77728 Manager. It delivers multi-port power management including port mapping, priority assignment, real-time protection (RTP), and power budgeting across up to 16 power banks. It interfaces via I²C (400 kHz max) and supports LED stream control for status indication in enterprise switches.

For engineers reviewing the PD77020-011000 datasheet, PD77020-011000 pinout, PD77020-011000 application, or PD77020-011000 equivalent, key selection considerations include its role as a SAMD21-based host-side controller coordinating with PD77728 managers, its 32-pin QFN package with thermal ePAD, and its support for 15-byte protocol messaging, OSS signaling, and system-level power good translation.

Technical Context

The PD77020-011000 implements a hierarchical PoE control architecture where it acts as the high-level system orchestrator-managing port status, priority, and power allocation-while delegating low-level detection, classification, and inrush control to companion PD77728 devices. It uses two independent I²C interfaces: one (I2C_IN_SDA/I2C_IN_SCL) for host communication at ≤400 kHz, and another (I2C_OUT_SDA/I2C_OUT_SCL) for downstream communication with PD77728 managers.

It integrates LED stream output (LED_SCK/xLED_SS/LED_DO/xLED_OE) for real-time port status visualization and provides four dedicated Power Good inputs (PG1–PG4) to monitor external power supplies. Its reset and interrupt logic-including xRESET_IN, xINT_OUT, xI2C_MESSAGE_READY, and xSys_OK-enables deterministic host synchronization and fault reporting without polling overhead.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.0 V to 3.6 V (VDD/VDDA); ensures compatibility with standard 3.3 V system rails and stable operation across industrial temperature range.
I²C Clock Frequency	Up to 400 kHz (Fast Mode+); enables high-throughput command/response messaging with host processor and PD77728 managers.
Operating Temperature	−40 °C to +85 °C; qualified for deployment in uncontrolled environments such as wiring closets and industrial edge switches.
Junction-to-Ambient θJA	40.9 °C/W; defines thermal derating requirements for PCB layout-requires thermal ePAD connection and adequate copper area for sustained 16-bank operation.
ESD Rating	HBM ±2000 V, CDM ±500 V; meets IEC 61000-4-2 Level 3 immunity requirements for PoE system front-end controllers.
Package	32-pin QFN, 5 mm × 5 mm; surface-mount footprint with exposed thermal pad (ePAD) for efficient heat dissipation in space-constrained switch designs.
Core Architecture	Based on Microchip SAMD21 ARM Cortex-M0+ MCU; provides embedded firmware execution capability for real-time port arbitration and policy enforcement.

Pinout & Package

PD77020-011000 is housed in a 5 mm × 5 mm, 32-pin QFN package with an exposed thermal pad (ePAD) that must be connected to VSSA for thermal performance. The package complies with RoHS, Pb-free reflow profile (peak 260 °C), and MSL3 handling requirements.

Pin/Terminal	Circuit Role	Design Meaning
I2C_IN_SDA / I2C_IN_SCL	Host interface bidirectional data/clock	Carries 15-byte protocol messages between host processor and PD77020-011000; requires external pull-up resistors per AN4896.
I2C_OUT_SDA / I2C_OUT_SCL	Downstream I²C to PD77728	Drives I²C bus to multiple PD77728 managers; each line requires 2 kΩ pull-up for reliable multi-drop timing.
xRESET_IN / xRESET_OUT	Active-low reset interface	Enables synchronized reset propagation: host asserts xRESET_IN to reset PD77020-011000 and PD77728s via xRESET_OUT.
xINT_OUT / xINT_IN	Open-drain interrupt signaling	xINT_OUT signals host on event completion; xINT_IN aggregates interrupts from all PD77728s-reducing host polling load.
PG1–PG4	Dedicated Power Good inputs	Monitor status of up to four independent PoE power supplies; used by firmware to gate port enablement and enforce power budgeting.
LED_SCK / xLED_SS / LED_DO / xLED_OE	LED stream interface	Generates serial LED control signals for real-time port activity/status indication-eliminates need for external LED drivers or GPIO expansion.
OSS_OUT	OSS signaling output	Transmits One-Shot Signal (OSS) to PD77728 for precise timing-critical operations like inrush current control and RTP activation.
xSys_OK / xDISABLE_PORTS	System validity & port disable control	xSys_OK confirms controller readiness to host; xDISABLE_PORTS allows hardware-level emergency shutdown of all PoE ports.

Key Features

Feature	Design Value
Multi-bank power management	Supports up to 16 independent power banks-enabling scalable PSE designs from 8-port to 48-port switches without firmware redesign.
Real-Time Protection (RTP)	Hardware-accelerated fault response via OSS_OUT signaling to PD77728, enabling sub-10 µs overcurrent shutdown-critical for IEEE 802.3bt compliance.
15-byte host protocol	Structured message format for system/port status, temperature alarms, and chip temperature reads-reducing host software parsing complexity and latency.
Integrated LED stream controller	Four-pin LED interface drives cascaded LED chains directly-removing external shift registers and reducing BOM count in cost-sensitive SOHO switches.
Autoclass and power budgeting	Firmware-enforced automatic device classification and dynamic port power allocation-ensuring full utilization of available power while preventing overload.

Applications

Enterprise Switches	SOHO PoE Injectors
Use Scenario: 24-port managed Ethernet switch powering VoIP phones, wireless APs, and IP cameras across mixed-class devices. IC Role / Device Role / Timing Role: System-level PoE controller managing port priority, power budgeting, and LLDP-based power negotiation with powered devices. Use Value: Enables deterministic power allocation across 16 power banks-preventing oversubscription while supporting IEEE 802.3bt Type 4 (90 W) devices on select ports.	Use Scenario: Compact dual-port PoE injector delivering 30 W per port to security cameras and access control panels in retail environments. IC Role / Device Role / Timing Role: Centralized power manager coordinating with PD77728 to perform detection, classification, and inrush control on both ports simultaneously. Use Value: Reduces bill-of-materials by integrating LED status control and OSS signaling-eliminating discrete logic and timing ICs required in legacy injectors.
Industrial Routers	Commercial Wi-Fi Access Points
Use Scenario: DIN-rail mounted industrial router with integrated 8-port PoE, deployed in factory automation networks requiring −40 °C to +85 °C operation. IC Role / Device Role / Timing Role: Robust PoE system orchestrator providing PG input monitoring, temperature alarm reporting, and fail-safe port disable via xDISABLE_PORTS. Use Value: Ensures continuous operation under thermal stress-leveraging θJA = 40.9 °C/W and validated reflow profile for long-term reliability in harsh enclosures.	Use Scenario: Ceiling-mounted Wi-Fi 6 access point with built-in 4-port PoE, serving high-density office environments with mixed client loads. IC Role / Device Role / Timing Role: Embedded PoE controller enabling dynamic power redistribution among ports based on real-time load and LLDP power class feedback. Use Value: Increases total system uptime by implementing Real-Time Protection (RTP) with sub-10 µs response-preventing damage during short-circuit events on live ports.

Enterprise Switches

SOHO PoE Injectors

Use Scenario: 24-port managed Ethernet switch powering VoIP phones, wireless APs, and IP cameras across mixed-class devices.

IC Role / Device Role / Timing Role: System-level PoE controller managing port priority, power budgeting, and LLDP-based power negotiation with powered devices.

Use Value: Enables deterministic power allocation across 16 power banks-preventing oversubscription while supporting IEEE 802.3bt Type 4 (90 W) devices on select ports.

Use Scenario: Compact dual-port PoE injector delivering 30 W per port to security cameras and access control panels in retail environments.

IC Role / Device Role / Timing Role: Centralized power manager coordinating with PD77728 to perform detection, classification, and inrush control on both ports simultaneously.

Use Value: Reduces bill-of-materials by integrating LED status control and OSS signaling-eliminating discrete logic and timing ICs required in legacy injectors.

Industrial Routers

Commercial Wi-Fi Access Points

Use Scenario: DIN-rail mounted industrial router with integrated 8-port PoE, deployed in factory automation networks requiring −40 °C to +85 °C operation.

IC Role / Device Role / Timing Role: Robust PoE system orchestrator providing PG input monitoring, temperature alarm reporting, and fail-safe port disable via xDISABLE_PORTS.

Use Value: Ensures continuous operation under thermal stress-leveraging θJA = 40.9 °C/W and validated reflow profile for long-term reliability in harsh enclosures.

Use Scenario: Ceiling-mounted Wi-Fi 6 access point with built-in 4-port PoE, serving high-density office environments with mixed client loads.

IC Role / Device Role / Timing Role: Embedded PoE controller enabling dynamic power redistribution among ports based on real-time load and LLDP power class feedback.

Use Value: Increases total system uptime by implementing Real-Time Protection (RTP) with sub-10 µs response-preventing damage during short-circuit events on live ports.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PD77010-011000	Single-chip PoE controller with integrated PD77728 functionality; lacks separate host interface and LED stream outputs.	Suitable for compact, fixed-configuration PSEs where host microcontroller integration is not required.	Select PD77010-011000 only when full controller/manager integration is acceptable and LED control is handled externally.
MAX5984AEUB+	Analog Devices' standalone PoE controller with integrated 10-bit ADC and analog sensing; no ARM core or LED stream interface.	Used in legacy PSE designs requiring analog voltage/current monitoring instead of digital protocol-based management.	Choose MAX5984AEUB+ only if system architecture relies on analog feedback loops and does not require firmware-upgradable policies or multi-bank coordination.

Compared with PD77020-011000, the PD77010-011000 reduces component count but sacrifices host programmability and LED control, while the MAX5984AEUB+ offers analog precision at the cost of digital flexibility and scalability-making PD77020-011000 optimal for modern, software-defined PoE infrastructure.

Availability

PD77020-011000 is available at Aetrix Electronics and suitable for enterprise switches, SOHO PoE injectors, and industrial routers requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for PD77020-011000 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, FPGAs, and connectivity solutions, with global manufacturing and support infrastructure.

The PD77020-011000 belongs to Microchip's PoE Power Management Controller product line, designed specifically to serve as the intelligent host-side coordinator in multi-PD, multi-bank IEEE 802.3bt/at/af PSE systems.

FAQ

What is the primary function of the PD77020-011000 in a PoE system?

The PD77020-011000 serves as the high-level PoE Power Management Controller in IEEE 802.3bt/at/af systems, coordinating with PD77728 managers to handle port mapping, priority, power budgeting, and real-time protection. It executes firmware-based policies, communicates with the host via 15-byte I²C protocol, and manages LED status streams-making it essential for scalable, software-defined PSE architectures. PD77020-011000 does not perform physical layer detection or classification itself.

Does the PD77020-011000 integrate PoE detection and classification circuitry?

No, the PD77020-011000 does not integrate physical-layer PoE detection or classification circuitry. It operates exclusively in controller mode and relies on companion PD77728 devices to perform those functions. PD77020-011000 provides the system-level intelligence-such as port priority, power bank allocation, and LLDP interaction-while delegating analog signal conditioning and timing-critical operations to the PD77728.

How does the PD77020-011000 interface with the host processor?

The PD77020-011000 interfaces with the host processor using a dedicated I²C bus (I2C_IN_SDA/I2C_IN_SCL) supporting up to 400 kHz clock frequency and a structured 15-byte message protocol. Host communication includes system status, port status, temperature alarms, and chip temperature reads. The xI2C_MESSAGE_READY pin signals message readiness, and xINT_OUT provides interrupt-driven event notification-reducing polling overhead. PD77020-011000 does not require SPI or UART interfaces.

What is the purpose of the OSS_OUT pin on the PD77020-011000?

The OSS_OUT (One-Shot Signal Output) pin on the PD77020-011000 delivers precisely timed control pulses to PD77728 devices for time-critical PoE operations-including inrush current limiting, Real-Time Protection (RTP) activation, and port power-up sequencing. This hardware-synchronized signaling ensures deterministic sub-10 µs response-critical for meeting IEEE 802.3bt safety and timing requirements. PD77020-011000 generates OSS_OUT based on firmware policy decisions, not analog thresholds.

Can the PD77020-011000 operate independently without the PD77728?

No, the PD77020-011000 cannot operate independently as a complete PoE PSE solution. It requires at least one PD77728 device to handle physical-layer functions (detection, classification, inrush, power delivery). PD77020-011000 is architecturally dependent on the PD77728 for hardware-level PoE execution-its role is strictly supervisory and coordinative. Attempting to use PD77020-011000 without PD77728 results in non-functional PoE ports and undefined behavior.

PD77020-011000 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Type:: Controller (PSE)

Number of Channels:: 48

Power - Max:: -

Internal Switch(s):: No

Auxiliary Sense:: No

Standards:: 802.3bt (PoE)

Voltage - Supply:: 3V ~ 3.6V

Current - Supply:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN (5x5)

PD77020-011000 FAQ

1.How can I place an order for PD77020-011000 through Aetrix?

Please submit a Request for Quotation (RFQ) for PD77020-011000 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PD77020-011000 reliable?

The price and inventory of PD77020-011000 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PD77020-011000 is usually 5 days.

3.What payment methods are accepted for PD77020-011000?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PD77020-011000 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PD77020-011000?

PD77020-011000 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PD77020-011000 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PD77020-011000?

For technical support, including PD77020-011000 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PD77020-011000 requirements.

6.How does Aetrix verify that PD77020-011000 is sourced from the original manufacturer or authorized distributors?

All PD77020-011000 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PD77020-011000 meets industry standards.

7.What is the process for return or replacement of PD77020-011000?

All PD77020-011000 units undergo pre-shipment inspection (PSI). If there is an issue with PD77020-011000, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PD77020-011000 part is unused and in its original packaging.

Return procedure for PD77020-011000:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…