Microchip Technology USB3500-ABZJ

Overview

USB3500-ABZJ from Microchip Technology is a stand-alone Hi-Speed USB 2.0 Physical Layer Transceiver (PHY) with UTMI+ interface, supporting host/device/OTG roles, HS/FS/LS data rates up to 480 Mbps, integrated 24 MHz oscillator, and internal 1.8 V regulators for single 3.3 V supply operation - deployed in portable media players, scanners, and OTG-capable mobile devices.

For engineers reviewing the USB3500-ABZJ datasheet, USB3500-ABZJ pinout, USB3500-ABZJ application, or USB3500-ABZJ equivalent, key selection considerations include UTMI+ Level 3 compliance, OTG protocol support (HNP/SRP), low-power suspend current (83 µA), 56-pin QFN package thermal performance, and compatibility with SoC/FPGA link interfaces requiring minimal analog PHY integration effort.

Technical Context

The USB3500-ABZJ implements a dual-mode analog transceiver core with separate HS and FS/LS paths, controlled via XCVRSEL[1:0] and TERMSEL inputs. Its UTMI+ Level 3 interface supports preamble packet handling for FS hubs with LS devices and includes dedicated OTG monitoring circuitry for VBUS, ID, and session state detection.

It integrates a 24 MHz crystal oscillator (XI/XO) or external clock input, a 480 MHz PLL for HS operation, internal 1.8 V regulators for digital/analog domains (VDD1.8/VDDA1.8), and on-die termination control (Rpu_dp/Rpd_dm) with configurable pull-up/down enable via DPPD/DMPD pins - all synchronized to a 60 MHz CLKOUT reference.

Key Specifications

Pinout & Package

USB3500-ABZJ is housed in a 56-pin QFN package (8 mm × 8 mm × 0.90 mm height) with exposed ground flag requiring via array connection to PCB ground plane for thermal and EMI integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 PHY applications.

Compared with USB334x and ISP1504HN, USB3500-ABZJ uniquely delivers UTMI+ Level 3 compliance with integrated oscillator and 83 µA suspend current - making it the only option for low-power, OTG-enabled, FPGA/SoC-based designs requiring strict timing alignment and minimal analog subsystem design effort.

Availability

USB3500-ABZJ is available at Aetrix Electronics and suitable for portable media players, industrial printers, medical imaging peripherals, and OTG-capable handheld devices requiring stable component supply across extended production lifecycles.

Supply support for USB3500-ABZJ 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, and connectivity solutions with broad industrial and automotive qualification.

USB3500-ABZJ belongs to Microchip's USB transceiver product line, designed specifically to offload analog PHY complexity from SoCs and FPGAs while enabling flexible OTG, host, and device roles in portable and embedded systems.

FAQ

What USB data rates does the USB3500-ABZJ support?

The USB3500-ABZJ supports High-Speed (480 Mbps), Full-Speed (12 Mbps), and Low-Speed (1.5 Mbps) USB 2.0 data rates. It implements separate HS and FS/LS transceiver paths selected via XCVRSEL[1:0], and includes FS preamble support for FS hubs with LS devices - all verified per USB-IF Hi-Speed certification and UTMI+ Level 3 compliance.

Does USB3500-ABZJ require an external crystal?

No, USB3500-ABZJ integrates a 24 MHz crystal oscillator with XI/XO pins; it supports either a 24 MHz crystal across those pins or a 24 MHz external clock driven into XI. The internal PLL then generates the 480 MHz clock required for Hi-Speed operation - eliminating need for external oscillators in most designs.

How does USB3500-ABZJ implement On-The-Go (OTG) functionality?

USB3500-ABZJ implements full OTG via dedicated analog comparators monitoring VBUS and ID lines, plus control signals including CHRGVBUS, DISCHRGVBUS, SESSEND, SESSVLD, and VBUSVLD. It supports Host Negotiation Protocol (HNP) and Session Request Protocol (SRP), enabling dynamic role switching between host and peripheral using a single Mini-AB connector - all without host CPU intervention.

What is the power architecture of USB3500-ABZJ?

USB3500-ABZJ operates from a single 3.3 V supply (VDD3.3) and internally generates regulated 1.8 V supplies for digital (VDD1.8) and analog (VDDA1.8) domains. It draws 55 mA when unconfigured and only 83 µA in suspend mode - making it ideal for bus-powered and battery-operated applications where supply simplicity and low quiescent current are critical.

Is USB3500-ABZJ compatible with UTMI+ Level 3?

Yes, USB3500-ABZJ is explicitly designed for UTMI+ Level 3 compliance, supporting HS, FS, LS, and FS preamble packet handling - unlike Level 2 or Level 1 PHYs. This enables interoperability with advanced SoC/FPGA controllers requiring full feature support for complex USB topologies, including FS hubs with attached LS devices.