Agilent/Keysight U4208A

The Keysight U4208A is a probe/cable assembly that connects DDR4 BGA interposers to Keysight logic analyzer modules for high-speed memory signal acquisition and analysis. It features a 61-pin ZIF probe connector on one end and dual 160-pin connectors on the other for direct attachment to AXIe and portable logic analyzer front panels. The U4208A integrates with the W4640A Series DDR4 BGA interposers and is a critical interface for detailed capture and characterization of address, command, and data signals across DDR4 memory buses.

Technical Specifications

• Probe Connector: 61-pin ZIF (Zero Insertion Force)


• Logic Analyzer Interface: Dual 160-pin direct-connect connectors


• Interposer Connection: Left wing interface to W4640A Series DDR4 BGA interposers


• Series Classification: U4200A-Series Probes and Cables


• Connector Designation: No RC configuration

Key Features

• Dual capture modes with U4164A: normal state mode for address and command signals; quad sample state mode for data signal capture


• Minimal loading on system under test (SUT) for accurate high-speed signal fidelity


• Direct integration with B4661A Memory Analysis Software, including factory-configured setups for W4640A interposers

Typical Applications Debug and validation of high-speed DDR4 memory interfaces in production test, design verification, and post-silicon analysis. Primary use case involves characterizing signal integrity, timing relationships, and protocol compliance on DDR4 memory buses in AXIe-based measurement systems.

Compatibility & Integration

• Primary Logic Analyzer: Keysight U4164A AXIe Logic Analyzer Module


• Secondary Logic Analyzers: U4154A/B AXIe modules; 16860-series portable logic analyzers (all requiring 160-pin front panel connectors)


• Interposers: Keysight W4640A Series DDR4 BGA interposers


• Software: B4661A Memory Analysis Software with pre-loaded default configurations