Agilent/Keysight W2638A

The Agilent/Keysight W2638A is a BGA probe for accessing and analyzing LPDDR, LPDDR NVM, and mobile-DDR DRAM signals within ball grid array packages. It interposes between the DRAM and printed circuit board, enabling comprehensive state and timing measurements of DRAM buses - including DQ, DQS, and clock signals - without requiring design modifications. The probe supports both x16 (60 balls) and x32 (90 balls) package configurations at data rates up to 400 Mb/s and operates across a 1.5 GHz bandwidth.

Technical Specifications

• Product Type: LPDDR BGA Probe


• Supported DRAM Types: LPDDR SDRAM, LPDDR NVM, Mobile-DDR DRAM


• Package Configurations: x16 (60 balls), x32 (90 balls) - all signals accessible


• Data Transfer Rate: Up to 400 Mb/s


• Bandwidth: 1.5 GHz


• Operating Temperature: 0° to +100° C


• Maximum Altitude: 4,600 m (15,000 ft)


• Humidity: Up to 50% non-condensing

Key Features

• Buried resistor design minimizes capacitive loading and isolates signals


• Compatible with both leaded and lead-free solder finishes


• Tolerates lead-free soldering temperature profiles


• DRAM soldered to probe top side; operates at full speed without performance degradation


• S-parameter models available for de-embedding with InfiniiSim

Typical Applications

• LPDDR/Mobile-DDR DRAM characterization and validation


• JEDEC compliance testing and signal integrity analysis


• State and timing measurements on DRAM buses in mobile and embedded systems


• Full-speed in-circuit probing without PCB design changes

Compatibility & Integration Logic Analyzer Connection: Interfaces via E5384A and E5826A single-ended ZIF probes to Keysight 16800 Series, 16900 Series, or U4154A AXIe-based logic analyzer module. Oscilloscope Connection: Attaches to W2639A LPDDR scope adapter board and uses E2678A InfiniiMax socketed probe head for connection to Keysight Infiniium 80000, 9000, or 90000A Series oscilloscopes.