Keysight (Agilent) E5404A Pro Series Soft Touch Connectorless Probe

The Keysight E5404A Pro Series Soft Touch Connectorless Probe delivers signal acquisition for logic analysis without traditional connector hardware. This single-ended probing solution integrates directly into PCB layouts via a industry-standard connectorless footprint, reducing mechanical footprint by 30% compared to earlier Pro Series designs. Micro spring-pin technology maintains signal integrity across board surface variations and minor contamination, while the top-side retention module eliminates back-side access requirements - critical for densely populated or thick board assemblies.

Technical Specifications

• Probe Type: Single-ended


• Total Channels: 34 (32 single-ended data channels, 2 single-ended clock channels)


• Maximum Data Rate: > 2.5 Gb/s


• Equivalent Load Capacitance: < 0.7 pF


• Minimum Signal Amplitude: 500 mV peak-to-peak


• Footprint: Industry-standard connectorless, 30% smaller than original Pro Series soft touch probes

Key Features

• Micro spring-pin contact technology accommodates uneven surfaces and residual contamination


• Top-side retention module mounts on probe side - no underside board access needed


• Single footprint design works across board thicknesses without specialized retention hardware


• Compatible with all board surface finishes, including lead-free


• Minimal loading: < 0.7 pF equivalent capacitance preserves signal fidelity in high-speed designs

Typical Applications

• High-speed digital signal acquisition above 2.5 Gb/s


• Logic analysis in space-constrained PCB layouts


• Testing on multilayer boards where back-side access is impractical


• Verification of lead-free and advanced surface finishes

Compatibility & Integration

• Requires industry-standard Pro Series soft touch connectorless footprint designed into target PCB


• Compatible with logic analyzers equipped with 40-pin cable connectors


• Operates across all standard board surface materials