Agilent/Keysight 84904M

The Keysight 84904M is a programmable step attenuator for precise RF and microwave signal control across DC to 50 GHz. It delivers 0 to 11 dB attenuation in 1 dB increments with exceptional repeatability and switching speed, making it ideal for automated test systems requiring stable, repeatable attenuation performance.

– Technical Specifications

• Frequency Range: DC to 50 GHz
• Attenuation Range: 0 to 11 dB in 1 dB steps
• Insertion Loss: 0.8 dB + 0.04 dB/GHz (DC to 40 GHz); 3.0 dB at 50 GHz; less than 2.4 dB at 40 GHz (L models)
• Maximum SWR: 1.3 (1.3–12.4 GHz); 1.7 (12.4–34 GHz); 1.8 (34–40 GHz); 3.0 (40–50 GHz)
• Repeatability: 0.03 dB typical; 0.03 dB maximum over life
• Switching Cycles: Greater than 2 million per section; greater than 5 million per section (L models)
• Switching Time: Maximum 20 ms including contact settling; less than 10 ms for drivers
• Power Handling: 1 W average RF input; 50 W peak RF input
• Solenoid Type: Magnetic latching; drive voltage removable after switching
• Connectors: 2.4 mm female (standard); 2.4 mm male/female; optional 2.4 mm/2.92 mm (L models); 3.5 mm (K models, SMA/2.92 mm compatible); 2.92 mm (L models, SMA/3.5 mm compatible)
• Programming Interface: 10-pin sockets

– Key Features

• Miniature thin-film attenuation cards with tantalum nitride on sapphire or alumina substrate deliver high accuracy and stability
• Low insertion loss optimized for high-frequency applications
• Proven switching reliability exceeding 2 million cycles per section
• Compact, rugged construction for direct ATE integration

– Typical Applications

• RF and microwave signal level control in production and field test
• Automated test equipment requiring precise attenuation switching
• High-frequency measurement systems to 50 GHz

– Compatibility & Integration

Connector options support operation from DC through 50 GHz. The 2.4 mm connector delivers optimal performance and durability at maximum frequency. Magnetic latching solenoids enable cost-effective driver circuits and eliminate continuous hold power requirements.