HP / Agilent 44473A 4×4 Two-Wire Matrix Switch Module

The HP/Agilent 44473A is a 4×4 two-wire matrix switch module that routes signals across 16 crosspoints using 2PST relays to simultaneously switch both Hi and Lo lines. Built for automated test systems, it delivers 43 channels per second scan rate and sub-microvolt thermal offset performance, making it suitable for precision measurement and signal routing in laboratory and production environments.

– Technical Specifications

Matrix & Switching
• 4×4 two-wire matrix configuration
• 2PST relays per crosspoint (Hi and Lo lines)
• Maximum scan rate: 43 channels/second
• Relay mechanical life: 10⁸ operations
• Thermal offset: <3 µV

Electrical Ratings
• Maximum voltage: 250 V DC or AC RMS
• Maximum current per channel: 2 A
• Maximum current per module: 8 A
• Maximum power per channel: 60 W; 125 VA
• Maximum power per module: 240 W; 500 VA
• Closed channel resistance: 10¹¹ Ω
• HI-LO DC isolation: >10¹⁰ Ω
• Channel-to-chassis DC isolation: >10¹⁰ Ω
• Open channel AC capacitance: <5 pF
• HI-LO AC capacitance: <40 pF
• Channel-to-chassis AC capacitance: <70 pF

Frequency Performance
• Insertion loss at 100 kHz: <0.30 dB
• Insertion loss at 1 MHz: <0.35 dB
• Insertion loss at 10 MHz: <0.90 dB
• Crosstalk at 1 MHz: <-56 dB
• Crosstalk at 10 MHz: <-36 dB

– Key Features

• Dual-line switching for simultaneous Hi and Lo control
• Low thermal offset enables precision analog measurements
• High DC isolation and low AC capacitance for signal integrity
• Long relay life supports high-cycle automated applications
• Scalable architecture—multiple modules form larger matrices

– Typical Applications

• Multipoint signal routing in automated test equipment
• Component characterization and functional testing
• Production test automation
• Laboratory measurement systems

– Compatibility & Integration

The 44473A is Option 013 for the HP/Agilent 3488A Switch/Control Unit and operates in 3499A/B/C mainframes. Terminal block connections are required and may be included or purchased separately. Multiple modules cascade to expand matrix size; multiplexers extend input/output flexibility. Instruction manuals and datasheets are available.