HO Series

The HO Series current sensors are designed for the precise electronic measurement of DC, AC, and pulsed currents, while providing reliable galvanic isolation between the primary and secondary circuits. Based on open‑loop Hall‑effect technology, the HO Series delivers accurate and stable current measurement for a wide range of industrial applications.

Covering nominal current ranges from 6 ARMS up to 250 ARMS, the HO Series offers a broad portfolio of mechanical and functional variants to meet diverse integration requirements. Most HO sensors are designed for PCB mounting, available in through‑hole and surface‑mount versions, while selected models, such as the HO‑S and HO‑SW variants, are intended for panel mounting and feature a 15 × 8 mm aperture for the primary conductor.

Within the HO Series, sensors are available with either analog or digital outputs. Analog variants provide high accuracy, short response time, and low offset and gain drift. Digital output variants integrate an onboard Sigma‑Delta Modulator and deliver a Pulse Density Modulation (PDM) bitstream, enabling direct digital interfacing and enhanced signal processing flexibility.

Advanced parts of the HO Series include multirange and programmable sensors. Multirange versions allow accurate measurement of lower nominal currents using multiple primary pins, while programmable variants offer configurable current ranges, programmable response time, adjustable overcurrent detection thresholds, and multiple programmable internal reference voltages.

Across all variants, the HO Series combines compact design, flexible mounting options, and versatile output interfaces, including CMOS, RS422, and LVDS, to provide a comprehensive and adaptable current sensing solution for modern industrial electronic systems.

Main characteristics

• Open‑loop Hall‑effect current transducers
• Measurement of DC, AC, and pulsed currents
• Galvanic isolation between primary and secondary circuits
• High insulation capability, insulated test voltage up to 4300 V
• Single supply +5 V operation
• Low power consumption
• Factory calibrated
• Fixed or adjustable offset and sensitivity, depending on the variant
• Fast response time and high dynamic performance
• 8 mm creepage and clearance, ensuring reliable insulation

Mounting options

• PCB mounting (through‑hole or surface mount) for most HO variants
• Panel mounting for selected models (e.g. HO‑S, HO‑SW) with 15 × 8 mm aperture
• Compact mechanical design with repositionable mounting foot on panel‑mount versions

Output options within the HO Series

Analog output variants

• Voltage output
• Over‑current detection typically between 2.6 × Ipn and 2.9 × Ipn (peak value), depending on the model
• Memory check functionality
• Multirange capability on selected versions (HO‑NP, HO‑NSM) using PCB layout configuration

Digital output variants

• Bitstream output from an onboard 2nd‑order Sigma‑Delta modulator
• Pulse Density Modulation (PDM) technology
• Over‑current detection around 2.97 × Ipn (peak value)
• EEPROM control
• Digital interfaces available across the series, including: 
  • 2‑wire CMOS
  • 2‑wire RS422 Manchester
  • 2‑wire LVDS Manchester
  • 4‑wire RS422
  • 4‑wire LVDS

Advanced & programmable features

(Available on selected variants such as HO‑NPPR)

• Multirange current measurement via PCB layout or ASIC programming
• Extremely low profile (height: 12 mm)
• Adjustable offset and sensitivity
• Programmable over‑current detection thresholds
• Adjustable response time and noise level
• Vref pin with configurable REF OUT / REF IN modes
• Standby mode with reduced power consumption
• Programmable current ranges
• Vref disable capability