OHN3131U Equivalent & Substitute Parts

Part Overview

The OHN3131U is a unipolar Hall Effect magnetic switch manufactured by TT Electronics/Optek Technology, housed in a TO-92-3 package. This component functions as a digital switch with open collector output, designed for magnetic field detection applications across industrial and consumer electronics. The OHN3131U is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

OHN3131U

TT Electronics/Optek TechnologyIn Stock: 902OHN3131U Datasheet

Current PartRFQ

OHS3131U

TT Electronics/Optek TechnologyIn Stock: 1144OHS3131U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OHN3131U is determined by the following critical parameters:

• Function & Technology: Unipolar Hall Effect switch with open collector output
• Polarization: South Pole detection
• Package: TO-92-3 (3-SSIP) through-hole mounting
• Electrical Specifications: Supply voltage 4.5V ~ 24V, output current 25mA maximum
• Sensing Characteristics: Magnetic trip and release thresholds
• Compliance: ROHS3 compliance and REACH unaffected status

The OHS3131U qualifies as a direct substitute based on matching function, technology, polarization, package type, electrical ratings, and compliance certifications. Variations in sensing range and operating temperature represent acceptable parameter differences within the unipolar Hall Effect switch category.

Parameter Comparison

Engineering Selection Recommendations

The OHS3131U is the manufacturer-recommended substitute for the obsolete OHN3131U. Both components maintain identical electrical specifications for supply voltage, supply current, and output current ratings. The OHS3131U offers an extended operating temperature range (-40°C ~ 125°C versus -20°C ~ 85°C) and remains in active production status, ensuring long-term availability and supply chain continuity.

The OHS3131U exhibits different magnetic sensing thresholds (14.6mT trip and release versus 9.5mT and -5.9mT), which must be evaluated against application-specific magnetic field detection requirements. Both components maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can the OHS3131U directly replace the OHN3131U in existing designs?

A: The OHS3131U is electrically and mechanically compatible with the OHN3131U. Both components share identical package type (TO-92-3), supply voltage range (4.5V ~ 24V), output current rating (25mA), and open collector output configuration. The primary design consideration is the difference in magnetic sensing thresholds, which must be evaluated for the specific application.

Q: What is the difference in sensing range between these parts?

A: The OHN3131U operates at 9.5mT trip and -5.9mT release thresholds. The OHS3131U operates at 14.6mT trip and -14.6mT release thresholds. Applications requiring precise magnetic field detection at lower thresholds may require circuit-level adjustments or alternative component selection.

Q: Why is the OHN3131U obsolete?

A: The OHN3131U has been discontinued by the manufacturer. The OHS3131U represents the active production alternative within the same product family, offering improved temperature range and continued manufacturing support.

Q: Are both parts ROHS3 compliant?

A: Yes, both the OHN3131U and OHS3131U are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing.

Q: What is the temperature operating range difference?

A: The OHN3131U operates from -20°C to 85°C. The OHS3131U extends this range to -40°C to 125°C, providing broader thermal performance for applications requiring operation in extreme temperature environments.