OHN3019U Equivalent & Substitute Parts

Part Overview

The OHN3019U is a unipolar Hall Effect magnetic switch manufactured by TT Electronics/Optek Technology, designed for digital switching applications with open collector output. This component operates across a 4.5V to 24V supply range and features a TO-92-3 package for through-hole mounting. The OHN3019U is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

OHN3019U

TT Electronics / Optek TechnologyIn Stock: 1139OHN3019U Datasheet

Current PartRFQ

OHN3020U

TT Electronics/Optek TechnologyIn Stock: 5721OHN3020U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OHN3019U is determined by strict equivalence across the following critical parameters:

• Technology & Function: Hall Effect unipolar switch operation
• Polarization: South pole detection
• Electrical Interface: Open collector output with 25mA maximum output current
• Supply Voltage Range: 4.5V to 24V compatibility
• Supply Current: 7mA maximum
• Thermal Operating Range: -20°C to 85°C
• Package & Mounting: TO-92-3 through-hole configuration (3-SSIP case)
• Compliance: ROHS3 compliant, REACH unaffected

The OHN3020U qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. Differences in sensing range thresholds (trip and release points) do not preclude substitution when the application tolerates the specified sensing characteristics of the replacement part.

Parameter Comparison

Engineering Selection Recommendations

The OHN3020U is the designated manufacturer substitute for the obsolete OHN3019U. Both components maintain identical electrical specifications for supply voltage, supply current, output current, and operating temperature range. Both are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment for new designs and legacy system updates.

The primary distinction between these parts is product status: OHN3019U is obsolete while OHN3020U is active, with confirmed inventory availability (5624 units in stock). The OHN3020U operates with lower sensing thresholds (35mT trip, 5mT release versus 50mT trip, 12.5mT release), which represents improved sensitivity. Applications requiring the original OHN3019U sensing characteristics must evaluate whether the OHN3020U thresholds are compatible with system requirements.

Frequently Asked Questions (FAQ)

Q: Can OHN3020U directly replace OHN3019U in existing designs?

A: Yes, from an electrical and mechanical standpoint. Both components share identical supply voltage ranges (4.5V–24V), output current ratings (25mA maximum), and thermal operating ranges (-20°C to 85°C). The TO-92-3 package and through-hole mounting are identical. The primary consideration is the difference in magnetic sensing thresholds; applications must confirm that the OHN3020U trip point (35mT) and release point (5mT) are acceptable for the intended magnetic field environment.

Q: What is the significance of the sensing range difference?

A: The OHN3019U requires 50mT to trip and 12.5mT to release, while the OHN3020U trips at 35mT and releases at 5mT. This means the OHN3020U is more sensitive and responds to weaker magnetic fields. System designers must verify that the application's magnetic field strength and hysteresis requirements align with the OHN3020U characteristics.

Q: Are there packaging or compliance concerns with substitution?

A: No. Both parts use the 3-SSIP (TO-92-3) package for through-hole mounting. Both are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronics manufacturing and distribution.

Q: Why is OHN3019U listed as obsolete?

A: Product obsolescence is determined by the manufacturer. The OHN3020U, as an active product from the same OHN3000 series, is the recommended path for new procurement and design continuity.

Q: Are there other substitutes in the OHN3000 series?

A: Based on the provided data, OHN3020U is the specified manufacturer substitute. Evaluation of additional OHN3000 series variants requires comparison against the critical parameters: unipolar Hall Effect function, south pole polarization, open collector output, 4.5V–24V supply range, and TO-92-3 package.