OHN3175U Equivalent & Substitute Parts

Part Overview

The OHN3175U is a digital switch latch Hall Effect magnetic sensor manufactured by TT Electronics / Optek Technology in TO-92-3 package configuration. This component operates as an open collector output device with latch functionality, designed for magnetic field detection applications. The OHN3175U is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from both the original manufacturer and qualified third-party suppliers.

Substiute Parts

OHN3175U

TT Electronics / Optek TechnologyIn Stock: 1058OHN3175U Datasheet

Current PartRFQ

OHS3175U

TT Electronics/Optek TechnologyIn Stock: 1839OHS3175U Datasheet

MFR RecommendedRFQ

AH175-PG-A-A

Diodes IncorporatedIn Stock: 191874AH175-PG-A-A Datasheet

MFR RecommendedRFQ

AH175-PG-A-B

Diodes IncorporatedIn Stock: 15807AH175-PG-A-B Datasheet

MFR RecommendedRFQ

AH175-PG-B-A

Diodes IncorporatedIn Stock: 33365AH175-PG-B-A Datasheet

MFR RecommendedRFQ

AH175-PG-B-B

Diodes IncorporatedIn Stock: 6455AH175-PG-B-B Datasheet

MFR RecommendedRFQ

AH1751-PG-A-A

Diodes IncorporatedIn Stock: 4757AH1751-PG-A-A Datasheet

MFR RecommendedRFQ

AH1751-PG-B-A

Diodes IncorporatedIn Stock: 158320AH1751-PG-B-A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OHN3175U is determined by the following critical parameters:

Primary Compatibility Criteria:

• Hall Effect technology with latch function
• South pole polarization
• Open collector output configuration
• Through hole mounting
• 3-SIP / 3-SSIP package form factor
• ROHS3 compliance and REACH unaffected status

Electrical Parameter Ranges:

• Supply voltage overlap within 4.5V – 24V window
• Output current capability of minimum 25mA
• Operating temperature range that encompasses or exceeds -20°C to 85°C

Qualified Substitutes:

The OHS3175U (TT Electronics / Optek Technology) serves as the manufacturer's direct active replacement, offering extended temperature range (-40°C to 125°C) and higher sensing threshold (26mT trip, -26mT release) while maintaining identical electrical interfaces.

The AH175 series (Diodes Incorporated) comprises four variants with temperature-compensated operation and lower sensing thresholds (6mT to 8mT trip range). These parts maintain compatible supply voltage, output current, and package specifications.

The AH1751 series (Diodes Incorporated) provides enhanced output current capability (100mA maximum) with 7mT sensing threshold, suitable for applications requiring higher load drive capability.

Parameter Comparison

Engineering Selection Recommendations

OHS3175U (Manufacturer Direct Replacement): Select this part for applications requiring continuity with the original OHN3175U design while benefiting from active product status. The OHS3175U maintains identical electrical interfaces and package configuration. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin. The higher sensing threshold (26mT) represents a design change that must be evaluated against application requirements.

AH175 Series (Diodes Incorporated): These parts are suitable for new designs where lower sensing thresholds (6mT to 8mT) are acceptable. The extended operating temperature range (-40°C to 150°C) and temperature-compensated design provide enhanced performance stability. Supply voltage range is reduced to 4.6V – 20V; applications operating above 20V require alternative selection. Output current remains at 25mA maximum.

AH1751 Series (Diodes Incorporated): Select these parts when output current requirements exceed 25mA, with maximum capability of 100mA. Operating temperature range is -40°C to 125°C. Sensing threshold is 7mT. Supply voltage range is 4.6V – 20V. Temperature-compensated design ensures stable operation across the specified temperature range.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original OHN3175U.

Frequently Asked Questions (FAQ)

Q: Can OHS3175U directly replace OHN3175U in existing designs?

A: Electrical and mechanical compatibility is confirmed. The OHS3175U maintains identical supply voltage range (4.5V – 24V), output current (25mA), and package configuration (3-SSIP). The sensing threshold difference (26mT versus 18mT) must be evaluated for application-specific magnetic field detection requirements. Extended temperature range (-40°C to 125°C) provides additional operational margin.

Q: What is the primary difference between AH175 and AH1751 series?

A: The AH1751 series provides 100mA maximum output current compared to 25mA in the AH175 series. Both maintain identical supply voltage (4.6V – 20V), latch function, and open collector output. Sensing thresholds differ slightly (7mT for AH1751 versus 6mT to 8mT for AH175 variants). Select AH1751 when driving higher impedance loads or multiple logic inputs.

Q: Are there package differences between substitute parts?

A: All parts use 3-SIP or 3-SSIP package form factors suitable for through-hole mounting. Some AH175 variants specify "Formed Leads" while others do not; both configurations are mechanically compatible with standard through-hole PCB layouts. Verify lead forming specifications against PCB hole spacing if tight mechanical tolerances are required.

Q: What sensing threshold should I select?

A: The OHN3175U operates at 18mT trip threshold. OHS3175U increases this to 26mT. AH175 series ranges from 6mT to 8mT depending on variant. AH1751 series operates at 7mT. Selection depends on the magnetic field strength in the application. Lower thresholds (AH series) provide sensitivity to weaker magnetic fields; higher thresholds (OHS3175U) require stronger magnetic fields for activation.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original OHN3175U.

Q: What is the temperature compensation feature in AH175 and AH1751 parts?

A: Temperature compensation is a design feature that maintains stable sensing threshold performance across the operating temperature range. This feature is not present in the OHN3175U or OHS3175U. For applications operating across wide temperature ranges, temperature-compensated parts provide more consistent magnetic field detection performance.