OPB122B Equivalent & Substitute Parts

Part Overview

The OPB122B is a through-beam optical sensor manufactured by TT Electronics / Optek Technology, designed for PCB mount applications with a 0.080" (2.03mm) sensing distance. This component is part of the Photologic® series and features totem pole inverted output configuration. The OPB122B is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

OPB122B

TT Electronics / Optek TechnologyIn Stock: 1216OPB122B Datasheet

Current PartRFQ

OPB120B

TT Electronics/Optek TechnologyIn Stock: 937OPB120B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the OPB122B is determined by the following critical parameters:

• Sensing Distance: 0.080" (2.03mm) — must match exactly for mechanical and optical alignment
• Sensing Method: Through-Beam — optical detection principle must remain consistent
• Mounting Type: Through Hole PCB Mount — physical installation method must be identical
• Voltage Supply Range: 4.75V ~ 5.25V — power supply compatibility
• Current Supply: 15 mA — circuit design compatibility
• Response Time: 70ns — signal timing requirements
• Operating Temperature Range: -40°C ~ 70°C — environmental operating conditions

The OPB120B qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. The primary difference is the output configuration: OPB122B features totem pole inverted output, while OPB120B features totem pole buffer output. This distinction requires circuit-level evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

The OPB120B is the manufacturer-recommended substitute for the obsolete OPB122B. Both components maintain identical electrical specifications, sensing characteristics, and environmental ratings. The OPB120B is currently in active production status, ensuring long-term availability and supply chain continuity.

The output configuration difference between the two parts (inverted versus buffer) is the primary consideration for substitution. Circuit designs utilizing the OPB122B's inverted output must be evaluated to determine compatibility with the OPB120B's buffer output configuration. Both components meet ROHS3 compliance and REACH requirements, supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the OPB120B directly replace the OPB122B in existing designs?

A: The OPB120B matches all critical electrical and mechanical parameters of the OPB122B. However, the output configuration differs (buffer versus inverted). Circuit-level compatibility must be assessed based on how the output signal is utilized in the application.

Q: What is the difference between totem pole inverted and totem pole buffer output?

A: Totem pole inverted output provides an inverted logic signal, while totem pole buffer output provides a non-inverted logic signal. The choice depends on the receiving circuit's input requirements and signal polarity expectations.

Q: Why is the OPB122B classified as obsolete?

A: Product obsolescence is determined by the manufacturer based on production discontinuation. The OPB120B represents the active alternative within the Photologic® series.

Q: Are there any packaging differences between OPB122B and OPB120B?

A: Both components use identical PCB mount through-hole packaging. The OPB120B is available in bulk packaging, while the OPB122B was available in standard packaging.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the OPB122B and OPB120B are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99, meeting current regulatory standards.

Q: What is the sensing distance specification, and why is it critical?

A: Both components feature a 0.080" (2.03mm) sensing distance for through-beam optical detection. This specification is critical for mechanical alignment and optical path design in the application.