OPB685-3 Equivalent & Substitute Parts

Part Overview

The OPB685-3 is an optical sensor manufactured by TT Electronics/Optek Technology, designed for PCB mount applications using optical flag sensing technology. This component features a pull-up resistor and buffer output configuration, operating across a 4.5V to 16V supply range with a 30ns response time. The OPB685-3 is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

OPB685-3

TT Electronics/Optek TechnologyIn Stock: 908OPB685-3 Datasheet

Current PartRFQ

OPB680

TT Electronics/Optek TechnologyIn Stock: 1238OPB680 Datasheet

MFR RecommendedRFQ

OPB680

TT Electronics/Optek TechnologyIn Stock: 1238OPB680 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPB685-3 is based on the following critical parameters that must align between the main part and substitute components:

Core Compatibility Criteria:

• Sensing Method: Optical Flag (required match)
• Mounting Type: Through Hole (required match)
• Package / Case: PCB Mount (required match)
• Operating Temperature Range: -40°C ~ 100°C (required match)
• Voltage Supply Range: 4.5V ~ 16V (required match)
• RoHS Status: ROHS3 Compliant (required match)
• Moisture Sensitivity Level: 1 (Unlimited) (required match)

The OPB680 qualifies as a manufacturer-recommended substitute. While the OPB680 employs a different output configuration (Transistor with Base-Emitter Resistor versus Pull-Up Resistor and Buffer), it maintains compatibility across all mandatory electrical and mechanical parameters, including sensing method, mounting configuration, temperature range, supply voltage compatibility, and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The OPB680 is the manufacturer-recommended substitute for the obsolete OPB685-3. Both components maintain identical compliance certifications (ROHS3, REACH Unaffected, EAR99 classification) and share the same HTSUS code, confirming regulatory and trade alignment.

The OPB680 is currently in active production status, ensuring availability for new designs and ongoing system support. The component maintains all critical electrical and mechanical parameters required for direct substitution within optical flag sensing applications.

The primary design consideration is the output configuration difference: the OPB685-3 provides buffered output with pull-up resistor, while the OPB680 provides transistor output with base-emitter resistor. Circuit-level interface modifications may be required to accommodate this output stage difference, depending on the receiving circuit design.

Frequently Asked Questions (FAQ)

Q: Can the OPB680 directly replace the OPB685-3 without circuit modifications?

A: Both components share identical sensing method (optical flag), mounting type (through hole), package configuration (PCB mount), operating temperature range (-40°C to 100°C), and supply voltage range (4.5V to 16V). However, the output configurations differ: OPB685-3 uses pull-up resistor with buffer, while OPB680 uses transistor with base-emitter resistor. Circuit interface compatibility depends on the receiving circuit design and must be evaluated at the application level.

Q: Why is the OPB685-3 listed as obsolete?

A: The OPB685-3 has been discontinued by the manufacturer. The OPB680, which is in active production, serves as the recommended alternative for new designs and system replacements.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, classified as EAR99, and share the same HTSUS code (8541.49.8000). Regulatory and environmental compliance are equivalent.

Q: What is the moisture sensitivity level for these optical sensors?

A: Both the OPB685-3 and OPB680 carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are both components available in the same packaging format?

A: Both components use PCB mount through-hole packaging. The OPB685-3 packaging is listed as standard, while the OPB680 is available in bulk packaging. The physical footprint and mounting configuration remain compatible.