OPB685 Equivalent & Substitute Parts

Part Overview

The OPB685 is an optical sensor manufactured by TT Electronics/Optek Technology, designed as a PCB-mounted optical flag sensor for through-hole applications. This component is part of the Photologic® series and operates using optical flag sensing methodology with pull-up resistor and buffer output configuration.

The OPB685 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

OPB685

TT Electronics/Optek TechnologyIn Stock: 919OPB685 Datasheet

Current PartRFQ

OPB695AZ

TT Electronics/Optek TechnologyIn Stock: 1228OPB695AZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPB685 is determined by the following critical parameters:

• Sensing method: Optical flag detection
• Output configuration: Pull-up resistor with buffer output
• Response time: 30ns
• Operating temperature range: -40°C ~ 100°C
• Supply voltage compatibility: 4.5V minimum threshold
• RoHS3 compliance and REACH unaffected status
• Manufacturer series continuity: Photologic®

The OPB695AZ qualifies as a manufacturer-recommended substitute based on matching core sensing methodology, output configuration, response time, operating temperature range, and regulatory compliance. Differences in mounting type (snap-in versus through-hole), supply voltage range (4.5V ~ 8V versus 4.5V ~ 16V), and current consumption (20 mA versus 5.5 mA) must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The OPB695AZ is the manufacturer-recommended substitute for the obsolete OPB685. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

Selection of OPB695AZ requires verification of the following application-specific factors:

• Supply voltage availability: The OPB695AZ operates within 4.5V ~ 8V, which is a subset of the OPB685 range. Designs operating above 8V require alternative solutions.
• Current budget: The OPB695AZ draws 20 mA compared to the OPB685's 5.5 mA. Power supply capacity must accommodate this increase.
• Mechanical integration: The OPB695AZ uses snap-in mounting with connector interface, whereas the OPB685 uses through-hole PCB mounting. PCB layout and mechanical housing modifications may be necessary.
• Active product status: The OPB695AZ is actively manufactured, ensuring long-term availability and supply chain stability compared to the obsolete OPB685.

Frequently Asked Questions (FAQ)

Q: Can OPB695AZ directly replace OPB685 without design changes?

A: Direct replacement is not possible due to different mounting types. The OPB685 uses through-hole PCB mounting, while OPB695AZ uses snap-in mounting with connector interface. Mechanical redesign of the mounting structure is required.

Q: What is the impact of the different supply voltage ranges?

A: The OPB695AZ operates within 4.5V ~ 8V, which is narrower than the OPB685 range of 4.5V ~ 16V. If your application requires operation above 8V, the OPB695AZ is not suitable without additional voltage regulation circuitry.

Q: Does the increased current consumption of OPB695AZ affect system design?

A: The OPB695AZ draws 20 mA versus the OPB685's 5.5 mA. Power supply capacity and current budgeting must be recalculated. Thermal management and power dissipation considerations may apply depending on duty cycle and system architecture.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the OPB685 and OPB695AZ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is OPB695AZ recommended despite the differences?

A: The OPB695AZ is the manufacturer-recommended substitute because it maintains identical sensing methodology (optical flag), output configuration (pull-up resistor with buffer), response time (30ns), and operating temperature range (-40°C ~ 100°C). It is actively manufactured, ensuring supply availability. Differences in mounting, voltage range, and current consumption are application-dependent considerations rather than functional incompatibilities.

Q: What should I do if OPB695AZ does not meet my voltage or current requirements?

A: Contact the component manufacturer or authorized distributor for alternative optical flag sensors within the Photologic® series or equivalent product lines that match your specific electrical and mechanical requirements.