OPB741 Equivalent & Substitute Parts

Part Overview

The OPB741 is a reflective optical sensor manufactured by TT Electronics/Optek Technology, designed for 0.150" (3.81mm) PCB mount applications. This phototransistor-based sensor detects reflected light and is commonly used in position sensing, object detection, and optical switching applications. The OPB741 is currently classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance requirements.

Substiute Parts

OPB741

TT Electronics/Optek TechnologyIn Stock: 1079OPB741 Datasheet

Current PartRFQ

OPB743

TT Electronics/Optek TechnologyIn Stock: 3246OPB743 Datasheet

DirectRFQ

OPB741WZ

TT Electronics/Optek TechnologyIn Stock: 1575OPB741WZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPB741 is determined by matching the following critical parameters:

• Sensing distance: 0.150" (3.81mm)
• Sensing method: Reflective
• Output type: Phototransistor
• Electrical specifications: 30 V collector-emitter breakdown voltage, 40 mA maximum forward current
• Environmental compliance: ROHS3 compliance, MSL 1 rating

Two substitute parts meet these criteria with variations in mounting configuration and product status.

Parameter Comparison

Engineering Selection Recommendations

OPB743 is the direct functional equivalent to OPB741, maintaining identical electrical specifications, sensing distance, and operating temperature range. Both are PCB mount through-hole components with equivalent performance characteristics. OPB743 is currently in active production status, making it the primary substitute for OPB741 obsolescence mitigation.

OPB741WZ is a manufacturer-recommended alternative that provides the same core optical sensing functionality with identical electrical parameters. However, this part differs in form factor: it is supplied as a pre-wired module with chassis mount configuration rather than a bare PCB mount component. The operating temperature range is reduced to -40°C ~ 80°C. Selection of OPB741WZ requires mechanical redesign to accommodate the module form factor and pre-wired interface.

Both substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original OPB741.

Frequently Asked Questions (FAQ)

Q: Can OPB743 be used as a direct replacement for OPB741 in existing PCB designs?

A: Yes. OPB743 maintains identical sensing distance (0.150"), sensing method (reflective), output type (phototransistor), electrical specifications (30 V breakdown, 40 mA forward current), and through-hole PCB mount configuration. No circuit modifications are required.

Q: What is the primary difference between OPB743 and OPB741WZ?

A: OPB743 is a bare PCB mount component identical to OPB741. OPB741WZ is a pre-wired module with chassis mount configuration. OPB741WZ requires mechanical redesign and different mounting approach. Additionally, OPB741WZ has a reduced operating temperature maximum of 80°C compared to 85°C for OPB741 and OPB743.

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both OPB743 and OPB741WZ are ROHS3 compliant with MSL 1 rating, matching the compliance profile of the original OPB741.

Q: Which substitute should be selected for new designs?

A: OPB743 is recommended for applications requiring direct form factor compatibility with OPB741. OPB741WZ is suitable only when the pre-wired module form factor and chassis mount configuration align with application requirements.

Q: Does the sensing distance remain constant across all three parts?

A: Yes. All three parts—OPB741, OPB743, and OPB741WZ—maintain the same 0.150" (3.81mm) sensing distance for reflective optical detection.