OPB755T Equivalent & Substitute Parts

Part Overview

The OPB755T is a reflective optical sensor manufactured by TT Electronics/Optek Technology, designed for PCB mount applications with a 0.220" (5.59mm) sensing distance. This component operates as a phototransistor output device suitable for reflective sensing applications across industrial and consumer electronics. The OPB755T is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

OPB755T

TT Electronics/Optek TechnologyIn Stock: 1056OPB755T Datasheet

Current PartRFQ

OPB755TZ

TT Electronics/Optek TechnologyIn Stock: 1015OPB755TZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPB755T is determined by strict alignment of core electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Critical Matching Parameters:

• Sensing distance: 0.220" (5.59mm)
• Sensing method: Reflective
• Output type: Phototransistor
• Voltage - Collector Emitter Breakdown (Max): 24 V
• Current - Collector (Ic) (Max): 30 mA
• Current - DC Forward (If) (Max): 50 mA
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The OPB755TZ qualifies as a direct substitute based on identical electrical performance specifications and sensing characteristics. The primary distinction lies in mounting configuration and product status, with OPB755TZ offered as an active product in module, pre-wired form factor versus the obsolete PCB mount configuration of OPB755T.

Parameter Comparison

Engineering Selection Recommendations

The OPB755TZ serves as the active product continuation for OPB755T applications. Selection between these components depends on design integration requirements:

OPB755T remains suitable for legacy system maintenance where existing PCB mount through-hole designs are in place and RoHS non-compliance is acceptable within regulatory scope.

OPB755TZ is the preferred selection for new designs and production continuity. This component maintains identical electrical performance and sensing specifications while offering active product status, ROHS3 compliance, and pre-wired module configuration. The operating temperature range of -40°C ~ 80°C covers the majority of industrial applications; designs requiring operation above 80°C must evaluate thermal requirements against the OPB755T specification of -40°C ~ 85°C.

The transition from PCB mount to chassis mount configuration requires mechanical redesign of the sensor mounting interface. Pre-wired module construction eliminates discrete component assembly steps.

Frequently Asked Questions (FAQ)

Q: Can OPB755TZ directly replace OPB755T in existing PCB designs?

A: Electrical substitution is valid based on identical voltage, current, and sensing specifications. Mechanical integration requires redesign due to mounting type change from through-hole PCB mount to chassis mount configuration. Pre-wired module construction of OPB755TZ eliminates discrete wiring requirements present in OPB755T designs.

Q: What is the impact of the 5°C operating temperature range difference?

A: OPB755T operates to 85°C maximum; OPB755TZ operates to 80°C maximum. Applications requiring sustained operation above 80°C must retain OPB755T or evaluate alternative sensor families. Most industrial reflective sensing applications operate within the -40°C ~ 80°C range of OPB755TZ.

Q: Does RoHS3 compliance of OPB755TZ affect compatibility?

A: RoHS3 compliance of OPB755TZ represents an improvement over the non-compliant status of OPB755T. Designs subject to RoHS regulations must transition to OPB755TZ. Designs without RoHS requirements may use either component based on availability and mechanical constraints.

Q: Are the sensing distance and reflective method identical between parts?

A: Yes. Both OPB755T and OPB755TZ maintain 0.220" (5.59mm) sensing distance and reflective sensing method. Phototransistor output characteristics are identical, ensuring functional equivalence in reflective detection applications.

Q: What inventory considerations apply to these parts?

A: OPB755T is classified as obsolete with 1011 pieces in stock. OPB755TZ is active product with 987 pieces in stock. Long-term design support requires transition to OPB755TZ to ensure sustained component availability.