OPB755N Equivalent & Substitute Parts

Part Overview

The OPB755N 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 phototransistor-based sensor operates across a temperature range of -40°C to 85°C and is rated for collector currents up to 30 mA with a maximum collector-emitter breakdown voltage of 24 V.

The OPB755N is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value
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
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	PCB Mount

Substitute Part Grouping Explanation

Substitution eligibility for the OPB755N is determined by the following critical parameters:

Sensing Distance: 0.220" (5.59mm) — must match exactly
Sensing Method: Reflective — must match exactly
Output Type: Phototransistor — must match exactly
Electrical Ratings: Collector-emitter breakdown voltage (24 V max), collector current (30 mA max), and forward current (50 mA max) — substitute must meet or exceed these specifications
Operating Temperature Range: -40°C to 85°C minimum — substitute must support this range or a compatible subset
Mounting Compatibility: Physical form factor must be compatible with the application

The OPB755TZ qualifies as a manufacturer-recommended substitute based on these parameters. Both parts share identical sensing distance, sensing method, output type, and electrical ratings. The OPB755TZ operates across -40°C to 80°C, which covers the critical lower temperature threshold but has a slightly reduced upper limit of 80°C compared to the OPB755N's 85°C maximum.

Parameter Comparison

Parameter	OPB755N (Main Part)	OPB755TZ (Substitute)
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology
Category	Optical Sensors	Optical Sensors
Sensing Distance	0.220" (5.59mm)	0.220" (5.59mm)
Sensing Method	Reflective	Reflective
Output Type	Phototransistor	Phototransistor
Voltage - Collector Emitter Breakdown (Max)	24 V	24 V
Current - Collector (Ic) (Max)	30 mA	30 mA
Current - DC Forward (If) (Max)	50 mA	50 mA
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 80°C
Mounting Type	Through Hole	Chassis Mount
Package / Case	PCB Mount	Module, Pre-Wired
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The OPB755TZ is the manufacturer-recommended substitute for the OPB755N. Both components share identical optical and electrical specifications, ensuring functional compatibility in reflective sensing applications requiring 0.220" (5.59mm) detection distance and phototransistor output.

Key considerations for selection:

Product Status: The OPB755N is obsolete, while the OPB755TZ is active. Selection of the OPB755TZ ensures ongoing availability and supply chain continuity.

Compliance: The OPB755TZ is ROHS3 compliant, whereas the OPB755N is non-compliant. Applications subject to RoHS regulations require the OPB755TZ.

Mounting and Packaging: The OPB755N is a through-hole PCB mount component, while the OPB755TZ is a chassis mount module with pre-wired connections. Physical integration requirements must be evaluated to determine compatibility with existing PCB layouts or mechanical assemblies.

Operating Temperature: The OPB755TZ operates to 80°C maximum, compared to 85°C for the OPB755N. Applications requiring operation above 80°C may require design review.

Frequently Asked Questions (FAQ)

Q: Can the OPB755TZ directly replace the OPB755N in existing designs?

A: Electrical and optical specifications are identical, enabling functional substitution. However, mounting differences must be addressed. The OPB755N is through-hole PCB mount, while the OPB755TZ is chassis mount with pre-wired connections. Physical integration modifications may be required.

Q: What is the impact of the 5°C reduction in maximum operating temperature?

A: The OPB755TZ operates to 80°C maximum versus 85°C for the OPB755N. Applications operating continuously above 80°C require verification that the OPB755TZ meets thermal requirements. Most industrial and commercial applications operate within the 80°C limit.

Q: Why is RoHS compliance important for this substitution?

A: The OPB755TZ is ROHS3 compliant while the OPB755N is not. Products destined for markets with RoHS regulations must use compliant components. The OPB755TZ satisfies these regulatory requirements.

Q: Are the electrical ratings identical between both parts?

A: Yes. Both the OPB755N and OPB755TZ share identical collector-emitter breakdown voltage (24 V), collector current rating (30 mA), and forward current rating (50 mA). Electrical circuit design remains unchanged.

Q: What is the sensing distance specification for both parts?

A: Both the OPB755N and OPB755TZ operate at 0.220" (5.59mm) reflective sensing distance. Optical performance and detection range are equivalent.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message