OPB668T Equivalent & Substitute Parts

Part Overview

The OPB668T is an optical sensor manufactured by TT Electronics/Optek Technology, designed as a through-beam photoelectric sensor with 0.125" (3.18mm) sensing distance and PCB mount configuration. This component operates with NPN open collector inverted output and is part of the Photologic® series. The OPB668T is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

OPB668T

TT Electronics/Optek TechnologyIn Stock: 1070OPB668T Datasheet

Current PartRFQ

OPB667N

TT Electronics/Optek TechnologyIn Stock: 955OPB667N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPB668T is determined by the following critical parameters that must remain consistent:

• Sensing distance: 0.125" (3.18mm)
• Sensing method: Through-beam optical detection
• Mounting configuration: Through hole PCB mount
• Supply voltage range: 4.5V ~ 16V
• Supply current: 12 mA
• Response time: 30ns
• Operating temperature range: -40°C ~ 100°C
• Package type: PCB mount

The OPB667N qualifies as a manufacturer-recommended substitute. Both components share identical sensing distance, sensing method, mounting type, electrical specifications, and thermal operating range. The primary difference lies in output configuration: the OPB668T features NPN open collector inverted output, while the OPB667N provides pull-up resistor inverted output. This distinction requires circuit-level evaluation to confirm compatibility with existing system designs.

Parameter Comparison

Engineering Selection Recommendations

The OPB667N is the manufacturer-recommended substitute for the obsolete OPB668T. Both components maintain identical core optical and electrical specifications, ensuring functional equivalence in through-beam sensing applications requiring 0.125" (3.18mm) detection distance.

The OPB667N offers the advantage of active product status, ensuring continued availability and supply chain reliability. Both parts maintain ROHS3 compliance and identical operating parameters across voltage, current, temperature, and response time specifications.

The output configuration difference between the two parts—NPN open collector versus pull-up resistor—represents the primary consideration for circuit integration. System designs must account for this output stage variation to ensure proper signal conditioning and logic interface compatibility.

Frequently Asked Questions (FAQ)

Q: Can the OPB667N directly replace the OPB668T in existing designs?

A: The OPB667N shares all critical optical and electrical parameters with the OPB668T. However, the output configuration differs: OPB668T uses NPN open collector output while OPB667N uses pull-up resistor output. Circuit-level compatibility must be evaluated based on the specific signal conditioning and logic interface requirements of the application.

Q: What is the primary reason for substituting the OPB668T?

A: The OPB668T is classified as obsolete. The OPB667N is the active equivalent from the same manufacturer and series, providing continued component availability and supply chain support.

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

A: Yes. Both the OPB668T and OPB667N operate as through-beam optical sensors with 0.125" (3.18mm) sensing distance and identical response time of 30ns.

Q: Do both parts support the same supply voltage range?

A: Yes. Both components operate across the 4.5V to 16V supply voltage range with 12 mA current consumption.

Q: What packaging formats are available?

A: The OPB668T packaging is not specified in available documentation. The OPB667N is supplied in tube packaging. Both use PCB mount configuration for through-hole installation.

Q: Are both parts compliant with environmental and regulatory standards?

A: Yes. Both the OPB668T and OPB667N are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.