OPB991P55 Equivalent & Substitute Parts

Part Overview

The OPB991P55 is an optical sensor from TT Electronics/Optek Technology's Photologic® series, designed as a through-beam sensor with 0.125" (3.18mm) sensing distance and NPN open collector output configuration. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new designs. The OPB991P55 operates within a 4.5V to 16V supply range with 12mA current consumption and 70ns response time, suitable for industrial sensing applications requiring through-beam detection.

Substiute Parts

OPB991P55

TT Electronics/Optek TechnologyIn Stock: 980OPB991P55 Datasheet

Current PartRFQ

OPB991L11Z

TT Electronics/Optek TechnologyIn Stock: 1005OPB991L11Z Datasheet

MFR RecommendedRFQ

OPB991L51Z

TT Electronics/Optek TechnologyIn Stock: 2335OPB991L51Z Datasheet

MFR RecommendedRFQ

OPB991L55Z

TT Electronics/Optek TechnologyIn Stock: 1232OPB991L55Z Datasheet

MFR RecommendedRFQ

OPB991P11Z

TT Electronics/Optek TechnologyIn Stock: 1072OPB991P11Z Datasheet

MFR RecommendedRFQ

OPB991P51Z

TT Electronics/Optek TechnologyIn Stock: 1759OPB991P51Z Datasheet

MFR RecommendedRFQ

OPB991T11Z

TT Electronics/Optek TechnologyIn Stock: 2692OPB991T11Z Datasheet

MFR RecommendedRFQ

OPB991T51Z

TT Electronics/Optek TechnologyIn Stock: 5301OPB991T51Z Datasheet

MFR RecommendedRFQ

OPB991T55Z

TT Electronics/Optek TechnologyIn Stock: 4563OPB991T55Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OPB991P55 are qualified based on strict electrical and mechanical parameter matching within the OPB991 base product family. All substitute parts maintain identical specifications across the following critical parameters:

• Sensing Distance: 0.125" (3.18mm)
• Sensing Method: Through-Beam
• Output Configuration: NPN - Open Collector, Buffer
• Voltage Supply Range: 4.5V ~ 16V
• Current Supply: 12 mA
• Response Time: 70ns
• Operating Temperature Range: -40°C ~ 70°C
• Package Type: Module, Wire Leads
• Mounting Type: Chassis Mount

The primary distinction between the OPB991P55 and its active substitutes lies in packaging format (the original uses standard packaging while substitutes use bulk packaging with Z-suffix designation) and compliance status. All substitute parts are active products with ROHS3 compliance, whereas the OPB991P55 is obsolete and RoHS non-compliant.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the OPB991P55 across all electrical and mechanical parameters. Selection among the substitute options should be based on the following engineering considerations:

Product Status and Compliance: All substitute parts carry active product status with ROHS3 compliance certification, providing long-term supply assurance and regulatory alignment. The OPB991P55, being obsolete and RoHS non-compliant, presents supply discontinuity and regulatory compliance risks for new designs or system refreshes.

Inventory Availability: Substitute parts demonstrate varying inventory levels. OPB991T51Z offers the highest availability at 5218 units, followed by OPB991T55Z at 4526 units and OPB991T11Z at 2671 units. Lower inventory options include OPB991L51Z (2283 units), OPB991P51Z (1742 units), OPB991L55Z (1193 units), OPB991P11Z (1025 units), and OPB991L11Z (926 units).

Packaging Designation: All substitute parts utilize bulk packaging with Z-suffix designation, consistent with current manufacturing standards for the OPB991 series.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically interchangeable with the OPB991P55?

A: Yes. All substitute parts maintain identical electrical specifications including 4.5V to 16V supply voltage, 12mA current consumption, 70ns response time, and NPN open collector output configuration. They are direct functional equivalents.

Q: What is the significance of the Z-suffix in substitute part numbers?

A: The Z-suffix indicates bulk packaging format and ROHS3 compliance certification. This represents the current manufacturing standard for the OPB991 series, distinguishing active production parts from the obsolete OPB991P55.

Q: Can the OPB991P55 be used interchangeably with OPB991L55Z or OPB991T55Z?

A: From an electrical and mechanical standpoint, yes. However, the OPB991P55 is obsolete with limited remaining inventory (960 units), while OPB991L55Z and OPB991T55Z are active products with significantly higher availability. New designs should specify active substitute parts.

Q: Does the choice between L-series and P-series or T-series variants affect circuit performance?

A: No. All variants within the OPB991 family maintain identical electrical characteristics, sensing distance, response time, and operating parameters. Variant designation reflects internal manufacturing or packaging differences that do not impact functional performance.

Q: What compliance advantages do the substitute parts offer?

A: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements. The OPB991P55 is RoHS non-compliant, which may present regulatory barriers in applications subject to RoHS directives.

Q: Is there a preferred substitute part for new system designs?

A: Selection should prioritize active products with adequate inventory for your production volume requirements. OPB991T51Z, OPB991T55Z, and OPB991T11Z offer the highest inventory levels and represent optimal choices for volume production.