OPL551 Equivalent & Substitute Parts

Part Overview

The OPL551 is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a Photologic® series photo detector with logic output. This component features a 935nm wavelength detection capability with push-pull output configuration and side-view packaging. The device is actively produced and maintains full compliance with ROHS3 and REACH standards. Substitute parts are identified when equivalent functional performance can be achieved through alternative manufacturers while maintaining critical electrical and mechanical parameters within acceptable tolerances for the application.

Substiute Parts

OPL551

TT Electronics/Optek TechnologyIn Stock: 1952OPL551 Datasheet

Current PartRFQ

QSE159

onsemiIn Stock: 1149QSE159 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPL551 is determined by the following critical parameters:

• Optical Detection Capability: Wavelength range compatibility (935nm primary specification)
• Logic Output Configuration: Output type classification (push-pull or open collector variants)
• Package Form Factor: Side-view optical sensor packaging
• Operating Temperature Range: -40°C to 85°C operational envelope
• Regulatory Compliance: ROHS3 and REACH status alignment
• Product Status: Active manufacturing status

The QSE159 manufactured by onsemi operates within the same optical sensor category and shares the side-view package configuration. While the QSE159 utilizes 880nm wavelength detection with open collector inverter output (differing from the OPL551's 935nm push-pull configuration), it maintains compatibility within the Photologic/OPTOLOGIC® sensor family framework and meets identical temperature and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the OPL551 and QSE159 maintain active product status with current manufacturing availability. Selection between these components is determined by specific application requirements regarding wavelength sensitivity and output signal configuration. The OPL551 provides 935nm detection with push-pull output topology, while the QSE159 delivers 880nm detection with open collector inverter output. Both devices satisfy identical operating temperature specifications (-40°C to 85°C) and regulatory compliance requirements (ROHS3 and REACH). Component selection should be based on the optical wavelength requirements of the target application and the compatibility of the output signal type with downstream circuit design.

Frequently Asked Questions (FAQ)

Q: Can QSE159 directly replace OPL551 in all applications?

A: Direct replacement depends on application-specific requirements. While both components share the same operating temperature range, regulatory compliance status, and optical sensor category, they differ in wavelength (935nm vs. 880nm) and output configuration (push-pull vs. open collector inverter). Wavelength compatibility with the optical source and output signal compatibility with receiving circuitry must be verified before substitution.

Q: What is the significance of the wavelength difference between OPL551 (935nm) and QSE159 (880nm)?

A: Wavelength determines the optical frequency to which the photo detector responds. The 935nm and 880nm specifications indicate different peak sensitivity ranges. Selection must align with the infrared light source wavelength used in the application to ensure adequate signal detection and system performance.

Q: How do the output types differ between these components?

A: The OPL551 features push-pull output, which provides both high and low drive capability from a single output stage. The QSE159 provides open collector inverter output, which requires external pull-up resistor configuration and inverts the logic signal. Circuit design must accommodate these output topology differences.

Q: Are both components suitable for industrial temperature environments?

A: Both the OPL551 and QSE159 operate across the -40°C to 85°C temperature range, making them suitable for industrial applications within this thermal envelope.

Q: Do both components meet current regulatory requirements?

A: Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component manufacturing and use.