OP555B Phototransistor 935nm Side View Radial Equivalent & Substitute Parts

Part Overview

The OP555B is an active phototransistor optical sensor manufactured by TT Electronics/Optek Technology, designed for 935nm wavelength detection in side view radial configuration. This component is a through-hole mounted photodetector suitable for infrared sensing applications requiring side-view orientation. The part is ROHS3 compliant and currently in active production status with 1367 units in stock. Substitute parts may be required due to supply constraints, design revisions, or application-specific wavelength requirements.

Substiute Parts

OP555B

TT Electronics/Optek TechnologyIn Stock: 1401OP555B Datasheet

Current PartRFQ

QSE114

onsemiIn Stock: 5054QSE114 Datasheet

MFR RecommendedRFQ

QSE114

onsemiIn Stock: 5054QSE114 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OP555B is determined by the following critical parameters: mounting type (through hole), orientation (side view), package configuration (radial), voltage rating (30 V minimum), power dissipation (100 mW), operating temperature range (-40°C to 100°C), and compliance certifications (ROHS3, REACH Unaffected, EAR99). The QSE114 phototransistor from onsemi meets all mechanical and electrical substitution criteria. While the QSE114 operates at 880nm wavelength compared to the OP555B's 935nm, both components share identical voltage ratings, power ratings, temperature ranges, mounting configurations, and compliance status. The wavelength difference reflects a shift within the near-infrared spectrum and does not preclude substitution in applications where the 880nm detection band is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the OP555B and QSE114 maintain active production status and full ROHS3 compliance. The QSE114 is qualified as a direct substitute based on matching electrical specifications (30 V breakdown voltage, 100 nA dark current, 100 mW power rating), identical operating temperature range, and compatible through-hole radial packaging. The primary design consideration is wavelength selection: the OP555B operates at 935nm while the QSE114 operates at 880nm. This wavelength difference must be evaluated against the specific infrared source and detector sensitivity requirements of the application. The QSE114 exhibits a slightly narrower viewing angle (50° versus 56°), which may impact field-of-view characteristics in directional sensing applications.

Frequently Asked Questions (FAQ)

Q: Can the QSE114 be used as a direct replacement for the OP555B in all applications?

A: The QSE114 is mechanically and electrically compatible with the OP555B. However, the wavelength difference (880nm versus 935nm) requires verification that the application's infrared source and optical filtering are compatible with the 880nm detection band. The slightly reduced viewing angle (50° versus 56°) should be confirmed against directional sensing requirements.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution is based on matching mounting type (through hole), orientation (side view), package configuration (radial), voltage rating (30 V), power dissipation (100 mW), operating temperature range (-40°C to 100°C), and compliance certifications (ROHS3, REACH Unaffected). Wavelength and viewing angle are application-dependent parameters that must be evaluated separately.

Q: Are there inventory or lead time advantages to using the QSE114?

A: The QSE114 has 4945 units in stock compared to 1367 units for the OP555B, indicating greater availability. Both parts are in active production with equivalent compliance status.

Q: How do the dark current specifications compare?

A: Both the OP555B and QSE114 specify a maximum dark current of 100 nA, indicating equivalent performance in low-light detection scenarios.

Q: What is the impact of the viewing angle difference?

A: The OP555B has a 56° viewing angle while the QSE114 has a 50° viewing angle. This 6° difference may affect the field of view in applications requiring wide-angle infrared detection. Applications with narrow-angle or collimated optical paths will not be significantly impacted.