OP555D Equivalent & Substitute Parts

Part Overview

The OP555D is a phototransistor optical sensor manufactured by TT Electronics/Optek Technology, designed for 935nm side view radial applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The OP555D operates as a light-sensitive transistor suitable for infrared detection applications requiring side view orientation and radial through-hole mounting.

Substiute Parts

OP555D

TT Electronics/Optek TechnologyIn Stock: 980OP555D Datasheet

Current PartRFQ

QSE113

onsemiIn Stock: 30621QSE113 Datasheet

MFR RecommendedRFQ

QSE113

onsemiIn Stock: 30621QSE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OP555D is determined by the following critical parameters:

• Wavelength sensitivity (935nm primary detection range)
• Voltage rating (30 V Collector Emitter Breakdown maximum)
• Dark current specification (100 nA maximum)
• Power dissipation capability (100 mW maximum)
• Mounting configuration (Through Hole, Radial package, Side View orientation)
• Operating temperature range (-40°C ~ 100°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The QSE113 from onsemi operates at 880nm wavelength, which represents a near-infrared detection range adjacent to the OP555D's 935nm specification. Both components share identical voltage ratings, dark current specifications, power ratings, mounting types, and operating temperature ranges. The primary technical difference is the wavelength sensitivity, with QSE113 operating at a shorter wavelength suitable for applications where 880nm detection is acceptable within the system design parameters.

Parameter Comparison

Engineering Selection Recommendations

The QSE113 is an active product from onsemi with full ROHS3 compliance and REACH unaffected status, providing long-term availability and regulatory compliance assurance. The OP555D's obsolete status necessitates transition to an alternative component for new designs and ongoing production support.

Both components maintain identical electrical ratings for voltage breakdown, dark current, and power dissipation. The QSE113 operates at 880nm wavelength compared to the OP555D's 935nm, representing a 55nm shift in the near-infrared spectrum. The viewing angle differs by 6° (QSE113 at 50° versus OP555D at 56°), which may impact optical system design depending on application requirements.

Selection of QSE113 as a substitute is appropriate for applications where 880nm detection sensitivity is functionally equivalent to 935nm detection within the system's optical and electronic design parameters. Compliance certifications remain consistent between both components.

Frequently Asked Questions (FAQ)

Q: Can QSE113 directly replace OP555D in existing designs?

A: QSE113 shares identical electrical specifications (voltage, current, power) and mounting configuration with OP555D. The primary consideration is wavelength compatibility. If the original design operates at 935nm detection, QSE113's 880nm sensitivity must be evaluated within the application's optical requirements and light source characteristics.

Q: What is the significance of the wavelength difference between 935nm and 880nm?

A: Wavelength determines the phototransistor's spectral sensitivity. The 55nm difference places both components in the near-infrared region but with different peak response characteristics. Application compatibility depends on the light source wavelength and the system's tolerance for spectral shift.

Q: Are there compliance differences between OP555D and QSE113?

A: Both components are ROHS3 compliant and REACH unaffected. QSE113's active product status ensures ongoing compliance maintenance and regulatory support, whereas OP555D's obsolete status limits future compliance updates.

Q: How does the viewing angle difference affect substitution?

A: OP555D provides 56° viewing angle while QSE113 provides 50°. This 6° difference may impact optical system design, particularly in applications requiring wide-angle light detection. System optical geometry should be evaluated to confirm compatibility.

Q: What is the inventory status for these components?

A: OP555D has 874 pieces in stock as new original inventory. QSE113 has 30,550 pieces in stock, providing significantly greater availability for procurement and production planning.