OP555C Equivalent & Substitute Parts

Part Overview

The OP555C is a 935nm side view radial phototransistor manufactured by TT Electronics/Optek Technology. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The OP555C operates within a collector-emitter breakdown voltage of 30V with a maximum collector current of 2.4mA and is designed for through-hole mounting applications requiring infrared photodetection in the 935nm wavelength range.

Substiute Parts

OP555C

TT Electronics/Optek TechnologyIn Stock: 701OP555C Datasheet

Current PartRFQ

OP555B

TT Electronics/Optek TechnologyIn Stock: 1401OP555B Datasheet

MFR RecommendedRFQ

QSE113

onsemiIn Stock: 30621QSE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the OP555C are qualified based on the following critical parameters:

• Wavelength compatibility (935nm primary requirement)
• Voltage rating (30V collector-emitter breakdown minimum)
• Dark current specification (100nA maximum)
• Mounting type (Through Hole)
• Package orientation (Side View Radial)
• Operating temperature range (-40°C ~ 100°C)
• RoHS3 compliance

The OP555B is a direct manufacturer-recommended substitute from the same product family, maintaining identical wavelength, voltage, dark current, viewing angle, power rating, mounting type, orientation, and temperature range specifications. The QSE113 operates at 880nm wavelength with comparable electrical and mechanical parameters, suitable for applications where the slightly shorter wavelength is acceptable within system design tolerances.

Parameter Comparison

Engineering Selection Recommendations

The OP555B is the primary substitute for the obsolete OP555C. Both components are manufactured by TT Electronics/Optek Technology, maintain identical electrical and mechanical specifications, and carry ROHS3 compliance. The OP555B is currently in active production with higher collector current capability (4.7mA versus 2.4mA), providing enhanced performance margin in existing circuit designs.

The QSE113 from onsemi is a secondary substitute option for applications where 880nm wavelength operation is compatible with system requirements. This component maintains equivalent voltage, dark current, power, mounting, and temperature specifications. The QSE113 offers significantly higher inventory availability and active product status.

Both substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original OP555C specification.

Frequently Asked Questions (FAQ)

Q: Can OP555B directly replace OP555C without circuit modification?

A: Yes. The OP555B maintains identical wavelength (935nm), voltage rating (30V), dark current (100nA), viewing angle (56°), power rating (100mW), mounting type (Through Hole), orientation (Side View), and operating temperature range (-40°C ~ 100°C). The higher collector current rating (4.7mA versus 2.4mA) is compatible with existing designs.

Q: What is the primary difference between OP555B and QSE113?

A: The OP555B operates at 935nm wavelength, while the QSE113 operates at 880nm. The QSE113 also has a slightly narrower viewing angle (50° versus 56°). Both maintain equivalent voltage, dark current, power, and temperature specifications. Wavelength selection depends on system photodetection requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The OP555B and QSE113 are both ROHS3 compliant, matching the original OP555C specification.

Q: What is the inventory status of substitute parts?

A: OP555B has 1,367 pieces in stock. QSE113 has 30,550 pieces in stock. Both are actively manufactured.

Q: Does the radial package orientation differ between substitutes?

A: No. All three components (OP555C, OP555B, QSE113) use Through Hole mounting with Side View radial orientation, ensuring mechanical compatibility in existing PCB designs.