OPL550-OC Equivalent & Substitute Parts

Part Overview

The OPL550-OC is a Photologic® optical sensor manufactured by TT Electronics/Optek Technology, designed as a 935nm photo detector with logic output and open collector configuration in a side view package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPL550-OC
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Series	Photologic®
Wavelength	935nm
Type	Photo Detector, Logic Output
Output Type	Open Collector
Package / Case	Side View
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the OPL550-OC is determined by the following critical parameters: wavelength (935nm), sensor type (photo detector with logic output), output configuration (open collector), package form factor (side view), and operating temperature range (-40°C ~ 85°C). Substitute parts must maintain compatibility across these core electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Functional Equivalents: Parts that maintain identical wavelength, output type, and package configuration with active product status.

Cross-Manufacturer Alternatives: Parts from different manufacturers that provide equivalent functionality with minor variations in output logic inversion or wavelength specification.

Parameter Comparison

Parameter	OPL550-OC	OPL550-OCA	OPL551-OC	QSE159
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	onsemi
Wavelength	935nm	935nm	935nm	880nm
Type	Photo Detector, Logic Output	Photo Detector, Logic Output	Photo Detector, Logic Output	Photo Detector, Logic Output
Output Type	Open Collector	Open Collector	Open Collector Inverter	Open Collector Inverter
Package / Case	Side View	Side View	Side View	3-SIP, Side View
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

OPL550-OCA is the primary direct substitute for OPL550-OC. Both components share identical wavelength (935nm), output type (open collector), package configuration (side view), and operating temperature range. OPL550-OCA maintains active product status and full ROHS3 compliance, making it the preferred choice for direct replacement in existing designs.

OPL551-OC provides functional substitution with the same wavelength and package form factor. The key difference is the output configuration: OPL551-OC features open collector inverter logic compared to the standard open collector output of OPL550-OC. This part is active and fully compliant. Selection requires verification that inverted logic output is compatible with the application circuit.

QSE159 from onsemi offers cross-manufacturer substitution with equivalent sensor type and open collector inverter output. The wavelength specification differs at 880nm compared to 935nm, and the package is specified as 3-SIP side view. QSE159 is active and ROHS3 compliant. This option is suitable when wavelength tolerance permits and cross-manufacturer sourcing is acceptable.

All substitute parts maintain the required operating temperature range (-40°C ~ 85°C) and regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification).

Frequently Asked Questions (FAQ)

Q: Can OPL550-OCA be used as a direct replacement for OPL550-OC?

A: Yes. OPL550-OCA is a direct functional equivalent with identical wavelength (935nm), output type (open collector), package configuration (side view), and operating temperature range. The primary advantage is active product status compared to the obsolete OPL550-OC.

Q: What is the difference between OPL550-OC and OPL551-OC?

A: Both parts share the same wavelength (935nm), package form factor (side view), and operating temperature range. The functional difference is in output logic: OPL550-OC provides standard open collector output, while OPL551-OC provides open collector inverter output. Circuit compatibility must be verified before substitution.

Q: Is QSE159 compatible with OPL550-OC applications?

A: QSE159 provides functional substitution with equivalent sensor type and open collector inverter output. The wavelength differs at 880nm versus 935nm, and the package is 3-SIP side view. Compatibility depends on application wavelength tolerance and circuit acceptance of inverted logic output.

Q: What packaging differences exist among these optical sensors?

A: OPL550-OC, OPL550-OCA, and OPL551-OC all use side view package configuration. QSE159 specifies 3-SIP side view packaging, which may require mechanical and electrical interface verification for board-level integration.

Q: Are all substitute parts RoHS compliant?

A: Yes. OPL550-OCA, OPL551-OC, and QSE159 are all ROHS3 compliant and REACH unaffected, matching the regulatory status of the original OPL550-OC component.

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