OP550D Equivalent & Substitute Parts

Part Overview

The OP550D is a 935nm side view radial phototransistor manufactured by TT Electronics/Optek Technology, designed for infrared sensing applications. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and production continuity. The OP550D operates within a -40°C to 100°C temperature range with a maximum collector-emitter breakdown voltage of 30V and maximum collector current of 2.4mA.

Key Parameters

Parameter	Value
Manufacturer Part Number	OP550D
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Description	Phototransistors 935nm Side View Radial
Wavelength	935nm
Voltage - Collector Emitter Breakdown (Max)	30V
Current - Collector (Ic) (Max)	2.4mA
Current - Dark (Id) (Max)	100nA
Power - Max	100mW
Mounting Type	Through Hole
Orientation	Side View
Operating Temperature	-40°C ~ 100°C
Package / Case	Radial
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the OP550D are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Mounting Type: Through Hole
Orientation: Side View
Package / Case: Radial
Operating Temperature Range: -40°C ~ 100°C
Voltage - Collector Emitter Breakdown (Max): 30V
Current - Dark (Id) (Max): 100nA
Power - Max: 100mW
RoHS Status: ROHS3 Compliant

Wavelength Consideration: The OP550D operates at 935nm. Substitute parts are grouped into two categories: direct wavelength equivalents (935nm) and near-infrared alternatives (880nm) that share identical electrical and mechanical specifications.

Identified Substitutes:

OP550C (TT Electronics/Optek Technology) - Direct equivalent with identical wavelength (935nm), electrical ratings, and mechanical specifications. Product status is Active.
QSE113 (onsemi) - Alternative phototransistor with 880nm wavelength, matching all electrical ratings, mechanical specifications, and compliance requirements. Product status is Active.

Parameter Comparison

Parameter	OP550D	OP550C	QSE113
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	onsemi
Wavelength	935nm	935nm	880nm
Voltage - Collector Emitter Breakdown (Max)	30V	30V	30V
Current - Collector (Ic) (Max)	2.4mA	2.4mA	Not Specified
Current - Dark (Id) (Max)	100nA	100nA	100nA
Power - Max	100mW	100mW	100mW
Mounting Type	Through Hole	Through Hole	Through Hole
Orientation	Side View	Side View	Side View
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	Radial	Radial	Radial, Side View
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not Applicable

Engineering Selection Recommendations

OP550C is the primary substitute for OP550D applications. Both components are manufactured by TT Electronics/Optek Technology, share identical electrical specifications, mechanical configuration, and wavelength (935nm). OP550C maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory alignment.

QSE113 serves as an alternative substitute for applications where 880nm wavelength operation is acceptable within system design parameters. Manufactured by onsemi, QSE113 matches all critical electrical ratings and mechanical specifications of OP550D while offering higher inventory availability (30,550 units in stock versus 3,688 for OP550C). QSE113 maintains Active product status and ROHS3 compliance.

Selection between OP550C and QSE113 depends on wavelength requirements specific to the application's infrared sensing design.

Frequently Asked Questions (FAQ)

Q: Can OP550C directly replace OP550D without circuit modification?

A: Yes. OP550C shares identical electrical specifications (30V breakdown voltage, 2.4mA maximum collector current, 100nA dark current, 100mW maximum power), mechanical configuration (through hole, side view, radial package), and operating temperature range (-40°C to 100°C) with OP550D.

Q: What is the primary difference between OP550C and QSE113?

A: The primary difference is wavelength. OP550C operates at 935nm (matching OP550D), while QSE113 operates at 880nm. Both share identical electrical ratings and mechanical specifications. QSE113 also includes a specified viewing angle of 50°, whereas OP550D and OP550C do not specify this parameter.

Q: Are both substitutes RoHS compliant?

A: Yes. Both OP550C and QSE113 are ROHS3 compliant, matching the compliance status of OP550D.

Q: Which substitute offers better availability?

A: QSE113 offers significantly higher inventory availability with 30,550 units in stock compared to OP550C with 3,688 units in stock.

Q: Does wavelength difference affect mechanical compatibility?

A: No. Both OP550C (935nm) and QSE113 (880nm) use identical through-hole, side-view, radial packaging. Mechanical compatibility is maintained regardless of wavelength selection.

Q: What is the moisture sensitivity rating for QSE113?

A: QSE113 has a moisture sensitivity level listed as Not Applicable, whereas OP550D and OP550C both specify MSL 1 (Unlimited).

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