OP599D Equivalent & Substitute Parts

Part Overview

The OP599D is a phototransistor optical sensor manufactured by TT Electronics/Optek Technology, designed for 890nm infrared detection applications. This component features a top-view T 1 3/4 package configuration and is rated for through-hole mounting. The OP599D is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support, design updates, and procurement continuity. Active alternatives with compatible electrical and mechanical specifications are available to maintain design functionality.

Key Parameters

Parameter	Value
Wavelength	890nm
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	50 mA
Current - Dark (Id) (Max)	100 nA
Power - Max	100 mW
Mounting Type	Through Hole
Orientation	Top View
Operating Temperature	-40°C ~ 100°C
Package / Case	T 1 3/4
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the OP599D is determined by alignment across the following critical parameters: wavelength (890nm), voltage rating (30 V maximum collector-emitter breakdown), maximum collector current (50 mA), dark current specification (100 nA maximum), power dissipation (100 mW), through-hole mounting configuration, top-view orientation, operating temperature range (-40°C to 100°C), and T 1 3/4 package form factor.

The OP599C represents a direct manufacturer equivalent from TT Electronics/Optek Technology, maintaining identical electrical specifications and package configuration while offering active product status. The QSD123 from onsemi provides functional substitution with compatible electrical ratings and through-hole mounting; however, it operates at 880nm wavelength (10nm variance from the primary specification) and features a radial 5mm diameter package geometry with a defined 24° viewing angle, introducing minor mechanical and spectral differences that must be evaluated for application-specific requirements.

Parameter Comparison

Parameter	OP599D (Main)	OP599C (Substitute)	QSD123 (Substitute)
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	onsemi
Wavelength	890nm	890nm	880nm
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V
Current - Collector (Ic) (Max)	50 mA	50 mA	Not Specified
Current - Dark (Id) (Max)	100 nA	100 nA	100 nA
Power - Max	100 mW	100 mW	100 mW
Mounting Type	Through Hole	Through Hole	Through Hole
Orientation	Top View	Top View	Top View
Operating Temperature	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C (TA)
Package / Case	T 1 3/4	T 1 3/4	Radial, 5mm Dia (T 1 3/4)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The OP599C is the primary substitute for the obsolete OP599D. Both components are manufactured by TT Electronics/Optek Technology and maintain identical electrical specifications, wavelength, and package configuration. The OP599C carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with equivalent moisture sensitivity and REACH compliance profiles.

The QSD123 from onsemi serves as a secondary substitute option. It maintains compatibility across voltage rating, dark current, power dissipation, operating temperature range, and through-hole mounting. The QSD123 is also ROHS3 compliant and active in production. The primary differences are the 880nm wavelength (versus 890nm) and the radial 5mm diameter package geometry. These differences require application-level evaluation to determine functional equivalence for specific infrared detection requirements.

Frequently Asked Questions (FAQ)

Q: Can the OP599C directly replace the OP599D without circuit modifications?

A: Yes. The OP599C maintains identical electrical specifications (30 V breakdown voltage, 50 mA maximum collector current, 100 nA dark current, 100 mW power rating) and package configuration (T 1 3/4 through-hole, top-view orientation). Both operate across -40°C to 100°C and are ROHS3 compliant. Direct substitution is supported.

Q: What are the key differences between the OP599C and QSD123?

A: The OP599C operates at 890nm wavelength with a standard T 1 3/4 package. The QSD123 operates at 880nm (10nm shorter wavelength) with a radial 5mm diameter package and includes a specified 24° viewing angle. Both maintain the same voltage, dark current, power, and temperature specifications. Package geometry and wavelength variance must be evaluated for application compatibility.

Q: Is the QSD123 suitable for applications requiring 890nm detection?

A: The QSD123 operates at 880nm, which represents a 10nm spectral shift from the 890nm specification. Suitability depends on the application's wavelength tolerance and filter characteristics. Applications with narrow spectral requirements or specific 890nm source coupling may require the OP599C for optimal performance.

Q: Are all three parts RoHS compliant?

A: Yes. The OP599D, OP599C, and QSD123 are all ROHS3 compliant. Both active substitutes (OP599C and QSD123) maintain equivalent environmental compliance profiles.

Q: What is the inventory status for these parts?

A: The OP599D (obsolete) has 793 pieces in stock. The OP599C (active) has 947 pieces available. The QSD123 (active) has 791 pieces in stock.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message