OPB844A Equivalent & Substitute Parts

Part Overview

The OPB844A is an optical sensor manufactured by TT Electronics/Optek Technology, designed as a through-beam phototransistor with PCB mount configuration. This component operates with a 0.125" (3.18mm) sensing distance and is classified as an unamplified optical sensor. The OPB844A is currently listed as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB844A
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	Phototransistor
Current - DC Forward (If) (Max)	50 mA
Current - Collector (Ic) (Max)	30 mA
Voltage - Collector Emitter Breakdown (Max)	30 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	PCB Mount
Type	Unamplified
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the OPB844A are identified based on strict parametric equivalence across the following critical parameters:

Sensing Distance: 0.125" (3.18mm)
Sensing Method: Through-Beam
Output Configuration: Phototransistor
Current - DC Forward (If) (Max): 50 mA
Current - Collector (Ic) (Max): 30 mA
Voltage - Collector Emitter Breakdown (Max): 30 V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: PCB Mount
Type: Unamplified
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

All substitute parts listed maintain identical electrical and mechanical specifications to the OPB844A. The primary distinction among substitutes is product status, with all listed alternatives currently in active production status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package	Type	RoHS	MSL	Inventory
OPB844A	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	696 Pcs
OPB360L11	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	742 Pcs
OPB360L51	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	688 Pcs
OPB360L55	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	1118 Pcs
OPB360T51	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	2007 Pcs
OPB360T55	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	769 Pcs
OPB365L51	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	1132 Pcs
OPB365T55	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	4496 Pcs
OPB370L55	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	909 Pcs
OPB370T11	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	909 Pcs
OPB370T51	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3	1	909 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain full parametric equivalence to the OPB844A across electrical, mechanical, and environmental specifications. The primary advantage of substitution is product status: all alternatives are in active production, ensuring sustained availability and supply chain reliability.

All substitute parts carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). These certifications align with the OPB844A, supporting seamless integration into existing designs without regulatory or environmental concerns.

Selection among substitute options should be based on inventory availability and packaging preferences. OPB360T51 and OPB365T55 offer the highest inventory levels at 2007 Pcs and 4496 Pcs respectively, providing optimal procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can OPB360 series parts directly replace the OPB844A? A: Yes. OPB360L11, OPB360L51, OPB360L55, OPB360T51, and OPB360T55 are parametric equivalents with identical electrical ratings, sensing distance, output configuration, and operating temperature range. All maintain the same through-hole PCB mount configuration.

Q: Can OPB365 and OPB370 series parts replace the OPB844A? A: Yes. OPB365L51, OPB365T55, OPB370L55, OPB370T11, and OPB370T51 are parametric equivalents meeting all electrical and mechanical specifications of the OPB844A.

Q: What is the difference between substitute part numbers with different suffixes (L11, L51, L55, T11, T51, T55)? A: The provided data does not specify technical differences associated with these suffixes. Suffix variations may indicate packaging, lead configuration, or internal optical characteristics. Consult manufacturer datasheets for suffix-specific details.

Q: Are all substitute parts currently available? A: Yes. All listed substitute parts carry active product status with confirmed inventory levels ranging from 688 Pcs to 4496 Pcs.

Q: Do substitute parts maintain the same compliance certifications? A: Yes. All substitute parts are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) rating, matching the OPB844A certifications.

Q: Can I use these substitutes in new designs? A: Yes. All substitute parts are in active production status, making them suitable for new design implementations with assured long-term supply continuity.

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