OPB844B Equivalent & Substitute Parts

Part Overview

The OPB844B is an optical sensor manufactured by TT Electronics / Optek Technology, classified as a through-beam phototransistor optical sensor with PCB mount configuration. This component is designed for slot-type optical sensing applications with a 0.125" (3.18mm) sensing distance and unamplified phototransistor output. The OPB844B is currently listed as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB844B
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 OPB844B 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 OPB844B while offering active product status from TT Electronics / Optek Technology.

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	REACH
OPB844B	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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected
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 Compliant	1 (Unlimited)	REACH Unaffected

Engineering Selection Recommendations

All listed substitute parts maintain full parametric equivalence to the OPB844B across electrical ratings, sensing characteristics, and environmental specifications. The primary distinction between the OPB844B and its substitutes is product status: the OPB844B is obsolete while all substitute parts are active in production.

All substitute parts carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). These certifications ensure compatibility with modern manufacturing and regulatory requirements.

Selection among the substitute parts should be based on packaging availability and inventory requirements, as all parts are electrically and mechanically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can OPB360L11, OPB360L51, OPB360L55, OPB360T51, OPB360T55, OPB365L51, OPB365T55, OPB370L55, OPB370T11, and OPB370T51 be used as direct replacements for OPB844B?

A: Yes. All listed parts are parametric equivalents with identical sensing distance (0.125" / 3.18mm), sensing method (through-beam), output configuration (phototransistor), current ratings (If 50 mA max, Ic 30 mA max), voltage rating (30 V max), operating temperature range (-40°C to 85°C), mounting type (through hole), and package type (PCB mount). All parts are unamplified and carry identical compliance certifications.

Q: What is the difference between the OPB360, OPB365, and OPB370 series?

A: Within the provided parameters, all three series maintain identical electrical and mechanical specifications. Differences are indicated by suffix designations (L11, L51, L55, T11, T51, T55) which represent packaging and configuration variants. The base series designation does not affect parametric equivalence for substitution purposes.

Q: Are there any compliance or regulatory differences between OPB844B and the substitute parts?

A: No. The OPB844B and all substitute parts are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) rating. Compliance certifications are identical across all parts.

Q: What should be considered when selecting among the available substitute parts?

A: Selection should be based on packaging availability, inventory levels, and lead time requirements. All parts are electrically and mechanically interchangeable. Packaging designation (Bulk) is consistent across all substitutes.

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