OPB859 Equivalent & Substitute Parts

Part Overview

The OPB859 is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a through-beam phototransistor optical sensor with PCB mount packaging. This component is designed for slot-based optical sensing applications requiring a 0.125" (3.18mm) sensing distance. The part maintains Active product status with 623 units in current inventory stock.

Equivalent and substitute parts are necessary when the OPB859 becomes unavailable, when supply chain constraints require alternative sourcing, or when design flexibility permits selection from compatible alternatives within the same electrical and mechanical parameter range.

Key Parameters

Parameter	Value
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 Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	PCB Mount
Type	Unamplified
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the OPB859 are qualified based on strict electrical and mechanical parameter equivalence. All substitute parts listed maintain identical specifications across the following critical parameters:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-beam
Output configuration: Phototransistor
Maximum DC forward current: 50 mA
Maximum collector current: 30 mA
Maximum collector-emitter breakdown voltage: 30 V
Operating temperature range: -40°C ~ 85°C
Mounting type: Through hole
Package type: PCB mount
Component type: Unamplified

All substitute parts are manufactured by TT Electronics/Optek Technology and maintain identical compliance certifications (ROHS3, REACH Unaffected, EAR99, HTSUS 8541.49.8000). Substitution is valid when these parameters remain constant across the application circuit design.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package	Type	RoHS Status	Inventory
OPB859	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	623 Pcs
OPB360T51	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	2007 Pcs
OPB365T55	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	4496 Pcs
OPB370L55	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	909 Pcs
OPB370T51	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	909 Pcs
OPB370T55	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1112 Pcs
OPB380T11Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1111 Pcs
OPB380T51Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	2503 Pcs
OPB380T55Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1036 Pcs
OPB390L11Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1137 Pcs
OPB390L51Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	1025 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and full compliance with ROHS3, REACH Unaffected, EAR99, and HTSUS 8541.49.8000 classifications. Selection among equivalent parts is based on inventory availability and supply chain considerations.

OPB365T55 offers the highest current inventory level at 4496 units, followed by OPB380T51Z at 2503 units and OPB360T51 at 2007 units. These parts are suitable for immediate procurement when OPB859 availability is constrained.

OPB370T55, OPB380T55Z, OPB390L11Z, and OPB390L51Z maintain moderate inventory levels between 1000 and 1200 units. OPB370L55 and OPB370T51 each maintain 909 units in stock.

All substitute parts are manufactured by the same original equipment manufacturer and carry identical electrical ratings, operating temperature specifications, and regulatory compliance certifications as the OPB859.

Frequently Asked Questions (FAQ)

Q: Can OPB360T51, OPB365T55, and OPB370 series parts be used interchangeably with OPB859?

A: Yes. All listed substitute parts maintain identical electrical parameters (50 mA maximum DC forward current, 30 mA maximum collector current, 30 V maximum collector-emitter breakdown voltage), identical sensing distance (0.125" / 3.18mm), identical sensing method (through-beam), and identical mounting configuration (through-hole PCB mount). Substitution is valid when these parameters satisfy circuit design requirements.

Q: What is the difference between OPB380T11Z, OPB380T51Z, and OPB380T55Z?

A: These three part numbers share the same base product designation (OPB380) and maintain identical electrical and mechanical specifications. The suffix designations (T11Z, T51Z, T55Z) represent internal manufacturing or packaging variants that do not affect electrical performance or physical compatibility. All three are equivalent substitutes for OPB859.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant certification and REACH Unaffected status, matching the compliance profile of the OPB859.

Q: Which substitute part has the best availability?

A: OPB365T55 maintains the highest inventory level at 4496 units in current stock, followed by OPB380T51Z at 2503 units.

Q: Can I use OPB390L11Z or OPB390L51Z as direct replacements?

A: Yes. OPB390L11Z and OPB390L51Z maintain all electrical and mechanical parameters identical to OPB859, including sensing distance, current ratings, voltage ratings, operating temperature range, and mounting type. Both are valid direct substitutes.

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