OPB866T55 Equivalent & Substitute Parts

Part Overview

The OPB866T55 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-type optical sensing applications requiring 0.125" (3.18mm) sensing distance. The part is currently active in production status with 1104 units in stock inventory. Substitute parts are necessary when the primary part becomes unavailable, when inventory constraints require alternative sourcing, or when design flexibility permits selection from equivalent optical sensor variants within the same electrical and mechanical parameter range.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB866T55
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	Active

Substitute Part Grouping Explanation

Substitute parts for the OPB866T55 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
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 are manufactured by TT Electronics/Optek Technology and share the same functional category as optical sensors. Substitution is valid when these parameters remain constant across the component selection.

Parameter Comparison

Part Number	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package	Type	Inventory (Pcs)
OPB866T55	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1104
OPB360T51	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	2007
OPB365T55	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	4496
OPB370L55	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	909
OPB370T51	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	909
OPB370T55	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1112
OPB380T11Z	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1111
OPB380T51Z	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	2503
OPB380T55Z	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1036
OPB390L11Z	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1137
OPB390L51Z	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	1025

Engineering Selection Recommendations

All listed substitute parts maintain active product status with TT Electronics/Optek Technology. Each part carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection among equivalent parts should be based on inventory availability and lead time considerations. OPB365T55 offers the highest inventory level at 4496 units, while OPB380T51Z provides 2503 units. All parts are qualified for identical electrical and mechanical applications where the OPB866T55 is specified.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the OPB866T55?

A: Substitution is valid when all electrical parameters (forward current, collector current, breakdown voltage), sensing distance, sensing method, output configuration, operating temperature range, mounting type, and package type remain identical. All listed parts meet these criteria.

Q: Are there differences in the part numbers that affect compatibility?

A: Part number variations within the OPB series reflect different internal configurations or manufacturing dates, but do not affect electrical or mechanical compatibility when all specified parameters are identical. The suffix designations (T55, T51, L55, etc.) indicate specific internal variants that remain functionally equivalent for the parameters listed.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes. All substitute parts share identical mounting type (Through Hole), package type (PCB Mount), and electrical specifications. PCB layout and footprint compatibility is maintained across all listed parts.

Q: What is the difference between parts with "Z" suffix and those without?

A: The "Z" suffix designation does not affect the electrical or mechanical parameters provided in this reference. All parts with and without the "Z" suffix maintain identical specifications for sensing distance, current ratings, voltage ratings, operating temperature, and mounting configuration.

Q: Which substitute part should I select if multiple options are available?

A: Selection should be based on inventory availability, lead time, and procurement cost. OPB365T55 and OPB380T51Z offer the highest inventory levels. All parts are functionally equivalent for applications requiring the OPB866T55 specifications.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory compliance of the OPB866T55.

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