OPB840L55 Equivalent & Substitute Parts

Part Overview

The OPB840L55 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 requiring 0.125" (3.18mm) sensing distance. The part maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when applications require alternative sourcing due to inventory constraints, supply chain considerations, or design flexibility within the same electrical and mechanical parameter envelope.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB840L55
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

Substitute Part Grouping Explanation

Substitute parts for the OPB840L55 are qualified based on strict electrical and mechanical parameter equivalence. All identified substitute parts 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

Substitution is valid when all listed parameters match exactly. Variations in base product number (e.g., OPB360, OPB365, OPB370, OPB380, OPB390) do not affect functional equivalence within this parameter set.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package / Case	Type	RoHS Status	MSL	Inventory (Pcs)
OPB840L55	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	1 (Unlimited)	993
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	1 (Unlimited)	2007
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	1 (Unlimited)	4496
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	1 (Unlimited)	909
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	1 (Unlimited)	909
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	1 (Unlimited)	1112
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	1 (Unlimited)	1111
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	1 (Unlimited)	2503
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	1 (Unlimited)	1036
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	1 (Unlimited)	1137
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	1 (Unlimited)	1025

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full ROHS3 compliance with REACH Unaffected designation. Selection among equivalent parts should be based on inventory availability and supply chain lead times. OPB365T55 offers the highest current inventory level at 4496 units, followed by OPB380T51Z at 2503 units. OPB360T51 provides 2007 units in stock. All parts are manufactured by TT Electronics/Optek Technology and carry identical electrical performance specifications, mechanical mounting characteristics, and regulatory compliance certifications. PCB layout and through-hole mounting footprints are functionally equivalent across all listed part numbers.

Frequently Asked Questions (FAQ)

Q: Can OPB365T55 be used as a direct replacement for OPB840L55?

A: Yes. OPB365T55 meets all electrical and mechanical parameter requirements for direct substitution. Both parts share identical sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), current ratings (If 50 mA max, Ic 30 mA max), voltage breakdown (30 V), operating temperature range (-40°C to 85°C), mounting type (through hole), and package configuration (PCB mount). Regulatory compliance and moisture sensitivity levels are identical.

Q: Are there any differences in PCB mounting between OPB840L55 and the substitute parts?

A: No. All listed substitute parts use identical through-hole PCB mount configuration. Physical footprints and mounting hole spacing are equivalent across all part numbers, allowing direct board-level substitution without layout modifications.

Q: What is the difference between parts ending in "T55" versus "T51" or "L55"?

A: The suffix designations (T55, T51, L55, L11, L51) represent internal TT Electronics/Optek Technology product variants. Within this substitution list, all variants maintain identical electrical performance parameters, sensing characteristics, and mechanical specifications. Suffix differences do not affect functional equivalence for through-beam phototransistor optical sensing applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification with REACH Unaffected status, matching the compliance profile of OPB840L55. Moisture sensitivity level is MSL 1 (Unlimited) across all parts.

Q: Which substitute part has the best inventory availability?

A: OPB365T55 maintains the highest inventory level at 4496 units in stock, followed by OPB380T51Z at 2503 units and OPB360T51 at 2007 units. All parts are classified as New Original stock.

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