OPB835L51 Equivalent & Substitute Parts

Part Overview

The OPB835L51 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 currently listed as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB835L51
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 OPB835L51 are identified based on strict electrical and mechanical parameter matching. The critical parameters that determine substitution eligibility are:

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 specifications and environmental ratings. The primary distinction between substitute options is product status (active vs. obsolete) and packaging configuration (bulk vs. other formats).

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 / Case	Type	RoHS Status	MSL	REACH Status
OPB835L51	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
OPB835L11	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
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

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and environmental parameter equivalence with the OPB835L51. The primary selection criterion is product status: all substitute parts listed are in active production status, whereas the OPB835L51 is obsolete.

OPB835L11 is the manufacturer-recommended direct substitute, sharing the identical base product number (OPB835) with the obsolete part. This part is currently in active status with 822 units in stock.

For applications requiring alternative base product numbers within the OPB360, OPB365, and OPB370 series, all listed variants maintain identical electrical specifications, operating temperature range, and compliance certifications (ROHS3 Compliant, REACH Unaffected). Selection among these alternatives should be based on packaging availability and inventory requirements, as all meet the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can OPB835L11 be used as a direct replacement for OPB835L51?

A: Yes. OPB835L11 is the manufacturer-recommended substitute and maintains identical electrical specifications, sensing distance, output configuration, and environmental ratings. The primary difference is product status: OPB835L11 is active while OPB835L51 is obsolete.

Q: What distinguishes the OPB360, OPB365, and OPB370 series from the OPB835 series?

A: All parts within these series maintain identical electrical parameters, sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), current ratings, voltage ratings, and operating temperature range (-40°C ~ 85°C). The series designation reflects internal product line organization by TT Electronics/Optek Technology. All are functionally equivalent for applications requiring these specifications.

Q: Are there packaging differences between substitute options?

A: All substitute parts listed are supplied in bulk packaging. The OPB835L51 original part does not specify packaging format in the provided data. Packaging configuration should be confirmed with the supplier for specific procurement requirements.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the OPB835L51. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts.

Q: Which substitute part has the highest current inventory?

A: OPB365T55 has the highest inventory at 4496 units in stock, followed by OPB360T51 with 2007 units. OPB835L11 (the direct manufacturer-recommended substitute) has 822 units available.

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