OPB820 Equivalent & Substitute Parts

Part Overview

The OPB820 is an optical sensor with through-beam sensing configuration and phototransistor output, designed for PCB mount applications with a 0.080" (2.03mm) sensing distance. The OPB820 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical electrical and mechanical specifications are available from the same manufacturer.

Key Parameters

Parameter	Value
Sensing Distance	0.080" (2.03mm)
Sensing Method	Through-Beam
Output Configuration	Phototransistor
Current - DC Forward (If) (Max)	50 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 OPB820 are determined by equivalence across all critical electrical and mechanical parameters. The substitution logic is based on matching the following criteria:

Sensing distance: 0.080" (2.03mm)
Sensing method: Through-Beam
Output configuration: Phototransistor
Maximum DC forward current: 50 mA
Maximum collector-emitter breakdown voltage: 30 V
Operating temperature range: -40°C ~ 85°C
Mounting type: Through Hole
Package type: PCB Mount
Sensor type: Unamplified

All substitute parts listed below meet these parameters identically and are manufactured by TT Electronics/Optek Technology. The primary distinction between parts is product status and packaging configuration.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	If (Max)	VCE (Max)	Operating Temperature	Mounting Type	Package / Case	Type	RoHS Status	Inventory
OPB820	TT Electronics/Optek Technology	Obsolete	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	991 Pcs
OPB820S10	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	6412 Pcs
OPB820S3	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	787 Pcs
OPB820S5	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Through Hole	PCB Mount	Unamplified	ROHS3 Compliant	2157 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete OPB820, direct substitution with OPB820S10, OPB820S3, or OPB820S5 is supported. All substitute parts maintain identical electrical and mechanical specifications, ensuring functional compatibility without circuit redesign.

OPB820S10 is designated as the manufacturer-recommended substitute and carries the highest inventory availability (6412 units), making it the primary choice for new production and design transitions.

OPB820S3 and OPB820S5 are parametric equivalents with active product status and full ROHS3 compliance. Selection between these alternatives may be based on packaging requirements, lead time, or inventory considerations specific to procurement channels.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental and safety standards.

Frequently Asked Questions (FAQ)

Q: Can OPB820S10, OPB820S3, and OPB820S5 be used interchangeably with OPB820?

A: Yes. All substitute parts share identical electrical parameters (50 mA maximum DC forward current, 30 V maximum collector-emitter breakdown voltage), mechanical specifications (0.080" sensing distance, through-beam configuration, phototransistor output), and operating temperature range (-40°C ~ 85°C). Direct substitution is supported without circuit modification.

Q: What is the difference between OPB820S10, OPB820S3, and OPB820S5?

A: These parts are parametric equivalents with identical electrical and mechanical specifications. The suffix designations (S10, S3, S5) indicate packaging or distribution variants. All three are active products manufactured by TT Electronics/Optek Technology with full ROHS3 compliance.

Q: Why is OPB820 listed as obsolete?

A: The OPB820 has been superseded by active equivalent models. Manufacturers typically transition legacy part numbers to newer designations while maintaining functional compatibility. The substitute parts listed provide equivalent performance with ongoing manufacturer support and availability.

Q: Are all substitute parts PCB mount through-hole components?

A: Yes. OPB820S10, OPB820S3, and OPB820S5 are all through-hole PCB mount optical sensors with identical package specifications to the original OPB820.

Q: Do the substitute parts meet current compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

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