OPB821 Equivalent & Substitute Parts

Part Overview

The OPB821 is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This component features a 0.080" (2.03mm) sensing distance and is designed for slot-based optical detection applications. The OPB821 is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved availability.

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
Type	Unamplified
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OPB821 is determined by strict equivalence across the following critical parameters:

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
Type: Unamplified
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain these parameters identically. Variations exist only in mounting type (chassis mount versus through hole) and packaging configuration (pre-wired versus slotted), which are mechanical and packaging considerations rather than functional electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	If (Max)	VCE Breakdown (Max)	Operating Temperature	Type	Mounting Type	Package / Case	RoHS Status	Inventory
OPB821	TT Electronics/Optek Technology	Obsolete	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Chassis Mount	Module, Pre-Wired	ROHS3 Compliant	747 Pcs
OPB821Z	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Through Hole	Module, Slotted	ROHS3 Compliant	5291 Pcs
OPB821TX	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Chassis Mount	Module, Pre-Wired	ROHS3 Compliant	902 Pcs
OPB821S3Z	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Chassis Mount	Module, Pre-Wired	ROHS3 Compliant	2212 Pcs
OPB821S5Z	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Chassis Mount	Module, Pre-Wired	ROHS3 Compliant	7450 Pcs
OPB821S10Z	TT Electronics/Optek Technology	Active	0.080" (2.03mm)	Through-Beam	Phototransistor	50 mA	30 V	-40°C ~ 85°C	Unamplified	Chassis Mount	Module, Pre-Wired	ROHS3 Compliant	1850 Pcs

Engineering Selection Recommendations

All substitute parts are manufactured by TT Electronics/Optek Technology and maintain ROHS3 compliance and REACH unaffected status. Selection between substitute options depends on mounting and packaging requirements:

For chassis mount applications with pre-wired configuration, OPB821TX, OPB821S3Z, OPB821S5Z, and OPB821S10Z are functionally equivalent to the original OPB821. These parts are all active products with established supply availability.

For through-hole mounting applications, OPB821Z provides a slotted module configuration while maintaining all electrical specifications. This variant is suitable for PCB-based integration where through-hole mounting is required.

All substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard handling and storage procedures.

Frequently Asked Questions (FAQ)

Q: Can OPB821Z be used as a direct replacement for OPB821?

A: OPB821Z is electrically equivalent but differs in mounting type. OPB821 uses chassis mount with pre-wired configuration, while OPB821Z uses through-hole mounting with slotted configuration. Selection depends on the mechanical integration requirements of your application.

Q: What is the difference between OPB821TX, OPB821S3Z, OPB821S5Z, and OPB821S10Z?

A: These parts are electrically and mechanically identical. All feature chassis mount, pre-wired configuration, and identical electrical parameters. Differences exist only in part numbering and packaging variants. Selection can be based on availability and supply chain considerations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the compliance profile of the original OPB821.

Q: What is the sensing distance specification for these optical sensors?

A: All parts in this family, including OPB821 and its substitutes, feature a 0.080" (2.03mm) through-beam sensing distance. This specification is fixed across all variants and cannot be altered through part selection.

Q: Can these phototransistor modules be used in high-temperature applications?

A: Yes. All parts maintain an operating temperature range of -40°C to 85°C, supporting both industrial and extended temperature environments within this specification.

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