OPB891L51 Equivalent & Substitute Parts

Part Overview

The OPB891L51 is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a through-beam phototransistor optical sensor with PCB mount configuration. This component features a 0.125" (3.18mm) sensing distance and is designed for slot-type optical sensing applications. The OPB891L51 is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB891L51
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	Chassis Mount
Package / Case	PCB Mount
Type	Unamplified
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the OPB891L51 are determined by strict equivalence 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: Chassis Mount
Package / Case: PCB Mount
Type: Unamplified

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are grouped into two categories: manufacturer-recommended parts (active product status) and parametric equivalents (active or obsolete status).

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
OPB891L51	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	RoHS non-compliant
OPB891T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB890L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB890T11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB890T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB890T55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB891T55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB892L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB892T55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant
OPB890L55Z	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the OPB891L51, the primary recommendation is OPB891T51Z. This part is the manufacturer-recommended direct substitute, maintains identical electrical and mechanical specifications, and carries active product status with ROHS3 compliance. The transition from RoHS non-compliant to ROHS3 compliant status aligns with current regulatory requirements.

Alternative active substitutes include OPB890L11Z, OPB890T11Z, OPB890T51Z, OPB890T55Z, OPB891T55Z, OPB892L51Z, and OPB892T55Z. All maintain parametric equivalence across critical specifications. Selection among these alternatives should be based on packaging availability, inventory levels, and specific application requirements.

OPB890L55Z is listed as obsolete and should not be selected for new designs, though it remains parametrically equivalent for legacy system support if inventory is available.

Frequently Asked Questions (FAQ)

Q: Can OPB891T51Z be used as a direct replacement for OPB891L51?

A: Yes. OPB891T51Z is the manufacturer-recommended substitute and maintains identical electrical and mechanical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between OPB891 and OPB890 series parts?

A: Both series maintain identical electrical and mechanical parameters specified for this application. The series designation reflects internal manufacturer classification but does not affect functional equivalence for the parameters listed.

Q: Are all listed substitutes suitable for new designs?

A: All active status parts (OPB891T51Z, OPB890L11Z, OPB890T11Z, OPB890T51Z, OPB890T55Z, OPB891T55Z, OPB892L51Z, OPB892T55Z) are suitable for new designs. OPB890L55Z is obsolete and should be used only for legacy system support.

Q: Does packaging type affect substitution?

A: All listed parts share identical PCB mount packaging and chassis mount configuration. Packaging differences (Bulk versus unspecified) relate to procurement format only and do not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to substitute parts?

A: All active substitute parts carry ROHS3 compliance and REACH Unaffected status. The original OPB891L51 is RoHS non-compliant. Compliance requirements should be verified against specific application and regional regulations.

Q: Are there inventory considerations for part selection?

A: Inventory levels vary across substitute parts. OPB890L11Z shows the highest inventory (3656 Pcs), while OPB892T55Z shows the lowest (741 Pcs). Procurement timelines should account for available stock levels.

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