OPB891L51Z Equivalent & Substitute Parts

Part Overview

The OPB891L51Z 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 with a 0.125" (3.18mm) sensing distance. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB891L51Z
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	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OPB891L51Z is 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
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are grouped by product status, with active parts recommended for new designs and obsolete parts suitable for legacy system maintenance.

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	Inventory
OPB891L51Z	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	955 Pcs
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	1420 Pcs
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	3656 Pcs
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	1277 Pcs
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	768 Pcs
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	1452 Pcs
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	1309 Pcs
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	1109 Pcs
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	741 Pcs
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	858 Pcs

Engineering Selection Recommendations

For new designs, select from active product status parts: OPB891T51Z, OPB890L11Z, OPB890T11Z, OPB890T51Z, OPB890T55Z, OPB891T55Z, OPB892L51Z, or OPB892T55Z. All active parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring regulatory conformance and handling flexibility.

For legacy system maintenance or replacement of existing OPB891L51Z installations, any listed substitute part provides electrical and mechanical equivalence. Obsolete parts OPB890L55Z and OPB891L51Z remain available in inventory but should not be specified for new designs.

Frequently Asked Questions (FAQ)

Q: Can OPB891T51Z directly replace OPB891L51Z? A: Yes. OPB891T51Z is a direct substitute with identical electrical specifications, sensing distance, output configuration, and operating temperature range. The primary difference is product status: OPB891T51Z is active while OPB891L51Z is obsolete.

Q: What distinguishes parts within the OPB890 and OPB891 series? A: All parts listed maintain identical electrical and mechanical parameters. Differences in part numbering reflect internal manufacturer designations and packaging variations, but do not affect functional equivalence for through-beam phototransistor optical sensing applications.

Q: Are there packaging differences between substitute parts? A: All substitute parts use PCB Mount configuration with Chassis Mount type. Packaging designation variations (such as Bulk versus unspecified) do not affect electrical or mechanical compatibility.

Q: Is ROHS3 compliance maintained across all substitutes? A: Yes. All substitute parts listed are ROHS3 compliant, maintaining regulatory equivalence with the original OPB891L51Z.

Q: Which substitute part has the highest inventory availability? A: OPB890L11Z has the highest inventory at 3656 pieces, followed by OPB890T55Z at 1452 pieces and OPB891T51Z at 1420 pieces.

Q: Can obsolete parts be used as substitutes? A: Obsolete parts OPB890L55Z and OPB891L51Z are electrically and mechanically equivalent but should only be used for legacy system maintenance. Active parts are recommended for all new designs and procurement.

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