OPB891L55 Equivalent & Substitute Parts

Part Overview

The OPB891L55 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 OPB891L55 is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB891L55
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

Substitution of the OPB891L55 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

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes are categorized as either manufacturer-recommended direct replacements or parametric equivalents. The primary distinction between substitute parts relates to product status (active vs. obsolete) and RoHS compliance status.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	Vce Breakdown (Max)	Operating Temperature	Mounting Type	Package	Type	Product Status	RoHS Status	Inventory
OPB891L55	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Obsolete	RoHS non-compliant	1160 Pcs
OPB891T55Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	1309 Pcs
OPB890L11Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	3656 Pcs
OPB890T11Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	1277 Pcs
OPB890T51Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	768 Pcs
OPB890T55Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	1452 Pcs
OPB891T51Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	1420 Pcs
OPB892L51Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	1109 Pcs
OPB892T55Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Active	ROHS3 Compliant	741 Pcs
OPB890L55Z	TT Electronics/Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	PCB Mount	Unamplified	Obsolete	ROHS3 Compliant	858 Pcs

Engineering Selection Recommendations

For applications currently using OPB891L55, OPB891T55Z is the manufacturer-recommended direct replacement. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original component.

For new designs or applications where component availability is a primary concern, OPB890L11Z, OPB890T11Z, OPB890T55Z, OPB891T51Z, OPB892L51Z, and OPB892T55Z are parametric equivalents with active product status and ROHS3 compliance. All listed substitutes maintain the critical electrical parameters: 50 mA maximum DC forward current, 30 mA maximum collector current, and 30 V maximum collector-emitter breakdown voltage.

OPB890L55Z is an alternative with active product status and ROHS3 compliance, though it shares obsolete status classification with the original OPB891L55 in certain product line contexts.

Frequently Asked Questions (FAQ)

Q: What makes OPB891T55Z the recommended replacement for OPB891L55?

A: OPB891T55Z is designated as the manufacturer-recommended replacement because it maintains identical electrical specifications (50 mA If max, 30 mA Ic max, 30 V Vce breakdown), mechanical configuration (PCB mount, chassis mount), and sensing characteristics (0.125" through-beam phototransistor). The primary advantages are active product status and ROHS3 compliance, eliminating obsolescence and regulatory concerns.

Q: Are all listed substitute parts electrically interchangeable with OPB891L55?

A: Yes. All substitute parts listed maintain identical maximum current ratings (50 mA DC forward, 30 mA collector), voltage breakdown (30 V), operating temperature range (-40°C to 85°C), sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), and mounting specifications (PCB mount, chassis mount). Electrical interchangeability is confirmed across all parameters provided.

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

A: The provided data specifies identical electrical and mechanical parameters for both OPB891 and OPB890 series parts listed as substitutes. Differentiation between series is not determined by the parameters provided in this reference.

Q: Does packaging type affect substitutability?

A: The OPB891L55 uses PCB mount packaging. All substitute parts maintain PCB mount configuration. Packaging differences are not present among the listed equivalents and substitutes.

Q: Why is RoHS compliance important for this substitution?

A: The original OPB891L55 is RoHS non-compliant. All active substitute parts (OPB891T55Z, OPB890L11Z, OPB890T11Z, OPB890T51Z, OPB890T55Z, OPB891T51Z, OPB892L51Z, OPB892T55Z) are ROHS3 compliant. This compliance status is relevant for applications subject to RoHS regulations and for long-term supply chain sustainability.

Q: Can I use OPB890L55Z as a substitute for OPB891L55?

A: OPB890L55Z maintains identical electrical and mechanical specifications and is parametrically equivalent. However, it shares obsolete product status with the original OPB891L55. For new procurement, active alternatives such as OPB891T55Z are preferred.

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