OPB891N55Z Equivalent & Substitute Parts

Part Overview

The OPB891N55Z is an optical sensor through-beam phototransistor module with 0.125" (3.18mm) sensing distance, manufactured by TT Electronics/Optek Technology. This component features pre-wired free hanging mounting and unamplified output configuration. The part is currently obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the OPB891N55Z is determined by electrical and mechanical parameter alignment across the optical sensor product line. The critical parameters governing substitutability are:

Electrical Parameters: Sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), maximum collector current (30 mA), maximum forward current (50 mA), and collector-emitter breakdown voltage (30 V).

Environmental Parameters: Operating temperature range (-40°C ~ 85°C), RoHS3 compliance, and MSL rating (1).

Mechanical Parameters: Package type and mounting configuration.

The substitute parts OPB891T55Z, OPB880N11Z, and OPB880N55Z maintain identical electrical specifications and environmental ratings. The primary distinction lies in mounting type: OPB891T55Z uses PCB mount (chassis mount) configuration, while OPB880N11Z and OPB880N55Z retain the pre-wired free hanging module format of the original part.

Parameter Comparison

Parameter	OPB891N55Z	OPB891T55Z	OPB880N11Z	OPB880N55Z
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology
Product Status	Obsolete	Active	Active	Active
Sensing Distance	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)
Sensing Method	Through-Beam	Through-Beam	Through-Beam	Through-Beam
Output Configuration	Phototransistor	Phototransistor	Phototransistor	Phototransistor
Current - DC Forward (If) (Max)	50 mA	50 mA	50 mA	50 mA
Current - Collector (Ic) (Max)	30 mA	30 mA	30 mA	30 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Type	Unamplified	Unamplified	Unamplified	Unamplified
Mounting Type	Free Hanging	Chassis Mount	Free Hanging	Free Hanging
Package / Case	Module, Pre-Wired	PCB Mount	Module, Pre-Wired	Module, Pre-Wired
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Free Hanging Module Format): OPB880N11Z and OPB880N55Z are parametric equivalents maintaining identical electrical specifications, environmental ratings, and pre-wired module configuration. Both parts are in active production status, ensuring long-term availability and supply chain stability compared to the obsolete OPB891N55Z.

For PCB Mount Applications: OPB891T55Z provides electrical equivalence with modified mounting configuration (chassis mount, PCB mount package). This option is suitable for designs requiring direct PCB integration rather than free hanging installation.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL rating (1), ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can OPB891T55Z replace OPB891N55Z in existing assemblies? A: Electrical substitution is valid; however, mounting configuration differs. OPB891T55Z uses PCB mount (chassis mount) versus the free hanging module format of OPB891N55Z. Physical integration modifications may be required.

Q: What is the difference between OPB880N11Z and OPB880N55Z? A: Both parts are parametric equivalents with identical electrical and environmental specifications. The designation suffix indicates internal variant coding within the OPB880 base product line. Selection between these parts should be based on availability and supply chain requirements.

Q: Are all substitute parts in active production? A: Yes. OPB891T55Z, OPB880N11Z, and OPB880N55Z are all active production parts, providing supply continuity for the obsolete OPB891N55Z.

Q: Do substitute parts maintain the same electrical performance? A: All substitute parts maintain identical maximum ratings: 50 mA DC forward current, 30 mA collector current, 30 V collector-emitter breakdown voltage, and -40°C to 85°C operating temperature range.

Q: What mounting considerations apply when selecting a substitute? A: OPB891N55Z and its OPB880 series equivalents use free hanging pre-wired module mounting. OPB891T55Z requires PCB mount integration. Verify mechanical compatibility with your application's mounting infrastructure before selection.

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