OPB877N55 Equivalent & Substitute Parts

Part Overview

The OPB877N55 is an optical sensor through-beam phototransistor module manufactured by TT Electronics/Optek Technology. This unamplified optical sensor operates with a 0.125" (3.18mm) sensing distance and is designed for chassis mount applications in pre-wired module configuration. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and operational parameters to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	OPB877N55 Specification
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	Module, Pre-Wired
Type	Unamplified
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the OPB877N55 are qualified based on the following critical parameters:

Sensing Distance: 0.125" (3.18mm) — determines optical path and detection range
Sensing Method: Through-Beam — defines operational principle
Output Configuration: Phototransistor — specifies signal output type
Current Ratings: If (Max) 50 mA and Ic (Max) 30 mA — electrical load compatibility
Voltage Rating: Collector Emitter Breakdown 30 V — maximum voltage tolerance
Mounting Type: Chassis Mount — mechanical interface requirement
Package Configuration: Module, Pre-Wired — form factor and connectivity
Type: Unamplified — signal processing characteristic

All substitute parts listed maintain identical specifications across these parameters. Operating temperature ranges may vary within acceptable limits for specific applications. All parts are ROHS3 compliant and carry MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Config	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temp	Mounting	Package	Type	RoHS
OPB877N55	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB360N51	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB365N51	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB370N51	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB370N55	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB380P55Z	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB390P11Z	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB829AZ	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB829CZ	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB829DZ	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3
OPB830W11Z	TT Electronics/Optek	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the OPB877N55. Selection among equivalents should be based on:

Product Status and Availability: All parts carry Active status. Inventory levels vary; OPB370N55 offers highest stock availability at 90,400 units.

Compliance and Certifications: All substitute parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is uniformly MSL 1 (Unlimited) across all options.

Operating Temperature Range: OPB877N55, OPB360N51, OPB365N51, OPB370N51, OPB370N55, OPB380P55Z, and OPB390P11Z support -40°C to 85°C operation. OPB829AZ, OPB829CZ, OPB829DZ, and OPB830W11Z operate within -40°C to 80°C. For applications requiring the full 85°C upper limit, select from the first group.

Electrical Specifications: All parts share identical current and voltage ratings, ensuring direct circuit compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can OPB829AZ, OPB829CZ, OPB829DZ, or OPB830W11Z be used in place of OPB877N55 in all applications?

A: These parts are electrically and mechanically equivalent with one exception: their maximum operating temperature is 80°C rather than 85°C. They are suitable for applications with operating temperatures up to 80°C. For designs requiring operation at 85°C, use OPB360N51, OPB365N51, OPB370N51, OPB370N55, OPB380P55Z, or OPB390P11Z.

Q: What determines substitutability between these optical sensor modules?

A: Substitutability is determined by matching sensing distance (0.125"), sensing method (through-beam), output type (phototransistor), current ratings (If 50 mA max, Ic 30 mA max), voltage rating (30 V breakdown), mounting configuration (chassis mount), and package form (module, pre-wired). All listed parts meet these criteria.

Q: Are there differences in package variants among the substitute parts?

A: All substitute parts use identical module, pre-wired package configuration suitable for chassis mount applications. Suffix variations in part numbers (N51, N55, P55Z, P11Z, W11Z, AZ, CZ, DZ) indicate internal design or manufacturing variants but do not affect external mechanical or electrical interface compatibility.

Q: Do all substitute parts carry the same compliance certifications?

A: Yes. All parts listed are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. ECCN and HTSUS classifications are identical across all options.

Q: Which substitute part offers the best inventory availability?

A: OPB370N55 maintains the highest stock level at 90,400 units. For immediate availability requirements, this part is the preferred selection among equivalents.

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