OPB831W51Z Equivalent & Substitute Parts

Part Overview

The OPB831W51Z is an optical sensor through-beam phototransistor module manufactured by TT Electronics / Optek Technology. This unamplified sensor operates with a 0.125" (3.18mm) sensing distance and chassis mount configuration, designed for applications requiring pre-wired optical detection. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, ensuring functional interchangeability within the defined parameter constraints.

Key Parameters

Parameter	OPB831W51Z 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 Range	-40°C ~ 80°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 OPB831W51Z are qualified based on strict parameter matching across the following criteria:

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
Mounting Type: Chassis Mount
Package / Case: Module, Pre-Wired
Type: Unamplified
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain these electrical and mechanical parameters. Operating temperature range variations are noted where they differ from the main part specification of -40°C ~ 80°C.

Parameter Comparison

Part Number	Manufacturer	Sensing Distance	Sensing Method	Output Configuration	If (Max)	Ic (Max)	VCE Breakdown (Max)	Operating Temperature	Mounting Type	Package / Case	Type	RoHS Status	Inventory
OPB831W51Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	902 Pcs
OPB360N51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	1394 Pcs
OPB365N51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	1916 Pcs
OPB370N51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	1250 Pcs
OPB370N55	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	90400 Pcs
OPB375N51	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	648 Pcs
OPB380P51Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	651 Pcs
OPB380P55Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	3121 Pcs
OPB390P11Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	1366 Pcs
OPB390P51Z	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 85°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	832 Pcs
OPB829AZ	TT Electronics / Optek Technology	0.125" (3.18mm)	Through-Beam	Phototransistor	50 mA	30 mA	30 V	-40°C ~ 80°C	Chassis Mount	Module, Pre-Wired	Unamplified	ROHS3 Compliant	2154 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the OPB831W51Z. Selection between substitute options depends on application-specific operating temperature requirements and inventory availability.

For applications operating within -40°C to 80°C, OPB829AZ provides direct thermal compatibility with the OPB831W51Z while maintaining all electrical specifications.

For applications requiring extended upper temperature operation to 85°C, OPB360N51, OPB365N51, OPB370N51, OPB370N55, OPB375N51, OPB380P51Z, OPB380P55Z, OPB390P11Z, and OPB390P51Z are suitable alternatives. OPB370N55 offers the highest inventory availability at 90400 units.

All parts are manufactured by TT Electronics / Optek Technology and share identical electrical parameters: 50 mA maximum forward current, 30 mA maximum collector current, and 30 V maximum collector-emitter breakdown voltage.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the OPB831W51Z?

A: Substitute parts must match the following parameters: 0.125" (3.18mm) sensing distance, through-beam sensing method, phototransistor output configuration, 50 mA maximum forward current, 30 mA maximum collector current, 30 V maximum collector-emitter breakdown voltage, chassis mount configuration, pre-wired module package, unamplified type, ROHS3 compliance, and MSL 1 rating.

Q: Can I use a substitute part with an 85°C upper operating temperature in a -40°C to 80°C application?

A: Yes. An extended temperature range is compatible with applications requiring a narrower range. The substitute part will function within the application's specified temperature limits.

Q: Are all substitute parts pre-wired modules?

A: Yes. All listed substitute parts are supplied as pre-wired modules with chassis mount configuration, matching the OPB831W51Z package type.

Q: What is the difference between parts with different suffix codes (e.g., N51, N55, P51Z, P55Z)?

A: Suffix codes indicate internal design variations within the OPB series. All listed parts maintain identical electrical and mechanical parameters specified for substitution compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting regulatory requirements equivalent to the OPB831W51Z.

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