OPB870P55 Equivalent & Substitute Parts

Part Overview

The OPB870P55 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 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 when applications require alternative sourcing due to inventory constraints, lead time considerations, or design flexibility within the same electrical and mechanical parameter envelope.

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
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 OPB870P55 are qualified based on strict electrical and mechanical parameter matching. All substitute parts listed maintain identical specifications across the following critical parameters:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-Beam
Output configuration: Phototransistor
Maximum DC forward current: 50 mA
Maximum collector current: 30 mA
Maximum collector-emitter breakdown voltage: 30 V
Mounting type: Chassis Mount
Package configuration: Module, Pre-Wired
Sensor type: Unamplified
RoHS compliance: ROHS3 Compliant
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories based on operating temperature range: parts rated -40°C ~ 85°C (full range equivalent to OPB870P55) and parts rated -40°C ~ 80°C (1°C reduction at upper limit). Parts with -40°C ~ 80°C operating temperature are suitable for applications where the upper temperature limit does not exceed 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 (Pcs)
OPB870P55	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	1008
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
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
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
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
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
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
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
OPB829CZ	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	1185
OPB829DZ	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	5613
OPB830W11Z	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	2618

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the OPB870P55 within their specified operating temperature ranges. Selection between full-range (-40°C ~ 85°C) and reduced-range (-40°C ~ 80°C) substitutes depends on application temperature requirements.

Full-range equivalents (OPB360N51, OPB365N51, OPB370N51, OPB370N55, OPB380P55Z, OPB390P11Z) are direct replacements for applications requiring the complete -40°C ~ 85°C operating envelope. OPB370N55 offers the highest inventory availability at 90,400 units.

Reduced-range substitutes (OPB829AZ, OPB829CZ, OPB829DZ, OPB830W11Z) are suitable for applications where the maximum operating temperature does not exceed 80°C. These parts maintain all other electrical and mechanical specifications identical to the main part. OPB829DZ provides the highest inventory among reduced-range options at 5,613 units.

All substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) rating, matching the regulatory and environmental specifications of the OPB870P55.

Frequently Asked Questions (FAQ)

Q: Can OPB370N55 be used as a direct replacement for OPB870P55?

A: Yes. OPB370N55 is a full parametric equivalent with identical electrical specifications (50 mA If max, 30 mA Ic max, 30 V VCE breakdown), sensing distance (0.125"), sensing method (through-beam), output configuration (phototransistor), mounting type (chassis mount), and operating temperature range (-40°C ~ 85°C). The part is ROHS3 compliant and MSL 1 rated.

Q: What is the difference between OPB870P55 and OPB829DZ?

A: The primary difference is operating temperature range. OPB870P55 operates from -40°C ~ 85°C, while OPB829DZ operates from -40°C ~ 80°C. All other electrical and mechanical parameters are identical. OPB829DZ is suitable for applications where maximum operating temperature does not exceed 80°C.

Q: Are all substitute parts pre-wired modules?

A: Yes. All listed substitute parts are supplied as Module, Pre-Wired configuration with chassis mount mounting type, matching the OPB870P55 package specification.

Q: Do substitute parts have the same current ratings?

A: Yes. All substitute parts maintain identical maximum current specifications: 50 mA DC forward current (If) and 30 mA collector current (Ic).

Q: Which substitute part has the highest inventory availability?

A: OPB370N55 has the highest inventory at 90,400 units and is a full parametric equivalent with -40°C ~ 85°C operating temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) rating, matching the regulatory status of the OPB870P55.

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