OPB971P55 Equivalent & Substitute Parts

Part Overview

The OPB971P55 is a through-beam optical sensor from TT Electronics / Optek Technology's Photologic® series, designed for 0.125" (3.18mm) PCB mount applications. This part operates with NPN open collector buffer output configuration and is classified as obsolete. Due to its obsolete status, equivalent active substitute parts are available from the same manufacturer that maintain identical electrical and mechanical specifications, enabling direct replacement in existing designs.

Key Parameters

Parameter	Value
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	NPN - Open Collector, Buffer
Mounting Type	Through Hole
Current - Supply	15 mA
Voltage - Supply	4.75V ~ 5.25V
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Package / Case	PCB Mount
Series	Photologic®
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the OPB971P55 is determined by strict equivalence across all critical electrical and mechanical parameters. All substitute parts maintain identical specifications in the following key areas:

Sensing distance: 0.125" (3.18mm)
Sensing method: Through-beam optical detection
Output configuration: NPN open collector with buffer
Supply voltage range: 4.75V ~ 5.25V
Supply current: 15 mA
Response time: 70ns
Operating temperature range: -40°C ~ 70°C
Mounting configuration: Through hole PCB mount
Environmental compliance: ROHS3 compliant, REACH unaffected, MSL 1

The substitute parts are organized into two base product families: OPB961 and OPB971 series. Within each family, variants differ only in packaging type (Bulk) and internal configuration codes (N11, N51, N55, T11, T51), which do not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Sensing Method	Output Configuration	Supply Voltage	Supply Current	Response Time	Operating Temperature	Mounting Type	RoHS Status
OPB971P55	TT Electronics / Optek Technology	Obsolete	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB961N11	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB961N51	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB961N55	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB961T51	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB971N11	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB971N51	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant
OPB971T11	TT Electronics / Optek Technology	Active	0.125" (3.18mm)	Through-Beam	NPN - Open Collector, Buffer	4.75V ~ 5.25V	15 mA	70ns	-40°C ~ 70°C	Through Hole	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products from TT Electronics / Optek Technology and maintain full ROHS3 compliance and REACH unaffected status. The OPB961 series (OPB961N11, OPB961N51, OPB961N55, OPB961T51) and OPB971 series (OPB971N11, OPB971N51, OPB971T11) are functionally equivalent to the obsolete OPB971P55 across all specified electrical and mechanical parameters.

Selection among substitute parts should be based on inventory availability and packaging requirements, as all variants are electrically and mechanically interchangeable. The OPB961T51 offers the highest inventory availability at 20,099 units. The OPB961N51 and OPB971N51 provide substantial inventory levels at 3,807 and 3,200 units respectively.

Frequently Asked Questions (FAQ)

Q: Can OPB961 series parts directly replace OPB971P55? A: Yes. The OPB961 series maintains identical electrical specifications, sensing distance, output configuration, supply voltage, current draw, response time, and operating temperature range. Through-hole PCB mounting is identical.

Q: What is the difference between OPB961N51 and OPB961T51? A: Both parts are electrically and mechanically equivalent. The designation suffix (N51 vs T51) indicates internal configuration variants that do not affect performance or compatibility. Selection can be based on availability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the environmental certifications of the original OPB971P55.

Q: Does packaging type affect electrical performance? A: No. All substitute parts are supplied in Bulk packaging and maintain identical electrical and mechanical specifications regardless of packaging designation.

Q: Can I use OPB971N11 as a substitute for OPB971P55? A: Yes. The OPB971N11 is an active product variant within the same OPB971 series with identical electrical and mechanical parameters.

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