OPB940L51 Equivalent & Substitute Parts

Part Overview

The OPB940L51 is a through-beam optical sensor manufactured by TT Electronics/Optek Technology, part of the Photologic® series. This component features a 0.125" (3.18mm) sensing distance with PCB mount configuration and totem pole buffer output. The OPB940L51 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Active alternatives within the same electrical and mechanical specifications are available to ensure uninterrupted component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB940L51
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Series	Photologic®
Product Status	Obsolete
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	Totem Pole, 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the OPB940L51 is determined by strict equivalence across the following critical parameters:

Sensing Distance: 0.125" (3.18mm)
Sensing Method: Through-Beam
Output Configuration: Totem Pole, Buffer
Current - Supply: 15 mA
Voltage - Supply: 4.75V ~ 5.25V
Response Time: 70ns
Operating Temperature: -40°C ~ 70°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

Substitute parts are grouped into two categories based on mounting configuration:

Category 1: PCB Mount Through Hole (Direct Electrical & Mechanical Equivalents) OPB930L51, OPB930L55, OPB960L51, OPB960N11, OPB960N51, OPB960N55, OPB960P51, OPB960T11, OPB960T51

Category 2: Module with Wire Leads (Electrical Equivalent, Different Mounting) OPB940W51Z

All substitute parts maintain identical electrical specifications and compliance certifications. Mounting type differences require mechanical redesign consideration.

Parameter Comparison

Parameter	OPB940L51	OPB930L51	OPB930L55	OPB940W51Z	OPB960L51	OPB960N11	OPB960N51	OPB960N55	OPB960P51	OPB960T11	OPB960T51
Manufacturer	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology	TT Electronics/Optek Technology
Series	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®	Photologic®
Sensing Distance	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	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	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam	Through-Beam
Output Configuration	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer	Totem Pole, Buffer
Mounting Type	Through Hole	Through Hole	Through Hole	Chassis Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Current - Supply	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Response Time	70ns	70ns	70ns	70ns	70ns	70ns	70ns	70ns	70ns	70ns	70ns
Operating Temperature	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For applications currently using OPB940L51, direct substitution is available through the OPB930 and OPB960 series variants, all of which maintain active product status. These alternatives provide identical electrical performance and compliance certifications.

For PCB mount through-hole applications, OPB960T51 offers the highest inventory availability (20,199 units) while maintaining full electrical and mechanical equivalence. OPB960N51 (8,810 units) and OPB960T11 (1,065 units) provide additional through-hole options.

For applications requiring PCB mount configuration with alternative base product numbers, OPB930L51 and OPB930L55 are active alternatives with equivalent specifications.

For applications where module-based construction with wire leads is acceptable, OPB940W51Z provides electrical equivalence with chassis mount configuration and substantial inventory (2,247 units).

All substitute parts carry ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original OPB940L51 specification.

Frequently Asked Questions (FAQ)

Q: Can OPB960T51 directly replace OPB940L51 on existing PCBs? A: OPB960T51 maintains identical electrical specifications (15 mA supply current, 4.75V–5.25V supply voltage, 70ns response time, -40°C to 70°C operating range) and through-hole PCB mount configuration. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between OPB930L51, OPB930L55, and OPB960 series variants? A: All variants share identical electrical parameters and sensing characteristics. Differences exist only in base product number designation (OPB930 vs. OPB960) and internal configuration codes (L51, L55, N11, N51, N55, P51, T11, T51). Electrical performance and compliance certifications remain equivalent across all variants.

Q: Is OPB940W51Z suitable as a replacement if PCB mount is required? A: OPB940W51Z provides electrical equivalence but uses chassis mount with wire leads instead of through-hole PCB mount. This requires mechanical redesign of the mounting interface. Use only if mechanical accommodation is feasible.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the original OPB940L51 regulatory classification.

Q: Which substitute part has the best inventory availability? A: OPB960T51 maintains the highest inventory level at 20,199 units, followed by OPB960N51 at 8,810 units. Both are active products with identical electrical specifications to OPB940L51.

Q: Can I use OPB930L55 instead of OPB930L51? A: OPB930L55 and OPB930L51 are electrically and mechanically equivalent. Both are active products with identical sensing distance, output configuration, supply current, voltage range, response time, and operating temperature specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message