OPB993N51 Equivalent & Substitute Parts

Part Overview

The OPB993N51 is an optical sensor manufactured by TT Electronics/Optek Technology, classified as a through-beam photoelectric sensor with 0.125" (3.18mm) sensing distance. This component features NPN open collector inverted output configuration and is housed in a module with wire leads for chassis mount applications. The OPB993N51 is currently listed as obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring compatible through-beam optical sensing functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPB993N51
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Series	Photologic®
Sensing Distance	0.125" (3.18mm)
Sensing Method	Through-Beam
Output Configuration	NPN - Open Collector, Inverted
Mounting Type	Chassis Mount
Current - Supply	15 mA
Voltage - Supply	4.75V ~ 5.25V
Response Time	70ns
Operating Temperature	-40°C ~ 70°C
Package / Case	Module, Wire Leads
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OPB993N51 is determined by strict equivalence across the following critical parameters:

Sensing Distance: 0.125" (3.18mm) through-beam configuration
Output Configuration: NPN open collector with inverted logic
Electrical Specifications: 15 mA supply current, 4.75V ~ 5.25V supply voltage, 70ns response time
Operating Temperature Range: -40°C ~ 70°C
Package Type: Module with wire leads for chassis mount
Series Compatibility: Photologic® series from TT Electronics/Optek Technology

All substitute parts listed maintain identical electrical and mechanical parameters to the OPB993N51. The primary distinction among substitutes is product status (active vs. obsolete) and RoHS compliance level. Active substitute parts are available in higher inventory quantities and meet current regulatory compliance standards (ROHS3).

Parameter Comparison

Part Number	Manufacturer	Product Status	Sensing Distance	Output Configuration	Supply Current	Supply Voltage	Response Time	Operating Temperature	RoHS Status	Inventory (Pcs)
OPB993N51	TT Electronics/Optek Technology	Obsolete	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	RoHS non-compliant	938
OPB933W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	3489
OPB933W55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	1243
OPB943W51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	1180
OPB983L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	896
OPB983L51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	1900
OPB983P11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	998
OPB983P51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	2108
OPB983T51Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	20199
OPB993L11Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	1716
OPB993L55Z	TT Electronics/Optek Technology	Active	0.125" (3.18mm)	NPN - Open Collector, Inverted	15 mA	4.75V ~ 5.25V	70ns	-40°C ~ 70°C	ROHS3 Compliant	722

Engineering Selection Recommendations

All listed substitute parts are direct functional equivalents to the OPB993N51 and maintain identical electrical and mechanical specifications. Selection among substitutes should prioritize active product status and regulatory compliance:

Primary Selection Criteria:

Product Status: All substitute parts listed are active products, ensuring long-term availability and manufacturing support compared to the obsolete OPB993N51.
RoHS Compliance: All substitute parts meet ROHS3 compliance standards, whereas the OPB993N51 is RoHS non-compliant. For applications subject to RoHS regulations or requiring compliance documentation, substitute parts are mandatory.
Inventory Availability: OPB983T51Z offers the highest inventory level (20,199 pcs), followed by OPB933W51Z (3,489 pcs) and OPB983L51Z (1,900 pcs). Inventory levels support procurement planning for volume requirements.
Packaging Designation: All substitutes are supplied in bulk packaging, consistent with the original part's module wire leads configuration.

For new designs or system upgrades, OPB983T51Z is recommended based on superior inventory availability and active product status. For direct replacement in existing systems, any listed substitute maintains full electrical and mechanical compatibility with the OPB993N51.

Frequently Asked Questions (FAQ)

Q: Can OPB933W51Z, OPB943W51Z, and OPB983 series parts be used interchangeably with OPB993N51?

A: Yes. All listed substitute parts maintain identical sensing distance (0.125" / 3.18mm), output configuration (NPN open collector inverted), supply specifications (15 mA at 4.75V ~ 5.25V), response time (70ns), operating temperature range (-40°C ~ 70°C), and package type (module with wire leads). Electrical and mechanical compatibility is complete.

Q: What is the difference between OPB933, OPB943, and OPB983 base part numbers?

A: The base part number designates the sensor model within the Photologic® series. All variants listed maintain identical electrical specifications and sensing characteristics. Differences are encoded in the suffix characters (W, L, P, T) and final digits (11, 51, 55), which represent internal design variations that do not affect functional compatibility for through-beam 3.18mm sensing applications.

Q: Why is OPB993N51 listed as obsolete?

A: The OPB993N51 is no longer in active production. Substitute parts from the same manufacturer provide equivalent functionality with active product status, ensuring continued availability and support.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance relates to material composition and manufacturing processes, not electrical performance. All substitute parts deliver identical electrical specifications to the OPB993N51.

Q: Which substitute part should be selected for new designs?

A: OPB983T51Z is recommended for new designs based on active product status, ROHS3 compliance, and highest inventory availability (20,199 pcs). OPB933W51Z and OPB983L51Z are secondary options with strong inventory support.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied as modules with wire leads in bulk packaging, maintaining the same form factor and mounting configuration as the OPB993N51.

Q: Can substitute parts be used in applications with temperature extremes?

A: All parts, including substitutes, operate within -40°C ~ 70°C. Applications requiring operation outside this range are not supported by any listed part.

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