OPB706C Equivalent & Substitute Parts

Part Overview

The OPB706C is a reflective optical sensor manufactured by TT Electronics/Optek Technology, designed for applications requiring short-distance object detection through reflective sensing. This 4-DIP module component operates with a sensing distance of 0.050" (1.27mm) and outputs via phototransistor. The part is currently active in production with 947 units in stock inventory.

Substitute parts become necessary when OPB706C availability is constrained, when design requirements permit alternative sensing distances, or when different package configurations are acceptable for system integration.

Key Parameters

Parameter	OPB706C Value
Manufacturer	TT Electronics/Optek Technology
Category	Optical Sensors
Sensing Method	Reflective
Sensing Distance	0.050" (1.27mm)
Output Type	Phototransistor
Voltage - Collector Emitter Breakdown (Max)	24 V
Current - Collector (Ic) (Max)	25 mA
Current - DC Forward (If) (Max)	50 mA
Mounting Type	Through Hole
Package / Case	4-DIP Module
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the OPB706C is determined by the following critical parameters: reflective sensing method, phototransistor output type, through-hole mounting, and electrical ratings within acceptable ranges. The substitute parts identified—RPR-220 and RPR-220PC30N—share the core functional characteristics of reflective optical sensing with phototransistor output.

The primary difference between OPB706C and its substitutes is sensing distance: OPB706C operates at 0.050" (1.27mm), while RPR-220 and RPR-220PC30N operate at 0.236" (6mm). This represents a functional variation that may or may not be acceptable depending on application requirements.

Package configuration differs between substitutes: RPR-220PC30N maintains the 4-DIP Module package matching OPB706C, while RPR-220 uses a Radial - 4 Leads package. Electrical ratings for substitute parts exceed OPB706C specifications in collector-emitter breakdown voltage (30 V vs. 24 V) and collector current (30 mA vs. 25 mA), making them electrically compatible in circuits designed for OPB706C.

Parameter Comparison

Parameter	OPB706C	RPR-220PC30N	RPR-220
Manufacturer	TT Electronics/Optek Technology	Rohm Semiconductor	Rohm Semiconductor
Sensing Method	Reflective	Reflective	Reflective
Sensing Distance	0.050" (1.27mm)	0.236" (6mm)	0.236" (6mm)
Output Type	Phototransistor	Phototransistor	Phototransistor
Voltage - Collector Emitter Breakdown (Max)	24 V	30 V	30 V
Current - Collector (Ic) (Max)	25 mA	30 mA	30 mA
Current - DC Forward (If) (Max)	50 mA	30 mA	30 mA
Response Time	—	10µs	10µs
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP Module	4-DIP Module	Radial - 4 Leads
Operating Temperature	-40°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Obsolete	Active

Engineering Selection Recommendations

RPR-220 is the preferred active substitute for OPB706C when sensing distance variation is acceptable. This part maintains active production status, ensuring long-term availability. Both parts are ROHS3 compliant and carry identical REACH unaffected status. The radial package configuration of RPR-220 requires PCB layout modification compared to the 4-DIP module footprint of OPB706C.

RPR-220PC30N provides package compatibility with OPB706C through its 4-DIP Module configuration, eliminating PCB redesign requirements. However, this part carries obsolete product status, indicating discontinued manufacturing. Selection of RPR-220PC30N should be limited to applications where existing inventory is available and long-term supply is not a consideration.

Both substitute parts operate within narrower temperature ranges (-25°C to 85°C) compared to OPB706C (-40°C to 85°C). Applications requiring operation below -25°C must retain OPB706C.

Frequently Asked Questions (FAQ)

Q: Can RPR-220 directly replace OPB706C without PCB modification?

A: RPR-220 uses a Radial - 4 Leads package while OPB706C uses a 4-DIP Module package. Direct footprint substitution is not possible. PCB layout modification is required.

Q: Is RPR-220PC30N suitable for new designs?

A: RPR-220PC30N carries obsolete product status. While it maintains 4-DIP Module package compatibility with OPB706C, it is not recommended for new designs due to discontinued manufacturing. RPR-220 is the active alternative.

Q: What is the impact of the 0.236" (6mm) sensing distance in RPR-220 compared to OPB706C's 0.050" (1.27mm)?

A: The substitute parts detect objects at significantly greater distances. Applications designed for close-proximity sensing at 1.27mm may not function correctly with 6mm sensing distance. Application requirements must be evaluated before substitution.

Q: Are the electrical ratings of substitute parts compatible with OPB706C circuits?

A: Yes. RPR-220 and RPR-220PC30N both exceed OPB706C electrical specifications: 30 V collector-emitter breakdown versus 24 V, and 30 mA collector current versus 25 mA. Circuits designed for OPB706C operate within substitute part ratings.

Q: What temperature range limitation applies to substitutes?

A: Both RPR-220 and RPR-220PC30N operate from -25°C to 85°C, compared to OPB706C's -40°C to 85°C. Applications requiring operation below -25°C cannot use these substitutes.

Q: Do all parts meet the same compliance standards?

A: Yes. OPB706C, RPR-220, and RPR-220PC30N are all ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications.

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