SEP8506-002 Infrared Emitter 935nm Equivalent & Substitute Parts

Part Overview

The SEP8506-002 is an infrared (IR) emitter manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm wavelength applications with 50mA maximum forward current and 1.5V typical forward voltage. This component features a radial, 3mm diameter (T-1) through-hole package with a 50° viewing angle and side view orientation.

The SEP8506-002 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this infrared emitter specification.

Key Parameters

Parameter	Value	Unit
Wavelength	935nm	nm
Current - DC Forward (If) Max	50mA	mA
Voltage - Forward (Vf) Typical	1.5V	V
Radiant Intensity (Ie) Min @ If	0.33mW/cm² @ 20mA	mW/cm²
Viewing Angle	50°	degrees
Mounting Type	Through Hole	—
Package / Case	Radial, 3mm Dia (T-1)	—
Operating Temperature	-40°C ~ 85°C	°C
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SEP8506-002 is determined by the following critical parameters:

Primary Matching Criteria:

Wavelength: 935nm or 940nm (near-infrared spectrum compatibility)
Current - DC Forward (If) Max: 50mA
Mounting Type: Through Hole
Package Type: Radial configuration
Orientation: Side View

Secondary Compatibility Factors:

Voltage - Forward (Vf) Typical: 1.5V to 1.6V (acceptable tolerance range)
Viewing Angle: 40° to 50° (application-dependent)
Operating Temperature Range: Minimum -40°C to maximum 85°C or higher
RoHS Compliance: Required for regulatory alignment

The substitute parts listed below meet these criteria and are classified as active products with current manufacturing status, ensuring ongoing availability and supply chain reliability.

Parameter Comparison

Part Number	Manufacturer	Wavelength (nm)	If Max (mA)	Vf Typ (V)	Radiant Intensity @ If	Viewing Angle (°)	Operating Temp (°C)	Product Status	RoHS Status
SEP8506-002	Honeywell	935	50	1.5	0.33mW/cm² @ 20mA	50	-40 ~ 85	Obsolete	RoHS Compliant
OP140B	TT Electronics/Optek	935	50	1.6	0.3mW/cm² @ 20mA	40	-40 ~ 100	Active	ROHS3 Compliant
OP140C	TT Electronics/Optek	935	50	1.6	0.2mW/cm² @ 20mA	40	-40 ~ 100	Active	ROHS3 Compliant
OP140D	TT Electronics/Optek	935	50	1.6	0.1mW/cm² @ 20mA	40	-40 ~ 100	Active	ROHS3 Compliant
OP145C	TT Electronics/Optek	935	50	1.6	0.2mW/cm² @ 20mA	40	-40 ~ 100	Active	ROHS3 Compliant
QEE113	onsemi	940	50	1.5	3mW/sr @ 100mA	50	-40 ~ 100	Active	ROHS3 Compliant

Engineering Selection Recommendations

Active Product Substitutes (Recommended for New Designs):

The OP140B, OP140C, OP140D, and OP145C from TT Electronics/Optek Technology are active products with ROHS3 compliance and extended operating temperature ranges (-40°C to 100°C). These parts maintain 935nm wavelength specification, 50mA maximum forward current, and through-hole radial mounting compatibility with the SEP8506-002. Forward voltage tolerance increases from 1.5V to 1.6V, which is within acceptable circuit design margins. Radiant intensity varies across the OP140 series, allowing selection based on application-specific optical output requirements.

Alternative Wavelength Substitute:

The QEE113 from onsemi operates at 940nm wavelength instead of 935nm. This 5nm wavelength shift remains within the near-infrared spectrum and is suitable for applications where wavelength tolerance permits. The QEE113 maintains 50mA maximum forward current, 1.5V typical forward voltage, 50° viewing angle, and side view orientation matching the original SEP8506-002. Operating temperature range extends to 100°C. ROHS3 compliance and active product status ensure supply chain continuity.

Product Status Consideration:

The SEP8506-002 is obsolete. All substitute parts listed are active products with current manufacturing support, ensuring long-term availability and supply reliability for production requirements.

Frequently Asked Questions (FAQ)

Q: Can OP140B, OP140C, or OP140D be used interchangeably with SEP8506-002?

A: Yes, within application-specific optical output requirements. All three parts share 935nm wavelength, 50mA maximum forward current, 1.6V typical forward voltage, and through-hole radial mounting. The primary difference is radiant intensity: OP140B provides 0.3mW/cm², OP140C provides 0.2mW/cm², and OP140D provides 0.1mW/cm² at 20mA. The SEP8506-002 specifies 0.33mW/cm² at 20mA. Select the OP140 variant matching your application's optical intensity requirements.

Q: What is the difference between OP140C and OP145C?

A: Both parts share identical electrical and optical specifications: 935nm wavelength, 50mA maximum forward current, 1.6V typical forward voltage, 0.2mW/cm² radiant intensity at 20mA, 40° viewing angle, and -40°C to 100°C operating temperature. The difference is the base product number designation (OP140 versus OP145). Functionally, they are equivalent for circuit design purposes.

Q: Why does QEE113 have a different wavelength (940nm instead of 935nm)?

A: The QEE113 operates at 940nm, a 5nm shift from the SEP8506-002 specification of 935nm. This wavelength difference is within the near-infrared spectrum. QEE113 substitution is appropriate only for applications where the design tolerates this wavelength variation. Verify application requirements before selecting QEE113 as a substitute.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SEP8506-002 is RoHS Compliant. All substitute parts (OP140B, OP140C, OP140D, OP145C, and QEE113) are ROHS3 Compliant, meeting current regulatory requirements.

Q: What is the viewing angle difference between SEP8506-002 and the OP140 series?

A: The SEP8506-002 specifies a 50° viewing angle. The OP140B, OP140C, and OP140D specify 40° viewing angles. This 10° difference affects the optical beam spread. The narrower 40° angle concentrates optical output over a smaller area. Select based on your application's field-of-view requirements. The QEE113 maintains the 50° viewing angle of the original part.

Q: Can I use these substitutes in existing PCB designs without layout modifications?

A: All substitute parts feature through-hole radial mounting in standard configurations compatible with the SEP8506-002 footprint. No PCB layout modifications are required. Verify lead spacing and package dimensions with component datasheets before assembly.

Q: What is the inventory status of these substitute parts?

A: OP140B has 17,182 pieces in stock. OP140C has 4,762 pieces in stock. OP140D has 6,362 pieces in stock. OP145C has 792 pieces in stock. QEE113 has 569,700 pieces in stock. All parts are classified as new original stock.

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