SDP8476-201 Equivalent & Substitute Parts

Part Overview

The SDP8476-201 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm infrared detection in side view radial configuration. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The sensor operates through photoelectric conversion, converting incident infrared radiation into proportional collector current output.

Key Parameters

Parameter	Value	Unit
Wavelength	935	nm
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	6	mA
Current - Dark (Id) (Max)	100	nA
Power - Max	100	mW
Viewing Angle	20	°
Mounting Type	Through Hole	-
Orientation	Side View	-
Package / Case	Radial	-
Operating Temperature Range	-40 to 85	°C
RoHS Status	RoHS Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the SDP8476-201 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Wavelength: 935nm infrared detection capability
Voltage rating: Collector-Emitter breakdown voltage of 30V minimum
Mounting configuration: Through-hole radial package
Orientation: Side view optical axis alignment
Dark current specification: 100nA maximum leakage current
Power dissipation: 100mW maximum rating

The OP550B from TT Electronics / Optek Technology satisfies all critical substitution criteria. Both components share identical wavelength, voltage rating, dark current specification, power rating, mounting type, orientation, and package configuration. The OP550B maintains active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	SDP8476-201 (Honeywell)	OP550B (TT Electronics / Optek)	Compatibility
Wavelength	935 nm	935 nm	Identical
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Identical
Current - Collector (Ic) (Max)	6 mA	4.7 mA	OP550B rated lower; acceptable for applications not requiring full 6mA
Current - Dark (Id) (Max)	100 nA	100 nA	Identical
Power - Max	100 mW	100 mW	Identical
Mounting Type	Through Hole	Through Hole	Identical
Orientation	Side View	Side View	Identical
Package / Case	Radial	Radial	Identical
Operating Temperature Range	-40 to 85°C	-40 to 100°C	OP550B extends upper limit to 100°C
Product Status	Obsolete	Active	OP550B provides ongoing availability
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant; OP550B meets current standard
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

Primary Substitute: OP550B

The OP550B is the direct functional equivalent for SDP8476-201 replacement. Selection is based on the following engineering factors:

Electrical Compatibility: Identical voltage rating (30V), dark current specification (100nA), and power dissipation limit (100mW) ensure direct electrical substitution without circuit redesign.
Optical Compatibility: Both components operate at 935nm wavelength with identical side-view radial orientation, maintaining optical system performance.
Mechanical Compatibility: Through-hole radial package configuration is identical, permitting direct PCB footprint compatibility.
Product Status: OP550B maintains active product status with 1137 units in stock, providing supply chain continuity versus the obsolete SDP8476-201.
Compliance: OP550B meets ROHS3 compliance and REACH unaffected status, satisfying current regulatory requirements.
Temperature Performance: OP550B extends operating range to 100°C, providing enhanced thermal margin compared to SDP8476-201 (85°C maximum).

Design Consideration: The OP550B maximum collector current rating is 4.7mA versus 6mA for SDP8476-201. Applications requiring collector currents exceeding 4.7mA require circuit analysis to confirm compatibility.

Frequently Asked Questions (FAQ)

Q: Can OP550B directly replace SDP8476-201 in existing designs?

A: Yes. Both components share identical wavelength (935nm), voltage rating (30V), dark current (100nA), power rating (100mW), and radial through-hole package configuration. Direct PCB substitution is mechanically and electrically compatible.

Q: What is the significance of the 4.7mA versus 6mA collector current difference?

A: The OP550B maximum collector current is rated at 4.7mA compared to 6mA for SDP8476-201. This difference is relevant only for applications operating at or near maximum collector current. Designs operating below 4.7mA collector current are unaffected. Applications requiring the full 6mA capability require circuit verification.

Q: Does the extended temperature range of OP550B (-40 to 100°C) affect compatibility?

A: No. The extended upper operating temperature of OP550B (100°C versus 85°C) provides additional thermal margin and does not compromise compatibility. Applications operating within the original -40 to 85°C range experience no change in performance.

Q: Are there package or mounting differences between these components?

A: No. Both SDP8476-201 and OP550B use identical radial through-hole package configuration with side-view optical orientation. PCB footprints are directly compatible.

Q: What compliance certifications apply to OP550B?

A: OP550B is ROHS3 compliant and REACH unaffected, meeting current regulatory standards. Both components share identical Moisture Sensitivity Level 1 (Unlimited) classification.

Q: Why is SDP8476-201 classified as obsolete?

A: Obsolete status indicates the manufacturer (Honeywell) has discontinued production. OP550B provides an active equivalent from TT Electronics / Optek Technology, ensuring continued availability for new designs and legacy system support.

Q: Are there viewing angle differences between these sensors?

A: The SDP8476-201 specifies a 20° viewing angle. The OP550B viewing angle is not specified in available parameters. For applications where viewing angle is a critical design parameter, optical performance verification is required.

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