SDP8475-201 Equivalent & Substitute Parts

Part Overview

The SDP8475-201 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm infrared detection with top view radial packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The sensor operates across industrial temperature ranges (-40°C to 85°C) and is RoHS compliant, suitable for applications requiring near-infrared photodetection in through-hole mounting configurations.

Substiute Parts

SDP8475-201

Honeywell Sensing and Productivity SolutionsIn Stock: 765SDP8475-201 Datasheet

Current PartRFQ

LTR-3208

Lite-On Inc.In Stock: 12558LTR-3208 Datasheet

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OP505A

TT Electronics / Optek TechnologyIn Stock: 1868OP505A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SDP8475-201 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Wavelength range: 935nm to 940nm (near-infrared spectrum compatibility)
• Voltage rating: 30 V Collector-Emitter Breakdown minimum
• Dark current: 100 nA maximum
• Mounting type: Through Hole
• Orientation: Top View
• Operating temperature range: Minimum -40°C to 85°C coverage
• Moisture Sensitivity Level: 1 (Unlimited)

Secondary Considerations:

• Package form factor (Radial vs. T-1 variants acceptable for through-hole applications)
• Power dissipation capability (70 mW minimum)
• Product status (Active status preferred for long-term availability)
• Regulatory compliance (RoHS3 compliance maintains environmental standards)

The two identified substitutes meet these criteria with minor variations in wavelength (940nm vs. 935nm) and package geometry, both acceptable within optical sensor application tolerances.

Parameter Comparison

Engineering Selection Recommendations

LTR-3208 (Lite-On Inc.): This substitute maintains identical electrical specifications to the SDP8475-201 with 30 V breakdown voltage, 100 nA dark current, and 20° viewing angle. The wavelength shift from 935nm to 940nm represents a 5nm variation within the near-infrared spectrum, acceptable for most photodetection applications. The LTR-3208 offers increased power dissipation (100 mW vs. 70 mW) and active product status with ROHS3 compliance. Radial package geometry matches the original form factor. High inventory availability (12,530 units) supports production requirements.

OP505A (TT Electronics / Optek Technology): This substitute provides exact wavelength matching at 935nm with identical electrical parameters (30 V breakdown, 100 nA dark current). The OP505A extends operating temperature range to 100°C, exceeding the original specification. Power dissipation increases to 100 mW. Active product status and ROHS3 compliance ensure regulatory alignment. The T-1 package geometry differs from the radial form factor; mechanical integration requires verification for PCB layout compatibility. Inventory availability (1,800 units) is adequate for moderate production volumes.

Both substitutes satisfy the core electrical and environmental requirements. Selection depends on package geometry constraints and wavelength sensitivity requirements of the specific application.

Frequently Asked Questions (FAQ)

Q: Can the LTR-3208 replace the SDP8475-201 in existing designs?

A: Yes. The LTR-3208 maintains identical voltage ratings (30 V), dark current specifications (100 nA), viewing angle (20°), and operating temperature range (-40°C to 85°C). The 5nm wavelength difference (940nm vs. 935nm) falls within acceptable near-infrared detection tolerances for most applications. Radial package geometry provides direct mechanical compatibility.

Q: What is the primary difference between the OP505A and LTR-3208?

A: The OP505A matches the original 935nm wavelength exactly, while the LTR-3208 operates at 940nm. The OP505A uses T-1 package geometry versus the radial form factor of both the original and LTR-3208. The OP505A supports extended temperature operation to 100°C. Package selection depends on PCB layout requirements and wavelength sensitivity.

Q: Are both substitutes RoHS compliant?

A: Yes. Both the LTR-3208 and OP505A carry ROHS3 compliance certification, meeting current environmental regulations. The original SDP8475-201 is RoHS compliant. All three components maintain Moisture Sensitivity Level 1 (Unlimited).

Q: Why is the SDP8475-201 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts with active product status (LTR-3208 and OP505A) ensure long-term component availability and supply chain continuity for new designs and system maintenance.

Q: Can the OP505A be used in applications requiring the exact radial package?

A: No. The OP505A uses T-1 package geometry, which differs mechanically from the radial form factor. For applications requiring radial packaging, the LTR-3208 is the appropriate substitute. The OP505A requires PCB layout modification to accommodate T-1 lead configuration.

Q: What inventory considerations apply to these substitutes?

A: The LTR-3208 offers the highest inventory availability (12,530 units), supporting large production volumes. The OP505A provides adequate stock (1,800 units) for moderate requirements. Both maintain active product status, ensuring continued availability beyond current inventory levels.