SDP8405-002 Equivalent & Substitute Parts

Part Overview

The SDP8405-002 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm infrared detection applications. This component features a top-view radial package (3mm diameter, T-1 form factor) and is rated for through-hole mounting in electronic assemblies requiring photoelectric sensing.

The SDP8405-002 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this sensor.

Substiute Parts

SDP8405-002

Honeywell Sensing and Productivity SolutionsIn Stock: 921SDP8405-002 Datasheet

Current PartRFQ

OP505A

TT Electronics / Optek TechnologyIn Stock: 1868OP505A Datasheet

SimilarRFQ

QSD124

onsemiIn Stock: 13673QSD124 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SDP8405-002 is determined by the following critical parameters:

Primary Matching Criteria:

• Wavelength sensitivity (935nm or compatible infrared spectrum)
• Voltage rating (Collector-Emitter breakdown minimum 30V)
• Dark current specification (100 nA maximum)
• Mounting type (Through Hole)
• Orientation (Top View)
• Operating temperature range compatibility

Secondary Compatibility Factors:

• Current-handling capacity (Ic rating)
• Power dissipation rating
• Package form factor (T-1 radial preferred for mechanical fit)
• Viewing angle tolerance

Two substitute parts are identified based on these parameters:

OP505A (TT Electronics / Optek Technology): Matches wavelength (935nm), voltage rating (30V), dark current (100 nA), mounting type (Through Hole), orientation (Top View), and operating temperature range (-40°C to 100°C). Product status is Active. Package is T-1 form factor.

QSD124 (onsemi): Matches voltage rating (30V), dark current (100 nA), mounting type (Through Hole), and orientation (Top View). Wavelength is 880nm (near-infrared, adjacent spectrum). Operating temperature range is -40°C to 100°C. Package is Radial, 5mm diameter (T 1 3/4).

Parameter Comparison

Engineering Selection Recommendations

OP505A Selection Criteria:

The OP505A is the primary substitute for the SDP8405-002. Both components share identical wavelength (935nm), voltage rating (30V), and dark current specification (100 nA). The OP505A is classified as Active product status, ensuring ongoing availability and supply chain support. The component is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements. Operating temperature range extends to 100°C, providing broader thermal operating envelope than the original part. Current inventory of 1800 units is available. Package form factor is T-1, compatible with through-hole mounting applications designed for the SDP8405-002.

QSD124 Selection Criteria:

The QSD124 is a secondary substitute option when wavelength flexibility is acceptable within system design parameters. The component matches voltage rating (30V), dark current (100 nA), and mounting orientation (Top View, Through Hole). Wavelength is 880nm, representing a 55nm shift toward shorter infrared spectrum compared to the SDP8405-002. The QSD124 is classified as Active product status with ROHS3 Compliance and REACH Unaffected status. Operating temperature range extends to 100°C. Current inventory of 13,652 units is available. Package is Radial, 5mm diameter (T 1 3/4), which differs from the original 3mm T-1 package and requires mechanical design verification for board layout compatibility.

Compliance and Regulatory Status:

Both substitute parts meet current RoHS3 and REACH regulatory requirements, suitable for applications requiring environmental compliance certification. The SDP8405-002, while RoHS Compliant, carries obsolete product status and should be replaced in new designs.

Frequently Asked Questions (FAQ)

Q: Can the OP505A directly replace the SDP8405-002 without circuit modification?

A: The OP505A shares identical wavelength (935nm), voltage rating (30V), and dark current specification (100 nA) with the SDP8405-002. Both are through-hole, top-view phototransistors in T-1 package form factor. Direct substitution is supported from an electrical and mechanical standpoint. Circuit performance depends on application-specific current requirements; the OP505A maximum collector current is 5.95 mA compared to 14 mA for the SDP8405-002.

Q: What is the impact of using QSD124 instead of SDP8405-002?

A: The QSD124 operates at 880nm wavelength, compared to 935nm for the SDP8405-002. This 55nm difference affects infrared spectral response and may impact sensor performance in applications with wavelength-specific requirements. Mechanical compatibility requires verification; the QSD124 package is Radial, 5mm diameter (T 1 3/4), larger than the original 3mm T-1 package. Electrical parameters (voltage, dark current) are compatible.

Q: Are both substitute parts available in current production?

A: Yes. The OP505A is classified as Active product status with 1800 units in current inventory. The QSD124 is classified as Active product status with 13,652 units in current inventory. Both components are manufactured by active suppliers (TT Electronics / Optek Technology and onsemi, respectively).

Q: What are the regulatory compliance differences between the original and substitute parts?

A: The SDP8405-002 is RoHS Compliant. Both substitute parts (OP505A and QSD124) are ROHS3 Compliant, representing updated environmental compliance standards. The OP505A is REACH Unaffected; the QSD124 is REACH Unaffected. All three components carry ECCN EAR99 classification.

Q: How do operating temperature ranges compare?

A: The SDP8405-002 operates from -40°C to 85°C. Both substitute parts extend the upper temperature limit to 100°C, providing 15°C additional thermal headroom. Lower temperature limit remains -40°C across all three components.

Q: What is the significance of the viewing angle specification?

A: The SDP8405-002 specifies 20° viewing angle. The OP505A does not specify viewing angle in available data. The QSD124 specifies 24° viewing angle. Viewing angle determines the angular field of detection for infrared radiation. Applications requiring precise angular response should account for these differences in optical design.

Q: Can the OP505A handle the same power dissipation as the SDP8405-002?

A: The SDP8405-002 is rated for 70 mW maximum power dissipation. The OP505A is rated for 100 mW maximum power dissipation, providing 30 mW additional margin. This represents improved thermal performance in the substitute component.