SD5491-003 Equivalent & Substitute Parts Reference

Part Overview

The SD5491-003 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 880nm infrared detection in a TO-206AA (TO-18-3 Metal Can) through-hole package with top-view orientation. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The sensor operates across an extended temperature range of -55°C to 125°C and features a 12° viewing angle with 150mW maximum power dissipation.

Substiute Parts

SD5491-003

Honeywell Sensing and Productivity SolutionsIn Stock: 758SD5491-003 Datasheet

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MTD8600N4-T

Marktech OptoelectronicsIn Stock: 900MTD8600N4-T Datasheet

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OP800A

TT Electronics / Optek TechnologyIn Stock: 1398OP800A Datasheet

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OP800B

TT Electronics/Optek TechnologyIn Stock: 930OP800B Datasheet

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OP800C

TT Electronics / Optek TechnologyIn Stock: 847OP800C Datasheet

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OP804SL

TT Electronics/Optek TechnologyIn Stock: 2733OP804SL Datasheet

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OP804TX

TT Electronics/Optek TechnologyIn Stock: 776OP804TX Datasheet

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OP804TXV

TT Electronics/Optek TechnologyIn Stock: 972OP804TXV Datasheet

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OP805SL

TT Electronics/Optek TechnologyIn Stock: 1618OP805SL Datasheet

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OP805TX

TT Electronics/Optek TechnologyIn Stock: 1146OP805TX Datasheet

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OP805TXV

TT Electronics/Optek TechnologyIn Stock: 1455OP805TXV Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD5491-003 is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: TO-206AA, TO-18-3 Metal Can (physical and electrical compatibility)
• Mounting Type: Through Hole (assembly process compatibility)
• Orientation: Top View (optical axis alignment)
• Voltage - Collector Emitter Breakdown (Max): 30V (circuit protection requirement)
• Current - Dark (Id) (Max): 100nA (leakage specification)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (storage and handling compatibility)

Allowable Variation Parameters:

• Wavelength: 880nm (primary) to 890nm (near-infrared spectrum, functionally equivalent for most applications)
• Viewing Angle: 12° to 24° (wider angles remain compatible with 12° requirement)
• Power - Max: 150mW (minimum) to 250mW (higher ratings provide design margin)
• Operating Temperature: -55°C to 125°C (minimum) to -65°C to 125°C (extended lower temperature capability)
• Current - Collector (Ic) (Max): Not specified in main part; substitute parts rated at 50mA
• Product Status: Active substitutes preferred over obsolete main part

All substitute parts listed maintain electrical and mechanical compatibility within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitution Tier (Exact Wavelength Match):

The MTD8600N4-T from Marktech Optoelectronics maintains the 880nm wavelength specification of the SD5491-003. This part is active in production status and provides enhanced power dissipation (250mW vs. 150mW). However, the operating temperature range is narrower (-30°C to 100°C vs. -55°C to 125°C), which may limit applicability in extended temperature environments. This substitute is suitable for applications operating within the -30°C to 100°C window.

Secondary Substitution Tier (Near-Infrared Wavelength, 890nm):

The OP800 series (OP800A, OP800B, OP800C) and OP804/OP805 series from TT Electronics / Optek Technology operate at 890nm, representing a 10nm wavelength shift from the primary specification. All these parts maintain active production status, ROHS3 compliance, and extended operating temperature ranges (-65°C to 125°C). The OP804TX, OP804TXV, OP805TX, and OP805TXV variants feature 24° viewing angles, providing wider optical acceptance compared to the SD5491-003's 12° specification. The OP804SL and OP805SL variants do not specify viewing angle data.

Compliance and Certification Status:

All substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with modern manufacturing and storage protocols. The substitute parts from TT Electronics / Optek Technology include REACH Unaffected status, providing additional regulatory assurance.

Inventory Availability:

OP804SL demonstrates the highest inventory availability (2,713 pcs), followed by OP800A (1,329 pcs) and OP805SL (1,590 pcs), supporting production continuity requirements.

Frequently Asked Questions (FAQ)

Q: Can the OP804TX or OP805TXV be used as direct replacements for the SD5491-003?

A: Yes, with wavelength consideration. The OP804TX and OP805TXV are electrically and mechanically compatible, maintaining identical package (TO-206AA), mounting type (through-hole), orientation (top view), voltage rating (30V), and dark current specification (100nA). The 890nm wavelength differs from the 880nm specification by 10nm. The 24° viewing angle exceeds the 12° requirement, providing wider optical acceptance. Operating temperature extends to -65°C, exceeding the -55°C minimum. These parts are active in production.

Q: What is the significance of the wavelength difference between 880nm and 890nm?

A: Both wavelengths fall within the near-infrared spectrum and are commonly used for phototransistor applications. The 10nm difference represents approximately 1.1% of the primary wavelength. Compatibility depends on the specific optical filter or light source in the application. Applications using 880nm LEDs or filters may experience reduced responsivity with 890nm sensors. Applications using broadband infrared sources or wavelength-agnostic designs typically accommodate both specifications.

Q: Why do some substitute parts (OP800A, OP800B, OP800C, OP804SL, OP805SL) not specify viewing angle?

A: The viewing angle parameter is not provided in the input data for these specific part numbers. This does not indicate incompatibility; it reflects incomplete specification data. Viewing angle is an optical characteristic that does not affect electrical substitution eligibility. Parts without specified viewing angle data maintain all mandatory electrical and mechanical compatibility parameters.

Q: Is the MTD8600N4-T suitable for applications requiring the full -55°C to 125°C temperature range?

A: No. The MTD8600N4-T operates from -30°C to 100°C, which does not cover the full -55°C to 125°C range of the SD5491-003. This substitute is suitable only for applications operating within the -30°C to 100°C window. For applications requiring extended low-temperature operation below -30°C or high-temperature operation above 100°C, the TT Electronics / Optek Technology OP800 and OP804/OP805 series are required, as they support -65°C to 125°C operation.

Q: What is the advantage of the higher power rating (250mW vs. 150mW) in substitute parts?

A: The higher power rating provides increased thermal dissipation capability, allowing the component to operate at higher collector currents or in higher ambient temperature environments without thermal stress. This represents a design margin improvement over the original SD5491-003 specification and does not create compatibility issues in circuits designed for 150mW operation.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SD5491-003 is RoHS Compliant. All substitute parts listed are either RoHS Compliant or ROHS3 Compliant, maintaining environmental regulatory compatibility. ROHS3 represents an updated compliance standard and is fully compatible with RoHS requirements.

Q: Which substitute part offers the best inventory availability?

A: The OP804SL from TT Electronics / Optek Technology offers the highest inventory availability at 2,713 pieces in stock, followed by OP805SL at 1,590 pieces and OP800A at 1,329 pieces. These parts support immediate production requirements without supply constraints.