SD5491-004 Equivalent & Substitute Parts Reference

Part Overview

The SD5491-004 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm infrared detection in a TO-206AA metal can package with top view orientation. This component is classified as obsolete, necessitating identification of functionally equivalent substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain compatibility with through-hole mounting, identical package geometry, and equivalent electrical performance within specified operating parameters.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Wavelength	935nm	nm	Primary detection spectrum; substitutes operate at 880-890nm
Package / Case	TO-206AA, TO-18-3 Metal Can	—	Physical form factor; all substitutes share identical package
Mounting Type	Through Hole	—	PCB assembly method; consistent across all parts
Orientation	Top View	—	Optical axis orientation; maintained in all substitutes
Voltage - Collector Emitter Breakdown (Max)	30	V	Maximum safe operating voltage; identical across all parts
Current - Collector (Ic) (Max)	4	mA	Output current capability; substitutes rated at 50mA
Current - Dark (Id) (Max)	100	nA	Leakage current; identical across all parts
Power - Max	150	mW	Maximum dissipation; substitutes rated at 250mW
Operating Temperature	-55 to 125	°C	Thermal operating range; substitutes vary from -30 to -65°C minimum
Viewing Angle	12	°	Optical acceptance angle; substitutes range from unspecified to 24°
RoHS Status	RoHS Compliant	—	Environmental compliance; substitutes are ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—	Handling requirement; identical across all parts

Substitute Part Grouping Explanation

Substitution logic for SD5491-004 is based on the following criteria derived from provided parameters:

Primary Compatibility Criteria:

Package / Case: TO-206AA, TO-18-3 Metal Can (mandatory match)
Mounting Type: Through Hole (mandatory match)
Orientation: Top View (mandatory match)
Voltage - Collector Emitter Breakdown: 30V (mandatory match)
Current - Dark (Id) (Max): 100nA (mandatory match)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory match)

Secondary Performance Criteria:

Wavelength: 935nm (primary part) vs. 880-890nm (substitutes) — near-infrared spectrum overlap with spectral sensitivity shift
Current - Collector (Ic) (Max): 4mA (primary) vs. 50mA (substitutes) — substitutes provide higher output current capability
Power - Max: 150mW (primary) vs. 250mW (substitutes) — substitutes support higher power dissipation
Operating Temperature: -55 to 125°C (primary) vs. -30 to -65°C minimum (substitutes) — thermal range variations
Viewing Angle: 12° (primary) vs. unspecified or 24° (substitutes) — optical acceptance angle differences

All substitute parts maintain identical electrical breakdown voltage, dark current, package geometry, and environmental compliance classification. Wavelength differences of 45-55nm represent acceptable spectral variation within near-infrared detection applications where sensor responsivity curves overlap.

Parameter Comparison

Parameter	SD5491-004 (Honeywell)	MTD8600N4-T (Marktech)	OP800A (TT Electronics)	OP800B (TT Electronics)	OP800C (TT Electronics)	OP804SL (TT Electronics)	OP804TX (TT Electronics)	OP804TXV (TT Electronics)	OP805SL (TT Electronics)	OP805TX (TT Electronics)	OP805TXV (TT Electronics)
Wavelength (nm)	935	880	890	890	890	890	890	890	890	890	890
Package / Case	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3	TO-206AA, TO-18-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Orientation	Top View	Top View	Top View	Top View	Top View	Top View	Top View	Top View	Top View	Top View	Top View
Voltage - Collector Emitter Breakdown (Max) (V)	30	30	30	30	30	30	30	30	30	30	30
Current - Collector (Ic) (Max) (mA)	4	50	50	50	50	50	50	50	50	50	50
Current - Dark (Id) (Max) (nA)	100	100	100	100	100	100	100	100	100	100	100
Power - Max (mW)	150	250	250	250	250	250	250	250	250	250	250
Operating Temperature (°C)	-55 to 125	-30 to 100	-65 to 125	-65 to 125	-65 to 125	-65 to 125	-65 to 125	-65 to 125	-65 to 125	-65 to 125	-65 to 125
Viewing Angle (°)	12	24	—	—	—	—	24	24	—	24	24
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Product Status Consideration: The SD5491-004 is classified as obsolete. All listed substitute parts maintain active product status, ensuring long-term availability and continued manufacturer support. Selection from active product lines eliminates future obsolescence risk.

Compliance and Certification: All substitute parts are ROHS3 Compliant, meeting current environmental regulations. The primary part carries RoHS Compliant designation. Both compliance levels are acceptable for applications requiring hazardous substance restrictions.

Electrical Performance: All substitute parts maintain the 30V collector-emitter breakdown voltage and 100nA maximum dark current specifications of the primary part. Substitute parts provide enhanced current-handling capability (50mA vs. 4mA) and power dissipation (250mW vs. 150mW), offering design margin improvements without circuit modification requirements.

Thermal Operating Range: TT Electronics OP800 series (OP800A, OP800B, OP800C), OP804 series (OP804SL, OP804TX, OP804TXV), and OP805 series (OP805SL, OP805TX, OP805TXV) support -65 to 125°C operating temperature, exceeding the primary part's -55 to 125°C range. The Marktech MTD8600N4-T operates within -30 to 100°C, which is narrower than the primary part specification.

Spectral Characteristics: Wavelength shift from 935nm to 880-890nm represents a 45-55nm reduction in detection wavelength. This shift occurs within the near-infrared spectrum where phototransistor responsivity curves maintain significant overlap. Applications utilizing 935nm detection must evaluate spectral sensitivity requirements against substitute part responsivity data.

Optical Acceptance Angle: The primary part specifies 12° viewing angle. Substitute parts with specified viewing angles (OP804TX, OP804TXV, OP805TX, OP805TXV) provide 24° acceptance angles, offering wider optical acceptance. Parts without specified viewing angle (OP800A, OP800B, OP800C, OP804SL, OP805SL) require manufacturer datasheet consultation for precise angle specifications.

Inventory Availability: OP804SL (2713 pcs), OP805TXV (1375 pcs), and OP805SL (1590 pcs) demonstrate highest stock levels among substitute options, supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can SD5491-004 be directly replaced with any of the listed substitute parts without circuit modification?

A: Yes, all substitute parts share identical package geometry (TO-206AA, TO-18-3 Metal Can), through-hole mounting, top view orientation, and critical electrical parameters (30V breakdown voltage, 100nA dark current). Direct pin-compatible substitution is supported. However, applications with wavelength-specific requirements must evaluate the 45-55nm spectral shift from 935nm to 880-890nm.

Q: What is the significance of the wavelength difference between SD5491-004 (935nm) and substitute parts (880-890nm)?

A: Wavelength differences reflect detection spectrum variations within the near-infrared region. Phototransistor responsivity curves for 880-890nm and 935nm sensors overlap significantly. Applications using infrared LEDs or light sources at 880-890nm will experience improved coupling efficiency with substitute parts. Applications requiring specific 935nm detection must evaluate whether the spectral shift affects system performance through responsivity curve analysis.

Q: Are all substitute parts suitable for the full operating temperature range of the primary part?

A: TT Electronics OP800, OP804, and OP805 series parts support -65 to 125°C, which exceeds the primary part's -55 to 125°C specification. The Marktech MTD8600N4-T operates within -30 to 100°C, which is narrower than the primary specification. For applications requiring -55°C minimum operation, TT Electronics parts are preferred; MTD8600N4-T is suitable for applications with -30°C minimum requirements.

Q: What is the difference between OP804 and OP805 series parts?

A: Both OP804 and OP805 series maintain identical electrical specifications (30V breakdown, 50mA collector current, 100nA dark current, 890nm wavelength, 250mW power, -65 to 125°C operating range). Differences exist in viewing angle specifications and base product designations. OP804TX, OP804TXV, OP805TX, and OP805TXV specify 24° viewing angles. OP804SL and OP805SL do not specify viewing angle. Selection between series depends on optical acceptance angle requirements for specific applications.

Q: Why do substitute parts have higher maximum collector current (50mA vs. 4mA) and power dissipation (250mW vs. 150mW)?

A: Higher electrical ratings in substitute parts reflect design improvements in phototransistor technology. These enhanced specifications provide greater design margin and allow operation at higher output current levels without exceeding component limits. Existing circuits designed for 4mA output current operation remain fully compatible; the higher ratings do not require circuit modification.

Q: Is the viewing angle specification critical for substitution?

A: Viewing angle affects optical acceptance characteristics. The primary part specifies 12° viewing angle. Substitute parts with 24° viewing angles (OP804TX, OP804TXV, OP805TX, OP805TXV) provide wider optical acceptance, which may improve light collection in applications with divergent light sources. Parts without specified viewing angles require datasheet consultation. For applications with precise optical alignment requirements, viewing angle specifications should be evaluated against system design parameters.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts are ROHS3 Compliant, meeting current environmental regulations for hazardous substance restrictions. The primary part carries RoHS Compliant designation. Both compliance levels satisfy regulatory requirements for electronic component manufacturing and assembly.

Q: Which substitute part offers the best overall compatibility with SD5491-004?

A: TT Electronics OP800C, OP804TX, OP804TXV, OP805TX, and OP805TXV offer optimal compatibility based on provided parameters. These parts maintain identical electrical specifications, support the full -65 to 125°C operating range (exceeding primary part specification), and provide active product status with established manufacturer support. Selection among these options depends on specific viewing angle requirements and application-specific optical acceptance criteria.

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