Equivalent & Substitute Parts for SD5491-005

Part Overview

The SD5491-005 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 880nm infrared detection in a TO-206AA metal can package with top view orientation. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. 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.

Key Parameters

Parameter	SD5491-005 Value
Wavelength	880nm
Package / Case	TO-206AA, TO-18-3 Metal Can
Orientation	Top View
Mounting Type	Through Hole
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Dark (Id) (Max)	100 nA
Power - Max	150 mW
Operating Temperature	-55°C ~ 125°C
Viewing Angle	12°
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SD5491-005 is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: TO-206AA, TO-18-3 Metal Can (mechanical and electrical interface requirement)
Mounting Type: Through Hole (PCB assembly compatibility)
Orientation: Top View (optical axis alignment)
Voltage - Collector Emitter Breakdown (Max): 30 V (electrical stress rating)
Current - Dark (Id) (Max): 100 nA (leakage current specification)

Secondary Compatibility Criteria:

Wavelength: 880nm or 890nm (infrared detection band)
Operating Temperature Range: Must encompass or exceed -55°C to 125°C
Power - Max: Must equal or exceed 150 mW
RoHS Compliance: ROHS3 or equivalent compliance status

All substitute parts listed maintain identical mechanical packaging, electrical stress ratings, and dark current specifications. Wavelength variations between 880nm and 890nm remain within the near-infrared spectrum and are functionally compatible for most applications utilizing this sensor category. Substitute parts feature enhanced power dissipation (250mW) and improved collector current ratings (50mA), providing design margin improvements over the original component.

Parameter Comparison

Part Number	Manufacturer	Wavelength	Package	Orientation	Voltage - VCE(BR) Max	Current - Id Max	Power - Max	Operating Temp	Viewing Angle	Product Status	RoHS Status
SD5491-005	Honeywell Sensing and Productivity Solutions	880nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	150 mW	-55°C ~ 125°C	12°	Obsolete	RoHS Compliant
MTD8600N4-T	Marktech Optoelectronics	880nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-30°C ~ 100°C	24°	Active	ROHS3 Compliant
OP800A	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	Not specified	Active	ROHS3 Compliant
OP800B	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	Not specified	Active	ROHS3 Compliant
OP800C	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	Not specified	Active	ROHS3 Compliant
OP804SL	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	Not specified	Active	ROHS3 Compliant
OP804TX	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	24°	Active	ROHS3 Compliant
OP804TXV	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	24°	Active	ROHS3 Compliant
OP805SL	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	Not specified	Active	ROHS3 Compliant
OP805TX	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	24°	Active	ROHS3 Compliant
OP805TXV	TT Electronics / Optek Technology	890nm	TO-206AA, TO-18-3 Metal Can	Top View	30 V	100 nA	250 mW	-65°C ~ 125°C	24°	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the SD5491-005 through identical package specifications, voltage ratings, and dark current characteristics. The substitute parts are classified as active products with current manufacturing status, ensuring long-term availability and supply chain stability compared to the obsolete SD5491-005.

Compliance Status: All substitute parts carry ROHS3 compliance certification, meeting current regulatory requirements for electronic component manufacturing and environmental standards. The original SD5491-005 carries RoHS Compliant status, which is superseded by the ROHS3 certification of all substitute options.

Wavelength Consideration: The MTD8600N4-T maintains the original 880nm wavelength specification, providing direct spectral equivalence. All TT Electronics / Optek Technology parts operate at 890nm, representing a 10nm shift within the near-infrared detection band. This wavelength variation remains within acceptable tolerance for phototransistor applications utilizing the 880-890nm spectral window.

Temperature Range: The OP800 and OP804/OP805 series from TT Electronics / Optek Technology extend the lower operating temperature limit to -65°C, exceeding the original -55°C specification. The MTD8600N4-T operates within -30°C to 100°C, which narrows the upper temperature limit by 25°C compared to the original specification.

Power Dissipation: All substitute parts feature 250mW maximum power dissipation, compared to the original 150mW rating, providing enhanced thermal margin and design flexibility.

Viewing Angle: The MTD8600N4-T and specific TT Electronics variants (OP804TX, OP804TXV, OP805TX, OP805TXV) specify 24° viewing angles, compared to the original 12° specification. Parts without specified viewing angle data (OP800A, OP800B, OP800C, OP804SL, OP805SL) maintain compatibility through identical package geometry and optical axis orientation.

Frequently Asked Questions (FAQ)

Q: Can the MTD8600N4-T directly replace the SD5491-005 in all applications?

A: The MTD8600N4-T maintains identical package, orientation, voltage rating, and dark current specifications. The 880nm wavelength matches the original specification exactly. However, the operating temperature range is -30°C to 100°C, which is narrower than the original -55°C to 125°C range. Applications requiring operation below -30°C or above 100°C require alternative selections from the TT Electronics / Optek Technology series.

Q: What is the difference between the OP800 series and OP804/OP805 series?

A: All parts maintain identical electrical specifications (30V VCE(BR), 100nA dark current, 890nm wavelength, 250mW power). The primary differences are in base product numbering and viewing angle specifications. OP804TX, OP804TXV, OP805TX, and OP805TXV specify 24° viewing angles. OP800A, OP800B, OP800C, OP804SL, and OP805SL do not specify viewing angle values in the provided data.

Q: Are the 890nm wavelength parts compatible with 880nm applications?

A: The 10nm wavelength difference between 880nm and 890nm falls within the near-infrared detection band. Both wavelengths are functionally compatible for phototransistor applications in this spectral region. Applications with specific wavelength-dependent filtering or spectral response requirements should evaluate the detailed spectral response curves of candidate parts.

Q: What is the significance of the "TX" and "TXV" designations in the part numbers?

A: The provided data does not include specifications distinguishing TX and TXV variants beyond part numbering. Both designations appear across the OP804 and OP805 base product families with identical electrical parameters and 24° viewing angle specifications.

Q: Which substitute part offers the widest operating temperature range?

A: The OP800A, OP800B, OP800C, OP804TX, OP804TXV, OP805SL, OP805TX, and OP805TXV all operate across -65°C to 125°C, extending the lower temperature limit by 10°C below the original SD5491-005 specification of -55°C to 125°C.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts carry ROHS3 compliance certification. The original SD5491-005 carries RoHS Compliant status. ROHS3 represents the current regulatory standard for electronic component manufacturing.

Q: Can I use substitute parts with different viewing angles interchangeably?

A: The viewing angle specification affects the optical field of view. The original SD5491-005 specifies 12°, while certain substitute parts specify 24°. Parts with wider viewing angles (24°) will detect infrared radiation across a broader angular range. Application-specific optical design requirements determine whether viewing angle differences are acceptable.

Q: What inventory availability should I consider for long-term supply?

A: The provided data indicates current inventory levels for each part. The OP804SL maintains the highest inventory at 2,713 pieces. All substitute parts are classified as active products with current manufacturing status, supporting ongoing availability beyond current stock levels.

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