SD5443-003 Equivalent & Substitute Parts

Part Overview

The SD5443-003 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions in a TO-46-3 metal can package with top view orientation. This component is classified as obsolete, necessitating identification of functionally equivalent active alternatives. The part operates across an extended temperature range of -55°C to 125°C and features a 30 V collector-emitter breakdown voltage with maximum collector current of 8 mA and dark current of 100 nA. Substitute parts must maintain electrical compatibility while accommodating package and performance variations inherent to alternative manufacturers.

Key Parameters

Parameter	SD5443-003 Value	Unit
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	8	mA
Current - Dark (Id) (Max)	100	nA
Viewing Angle	18	°
Power - Max	150	mW
Mounting Type	Through Hole	—
Orientation	Top View	—
Operating Temperature	-55 to 125	°C
Package / Case	TO-46-3 Metal Can	—
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SD5443-003 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Collector Emitter Breakdown (Max): 30 V minimum
Current - Dark (Id) (Max): 100 nA maximum
Mounting Type: Through Hole
Orientation: Top View

Mechanical Compatibility Considerations:

Package / Case: TO-46-3 Metal Can (original); substitute parts utilize TO-206AA or TO-18-3 Metal Can packages, which are mechanically compatible through-hole alternatives
Moisture Sensitivity Level (MSL): 1 (Unlimited) maintained across all substitutes

Performance Parameters:

Current - Collector (Ic) (Max): Substitute parts rated at 50 mA exceed the original 8 mA specification, providing operational margin
Power - Max: Substitute parts rated at 250 mW exceed the original 150 mW specification
Operating Temperature: Substitute parts maintain or exceed the original -55°C to 125°C range
Viewing Angle: Substitute parts with 24° viewing angle exceed the original 18° specification where specified

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment and long-term availability.

Parameter Comparison

Parameter	SD5443-003	MTD8600N4-T	OP800A	OP800B	OP800C	OP804SL	OP804TX	OP804TXV	OP805SL	OP805TX	OP805TXV
Manufacturer	Honeywell	Marktech	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek	TT Electronics / Optek
Voltage - Collector Emitter Breakdown (Max) [V]	30	30	30	30	30	30	30	30	30	30	30
Current - Collector (Ic) (Max) [mA]	8	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
Wavelength	—	880nm	890nm	890nm	890nm	890nm	890nm	890nm	890nm	890nm	890nm
Viewing Angle [°]	18	24	—	—	—	—	24	24	—	24	24
Power - Max [mW]	150	250	250	250	250	250	250	250	250	250	250
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
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
Package / Case	TO-46-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can
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

Primary Substitutes (TT Electronics / Optek Technology):

The OP800 series (OP800A, OP800B, OP800C) and OP804/OP805 series represent the most direct substitutes for the SD5443-003. All TT Electronics / Optek alternatives are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment and sustained supply chain availability. These parts maintain the critical 30 V collector-emitter breakdown voltage and 100 nA dark current specifications while providing enhanced current handling (50 mA) and power dissipation (250 mW) capabilities. Operating temperature range extends to -65°C, exceeding the original -55°C lower limit.

Secondary Substitute (Marktech Optoelectronics):

The MTD8600N4-T from Marktech Optoelectronics meets all critical electrical parameters with 30 V breakdown voltage and 100 nA dark current. This part operates within -30°C to 100°C, which is narrower than the original specification. The MTD8600N4-T is active and ROHS3 compliant, providing an alternative source for applications not requiring the full extended temperature range.

Package Compatibility:

All substitute parts utilize TO-206AA or TO-18-3 metal can packages, which are mechanically compatible through-hole alternatives to the original TO-46-3 package. PCB layout modifications may be required to accommodate package dimensional differences.

Wavelength Consideration:

Substitute parts operate at 880 nm (MTD8600N4-T) or 890 nm (TT Electronics / Optek series), compared to the unspecified wavelength of the original SD5443-003. Application-specific spectral response requirements must be evaluated independently.

Frequently Asked Questions (FAQ)

Q: Can the OP804TX directly replace the SD5443-003 in existing designs?

A: The OP804TX meets all critical electrical specifications (30 V breakdown, 100 nA dark current, through-hole mounting, top view orientation). However, the package transition from TO-46-3 to TO-206AA/TO-18-3 requires PCB layout verification to confirm mechanical fit and lead compatibility.

Q: What is the difference between OP804TX and OP804TXV?

A: Both parts are electrically identical with matching 30 V breakdown voltage, 50 mA collector current, 100 nA dark current, 890 nm wavelength, 24° viewing angle, 250 mW power rating, and -65°C to 125°C operating temperature. The suffix variation indicates different packaging or binning designations from TT Electronics / Optek Technology.

Q: Why do substitute parts have higher collector current ratings (50 mA vs. 8 mA)?

A: The substitute parts are designed for broader application compatibility and provide operational margin above the original specification. Circuit designs utilizing the SD5443-003 at 8 mA maximum will operate within the safe operating area of substitute parts rated at 50 mA.

Q: Is the MTD8600N4-T suitable for applications requiring -55°C operation?

A: No. The MTD8600N4-T operates from -30°C to 100°C, which does not meet the original -55°C lower temperature limit. For applications requiring extended low-temperature operation, TT Electronics / Optek alternatives (OP800A, OP800B, OP800C, OP804 series, OP805 series) rated to -65°C are appropriate.

Q: What viewing angle should be selected for optical alignment?

A: The original SD5443-003 specifies 18° viewing angle. Substitute parts with 24° viewing angle (MTD8600N4-T, OP804TX, OP804TXV, OP805TX, OP805TXV) provide wider acceptance angles. Parts without specified viewing angle (OP800A, OP800B, OP800C, OP804SL, OP805SL) require datasheet consultation for optical performance verification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original SD5443-003 is RoHS Compliant. Both designations satisfy RoHS directive requirements.

Q: What inventory availability exists for substitute parts?

A: Current inventory levels are: OP804SL (2713 pcs), OP805SL (1590 pcs), OP805TXV (1375 pcs), OP800A (1329 pcs), OP805TX (1054 pcs), MTD8600N4-T (828 pcs), OP800C (831 pcs), OP804TX (764 pcs), OP804TXV (939 pcs), OP800B (868 pcs). All parts are new original stock.

Q: Can wavelength differences (880 nm vs. 890 nm) affect circuit performance?

A: Wavelength differences between 880 nm and 890 nm may affect spectral response characteristics depending on the optical source and filter specifications in the application. Application-specific performance validation is required when transitioning between wavelength variants.

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