SD3443-003 Equivalent & Substitute Parts Reference

Part Overview

The SD3443-003 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, housed 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 for ongoing design requirements and production continuity. The part operates across an extended temperature range of -55°C to 125°C and features a 90° viewing angle with maximum collector current of 2 mA and dark current specification of 100 nA.

Key Parameters

Parameter	SD3443-003 Value
Manufacturer	Honeywell Sensing and Productivity Solutions
Category	Optical Sensors
Product Type	Phototransistor
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	2 mA
Current - Dark (Id) (Max)	100 nA
Viewing Angle	90°
Power - Max	150 mW
Mounting Type	Through Hole
Orientation	Top View
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	TO-46-3 Metal Can
Product Status	Obsolete
RoHS Status	RoHS Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SD3443-003 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Collector Emitter Breakdown: 30 V (all substitutes match)
Current - Dark (Id) (Max): 100 nA (all substitutes match)
Mounting Type: Through Hole (all substitutes match)
Orientation: Top View (all substitutes match)
RoHS Compliance: Required (all substitutes comply)
MSL Rating: 1 (Unlimited) (all substitutes match)

Allowable Variation Parameters:

Current - Collector (Ic) (Max): Substitutes may exceed the 2 mA specification (50 mA available in alternatives)
Power - Max: Substitutes may exceed the 150 mW specification (250 mW available in alternatives)
Viewing Angle: Substitutes may differ from 90° (110° available in alternatives)
Operating Temperature: Substitutes must maintain or extend the -55°C to 125°C range
Package / Case: Substitutes use TO-18-2, TO-18-3, or TO-206AA metal can packages (compatible through-hole alternatives)
Wavelength: Substitutes operate at 880 nm or 890 nm (not specified in main part)

All four substitute parts meet the mandatory electrical and mechanical compatibility criteria for direct substitution.

Parameter Comparison

Parameter	SD3443-003	MTD8600T-T	MTD8600T4-T	OP801WSL	OP802WSL
Manufacturer	Honeywell	Marktech Optoelectronics	Marktech Optoelectronics	TT Electronics/Optek	TT Electronics/Optek
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	30 V	30 V	30 V
Current - Collector (Ic) (Max)	2 mA	50 mA	50 mA	50 mA	50 mA
Current - Dark (Id) (Max)	100 nA	100 nA	100 nA	100 nA	100 nA
Wavelength	Not specified	880 nm	880 nm	890 nm	890 nm
Viewing Angle	90°	110°	110°	Not specified	Not specified
Power - Max	150 mW	250 mW	250 mW	250 mW	250 mW
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Orientation	Top View	Top View	Top View	Top View	Top View
Operating Temperature	-55°C ~ 125°C	-30°C ~ 100°C	-30°C ~ 100°C	-65°C ~ 125°C	-65°C ~ 125°C
Package / Case	TO-46-3 Metal Can	TO-18-2 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can	TO-206AA, TO-18-3 Metal Can
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

OP802WSL (TT Electronics/Optek Technology) is the primary substitute selection based on the following criteria:

Active product status with highest inventory availability (12,923 pcs)
ROHS3 compliance exceeds RoHS requirements
Operating temperature range of -65°C to 125°C extends beyond the original -55°C to 125°C specification
Electrical parameters (30 V breakdown, 100 nA dark current) match exactly
Through-hole TO-206AA/TO-18-3 metal can package provides direct mechanical compatibility
890 nm wavelength specification provides defined optical performance

OP801WSL (TT Electronics/Optek Technology) serves as a secondary substitute with identical electrical and thermal specifications to OP802WSL, with inventory of 1,821 pcs.

MTD8600T4-T (Marktech Optoelectronics) provides an alternative with 768 pcs inventory, offering TO-206AA/TO-18-3 package compatibility and 880 nm wavelength specification. Operating temperature range of -30°C to 100°C is narrower than the original specification.

MTD8600T-T (Marktech Optoelectronics) offers 1,140 pcs inventory with TO-18-2 package. Operating temperature range of -30°C to 100°C is narrower than the original specification.

All four substitutes are electrically compatible. Selection should prioritize application-specific temperature requirements and package footprint constraints.

Frequently Asked Questions (FAQ)

Q: Can OP802WSL directly replace SD3443-003 in existing designs?

A: OP802WSL meets all mandatory electrical parameters (30 V breakdown voltage, 100 nA dark current) and mechanical requirements (through-hole, top view orientation, metal can package). The TO-206AA/TO-18-3 package is mechanically compatible with through-hole PCB layouts. Verification of PCB footprint compatibility is required before implementation.

Q: Why do substitute parts have higher maximum collector current (50 mA vs. 2 mA)?

A: Higher maximum current ratings indicate greater current-handling capability. This parameter is allowable to exceed in substitution because the application circuit determines actual operating current. The substitute parts will operate safely at the original 2 mA design current.

Q: What is the significance of the 890 nm wavelength in OP801WSL and OP802WSL?

A: The 890 nm wavelength specification indicates the peak spectral response of the phototransistor. The original SD3443-003 does not specify wavelength. OP801WSL and OP802WSL are optimized for 890 nm infrared detection. MTD8600T and MTD8600T4-T operate at 880 nm. Selection depends on the light source wavelength in the application.

Q: Are there temperature limitations when substituting with MTD8600 series parts?

A: MTD8600T-T and MTD8600T4-T operate across -30°C to 100°C, which is narrower than the original -55°C to 125°C range. These substitutes are not suitable for applications requiring operation below -30°C or above 100°C. OP801WSL and OP802WSL maintain the full -65°C to 125°C range.

Q: What is the difference between TO-18-2 and TO-206AA packages?

A: Both are through-hole metal can packages for phototransistors. TO-18-2 is a 2-lead configuration (MTD8600T-T), while TO-206AA and TO-18-3 are 3-lead configurations (MTD8600T4-T, OP801WSL, OP802WSL). PCB footprint compatibility must be verified for the specific package selected.

Q: Why is OP802WSL recommended over OP801WSL?

A: Both parts are electrically and thermally identical. OP802WSL is recommended based on significantly higher inventory availability (12,923 pcs vs. 1,821 pcs), ensuring supply continuity and potentially better lead times.

Q: Are all substitutes RoHS compliant?

A: Yes. SD3443-003 is RoHS Compliant. MTD8600T-T and MTD8600T4-T are RoHS Compliant. OP801WSL and OP802WSL are ROHS3 Compliant, which exceeds RoHS requirements and is fully compatible with RoHS-regulated applications.

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