SD3443-002 Equivalent & Substitute Parts Reference

Part Overview

The SD3443-002 is an 880nm phototransistor 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, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a wide temperature range of -55°C to 125°C and is RoHS compliant with unlimited moisture sensitivity rating.

Substiute Parts

SD3443-002

Honeywell Sensing and Productivity SolutionsIn Stock: 853SD3443-002 Datasheet

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MTD8600T4-T

Marktech OptoelectronicsIn Stock: 877MTD8600T4-T Datasheet

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OP801WSL

TT Electronics/Optek TechnologyIn Stock: 1907OP801WSL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD3443-002 is determined by the following critical parameters:

Primary Matching Criteria:

• Wavelength: 880nm or 890nm (near-infrared spectrum compatibility)
• Voltage - Collector Emitter Breakdown: 30 V (electrical rating match)
• Current - Dark (Id): 100 nA (leakage current specification)
• Mounting Type: Through Hole (mechanical compatibility)
• Orientation: Top View (optical axis alignment)
• Package Type: Metal Can (thermal and mechanical housing)

Secondary Compatibility Factors:

• Operating Temperature Range (must encompass or match application requirements)
• Power Dissipation Rating (must meet or exceed 150 mW minimum)
• RoHS Compliance Status (regulatory requirement)
• Moisture Sensitivity Level (handling and storage compatibility)

The substitute parts identified (MTD8600T4-T and OP801WSL) share the core electrical specifications and through-hole metal can packaging. Both operate at the same collector-emitter breakdown voltage and dark current specifications. Wavelength variations (880nm vs 890nm) remain within the near-infrared detection band and are functionally compatible for most phototransistor applications.

Parameter Comparison

Engineering Selection Recommendations

MTD8600T4-T (Marktech Optoelectronics): This substitute maintains exact wavelength (880nm) and electrical specifications (30 V breakdown, 100 nA dark current) as the SD3443-002. The part is in active production status with RoHS compliance certification. Power dissipation capability is increased to 250 mW, providing design margin. Operating temperature range (-30°C to 100°C) is narrower than the original part; applications requiring operation below -30°C or above 100°C require thermal analysis. Package transition from TO-46-3 to TO-206AA/TO-18-3 metal can requires PCB layout verification for mechanical fit and thermal performance.

OP801WSL (TT Electronics/Optek Technology): This substitute operates at 890nm wavelength, a 10nm offset from the SD3443-002 specification. Electrical ratings remain identical (30 V breakdown, 100 nA dark current). The part is in active production with ROHS3 compliance. Operating temperature range (-65°C to 125°C) exceeds the original specification, supporting extended low-temperature applications. Power dissipation is rated at 250 mW. Package configuration (TO-206AA/TO-18-3 metal can) requires mechanical compatibility verification. The wavelength difference (890nm vs 880nm) is within typical near-infrared detector tolerance bands and is compatible with standard 880nm LED sources used in industrial sensing applications.

Product Status Consideration: Both substitute parts are in active production status, ensuring long-term availability and supply chain stability compared to the obsolete SD3443-002.

Frequently Asked Questions (FAQ)

Q: Can MTD8600T4-T and OP801WSL be used interchangeably with SD3443-002?

A: Both parts share the critical electrical specifications (30 V breakdown voltage, 100 nA dark current, through-hole metal can packaging, top view orientation). Substitution is valid when the application does not require the exact 880nm wavelength specification. MTD8600T4-T maintains 880nm wavelength matching. OP801WSL operates at 890nm and is suitable for applications using standard near-infrared detection bands. Package mechanical differences (TO-46-3 vs TO-206AA/TO-18-3) require PCB layout verification.

Q: What are the temperature range implications for substitution?

A: The SD3443-002 operates from -55°C to 125°C. MTD8600T4-T operates from -30°C to 100°C, which is narrower at both extremes. OP801WSL operates from -65°C to 125°C, which exceeds the original specification at the low end. For applications requiring operation below -30°C, OP801WSL is the appropriate selection. For applications limited to -30°C to 100°C, MTD8600T4-T is acceptable.

Q: Does the wavelength difference between 880nm and 890nm affect system performance?

A: The 10nm difference between SD3443-002 (880nm) and OP801WSL (890nm) represents a 1.1% spectral shift. Both wavelengths fall within the near-infrared detection band used in industrial sensing, optical isolation, and proximity detection applications. Standard 880nm LED sources will activate both phototransistors. Wavelength-critical applications (such as narrow-band optical filtering) require MTD8600T4-T for exact 880nm matching.

Q: Are there mechanical compatibility issues with package transitions?

A: The SD3443-002 uses TO-46-3 metal can packaging. Both substitutes (MTD8600T4-T and OP801WSL) use TO-206AA or TO-18-3 metal can packages. While all are through-hole metal can designs, physical dimensions may differ. PCB footprint verification is required before substitution. Lead spacing, can diameter, and mounting hole alignment must be confirmed against component datasheets and PCB design files.

Q: What is the compliance status of substitute parts?

A: MTD8600T4-T is RoHS Compliant. OP801WSL is ROHS3 Compliant, representing the current RoHS directive revision. Both parts have unlimited moisture sensitivity level (MSL 1), matching the original SD3443-002. Both are classified under ECCN EAR99 and HTSUS 8541.49.7080, consistent with the original part's regulatory classification.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring exact 880nm wavelength specification and active production status, MTD8600T4-T is the primary selection. For applications requiring extended low-temperature operation (-65°C capability) or where 890nm wavelength is acceptable, OP801WSL is appropriate. Both parts offer increased power dissipation (250 mW vs 150 mW), providing design margin for thermal management.