SL5501W Equivalent & Substitute Parts

Part Overview

The SL5501W is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 5300Vrms isolation rating. This component features a single-channel configuration in a 6-DIP package and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for system redesign, legacy product support, and procurement continuity.

Substiute Parts

SL5501W

onsemiIn Stock: 5485SL5501W Datasheet

Current PartRFQ

4N28

onsemiIn Stock: 251854N28 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SL5501W is determined by the following critical parameters:

• Isolation Voltage: 5300Vrms minimum requirement
• Output Configuration: Transistor with base output
• Number of Channels: Single channel
• Package Type: 6-DIP through-hole mounting
• Operating Temperature Range: -55°C to 100°C
• Output Voltage Rating: 30V maximum
• Output Current Capability: 100mA per channel

The 4N28 qualifies as a substitute part because it maintains the same isolation voltage (5300Vrms), output type (transistor with base), channel count (1), operating temperature range (-55°C to 100°C), output voltage rating (30V), and through-hole 6-DIP package configuration. While the 4N28 exhibits different Current Transfer Ratio specifications and Vce saturation characteristics, these variations remain within acceptable tolerance for equivalent functionality in isolation applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SL5501W and 4N28 are classified as obsolete products. Selection between these parts should be based on:

Compliance and Regulatory Status: Both parts maintain REACH Unaffected status and EAR99 ECCN classification, ensuring equivalent regulatory compliance for export and use.

Package Footprint Consideration: The SL5501W uses a 6-DIP package with 0.400" (10.16mm) pitch, while the 4N28 uses a 6-DIP package with 0.300" (7.62mm) pitch. PCB layout compatibility must be verified before substitution.

Electrical Performance Variance: The 4N28 exhibits a lower minimum Current Transfer Ratio (10% versus 25%) and higher Vce saturation (500mV versus 400mV). Circuit designs dependent on the higher current transfer ratio or lower saturation voltage of the SL5501W require performance validation with the 4N28.

Availability and Inventory: Procurement decisions should account for current stock levels and lead times from authorized distributors.

Frequently Asked Questions (FAQ)

Q: Can the 4N28 directly replace the SL5501W without PCB modification?

A: Direct replacement depends on PCB layout. The 4N28 uses a 0.300" (7.62mm) DIP pitch compared to the SL5501W's 0.400" (10.16mm) pitch. Physical footprint compatibility must be confirmed before substitution. If the PCB is designed for the SL5501W's larger pitch, mechanical adaptation or PCB redesign may be required.

Q: What are the key electrical differences between these parts?

A: The 4N28 has a lower minimum Current Transfer Ratio (10% @ 10mA versus 25% @ 10mA) and higher Vce saturation voltage (500mV versus 400mV). Applications requiring the higher current transfer ratio or lower saturation characteristics of the SL5501W should undergo electrical performance testing with the 4N28 to confirm suitability.

Q: Are both parts suitable for new designs?

A: Both the SL5501W and 4N28 are classified as obsolete. Neither part is recommended for new designs. Current-generation optoisolator alternatives from onsemi or other manufacturers should be evaluated for new product development.

Q: Do these parts have identical isolation voltage ratings?

A: Yes. Both the SL5501W and 4N28 provide 5300Vrms isolation voltage, meeting equivalent high-voltage isolation requirements.

Q: What compliance certifications apply to both parts?

A: Both parts maintain REACH Unaffected status and are classified under ECCN EAR99, ensuring equivalent regulatory compliance for industrial and commercial applications.