FSL3276ALRN Equivalent & Substitute Parts

Part Overview

The FSL3276ALRN is an offline switch IC manufactured by onsemi, designed for power management applications in buck, buck-boost, and flyback converter topologies. This component operates at 50kHz switching frequency with integrated protection features including current limiting, overload, over-temperature, and over-voltage protection. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

FSL3276ALRN

onsemiIn Stock: 1049FSL3276ALRN Datasheet

Current PartRFQ

FSL306LRN

onsemiIn Stock: 3876FSL306LRN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The FSL306LRN qualifies as a direct substitute for the FSL3276ALRN based on the following critical parameters:

Matching Parameters:

• Voltage breakdown rating: 650V
• Supply voltage range: 7V ~ 26V
• Start-up voltage: 8V
• Switching frequency: 50kHz
• Package type: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting type: Through Hole
• Fault protection features: Current Limiting, Open Loop, Over Load, Over Temperature, Over Voltage
• Operating temperature range: -40°C ~ 125°C (TJ)
• RoHS compliance: ROHS3 Compliant
• REACH status: REACH Unaffected

Topology Consideration: The FSL306LRN supports Buck and Flyback topologies, while the FSL3276ALRN supports Buck, Buck-Boost, and Flyback topologies. For applications utilizing Buck or Flyback configurations, the FSL306LRN provides full compatibility.

Parameter Comparison

Engineering Selection Recommendations

The FSL306LRN is the designated substitute for the obsolete FSL3276ALRN. Selection of the FSL306LRN is supported by:

• Active product status, ensuring long-term availability and manufacturing support
• Identical electrical specifications across all critical parameters: voltage ratings, switching frequency, protection features, and operating temperature range
• Identical package and mounting configuration, enabling direct PCB compatibility without layout modifications
• Full RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements
• Higher power rating (7W versus 2.4W), providing design margin for thermal and power delivery considerations

For applications requiring Buck-Boost topology support, alternative components outside the FSL306/FSL3276 family must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can FSL306LRN replace FSL3276ALRN in all applications?

A: The FSL306LRN is a direct substitute for applications using Buck or Flyback topologies. If your design requires Buck-Boost topology, the FSL306LRN does not support this configuration and alternative components must be selected.

Q: Are there package compatibility concerns?

A: No. Both components use identical 8-DIP (0.300", 7.62mm) packaging with 7 leads and through-hole mounting. No PCB modifications are required.

Q: What is the significance of the power rating difference?

A: The FSL306LRN is rated for 7W compared to the FSL3276ALRN at 2.4W. This higher rating provides additional thermal margin and supports higher power applications without derating.

Q: Does the FSL306LRN meet current compliance standards?

A: Yes. The FSL306LRN is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: Why is the FSL3276ALRN obsolete?

A: The FSL3276ALRN is classified as obsolete by the manufacturer. The FSL306LRN represents the active product line continuation with equivalent electrical performance and enhanced power capability.