FSL116LR Equivalent & Substitute Parts

Part Overview

The FSL116LR is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 8-DIP through-hole component operates at 50kHz switching frequency with 16W power handling capability and integrated fault protection including current limiting, overload, overvoltage, and short circuit protection. The FSL116LR is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives from the NCP1076 series provide enhanced specifications while maintaining functional compatibility.

Substiute Parts

FSL116LR

onsemiIn Stock: 15497FSL116LR Datasheet

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NCP1076ABP065G

onsemiIn Stock: 1225NCP1076ABP065G Datasheet

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NCP1076BAP065G

onsemiIn Stock: 1095NCP1076BAP065G Datasheet

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NCP1076BBP065G

onsemiIn Stock: 1164NCP1076BBP065G Datasheet

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NCP1076AAP065G

onsemiIn Stock: 907NCP1076AAP065G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSL116LR is based on the following critical parameters that define functional equivalence:

Core Compatibility Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated power switch
• Mounting Type: Through-hole DIP package
• Fault Protection: Comprehensive protection suite (current limiting, overvoltage, overcurrent, overtemperature)
• Regulatory Compliance: ROHS3 compliant, EAR99 classification

Allowable Parameter Variations:

• Voltage - Breakdown: FSL116LR operates at 650V; substitute parts at 700V provide enhanced voltage margin
• Voltage - Supply Range: FSL116LR 8V~26V vs. NCP1076 series 6.5V~20V represents acceptable operational overlap
• Switching Frequency: FSL116LR 50kHz vs. NCP1076 series 65kHz; higher frequency enables smaller transformer and filter components
• Power Rating: FSL116LR 16W vs. NCP1076 series 31W; higher rating provides design margin
• Operating Temperature: FSL116LR -40°C~105°C (TA) vs. NCP1076 series -40°C~125°C (TJ); extended range supports broader applications
• Package Variants: 7-PDIP and 8-PDIP configurations available; pin count differences require schematic verification

The NCP1076 series (NCP1076AAP065G, NCP1076ABP065G, NCP1076BAP065G, NCP1076BBP065G) represents active production alternatives with superior electrical specifications and extended temperature ratings.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FSL116LR is classified as obsolete. All four substitute parts from the NCP1076 series maintain active production status, ensuring long-term availability and supply chain continuity for new designs and production runs.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and EAR99 classification identical to the FSL116LR, satisfying regulatory requirements for equivalent component selection.

Package Selection:

• NCP1076AAP065G and NCP1076ABP065G: 7-PDIP configuration (7 leads)
• NCP1076BAP065G and NCP1076BBP065G: 8-PDIP configuration (8 leads)

Pin count differences require schematic verification to confirm compatibility with existing PCB layouts. The 8-PDIP variants (NCP1076BAP065G, NCP1076BBP065G) provide direct footprint compatibility with the original FSL116LR 8-DIP package.

Electrical Performance: All NCP1076 variants deliver enhanced specifications: 700V breakdown voltage (vs. 650V), 31W power rating (vs. 16W), and extended operating temperature range to 125°C (vs. 105°C). These improvements provide design margin and thermal headroom for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can NCP1076 series parts directly replace FSL116LR in existing designs? A: Direct replacement depends on package configuration. NCP1076BAP065G and NCP1076BBP065G (8-PDIP) offer footprint compatibility with FSL116LR (8-DIP). NCP1076AAP065G and NCP1076ABP065G (7-PDIP) require PCB modification. All variants maintain functional compatibility through identical topology, isolation, and fault protection architecture.

Q: What is the significance of the higher 700V breakdown voltage in NCP1076 parts? A: The 700V rating (vs. FSL116LR 650V) provides 50V additional voltage margin, enhancing robustness against transient overvoltage conditions and improving long-term reliability in high-voltage input applications.

Q: How does the 65kHz switching frequency of NCP1076 parts affect circuit design compared to FSL116LR 50kHz? A: Higher switching frequency enables smaller transformer core and output filter components, reducing overall power supply size and weight. Existing transformer designs may require recalculation for the NCP1076 series to optimize efficiency and thermal performance.

Q: Are there inventory considerations for substitute part selection? A: Current inventory levels are: NCP1076BAP065G (1016 pcs), NCP1076BBP065G (1121 pcs), NCP1076ABP065G (1117 pcs), NCP1076AAP065G (871 pcs). All variants maintain adequate stock for production requirements.

Q: What is the difference between the four NCP1076 variants? A: Variants differ in package configuration (7-PDIP vs. 8-PDIP) and internal design variant (AA, AB, BA, BB designations). Electrical specifications and fault protection features remain identical across all four parts. Selection should be based on PCB footprint requirements and available inventory.

Q: Does the lower startup voltage of NCP1076 (8.4V vs. 12V) affect circuit operation? A: Lower startup voltage improves cold-start performance in low-input-voltage applications. Existing designs operating above 8.4V experience no functional change. Applications with marginal startup voltage may benefit from improved startup reliability.