TOP247FN Equivalent & Substitute Parts

Part Overview

The TOP247FN is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device operates in the TOPSwitch®-GX series and delivers up to 165 W of power using flyback topology with switching frequencies between 66 kHz and 132 kHz. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Substitutes must maintain functional equivalence in isolated flyback converter applications while accommodating differences in packaging, power rating, and electrical specifications.

Substiute Parts

TOP247FN

Power IntegrationsIn Stock: 36134TOP247FN Datasheet

Current PartRFQ

TOP269KG-TL

Power IntegrationsIn Stock: 4402TOP269KG-TL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP247FN is determined by the following critical parameters:

Functional Equivalence Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated power switch
• Fault Protection: Current limiting and over-temperature protection as minimum requirements
• Control Features: Frequency control capability

Electrical Compatibility Criteria:

• Voltage - Breakdown: Equal to or greater than 700 V
• Frequency - Switching: Overlapping or compatible switching frequency range (66 kHz, 132 kHz)
• Operating Temperature Range: -40°C ~ 150°C (TJ)

Regulatory & Compliance Criteria:

• RoHS Compliance: Required
• REACH Status: Unaffected
• ECCN Classification: EAR99

The TOP269KG-TL qualifies as a substitute based on these criteria. However, design integration requires accommodation of differences in power rating (81 W vs. 165 W), package type (12-ESOP surface mount vs. TO-262-7 through hole), and duty cycle (78% vs. 66.5%).

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The TOP247FN is classified as obsolete. The TOP269KG-TL is an active product from Power Integrations' current TOPSwitch®-JX series, ensuring long-term availability and manufacturing support.

Compliance & Certification: Both parts maintain RoHS compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications. Both are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Power Rating Limitation: The TOP269KG-TL is rated for 81 W maximum power output, compared to the TOP247FN's 165 W rating. Applications requiring the full 165 W power envelope cannot be directly substituted without circuit redesign or parallel configurations.

Package & Mounting Transition: Substitution requires transition from through-hole TO-262-7 packaging to surface-mount 12-ESOP packaging. This necessitates PCB layout redesign and assembly process modification. Pin count increases from 6 to 11 leads, requiring schematic and layout updates.

Electrical Parameter Accommodation: The TOP269KG-TL operates at a higher duty cycle (78% vs. 66.5%) and includes additional fault protection features (over-load and short-circuit protection). Transformer and feedback network design must be re-evaluated for the new duty cycle specification.

Inventory & Lead Time: The TOP269KG-TL maintains active inventory (4,300 pcs) with ongoing manufacturing support, whereas the TOP247FN has limited remaining stock (36,088 pcs) with no future production.

Frequently Asked Questions (FAQ)

Q: Can the TOP269KG-TL directly replace the TOP247FN without PCB modifications?

A: No. The TOP269KG-TL uses 12-ESOP surface-mount packaging with 11 leads, while the TOP247FN uses TO-262-7 through-hole packaging with 6 leads. PCB layout redesign is required. Pin assignments and control circuitry must be verified against respective datasheets.

Q: What is the impact of the lower power rating on substitution?

A: The TOP269KG-TL is rated for 81 W maximum output power, while the TOP247FN supports 165 W. Applications operating above 81 W cannot use the TOP269KG-TL as a direct substitute. Circuit redesign or alternative topologies must be considered for higher power requirements.

Q: Are the switching frequencies compatible between these parts?

A: Yes. Both parts support 66 kHz and 132 kHz switching frequencies. However, the TOP247FN specifies a continuous range (66 kHz ~ 132 kHz), while the TOP269KG-TL lists discrete frequency options (66 kHz, 132 kHz). Frequency control implementation must be verified against the specific datasheet requirements.

Q: What additional protections does the TOP269KG-TL provide?

A: The TOP269KG-TL includes over-load and short-circuit protection in addition to the current limiting, over-temperature, and over-voltage protections present in the TOP247FN. These additional protections enhance system reliability but may require feedback network adjustments.

Q: Does the higher duty cycle of the TOP269KG-TL affect transformer design?

A: Yes. The TOP269KG-TL operates at 78% duty cycle compared to the TOP247FN's 66.5%. This affects transformer core selection, winding ratios, and energy storage calculations. Transformer design must be recalculated for the new duty cycle specification.

Q: What is the moisture sensitivity impact of the TOP269KG-TL?

A: The TOP269KG-TL has MSL 3 (168 hours), requiring moisture control during storage and handling. The TOP247FN has MSL 1 (unlimited), requiring no special moisture precautions. Surface-mount components typically require stricter moisture management than through-hole components.

Q: Is the higher breakdown voltage of the TOP269KG-TL (725 V vs. 700 V) significant?

A: The 25 V difference provides marginal additional headroom but does not fundamentally change application suitability. Both ratings are suitable for standard offline AC-DC converter applications with typical input voltage ranges.

Q: Can both parts be used in the same application with different PCB revisions?

A: Yes, provided the application power requirement does not exceed 81 W. Separate PCB designs would be required for each part due to packaging differences. Design documentation must clearly specify which part number applies to each PCB revision.