TOP244FN Equivalent & Substitute Parts

Part Overview

The TOP244FN is an offline flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This component integrates a high-voltage power switch with control circuitry for isolated power supply applications operating at 66kHz to 132kHz switching frequency with 65W output power capability. The device features integrated current limiting, over-temperature, and over-voltage protection in a TO-262-7C through-hole package.

The TOP244FN is classified as obsolete. Identifying equivalent substitute parts is necessary to support ongoing design requirements, system maintenance, and production continuity where this component is specified in existing applications.

Substiute Parts

TOP244FN

Power IntegrationsIn Stock: 1379TOP244FN Datasheet

Current PartRFQ

TOP266KG-TL

Power IntegrationsIn Stock: 35455TOP266KG-TL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP244FN is determined by the following critical parameters:

Topology & Functional Requirements: Both the main part and substitute must operate as offline flyback converters with isolated output and integrated high-voltage switching capability.

Voltage Rating: Breakdown voltage must meet or exceed the 700V specification of the TOP244FN to ensure safe operation in offline applications.

Switching Frequency: Operating frequency range must overlap with or encompass the 66kHz to 132kHz specification to maintain circuit timing and transformer design compatibility.

Power Capability: Output power rating must support the 65W requirement of the application.

Fault Protection: Integrated protection features (current limiting, over-temperature, over-voltage) must be present to maintain system safety margins.

Control Features: Frequency control capability must be retained for proper converter operation.

Operating Temperature Range: The -40°C to 150°C junction temperature range must be supported.

Compliance & Certifications: RoHS compliance and REACH status must be maintained for regulatory continuity.

The TOP266KG-TL qualifies as a substitute based on these criteria, though package and mounting type differ, requiring PCB redesign considerations.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The TOP244FN is obsolete, making the active-status TOP266KG-TL the appropriate substitute for new production or long-term supply assurance. The TOP266KG-TL is manufactured by the same supplier and remains in active production.

Compliance Continuity: Both parts maintain RoHS compliance and REACH unaffected status, ensuring regulatory requirements are satisfied in the substitution.

Package & Mounting Implications: The TOP244FN uses through-hole TO-262-7C packaging, while the TOP266KG-TL uses surface-mount 12-ESOP packaging. This difference requires complete PCB layout redesign and assembly process modification. The substitution is not a direct pin-for-pin replacement.

Power Rating Differential: The TOP266KG-TL is rated at 58W versus the TOP244FN's 65W. Applications operating near the 65W maximum must be evaluated to confirm the 58W rating is sufficient for the intended load.

Enhanced Protection Features: The TOP266KG-TL includes over-load and short-circuit protection in addition to the current limiting, over-temperature, and over-voltage protection present in the TOP244FN. These additional protections provide improved system reliability.

Moisture Sensitivity: The TOP266KG-TL carries MSL-3 rating (168 hours), requiring controlled storage and handling procedures, whereas the TOP244FN has MSL-1 (unlimited). Storage and assembly processes must accommodate this requirement.

Frequently Asked Questions (FAQ)

Q: Can the TOP266KG-TL directly replace the TOP244FN on existing PCBs?

A: No. The TOP244FN uses a through-hole TO-262-7C package with 6 leads, while the TOP266KG-TL uses a surface-mount 12-ESOP package with 11 leads and an exposed pad. PCB redesign is required for substitution.

Q: What is the significance of the different power ratings (65W vs. 58W)?

A: The TOP244FN is rated for 65W output power, while the TOP266KG-TL is rated for 58W. Applications must be evaluated to confirm that the 58W rating accommodates the intended load. If the application requires the full 65W capability, the TOP266KG-TL may not be suitable.

Q: Are the switching frequency ranges compatible?

A: Yes. Both parts support 66kHz and 132kHz switching frequencies. The TOP244FN specifies a continuous range (66kHz ~ 132kHz), while the TOP266KG-TL specifies discrete frequencies (66kHz, 132kHz). For applications using either 66kHz or 132kHz operation, compatibility is confirmed.

Q: What does the MSL-3 rating on the TOP266KG-TL mean for handling?

A: MSL-3 (Moisture Sensitivity Level 3) indicates the component can be exposed to ambient conditions for a maximum of 168 hours before soldering. The component must be stored in a dry environment and baked according to IPC standards if the 168-hour limit is exceeded. The TOP244FN has MSL-1, requiring no such precautions.

Q: Does the TOP266KG-TL provide better protection than the TOP244FN?

A: The TOP266KG-TL includes over-load and short-circuit protection in addition to the current limiting, over-temperature, and over-voltage protection found in the TOP244FN. These additional protections enhance system safety but do not affect functional substitution compatibility.

Q: Why is the TOP244FN obsolete?

A: The TOP244FN belongs to the TOPSwitch®-GX series, which has been superseded by newer TOPSwitch® generations including the TOPSwitch®-JX series (represented by the TOP266KG-TL). Obsolescence reflects the manufacturer's product lifecycle transition to newer technology platforms.

Q: Are there other substitute options besides the TOP266KG-TL?

A: Based on the provided substitute list, the TOP266KG-TL is the identified equivalent part. Other Power Integrations offline flyback converters may exist, but only the TOP266KG-TL is specified as a substitute in this reference.