TOP243R-TL Equivalent & Substitute Parts

Part Overview

The TOP243R-TL is an offline switch IC designed for flyback converter topologies, manufactured by Power Integrations as part of the TOPSwitch®-GX series. This device integrates a 700V breakdown voltage power switch with integrated control circuitry for isolated power supply applications operating at 66kHz to 132kHz switching frequency with 45W power handling capability.

The TOP243R-TL carries a "Not For New Designs" product status designation. This status indicates the part is in mature production phase and no longer recommended for new circuit designs. Organizations developing new power management solutions should evaluate equivalent substitute parts from the TOPSwitch®-GX series that offer enhanced performance characteristics or improved availability while maintaining electrical and mechanical compatibility.

Substiute Parts

TOP243R-TL

Power IntegrationsIn Stock: 1972TOP243R-TL Datasheet

Current PartRFQ

TOP244R-TL

Power IntegrationsIn Stock: 5329TOP244R-TL Datasheet

Parametric EquivalentRFQ

TOP245R-TL

Power IntegrationsIn Stock: 16214TOP245R-TL Datasheet

Parametric EquivalentRFQ

TOP246R-TL

Power IntegrationsIn Stock: 1842TOP246R-TL Datasheet

Parametric EquivalentRFQ

TOP247R-TL

Power IntegrationsIn Stock: 1730TOP247R-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts within the TOPSwitch®-GX series maintain electrical and mechanical compatibility with the TOP243R-TL based on the following criteria:

Electrical Compatibility Parameters:

• Voltage - Breakdown: 700V (constant across all substitutes)
• Topology: Flyback (constant across all substitutes)
• Frequency - Switching: 66kHz ~ 132kHz (constant across all substitutes)
• Duty Cycle: 66.5% (constant across all substitutes)
• Output Isolation: Isolated (constant across all substitutes)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage (constant across all substitutes)
• Control Features: Frequency Control (constant across all substitutes)

Mechanical Compatibility Parameters:

• Package / Case: TO-263-7, D2PAK (6 Leads + Tab) (constant across all substitutes)
• Supplier Device Package: TO-263-7C (constant across all substitutes)
• Mounting Type: Surface Mount (constant across all substitutes)

Variable Parameter (Substitution Basis):

• Power (Watts): Ranges from 45W to 70W across the series

The substitute parts TOP244R-TL, TOP245R-TL, TOP246R-TL, and TOP247R-TL are classified as parametric equivalents because they share identical electrical topology, switching characteristics, protection features, and physical packaging while offering increased power handling capacity. The primary differentiator is the maximum power rating, which increases progressively across the series.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: All parts in this substitution group, including the TOP243R-TL and its equivalents, carry "Not For New Designs" status. This designation reflects the mature lifecycle phase of the TOPSwitch®-GX series within Power Integrations' product portfolio. For new circuit development, evaluation of current-generation alternatives from Power Integrations should be conducted in parallel with any substitution decisions.

Compliance and Certification: All substitute parts maintain identical compliance profiles:

• RoHS Status: RoHS non-compliant (all parts)
• REACH Status: REACH Unaffected (all parts)
• ECCN: EAR99 (all parts)
• HTSUS: 8542.39.0001 (all parts)
• Moisture Sensitivity Level: 4 (72 Hours) (all parts)

Power Rating Selection: Selection among substitute parts should be based on application power requirements. The TOP243R-TL (45W) represents the baseline rating. Higher power applications may utilize TOP244R-TL (50W), TOP245R-TL (57W), TOP246R-TL (64W), or TOP247R-TL (70W) without modification to circuit topology or control strategy, provided thermal management and PCB layout accommodate the increased power dissipation.

Packaging Consideration: The TOP243R-TL is supplied in Tape & Reel (TR) packaging, while substitute parts are available in Cut Tape (CT) packaging. This difference affects procurement and assembly processes but does not impact electrical performance or mechanical fit in TO-263-7 footprints.

Frequently Asked Questions (FAQ)

Q: Can TOP244R-TL, TOP245R-TL, TOP246R-TL, or TOP247R-TL be used as direct replacements for TOP243R-TL in existing designs?

A: Yes, these parts are pin-compatible and electrically equivalent substitutes. All maintain identical 700V breakdown voltage, 66kHz to 132kHz switching frequency, TO-263-7 package footprint, and integrated protection features. The primary difference is increased power handling capacity. Existing circuit designs will function with any substitute part without modification to component values or PCB layout.

Q: What is the significance of the power rating difference between TOP243R-TL (45W) and TOP247R-TL (70W)?

A: Power rating indicates the maximum continuous power the device can safely dissipate under specified thermal conditions. Selection should match application requirements. Using a higher-rated part (e.g., TOP247R-TL in place of TOP243R-TL) provides thermal margin and improved reliability in power-limited applications. Using a lower-rated part in a higher-power application risks thermal shutdown or device failure.

Q: Are there differences in control features or protection mechanisms between these substitute parts?

A: No. All parts in this group implement identical control features (Frequency Control) and fault protection mechanisms (Current Limiting, Over Temperature, Over Voltage). The duty cycle (66.5%) and operating temperature range (-40°C to 150°C junction temperature) are also identical across all substitutes.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging supplies components on continuous carrier tape wound on reels, suitable for high-volume automated assembly. Cut Tape packaging supplies the same components on shorter tape segments, typically used for lower-volume orders or manual assembly. Both formats contain identical components in TO-263-7 packages. The packaging format does not affect electrical performance or mechanical compatibility.

Q: Why do substitute parts show different inventory levels?

A: Inventory levels reflect current stock availability from the supplier and do not indicate product quality or performance differences. TOP245R-TL shows the highest inventory (16,200 pcs), while TOP246R-TL and TOP247R-TL show lower levels (1,750 and 1,700 pcs respectively). Inventory status is subject to change and should be verified at time of procurement.

Q: Are all these parts suitable for new design work?

A: All parts carry "Not For New Designs" status, indicating they are in mature production phase. While these parts remain available and functional for replacement or continuation of existing designs, Power Integrations recommends evaluating current-generation alternatives for new circuit development to ensure access to the latest performance improvements and long-term supply continuity.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: Yes, all substitute parts use identical TO-263-7 D2PAK footprints with 6 leads plus tab. PCB layouts designed for TOP243R-TL will accommodate any substitute part without modification. Thermal design should account for the power rating of the selected part to ensure adequate heat dissipation.