TOP242GN-TL Equivalent & Substitute Parts

Part Overview

The TOP242GN-TL is an offline flyback converter IC manufactured by Power Integrations, belonging to the TOPSwitch®-GX series. This device integrates a high-voltage switch with comprehensive fault protection including current limiting, over-temperature, and over-voltage protection. The part operates at switching frequencies between 66 kHz and 132 kHz with a 15 W power rating and 700 V breakdown voltage, designed for isolated flyback topology applications.

The TOP242GN-TL carries a "Not For New Designs" product status. This designation necessitates identification of equivalent and substitute parts for ongoing production support, maintenance applications, and design continuity where existing systems utilize this component.

Substiute Parts

TOP242GN-TL

Power IntegrationsIn Stock: 23383TOP242GN-TL Datasheet

Current PartRFQ

TOP252GN-TL

Power IntegrationsIn Stock: 3091TOP252GN-TL Datasheet

SimilarRFQ

TOP243GN-TL

Power IntegrationsIn Stock: 18359TOP243GN-TL Datasheet

Parametric EquivalentRFQ

TOP244GN-TL

Power IntegrationsIn Stock: 25093TOP244GN-TL Datasheet

Parametric EquivalentRFQ

TOP245GN-TL

Power IntegrationsIn Stock: 6224TOP245GN-TL Datasheet

Parametric EquivalentRFQ

TOP246GN-TL

Power IntegrationsIn Stock: 3807TOP246GN-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP242GN-TL is determined by strict alignment of electrical and mechanical parameters within the TOPSwitch®-GX and TOPSwitch®-HX series families. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Voltage breakdown rating: 700 V (mandatory match)
• Topology: Flyback (mandatory match)
• Output isolation: Isolated (mandatory match)
• Package / Case: 8-SMD (7 Leads), Gull Wing (mandatory match)
• Mounting type: Surface Mount (mandatory match)
• Operating temperature range: -40°C ~ 150°C (TJ) (mandatory match)
• Fault protection: Current Limiting, Over Temperature, Over Voltage (mandatory match)
• RoHS compliance: RoHS Compliant (mandatory match)
• MSL rating: 4 (72 Hours) (mandatory match)

Secondary Substitution Parameters (Allowable Variation):

• Power rating: 15 W to 34 W (higher power ratings acceptable for 15 W applications)
• Switching frequency: 66 kHz ~ 132 kHz range (66 kHz fixed acceptable)
• Duty cycle: 66.5% to 78% (within operational tolerance)
• Series designation: TOPSwitch®-GX or TOPSwitch®-HX (both acceptable)
• Product status: Active or Not For New Designs (both acceptable for substitution)
• Packaging format: Cut Tape (CT), Tape & Reel (TR), or Digi-Reel® (all acceptable)
• Control features: Frequency Control or absence thereof (both acceptable)

The TOP242GN-TL substitutes are identified as: TOP246GN-TL, TOP245GN-TL, TOP252GN-TL, TOP244GN-TL, and TOP243GN-TL.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Power Rating):

The TOP252GN-TL serves as a direct functional equivalent for the TOP242GN-TL in 15 W applications. Both devices deliver identical power output and maintain full electrical compatibility. The TOP252GN-TL operates at a fixed 66 kHz switching frequency with 78% duty cycle, compared to the TOP242GN-TL's variable 66 kHz to 132 kHz range with 66.5% duty cycle. The TOP252GN-TL carries Active product status, making it the preferred choice for new production and long-term supply continuity. Both parts share identical package specifications (SMD-8C and SMD-8B respectively), thermal ratings, and compliance certifications.

For Higher Power Capacity Applications:

The TOP243GN-TL (25 W), TOP244GN-TL (28 W), TOP245GN-TL (30 W), and TOP246GN-TL (34 W) provide increased power handling capacity while maintaining full electrical and mechanical compatibility with the TOP242GN-TL. These parts remain within the TOPSwitch®-GX series with identical switching frequency ranges, duty cycles, and control features. Selection among these higher-rated devices depends on the specific power requirements of the application. All four parts retain "Not For New Designs" status, consistent with the original TOP242GN-TL designation.

Compliance and Regulatory Considerations:

All substitute parts maintain RoHS compliance, REACH unaffected status, and identical MSL ratings (4, 72 Hours). Export classification (ECCN EAR99) and tariff codes (HTSUS 8542.39.0001) remain consistent across all substitutes, eliminating regulatory complications in component sourcing and supply chain management.

Packaging and Inventory Availability:

Substitute parts are available in multiple packaging formats: Cut Tape (CT), Tape & Reel (TR), and Digi-Reel®. Current inventory levels vary across the substitute family, with TOP244GN-TL maintaining the highest stock (25,072 pcs) and TOP252GN-TL the lowest (3,024 pcs). Packaging format selection should align with production volume and assembly line requirements.

Frequently Asked Questions (FAQ)

Q: Can the TOP252GN-TL replace the TOP242GN-TL in existing designs?

A: Yes. The TOP252GN-TL is electrically and mechanically compatible with the TOP242GN-TL for 15 W applications. Both devices share identical voltage breakdown (700 V), topology (Flyback), package configuration (8-SMD, Gull Wing), and fault protection features. The primary difference is switching frequency operation: TOP252GN-TL operates at fixed 66 kHz, while TOP242GN-TL operates across 66 kHz to 132 kHz. The TOP252GN-TL carries Active product status, providing superior long-term supply assurance.

Q: What is the difference between TOP243GN-TL, TOP244GN-TL, TOP245GN-TL, and TOP246GN-TL?

A: These four parts differ exclusively in power rating: TOP243GN-TL (25 W), TOP244GN-TL (28 W), TOP245GN-TL (30 W), and TOP246GN-TL (34 W). All other electrical parameters, including voltage breakdown, switching frequency range, duty cycle, fault protection, and control features, remain identical. Selection depends on the power capacity required by the application. Higher-rated devices are suitable for applications originally designed for lower power, provided thermal management and circuit design accommodate the increased capability.

Q: Are there package compatibility issues when substituting these parts?

A: All substitute parts maintain the same physical package specification: 8-SMD (7 Leads), Gull Wing configuration. However, the supplier device package designation varies slightly: TOP242GN-TL, TOP243GN-TL, TOP244GN-TL, TOP245GN-TL, and TOP246GN-TL use SMD-8B, while TOP252GN-TL uses SMD-8C. Both SMD-8B and SMD-8C are functionally equivalent 8-lead surface-mount packages with identical lead pitch and gull-wing geometry. PCB footprints designed for one designation are compatible with the other.

Q: Why is TOP242GN-TL marked "Not For New Designs"?

A: The "Not For New Designs" designation indicates that Power Integrations no longer recommends this part for new product development. This status typically reflects product maturity or transition to newer series. For ongoing production support of existing designs, the TOP242GN-TL remains available. For new designs, the TOP252GN-TL (Active status) is the recommended equivalent, offering identical functionality with assured long-term supply.

Q: What are the thermal and compliance advantages of these substitutes?

A: All substitute parts maintain identical operating temperature range (-40°C to 150°C junction temperature), RoHS compliance, and MSL rating (4, 72 Hours). Moisture sensitivity handling, storage, and reflow procedures are identical across the entire substitute family. Export classification (ECCN EAR99) and tariff codes (HTSUS 8542.39.0001) are consistent, eliminating regulatory complications in international supply chains.

Q: Can I use a higher-power-rated substitute in a 15 W application?

A: Yes. The TOP243GN-TL through TOP246GN-TL are electrically and mechanically compatible with the TOP242GN-TL and can be used in 15 W applications. Higher power ratings indicate greater current-handling capacity and thermal capability, making these parts suitable for applications with lower power demands. Circuit design and thermal management must remain appropriate for the application; oversizing does not introduce incompatibility or functional issues.

Q: What packaging options are available for these substitutes?

A: Substitute parts are supplied in three packaging formats: Cut Tape (CT), Tape & Reel (TR), and Digi-Reel®. Cut Tape is suitable for small-volume or manual assembly operations. Tape & Reel and Digi-Reel® formats are optimized for high-volume automated assembly. Selection should align with production volume, assembly equipment capabilities, and inventory management requirements. All packaging formats contain identical components with identical electrical specifications.