TOP242G Equivalent & Substitute Parts Reference

Part Overview

The TOP242G is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology applications, delivering 15 W of power with switching frequencies between 66 kHz and 132 kHz.

The TOP242G is classified as Obsolete. Locating equivalent substitute parts is necessary for ongoing production support, design updates, and inventory replenishment where original stock becomes unavailable or depleted.

Substiute Parts

TOP242G

Power IntegrationsIn Stock: 933TOP242G Datasheet

Current PartRFQ

TOP242GN-TL

Power IntegrationsIn Stock: 23383TOP242GN-TL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP242G is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Power Rating: 15 W
• Frequency - Switching: 66 kHz ~ 132 kHz
• Duty Cycle: 66.5%
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Package / Case: 8-SMD (7 Leads), Gull Wing
• Mounting Type: Surface Mount
• Internal Switch(s): Yes

The TOP242GN-TL is identified as a direct substitute for the TOP242G. Both parts share identical electrical specifications, thermal operating range, and mechanical packaging. The primary differences are product status classification and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs Using TOP242G:

The TOP242GN-TL provides functional equivalence with identical electrical and thermal performance. Selection between these parts is determined by compliance and product lifecycle requirements:

• TOP242GN-TL is classified as "Not For New Designs" but remains available with higher inventory (23,300 pcs) and RoHS compliance certification. This part is suitable for sustaining production of existing designs and legacy system support.

• TOP242G is classified as "Obsolete" with limited inventory (873 pcs). This part number should not be selected for new procurement unless existing stock is specifically required for continuity.

Compliance Considerations:

The TOP242GN-TL carries RoHS Compliant certification, whereas the TOP242G is RoHS non-compliant. Organizations subject to RoHS regulations must use TOP242GN-TL for new production runs and design revisions.

The TOP242GN-TL specifies Moisture Sensitivity Level 4 (72 Hours), requiring controlled storage and handling during assembly. The TOP242G specifies MSL 1 (Unlimited), indicating less stringent moisture control requirements.

Both parts share identical REACH and ECCN classifications, confirming equivalent regulatory treatment for export and supply chain purposes.

Frequently Asked Questions (FAQ)

Q: Can TOP242GN-TL be used as a direct replacement for TOP242G in existing circuit designs?

A: Yes. Both parts share identical electrical specifications, switching frequency range, power rating, fault protection features, and package configuration. No circuit modifications are required for substitution.

Q: What is the difference between TOP242G and TOP242GN-TL?

A: The parts are electrically and functionally identical. Differences exist in product status (Obsolete vs. Not For New Designs), RoHS compliance (non-compliant vs. compliant), and moisture sensitivity classification (MSL 1 vs. MSL 4). TOP242GN-TL has significantly higher inventory availability.

Q: Which part should be selected for new product designs?

A: Neither part is recommended for new designs. TOP242G is Obsolete; TOP242GN-TL is classified "Not For New Designs." For new development, consult Power Integrations documentation for current-generation TOPSwitch®-GX alternatives.

Q: Are there packaging differences between TOP242G and TOP242GN-TL?

A: Both parts use identical 8-SMD (7 Leads) Gull Wing surface mount packaging (SMD-8B). PCB layout and assembly processes are compatible without modification.

Q: What is the significance of the different Moisture Sensitivity Levels?

A: TOP242G (MSL 1) requires no special moisture control during storage and handling. TOP242GN-TL (MSL 4) requires storage in controlled humidity environments (≤60% RH) and has a 72-hour floor life after moisture exposure. Assembly facilities must implement appropriate bake-out procedures before soldering TOP242GN-TL components.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a material composition requirement, not an electrical specification. Both parts deliver identical electrical performance. RoHS compliance is a regulatory and supply chain requirement for certain markets and applications.

Q: What inventory considerations apply to these parts?

A: TOP242G has 873 pcs available (Obsolete status). TOP242GN-TL has 23,300 pcs available (Not For New Designs status). For sustained production, TOP242GN-TL provides superior supply security and availability.