TOP232PN Equivalent & Substitute Parts

Part Overview

The TOP232PN is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-FX series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology applications, delivering 15 W of power with integrated fault protection. The TOP232PN is classified as obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production support.

Substiute Parts

TOP232PN

Power IntegrationsIn Stock: 3325TOP232PN Datasheet

Current PartRFQ

TOP252PN

Power IntegrationsIn Stock: 16863TOP252PN Datasheet

MFR RecommendedRFQ

TOP242PN

Power IntegrationsIn Stock: 1754TOP242PN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP232PN is determined by strict alignment of electrical and mechanical parameters within the Power Integrations TOPSwitch® product family. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Topology: Flyback (isolated converter)
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Power Rating: 15 W
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage

Identified Substitutes:

TOP252PN (MFR Recommended): Meets all primary substitution criteria. Belongs to TOPSwitch®-HX series with active product status. Switching frequency fixed at 66kHz (subset of TOP232PN range). Supplier device package 8-PDIP-C differs from TOP232PN 8-PDIP-B but maintains identical mechanical footprint and lead configuration.

TOP242PN (Similar): Meets all primary substitution criteria. Belongs to TOPSwitch®-GX series with "Not For New Designs" status. Duty cycle 66.5% differs from TOP232PN 78%. Switching frequency 66kHz ~ 132kHz matches TOP232PN range. Supplier device package 8-PDIP-B identical to TOP232PN.

Parameter Comparison

Engineering Selection Recommendations

For Active Production and New Designs:

TOP252PN is the primary substitute for TOP232PN. This component carries active product status from Power Integrations and maintains full electrical and mechanical compatibility. The TOP252PN operates at a fixed switching frequency of 66kHz, which falls within the operational range of the TOP232PN. Both devices share identical duty cycle (78%), power rating (15 W), and fault protection architecture. The transition from 8-PDIP-B to 8-PDIP-C packaging does not affect mechanical compatibility or PCB layout requirements, as both maintain the standard 8-DIP footprint with 0.300" (7.62mm) spacing.

For Legacy System Support:

TOP242PN serves as an alternative substitute when TOP252PN availability is constrained. This component is classified as "Not For New Designs" but remains functionally compatible with TOP232PN applications. The TOP242PN exhibits a lower duty cycle (66.5% versus 78%), which may require circuit optimization in transformer design and feedback network tuning. The switching frequency range (66kHz ~ 132kHz) matches the TOP232PN specification, and all other electrical parameters align with substitution requirements.

Compliance Considerations:

All three components—TOP232PN, TOP252PN, and TOP242PN—maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Selection between TOP252PN and TOP242PN should prioritize TOP252PN due to active product status and ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can TOP252PN directly replace TOP232PN without circuit modifications?

A: TOP252PN maintains electrical and mechanical compatibility with TOP232PN. Both devices operate at 78% duty cycle, 15 W power rating, and 700V breakdown voltage. The fixed 66kHz switching frequency of TOP252PN falls within the 66kHz ~ 132kHz range of TOP232PN. Direct substitution is supported without circuit modifications for applications designed within these parameters.

Q: What is the difference between 8-PDIP-B and 8-PDIP-C packaging?

A: Both 8-PDIP-B and 8-PDIP-C maintain identical mechanical footprint and lead configuration (8-DIP, 0.300" spacing, 7 leads). The package designation suffix indicates different supplier or manufacturing process variants. PCB layout and mounting requirements remain unchanged between these package types.

Q: Why is TOP242PN marked "Not For New Designs"?

A: TOP242PN belongs to the TOPSwitch®-GX series and carries a "Not For New Designs" status, indicating that Power Integrations recommends newer series for future applications. However, TOP242PN remains functionally compatible with TOP232PN for legacy system support and ongoing production of existing designs.

Q: How does the duty cycle difference between TOP242PN (66.5%) and TOP232PN (78%) affect circuit operation?

A: Duty cycle determines the maximum on-time of the internal power switch relative to the switching period. The 11.5% difference between TOP242PN and TOP232PN requires adjustment of transformer turns ratio and feedback network components to maintain equivalent output voltage and regulation characteristics. Applications designed specifically for TOP232PN duty cycle should prioritize TOP252PN substitution to avoid redesign requirements.

Q: Are all three components RoHS compliant?

A: Yes. TOP232PN, TOP252PN, and TOP242PN all carry RoHS Compliant status and maintain unlimited moisture sensitivity rating (MSL 1), meeting environmental and reliability standards for industrial and consumer applications.

Q: What is the inventory status of these substitute parts?

A: TOP252PN (16,771 pcs), TOP242PN (1,668 pcs), and TOP232PN (3,236 pcs) are available as new original stock. TOP252PN offers the highest inventory availability for immediate procurement.