TOP232P Equivalent & Substitute Parts Reference

Part Overview

The TOP232P is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device operates in the TOPSwitch®-FX series and delivers 15W output power using flyback topology with integrated frequency control and comprehensive fault protection. The TOP232P is classified as obsolete, making identification of compatible substitute components essential for ongoing production support, design updates, and inventory management.

Substiute Parts

TOP232P

Power IntegrationsIn Stock: 1384TOP232P Datasheet

Current PartRFQ

TOP242PN

Power IntegrationsIn Stock: 1754TOP242PN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP232P is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Topology: Flyback
• Output Isolation: Isolated
• Power Output: 15 W
• Voltage - Breakdown: 700V
• Frequency - Switching: 66kHz ~ 132kHz range
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting Type: Through Hole
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control

The TOP242PN qualifies as a parametric equivalent substitute based on these criteria. Both devices share identical electrical specifications for power delivery, voltage ratings, switching frequency range, thermal operating limits, and protection mechanisms. Both utilize 8-DIP through-hole packaging with 7 leads and isolated flyback topology.

Differences Between TOP232P and TOP242PN:

• Series: TOP232P belongs to TOPSwitch®-FX; TOP242PN belongs to TOPSwitch®-GX
• Duty Cycle: TOP232P operates at 78%; TOP242PN operates at 66.5%
• Product Status: TOP232P is Obsolete; TOP242PN is Not For New Designs
• RoHS Compliance: TOP232P is non-compliant; TOP242PN is compliant

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs Using TOP232P:

The TOP242PN serves as the direct parametric equivalent for applications currently utilizing the TOP232P. Both devices deliver identical power output, voltage ratings, switching frequency range, and thermal performance within the specified operating range of -40°C to 150°C junction temperature.

Compliance Considerations:

The TOP232P is RoHS non-compliant and classified as obsolete. The TOP242PN is RoHS compliant, making it the appropriate choice for new production runs or designs subject to RoHS regulatory requirements. Both devices maintain REACH Unaffected status.

Product Status Impact:

The TOP232P's obsolete status indicates end-of-life status with no further manufacturing. The TOP242PN's "Not For New Designs" classification indicates limited availability and suggests evaluation of longer-term alternatives for new product development. For immediate replacement in existing applications, the TOP242PN provides functional equivalence.

Duty Cycle Variation:

The duty cycle difference (78% for TOP232P versus 66.5% for TOP242PN) reflects internal design optimization between the FX and GX series. This parameter does not affect substitution eligibility when all other electrical and mechanical specifications align.

Frequently Asked Questions (FAQ)

Q: Can TOP242PN directly replace TOP232P in existing circuit boards?

A: Yes. Both devices share identical package specifications (8-DIP, 0.300" spacing, 7 leads), mounting type (through hole), and electrical ratings (15W, 700V breakdown, 66-132kHz switching frequency). Pin-to-pin compatibility is maintained, allowing direct socket substitution.

Q: What is the significance of the duty cycle difference between these parts?

A: Duty cycle is an internal operational parameter that reflects how the device manages switching cycles. The difference between 78% (TOP232P) and 66.5% (TOP242PN) represents design optimization within each series but does not affect the device's ability to function as a substitute in applications designed for either specification.

Q: Why is TOP232P classified as obsolete while TOP242PN is "Not For New Designs"?

A: Obsolete status indicates the TOP232P is no longer manufactured and existing inventory is depleted. "Not For New Designs" indicates TOP242PN has limited production support and should not be selected for new product development. For legacy system support, TOP242PN remains available; for new designs, evaluation of current-generation alternatives is recommended.

Q: Are there RoHS compliance implications for substitution?

A: Yes. The TOP232P is RoHS non-compliant; the TOP242PN is RoHS compliant. If your application or market requires RoHS compliance, the TOP242PN substitution satisfies this requirement. If legacy non-compliant designs are acceptable, both parts function identically.

Q: What thermal performance should be expected from TOP242PN as a substitute?

A: Both devices operate across the identical temperature range of -40°C to 150°C junction temperature. Thermal performance and heat dissipation characteristics are equivalent, with no derating required when substituting TOP242PN for TOP232P in designs already validated for this temperature range.

Q: Are packaging and moisture sensitivity considerations identical?

A: Yes. Both devices use 8-DIP through-hole packaging with identical lead spacing (0.300", 7.62mm). Both carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.