TOP224P Equivalent & Substitute Parts Reference

Part Overview

The TOP224P is an offline switch IC from Power Integrations' TOPSwitch®-II series, designed for isolated power conversion applications. This device functions as a controller and integrated power switch for boost, buck, flyback, and forward converter topologies operating at 100kHz switching frequency with 30W power capability.

The TOP224P is classified as Obsolete, which necessitates identification of equivalent substitute components for ongoing design support and production continuity. Substitute parts within the TOPSwitch®-II family provide functional alternatives while maintaining compatibility with existing circuit topologies and PCB layouts.

Substiute Parts

TOP224P

Power IntegrationsIn Stock: 1976TOP224P Datasheet

Current PartRFQ

TOP224PN

Power IntegrationsIn Stock: 18350TOP224PN Datasheet

DirectRFQ

TOP221PN

Power IntegrationsIn Stock: 17224TOP221PN Datasheet

Parametric EquivalentRFQ

TOP222PN

Power IntegrationsIn Stock: 17336TOP222PN Datasheet

Parametric EquivalentRFQ

TOP223PN

Power IntegrationsIn Stock: 19404TOP223PN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution within the TOPSwitch®-II family is determined by the following critical parameters that remain constant across all qualified alternatives:

Fixed Parameters (Must Match for Substitution):

• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Voltage - Breakdown: 700V
• Topology Support: Boost, Buck, Flyback, Forward
• Frequency - Switching: 100kHz
• Duty Cycle: 67%
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Fault Protection: Current Limiting, Over Temperature
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Differentiates Part Selection):

• Power (Watts): Ranges from 9W to 30W depending on specific model

The TOP224P (30W) can be substituted with TOP223PN (25W), TOP222PN (15W), or TOP221PN (9W) when the application power requirement does not exceed the substitute part's rating. Conversely, higher-power applications requiring 30W cannot use lower-rated alternatives.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TOP224PN

TOP224PN is the direct equivalent to TOP224P with identical electrical and mechanical specifications. The primary distinction is packaging format (Tube vs. standard packaging) and RoHS compliance status. TOP224PN is RoHS Compliant, whereas TOP224P is RoHS non-compliant. TOP224PN maintains the same 30W power rating and is classified as "Not For New Designs," indicating limited future availability.

Secondary Substitutes: TOP223PN, TOP222PN, TOP221PN

These parts provide parametric equivalence within the TOPSwitch®-II family for applications where power requirements are lower than the original 30W specification:

• TOP223PN: 25W rating (suitable for designs requiring up to 25W)
• TOP222PN: 15W rating (suitable for designs requiring up to 15W)
• TOP221PN: 9W rating (suitable for designs requiring up to 9W)

All secondary substitutes are RoHS Compliant and share identical package, topology support, switching frequency, and protection features with TOP224P. Selection among these alternatives depends solely on the maximum power requirement of the target application.

Compliance Consideration:

If RoHS compliance is a design requirement, TOP224PN, TOP223PN, TOP222PN, and TOP221PN all satisfy this criterion. The original TOP224P does not meet RoHS requirements.

Frequently Asked Questions (FAQ)

Q: Can TOP224P be replaced with TOP223PN in an existing design?

A: TOP223PN can replace TOP224P only if the application power requirement does not exceed 25W. All other electrical and mechanical parameters are identical. If the design requires the full 30W capability of TOP224P, TOP223PN is not suitable.

Q: What is the difference between TOP224P and TOP224PN?

A: TOP224P and TOP224PN are electrically and mechanically identical. The differences are packaging format and RoHS compliance status. TOP224PN is RoHS Compliant, while TOP224P is not. Both have identical 30W power ratings and 8-DIP package specifications.

Q: Are all substitute parts pin-compatible with TOP224P?

A: Yes. All substitute parts (TOP224PN, TOP223PN, TOP222PN, TOP221PN) use the same 8-DIP (0.300", 7.62mm) package with identical pinout, enabling direct PCB replacement without layout modifications.

Q: Which substitute should be selected for a new design?

A: For new designs, select the substitute with the lowest power rating that meets or exceeds the application requirement. All qualified substitutes are classified as "Not For New Designs," indicating they represent legacy technology. Consult Power Integrations for current-generation alternatives if long-term production support is required.

Q: Can TOP221PN (9W) be used in place of TOP224P (30W)?

A: No. TOP221PN has a maximum power rating of 9W and cannot safely operate in applications designed for 30W. Using an undersized power device results in thermal stress, reduced efficiency, and potential component failure.

Q: Are there any differences in operating temperature range among the substitutes?

A: No. All substitute parts operate across the identical temperature range of -40°C to 150°C (junction temperature).

Q: What is the significance of the "Not For New Designs" status?

A: This designation indicates that the part is in end-of-life phase and future availability is not guaranteed. Existing designs may continue to use these parts, but new product development should evaluate alternative solutions from current product lines.