TOP234PN Equivalent & Substitute Parts

Part Overview

The TOP234PN is an offline 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, rated at 30W power output with 700V breakdown voltage. The TOP234PN is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production continuity. Equivalent parts maintain functional compatibility while substitute parts offer alternative solutions with comparable electrical and mechanical characteristics.

Substiute Parts

TOP234PN

Power IntegrationsIn Stock: 1791TOP234PN Datasheet

Current PartRFQ

TOP254PN

Power IntegrationsIn Stock: 20365TOP254PN Datasheet

MFR RecommendedRFQ

TOP244PN

Power IntegrationsIn Stock: 6252TOP244PN Datasheet

SimilarRFQ

TOP245PN

Power IntegrationsIn Stock: 2075TOP245PN Datasheet

Parametric EquivalentRFQ

STR-A6069H

Sanken Electric USA Inc.In Stock: 3228STR-A6069H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP234PN is determined by alignment of the following critical parameters:

Topology & Isolation: All substitute parts maintain flyback topology with isolated output configuration, essential for functional equivalence in offline converter applications.

Voltage Rating: All candidates maintain 700V breakdown voltage, ensuring compatibility with input voltage stress conditions.

Package & Mounting: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging, enabling direct PCB footprint compatibility.

Power Rating & Frequency Range: Substitute parts operate within comparable power ranges (28W–30W) and switching frequency bands (66kHz–132kHz), supporting similar transformer and filter designs.

Fault Protection: All parts include current limiting, over-temperature, and over-voltage protection, maintaining system safety requirements.

Compliance: All parts are RoHS Compliant with MSL 1 rating, meeting environmental and moisture sensitivity standards.

Substitutes are categorized as follows:

• MFR Recommended: TOP254PN (Power Integrations, Active status, TOPSwitch®-HX series)
• Similar: TOP244PN (Power Integrations, Not For New Designs, TOPSwitch®-GX series)
• Parametric Equivalent: TOP245PN (Power Integrations, Not For New Designs, TOPSwitch®-GX series)
• Similar (Cross-Manufacturer): STR-A6069H (Sanken Electric USA Inc., Active status, STR-A6000 series)

Parameter Comparison

Engineering Selection Recommendations

TOP254PN (MFR Recommended Substitute)

The TOP254PN is the manufacturer-recommended substitute for the obsolete TOP234PN. This part is currently in Active product status and belongs to the newer TOPSwitch®-HX series. The TOP254PN maintains identical 700V breakdown voltage, 30W power capability, and 8-DIP through-hole packaging. The switching frequency is fixed at 66kHz (compared to the TOP234PN's 66kHz–132kHz range), and duty cycle remains at 78%. All fault protection features and RoHS compliance are preserved. The Active status ensures long-term availability and ongoing manufacturer support.

TOP245PN (Parametric Equivalent)

The TOP245PN provides parametric equivalence with the TOP234PN, matching the 30W power rating, 700V breakdown voltage, and 78% duty cycle. This part operates within the same 66kHz–132kHz switching frequency range and includes frequency control features identical to the main part. However, TOP245PN carries a Not For New Designs status, limiting its suitability for new product development. This part is appropriate for legacy system maintenance and repair applications where design continuity is required.

TOP244PN (Similar Substitute)

The TOP244PN shares the same 700V breakdown voltage, 8-DIP package, and frequency control capability as the TOP234PN. Power output is rated at 28W (compared to 30W), and duty cycle is 66.5% (compared to 78%). The switching frequency range of 66kHz–132kHz matches the main part. TOP244PN carries a Not For New Designs status and is suitable for legacy applications where minor power derating is acceptable.

STR-A6069H (Cross-Manufacturer Alternative)

The STR-A6069H from Sanken Electric USA Inc. maintains 700V breakdown voltage, 30W power rating, and 8-DIP through-hole packaging. This part is in Active product status, ensuring availability. The switching frequency is fixed at 100kHz (within the operational range of the TOP234PN), and duty cycle is 83%. Operating temperature range is -20°C to 125°C (compared to -40°C to 150°C for the TOP234PN), which may limit use in extreme temperature environments. The STR-A6069H includes additional over-load protection and is suitable for applications where cross-manufacturer sourcing is acceptable.

Frequently Asked Questions (FAQ)

Q: Can TOP254PN directly replace TOP234PN in existing designs?

A: The TOP254PN is the manufacturer-recommended substitute and maintains identical package, voltage rating, power capability, and fault protection. The fixed 66kHz switching frequency (versus the TOP234PN's variable 66kHz–132kHz range) may require transformer design verification. Direct PCB replacement is mechanically feasible due to identical 8-DIP footprint.

Q: What is the difference between TOP245PN and TOP244PN?

A: Both are Power Integrations TOPSwitch®-GX series parts with Not For New Designs status. TOP245PN matches the TOP234PN's 30W power rating and 78% duty cycle, while TOP244PN is rated at 28W with 66.5% duty cycle. TOP245PN provides closer parametric alignment for legacy applications.

Q: Is STR-A6069H suitable for high-temperature applications?

A: The STR-A6069H operates from -20°C to 125°C (junction temperature), which is narrower than the TOP234PN's -40°C to 150°C range. Applications requiring operation above 125°C or below -20°C should use TOP254PN, TOP244PN, or TOP245PN instead.

Q: Are all substitute parts RoHS Compliant?

A: Yes. All substitute parts listed (TOP254PN, TOP244PN, TOP245PN, and STR-A6069H) are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the TOP234PN's environmental compliance.

Q: What is the inventory status of substitute parts?

A: TOP254PN has 20,300 units in stock (Active status). TOP245PN has 2,053 units in stock. TOP244PN has 6,164 units in stock. STR-A6069H has 3,205 units in stock. Availability should be confirmed with the supplier for production quantities.

Q: Can TOP254PN be used in new product designs?

A: Yes. TOP254PN is in Active product status and is the manufacturer-recommended substitute, making it suitable for new designs as a replacement for the obsolete TOP234PN.

Q: Do all substitute parts use the same 8-DIP package?

A: Yes. All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging with 7 leads, enabling direct PCB footprint compatibility with the TOP234PN.

Q: What is the primary reason to substitute TOP234PN?

A: The TOP234PN is classified as Obsolete. Substitution is necessary to ensure long-term component availability, manufacturing continuity, and access to manufacturer technical support. TOP254PN is the recommended path forward due to its Active status and manufacturer endorsement.