PFS728EG Power Factor Correction Controller - Equivalent & Substitute Parts

Part Overview

The PFS728EG is a Power Factor Correction (PFC) controller IC manufactured by Power Integrations, operating in Continuous Conduction Mode (CCM) with a switching frequency range of 24kHz to 95kHz. This device is packaged in a 7-lead eSIP format with through-hole mounting and is designed for power management applications requiring active power factor correction.

The PFS728EG has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this controller.

Substiute Parts

PFS728EG

Power IntegrationsIn Stock: 12196PFS728EG Datasheet

Current PartRFQ

PFS7538H

Power IntegrationsIn Stock: 764PFS7538H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PFS728EG is determined by the following critical parameters:

Functional Compatibility Criteria:

• Operating mode must be Continuous Conduction (CCM)
• Manufacturer must be Power Integrations (HiperPFS™ series)
• Both devices must function as PFC controller ICs

Electrical Compatibility Criteria:

• Supply voltage range must accommodate the original specification (10V ~ 12V)
• Switching frequency range must overlap or extend the original range (24kHz ~ 95kHz)
• Operating temperature range must meet or exceed the original specification (-40°C ~ 125°C)

Mechanical Compatibility Criteria:

• Mounting type must be through-hole
• Package must provide equivalent or superior lead count and thermal characteristics
• Pin configuration must support circuit board integration

The PFS7538H qualifies as a substitute based on these parameters: it operates in CCM mode within the HiperPFS™ series, maintains through-hole mounting, and provides extended electrical specifications that encompass the original device's operating range.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The PFS7538H is electrically and functionally compatible with the PFS728EG as a substitute for PFC controller applications. Both devices operate within the HiperPFS™ series using CCM topology, maintain identical RoHS and MSL compliance, and share the same through-hole mounting methodology.

Critical Design Consideration:

The PFS7538H utilizes a 16-lead eSIP-16D package compared to the 7-lead eSIP-7G package of the original PFS728EG. This package difference requires printed circuit board redesign to accommodate the increased lead count and modified pin layout. Direct socket replacement is not possible without circuit board modification.

Electrical Advantages of Substitution:

The PFS7538H provides extended operating specifications: switching frequency range extends to 123kHz (versus 95kHz maximum), supply voltage tolerance extends to 15V (versus 12V maximum), and operating temperature range extends to 150°C (versus 125°C maximum). These extended parameters provide design margin for applications operating at thermal or electrical extremes.

Supply Chain Status:

The PFS728EG is obsolete with limited remaining inventory. The PFS7538H is in active production status, ensuring long-term availability and supply chain continuity for new designs and production support.

Frequently Asked Questions (FAQ)

Q: Can the PFS7538H be used as a direct replacement for the PFS728EG without circuit board modification?

A: No. The PFS7538H uses a 16-lead eSIP-16D package versus the 7-lead eSIP-7G package of the PFS728EG. Direct socket replacement is not possible. Circuit board redesign is required to accommodate the different package footprint and pin configuration.

Q: What are the key electrical differences between these two controllers?

A: The PFS7538H provides extended operating ranges: switching frequency extends from 24kHz~95kHz to 22kHz~123kHz, supply voltage extends from 10V~12V to 10.2V~15V, and operating temperature extends from -40°C~125°C to -40°C~150°C. Both operate in CCM mode within the HiperPFS™ series.

Q: Are both devices RoHS compliant?

A: Yes. Both the PFS728EG and PFS7538H are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity level, meeting identical environmental and regulatory requirements.

Q: Why is the PFS728EG listed as obsolete?

A: The PFS728EG has reached end-of-life status in Power Integrations' product portfolio. The PFS7538H represents the active-production successor within the HiperPFS™ controller family, offering enhanced specifications and continued manufacturing support.

Q: What design considerations apply when transitioning from PFS728EG to PFS7538H?

A: Primary considerations include: (1) PCB layout redesign for the 16-lead package, (2) verification that extended electrical specifications (higher frequency, voltage, and temperature ranges) are compatible with existing circuit design, and (3) validation of the increased lead count for thermal and electrical performance in the target application.

Q: Are there inventory considerations for the PFS728EG?

A: Yes. The PFS728EG is obsolete with limited remaining stock (12,100 pieces reported). The PFS7538H is in active production with ongoing availability, making it the recommended choice for new designs and long-term production support.