FAN604MX Equivalent & Substitute Parts

Part Overview

The FAN604MX is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 10-SOIC package device operates across a 6V to 25V supply range with switching frequencies between 18.5kHz and 130kHz. The product is currently obsolete, making equivalent substitute parts necessary for new designs or production continuity. The FAN604MX provides over-temperature and over-voltage fault protection suitable for offline flyback topology applications.

Substiute Parts

FAN604MX

onsemiIn Stock: 2545FAN604MX Datasheet

Current PartRFQ

NCP1342AMDCDAD1R2G

onsemiIn Stock: 155436NCP1342AMDCDAD1R2G Datasheet

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NCP1342ANDBDD1R2G

onsemiIn Stock: 10445NCP1342ANDBDD1R2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FAN604MX is determined by the following critical parameters:

Topology Match: Both substitute parts maintain flyback converter topology with isolated output, matching the core functional requirement.

Package Compatibility: Substitute parts use 9-SOIC configuration within the same 10-SOP (0.154", 3.90mm Width) package family, maintaining PCB layout compatibility.

Supply Voltage Range: Substitute parts operate at 9V ~ 28V, which encompasses the FAN604MX operating range of 6V ~ 25V, ensuring compatibility with existing power supply designs.

Switching Frequency: Substitute parts operate at 500kHz fixed frequency, compared to the FAN604MX variable range of 18.5kHz ~ 130kHz. This represents a functional shift to higher frequency operation.

Fault Protection: Substitute parts provide enhanced protection including current limiting, overload, and short circuit protection, exceeding the FAN604MX protection set.

Product Status: Both substitute parts are active products with current manufacturing and availability, addressing the obsolescence of the FAN604MX.

Parameter Comparison

Engineering Selection Recommendations

Both NCP1342AMDCDAD1R2G and NCP1342ANDBDD1R2G are active onsemi products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for new designs. The NCP1342ANDBDD1R2G provides additional control features including enable (EN) and synchronization (Sync) capabilities compared to NCP1342AMDCDAD1R2G, offering greater design flexibility for applications requiring dynamic control.

The transition from the FAN604MX to either NCP1342 variant requires design validation due to the fixed 500kHz switching frequency versus the variable frequency range of the original part. The enhanced fault protection suite in both substitutes provides improved system reliability. The reduced operating temperature maximum of 125°C versus 150°C for the FAN604MX must be evaluated against thermal design requirements.

Frequently Asked Questions (FAQ)

Q: Can NCP1342AMDCDAD1R2G and NCP1342ANDBDD1R2G be used interchangeably with FAN604MX?

A: Both parts share the same flyback topology, isolated output, package family, and supply voltage compatibility. The primary design consideration is the fixed 500kHz switching frequency compared to the FAN604MX variable range. Transformer and filter component designs must be re-evaluated for the higher fixed frequency.

Q: What is the difference between NCP1342AMDCDAD1R2G and NCP1342ANDBDD1R2G?

A: Both parts operate identically in core functionality. NCP1342ANDBDD1R2G includes additional control features: enable (EN) input and synchronization (Sync) capability, providing enhanced design flexibility for applications requiring dynamic power management or clock synchronization.

Q: Are the substitute parts pin-compatible with FAN604MX?

A: The substitute parts use 9-SOIC configuration within the same 10-SOP package family. The FAN604MX uses 10 leads while substitutes use 9 leads. PCB layout must be verified for lead assignment compatibility before implementation.

Q: What is the impact of the lower maximum operating temperature on the NCP1342 variants?

A: The NCP1342 series maximum junction temperature is 125°C compared to 150°C for FAN604MX. Thermal design analysis is required to confirm the substitute part operates within acceptable temperature limits for the target application.

Q: Do the substitute parts meet the same compliance standards as FAN604MX?

A: Yes. Both NCP1342AMDCDAD1R2G and NCP1342ANDBDD1R2G are ROHS3 compliant and REACH unaffected, matching the FAN604MX compliance profile. The NCP1342 variants have improved moisture sensitivity level (MSL 1 vs MSL 3), reducing handling and storage constraints.