FAN5350MPX Equivalent & Substitute Parts

Part Overview

The FAN5350MPX is a buck switching regulator IC manufactured by onsemi, designed for positive fixed 1.82V output applications with 600mA current capability. This component operates across a 2.7V to 5.5V input voltage range and features a 3MHz switching frequency with integrated synchronous rectification. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Voltage (Fixed)	1.82V
Output Current	600mA
Input Voltage Range	2.7V – 5.5V
Switching Frequency	3MHz
Synchronous Rectifier	Yes
Operating Temperature	-40°C to 85°C
Package Type	6-WDFN Exposed Pad
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FAN5350MPX is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 1.82V fixed
Output current capability: 600mA minimum
Input voltage range: Must accommodate 2.7V minimum input
Synchronous rectification: Required
Operating temperature range: -40°C to 85°C
Topology: Buck (step-down) configuration
Output configuration: Positive

Acceptable Variation Parameters:

Switching frequency: May differ from 3MHz
Package type: Alternative surface mount packages acceptable if electrical performance maintained
Minimum input voltage: May be lower than 2.3V (FAN5350MPX specifies 2.7V minimum)

The FAN53601UC182X qualifies as a direct substitute based on matching all critical parameters while offering improved product status (Active) and enhanced specifications in non-critical areas.

Parameter Comparison

Parameter	FAN5350MPX	FAN53601UC182X	Compatibility
Manufacturer	onsemi	onsemi	Match
Function	Step-Down	Step-Down	Match
Output Voltage (Fixed)	1.82V	1.82V	Match
Output Current	600mA	600mA	Match
Input Voltage (Min)	2.7V	2.3V	Compatible (substitute lower)
Input Voltage (Max)	5.5V	5.5V	Match
Switching Frequency	3MHz	6MHz	Compatible (higher frequency acceptable)
Synchronous Rectifier	Yes	Yes	Match
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Match
Product Status	Obsolete	Active	Substitute is current production
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	Match
Package Type	6-WDFN Exposed Pad	6-UFBGA, WLCSP	Different package, PCB layout modification required

Engineering Selection Recommendations

The FAN53601UC182X is the qualified substitute for the obsolete FAN5350MPX based on the following engineering criteria:

Electrical Compatibility: The substitute maintains identical output voltage (1.82V) and current rating (600mA) with full input voltage range coverage. The lower minimum input voltage specification (2.3V vs. 2.7V) provides enhanced flexibility for lower-voltage source applications. The increased switching frequency (6MHz) reduces output filter component size requirements without compromising performance.

Compliance & Certification: Both components maintain ROHS3 compliance and identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring equivalent environmental and regulatory standing.

Product Status Advantage: The FAN53601UC182X is in active production status, providing assured long-term availability and supply chain stability compared to the obsolete FAN5350MPX.

Package Consideration: The substitute employs a 6-UFBGA, WLCSP package (1.23x0.88mm) versus the original 6-WDFN package. This requires PCB layout redesign and thermal management evaluation specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the FAN53601UC182X directly replace the FAN5350MPX without circuit modification?

A: Electrical substitution is valid. However, the package change from 6-WDFN to 6-UFBGA, WLCSP requires PCB layout redesign. Pin-to-pin compatibility cannot be assumed; footprint and thermal pad configuration must be verified against the FAN53601UC182X datasheet.

Q: What is the significance of the 3MHz to 6MHz switching frequency difference?

A: The higher switching frequency of the FAN53601UC182X allows use of smaller output filter inductors and capacitors, potentially reducing board space and component cost. System noise characteristics may differ; EMI filtering requirements should be re-evaluated for the specific application.

Q: Are there any input voltage range limitations when substituting?

A: The FAN53601UC182X accepts input voltages as low as 2.3V, compared to the FAN5350MPX minimum of 2.7V. This represents an improvement. Both parts maintain the same 5.5V maximum input specification. No limitation exists for applications within the original 2.7V to 5.5V range.

Q: What packaging considerations apply to this substitution?

A: The FAN5350MPX uses a 6-WDFN Exposed Pad package (3x3mm), while the FAN53601UC182X uses a 6-UFBGA, WLCSP package (1.23x0.88mm). The substitute is significantly smaller. Thermal pad design, solder reflow profile, and board layout must be adapted to the new package geometry.

Q: Is the FAN53601UC182X available in tape and reel packaging?

A: Yes. The FAN53601UC182X is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Current inventory is 9,608 pieces in new original condition.

Q: Do both parts share the same RoHS and REACH compliance status?

A: Yes. Both the FAN5350MPX and FAN53601UC182X are ROHS3 compliant and REACH unaffected, maintaining identical environmental and regulatory standing.

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