FAN5353MPX Equivalent & Substitute Parts

Part Overview

The FAN5353MPX is a buck switching regulator IC from onsemi, designed for positive adjustable output applications with a 3A current capacity. This device operates across a 2.7V to 5.5V input range and delivers adjustable output from 0.8V to 4.95V. The FAN5353MPX is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FAN5353MPX

onsemiIn Stock: 58782FAN5353MPX Datasheet

Current PartRFQ

FAN53526UC00X

Fairchild SemiconductorIn Stock: 32319FAN53526UC00X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FAN5353MPX is determined by the following critical parameters:

• Topology & Function: Buck switching regulator with step-down capability
• Output Configuration: Single positive output
• Current Rating: 3A output current capacity
• Input Voltage Range: 2.7V to 5.5V minimum compatibility
• Output Voltage Range: Adjustable output capability covering 0.8V minimum
• Synchronous Rectification: Integrated synchronous rectifier for efficiency
• Operating Temperature: -40°C to 85°C range
• Surface Mount Packaging: Compatible with automated assembly processes

The FAN53526UC00X qualifies as a substitute based on matching these core electrical and functional parameters, despite differences in output type (programmable vs. adjustable) and package form factor.

Parameter Comparison

Engineering Selection Recommendations

The FAN53526UC00X serves as a functional substitute for the obsolete FAN5353MPX based on equivalent electrical performance across critical parameters: matching 3A output current, compatible input voltage range (2.5V to 5.5V), identical operating temperature range, and integrated synchronous rectification.

The FAN53526UC00X maintains active product status, ensuring continued availability and manufacturing support. Both devices comply with REACH regulations and carry EAR99 ECCN classification. The substitute operates at a lower switching frequency (2.4MHz vs. 3MHz) and supports a lower minimum output voltage (0.6V vs. 0.8V), providing additional design flexibility.

Package form factor differs between the devices: FAN5353MPX uses 12-WFDFN Exposed Pad while FAN53526UC00X uses 15-UFBGA, WLCSP. This difference requires PCB layout and assembly process evaluation during substitution implementation.

Frequently Asked Questions (FAQ)

Q: Can the FAN53526UC00X directly replace the FAN5353MPX without PCB modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (12-WFDFN vs. 15-UFBGA, WLCSP). PCB layout redesign is required. However, the electrical functionality and performance characteristics are compatible.

Q: What is the significance of the output type difference (Adjustable vs. Programmable)?

A: The FAN5353MPX uses external resistor dividers for adjustable output voltage setting. The FAN53526UC00X uses programmable output voltage control. Both methods achieve the required output voltage range, but implementation differs. Design review is necessary to confirm compatibility with existing feedback networks.

Q: Are there compliance or certification concerns when substituting these parts?

A: Both devices are REACH compliant and carry EAR99 ECCN classification. The FAN5353MPX is ROHS3 compliant. Verify RoHS compliance status of the FAN53526UC00X with the supplier for your specific application requirements.

Q: How does the switching frequency difference affect circuit design?

A: The FAN53526UC00X operates at 2.4MHz compared to the FAN5353MPX at 3MHz. This lower frequency may affect output filter component selection and EMI characteristics. Inductor and capacitor values may require recalculation based on the new switching frequency.

Q: What are the moisture sensitivity implications for assembly and storage?

A: Both devices carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard surface mount assembly and storage procedures apply without special moisture control requirements.