FAN2011MPX Equivalent & Substitute Parts

Part Overview

The FAN2011MPX is a buck switching regulator IC manufactured by onsemi, designed for positive adjustable step-down voltage regulation with 1.5A output current capability. This component features a 6-WDFN exposed pad package and operates across an input voltage range of 4.5V to 5.5V with adjustable output from 0.8V to 5.5V at 1.3MHz switching frequency.

The FAN2011MPX is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for applications currently utilizing this regulator.

Key Parameters

Parameter	FAN2011MPX
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	5.5V
Voltage - Output (Min/Fixed)	0.8V
Voltage - Output (Max)	5.5V
Current - Output	1.5A
Frequency - Switching	1.3MHz
Synchronous Rectifier	Yes
Operating Temperature	0°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	6-WDFN Exposed Pad
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FAN2011MPX is determined by the following critical parameters:

Topology & Function: Buck switching regulator with step-down capability
Output Configuration: Positive adjustable output
Electrical Specifications: 1.5A output current, adjustable output voltage range 0.8V to 5.5V
Input Voltage Range: Minimum 4.5V input compatibility
Switching Frequency: Operation in the 1.3MHz to 1.6MHz range
Synchronous Rectification: Integrated synchronous rectifier required
Mounting & Package: Surface mount technology with exposed pad thermal management

The ISL8009AIRZ-T meets these substitution criteria while offering extended input voltage range (2.7V minimum) and broader operating temperature range (-40°C to 85°C), making it a compatible alternative for applications currently using the FAN2011MPX.

Parameter Comparison

Parameter	FAN2011MPX (onsemi)	ISL8009AIRZ-T (Intersil)
Function	Step-Down	Step-Down
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Number of Outputs	1	1
Voltage - Input (Min)	4.5V	2.7V
Voltage - Input (Max)	5.5V	5.5V
Voltage - Output (Min/Fixed)	0.8V	0.8V
Voltage - Output (Max)	5.5V	5.5V
Current - Output	1.5A	1.5A
Frequency - Switching	1.3MHz	1.6MHz
Synchronous Rectifier	Yes	Yes
Operating Temperature	0°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	6-WDFN Exposed Pad	8-VFDFN Exposed Pad
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ISL8009AIRZ-T is an active product with current manufacturer support, addressing the obsolescence status of the FAN2011MPX. Both components share identical output current (1.5A), adjustable output voltage range (0.8V to 5.5V), and synchronous rectification architecture.

The ISL8009AIRZ-T provides enhanced specifications including lower minimum input voltage (2.7V versus 4.5V) and extended operating temperature range (-40°C to 85°C versus 0°C to 85°C). The switching frequency difference (1.6MHz versus 1.3MHz) falls within acceptable tolerance for buck regulator applications and may provide improved efficiency characteristics.

Package differences exist: the FAN2011MPX uses 6-WDFN while the ISL8009AIRZ-T uses 8-VFDFN. PCB layout modifications and thermal management evaluation are required during substitution. Both packages include exposed pads for thermal dissipation.

Compliance certifications (ECCN: EAR99, HTSUS: 8542.39.0001) are identical for both components.

Frequently Asked Questions (FAQ)

Q: Can the ISL8009AIRZ-T directly replace the FAN2011MPX without circuit modifications?

A: The ISL8009AIRZ-T is electrically compatible for output voltage and current specifications. However, package differences (6-WDFN to 8-VFDFN) require PCB layout redesign. Pin configuration and feedback network compatibility must be verified against device datasheets before implementation.

Q: What are the key differences between these two regulators?

A: Both devices share identical 1.5A output current and 0.8V to 5.5V adjustable output range. The ISL8009AIRZ-T offers lower minimum input voltage (2.7V), wider operating temperature range (-40°C to 85°C), and higher switching frequency (1.6MHz). The ISL8009AIRZ-T is an active product with ongoing manufacturer support.

Q: Are there thermal management considerations when substituting packages?

A: Both packages include exposed pads for thermal dissipation. The 8-VFDFN package of the ISL8009AIRZ-T has different thermal characteristics than the 6-WDFN. Thermal analysis and PCB copper area design must be re-evaluated for the target application to ensure adequate heat dissipation at 1.5A output current.

Q: What is the impact of the switching frequency difference?

A: The ISL8009AIRZ-T operates at 1.6MHz compared to the FAN2011MPX at 1.3MHz. This 300kHz difference typically results in smaller output filter components and may improve transient response. Input and output filter designs should be recalculated for the higher frequency.

Q: Are compliance certifications maintained with this substitution?

A: Both components share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, maintaining compliance status for export and tariff purposes.

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