FPF2142 Equivalent & Substitute Parts

Part Overview

The FPF2142 is a Power Switch/Driver IC featuring a 1:1 P-Channel configuration in a 6-MicroFET (2x2) package. This component operates as a high-side power switch with 200mA maximum output current, designed for general-purpose switching applications with integrated fault protection including current limiting, over-temperature protection, reverse current blocking, and UVLO (Under-Voltage Lock-Out). The FPF2142 is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FPF2142

onsemiIn Stock: 863FPF2142 Datasheet

Current PartRFQ

RT9728BHGQW

Richtek USA Inc.In Stock: 1338RT9728BHGQW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FPF2142 is determined by the following critical parameters:

• Output Configuration: High-side P-Channel switch with 1:1 ratio
• Package Compatibility: 6-WDFN Exposed Pad form factor
• Electrical Interface: Non-inverting On/Off control
• Fault Protection Architecture: Current limiting, over-temperature, reverse current, and UVLO protection
• Load Voltage Range: Minimum 1.8V support required
• Rds On Specification: 120mOhm typical resistance
• Mounting Type: Surface Mount

The RT9728BHGQW qualifies as a substitute based on matching output configuration, package type, protection features, and electrical characteristics. However, differences in current rating, voltage range, and temperature specifications must be evaluated against application requirements.

Parameter Comparison

Engineering Selection Recommendations

The RT9728BHGQW is an active-status substitute for the obsolete FPF2142, offering continued component availability and manufacturing support. Both parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory consistency.

Key considerations for selection:

• Current Capacity: The RT9728BHGQW provides 1.8A output current versus the FPF2142's 200mA. Applications requiring only 200mA operation remain within the substitute's capability envelope.
• Voltage Range: The RT9728BHGQW minimum load voltage is 2.5V, compared to the FPF2142's 1.8V. Designs operating below 2.5V require verification of compatibility.
• Temperature Range: The RT9728BHGQW extends to 125°C junction temperature versus 85°C ambient for the FPF2142, providing enhanced thermal margin in high-temperature environments.
• Current Limiting: The RT9728BHGQW features adjustable current limiting versus the FPF2142's fixed implementation, allowing application-specific protection tuning.
• Moisture Sensitivity: The RT9728BHGQW carries MSL-3 rating (168 hours) compared to MSL-1 (unlimited) for the FPF2142, requiring appropriate storage and handling protocols.

Frequently Asked Questions (FAQ)

Q: Can the RT9728BHGQW directly replace the FPF2142 in all applications?

A: Direct replacement is possible when application load current does not exceed 200mA and minimum load voltage is 2.5V or higher. Applications with lower voltage requirements or requiring the FPF2142's MSL-1 rating require design evaluation.

Q: What is the significance of the different current limiting implementations?

A: The FPF2142 uses fixed current limiting, while the RT9728BHGQW provides adjustable current limiting. Both architectures deliver the required fault protection; the adjustable approach in the RT9728BHGQW permits application-specific threshold configuration.

Q: Are the packages physically identical?

A: Both parts use the 6-WDFN Exposed Pad package with identical footprint and pinout, enabling direct PCB layout compatibility without modification.

Q: What does the MSL-3 rating on the RT9728BHGQW require?

A: MSL-3 (168 hours) specifies maximum moisture exposure time before reflow soldering. Components must be stored in controlled humidity environments and used within the specified timeframe after packaging opening, unlike the FPF2142's unlimited MSL-1 rating.

Q: Is thermal performance equivalent between these parts?

A: The RT9728BHGQW's extended temperature range (-40°C to 125°C junction) and lower on-resistance (120mOhm typical, identical to FPF2142) provide equivalent or superior thermal performance in most applications.