FPF2124 Equivalent & Substitute Parts

Part Overview

The FPF2124 is a Power Switch/Driver IC manufactured by onsemi, designed as a high-side P-channel power switch with 1:1 configuration and 1.5A output capability in SOT-23-5 packaging. The device features adjustable current limiting, over-temperature protection, reverse current protection, and UVLO (Under-Voltage Lock-Out) fault protection, operating across -40°C to 85°C.

The FPF2124 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in power switching topology, output current rating, and fault protection capabilities while accommodating packaging and performance variations.

Key Parameters

Parameter	FPF2124
Switch Type	General Purpose P-Channel High Side
Output Current (Max)	1.5A
Voltage - Load Range	1.8V ~ 5.5V
Rds On (Typical)	125mOhm
Fault Protection	Current Limiting (Adjustable), Over Temperature, Reverse Current, UVLO
Operating Temperature	-40°C ~ 85°C
Package	SOT-23-5 (SC-74A)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the FPF2124 are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Output topology: High-side P-channel switch with 1:1 configuration
Output current rating: 1.5A maximum
Load voltage range compatibility: Minimum 1.8V support required
Fault protection: Current limiting and UVLO mandatory
Operating temperature range: -40°C to 85°C minimum
Surface mount technology
RoHS3 compliance

Substitutes are grouped into two categories:

Parametric Equivalent (Same Package): FPF2125 maintains identical packaging (SOT-23-5), load voltage range (1.8V ~ 5.5V), output current (1.5A), and Rds On specification (125mOhm), with equivalent fault protection features.
Functional Equivalent (Alternative Package): NCP380HMU15AATBG provides equivalent output current (1.5A) and high-side P-channel topology with reduced Rds On (55mOhm) and enhanced features (Enable Input High, Slew Rate Controlled, Status Flag), but operates within a narrower load voltage range (2.5V ~ 5.5V) and uses 6-UDFN packaging.

Parameter Comparison

Parameter	FPF2124	FPF2125	NCP380HMU15AATBG
Manufacturer	onsemi	Fairchild Semiconductor	onsemi
Product Status	Obsolete	Active	Active
Switch Type	General Purpose P-Channel	General Purpose P-Channel	General Purpose P-Channel
Output Configuration	High Side 1:1	High Side 1:1	High Side 1:1
Output Current (Max)	1.5A	1.5A	1.5A
Voltage - Load	1.8V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Rds On (Typical)	125mOhm	125mOhm	55mOhm
Current Limiting	Adjustable	Adjustable	Fixed
Over Temperature Protection	Yes	Yes	No
Reverse Current Protection	Yes	Yes	No
UVLO	Yes	Yes	Yes
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	SOT-23-5	SOT-23-5	6-UDFN (2x2)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FPF2125 Selection Criteria: FPF2125 is the direct parametric equivalent for applications requiring identical electrical performance and package footprint. This part maintains the same SOT-23-5 package, load voltage range (1.8V ~ 5.5V), output current (1.5A), and Rds On specification (125mOhm). FPF2125 is currently in active production status, ensuring supply continuity. The part carries ROHS3 compliance and is suitable for direct PCB layout replacement without design modification.

NCP380HMU15AATBG Selection Criteria: NCP380HMU15AATBG is a functional equivalent for applications where package size reduction and improved on-resistance are beneficial. The 6-UDFN (2x2) package provides a smaller footprint than SOT-23-5. The reduced Rds On (55mOhm versus 125mOhm) improves thermal performance and reduces power dissipation. However, this substitute operates within a narrower load voltage range (2.5V ~ 5.5V minimum versus 1.8V minimum), making it unsuitable for applications requiring sub-2.5V operation. Additionally, NCP380HMU15AATBG uses fixed current limiting rather than adjustable, and lacks over-temperature and reverse current protection features present in the FPF2124. This part is currently in active production status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can FPF2125 be used as a direct replacement for FPF2124? A: Yes. FPF2125 is a parametric equivalent with identical electrical specifications (1.5A output, 125mOhm Rds On, 1.8V ~ 5.5V load voltage range) and package (SOT-23-5). No design changes are required for PCB layout or schematic integration.

Q: What are the key differences between FPF2125 and NCP380HMU15AATBG? A: FPF2125 maintains the original SOT-23-5 package and full fault protection feature set (adjustable current limiting, over-temperature, reverse current protection). NCP380HMU15AATBG uses 6-UDFN packaging with improved Rds On (55mOhm) but operates at minimum 2.5V load voltage (versus 1.8V for FPF2125) and provides fixed current limiting without over-temperature or reverse current protection.

Q: Is NCP380HMU15AATBG suitable for 1.8V applications? A: No. NCP380HMU15AATBG specifies a minimum load voltage of 2.5V. Applications requiring 1.8V operation must use FPF2124 or FPF2125.

Q: Are all substitute parts RoHS3 compliant? A: Yes. FPF2125 and NCP380HMU15AATBG are both ROHS3 compliant, matching the FPF2124 compliance status.

Q: Which substitute part is recommended for new designs? A: FPF2125 is recommended for new designs requiring direct functional and package equivalence. NCP380HMU15AATBG is recommended only when package size reduction and lower on-resistance are design priorities and the 2.5V minimum load voltage requirement is acceptable.

Q: What is the impact of reduced Rds On in NCP380HMU15AATBG? A: Lower Rds On (55mOhm versus 125mOhm) reduces power dissipation and thermal generation during operation, improving efficiency in power-limited applications. However, this benefit applies only within the 2.5V ~ 5.5V load voltage range.

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