NCP433FCT2G Equivalent & Substitute Parts

Part Overview

The NCP433FCT2G is a Power Switch/Driver IC manufactured by onsemi, designed for high-side P-channel switching applications with 1.5A output capability in a compact 4-WLCSP package. This component is classified as Obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part operates across a 1V to 3.6V load voltage range with controlled slew rate and load discharge features, serving general-purpose switching applications in power management circuits.

Key Parameters

Parameter	Value
Manufacturer Part Number	NCP433FCT2G
Manufacturer	onsemi
Category	Power Management (PMIC)
Switch Type	General Purpose
Output Type	P-Channel
Output Configuration	High Side
Number of Outputs	1
Ratio - Input:Output	1:1
Current - Output (Max)	1.5A
Voltage - Load	1V ~ 3.6V
Rds On (Typ)	35mOhm
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	4-UFBGA, WLCSP
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the NCP433FCT2G is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Output Type: P-Channel, High Side configuration
Number of Outputs: 1 (1:1 ratio)
Current Rating: 1.5A maximum output
Voltage - Load: 1V ~ 3.6V operating range
Package Type: 4-WLCSP (UFBGA)
Interface: On/Off, Non-Inverting input
Features: Load Discharge, Slew Rate Controlled

Substitute Categories:

MFR Recommended Substitute (NCP333FCT2G): Manufactured by onsemi with identical functional topology and package footprint. Extends load voltage range to 1.2V ~ 5.5V and operating temperature to -40°C ~ 125°C, with slightly higher Rds On (45mOhm vs. 35mOhm). Active product status ensures long-term availability.
Parametric Equivalents (FPF1504 Series): onsemi IntelliMAX™ series parts (FPF1504BUCX, FPF1504LUCX, FPF1504UCX) maintain identical electrical specifications for load voltage (1V ~ 3.6V), current (1.5A), and operating temperature (-40°C ~ 85°C). Package footprint differs slightly (0.96x0.96 vs. 0.76x0.76), with superior Rds On performance (15mOhm). Packaging variants (Tape & Reel, Cut Tape) accommodate different procurement requirements.

Parameter Comparison

Parameter	NCP433FCT2G (Main)	NCP333FCT2G (MFR Recommended)	FPF1504BUCX (Parametric Equiv.)	FPF1504LUCX (Parametric Equiv.)	FPF1504UCX (Parametric Equiv.)
Manufacturer	onsemi	onsemi	onsemi	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active	Active
Switch Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Output Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Output Configuration	High Side	High Side	High Side	High Side	High Side
Number of Outputs	1	1	1	1	1
Ratio - Input:Output	1:1	1:1	1:1	1:1	1:1
Current - Output (Max)	1.5A	1.5A	1.5A	1.5A	1.5A
Voltage - Load	1V ~ 3.6V	1.2V ~ 5.5V	1V ~ 3.6V	1V ~ 3.6V	1V ~ 3.6V
Rds On (Typ)	35mOhm	45mOhm	15mOhm	15mOhm	15mOhm
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	4-UFBGA, WLCSP (0.76x0.76)	4-UFBGA, WLCSP (0.76x0.76)	4-UFBGA, WLCSP (0.96x0.96)	4-UFBGA, WLCSP (0.96x0.96)	4-UFBGA, WLCSP (0.96x0.96)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Interface	On/Off	On/Off	On/Off	On/Off	On/Off
Input Type	Non-Inverting	Non-Inverting	Non-Inverting	Non-Inverting	Non-Inverting
Features	Load Discharge, Slew Rate Controlled	Load Discharge, Slew Rate Controlled	Load Discharge, Slew Rate Controlled	Load Discharge, Slew Rate Controlled	Load Discharge, Slew Rate Controlled
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

NCP333FCT2G (MFR Recommended): This onsemi part is the manufacturer-recommended substitute for the obsolete NCP433FCT2G. It maintains identical package footprint (0.76x0.76 4-WLCSP) and functional topology, enabling direct PCB compatibility without layout modifications. The extended load voltage range (1.2V ~ 5.5V) and higher operating temperature ceiling (-40°C ~ 125°C) provide enhanced design flexibility. Active product status ensures sustained manufacturing support and supply chain availability. The 10mOhm increase in Rds On (45mOhm vs. 35mOhm) represents a minor performance trade-off acceptable for most general-purpose switching applications. ROHS3 compliance and MSL 1 rating maintain environmental and reliability standards.

FPF1504 Series (Parametric Equivalents): The IntelliMAX™ series parts (FPF1504BUCX, FPF1504LUCX, FPF1504UCX) deliver superior on-resistance performance (15mOhm) with identical electrical specifications for the original load voltage and temperature range. These parts require PCB layout adjustment due to the larger package footprint (0.96x0.96 vs. 0.76x0.76). Selection among FPF1504 variants depends on packaging requirements: FPF1504BUCX (Tape & Reel, 23,341 units in stock), FPF1504LUCX (Cut Tape & Digi-Reel®, 4,051 units), or FPF1504UCX (20,685 units). All three maintain ROHS3 compliance and REACH Unaffected status. The improved Rds On reduces power dissipation and thermal load, beneficial for current-limited or thermally constrained applications.

Frequently Asked Questions (FAQ)

Q: Can NCP333FCT2G be used as a direct replacement for NCP433FCT2G without PCB modifications?

A: Yes. The NCP333FCT2G maintains identical package footprint (0.76x0.76 4-WLCSP) and pinout, enabling direct PCB substitution. No layout changes are required. The extended voltage and temperature specifications provide additional design margin.

Q: What is the primary difference between NCP333FCT2G and the FPF1504 series?

A: The NCP333FCT2G preserves the original 0.76x0.76 package footprint with 45mOhm Rds On. The FPF1504 series offers superior on-resistance (15mOhm) but requires a larger 0.96x0.96 package footprint, necessitating PCB layout redesign. Selection depends on whether footprint compatibility or performance optimization is prioritized.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. NCP333FCT2G, FPF1504BUCX, FPF1504LUCX, and FPF1504UCX are all ROHS3 compliant with MSL 1 rating (except FPF1504UCX, where MSL is not specified). All maintain REACH Unaffected status.

Q: What is the impact of the 10mOhm Rds On difference between NCP433FCT2G (35mOhm) and NCP333FCT2G (45mOhm)?

A: At maximum 1.5A output, the NCP333FCT2G dissipates approximately 101mW (1.5² × 0.045) compared to 79mW for the original part. This 22mW increase is typically negligible in general-purpose switching applications but should be evaluated in thermally constrained designs.

Q: Which FPF1504 variant should be selected for new production?

A: FPF1504BUCX (Tape & Reel packaging) is recommended for high-volume production with 23,341 units in stock. FPF1504LUCX (Cut Tape & Digi-Reel®) accommodates lower-volume or prototype requirements. FPF1504UCX provides an alternative source from Fairchild Semiconductor. All three are electrically identical.

Q: Does the larger FPF1504 package (0.96x0.96) affect circuit performance?

A: Package size does not affect electrical performance. The larger footprint may reduce parasitic inductance slightly, potentially improving high-frequency switching characteristics. PCB layout must accommodate the increased dimensions.

Q: What is the operating temperature difference between NCP333FCT2G and FPF1504 parts?

A: NCP333FCT2G operates to -40°C ~ 125°C (junction temperature), while FPF1504 series parts operate to -40°C ~ 85°C (ambient temperature). For applications requiring extended temperature operation above 85°C ambient, NCP333FCT2G is the appropriate selection.

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