NCP500SQL33T1G Equivalent & Substitute Parts

Part Overview

The NCP500SQL33T1G is a linear voltage regulator IC from onsemi, delivering a fixed 3.3V output at 150mA in a 6-DFN (2x2.2) surface mount package. This part is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The device features integrated over-current and over-temperature protection with an enable control function, operating across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.23V @ 150mA
Quiescent Current	1 µA
Package Type	6-VDFN Exposed Pad (2x2.2)
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature
Control Features	Enable
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the NCP500SQL33T1G is determined by the following critical parameters:

Fixed output voltage of 3.3V
Positive output configuration with single regulator
Surface mount technology with exposed pad design
Over-current and over-temperature protection capability
Enable control function
RoHS3 compliance and REACH unaffected status

The NCP718AMT330TBG qualifies as a direct substitute based on matching output voltage (3.3V), output configuration (positive fixed), protection features (over-current and over-temperature), control features (enable function), compliance certifications (RoHS3, REACH unaffected), and surface mount packaging with exposed pad. While the substitute offers enhanced specifications in certain parameters, it maintains functional and electrical compatibility within the allowed operating envelope.

Parameter Comparison

Parameter	NCP500SQL33T1G	NCP718AMT330TBG
Output Voltage (Fixed)	3.3V	3.3V
Output Current	150mA	300mA
Input Voltage (Max)	6V	24V
Voltage Dropout (Max)	0.23V @ 150mA	0.44V @ 300mA
Quiescent Current	1 µA	8 µA
PSRR	62dB (1kHz)	60dB (1kHz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C
Package Type	6-VDFN Exposed Pad (2x2.2)	6-WDFN Exposed Pad (2x2)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature
Control Features	Enable	Enable, Soft Start
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The NCP718AMT330TBG is the qualified substitute for the obsolete NCP500SQL33T1G. Selection of this alternative is supported by:

Active product status ensuring long-term availability and supply chain continuity
Identical fixed output voltage (3.3V) and output configuration (positive)
Matching protection architecture (over-current and over-temperature)
Equivalent enable control functionality with additional soft-start feature
Full RoHS3 compliance and REACH unaffected status, maintaining regulatory alignment
Enhanced specifications (higher input voltage rating, extended operating temperature range, increased output current capability) that provide design margin without compromising compatibility

The substitute operates within the same functional class and maintains electrical compatibility for applications originally designed around the NCP500SQL33T1G.

Frequently Asked Questions (FAQ)

Q: Can the NCP718AMT330TBG directly replace the NCP500SQL33T1G in existing designs?

A: Yes. Both devices deliver fixed 3.3V output with identical output configuration, protection features, and control functions. The substitute's enhanced specifications (higher current rating, extended temperature range, increased input voltage tolerance) provide additional design margin without requiring circuit modification.

Q: What are the package differences between these parts?

A: The NCP500SQL33T1G uses a 6-VDFN package (2x2.2mm), while the NCP718AMT330TBG uses a 6-WDFN package (2x2mm). Both are surface mount with exposed pads. Physical footprint differences require PCB layout verification before substitution.

Q: Why does the NCP718AMT330TBG have higher quiescent current?

A: The NCP718AMT330TBG specifies 8 µA quiescent current compared to 1 µA for the NCP500SQL33T1G. This difference reflects the enhanced feature set and higher current capability of the substitute device. For applications where quiescent current is critical, this parameter must be evaluated against system power budget requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the NCP500SQL33T1G and NCP718AMT330TBG are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance for EU and equivalent markets.

Q: What is the significance of the soft-start feature in the substitute?

A: The NCP718AMT330TBG includes soft-start functionality in addition to the enable control present in the original part. This feature reduces inrush current during device startup, providing additional circuit protection without requiring external components.

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