NX2124CSTR Equivalent & Substitute Parts

Part Overview

The NX2124CSTR is a buck regulator positive output step-down DC-DC controller IC manufactured by Microchip Technology in an 8-SOIC surface mount package. This device functions as a transistor driver for step-down voltage conversion applications with a single output phase and 1.0 output configuration. The NX2124CSTR is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

NX2124CSTR

Microchip TechnologyIn Stock: 5831NX2124CSTR Datasheet

Current PartRFQ

NCP3020ADR2G

onsemiIn Stock: 19633NCP3020ADR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NX2124CSTR is determined by equivalence across the following critical parameters:

Topology and Function: Both the main part and substitute must operate as buck (step-down) regulators with transistor driver output type and positive output configuration.

Output Configuration: Single output, single phase operation is required for direct substitution.

Switching Frequency: 300kHz switching frequency must be maintained for circuit timing compatibility.

Duty Cycle: Maximum 84% duty cycle specification must be met or exceeded.

Synchronous Rectifier: Presence of synchronous rectifier functionality must be maintained.

Package and Mounting: 8-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm width) is mandatory for PCB compatibility.

Operating Temperature Range: -40°C to 125°C junction temperature range must be supported.

Supply Voltage Range: The substitute part must accommodate the input voltage requirements of the application circuit.

Parameter Comparison

Engineering Selection Recommendations

The NCP3020ADR2G manufactured by onsemi is a direct functional equivalent to the obsolete NX2124CSTR. Both devices share identical topology, switching frequency, duty cycle rating, synchronous rectifier capability, package form factor, and operating temperature range.

The NCP3020ADR2G holds active product status, ensuring ongoing availability and manufacturer support. This part is RoHS3 compliant, providing environmental and regulatory compliance for new designs and production runs.

The primary design consideration is the supply voltage range difference. The NCP3020ADR2G operates from 4.7V to 28V, compared to the NX2124CSTR range of 2V to 25V. Applications requiring operation below 4.7V input voltage cannot use the NCP3020ADR2G as a direct substitute without circuit redesign.

For applications operating within the 4.7V to 25V input voltage window, the NCP3020ADR2G provides full functional equivalence with improved long-term availability and compliance status.

Frequently Asked Questions (FAQ)

Q: Can the NCP3020ADR2G replace the NX2124CSTR in all applications?

A: The NCP3020ADR2G is functionally equivalent for applications where the input supply voltage remains between 4.7V and 25V. Applications requiring operation below 4.7V input voltage require alternative solutions or circuit modification.

Q: Are the package dimensions identical between these parts?

A: Yes. Both the NX2124CSTR and NCP3020ADR2G use the 8-SOIC package with 0.154" width and 3.90mm width specification. PCB footprints are directly compatible.

Q: What is the significance of the NX2124CSTR being obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. The NCP3020ADR2G active status ensures continued availability, technical documentation, and manufacturing consistency for new production requirements.

Q: Do both parts support the same switching frequency?

A: Yes. Both devices operate at 300kHz switching frequency, maintaining circuit timing and control loop compatibility.

Q: What compliance differences exist between these parts?

A: The NCP3020ADR2G is RoHS3 compliant, while the NX2124CSTR compliance status is not specified in available documentation. Both parts are REACH unaffected and classified under ECCN EAR99.

Q: Are there moisture sensitivity differences?

A: Yes. The NX2124CSTR has MSL 1 (unlimited moisture exposure), while the NCP3020ADR2G has MSL 3 (168 hours maximum moisture exposure). The NCP3020ADR2G requires standard moisture control during storage and handling.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, provided the application input voltage range is compatible with the NCP3020ADR2G minimum 4.7V specification. Identical package dimensions and pinout compatibility enable direct substitution at the component level.