NCP81071ADR2G Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The NCP81071ADR2G is an active low-side gate driver IC manufactured by onsemi, designed for driving N-Channel MOSFETs in power management applications. This inverting gate driver operates across a 4.5V to 20V supply range and delivers 5A peak output current on both source and sink channels. The device is housed in an 8-SOIC surface mount package and maintains active product status with full RoHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application.

Substiute Parts

NCP81071ADR2G

onsemiIn Stock: 1309NCP81071ADR2G Datasheet

Current PartRFQ

IRS4428STRPBF

Infineon TechnologiesIn Stock: 62449IRS4428STRPBF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NCP81071ADR2G is determined by the following critical parameters:

Mechanical Compatibility: Package type must be 8-SOIC with 0.154" (3.90mm) width to ensure direct PCB footprint compatibility.

Electrical Configuration: Driven configuration must be low-side with independent dual-channel architecture supporting N-Channel MOSFET or IGBT gate driving.

Supply Voltage Range: The substitute must operate within or encompass the 4.5V to 20V supply range. Substitutes with wider ranges (such as 6V to 20V) remain compatible for applications operating within the original specification window.

Output Current Capability: Peak source and sink current ratings must meet or exceed 5A on both channels to maintain equivalent drive strength.

Input Logic Type: Inverting input configuration is the primary requirement. Substitutes offering both inverting and non-inverting modes remain compatible when configured for inverting operation.

Thermal Operating Range: The substitute must support the -40°C to 140°C junction temperature range or wider.

Regulatory Compliance: RoHS3 compliance is mandatory for equivalent substitution.

The IRS4428STRPBF from Infineon Technologies qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (NCP81071ADR2G): Retain the original part for applications requiring maximum peak output current (5A source and sink), fastest switching transitions (8ns rise/fall time), and superior moisture sensitivity performance (MSL 1). The NCP81071ADR2G is the optimal choice for high-current gate drive applications and environments with extended storage or high-humidity exposure.

Substitute Selection (IRS4428STRPBF): The IRS4428STRPBF is suitable for applications where peak output current requirements do not exceed 3.3A sink or 2.3A source, and switching speed tolerance permits 25ns rise/fall times. This substitute offers wider supply voltage tolerance (6V to 20V) and extended operating temperature range (-40°C to 150°C). Both devices maintain identical 8-SOIC packaging, RoHS3 compliance, and low-side gate drive configuration. The IRS4428STRPBF supports both inverting and non-inverting input modes, providing additional design flexibility.

Compliance Verification: Both parts maintain active product status, RoHS3 compliance, REACH unaffected status, and EAR99 export classification. No additional regulatory review is required for direct substitution within the specified electrical and thermal operating windows.

Frequently Asked Questions (FAQ)

Q: Can the IRS4428STRPBF directly replace the NCP81071ADR2G on the PCB?

A: Yes. Both devices use identical 8-SOIC packaging with 0.154" (3.90mm) width, enabling direct footprint compatibility. No PCB layout modifications are required.

Q: What are the key electrical differences between these parts?

A: The primary differences are peak output current (NCP81071: 5A source/sink vs. IRS4428: 2.3A source/3.3A sink) and switching speed (NCP81071: 8ns vs. IRS4428: 25ns rise/fall time). The IRS4428 offers a wider supply voltage range (6V to 20V vs. 4.5V to 20V) and extended temperature range (-40°C to 150°C vs. -40°C to 140°C).

Q: Is the IRS4428STRPBF suitable for my application if I need 5A output current?

A: No. The IRS4428STRPBF maximum sink current is 3.3A and source current is 2.3A. If your application requires the full 5A output capability of the NCP81071ADR2G, the IRS4428STRPBF is not an appropriate substitute.

Q: Can I use the IRS4428STRPBF in a non-inverting configuration?

A: Yes. The IRS4428STRPBF supports both inverting and non-inverting input modes. However, if your circuit design requires inverting operation, configure the device accordingly. The NCP81071ADR2G operates only in inverting mode.

Q: What is the impact of the slower switching speed (25ns vs. 8ns) on my circuit?

A: Slower rise and fall times increase gate charge delivery duration, which may affect MOSFET switching losses and EMI characteristics. Verify that your application's switching frequency and thermal design accommodate the extended transition times of the IRS4428STRPBF before substitution.

Q: Are there any moisture sensitivity concerns with the IRS4428STRPBF?

A: The IRS4428STRPBF has MSL 2 (1 Year) rating, compared to the NCP81071ADR2G MSL 1 (Unlimited). This means the IRS4428STRPBF requires standard moisture-controlled storage and handling procedures with a 1-year floor life limit after bag opening. The NCP81071ADR2G has no floor life restriction.

Q: Do both parts support IGBT gate driving?

A: The NCP81071ADR2G is specified for N-Channel MOSFET driving. The IRS4428STRPBF supports both IGBT and N-Channel MOSFET gate driving, providing broader application flexibility.

Q: Are there any supply voltage range considerations for substitution?

A: The NCP81071ADR2G operates from 4.5V to 20V, while the IRS4428STRPBF operates from 6V to 20V. If your application uses supply voltages between 4.5V and 6V, the NCP81071ADR2G is required. For applications operating at 6V or higher, both parts are compatible.