AO4752 N-Channel MOSFET 30V 15A Equivalent & Substitute Parts

Part Overview

The AO4752 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 15A continuous drain current at 25°C. This device is housed in an 8-SOIC surface mount package and features a Schottky body diode. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the primary AO4752 becomes unavailable, when alternative packaging formats are required, or when design specifications allow for components with equivalent electrical performance within defined parameter ranges. The substitute parts listed maintain compatibility with the original design through equivalent voltage ratings, similar current handling capabilities, and identical package footprints.

Substiute Parts

AO4752

Alpha & Omega Semiconductor Inc.In Stock: 20297AO4752 Datasheet

Current PartRFQ

AOSP36326C

Alpha & Omega Semiconductor Inc.In Stock: 80092AOSP36326C Datasheet

MFR RecommendedRFQ

IRF7458TRPBF

Infineon TechnologiesIn Stock: 4397IRF7458TRPBF Datasheet

MFR RecommendedRFQ

IRF7821TRPBF

Infineon TechnologiesIn Stock: 31373IRF7821TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AO4752 is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must maintain a Drain-to-Source Voltage (Vdss) rating of 30V or greater to ensure safe operation within the original design envelope.

Current Handling: Substitute parts must support continuous drain current (Id) ratings of 12A or higher at 25°C. The AO4752 is rated for 15A; substitutes with lower current ratings (such as 12A or 13.6A) remain functionally compatible when circuit design margins accommodate the reduced current capacity.

Package Footprint: All substitute parts must use the 8-SOIC (0.154", 3.90mm width) surface mount package to ensure direct board-level compatibility without layout modifications.

On-Resistance (Rds On): Substitute parts must demonstrate on-resistance values within acceptable operating ranges. The AO4752 specifies 8.8mOhm maximum at 15A and 10V; substitutes with comparable or lower on-resistance values maintain thermal and efficiency characteristics.

Temperature Range: Operating temperature ranges of -55°C to 150°C or greater ensure compatibility with the original design specifications.

Compliance & Status: All substitute parts must maintain ROHS3 compliance and active or equivalent product status to ensure supply chain viability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: IRF7821TRPBF

The IRF7821TRPBF from Infineon Technologies is the preferred substitute for the AO4752. This device maintains active product status, ensuring long-term supply chain availability. It provides 13.6A continuous drain current, which approaches the original 15A specification. The on-resistance of 9.1mOhm at 10V is comparable to the AO4752's 8.8mOhm, maintaining similar thermal performance. The operating temperature range extends to 155°C, exceeding the original specification. All compliance certifications (ROHS3, MSL 1) align with the primary part.

Secondary Substitute: AOSP36326C

The AOSP36326C from Alpha & Omega Semiconductor Inc. provides continuity within the same manufacturer ecosystem. This part is rated for 12A continuous drain current, representing a 20% reduction from the AO4752's 15A specification. The on-resistance of 11mOhm at 10V is slightly higher than the primary part. This substitute is suitable for applications where the 12A current rating provides adequate design margin. Active product status and identical compliance certifications support its use as a secondary option.

Tertiary Substitute: IRF7458TRPBF

The IRF7458TRPBF from Infineon Technologies carries a "Not For New Designs" product status designation. While this device meets voltage and package requirements with 14A continuous drain current and 8mOhm on-resistance at 16V, its discontinued design status limits its suitability for new applications. This part is listed for reference in legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can the AOSP36326C replace the AO4752 in all applications?

A: The AOSP36326C is functionally compatible with the AO4752 in applications where the 12A continuous drain current rating provides adequate design margin. The original AO4752 is rated for 15A; designs operating at or near this maximum current specification require verification that the reduced 12A rating of the AOSP36326C does not violate circuit requirements. Both parts share identical voltage ratings (30V Vdss), package footprints (8-SOIC), and compliance certifications.

Q: What is the significance of the "Not For New Designs" status on the IRF7458TRPBF?

A: The "Not For New Designs" designation indicates that Infineon Technologies has discontinued active development and marketing of this part. While the IRF7458TRPBF remains functionally compatible with the AO4752 from an electrical and mechanical standpoint, its use is restricted to legacy system support and maintenance applications. New designs should prioritize the IRF7821TRPBF or AOSP36326C, both of which carry active product status.

Q: Are all substitute parts pin-compatible with the AO4752?

A: All listed substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width specifications. This ensures mechanical and board-level compatibility without layout modifications. Pin assignments for N-Channel MOSFETs in this package class are standardized; however, circuit designers must verify gate drive voltage compatibility and on-resistance characteristics for their specific application.

Q: How do gate charge differences affect circuit performance?

A: The AO4752 specifies 15nC gate charge at 10V. The IRF7821TRPBF provides 14nC at 4.5V, while the IRF7458TRPBF specifies 59nC at 10V. Lower gate charge values reduce switching losses and allow faster switching transitions with lower gate drive current requirements. The IRF7458TRPBF's significantly higher gate charge (59nC) may require gate driver circuit adjustments to maintain equivalent switching performance. The AOSP36326C matches the AO4752's 15nC specification exactly.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance, indicating conformance to the Restriction of Hazardous Substances Directive. All parts carry MSL 1 (Unlimited) moisture sensitivity level ratings, eliminating moisture-related handling restrictions. REACH status is "REACH Unaffected" for all parts, confirming no regulatory restrictions under the Registration, Evaluation, Authorization and Restriction of Chemicals regulation. ECCN classification is EAR99 for all parts, indicating general commercial availability without export restrictions.

Q: Can input capacitance differences impact gate drive circuit design?

A: Input capacitance (Ciss) varies significantly among substitutes. The AO4752 specifies 605pF at 15V, while the IRF7821TRPBF provides 1010pF and the IRF7458TRPBF specifies 2410pF. Higher input capacitance increases gate charge requirements and may necessitate gate driver adjustments to maintain switching speed and efficiency. The AOSP36326C's 542pF specification is lower than the AO4752, potentially allowing faster switching with reduced gate drive power.

Q: What packaging format differences exist among the substitute parts?

A: The AO4752 is supplied in Tape & Reel (TR) format. The AOSP36326C is available in Cut Tape (CT) and Digi-Reel® formats. The IRF7821TRPBF and IRF7458TRPBF are supplied in Cut Tape (CT) and Digi-Reel® formats. All parts maintain the identical 8-SOIC surface mount package footprint; packaging format differences affect only component handling and assembly logistics, not electrical or mechanical compatibility.