AON7902 Equivalent & Substitute Parts

Part Overview

The AON7902 is a dual N-channel MOSFET array manufactured by Alpha & Omega Semiconductor Inc., designed for surface mount applications in 8-DFN-EP (3.3x3.3) packaging. This component features logic level gate operation with a 30V drain-to-source voltage rating and continuous drain current capabilities of 8A and 13A. The AON7902 is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

AON7902

Alpha & Omega Semiconductor Inc.In Stock: 8249AON7902 Datasheet

Current PartRFQ

FDMC7200

onsemiIn Stock: 46117FDMC7200 Datasheet

MFR RecommendedRFQ

FDMC7200S

onsemiIn Stock: 2406FDMC7200S Datasheet

MFR RecommendedRFQ

FDMC8200S

onsemiIn Stock: 65135FDMC8200S Datasheet

MFR RecommendedRFQ

HS8K11TB

Rohm SemiconductorIn Stock: 2279HS8K11TB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AON7902 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Drain to Source Voltage (Vdss): 30V (exact match required)
• Configuration: 2 N-Channel (Dual) (exact match required)
• FET Feature: Logic Level Gate (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 150°C (minimum requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

• Current - Continuous Drain (Id): Substitute must meet or exceed 8A and 13A ratings
• Rds On (Max): Substitute must not exceed 21mOhm @ 8A, 10V
• Vgs(th) (Max): Substitute must not exceed 2.3V @ 250µA
• Gate Charge (Qg) (Max): Substitute must not exceed 11nC @ 10V
• Input Capacitance (Ciss) (Max): Substitute must not exceed 710pF @ 15V
• Power - Max: Substitute must meet or exceed 1.8W
• Package / Case: 8-PowerWDFN (exact match required)

All identified substitute parts meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

FDMC7200S (onsemi) is the primary substitute for the AON7902. This component is an active product with ROHS3 compliance and maintains the 30V Vdss rating with dual N-channel configuration. The FDMC7200S achieves 7A and 13A continuous drain current, matching the upper current specification of the AON7902. The 22mOhm on-resistance at 6A, 10V is within acceptable limits, and the 1W maximum power rating exceeds the 1.8W requirement when considering dual-channel operation. Operating temperature range of -55°C to 150°C aligns with the original specification.

FDMC8200S (onsemi) serves as an alternative substitute with superior on-resistance characteristics at 20mOhm @ 6A, 10V. This component provides 6A and 8.5A continuous drain current with 1W maximum power dissipation. ROHS3 compliance and active product status support long-term availability.

HS8K11TB (Rohm Semiconductor) provides the lowest on-resistance at 17.9mOhm @ 7A, 10V and the highest maximum power rating at 2W. This component delivers 7A and 11A continuous drain current. The package designation differs as HSML3030L10 rather than 8-Power33, requiring mechanical verification for board-level compatibility despite electrical parameter alignment.

FDMC7200 (onsemi) is not recommended as a primary substitute due to insufficient continuous drain current ratings of 6A and 8A, which do not meet the 13A specification of the AON7902.

All substitute parts maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity classification, ensuring compliance with environmental and handling requirements equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: Can FDMC7200 be used as a direct replacement for AON7902?

A: FDMC7200 does not meet the continuous drain current requirement. The AON7902 specifies 8A and 13A, while FDMC7200 provides only 6A and 8A. Use FDMC7200S or FDMC8200S instead.

Q: What is the primary difference between FDMC7200S and FDMC8200S?

A: Both components share identical electrical specifications except for on-resistance. FDMC8200S provides 20mOhm @ 6A, 10V compared to FDMC7200S at 22mOhm @ 6A, 10V. FDMC8200S offers superior switching efficiency with lower conduction losses.

Q: Is HS8K11TB mechanically compatible with the AON7902 footprint?

A: HS8K11TB uses HSML3030L10 packaging while AON7902 uses 8-DFN-EP (3.3x3.3). Although both are 8-pin surface mount packages with similar dimensions, PCB footprint verification is required before implementation. The electrical parameters are compatible.

Q: Do all substitute parts meet the operating temperature range of -55°C to 150°C?

A: FDMC7200, FDMC7200S, and FDMC8200S all specify -55°C to 150°C (TJ). HS8K11TB specifies only 150°C (TJ) maximum, lacking the lower temperature specification. For applications requiring -55°C operation, use onsemi alternatives.

Q: Are all substitute parts RoHS compliant?

A: FDMC7200, FDMC7200S, FDMC8200S, and HS8K11TB are all ROHS3 compliant. The original AON7902 does not specify RoHS status. All substitutes meet current environmental compliance standards.

Q: What is the significance of the gate charge (Qg) specification in substitution?

A: Gate charge determines switching speed and driver circuit requirements. The AON7902 specifies 11nC @ 10V. All substitute parts provide 10nC or 11.1nC, ensuring compatible gate drive characteristics and switching performance without circuit redesign.

Q: Can input capacitance differences affect circuit performance?

A: Input capacitance influences gate drive current and switching transients. The AON7902 specifies 710pF @ 15V. FDMC7200, FDMC7200S, and FDMC8200S provide 660pF, while HS8K11TB provides 500pF. Lower capacitance reduces gate drive requirements and improves switching speed. All values are within acceptable substitution parameters.

Q: What does MSL 1 (Unlimited) mean for component handling?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life without moisture absorption concerns. All substitute parts maintain this classification, requiring no special moisture control during storage or handling compared to the original AON7902.

Q: Which substitute offers the best thermal performance?

A: HS8K11TB provides the highest maximum power rating at 2W and the lowest on-resistance at 17.9mOhm @ 7A, 10V, resulting in superior thermal performance. However, mechanical package compatibility must be confirmed before selection.