AON6994 MOSFET Equivalent & Substitute Parts

Part Overview

The AON6994 is a dual N-channel MOSFET array manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with continuous drain current ratings of 19A and 26A at 25°C. The device is housed in an 8-DFN (5x6) surface mount package and features logic level gate operation suitable for low-voltage switching applications.

The AON6994 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute devices must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while preserving the same physical package footprint.

Substiute Parts

AON6994

Alpha & Omega Semiconductor Inc.In Stock: 16789AON6994 Datasheet

Current PartRFQ

AONY36304

Alpha & Omega Semiconductor Inc.In Stock: 814AONY36304 Datasheet

MFR RecommendedRFQ

AONY36354

Alpha & Omega Semiconductor Inc.In Stock: 2039AONY36354 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AON6994 is determined by strict adherence to the following critical parameters:

Mandatory Compatibility Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
• Package Type: Must be 8-DFN (5x6) surface mount configuration
• Configuration: Must be 2 N-Channel dual asymmetrical MOSFET array
• Operating Temperature Range: Must span -55°C to 150°C (TJ)
• Continuous Drain Current: Must support minimum 19A at 25°C ambient temperature
• On-Resistance: Must not exceed 5.2mOhm @ 20A, 10V Vgs to maintain thermal performance equivalence

Acceptable Variation Parameters:

• Gate Charge (Qg): Variation permitted within thermal and switching speed tolerances
• Input Capacitance (Ciss): Variation permitted provided switching characteristics remain within application requirements
• Gate Threshold Voltage (Vgs(th)): Minor variation acceptable within logic level gate specification range
• Maximum Power Dissipation: Enhanced ratings acceptable for improved thermal performance

The substitute parts AONY36304 and AONY36354 meet all mandatory compatibility criteria and are classified as active products, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

AONY36354 Recommendation:

The AONY36354 is the primary substitute for the obsolete AON6994. This device maintains full electrical and mechanical compatibility with the original part while offering active product status and guaranteed long-term availability. The AONY36354 meets all mandatory substitution criteria: identical 30V Vdss rating, 8-DFN (5x6) package configuration, dual N-channel asymmetrical array topology, and -55°C to 150°C operating temperature range. Continuous drain current ratings of 18.5A (Ta) and 27A (Ta) at 25°C ambient temperature satisfy the minimum 19A requirement of the original design. On-resistance specifications of 5.3mOhm and 2.6mOhm @ 20A, 10V Vgs remain within acceptable substitution parameters. The device carries ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and handling specifications of the original part. Tape & Reel packaging ensures compatibility with automated assembly processes.

AONY36304 Alternative:

The AONY36304 serves as an alternative substitute when AONY36354 availability is constrained. This device meets all mandatory electrical and package compatibility requirements with identical 30V Vdss rating and 8-DFN (5x6) surface mount configuration. Continuous drain current ratings of 20A (Ta) and 26A (Ta) at 25°C ambient temperature exceed the original part specifications. On-resistance values of 5.2mOhm and 2.8mOhm @ 20A, 10V Vgs provide equivalent or improved performance. The AONY36304 is classified as an active product with confirmed inventory availability. However, this part does not specify RoHS compliance or MSL rating in the provided documentation. Selection of AONY36304 requires verification of compliance requirements for the target application and end-use market.

Selection Criteria Summary:

For applications requiring documented RoHS3 compliance and MSL 1 rating, AONY36354 is the specified substitute. For applications where compliance documentation is not required or where enhanced current capacity is beneficial, AONY36304 is acceptable. Both devices maintain identical package footprint and pinout compatibility, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the AONY36354 be used as a direct replacement for the AON6994 without circuit modifications?

A: Yes. The AONY36354 maintains identical package configuration (8-DFN 5x6), pinout, and electrical ratings within the specified operating range. No circuit modifications are required for direct substitution.

Q: What is the significance of the continuous drain current ratings listed as "Ta" and "Tc" in the substitute parts?

A: Ta denotes continuous drain current at ambient temperature (25°C), while Tc denotes continuous drain current at case temperature. The AON6994 specifies only ambient temperature ratings (19A, 26A). Substitute parts provide both ambient and case temperature ratings, offering enhanced thermal performance data. For direct substitution, the ambient temperature (Ta) ratings must meet or exceed the original part specifications.

Q: Are there differences in gate charge between the AON6994 and substitute parts that affect circuit performance?

A: The AON6994 specifies 13nC gate charge at 10V Vgs. Substitute parts specify higher gate charge values (20-40nC). Increased gate charge results in longer switching times and higher gate drive power requirements. Circuit designs with marginal gate drive capability may require evaluation of driver output impedance and switching frequency performance.

Q: Does the 8-DFN (5x6) package footprint remain identical across all three parts?

A: Yes. All three parts utilize the 8-DFN (5x6) surface mount package with identical physical dimensions and pinout. PCB layouts and assembly processes require no modification for substitution.

Q: What is the impact of the lower gate threshold voltage (Vgs(th)) in the substitute parts?

A: The AON6994 specifies 2.2V maximum gate threshold voltage. Substitute parts specify 1.9V to 2.2V. Lower threshold voltage improves gate drive efficiency and reduces minimum gate drive voltage requirements. This variation is within acceptable logic level gate operation parameters and does not require circuit redesign.

Q: Why is the AONY36354 preferred over the AONY36304 for new designs?

A: The AONY36354 carries explicit ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity certification, matching the environmental and handling specifications of the original AON6994. The AONY36304 does not specify these compliance attributes in the provided documentation. For applications subject to environmental regulations or requiring documented compliance traceability, AONY36354 is the specified choice.

Q: Can the enhanced power dissipation ratings (21W Tc, 31.5W Tc) of substitute parts be utilized in the original circuit design?

A: The enhanced power dissipation ratings reflect improved thermal performance under case temperature conditions. Original circuit designs based on the 3.1W ambient temperature rating of the AON6994 do not require modification. The substitute parts provide additional thermal margin and improved performance in thermally constrained applications.

Q: What is the relationship between input capacitance (Ciss) variation and circuit switching performance?

A: The AON6994 specifies 820pF input capacitance at 15V Vds. Substitute parts specify 820pF to 1890pF. Increased input capacitance increases gate charge requirements and switching transition times. Circuits with fixed gate drive impedance may experience slightly slower switching transitions with higher Ciss devices. Gate driver output impedance and switching frequency must be evaluated if Ciss variation exceeds application tolerances.