AO4822AL MOSFET Equivalent & Substitute Parts

Part Overview

The AO4822AL is a dual N-channel MOSFET array manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage and 8A continuous drain current in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging and product status considerations.

Substiute Parts

AO4822AL

Alpha & Omega Semiconductor Inc.In Stock: 7017AO4822AL Datasheet

Current PartRFQ

AO4822A

Alpha & Omega Semiconductor Inc.In Stock: 210188AO4822A Datasheet

MFR RecommendedRFQ

SI4214DDY-T1-GE3

Vishay SiliconixIn Stock: 45364SI4214DDY-T1-GE3 Datasheet

DirectRFQ

DMN3033LSDQ-13

Diodes IncorporatedIn Stock: 3430DMN3033LSDQ-13 Datasheet

MFR RecommendedRFQ

FDS8978

onsemiIn Stock: 18384FDS8978 Datasheet

MFR RecommendedRFQ

FDS8984

onsemiIn Stock: 27879FDS8984 Datasheet

MFR RecommendedRFQ

SH8KA4TB

Rohm SemiconductorIn Stock: 1432SH8KA4TB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AO4822AL is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Dual N-channel MOSFET configuration
• Minimum Vdss rating of 30V
• Continuous drain current (Id) capability of 8A or greater
• On-resistance (Rds On) not exceeding 23 mOhm at rated current and 10V gate voltage
• Gate threshold voltage (Vgs(th)) between 2.1V and 2.5V at 250µA
• Operating temperature range spanning -55°C to 150°C
• Surface mount package in 8-SOIC or equivalent 8-pin form factor

Secondary Considerations:

• Product status (active status preferred for new procurement; obsolete status acceptable for legacy support)
• RoHS3 compliance and REACH unaffected status
• Moisture sensitivity level MSL 1 (unlimited)

Substitute parts are grouped into two categories: manufacturer-recommended direct replacements (AO4822A, DMN3033LSDQ-13, FDS8978, FDS8984, SH8KA4TB) and alternative qualified substitutes (SI4214DDY-T1-GE3). All listed substitutes meet or exceed the primary electrical criteria and maintain package compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: AO4822A

The AO4822A is the manufacturer-recommended direct replacement for the obsolete AO4822AL. It maintains identical electrical specifications across all critical parameters: 30V Vdss, 8A continuous drain current, 19 mOhm on-resistance at rated conditions, and 2.4V gate threshold voltage. The AO4822A is in active product status with RoHS3 compliance and unlimited moisture sensitivity rating. This part provides seamless design continuity with no circuit modifications required.

Secondary Recommendation: SI4214DDY-T1-GE3

The SI4214DDY-T1-GE3 from Vishay Siliconix offers enhanced performance characteristics suitable for applications requiring higher current capability (8.5A) or improved thermal performance (3.1W maximum power dissipation). This part is active in production status and RoHS3 compliant. The slightly elevated on-resistance (19.5 mOhm) and gate charge (22 nC) remain within acceptable substitution tolerances. The reduced input capacitance (660 pF) may provide switching speed advantages in certain circuit topologies.

Tertiary Recommendation: FDS8984

The FDS8984 from onsemi is an active production part suitable for applications where lower gate charge (13 nC) and reduced input capacitance (635 pF) provide circuit benefits. The continuous drain current rating (7A) is slightly below the AO4822AL specification, requiring verification that application peak current demands do not exceed this limit. On-resistance (23 mOhm) is at the upper tolerance boundary. RoHS3 compliance is confirmed.

Alternative Consideration: DMN3033LSDQ-13

The DMN3033LSDQ-13 from Diodes Incorporated is an active production part with the lowest gate charge (13 nC) and reduced input capacitance (725 pF) among available substitutes. The continuous drain current rating (6.9A) is below the AO4822AL specification and requires application-level verification. This part is suitable only for designs where peak current demands remain below 6.9A.

Not Recommended for New Designs: FDS8978 and SH8KA4TB

The FDS8978 is classified as obsolete and therefore unsuitable for new procurement strategies. The SH8KA4TB carries a "Not For New Designs" status, indicating manufacturer discontinuation intent. Both parts should be reserved for legacy system support only.

Frequently Asked Questions (FAQ)

Q: Can the AO4822A be used as a direct drop-in replacement for the AO4822AL?

A: Yes. The AO4822A is the manufacturer-recommended direct replacement with identical electrical specifications and package configuration. No circuit modifications are required.

Q: What is the primary reason the AO4822AL is obsolete?

A: The AO4822AL is classified as obsolete by the manufacturer. The AO4822A serves as the active production equivalent and is recommended for all new designs and ongoing procurement.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed substitute parts are packaged in 8-SOIC (0.154", 3.90mm width) surface mount configuration, ensuring mechanical compatibility with existing PCB layouts.

Q: Which substitute part offers the best thermal performance?

A: The SI4214DDY-T1-GE3 provides the highest maximum power dissipation rating at 3.1W, compared to 2W for the AO4822AL. The SH8KA4TB also offers 3W maximum power dissipation. Both parts are suitable for applications requiring enhanced thermal headroom.

Q: Can I use the DMN3033LSDQ-13 if my application requires 8A continuous current?

A: No. The DMN3033LSDQ-13 is rated for 6.9A continuous drain current, which is below the AO4822AL specification of 8A. This part is suitable only for applications where continuous current demand does not exceed 6.9A.

Q: What is the significance of the gate charge (Qg) parameter in selecting a substitute?

A: Gate charge affects switching speed and gate drive circuit power consumption. Lower gate charge (13 nC for FDS8984 and DMN3033LSDQ-13) results in faster switching and reduced driver power requirements. Higher gate charge (26 nC for FDS8978) may require stronger gate drive circuits. The AO4822AL specifies 18 nC, placing it in the mid-range.

Q: Are all substitute parts RoHS3 compliant?

A: All active production substitute parts (AO4822A, SI4214DDY-T1-GE3, DMN3033LSDQ-13, FDS8984) are confirmed RoHS3 compliant. The obsolete FDS8978 and "Not For New Designs" SH8KA4TB are also RoHS3 compliant but should not be selected for new designs.

Q: What is the difference between the 8-SOIC and 8-SOP package designations?

A: The SH8KA4TB is designated as 8-SOP in the supplier device package field, though the package/case specification lists 8-SOIC (0.154", 3.90mm width). Both designations refer to equivalent 8-pin surface mount packages with identical physical dimensions and pin configurations, ensuring PCB layout compatibility.

Q: Which substitute part has the lowest on-resistance?

A: The FDS8978 offers the lowest on-resistance at 18 mOhm at 7.5A and 10V gate voltage. However, this part is obsolete. Among active production parts, the AO4822A and SI4214DDY-T1-GE3 both offer 19 mOhm on-resistance, matching the AO4822AL specification.

Q: Can I use multiple substitute parts interchangeably in the same design?

A: Substitution decisions must be based on application-specific requirements. While all listed parts meet the primary electrical criteria, variations in gate charge, input capacitance, and maximum power dissipation may affect circuit performance. Verify that the selected substitute meets all application requirements before implementation.