AOL1440 Equivalent & Substitute Parts

Part Overview

The AOL1440 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 25V drain-to-source voltage with continuous drain current of 21A at Ta and 85A at Tc. The device is housed in an UltraSO-8™ surface mount package and is designed for applications requiring efficient switching and power management in compact form factors.

The AOL1440 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this component.

Substiute Parts

AOL1440

Alpha & Omega Semiconductor Inc.In Stock: 25355AOL1440 Datasheet

Current PartRFQ

CSD16322Q5

Texas InstrumentsIn Stock: 34785CSD16322Q5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOL1440 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Drain-to-Source Voltage (Vdss) must equal or exceed 25V
• Continuous Drain Current (Id) must meet or exceed 21A at Ta and 85A at Tc
• RDS(on) characteristics must support the application's power dissipation requirements
• Gate Threshold Voltage (Vgs(th)) must be compatible with existing gate drive circuitry
• Gate Charge (Qg) and Input Capacitance (Ciss) must not introduce unacceptable switching delays or drive requirements

Mechanical Compatibility Criteria:

• Surface mount package configuration
• Pin configuration compatible with UltraSO-8™ footprint or equivalent power semiconductor package
• Moisture Sensitivity Level (MSL) rating of 1 or better

The CSD16322Q5 from Texas Instruments meets the electrical requirements for drain voltage and continuous drain current while maintaining surface mount compatibility. Differences in RDS(on), gate charge, and package geometry require evaluation against specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

CSD16322Q5 Substitution Assessment:

The CSD16322Q5 is classified as an Active product with current manufacturing support from Texas Instruments, providing supply chain continuity for the obsolete AOL1440. Both devices share identical drain-to-source voltage ratings (25V) and equivalent continuous drain current at Ta (21A), meeting baseline electrical requirements.

The CSD16322Q5 demonstrates superior performance in gate charge (9.7 nC versus 50 nC) and input capacitance (1365 pF versus 2400 pF), resulting in reduced gate drive power requirements and faster switching transitions. The lower gate threshold voltage (1.4V versus 4V) requires verification against existing gate drive circuit design to ensure proper device activation.

The RDS(on) specification of the CSD16322Q5 (5 mOhm @ 20A, 8V) is higher than the AOL1440 (3.2 mOhm @ 20A, 20V), which may increase conduction losses in power-limited applications. The maximum operating temperature of the CSD16322Q5 is 150°C, compared to 175°C for the AOL1440, reducing the thermal margin in high-temperature environments.

Package geometry differs between the UltraSO-8™ (AOL1440) and 8-VSON-CLIP (5x6) (CSD16322Q5), requiring PCB layout modification and thermal management reassessment. Both devices maintain MSL 1 rating and REACH compliance.

Frequently Asked Questions (FAQ)

Q: Can the CSD16322Q5 directly replace the AOL1440 without PCB modifications?

A: No. The CSD16322Q5 uses an 8-VSON-CLIP (5x6) package, while the AOL1440 uses UltraSO-8™. These packages have different footprints, pin configurations, and thermal characteristics. PCB layout redesign is required.

Q: What is the impact of the lower gate threshold voltage in the CSD16322Q5?

A: The CSD16322Q5 has a gate threshold voltage of 1.4V compared to 4V in the AOL1440. This lower threshold requires gate drive circuits to be evaluated for proper device turn-on and turn-off behavior. Existing gate drive designs may require adjustment.

Q: How does the higher RDS(on) of the CSD16322Q5 affect power dissipation?

A: The CSD16322Q5 exhibits 5 mOhm RDS(on) versus 3.2 mOhm for the AOL1440. At 20A continuous current, this results in increased conduction losses. Applications with strict power budget constraints must calculate the additional heat generation and verify thermal management adequacy.

Q: Is the CSD16322Q5 suitable for applications requiring operation above 150°C?

A: No. The CSD16322Q5 maximum operating temperature is 150°C, while the AOL1440 operates to 175°C. Applications requiring sustained operation above 150°C cannot use the CSD16322Q5 as a substitute.

Q: What are the advantages of the CSD16322Q5 over the AOL1440?

A: The CSD16322Q5 offers significantly lower gate charge (9.7 nC versus 50 nC) and input capacitance (1365 pF versus 2400 pF), reducing gate drive power and enabling faster switching. The device is Active with current manufacturing support, ensuring long-term availability. The continuous drain current at Tc is higher (97A versus 85A).

Q: Are both devices compliant with REACH and export regulations?

A: Yes. Both the AOL1440 and CSD16322Q5 are REACH Unaffected and classified under ECCN EAR99, meeting regulatory requirements for commercial applications.

Q: What is the moisture sensitivity level for both devices?

A: Both devices carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage, handling, or assembly processes.