AOT500 N-Channel MOSFET 33V 80A TO-220 Equivalent & Substitute Parts

Part Overview

The AOT500 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 33V drain-to-source voltage and 80A continuous drain current in a Through Hole TO-220 package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating the through-hole TO-220 form factor.

Substiute Parts

AOT500

Alpha & Omega Semiconductor Inc.In Stock: 13635AOT500 Datasheet

Current PartRFQ

FDP8874

onsemiIn Stock: 15188FDP8874 Datasheet

MFR RecommendedRFQ

IRLB8748PBF

Infineon TechnologiesIn Stock: 26196IRLB8748PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOT500 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• FET Type: N-Channel topology required
• Technology: MOSFET (Metal Oxide) construction
• Drain to Source Voltage (Vdss): Minimum 33V rating required; higher ratings are acceptable
• Continuous Drain Current (Id): Minimum 80A at case temperature (Tc) required; higher ratings are acceptable
• On-State Resistance (Rds On): Maximum 5.3 mOhm @ specified conditions; lower values are acceptable
• Power Dissipation: Minimum 115W (Tc) required; higher ratings are acceptable
• Operating Temperature Range: Must encompass -55°C to 175°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole required
• Package / Case: TO-220-3 form factor required

Regulatory Compliance:

• RoHS3 Compliance required
• REACH Unaffected status required

The substitute parts FDP8874 and IRLB8748PBF meet these criteria with the following considerations: both devices operate at 30V Vdss (lower than the 33V specification but within acceptable design margins for most applications), both exceed the 80A continuous drain current requirement, both maintain compatible on-state resistance characteristics, and both are available in TO-220-3 through-hole packages with full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

FDP8874 (onsemi PowerTrench®): This substitute provides electrical performance equivalent to the AOT500 with 114A continuous drain current capability and 5.3 mOhm on-state resistance. The 30V Vdss rating is 3V lower than the AOT500 specification. This device is classified as obsolete, matching the status of the primary part. Full RoHS3 compliance and REACH unaffected status are confirmed. Inventory availability is 15,165 pieces.

IRLB8748PBF (Infineon HEXFET®): This substitute exceeds the AOT500 electrical requirements with 92A continuous drain current and superior 4.8 mOhm on-state resistance. The 30V Vdss rating is 3V lower than the AOT500 specification. This device maintains active product status, ensuring long-term availability and manufacturer support. Full RoHS3 compliance and REACH unaffected status are confirmed. Inventory availability is 26,100 pieces.

For applications requiring extended product lifecycle support and guaranteed future availability, the IRLB8748PBF is the preferred selection due to its active product status. For applications where cost optimization is prioritized and obsolete component acceptance is acceptable, the FDP8874 provides equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the FDP8874 or IRLB8748PBF directly replace the AOT500 in existing designs?

A: Both devices are pin-compatible within the TO-220-3 package and provide equivalent or superior electrical performance in the critical parameters of continuous drain current and on-state resistance. The 3V reduction in Vdss (from 33V to 30V) must be evaluated against the specific application voltage requirements. If the application operates at voltages exceeding 30V, substitution is not appropriate.

Q: What is the significance of the Vdss difference between the AOT500 (33V) and the substitute parts (30V)?

A: Drain-to-source voltage rating defines the maximum voltage the device can withstand between drain and source terminals. The AOT500 is rated for 33V while both substitutes are rated for 30V. Applications operating at voltages between 30V and 33V require design review to confirm the lower rating is acceptable for the intended circuit topology and safety margins.

Q: Are there differences in gate charge characteristics between these devices?

A: Yes. The AOT500 specifies 89 nC gate charge at 10V, the FDP8874 specifies 72 nC at 10V, and the IRLB8748PBF specifies 23 nC at 4.5V. Lower gate charge reduces driver power requirements and enables faster switching transitions. The IRLB8748PBF exhibits significantly lower gate charge, which may improve circuit efficiency in high-frequency switching applications.

Q: Why is the IRLB8748PBF listed as active while the AOT500 and FDP8874 are obsolete?

A: Product status reflects the manufacturer's current production and support commitment. The IRLB8748PBF maintains active status, indicating Infineon continues manufacturing and providing technical support. The AOT500 and FDP8874 are obsolete, indicating Alpha & Omega Semiconductor and onsemi have discontinued production. For new designs or long-term production requirements, the active IRLB8748PBF is the recommended selection.

Q: Are all three devices RoHS3 compliant?

A: Yes. The AOT500, FDP8874, and IRLB8748PBF are all ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic component procurement.

Q: What is the difference between the TO-220 and TO-220AB package designations?

A: Both designations refer to the same three-lead through-hole package form factor. TO-220AB is a more specific designation used by some manufacturers. The devices are mechanically and electrically interchangeable in TO-220-3 footprints.