AOB240L N-Channel MOSFET 40V 20A/105A TO-263 Equivalent & Substitute Parts

Part Overview

The AOB240L is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 40V drain-to-source voltage with continuous drain current of 20A at Ta (ambient temperature) and 105A at Tc (case temperature). The device is housed in a Surface Mount TO-263 (D2PAK) package and is designed for applications requiring moderate to high current switching at 40V operating levels.

The AOB240L carries a product status designation of "Not For New Designs," indicating that while the part remains in inventory, it is no longer recommended for new circuit development. This status necessitates identification of active, functionally equivalent alternatives that meet the same electrical and mechanical requirements for ongoing production and maintenance applications.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current @ 25°C (Ta)	20	A
Continuous Drain Current @ 25°C (Tc)	105	A
On-Resistance (Rds On) @ 20A, 10V	2.6	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.2	V
Gate Charge (Qg) @ 10V	72	nC
Input Capacitance (Ciss) @ 20V	3510	pF
Power Dissipation (Tc)	176	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263 (D2PAK)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AOB240L is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 40V
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide Semiconductor)
Package Type: Must be TO-263 (D2PAK) or equivalent Surface Mount D2PAK variant
Operating Temperature Range: Must support -55°C to 175°C minimum
Mounting Type: Must be Surface Mount

Secondary Compatibility Parameters:

Continuous Drain Current (Tc): Substitute must meet or exceed 105A at case temperature
On-Resistance (Rds On): Lower or equal values indicate improved performance
Gate Threshold Voltage (Vgs(th)): Must be compatible with existing gate drive circuitry
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Affects gate drive requirements
Power Dissipation: Higher ratings provide thermal margin

All substitute parts listed meet the primary criteria. Variations in secondary parameters reflect different design approaches and performance characteristics within the 40V N-Channel MOSFET category.

Parameter Comparison

Parameter	AOB240L	AUIRF1404ZSTRL	AUIRL1404ZSTRL	BUK964R1-40E,118	IPB100N04S4H2ATMA1	IPB80N04S403ATMA1	IPB90N04S402ATMA1	IRF2204SPBF	IXTA220N04T2	IXTA300N04T2	IXTA300N04T2-7
Manufacturer	Alpha & Omega	International Rectifier	International Rectifier	Nexperia	Infineon	Infineon	Infineon	Infineon	IXYS	IXYS	IXYS
Vdss (V)	40	40	40	40	40	40	40	40	40	40	40
Id (Tc) (A)	105	160	160	75	100	80	90	170	220	300	300
Rds On (mOhm)	2.6 @ 20A, 10V	3.7 @ 75A, 10V	3.1 @ 75A, 10V	3.5 @ 25A, 10V	2.4 @ 100A, 10V	3.3 @ 80A, 10V	2.1 @ 90A, 10V	3.6 @ 130A, 10V	3.5 @ 50A, 10V	2.5 @ 500mA, 10V	2.5 @ 50A, 10V
Vgs(th) (V)	2.2 @ 250µA	4.0 @ 250µA	2.7 @ 250µA	2.1 @ 1mA	4.0 @ 70µA	4.0 @ 53µA	4.0 @ 95µA	4.0 @ 250µA	4.0 @ 250µA	4.0 @ 250µA	4.0 @ 250µA
Qg (nC)	72 @ 10V	150 @ 10V	110 @ 5V	52.1 @ 5V	90 @ 10V	66 @ 10V	118 @ 10V	200 @ 10V	112 @ 10V	145 @ 10V	145 @ 10V
Ciss (pF)	3510 @ 20V	4340 @ 25V	5080 @ 25V	6650 @ 25V	7180 @ 25V	5260 @ 25V	9430 @ 25V	5890 @ 25V	6820 @ 25V	10700 @ 25V	10700 @ 25V
Power Dissipation (W)	176 (Tc)	200 (Tc)	200 (Tc)	182 (Tc)	115 (Tc)	94 (Tc)	150 (Tc)	200 (Tc)	360 (Tc)	480 (Tc)	480 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-263 (D2PAK)	TO-263AB (D2PAK)	D2PAK	D2PAK	PG-TO263-3-2	PG-TO263-3-2	PG-TO263-3	D2PAK	TO-263AA	TO-263AA	TO-263-7 (IXTA)
Product Status	Not For New Designs	Active	Active	Obsolete	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Product Status):

The following parts are designated as active products and are suitable for new designs and ongoing production applications:

AUIRL1404ZSTRL (International Rectifier HEXFET® Series) — Active status. Provides 160A continuous drain current with 3.1 mOhm on-resistance at 75A, 10V. Gate threshold voltage of 2.7V at 250µA closely matches the AOB240L at 2.2V, minimizing gate drive circuit modifications. Gate charge of 110 nC at 5V is moderate. Packaged in D2PAK with Bulk packaging option.
IPB100N04S4H2ATMA1 (Infineon OptiMOS™ Series) — Active status. Delivers 100A continuous drain current with superior 2.4 mOhm on-resistance at 100A, 10V. Gate threshold voltage of 4.0V requires gate drive circuit verification. Gate charge of 90 nC at 10V is favorable. Tape & Reel packaging available. ROHS3 compliant.
IPB90N04S402ATMA1 (Infineon OptiMOS™ Series) — Active status. Provides 90A continuous drain current with excellent 2.1 mOhm on-resistance at 90A, 10V. Gate threshold voltage of 4.0V requires gate drive verification. Gate charge of 118 nC at 10V. Tape & Reel packaging. ROHS3 compliant.
IXTA220N04T2 (IXYS TrenchT2™ Series) — Active status. Rated for 220A continuous drain current with 3.5 mOhm on-resistance at 50A, 10V. Gate threshold voltage of 4.0V. Gate charge of 112 nC at 10V. Packaged in TO-263AA. ROHS3 compliant. Tube packaging.
IXTA300N04T2 (IXYS TrenchT2™ Series) — Active status. Rated for 300A continuous drain current with 2.5 mOhm on-resistance at 500mA, 10V. Gate threshold voltage of 4.0V. Gate charge of 145 nC at 10V. Packaged in TO-263AA. ROHS3 compliant. Tube packaging.
IXTA300N04T2-7 (IXYS TrenchT2™ Series) — Active status. Identical electrical specifications to IXTA300N04T2 but packaged in TO-263-7 (IXTA) variant with 6 leads plus tab. ROHS3 compliant. Tube packaging.

Secondary Substitutes (Obsolete Product Status):

The following parts meet electrical and mechanical requirements but carry obsolete product status designations:

BUK964R1-40E,118 (Nexperia TrenchMOS™ Series) — Obsolete status. Provides 75A continuous drain current with 3.5 mOhm on-resistance at 25A, 10V. Gate threshold voltage of 2.1V at 1mA is favorable for gate drive compatibility. Gate charge of 52.1 nC at 5V is low. AEC-Q101 automotive qualification. Cut Tape & Digi-Reel® packaging. ROHS3 compliant.
IRF2204SPBF (Infineon HEXFET® Series) — Obsolete status. Rated for 170A continuous drain current with 3.6 mOhm on-resistance at 130A, 10V. Gate threshold voltage of 4.0V. Gate charge of 200 nC at 10V is elevated. ROHS3 compliant.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and operate across the -55°C to 175°C temperature range specified for the AOB240L. All parts are classified as EAR99 for export control purposes and carry HTSUS code 8541.29.0095. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, matching the original device.

Frequently Asked Questions (FAQ)

Q: Can the AOB240L be directly replaced with any of the listed substitutes without circuit modification?

A: Direct replacement is possible for parts with identical package types (TO-263 D2PAK variants). However, gate threshold voltage differences require verification of gate drive circuit compatibility. The AOB240L has Vgs(th) of 2.2V, while most substitutes specify 4.0V. Gate drive voltage and current must be confirmed to ensure proper switching performance.

Q: What is the significance of the different package designations (TO-263AB, TO-263AA, PG-TO263-3-2, TO-263-7)?

A: All listed variants are Surface Mount D2PAK packages with identical pinout and mechanical footprint compatibility. TO-263AB, TO-263AA, and PG-TO263-3-2 are functionally equivalent for PCB mounting. The TO-263-7 (IXTA) variant includes additional leads for enhanced thermal and electrical performance but requires PCB layout modifications. Standard TO-263 footprints accommodate TO-263AB, TO-263AA, and PG-TO263-3-2 variants without redesign.

Q: Why do some substitutes have significantly higher drain current ratings (220A, 300A) compared to the AOB240L (105A)?

A: Higher current ratings reflect improved semiconductor technology and die design. These parts are suitable for applications requiring the AOB240L's 40V rating and can operate at lower currents without performance degradation. Selection should be based on actual circuit current requirements, not maximum ratings. Higher current devices typically offer lower on-resistance, reducing power dissipation.

Q: What is the impact of on-resistance (Rds On) differences on circuit performance?

A: On-resistance directly affects power dissipation and heat generation. Lower Rds On values reduce I²R losses. The AOB240L specifies 2.6 mOhm at 20A, 10V. Substitutes range from 2.1 mOhm (IPB90N04S402ATMA1) to 3.7 mOhm (AUIRF1404ZSTRL). Lower values improve efficiency but may increase switching speed and EMI. Circuit thermal design must accommodate the selected device's power dissipation rating.

Q: Are there compatibility concerns with gate charge (Qg) variations?

A: Gate charge affects gate drive circuit design and switching speed. The AOB240L specifies 72 nC at 10V. Substitutes range from 52.1 nC (BUK964R1-40E,118) to 200 nC (IRF2204SPBF). Higher gate charge requires greater gate drive current or longer switching times. Gate drive circuits must supply sufficient current to charge the gate within the required switching time window. Existing gate drive circuits should be verified for compatibility with the selected substitute's gate charge specification.

Q: What does "Not For New Designs" status mean for the AOB240L?

A: This designation indicates that while the AOB240L remains available in inventory, the manufacturer no longer recommends its use in new circuit development. Existing designs may continue using available stock, but new applications should select from active-status alternatives. This status typically reflects technology obsolescence or manufacturer discontinuation plans.

Q: Which substitute offers the best balance of performance and active product status?

A: Selection depends on specific application requirements. AUIRL1404ZSTRL offers 160A current with favorable gate threshold voltage (2.7V) matching the AOB240L. IPB90N04S402ATMA1 provides excellent on-resistance (2.1 mOhm) with active status. IXTA220N04T2 and IXTA300N04T2 offer higher current ratings with active status. Thermal requirements, gate drive compatibility, and current demands should guide final selection.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitutes are confirmed ROHS3 compliant. The AOB240L is also ROHS3 compliant. REACH status is "REACH Unaffected" for all parts, indicating no restrictions under REACH regulations. All parts carry ECCN classification EAR99 and HTSUS code 8541.29.0095.

Q: What is the difference between Tc (case temperature) and Ta (ambient temperature) current ratings?

A: Tc (case temperature) ratings assume the device case is maintained at 25°C through adequate heat sinking. Ta (ambient temperature) ratings assume operation in 25°C ambient air without active cooling. The AOB240L specifies 20A at Ta and 105A at Tc, reflecting the significant impact of thermal management. Substitutes typically specify Tc ratings, requiring thermal design verification for the intended application.

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