AOD450 N-Channel MOSFET 200V 3.8A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD450 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 200V drain-to-source voltage with 3.8A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as Last Time Buy, indicating discontinued production status. The part operates across a temperature range of -55°C to 175°C and is RoHS3 compliant with unlimited moisture sensitivity level.

Equivalent and substitute parts are necessary due to the Last Time Buy status of the AOD450. Alternative N-Channel MOSFETs with matching or superior electrical characteristics and identical package specifications provide design continuity and supply chain flexibility for applications requiring 200V rated devices in the TO-252 form factor.

Key Parameters

Parameter	AOD450 Value	Unit
FET Type	N-Channel	—
Drain-to-Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	3.8	A (Tc)
On-Resistance (Rds On) @ Id, Vgs	700 mOhm @ 3.8A, 15V	—
Gate Threshold Voltage (Vgs(th)) @ Id	6	V @ 250µA
Gate Charge (Qg) @ Vgs	3.82	nC @ 10V
Input Capacitance (Ciss) @ Vds	215	pF @ 25V
Power Dissipation (Max)	2.1W (Ta), 25W (Tc)	—
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252 (DPAK)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AOD450 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 200V
Package Type: Must be TO-252 (DPAK) or TO-252AA (DPAK) surface mount
FET Type: Must be N-Channel MOSFET
Continuous Drain Current (Id): Must meet or exceed 3.8A at 25°C
Operating Temperature Range: Must support -55°C minimum and 175°C maximum (or equivalent industrial range)
RoHS Compliance: Must be RoHS3 compliant

Secondary Compatibility Parameters:

On-Resistance (Rds On): Lower values indicate improved performance; values up to 800 mOhm are acceptable
Gate Threshold Voltage (Vgs(th)): Range of 2V to 6V is acceptable for logic-level and standard gate drive applications
Gate Charge (Qg): Values up to 23 nC are acceptable; lower values reduce switching losses
Input Capacitance (Ciss): Values up to 500 pF are acceptable; higher values increase gate drive requirements

Substitute parts are grouped into two categories based on current rating capability: parts rated 4.8A to 5.5A (higher current capability) and parts rated 2.6A (lower current capability). All listed substitutes maintain the 200V Vdss rating and TO-252 package specification.

Parameter Comparison

Parameter	AOD450	FDD7N20TM	FQD7N20LTM	IRFR210TRLPBF	IRFR220NTRPBF	IRFR220TRLPBF
Manufacturer	Alpha & Omega	onsemi	onsemi	Vishay Siliconix	Infineon	Vishay Siliconix
Vdss (V)	200	200	200	200	200	200
Id @ 25°C (A)	3.8	5.0	5.5	2.6	5.0	4.8
Rds On (mOhm)	700 @ 3.8A, 15V	690 @ 2.5A, 10V	750 @ 2.75A, 10V	1500 @ 1.6A, 10V	600 @ 2.9A, 10V	800 @ 2.9A, 10V
Vgs(th) (V)	6 @ 250µA	5 @ 250µA	2 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA
Qg (nC)	3.82 @ 10V	6.7 @ 10V	9 @ 5V	8.2 @ 10V	23 @ 10V	14 @ 10V
Ciss (pF)	215 @ 25V	250 @ 25V	500 @ 25V	140 @ 25V	300 @ 25V	260 @ 25V
Power Dissipation (W)	2.1 (Ta), 25 (Tc)	43 (Tc)	2.5 (Ta), 45 (Tc)	2.5 (Ta), 25 (Tc)	43 (Tc)	2.5 (Ta), 42 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 150	-55 to 150	-55 to 150	-55 to 175	-55 to 150
Package	TO-252 (DPAK)	TO-252AA (DPAK)	TO-252AA (DPAK)	DPAK	TO-252AA (DPAK)	DPAK
Product Status	Last Time Buy	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Preferred for Existing Designs):

The IRFR220NTRPBF (Infineon HEXFET®) and IRFR220TRLPBF (Vishay Siliconix) are the closest functional equivalents to the AOD450. Both devices maintain the 200V Vdss rating, support continuous drain currents of 4.8A to 5.0A (exceeding the AOD450's 3.8A specification), and are packaged in TO-252 (DPAK) surface mount form factors. The IRFR220NTRPBF carries Active product status with extended operating temperature range (-55°C to 175°C), matching the AOD450's thermal specification. Both parts are RoHS3 compliant.

Higher Current Capability Alternatives:

The FDD7N20TM (onsemi UniFET™) and FQD7N20LTM (onsemi QFET®) provide increased current handling at 5.0A and 5.5A respectively, with 200V Vdss ratings and TO-252AA (DPAK) packaging. These parts are suitable for applications requiring higher current margins. Both maintain RoHS3 compliance and Active product status. Operating temperature ranges are limited to -55°C to 150°C, which is acceptable for most industrial applications but does not extend to the AOD450's 175°C maximum.

Lower Current Alternative:

The IRFR210TRLPBF (Vishay Siliconix) is rated for 2.6A continuous drain current, below the AOD450's 3.8A specification. This part is suitable only for applications where the lower current rating is acceptable. It maintains 200V Vdss, TO-252 (DPAK) packaging, RoHS3 compliance, and Active product status with -55°C to 150°C operating range.

Compliance and Certification:

All recommended substitutes are RoHS3 compliant and carry REACH Unaffected or Vendor Undefined status. The IRFR220NTRPBF is preferred for new designs requiring extended temperature operation to 175°C. For applications limited to 150°C maximum junction temperature, all onsemi and Vishay alternatives are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the IRFR210TRLPBF replace the AOD450 in all applications?

A: The IRFR210TRLPBF is rated for 2.6A continuous drain current, which is below the AOD450's 3.8A specification. This part is suitable only for applications where the actual operating current does not exceed 2.6A. For applications requiring the full 3.8A capability, higher-rated alternatives such as IRFR220NTRPBF, IRFR220TRLPBF, FDD7N20TM, or FQD7N20LTM must be used.

Q: What is the difference between TO-252 and TO-252AA packaging?

A: Both TO-252 and TO-252AA are DPAK (2 Leads + Tab) surface mount packages with identical mechanical and electrical interfaces. The designations refer to minor manufacturing variations. All listed substitutes are mechanically and electrically compatible with the AOD450's TO-252 footprint.

Q: Why do some substitutes have lower operating temperature maximums (150°C vs. 175°C)?

A: The AOD450 supports junction temperatures up to 175°C. Most onsemi and Vishay alternatives are rated to 150°C maximum. For applications operating near or above 150°C junction temperature, the IRFR220NTRPBF (Infineon) is the preferred substitute, as it maintains the 175°C maximum rating.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed in this document carry RoHS3 Compliant certification, matching the AOD450's compliance status.

Q: What does "Last Time Buy" status mean for the AOD450?

A: Last Time Buy indicates that the AOD450 is no longer in production and existing inventory represents the final available stock. Customers must transition to alternative parts for new designs or future production runs. All recommended substitutes carry Active product status, ensuring long-term availability.

Q: How do gate charge differences affect circuit design?

A: The AOD450 has a gate charge (Qg) of 3.82 nC, while substitutes range from 6.7 nC to 23 nC. Higher gate charge requires greater gate drive current or longer switching times. For applications with fixed gate drive circuits, substitutes with lower gate charge (FDD7N20TM at 6.7 nC, IRFR210TRLPBF at 8.2 nC) minimize switching losses and heat dissipation.

Q: Can I use FQD7N20LTM in place of AOD450 if my application only requires 3.8A?

A: Yes. The FQD7N20LTM is rated for 5.5A continuous drain current, which exceeds the 3.8A requirement. It maintains 200V Vdss, TO-252AA (DPAK) packaging, and RoHS3 compliance. The higher current rating provides design margin without affecting circuit functionality. Operating temperature range is -55°C to 150°C.

Q: What is the significance of on-resistance (Rds On) differences?

A: On-resistance determines conduction losses and heat dissipation. The AOD450 has 700 mOhm Rds On. Substitutes with lower Rds On (FDD7N20TM at 690 mOhm, IRFR220NTRPBF at 600 mOhm) reduce power dissipation and improve efficiency. Substitutes with higher Rds On (IRFR210TRLPBF at 1500 mOhm) increase conduction losses and are suitable only for lower-current applications.

Q: Are packaging dimensions identical across all TO-252 variants?

A: Yes. All TO-252 and TO-252AA DPAK packages share identical PCB footprints and mechanical dimensions. Direct board-level substitution is possible without layout modifications.

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