AOD456 N-Channel MOSFET 25V 50A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD456 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 25V drain-to-source voltage with 50A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The AOD456 operates across a temperature range of -55°C to 175°C (TJ) and is suitable for applications requiring moderate voltage and high current switching performance in compact surface mount form factors.

Substiute Parts

AOD456

Alpha & Omega Semiconductor Inc.In Stock: 5437AOD456 Datasheet

Current PartRFQ

FDD8796

Fairchild SemiconductorIn Stock: 16002FDD8796 Datasheet

MFR RecommendedRFQ

FDD8896

Fairchild SemiconductorIn Stock: 43269FDD8896 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AOD456 is determined by compatibility across the following critical parameters: FET type (N-Channel), technology (MOSFET), package format (TO-252 DPAK), mounting type (Surface Mount), and operating temperature range (-55°C to 175°C). Substitute parts must maintain electrical compatibility within the drain-to-source voltage rating, continuous drain current capability, on-resistance characteristics, and gate charge specifications. The identified substitute parts—FDD8796 and FDD8896—share the same package, mounting type, and temperature operating range as the AOD456. Both substitutes are manufactured by Fairchild Semiconductor and carry active product status, ensuring long-term availability and supply chain stability compared to the obsolete AOD456.

Parameter Comparison

Engineering Selection Recommendations

The AOD456 is classified as obsolete, necessitating transition to active product alternatives. Both FDD8796 and FDD8896 are manufactured by Fairchild Semiconductor and maintain active product status, ensuring sustained availability and manufacturing support.

FDD8796 Selection Criteria: The FDD8796 maintains the same 25V drain-to-source voltage rating as the AOD456 and operates within the identical temperature range. This device provides 35A continuous drain current, which is lower than the AOD456's 50A rating. The FDD8796 exhibits superior on-resistance performance (5.7 mOhm versus 6 mOhm) and lower gate threshold voltage (2.5V versus 3V), resulting in improved switching efficiency. Power dissipation capability is significantly enhanced at 88W (Tc) compared to 50W (Tc). The FDD8796 is suitable for applications where the 35A current rating is sufficient and where enhanced thermal performance is beneficial.

FDD8896 Selection Criteria: The FDD8896 provides the highest continuous drain current rating at 94A (Tc), exceeding the AOD456's 50A specification. This device operates at a higher drain-to-source voltage of 30V, providing additional voltage margin. The FDD8896 delivers 80W (Tc) power dissipation capability and maintains the same gate threshold voltage and on-resistance characteristics as the FDD8796. The FDD8896 is appropriate for applications requiring higher current capacity or operating at voltages up to 30V.

Both substitute parts share identical package geometry (TO-252 DPAK), mounting type (Surface Mount), and operating temperature range (-55°C to 175°C), ensuring direct mechanical and thermal compatibility with existing PCB designs. Selection between FDD8796 and FDD8896 depends on specific application current and voltage requirements.

Frequently Asked Questions (FAQ)

Q: Can the FDD8796 directly replace the AOD456 in all applications?

A: The FDD8796 shares the same 25V voltage rating, package, and temperature range as the AOD456. However, the FDD8796 provides 35A continuous drain current compared to the AOD456's 50A rating. Direct substitution is valid only for applications where the circuit current requirement does not exceed 35A. The FDD8796's superior on-resistance (5.7 mOhm) and lower gate threshold voltage (2.5V) may improve switching performance in compatible applications.

Q: What are the key differences between FDD8796 and FDD8896?

A: The primary differences are drain-to-source voltage rating (25V for FDD8796 versus 30V for FDD8896) and continuous drain current (35A for FDD8796 versus 94A for FDD8896). Both devices share identical on-resistance (5.7 mOhm @ 35A, 10V), gate threshold voltage (2.5V @ 250µA), and package format. The FDD8896 is suitable for higher current applications or circuits operating at voltages up to 30V.

Q: Are the substitute parts pin-compatible with the AOD456?

A: Yes. Both FDD8796 and FDD8896 utilize the TO-252 (DPAK) package with identical pin configuration (2 Leads + Tab, SC-63). No PCB layout modifications are required for mechanical substitution.

Q: What is the impact of higher gate charge in the substitute parts?

A: The FDD8796 exhibits 52 nC gate charge compared to the AOD456's 38 nC, and the FDD8896 exhibits 60 nC. Higher gate charge requires increased driver current or extended switching time. Circuit designs with current-limited gate drivers may experience slower switching transitions. Evaluation of gate driver capability is necessary when substituting into existing designs.

Q: Do the substitute parts maintain the same operating temperature range?

A: Yes. Both FDD8796 and FDD8896 operate across the identical temperature range of -55°C to 175°C (TJ) as the AOD456, ensuring thermal compatibility in existing applications.

Q: What compliance certifications apply to the substitute parts?

A: Both FDD8796 and FDD8896 carry ECCN classification EAR99 and maintain REACH compliance status consistent with the AOD456. The FDD8896 carries HTSUS code 8542.39.0001, while the FDD8796 and AOD456 share HTSUS code 8541.29.0095.