FDB8896 Equivalent & Substitute Parts

Part Overview

The FDB8896 is an N-Channel 30V MOSFET manufactured by onsemi in the PowerTrench® series, housed in a TO-263 (D2PAK) surface mount package. This device is rated for 19A continuous drain current at 25°C ambient temperature and 93A at case temperature, with a maximum power dissipation of 80W. The FDB8896 is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production requirements. Substitute parts must maintain compatibility with the TO-263 (D2PAK) package footprint and deliver equivalent electrical performance within the specified voltage and current operating ranges.

Substiute Parts

FDB8896

onsemiIn Stock: 6999FDB8896 Datasheet

Current PartRFQ

IRF3709ZSTRRPBF

Infineon TechnologiesIn Stock: 3231IRF3709ZSTRRPBF Datasheet

DirectRFQ

PHB66NQ03LT,118

Nexperia USA Inc.In Stock: 1088PHB66NQ03LT,118 Datasheet

SimilarRFQ

PSMN017-30BL,118

Nexperia USA Inc.In Stock: 2850PSMN017-30BL,118 Datasheet

SimilarRFQ

PSMN4R3-30BL,118

Nexperia USA Inc.In Stock: 10797PSMN4R3-30BL,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDB8896 are selected based on the following critical parameters that determine functional equivalence:

Voltage Rating: All substitute parts maintain the 30V Drain to Source Voltage (Vdss) specification, ensuring compatibility with the same circuit voltage domain.

Package Compatibility: All substitute parts use the TO-263 (D2PAK) surface mount package with identical pinout and footprint, enabling direct board-level replacement without layout modifications.

Current Handling Capability: Substitute parts are grouped by their continuous drain current ratings at case temperature (Tc), which must equal or exceed the FDB8896's 93A (Tc) specification to maintain thermal and electrical performance margins.

On-State Resistance (Rds On): Substitute parts are evaluated for Rds On characteristics at 10V gate-source voltage, a standard drive condition. Lower Rds On values indicate improved efficiency and reduced power dissipation.

Operating Temperature Range: All substitute parts support the -55°C to 175°C junction temperature range, ensuring thermal compatibility across the full operating envelope.

Compliance Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original FDB8896.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent - IRF3709ZSTRRPBF (Infineon Technologies):

The IRF3709ZSTRRPBF is the closest functional equivalent to the FDB8896. Both devices share identical 30V Vdss rating, comparable continuous drain current at case temperature (87A versus 93A), and nearly equivalent power dissipation (79W versus 80W). The Rds On specification of 6.3mOhm at 10V gate-source voltage is within acceptable tolerance of the FDB8896's 5.7mOhm. The IRF3709ZSTRRPBF is classified as "Not For New Designs" by Infineon, indicating mature product status with established supply chains. This part is suitable for direct replacement in existing designs requiring the FDB8896.

High-Current Alternative - PSMN4R3-30BL,118 (Nexperia USA Inc.):

The PSMN4R3-30BL,118 offers superior current handling capability at 100A (Tc) and improved on-state resistance of 4.1mOhm at 10V, representing a performance upgrade over the FDB8896. Power dissipation capability is increased to 103W (Tc). This device is classified as Active, ensuring long-term availability and supply continuity. The PSMN4R3-30BL,118 is recommended for new designs or applications requiring enhanced thermal margin and efficiency improvements.

Lower-Current Alternative - PSMN017-30BL,118 (Nexperia USA Inc.):

The PSMN017-30BL,118 maintains the 30V Vdss rating but provides reduced continuous drain current of 32A (Tc) and lower power dissipation of 47W (Tc). This device is suitable only for applications where the FDB8896's full current capability is not required. The higher Rds On specification of 17mOhm at 10V indicates increased power loss. This part is classified as Obsolete.

Voltage-Reduced Alternative - PHB66NQ03LT,118 (Nexperia USA Inc.):

The PHB66NQ03LT,118 operates at a reduced voltage rating of 25V Vdss, which is incompatible with circuits designed for 30V operation. This device is not recommended as a substitute for the FDB8896 in applications requiring the full 30V voltage margin. The part is classified as Obsolete.

Frequently Asked Questions (FAQ)

Q: Can the IRF3709ZSTRRPBF directly replace the FDB8896 without circuit modifications?

A: Yes. The IRF3709ZSTRRPBF shares identical voltage rating (30V), package footprint (D2PAK), and comparable electrical specifications. No circuit modifications are required for direct substitution. Both devices operate across the same temperature range (-55°C to 175°C) and maintain equivalent gate drive requirements.

Q: What is the primary advantage of using PSMN4R3-30BL,118 over the FDB8896?

A: The PSMN4R3-30BL,118 provides improved on-state resistance (4.1mOhm versus 5.7mOhm at 10V), resulting in lower power dissipation and improved thermal efficiency. The higher continuous drain current rating (100A versus 93A at Tc) provides additional design margin. The device is classified as Active, ensuring long-term supply availability.

Q: Why is the PHB66NQ03LT,118 not suitable as a substitute?

A: The PHB66NQ03LT,118 has a reduced voltage rating of 25V Vdss compared to the FDB8896's 30V specification. This voltage reduction creates incompatibility with circuits designed for 30V operation and reduces the safety margin in voltage transient conditions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (IRF3709ZSTRRPBF, PHB66NQ03LT,118, PSMN017-30BL,118, and PSMN4R3-30BL,118) are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original FDB8896.

Q: What is the difference between continuous drain current ratings at Ta (ambient) versus Tc (case)?

A: The FDB8896 specifies 19A at Ta (25°C ambient temperature) and 93A at Tc (case temperature). The Tc rating reflects maximum current under optimal thermal conditions with active heat sinking. Substitute part selection should be based on Tc ratings to ensure adequate thermal performance in the target application.

Q: Can PSMN017-30BL,118 be used in applications previously designed for FDB8896?

A: The PSMN017-30BL,118 is suitable only for applications where continuous drain current requirements do not exceed 32A (Tc). The device's reduced current capability (32A versus 93A) and higher on-state resistance (17mOhm versus 5.7mOhm) make it unsuitable for high-current applications. Thermal analysis is required to confirm compatibility.

Q: What packaging considerations apply to these substitute parts?

A: All substitute parts use the TO-263 (D2PAK) surface mount package with identical pinout and footprint to the FDB8896. Direct board-level replacement is possible without layout modifications. Thermal pad design and PCB copper area should be optimized according to the specific power dissipation requirements of the selected substitute device.

Q: Is the FDB8896 still available for purchase?

A: The FDB8896 is classified as Obsolete. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Migration to an active substitute part such as PSMN4R3-30BL,118 is recommended for new designs and ongoing production support.