FDMA8884 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDMA8884 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with continuous drain current of 6.5A (Ta) and 8A (Tc). This device is housed in a 6-MicroFET (2x2) surface mount package and is part of the PowerTrench® series. The FDMA8884 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while accommodating the transition from obsolete to active product status.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	6.5	A
Continuous Drain Current @ 25°C (Tc)	8	A
On-Resistance (Rds On) @ 6.5A, 10V	23	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3	V
Gate Charge (Qg) @ 10V	7.5	nC
Input Capacitance (Ciss) @ 15V	450	pF
Power Dissipation (Max) @ Ta	1.9	W
Operating Temperature Range	-55 to 150	°C
Package Type	6-WDFN Exposed Pad	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FDMA8884 is constrained by the following critical electrical and mechanical parameters:

Electrical Constraints: The FDMA8884 operates at a maximum Vdss of 30V. Substitute parts must support this voltage rating or higher to ensure safe operation in the original circuit topology. The continuous drain current specification of 6.5A (Ta) and 8A (Tc) establishes the minimum current-handling requirement. On-resistance (Rds On) of 23 mOhm at 6.5A and 10V defines the switching efficiency and thermal characteristics. Gate charge (Qg) of 7.5 nC at 10V and input capacitance (Ciss) of 450 pF at 15V determine gate drive requirements and switching speed.

Mechanical Constraints: The FDMA8884 uses a 6-WDFN Exposed Pad surface mount package. Substitute parts must be compatible with surface mount assembly processes and PCB footprints designed for this package type or directly compatible alternatives.

Compliance Constraints: The FDMA8884 is ROHS3 compliant with MSL 1 (Unlimited) and REACH unaffected status. Substitute parts must maintain equivalent compliance certifications to ensure regulatory and supply chain compatibility.

The identified substitute part PMPB15XN,115 is listed in the original part data and represents an alternative from Nexperia USA Inc. with active product status.

Parameter Comparison

Parameter	FDMA8884 (onsemi)	PMPB15XN,115 (Nexperia)	Compatibility Notes
Drain-to-Source Voltage (Vdss)	30 V	20 V	Substitute rated lower; suitable for circuits operating ≤20V
Continuous Drain Current @ 25°C (Ta)	6.5 A	7.3 A	Substitute exceeds minimum requirement
On-Resistance (Rds On)	23 mOhm @ 6.5A, 10V	21 mOhm @ 7.3A, 4.5V	Substitute exhibits lower on-resistance; improved efficiency
Gate Threshold Voltage (Vgs(th))	3 V @ 250µA	900 mV @ 250µA	Substitute has lower threshold; different gate drive characteristics
Gate Charge (Qg)	7.5 nC @ 10V	20.2 nC @ 4.5V	Substitute exhibits higher gate charge; increased drive requirements
Input Capacitance (Ciss)	450 pF @ 15V	1240 pF @ 10V	Substitute has significantly higher input capacitance
Power Dissipation (Max) @ Ta	1.9 W	1.7 W	Substitute rated slightly lower at Ta; higher at Tc (12.5W)
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	Identical operating range
Package Type	6-WDFN Exposed Pad	6-UDFN Exposed Pad	Different package families; footprint verification required
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent compliance
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent handling requirements
Product Status	Obsolete	Active	Substitute offers long-term availability

Engineering Selection Recommendations

PMPB15XN,115 Substitution Criteria:

The PMPB15XN,115 from Nexperia USA Inc. is an active product suitable as a substitute for the obsolete FDMA8884 under the following conditions:

Voltage Rating Limitation: The PMPB15XN,115 is rated for 20V Vdss, which is 10V lower than the FDMA8884. This part is suitable only for circuit applications where the maximum drain-to-source voltage does not exceed 20V. Circuits designed for the full 30V capability of the FDMA8884 cannot use this substitute without circuit redesign.
Current Capability: The PMPB15XN,115 provides 7.3A continuous drain current at 25°C (Ta), exceeding the FDMA8884 requirement of 6.5A. This parameter is compatible.
On-Resistance Performance: The PMPB15XN,115 exhibits 21 mOhm on-resistance at 7.3A and 4.5V, compared to 23 mOhm for the FDMA8884 at 6.5A and 10V. The lower on-resistance of the substitute results in reduced power dissipation and improved thermal performance.
Gate Drive Characteristics: The PMPB15XN,115 has a lower gate threshold voltage (900 mV) and higher gate charge (20.2 nC) compared to the FDMA8884 (3V threshold, 7.5 nC charge). Gate drive circuits must be evaluated for compatibility with these different characteristics.
Package Compatibility: The FDMA8884 uses a 6-WDFN package while the PMPB15XN,115 uses a 6-UDFN package. Although both are 6-pin exposed pad packages, the physical dimensions and footprints differ. PCB layout and assembly tooling must be verified for compatibility.
Regulatory Compliance: Both parts maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and REACH unaffected status, ensuring equivalent supply chain and environmental compliance.
Product Status: The PMPB15XN,115 is active, providing long-term availability and supply security compared to the obsolete FDMA8884.

Frequently Asked Questions (FAQ)

Q: Can the PMPB15XN,115 be used as a direct drop-in replacement for the FDMA8884?

A: No. While both are N-Channel MOSFETs with surface mount packages, the PMPB15XN,115 has a lower maximum Vdss rating (20V vs. 30V), different gate drive characteristics, and uses a different package type (6-UDFN vs. 6-WDFN). Circuit validation and PCB layout modifications are required.

Q: What is the primary limitation of using PMPB15XN,115 as a substitute?

A: The PMPB15XN,115 is rated for a maximum drain-to-source voltage of 20V, which is 10V lower than the FDMA8884. This part is suitable only for applications where the circuit voltage does not exceed 20V.

Q: Are the package dimensions compatible between FDMA8884 and PMPB15XN,115?

A: No. The FDMA8884 uses a 6-WDFN Exposed Pad package, while the PMPB15XN,115 uses a 6-UDFN Exposed Pad package. Although both are 6-pin exposed pad packages, the physical dimensions differ. PCB footprints and assembly processes must be evaluated for each package type.

Q: How do the gate drive requirements differ between these parts?

A: The PMPB15XN,115 has a lower gate threshold voltage (900 mV vs. 3V) and higher gate charge (20.2 nC vs. 7.5 nC). Gate drive circuits designed for the FDMA8884 may require adjustment to properly drive the PMPB15XN,115.

Q: Is the PMPB15XN,115 suitable for high-temperature applications?

A: Both parts operate across the same temperature range (-55°C to 150°C). The PMPB15XN,115 provides higher power dissipation capability at Tc (12.5W vs. 1.9W), making it suitable for thermal management in high-temperature environments.

Q: What compliance certifications apply to the PMPB15XN,115?

A: The PMPB15XN,115 is ROHS3 compliant, has MSL 1 (Unlimited) moisture sensitivity rating, and is REACH unaffected. These certifications match the FDMA8884 and ensure equivalent regulatory and supply chain compatibility.

Q: Why is the FDMA8884 classified as obsolete?

A: The FDMA8884 is listed as obsolete by onsemi. The PMPB15XN,115 from Nexperia is an active product, providing long-term availability and supply security for new designs and production continuity.

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