FDMA7632 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDMA7632 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 9A continuous drain current in a 6-MicroFET (2x2) surface mount package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The PowerTrench® series device operates across the industrial temperature range of -55°C to 150°C and is RoHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	9	A (Ta)
On-Resistance (Rds On Max) @ Id, Vgs	19 mOhm @ 9A, 10V	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ Id	3	V @ 250µA
Gate Charge (Qg Max) @ Vgs	13	nC @ 10V
Input Capacitance (Ciss Max) @ Vds	760	pF @ 15V
Power Dissipation (Max)	2.4	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
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 FDMA7632 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 30V
Continuous Drain Current (Id) must support the application requirement; substitutes with lower Id ratings require circuit re-evaluation
On-Resistance (Rds On) characteristics must be compatible with thermal and efficiency requirements
Gate Threshold Voltage (Vgs(th)) must fall within acceptable drive voltage ranges
Gate Charge (Qg) and Input Capacitance (Ciss) affect switching speed and driver requirements
Operating temperature range must span -55°C to 150°C

Mechanical Compatibility Criteria:

Surface mount package with 6-pin configuration
Exposed pad design for thermal management
RoHS3 compliance and MSL 1 rating required for environmental and handling consistency

Substitute Categories:

Category A – Direct Electrical Equivalents (30V Rating): PMPB20ENZ and PMPB20EN,115 maintain the 30V Vdss rating with comparable Rds On characteristics and gate charge specifications. These Nexperia devices operate within the same temperature range and offer active product status with equivalent compliance certifications.

Category B – Reduced Voltage Substitutes (20V Rating): PMPB12UNEAX and PMPB15XN,115 operate at 20V Vdss, representing a voltage derating. These devices are suitable only for applications where the maximum operating voltage does not exceed 20V. Both maintain comparable current handling and thermal characteristics within their voltage class.

Category C – Reduced Current Substitute (5A Rating): CSD17313Q2 from Texas Instruments maintains the 30V Vdss rating but reduces continuous drain current to 5A. This substitute is applicable only to circuits designed for lower current operation.

Parameter Comparison

Parameter	FDMA7632 (Main)	PMPB20ENZ	PMPB20EN,115	PMPB12UNEAX	PMPB15XN,115	CSD17313Q2
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Texas Instruments
Vdss (V)	30	30	30	20	20	30
Id @ 25°C (A)	9 (Ta)	7.2 (Ta)	7.2 (Ta)	7.9 (Ta)	7.3 (Ta)	5 (Tc)
Rds On Max (mOhm)	19 @ 9A, 10V	19.5 @ 7A, 10V	19.5 @ 7A, 10V	18 @ 7.9A, 4.5V	21 @ 7.3A, 4.5V	30 @ 4A, 8V
Vgs(th) Max (V)	3 @ 250µA	2 @ 250µA	2 @ 250µA	0.9 @ 250µA	0.9 @ 250µA	1.8 @ 250µA
Qg Max (nC)	13 @ 10V	10.8 @ 10V	10.8 @ 10V	17 @ 10V	20.2 @ 4.5V	2.7 @ 4.5V
Ciss Max (pF)	760 @ 15V	435 @ 10V	435 @ 10V	1220 @ 10V	1240 @ 10V	340 @ 15V
Power Dissipation Max (W)	2.4 (Ta)	1.7 (Ta), 12.5 (Tc)	1.7 (Ta), 12.5 (Tc)	1.6 (Ta), 12.5 (Tc)	1.7 (Ta), 12.5 (Tc)	2.3 (Ta)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	6-WDFN Exposed Pad	6-UDFN Exposed Pad	6-UDFN Exposed Pad	6-UDFN Exposed Pad	6-UDFN Exposed Pad	6-WDFN Exposed Pad
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (30V, High Current Applications):

PMPB20ENZ and PMPB20EN,115 are the primary substitutes for the FDMA7632. Both devices maintain 30V Vdss rating and deliver 7.2A continuous drain current, representing a 20% reduction from the original 9A specification. These Nexperia devices are active products with full RoHS3 compliance and unlimited MSL rating. The lower gate charge (10.8 nC versus 13 nC) and reduced input capacitance (435 pF versus 760 pF) provide improved switching characteristics. On-resistance remains comparable at 19.5 mOhm. Both devices operate across the full -55°C to 150°C temperature range. PMPB20ENZ offers higher inventory availability (3934 units) compared to PMPB20EN,115 (2000 units).

For Voltage-Derated Applications (20V Maximum):

PMPB12UNEAX and PMPB15XN,115 are suitable substitutes only for circuits where maximum operating voltage does not exceed 20V. PMPB12UNEAX, qualified to AEC-Q101 automotive standards, delivers 7.9A continuous current with 18 mOhm on-resistance and operates across the full temperature range. PMPB15XN,115 provides 7.3A continuous current with 21 mOhm on-resistance. Both devices feature higher input capacitance (1220–1240 pF) and gate charge (17–20.2 nC), resulting in slower switching characteristics than the main part. Inventory for PMPB12UNEAX is limited (1995 units); PMPB15XN,115 availability is constrained (658 units).

For Current-Limited Applications (5A Maximum):

CSD17313Q2 from Texas Instruments maintains 30V Vdss rating with reduced continuous drain current of 5A. This NexFET™ series device features significantly lower gate charge (2.7 nC) and input capacitance (340 pF), enabling faster switching operation. On-resistance increases to 30 mOhm at 4A, 8V. This substitute is applicable only to low-current circuit designs. Inventory availability is high (63270 units). The device operates across the full -55°C to 150°C temperature range with RoHS3 compliance.

Package Considerations:

All substitute parts employ 6-pin surface mount packages with exposed pads. PMPB20ENZ, PMPB20EN,115, PMPB12UNEAX, and PMPB15XN,115 use 6-UDFN Exposed Pad configuration; CSD17313Q2 uses 6-WSON (2x2) configuration. Both package types are mechanically compatible with standard PCB layouts designed for 6-pin MicroFET devices, though thermal performance may vary due to package geometry differences.

Frequently Asked Questions (FAQ)

Q: Can PMPB20ENZ directly replace FDMA7632 in existing designs?

A: PMPB20ENZ is electrically compatible for applications where 7.2A continuous drain current satisfies circuit requirements. The 30V Vdss rating, operating temperature range (-55°C to 150°C), and compliance certifications (RoHS3, MSL 1) match the original specification. The 20% reduction in current rating and lower gate charge require circuit validation to confirm performance adequacy. Package compatibility is confirmed for standard 6-pin MicroFET PCB layouts.

Q: What is the difference between PMPB20ENZ and PMPB20EN,115?

A: PMPB20ENZ and PMPB20EN,115 are electrically identical devices with identical electrical specifications. Both deliver 30V Vdss, 7.2A continuous current, 19.5 mOhm on-resistance, and 10.8 nC gate charge. The designation difference reflects packaging or distribution variants. PMPB20ENZ offers higher inventory availability (3934 units versus 2000 units).

Q: Are the 20V-rated substitutes (PMPB12UNEAX, PMPB15XN,115) suitable for 30V applications?

A: No. These devices are rated for maximum 20V drain-to-source voltage and must not be used in circuits where operating voltage exceeds 20V. Exceeding the Vdss rating results in device failure. These substitutes are applicable only to circuits designed for 20V maximum operation.

Q: How does the CSD17313Q2 differ from the main part?

A: CSD17313Q2 maintains the 30V Vdss rating but reduces continuous drain current to 5A (versus 9A). Gate charge is significantly lower (2.7 nC versus 13 nC), enabling faster switching. On-resistance increases to 30 mOhm. This device is suitable only for low-current applications. The 6-WSON package is mechanically compatible with standard MicroFET layouts.

Q: What are the thermal implications of switching from FDMA7632 to a substitute?

A: Power dissipation specifications differ across substitutes. PMPB20ENZ and PMPB20EN,115 specify 1.7W at Ta and 12.5W at Tc, compared to FDMA7632 at 2.4W (Ta). CSD17313Q2 specifies 2.3W (Ta). Thermal performance depends on circuit current levels, switching frequency, and PCB thermal design. Lower on-resistance values in some substitutes may reduce power dissipation in high-current applications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts—PMPB20ENZ, PMPB20EN,115, PMPB12UNEAX, PMPB15XN,115, and CSD17313Q2—are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original FDMA7632 specification.

Q: What is the impact of different gate charge specifications on circuit design?

A: Gate charge (Qg) determines the charge required to switch the device on or off. FDMA7632 requires 13 nC at 10V. PMPB20ENZ and PMPB20EN,115 require 10.8 nC, reducing gate driver current demand. CSD17313Q2 requires only 2.7 nC, enabling use of lower-power gate drivers. PMPB12UNEAX and PMPB15XN,115 require 17–20.2 nC, increasing gate driver requirements. Gate driver selection must accommodate the substitute device's gate charge specification.

Q: Can substitutes be mixed in the same production run?

A: Mixing substitutes with different electrical characteristics (current rating, on-resistance, gate charge) in the same circuit design is not recommended. Each substitute should be selected based on specific application requirements and validated independently. Production consistency requires standardization on a single substitute part number.

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