IRF7241PBF P-Channel MOSFET 40V 6.2A Equivalent & Substitute Parts

Part Overview

The IRF7241PBF is a P-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 6.2A continuous drain current at 25°C. This device is part of the HEXFET® series and is packaged in an 8-SO surface mount configuration. The IRF7241PBF is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production requirements. Suitable alternatives must maintain compatibility across electrical ratings, thermal characteristics, and mechanical packaging specifications.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	6.2	A
Rds On (Max) @ Id, Vgs	41	mOhm @ 6.2A, 10V
Gate Charge (Qg) (Max) @ Vgs	80	nC @ 10V
Power Dissipation (Max)	2.5	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the IRF7241PBF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

FET Type: P-Channel topology
Drain to Source Voltage (Vdss): 40V minimum rating
Continuous Drain Current (Id): Equal to or greater than 6.2A
Package / Case: 8-SOIC surface mount configuration
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and REACH Unaffected status

Secondary Compatibility Parameters:

Rds On (Max): Lower or equal values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Equal to or greater than 2.5W (Ta)
Vgs(th) and Vgs (Max): Must remain within ±20V gate voltage specification

Substitutes are grouped into two categories: Direct Electrical Equivalents (matching all critical parameters within 8-SOIC package) and Functional Alternatives (meeting electrical requirements with package variations).

Parameter Comparison

Parameter	IRF7241PBF (Main)	FDS4685	AO4443	DMP4050SSS-13	IRF9Z14SPBF	ZXMP3A16N8TA
Manufacturer	Infineon	onsemi	Alpha & Omega	Diodes Inc.	Vishay Siliconix	Diodes Inc.
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss (V)	40	40	40	40	60	30
Id @ 25°C (A)	6.2	8.2	6.0	4.4	6.7	5.6
Rds On (Max) (mOhm)	41 @ 6.2A, 10V	27 @ 8.2A, 10V	42 @ 6A, 10V	50 @ 6A, 10V	500 @ 4A, 10V	40 @ 4.2A, 10V
Qg (Max) (nC)	80 @ 10V	27 @ 5V	22 @ 10V	13.9 @ 10V	12 @ 10V	29.6 @ 10V
Power Dissipation (W)	2.5 (Ta)	2.5 (Ta)	3.1 (Ta)	1.56 (Ta)	3.7 (Ta)	1.9 (Ta)
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 175	-55 to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SO	TO-263 (D2PAK)	8-SO
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Preferred for Drop-In Replacement):

FDS4685 (onsemi PowerTrench®) is the primary recommended substitute. This part maintains 40V Vdss rating, exceeds the 6.2A requirement with 8.2A continuous drain current, and is packaged in 8-SOIC. The FDS4685 demonstrates superior electrical performance with 27mOhm Rds On (versus 41mOhm) and significantly lower gate charge (27nC versus 80nC), resulting in reduced switching losses. Product status is Active with full RoHS3 compliance and REACH Unaffected designation. Inventory availability is substantial at 18,536 pieces.

AO4443 (Alpha & Omega Semiconductor) provides a near-equivalent alternative with 40V Vdss and 6A continuous drain current in 8-SOIC packaging. Rds On specification is 42mOhm, closely matching the IRF7241PBF at 41mOhm. Gate charge is significantly lower at 22nC, improving switching efficiency. Product status is Active with full compliance certifications. Inventory is available at 15,300 pieces.

Tier 2 - Functional Alternatives (Application-Dependent):

DMP4050SSS-13 (Diodes Incorporated) meets the 40V Vdss requirement but provides reduced continuous drain current at 4.4A. This substitute is suitable only for applications where the 6.2A rating is not fully utilized. Rds On is 50mOhm, and gate charge is minimal at 13.9nC. Power dissipation is limited to 1.56W (Ta). Product status is Active with full compliance. Use only when current requirements can be verified as lower than the main part specification.

Tier 3 - Limited Compatibility (Package or Voltage Variation):

IRF9Z14SPBF (Vishay Siliconix) offers higher voltage rating (60V Vdss) and adequate current (6.7A) but uses TO-263 (D2PAK) packaging instead of 8-SOIC. This part is not suitable for direct PCB replacement without layout redesign. Rds On specification is significantly higher at 500mOhm, indicating reduced performance. Use only when higher voltage rating is required and package change is acceptable.

ZXMP3A16N8TA (Diodes Incorporated) has reduced voltage rating (30V Vdss), making it unsuitable for 40V applications. Although current rating (5.6A) is acceptable, the lower voltage specification creates functional incompatibility. This part is not recommended as a substitute for the IRF7241PBF.

Selection Criteria Summary:

For direct replacement: FDS4685 or AO4443
For current-limited applications: DMP4050SSS-13
For higher voltage requirements with package change: IRF9Z14SPBF
All recommended substitutes maintain RoHS3 compliance and REACH Unaffected status

Frequently Asked Questions (FAQ)

Q1: Can FDS4685 be used as a direct replacement for IRF7241PBF?

A: Yes. FDS4685 is a direct substitute meeting all critical electrical parameters. Both devices are P-Channel MOSFETs rated for 40V Vdss in 8-SOIC packaging. FDS4685 exceeds the 6.2A requirement with 8.2A continuous drain current and demonstrates superior performance with lower Rds On (27mOhm versus 41mOhm) and reduced gate charge (27nC versus 80nC). No circuit modifications are required.

Q2: What is the difference between 8-SOIC and 8-SO packaging?

A: 8-SOIC and 8-SO refer to the same package type: 8-pin Small Outline Integrated Circuit with 0.154" (3.90mm) width. These designations are interchangeable in industry documentation. All parts listed maintain this package specification for PCB compatibility.

Q3: Why does IRF9Z14SPBF have higher Rds On than the main part?

A: IRF9Z14SPBF uses TO-263 (D2PAK) packaging, which is a larger discrete package designed for higher power dissipation (43W at Tc). The higher Rds On (500mOhm) reflects the different die design optimized for the larger package format. This part is not recommended for direct replacement due to both package incompatibility and electrical performance degradation.

Q4: Is DMP4050SSS-13 suitable for all applications using IRF7241PBF?

A: No. DMP4050SSS-13 is rated for only 4.4A continuous drain current, compared to the IRF7241PBF specification of 6.2A. This substitute is suitable only for applications where actual drain current remains below 4.4A. Verify application current requirements before selecting this part. Power dissipation is also limited to 1.56W (Ta).

Q5: Do all substitute parts maintain the same operating temperature range?

A: Most substitutes maintain the -55°C to 150°C range. IRF9Z14SPBF extends to -55°C to 175°C, providing wider temperature capability. All parts listed are rated for the minimum -55°C to 150°C specification required by the IRF7241PBF.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (FDS4685, AO4443, DMP4050SSS-13, IRF9Z14SPBF, and ZXMP3A16N8TA) are ROHS3 Compliant with REACH Unaffected status, matching the compliance profile of the IRF7241PBF.

Q7: Why is gate charge (Qg) important for substitution?

A: Gate charge determines switching speed and energy loss during gate transitions. Lower gate charge (measured in nanofarads) reduces switching losses and improves efficiency. FDS4685 (27nC) and AO4443 (22nC) provide significantly lower gate charge than IRF7241PBF (80nC), resulting in improved circuit performance. This is a secondary consideration after electrical ratings are verified.

Q8: Can ZXMP3A16N8TA replace IRF7241PBF in a 40V circuit?

A: No. ZXMP3A16N8TA is rated for only 30V Vdss, making it unsuitable for applications requiring 40V operation. Using this part in a 40V circuit creates functional incompatibility and risk of device failure. This part is not recommended as a substitute.

Q9: What inventory considerations apply to substitute selection?

A: FDS4685 has the highest inventory availability at 18,536 pieces, followed by AO4443 at 15,300 pieces and DMP4050SSS-13 at 15,165 pieces. The original IRF7241PBF has 1,350 pieces available but is discontinued. For long-term production support, FDS4685 or AO4443 are recommended due to Active product status and substantial inventory levels.

Q10: Are there electrical performance trade-offs when substituting?

A: FDS4685 and AO4443 provide equivalent or superior electrical performance compared to IRF7241PBF. FDS4685 offers lower Rds On and gate charge, improving efficiency. AO4443 matches Rds On closely while reducing gate charge. DMP4050SSS-13 trades current capacity for lower gate charge. IRF9Z14SPBF trades on-resistance performance for higher voltage rating and larger package. Select based on application requirements.

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