IRFS7434PBF N-Channel 40V 195A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFS7434PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 195A continuous drain current at 25°C. The device is housed in a D2PAK (TO-263-3) surface mount package and is part of the HEXFET® and StrongIRFET™ series. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain compatibility with the 40V voltage class, D2PAK package format, and surface mount assembly requirements while accommodating variations in current rating and thermal characteristics.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	195	A (Tc)
On-State Resistance (Rds On) @ 100A, 10V	1.6	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3.9	V
Gate Charge (Qg) @ 10V	324	nC
Power Dissipation (Max)	294	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
Technology	MOSFET (Metal Oxide)	N-Channel
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IRFS7434PBF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss): 40V (exact match required)
Package Type: D2PAK / TO-263-3 (mechanical and thermal interface requirement)
Mounting Type: Surface Mount (assembly compatibility)
Technology: N-Channel MOSFET (functional requirement)
Operating Temperature Range: -55°C to 175°C (environmental specification)

Secondary Compatibility Parameters:

Continuous Drain Current (Id): Minimum 120A acceptable; original part rated 195A
On-State Resistance (Rds On): Range 1.3–1.8 mOhm @ 10V (electrical performance tolerance)
Gate Threshold Voltage (Vgs(th)): Range 2.0–4.0V (gate drive compatibility)
Gate Charge (Qg): Range 120–390 nC (switching speed and drive circuit compatibility)
Power Dissipation: Minimum 158W acceptable (thermal management consideration)

Regulatory Compliance:

RoHS3 Compliance (mandatory for new designs)
REACH Status: Unaffected or Affected (documented)
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts identified in this reference maintain all primary criteria and fall within acceptable ranges for secondary parameters. Current rating reduction from 195A to 110–120A is acceptable for applications not requiring the full original current capacity.

Parameter Comparison

Parameter	IRFS7434PBF	IPB015N04LGATMA1	IPB015N04NGATMA1	IPB120N04S402ATMA1	BUK761R6-40E,118	BUK961R6-40E,118	FDB9406-F085	PSMN1R1-40BS,118
Vdss (V)	40	40	40	40	40	40	40	40
Id @ 25°C (A)	195	120	120	120	120	120	110	120
Rds On @ 10V (mOhm)	1.6	1.5	1.5	1.8	1.6	1.4	1.8	1.3
Vgs(th) (V)	3.9	2.0	4.0	4.0	4.0	2.1	4.0	4.0
Qg @ 10V (nC)	324	346	250	134	145	120	138	136
Power Dissipation (W)	294	250	250	158	349	357	176	306
Package	D2PAK	PG-TO263-3	PG-TO263-3	PG-TO263-3	D2PAK	D2PAK	TO-263	D2PAK
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
Product Status	Discontinued	Not For New Designs	Active	Active	Active	Active	Obsolete	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Product Status):

IPB015N04NGATMA1 (Infineon Technologies, OptiMOS™ Series)

Product Status: Active
Continuous Drain Current: 120A (38% reduction from original 195A)
On-State Resistance: 1.5 mOhm @ 10V (equivalent to original)
Gate Charge: 250 nC (23% reduction, improved switching speed)
Power Dissipation: 250W (15% reduction)
Packaging: Tape & Reel (TR), PG-TO263-3
Suitable for applications where 120A current capacity is sufficient and improved gate charge characteristics are beneficial

IPB120N04S402ATMA1 (Infineon Technologies, OptiMOS™ Series)

Product Status: Active
Continuous Drain Current: 120A (38% reduction from original 195A)
On-State Resistance: 1.8 mOhm @ 10V (acceptable tolerance)
Gate Charge: 134 nC (59% reduction, fastest switching)
Power Dissipation: 158W (46% reduction, lowest thermal load)
Packaging: Tape & Reel (TR), PG-TO263-3
Optimal for high-frequency switching applications with reduced thermal requirements

PSMN1R1-40BS,118 (Nexperia USA Inc.)

Product Status: Active
Continuous Drain Current: 120A (38% reduction from original 195A)
On-State Resistance: 1.3 mOhm @ 10V (superior performance, 19% improvement)
Gate Charge: 136 nC (58% reduction)
Power Dissipation: 306W (4% increase, acceptable)
Packaging: Tape & Reel (TR), D2PAK
Recommended for applications prioritizing low on-state resistance and improved efficiency

Alternative Substitutes (Automotive Grade, Active Status):

BUK761R6-40E,118 (Nexperia USA Inc., TrenchMOS™ Series)

Product Status: Active
Grade: Automotive, AEC-Q101 Qualified
Continuous Drain Current: 120A
On-State Resistance: 1.6 mOhm @ 10V (exact match to original)
Power Dissipation: 349W (19% increase)
Suitable for automotive applications requiring AEC-Q101 qualification

BUK961R6-40E,118 (Nexperia USA Inc., TrenchMOS™ Series)

Product Status: Active
Grade: Automotive, AEC-Q101 Qualified
Continuous Drain Current: 120A
On-State Resistance: 1.4 mOhm @ 10V (12% improvement)
Gate Charge: 120 nC (63% reduction, fastest switching)
Power Dissipation: 357W (21% increase)
Suitable for automotive applications with high-frequency switching requirements

Not Recommended for New Designs:

IPB015N04LGATMA1 (Infineon Technologies)

Product Status: Not For New Designs
While electrically compatible, this part should not be selected for new design implementations

FDB9406-F085 (onsemi, PowerTrench® Series)

Product Status: Obsolete
Not suitable for new production due to obsolescence status

Frequently Asked Questions (FAQ)

Q1: Can I use a substitute part with lower continuous drain current (120A vs. 195A)?

A: Yes, if your application does not require the full 195A current capacity. The substitute parts rated at 120A or 110A are electrically and mechanically compatible with the IRFS7434PBF. Verify that your circuit's maximum drain current does not exceed the substitute part's rating. Thermal analysis should be performed to confirm adequate heat dissipation at your application's operating current.

Q2: What is the difference between D2PAK and PG-TO263-3 packaging?

A: D2PAK and PG-TO263-3 are equivalent package designations for the same physical form factor (TO-263-3). Both refer to a surface mount package with 2 leads plus a tab for thermal connection. These packages are mechanically and thermally interchangeable in PCB layouts designed for TO-263-3 footprints.

Q3: Why do some substitute parts have lower gate charge (Qg)?

A: Lower gate charge indicates faster switching speed and reduced gate drive power requirements. Parts like IPB120N04S402ATMA1 (134 nC) and BUK961R6-40E,118 (120 nC) switch faster than the original IRFS7434PBF (324 nC). This can improve efficiency in high-frequency applications but requires verification that your gate drive circuit can support the faster switching transitions.

Q4: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed in this reference are RoHS3 compliant. The original IRFS7434PBF is also RoHS3 compliant. Verify REACH status for your specific application requirements; most substitutes are REACH Unaffected, with the exception of NP110N04PUK-E1-AY (REACH Affected).

Q5: Which substitute should I choose for automotive applications?

A: For automotive applications requiring AEC-Q101 qualification, select either BUK761R6-40E,118 or BUK961R6-40E,118 (both Nexperia TrenchMOS™ series). These parts carry automotive grade designation and AEC-Q101 qualification. The Infineon OptiMOS™ parts (IPB015N04NGATMA1, IPB120N04S402ATMA1) are not explicitly listed with automotive qualification in the provided data.

Q6: What is the impact of on-state resistance (Rds On) variation on my circuit?

A: On-state resistance directly affects power dissipation and heat generation. Lower Rds On values (e.g., PSMN1R1-40BS,118 at 1.3 mOhm) reduce conduction losses and improve efficiency. Higher values (e.g., IPB120N04S402ATMA1 at 1.8 mOhm) increase power dissipation. Select based on your thermal budget and efficiency requirements. Verify that the substitute's Rds On is acceptable for your application's current levels.

Q7: Can I use NP110N04PUK-E1-AY or NP110N04PUG-E1-AY (Renesas) as substitutes?

A: Yes, both Renesas parts are electrically compatible with 40V, 110A ratings, and D2PAK/TO-263-3 packaging. However, NP110N04PUK-E1-AY has REACH Affected status, which may restrict use in certain markets. NP110N04PUG-E1-AY is not listed with REACH status in the provided data. Verify regulatory compliance for your target market before selection.

Q8: Why is the IRFS7434PBF discontinued?

A: The original part is discontinued at DiGi Electronics. This is a common occurrence in the semiconductor industry as manufacturers transition to newer product lines with improved performance characteristics. The substitute parts listed represent current-generation alternatives with comparable or superior electrical performance.

Q9: Should I perform thermal analysis when switching to a substitute part?

A: Yes. While all substitute parts maintain the same 40V voltage rating and D2PAK package, variations in power dissipation (158W to 357W) and on-state resistance (1.3 to 1.8 mOhm) affect thermal performance. Perform thermal simulation or testing to confirm that your PCB layout and thermal management strategy remain adequate for the selected substitute.

Q10: Are there any gate drive voltage differences I should consider?

A: Yes. The original IRFS7434PBF specifies drive voltages of 6V and 10V for maximum and minimum Rds On conditions. Substitute parts generally specify 10V drive voltage. Verify that your gate drive circuit can supply the required voltage for your selected substitute. Parts with lower gate threshold voltage (Vgs(th)) like BUK961R6-40E,118 (2.1V) may require different gate drive timing considerations compared to parts with higher thresholds (4.0V).

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