IRF7425PBF Equivalent & Substitute Parts

Part Overview

The IRF7425PBF is a P-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage and 15A continuous drain current in a surface mount 8-SO package. This device is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain compatibility with existing PCB layouts, thermal management strategies, and electrical performance parameters within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	15	A
Rds On (Max) @ Id, Vgs	8.2 mOhm @ 15A, 4.5V	—
Gate Charge (Qg) @ Vgs	130 nC @ 4.5V	—
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IRF7425PBF is determined by the following critical parameters:

Primary Substitution Criteria:

FET channel type (P-Channel required)
Drain-to-source voltage rating (minimum 20V)
Continuous drain current capability (minimum 15A at 25°C)
Package compatibility (8-SO or 8-SOIC surface mount)
Operating temperature range (-55°C to 150°C minimum)
RoHS3 compliance

Secondary Compatibility Factors:

On-resistance (Rds On) at rated current and gate voltage
Gate charge characteristics
Power dissipation capability
Input capacitance

Substitute parts are grouped into two categories:

Category A - Direct P-Channel Substitutes (Vdss ≥ 20V, Id ≥ 13.5A):

FDS4465 (onsemi): Matches Vdss and power dissipation; slightly lower Id rating
DMG4413LSS-13 (Diodes Incorporated): Higher Vdss rating (30V); lower Id rating (10.5A)
SI4463BDY-T1-GE3 (Vishay Siliconix): Matches Vdss; lower Id rating (9.8A)

Category B - Non-Substitutable:

ECH8420-TL-H (onsemi): N-Channel device; incompatible channel type for P-Channel applications

Parameter Comparison

Parameter	IRF7425PBF	FDS4465	DMG4413LSS-13	SI4463BDY-T1-GE3	ECH8420-TL-H
Manufacturer	Infineon	onsemi	Diodes Inc.	Vishay	onsemi
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	N-Channel
Vdss (V)	20	20	30	20	20
Id @ 25°C (A)	15	13.5	10.5	9.8	14
Rds On (Max) (mOhm)	8.2 @ 15A, 4.5V	8.5 @ 13.5A, 4.5V	7.5 @ 13A, 10V	11 @ 13.7A, 10V	6.8 @ 7A, 4.5V
Qg (Max) (nC)	130 @ 4.5V	120 @ 4.5V	46 @ 5V	56 @ 4.5V	29 @ 4.5V
Power Dissipation (Max) (W)	2.5	2.5	1.7	1.5	1.6
Operating Temp (°C)	-55 to 150	-55 to 175	-55 to 150	-55 to 150	to 150
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SMD, Flat Lead
Product Status	Discontinued	Active	Active	Last Time Buy	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

FDS4465 (onsemi) - Recommended Primary Substitute

The FDS4465 is the most direct substitute for the IRF7425PBF. Both devices share identical Vdss (20V) and power dissipation ratings (2.5W). The FDS4465 delivers 13.5A continuous drain current, representing a 10% reduction from the IRF7425PBF specification. On-resistance characteristics are comparable (8.5 mOhm vs. 8.2 mOhm), and gate charge is slightly lower (120 nC vs. 130 nC), resulting in marginally improved switching performance. The device is actively manufactured and available in high inventory quantities. Extended operating temperature range (-55°C to 175°C) provides additional thermal margin. Package compatibility is confirmed (8-SOIC). RoHS3 compliance and MSL-1 rating match the original specification.

DMG4413LSS-13 (Diodes Incorporated) - Secondary Substitute

The DMG4413LSS-13 provides higher voltage headroom (30V Vdss) suitable for applications requiring derating margin. Continuous drain current is rated at 10.5A, representing a 30% reduction from the IRF7425PBF. On-resistance at 10V gate drive (7.5 mOhm) is superior to the original device. Gate charge is significantly lower (46 nC), enabling faster switching transitions. Power dissipation is reduced to 1.7W, indicating improved thermal efficiency. The device is actively manufactured with substantial inventory availability. Package and compliance specifications align with the original part.

SI4463BDY-T1-GE3 (Vishay Siliconix) - Tertiary Substitute

The SI4463BDY-T1-GE3 maintains Vdss parity (20V) with the IRF7425PBF. Continuous drain current is limited to 9.8A, representing a 35% reduction. On-resistance at 10V gate drive (11 mOhm) is higher than the original specification. Gate charge is substantially lower (56 nC), supporting faster switching applications. Power dissipation is reduced to 1.5W. The device carries a Last Time Buy status, indicating limited future availability. Selection of this part requires confirmation of long-term supply requirements.

ECH8420-TL-H (onsemi) - Not Substitutable

The ECH8420-TL-H is an N-Channel MOSFET and is not substitutable for P-Channel applications. Channel type incompatibility precludes functional equivalence regardless of electrical parameter alignment.

Frequently Asked Questions (FAQ)

Q: Can the FDS4465 replace the IRF7425PBF in all applications?

A: The FDS4465 is suitable for applications where the 13.5A continuous drain current rating meets or exceeds the design requirement. If the circuit demands the full 15A capability of the IRF7425PBF under continuous operation, the FDS4465 may not be appropriate. Thermal analysis must confirm that the 2.5W power dissipation rating provides adequate margin for the intended duty cycle.

Q: Why is the ECH8420-TL-H listed as a substitute if it is N-Channel?

A: The ECH8420-TL-H was included in the original substitute list provided but is not functionally equivalent due to channel type incompatibility. P-Channel and N-Channel MOSFETs operate with opposite polarity gate drive signals and cannot be interchanged without circuit redesign.

Q: Are all substitute parts available in the same package?

A: The FDS4465, DMG4413LSS-13, and SI4463BDY-T1-GE3 are all available in 8-SOIC packages with identical footprints (0.154", 3.90mm width), enabling direct PCB layout compatibility. The ECH8420-TL-H uses an 8-SMD flat lead package, which is not footprint-compatible.

Q: What is the significance of the "Last Time Buy" status for the SI4463BDY-T1-GE3?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this device. Existing inventory may be available for a limited period, but long-term supply cannot be guaranteed. New designs should prioritize actively manufactured alternatives such as the FDS4465 or DMG4413LSS-13.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. Lower gate charge (FDS4465: 120 nC, DMG4413LSS-13: 46 nC) reduces switching losses and enables faster switching transitions compared to the IRF7425PBF (130 nC). This can improve efficiency in high-frequency switching applications but requires verification that the gate driver circuit can supply the necessary charge within the required time window.

Q: Can on-resistance differences impact thermal performance?

A: On-resistance (Rds On) directly affects power dissipation through the relationship P = I²R. The FDS4465 (8.5 mOhm) and IRF7425PBF (8.2 mOhm) produce nearly identical dissipation at rated current. The DMG4413LSS-13 (7.5 mOhm) and SI4463BDY-T1-GE3 (11 mOhm) show lower and higher dissipation respectively. Thermal analysis must account for actual operating current, which may differ from the continuous rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The FDS4465, DMG4413LSS-13, SI4463BDY-T1-GE3, and ECH8420-TL-H are all RoHS3 compliant with MSL-1 (unlimited) moisture sensitivity ratings, matching the original IRF7425PBF specification.

Q: What is the impact of higher Vdss rating on the DMG4413LSS-13?

A: The 30V Vdss rating of the DMG4413LSS-13 provides additional voltage margin compared to the 20V IRF7425PBF. This allows operation in circuits with higher transient voltages or provides derating margin for reliability. However, higher voltage ratings typically result in increased on-resistance and gate charge, which is reflected in the DMG4413LSS-13 specifications.

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