IRFR3504ZTRLPBF N-Channel 40V 42A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFR3504ZTRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage and 42A continuous drain current in the HEXFET® series. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The part is housed in a TO-252-3 DPAK (2 Leads + Tab) surface mount package with unlimited moisture sensitivity level (MSL 1). Equivalent alternatives are available from multiple manufacturers including STMicroelectronics, onsemi, and Vishay Siliconix, with varying electrical characteristics and product status classifications.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	42	A (Tc)
On-State Resistance (Rds On) @ 42A, 10V	9	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	45	nC
Power Dissipation (Max)	90	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 DPAK	Surface Mount
Product Status	Obsolete	N/A

Substitute Part Grouping Explanation

Substitution of the IRFR3504ZTRLPBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 40V minimum required
Continuous Drain Current (Id): 42A minimum required
On-State Resistance (Rds On): 9mOhm or lower at rated conditions
Package Type: TO-252-3 DPAK (2 Leads + Tab) surface mount
Gate-Source Threshold Voltage (Vgs(th)): 2V to 4.5V range
Operating Temperature: -55°C to 175°C minimum

Substitution Categories:

Category 1 - Parametric Equivalent (Direct Replacement): IRFR3504ZTRPBF matches all electrical specifications and package requirements. This part is an active product with identical Vdss (40V), Id (42A), Rds On (9mOhm), and gate charge characteristics. Packaging is identical TO-252-3 DPAK. This represents a direct parametric equivalent suitable for one-to-one replacement.

Category 2 - Manufacturer Recommended Substitutes (Higher Performance): Parts including STD64N4F6AG, STD95N4F3, and STD95N4LF3 exceed the minimum current rating (54A to 80A) while maintaining 40V Vdss and DPAK packaging. These devices offer lower or comparable Rds On values and are active products with automotive qualification (AEC-Q101) where applicable.

Category 3 - Voltage/Current Trade-off Substitutes: STD100N3LF3 (30V, 80A), IPD50N03S2L06ATMA1 (30V, 50A), and SQD50N05-11L_GE3 (50V, 50A) provide alternative voltage and current combinations. These parts maintain DPAK packaging and comparable Rds On performance but operate at different voltage ratings.

Category 4 - Legacy/Obsolete Alternatives: FDD8647L (onsemi) and STD100N3LF3 (STMicroelectronics) are classified as obsolete but remain available in inventory. These parts share 40V Vdss or comparable electrical characteristics with DPAK packaging.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Power Diss. (W)	Status	Package
IRFR3504ZTRLPBF	Infineon	40	42	9	4	45	90	Obsolete	TO-252-3 DPAK
IRFR3504ZTRPBF	Infineon	40	42	9	4	45	90	Active	TO-252-3 DPAK
STD64N4F6AG	STMicroelectronics	40	54	8.2	4.5	44	60	Active	TO-252-3 DPAK
STD95N4F3	STMicroelectronics	40	80	6.5	4	54	110	Active	TO-252-3 DPAK
STD95N4LF3	STMicroelectronics	40	80	6	2.5	70	110	Active	TO-252-3 DPAK
FDD8647L	onsemi	40	42	9	3	28	43	Obsolete	TO-252-3 DPAK
STD100N3LF3	STMicroelectronics	30	80	5.5	2.5	27	110	Obsolete	TO-252-3 DPAK
IPD50N03S2L06ATMA1	Infineon	30	50	6.4	2	68	136	Active	TO-252-3 DPAK
SQD50N05-11L_GE3	Vishay Siliconix	50	50	11	2.5	52	75	Active	TO-252-3 DPAK
STD65N55F3	STMicroelectronics	55	80	8.5	4	45	110	Active	TO-252-3 DPAK

Engineering Selection Recommendations

First Priority - Parametric Equivalent: IRFR3504ZTRPBF is the recommended direct replacement. This part is manufactured by Infineon Technologies with identical electrical specifications (40V, 42A, 9mOhm Rds On) and is classified as an active product. It maintains full compatibility with existing PCB layouts and circuit designs. RoHS3 compliance and REACH unaffected status match the original part.

Second Priority - Higher Performance Active Alternatives: STD64N4F6AG (STMicroelectronics) and STD95N4F3 (STMicroelectronics) are active products with 40V Vdss rating and enhanced current handling (54A and 80A respectively). Both maintain TO-252-3 DPAK packaging and lower Rds On values (8.2mOhm and 6.5mOhm). STD64N4F6AG carries AEC-Q101 automotive qualification. These parts are suitable for applications requiring higher current margins or improved thermal performance.

Third Priority - Voltage Trade-off Alternatives: For applications where 30V operation is acceptable, IPD50N03S2L06ATMA1 (Infineon, active, AEC-Q101 qualified) provides 50A continuous current with 6.4mOhm Rds On and superior power dissipation (136W). SQD50N05-11L_GE3 (Vishay Siliconix, active) offers 50V Vdss with 50A current rating for applications requiring higher voltage margin.

Avoid - Obsolete Parts: IRFR3504ZTRLPBF (original part), FDD8647L, and STD100N3LF3 are classified as obsolete. While inventory may be available, these parts should not be selected for new designs or long-term production commitments.

Frequently Asked Questions (FAQ)

Q1: Can IRFR3504ZTRPBF directly replace IRFR3504ZTRLPBF? Yes. IRFR3504ZTRPBF is the parametric equivalent with identical electrical specifications (40V, 42A, 9mOhm Rds On, 45nC gate charge) and package type (TO-252-3 DPAK). The primary difference is product status: IRFR3504ZTRPBF is active while the original is obsolete. No circuit modifications are required.

Q2: What is the difference between the DPAK and other package types listed? All substitute parts listed use TO-252-3 DPAK (2 Leads + Tab) surface mount packaging, which is mechanically and electrically compatible with the original IRFR3504ZTRLPBF. This ensures PCB footprint compatibility without layout redesign.

Q3: Why do some substitutes have lower Rds On values? Lower Rds On values indicate improved on-state performance and reduced power dissipation. Parts such as STD95N4F3 (6.5mOhm) and STD95N4LF3 (6mOhm) represent newer technology generations with enhanced efficiency. These are suitable for applications where thermal management or power efficiency is critical.

Q4: Can I use STD100N3LF3 as a substitute despite its 30V rating? STD100N3LF3 has a lower Vdss rating (30V vs. 40V). This part is suitable only for applications where the maximum operating voltage does not exceed 30V. Using this part in a 40V circuit would result in device failure. Additionally, STD100N3LF3 is classified as obsolete.

Q5: What does AEC-Q101 qualification mean? AEC-Q101 is an automotive qualification standard. Parts carrying this certification (STD64N4F6AG, IPD50N03S2L06ATMA1) have undergone rigorous testing for automotive applications and are suitable for use in automotive and industrial environments requiring enhanced reliability.

Q6: Is RoHS3 compliance important for my application? RoHS3 compliance indicates the part meets European Union restrictions on hazardous substances. All active substitute parts listed are RoHS3 compliant. If your application requires RoHS compliance, verify this status before selection.

Q7: How do I choose between STD95N4F3 and STD95N4LF3? Both parts have identical 40V, 80A ratings and DPAK packaging. STD95N4F3 has a 4V gate threshold and 54nC gate charge. STD95N4LF3 has a 2.5V gate threshold and 70nC gate charge. STD95N4LF3 is easier to drive at lower gate voltages but requires higher gate charge. Select based on your gate driver capabilities.

Q8: Why is inventory quantity listed for each part? Inventory levels indicate current availability from distributors. Parts with higher inventory (such as STD64N4F6AG with 104,427 pieces) offer better procurement reliability and shorter lead times. Obsolete parts with limited inventory may face future availability constraints.

Q9: Can I use SQD50N05-11L_GE3 in place of IRFR3504ZTRLPBF? SQD50N05-11L_GE3 has a higher Vdss rating (50V vs. 40V) and comparable current (50A vs. 42A). The higher voltage rating provides additional safety margin but results in slightly higher Rds On (11mOhm vs. 9mOhm). This part is suitable if your circuit can tolerate the higher on-state resistance and you require the higher voltage rating.

Q10: What is the significance of gate charge (Qg) differences? Gate charge affects switching speed and gate driver power requirements. Higher gate charge (such as STD95N4LF3 at 70nC) requires more energy to switch the device but may offer other performance benefits. Lower gate charge (FDD8647L at 28nC) reduces switching losses. Select based on your gate driver circuit design.

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