IRLR2905Z N-Channel MOSFET 55V 42A Equivalent & Substitute Parts

Part Overview

The IRLR2905Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 42A continuous drain current in the HEXFET® series. This device is classified as obsolete product status. Due to its obsolescence, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	42	A (Tc)
On-State Resistance (Rds On) @ 36A, 10V	13.5	mOhm
Power Dissipation (Max)	110	W (Tc)
Gate Threshold Voltage (Vgs(th)) @ 250µA	3	V (Max)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the IRLR2905Z is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 55V
Continuous Drain Current (Id): Must equal or exceed 42A at 25°C
On-State Resistance (Rds On): Lower or equivalent values preferred for thermal performance
Package Type: TO-252-3 (DPAK) form factor required for mechanical compatibility
Mounting Type: Surface Mount configuration mandatory
Operating Temperature Range: Must support -55°C to 175°C (TJ)

Secondary Considerations:

Gate Threshold Voltage (Vgs(th)): Compatibility with existing gate drive circuits
Power Dissipation Rating: Thermal management capability
RoHS Compliance: Preferred for new designs and regulatory alignment

Substitute parts are grouped into two categories: direct electrical equivalents (matching or exceeding all primary parameters) and functional alternatives (meeting minimum performance requirements with acceptable trade-offs in secondary parameters).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Power Diss. (W)	Vgs(th) (V)	Package	Status	RoHS
IRLR2905Z	Infineon	55	42	13.5	110	3	TO-252-3	Obsolete	Non-compliant
STD60NF55LT4	STMicroelectronics	55	60	15	100	2	TO-252-3	Active	ROHS3
STD60NF55LAT4	STMicroelectronics	55	60	15	110	2	TO-252-3	Active	ROHS3
STD45NF75T4	STMicroelectronics	75	40	24	125	4	TO-252-3	Active	ROHS3
STD35NF06LT4	STMicroelectronics	60	35	17	80	2.5	TO-252-3	Active	ROHS3
STD30NF06LT4	STMicroelectronics	60	35	28	70	2.5	TO-252-3	Active	ROHS3
STD25NF10LT4	STMicroelectronics	100	25	35	100	2.5	TO-252-3	Active	ROHS3
STD26NF10	STMicroelectronics	100	25	38	100	4	TO-252-3	Active	ROHS3
IPD30N10S3L34ATMA1	Infineon	100	30	31	57	2.4	TO-252-3	Active	ROHS3
FDD13AN06A0-F085	onsemi	60	50	13.5	115	4	TO-252-3	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended Primary Substitutes):

STD60NF55LT4 and STD60NF55LAT4 from STMicroelectronics are the primary recommended substitutes. Both devices match the 55V Vdss rating and exceed the 42A continuous drain current requirement with 60A capability. Both are in active product status with ROHS3 compliance. STD60NF55LAT4 includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. The slightly higher Rds On (15 mOhm vs. 13.5 mOhm) results in marginally higher power dissipation but remains within acceptable thermal limits for the 110W (Tc) power rating.

Tier 2 - Functional Alternatives (Secondary Substitutes):

FDD13AN06A0-F085 from onsemi provides an alternative with matching 60V Vdss, superior 50A continuous drain current, and identical 13.5 mOhm Rds On. This device includes AEC-Q101 automotive qualification and PowerTrench® technology. The higher gate threshold voltage (4V vs. 3V) requires verification of gate drive circuit compatibility.

STD45NF75T4 from STMicroelectronics offers higher voltage rating (75V) and comparable current handling (40A), suitable for applications requiring voltage margin. The higher Rds On (24 mOhm) and gate threshold voltage (4V) represent trade-offs requiring circuit evaluation.

Tier 3 - Limited Substitutes (Reduced Current Rating):

STD35NF06LT4 and STD30NF06LT4 provide 60V Vdss with 35A continuous drain current, below the original 42A specification. These are suitable only for applications where the actual operating current does not exceed 35A.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing regulatory requirements for new production. The original IRLR2905Z is RoHS non-compliant, making transition to compliant alternatives necessary for designs subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can STD60NF55LT4 directly replace IRLR2905Z without circuit modification?

A: STD60NF55LT4 is mechanically and electrically compatible for direct substitution in TO-252-3 (DPAK) footprints. The gate threshold voltage difference (2V vs. 3V) is within typical gate drive circuit tolerance ranges. Verify gate drive voltage and timing margins in your specific application before production implementation.

Q: What is the significance of the 55V vs. 75V or 100V voltage ratings in substitute parts?

A: Drain-to-Source voltage (Vdss) rating determines the maximum voltage the device can block. The original IRLR2905Z is rated for 55V. Substitutes with higher ratings (75V, 100V) provide additional voltage margin and are backward-compatible for 55V applications. Substitutes with lower ratings are not acceptable. Higher voltage ratings typically result in increased on-state resistance and reduced current capacity.

Q: Why do some substitutes have lower continuous drain current than the original 42A specification?

A: STD25NF10LT4 and STD26NF10 are rated for 25A continuous drain current, below the original specification. These parts are listed as functional alternatives only for applications where actual operating current does not exceed 25A. For applications requiring the full 42A capability, Tier 1 or Tier 2 substitutes must be selected.

Q: What does RoHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the device meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original IRLR2905Z is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, required for designs subject to EU RoHS regulations and many OEM procurement standards.

Q: Are AEC-Q101 qualified parts necessary for my application?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and is required for automotive applications. STD60NF55LAT4 and FDD13AN06A0-F085 include this qualification. For non-automotive applications, AEC-Q101 qualification is not mandatory but provides additional reliability assurance.

Q: How does on-state resistance (Rds On) affect circuit performance?

A: Rds On determines power dissipation during conduction: P = I²Rds On. Lower Rds On reduces heat generation and improves efficiency. The original IRLR2905Z specifies 13.5 mOhm at 36A, 10V. STD60NF55LT4 specifies 15 mOhm at 30A, 10V. At full 42A operation, verify thermal management capability with the substitute device's higher Rds On value.

Q: Can I use IPD30N10S3L34ATMA1 as a substitute despite its 100V rating?

A: IPD30N10S3L34ATMA1 is electrically compatible for 55V applications due to its higher voltage rating. However, the 30A continuous drain current is below the original 42A specification. This substitute is suitable only for applications where actual operating current does not exceed 30A. The higher voltage rating and lower current rating indicate this device is optimized for different application requirements.

Q: What package considerations apply to these substitutes?

A: All listed substitutes use TO-252-3 (DPAK) package, identical to the original IRLR2905Z. This ensures mechanical compatibility with existing PCB layouts and thermal management designs. No package-related modifications are required for direct substitution.

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