IRLR2905ZTRLPBF N-Channel 55V 42A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR2905ZTRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 42A continuous drain current in a surface mount DPAK package. This device is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement. The part belongs to the HEXFET® series and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	42	A
On-State Resistance (Rds On) @ 36A, 10V	13.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3	V
Gate Charge (Qg) @ 5V	35	nC
Power Dissipation (Max)	110	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252-3 DPAK	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the IRLR2905ZTRLPBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): 55V minimum
Continuous Drain Current (Id): 42A minimum at 25°C
On-State Resistance (Rds On): 13.5mOhm maximum at specified conditions
Package Type: TO-252-3 DPAK (2 Leads + Tab, SC-63)
Mounting Type: Surface Mount
FET Type: N-Channel
Technology: MOSFET (Metal Oxide)

Substitution Logic: Parts are grouped into three categories based on electrical performance relative to the main part:

Direct Equivalents – Identical electrical specifications and package, with Active product status
Higher Voltage Rated Substitutes – Vdss exceeds 55V, maintaining or improving current handling and Rds On characteristics
Performance-Optimized Substitutes – Enhanced current capacity or reduced on-state resistance while maintaining voltage rating and package compatibility

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and surface mount DPAK packaging to ensure mechanical and environmental compatibility.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Dissipation (W)	Product Status	Package
IRLR2905ZTRLPBF	Infineon	55	42	13.5	35	110	Obsolete	TO-252-3 DPAK
IRLR2905ZTRPBF	Infineon	55	42	13.5	35	110	Active	TO-252-3 DPAK
IPD30N10S3L34ATMA1	Infineon	100	30	31	31	57	Active	TO-252-3 DPAK
BUK7212-55B,118	Nexperia	55	75	12	35	167	Obsolete	TO-252-3 DPAK
BUK9217-75B,118	Nexperia	75	64	15	35	167	Obsolete	TO-252-3 DPAK
NP52N055SUG-E1-AY	Renesas	55	52	14	57	56	Active	TO-252-3 DPAK
STD25NF10LT4	STMicroelectronics	100	25	35	52	100	Active	TO-252-3 DPAK
STD26NF10	STMicroelectronics	100	25	38	55	100	Active	TO-252-3 DPAK
STD30NF06LT4	STMicroelectronics	60	35	28	31	70	Active	TO-252-3 DPAK
STD35NF06LT4	STMicroelectronics	60	35	17	33	80	Active	TO-252-3 DPAK
STD45NF75T4	STMicroelectronics	75	40	24	80	125	Active	TO-252-3 DPAK

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

IRLR2905ZTRPBF is the direct equivalent to IRLR2905ZTRLPBF with identical electrical specifications (55V, 42A, 13.5mOhm Rds On). The primary distinction is Active product status, ensuring long-term availability and supply chain continuity. This part is manufactured by Infineon Technologies under the same HEXFET® series and maintains all compliance certifications (ROHS3, REACH Unaffected, EAR99). Inventory availability is significantly higher (45,100 pcs vs. 2,320 pcs), supporting production requirements.

Higher Current Capacity Substitutes (55V Rating):

BUK7212-55B,118 (Nexperia, TrenchMOS™ series) provides 75A continuous drain current at 55V with improved on-state resistance (12mOhm vs. 13.5mOhm) and higher power dissipation capability (167W vs. 110W). This part is classified as Obsolete but maintains AEC-Q101 automotive qualification. NP52N055SUG-E1-AY (Renesas) offers 52A at 55V with comparable on-state resistance (14mOhm) and Active product status, providing enhanced current margin with reduced power dissipation (56W).

Higher Voltage Rated Substitutes:

STD30NF06LT4 and STD35NF06LT4 (STMicroelectronics, STripFET™ series) operate at 60V with 35A current rating. STD35NF06LT4 provides superior on-state resistance (17mOhm) and higher power dissipation (80W). STD25NF10LT4 and STD26NF10 (STMicroelectronics, STripFET™ II series) operate at 100V with 25A current rating, suitable for applications requiring higher voltage margin. STD45NF75T4 (STMicroelectronics) provides 75V, 40A with 24mOhm Rds On and 125W power dissipation.

IPD30N10S3L34ATMA1 (Infineon, OptiMOS™ series) operates at 100V with 30A current rating and Active product status, offering voltage headroom for designs requiring higher blocking voltage.

Selection Criteria:

For direct replacement: IRLR2905ZTRPBF (Active status, identical specifications)
For higher current applications: BUK7212-55B,118 or NP52N055SUG-E1-AY (55V rating with enhanced current capacity)
For higher voltage margin: STD30NF06LT4, STD35NF06LT4, or STD45NF75T4 (60V–75V rating)
For maximum voltage headroom: STD25NF10LT4, STD26NF10, or IPD30N10S3L34ATMA1 (100V rating)

All recommended substitutes maintain TO-252-3 DPAK package compatibility, surface mount capability, ROHS3 compliance, and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q1: Can IRLR2905ZTRPBF directly replace IRLR2905ZTRLPBF?

Yes. IRLR2905ZTRPBF is the direct equivalent with identical electrical specifications: 55V Vdss, 42A continuous drain current, 13.5mOhm Rds On, and 110W power dissipation. The primary difference is Active product status versus Obsolete. Both use TO-252-3 DPAK packaging and are ROHS3 compliant. No circuit modifications are required.

Q2: What is the difference between the substitute parts with 55V, 60V, 75V, and 100V ratings?

Voltage rating (Vdss) determines the maximum drain-to-source voltage the MOSFET can block. The IRLR2905ZTRLPBF is rated for 55V. Substitutes with higher voltage ratings (60V, 75V, 100V) provide additional voltage margin but may have different on-state resistance and current handling characteristics. Selection depends on the application's voltage requirements and thermal constraints.

Q3: Why do some substitutes have lower current ratings than the main part?

Current rating (Id) and on-state resistance (Rds On) are interdependent design parameters. Some substitutes prioritize lower on-state resistance or higher voltage rating over current capacity. For example, STD25NF10LT4 is rated for 25A at 100V but has 35mOhm Rds On. Selection should match the application's current and voltage requirements.

Q4: Are all substitute parts compatible with the same PCB layout?

Yes. All substitute parts listed use TO-252-3 DPAK packaging (2 Leads + Tab, SC-63) with identical pin configuration and footprint. No PCB layout modifications are required for mechanical compatibility. Thermal management considerations may differ based on power dissipation ratings.

Q5: Which substitutes have Active product status?

Active status parts include: IRLR2905ZTRPBF, IPD30N10S3L34ATMA1, NP52N055SUG-E1-AY, STD25NF10LT4, STD26NF10, STD30NF06LT4, STD35NF06LT4, and STD45NF75T4. These parts have confirmed long-term availability and supply chain support.

Q6: What is the significance of gate charge (Qg) differences among substitutes?

Gate charge affects switching speed and gate drive circuit requirements. The main part has 35nC Qg at 5V. Substitutes with higher Qg values (e.g., NP52N055SUG-E1-AY at 57nC, STD45NF75T4 at 80nC) require higher gate drive energy. Lower Qg values enable faster switching with reduced drive power. Gate drive circuit design should accommodate the selected part's Qg specification.

Q7: Can I use a substitute with higher power dissipation rating in a thermally constrained application?

Higher power dissipation rating indicates greater thermal capability but does not reduce actual power dissipation in the circuit. Actual power dissipation depends on on-state resistance (Rds On) and operating current. A substitute with lower Rds On (e.g., STD35NF06LT4 at 17mOhm vs. 13.5mOhm) may generate more heat at the same current. Thermal analysis based on actual operating conditions is required.

Q8: Are all substitutes ROHS3 compliant?

Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the main part's environmental compliance. REACH status is Unaffected for all parts, and ECCN classification is EAR99.

Q9: Which substitutes are qualified for automotive applications?

BUK7212-55B,118 and BUK9217-75B,118 (Nexperia) carry AEC-Q101 automotive qualification. Other substitutes do not list automotive qualification in the provided specifications.

Q10: What is the recommended substitute if the application requires exact current and voltage specifications?

IRLR2905ZTRPBF is the recommended choice, providing identical 55V, 42A specifications with Active product status. This ensures direct compatibility without circuit redesign or thermal re-analysis.

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