IRF3205STRR N-Channel 55V 110A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF3205STRR is an N-Channel MOSFET manufactured by Infineon Technologies in the HEXFET® series, rated for 55V drain-to-source voltage and 110A continuous drain current at 25°C. The device is packaged in D2PAK (TO-263-3) surface mount configuration with 200W maximum power dissipation. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The IRF3205STRR serves in high-current switching applications requiring low on-resistance and robust thermal performance within the 55V voltage class.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	110	A
On-Resistance (Rds On) @ 62A, 10V	8	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	146	nC
Power Dissipation (Max)	200	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	Surface Mount
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution for the IRF3205STRR is determined by the following critical parameters: drain-to-source voltage rating (Vdss), continuous drain current capability (Id), on-resistance (Rds On), package type (D2PAK), and mounting configuration (surface mount). The substitute parts are grouped into two categories based on electrical performance alignment:

Category 1: Direct Parametric Equivalents (55V, 110A Class) Parts maintaining the same voltage rating (55V) and current rating (110A) with identical or superior on-resistance characteristics and D2PAK packaging. These parts provide direct functional replacement with no circuit redesign required.

Category 2: Functional Substitutes (55V, 75A Class) Parts rated for 55V with reduced continuous current (75A) but improved on-resistance and thermal performance. These substitutes are suitable for applications where the full 110A capability is not required, offering enhanced efficiency and thermal characteristics.

Category 3: Voltage-Elevated Substitutes (60V Class) Parts rated for 60V with varying current ratings (50A to 92A). These substitutes provide higher voltage margin while maintaining D2PAK packaging and are applicable in circuits with 55V nominal operation where additional voltage headroom is beneficial.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Pd Max (W)	Package	Status	RoHS
IRF3205STRR	Infineon	55	110	8 @ 62A, 10V	146 @ 10V	200	D2PAK	Obsolete	Non-compliant
IRF3205STRLPBF	Infineon	55	110	8 @ 62A, 10V	146 @ 10V	200	D2PAK	Active	ROHS3 Compliant
BUK764R0-55B,118	Nexperia	55	75	4 @ 25A, 10V	86 @ 10V	300	D2PAK	Active	ROHS3 Compliant
BUK9608-55B,118	Nexperia	55	75	7 @ 25A, 10V	45 @ 5V	203	D2PAK	Active	ROHS3 Compliant
BUK7610-55AL,118	Nexperia	55	75	10 @ 25A, 10V	124 @ 10V	300	D2PAK	Obsolete	ROHS3 Compliant
HUF75345S3ST	onsemi	55	75	7 @ 75A, 10V	275 @ 20V	325	D2PAK	Active	ROHS3 Compliant
PHB191NQ06LT,118	Nexperia	55	75	3.7 @ 25A, 10V	95.6 @ 5V	300	D2PAK	Active	ROHS3 Compliant
IPB081N06L3GATMA1	Infineon	60	50	8.1 @ 50A, 10V	29 @ 4.5V	79	D2PAK	Active	ROHS3 Compliant
IPB090N06N3GATMA1	Infineon	60	50	9 @ 50A, 10V	36 @ 10V	71	D2PAK	Active	ROHS3 Compliant
PSMN015-60BS,118	Nexperia	60	50	14.8 @ 15A, 10V	20.9 @ 10V	86	D2PAK	Active	ROHS3 Compliant
PSMN7R6-60BS,118	Nexperia	60	92	7.8 @ 25A, 10V	38.7 @ 10V	149	D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification):

The IRF3205STRLPBF is the primary equivalent for the obsolete IRF3205STRR. Both parts share identical electrical specifications (55V, 110A, 8mOhm Rds On, 200W power dissipation) and D2PAK packaging. The IRF3205STRLPBF is currently in active production status and is ROHS3 compliant, addressing regulatory requirements while maintaining full functional compatibility. This part requires no circuit redesign and provides direct pin-for-pin substitution.

For Current-Reduced Applications (75A Maximum):

When application requirements permit operation at 75A continuous current or below, the following active-status parts offer improved performance characteristics:

BUK764R0-55B,118 (Nexperia TrenchMOS™) provides the lowest on-resistance (4mOhm @ 25A, 10V) with 300W power dissipation and AEC-Q101 automotive qualification. This part is suitable for automotive and industrial applications requiring enhanced efficiency.

BUK9608-55B,118 (Nexperia TrenchMOS™) offers balanced performance with 7mOhm on-resistance, 203W power dissipation, and AEC-Q101 qualification. Gate charge is reduced to 45nC @ 5V, enabling faster switching characteristics.

PHB191NQ06LT,118 (Nexperia TrenchMOS™) delivers the lowest on-resistance (3.7mOhm @ 25A, 10V) with 300W power dissipation, optimizing thermal performance in high-frequency switching applications.

HUF75345S3ST (onsemi UltraFET™) provides 325W power dissipation with 7mOhm on-resistance, offering superior thermal headroom for demanding applications.

For Voltage-Elevated Designs (60V Rating):

PSMN7R6-60BS,118 (Nexperia) supports 92A continuous current at 60V with 7.8mOhm on-resistance and 149W power dissipation. This part is applicable in circuits where 55V nominal operation requires additional voltage margin and current capability approaching the original 110A specification.

IPB081N06L3GATMA1 and IPB090N06N3GATMA1 (Infineon OptiMOS™) are rated for 60V at 50A with reduced power dissipation (79W and 71W respectively), suitable for lower-current applications requiring higher voltage rating.

All recommended active-status substitutes are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q1: Can I use a 75A-rated part as a direct replacement for the 110A IRF3205STRR?

A: Direct replacement depends on application current requirements. If your circuit operates at continuous currents below 75A, parts such as BUK764R0-55B,118 or PHB191NQ06LT,118 are suitable substitutes. However, if your application requires the full 110A capability, only the IRF3205STRLPBF provides equivalent current rating. Verify actual circuit current draw before selecting a reduced-current substitute.

Q2: What is the difference between the obsolete IRF3205STRR and the active IRF3205STRLPBF?

A: Both parts are electrically identical with 55V, 110A, 8mOhm on-resistance, and 200W power dissipation. The primary difference is product status and RoHS compliance. The IRF3205STRLPBF is in active production and ROHS3 compliant, while the IRF3205STRR is obsolete and non-compliant. The IRF3205STRLPBF is the recommended replacement for new designs and ongoing procurement.

Q3: Why would I choose a 60V-rated part over a 55V-rated substitute?

A: 60V-rated parts provide additional voltage margin in circuits with 55V nominal operation, protecting against transient overvoltages and improving reliability. Parts such as PSMN7R6-60BS,118 offer 92A current capability at 60V, approaching the original 110A specification while providing higher voltage headroom. This selection is appropriate for applications with potential voltage spikes or where design margin is critical.

Q4: Are all substitute parts compatible with the D2PAK package footprint?

A: Yes. All substitute parts listed are packaged in D2PAK (TO-263-3) surface mount configuration with identical pin assignments (2 leads + tab). PCB footprints are directly compatible with no layout modifications required. Verify thermal pad dimensions and solder mask openings with specific part datasheets for optimal thermal performance.

Q5: What is the significance of gate charge (Qg) differences among substitutes?

A: Gate charge affects switching speed and driver circuit requirements. The IRF3205STRR has 146nC gate charge @ 10V. Substitutes with lower gate charge (such as BUK9608-55B,118 at 45nC @ 5V) enable faster switching and reduced driver power dissipation. Higher gate charge parts (such as HUF75345S3ST at 275nC @ 20V) require more robust gate drive circuits but may offer improved noise immunity. Select based on your gate driver capability and switching frequency requirements.

Q6: Which substitutes are suitable for automotive applications?

A: BUK764R0-55B,118, BUK7610-55AL,118, BUK9608-55B,118, and PHB191NQ06LT,118 carry AEC-Q101 automotive qualification. These parts meet automotive reliability and qualification standards. For non-automotive applications, all active-status parts are suitable.

Q7: How do on-resistance differences impact thermal performance?

A: On-resistance (Rds On) directly determines conduction losses: P = I²R. Lower on-resistance reduces heat generation. For example, PHB191NQ06LT,118 at 3.7mOhm generates less heat than BUK7610-55AL,118 at 10mOhm at equivalent current levels. However, maximum power dissipation rating (Pd Max) also affects thermal capability. HUF75345S3ST with 325W Pd Max provides superior thermal headroom despite 7mOhm on-resistance compared to parts with lower Pd Max ratings.

Q8: What does RoHS3 compliance mean for my procurement?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active-status substitutes are ROHS3 compliant. The original IRF3205STRR is non-compliant. For new designs and regulated markets, ROHS3-compliant parts are mandatory.

Q9: Can I parallel multiple lower-current parts to achieve 110A capability?

A: Paralleling MOSFETs is not recommended without extensive circuit design modifications. Differences in on-resistance, gate threshold voltage, and thermal characteristics among individual parts create unequal current distribution, leading to thermal runaway in lower-resistance devices. Use the IRF3205STRLPBF for 110A applications requiring direct replacement.

Q10: What is the moisture sensitivity level (MSL) and why is it important?

A: MSL 1 (Unlimited) indicates the part has no moisture sensitivity restrictions and can be stored indefinitely without desiccant packaging. All listed substitutes carry MSL 1 rating, ensuring compatibility with standard manufacturing and storage practices without special handling requirements.

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