IRF3205ZSTRL N-Channel 55V 75A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF3205ZSTRL is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 55V drain-to-source voltage and 75A continuous drain current in a surface mount TO-263 (D2PAK) package. This device is discontinued at DiGi Electronics and classified as non-RoHS compliant. Due to its discontinued status and non-compliance with current environmental standards, equivalent and substitute parts are necessary for ongoing design support, production continuity, and regulatory compliance in new applications.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	55	V
Current - Continuous Drain (Id) @ 25°C	75	A
Rds On (Max) @ Id, Vgs	6.5 mOhm @ 66A, 10V	—
Gate Charge (Qg) (Max) @ Vgs	110	nC @ 10V
Power Dissipation (Max)	170	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Surface Mount	—
Package	TO-263-3, D2PAK	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the IRF3205ZSTRL is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss) must equal or exceed 55V
Continuous Drain Current (Id) must equal or exceed 75A at 25°C
On-state resistance (Rds On) must not significantly degrade circuit performance
Gate charge characteristics must be compatible with existing gate drive circuitry
Operating temperature range must encompass -55°C to 175°C

Mechanical Compatibility Requirements:

Package must be TO-263 (D2PAK) or equivalent surface mount configuration
Pin configuration must match TO-263-3 standard (2 Leads + Tab)
Mounting footprint must be identical or compatible with existing PCB layouts

Regulatory and Compliance Requirements:

RoHS3 compliance is preferred for new designs and production continuity
Moisture Sensitivity Level (MSL) of 1 (Unlimited) is acceptable
REACH compliance status must be unaffected or compliant

Substitute parts are grouped into two categories: Direct Replacements (matching 55V/75A specifications) and Enhanced Alternatives (higher voltage or current ratings that operate within the original circuit parameters).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Qg Max (nC)	Power Dissipation (W)	Package	RoHS Status	Product Status
IRF3205ZSTRL	Vishay Siliconix	55	75	6.5	110	170	TO-263 (D2PAK)	Non-compliant	Discontinued
BUK9608-55B,118	Nexperia USA Inc.	55	75	7.0	45	203	D2PAK	ROHS3 Compliant	Active
BUK9606-55A,118	Nexperia USA Inc.	55	75	5.8	—	300	D2PAK	ROHS3 Compliant	Obsolete
BUK6607-55C,118	NXP USA Inc.	55	100	6.5	82	158	D2PAK	—	Active
SQM110N05-06L_GE3	Vishay Siliconix	55	110	6.0	110	157	TO-263 (D2PAK)	ROHS3 Compliant	Active
STB85NF55T4	STMicroelectronics	55	80	8.0	150	300	D2PAK	ROHS3 Compliant	Active
STB140NF55T4	STMicroelectronics	55	80	8.0	142	300	D2PAK	ROHS3 Compliant	Active
STB150NF55T4	STMicroelectronics	55	120	6.0	190	300	D2PAK	ROHS3 Compliant	Active
IPB054N06N3GATMA1	Infineon Technologies	60	80	5.4	82	115	PG-TO263-3	ROHS3 Compliant	Last Time Buy
PSMN7R6-60BS,118	Nexperia USA Inc.	60	92	7.8	38.7	149	D2PAK	ROHS3 Compliant	Active
STB140NF75T4	STMicroelectronics	75	120	7.5	218	310	D2PAK	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Recommendation: BUK9608-55B,118

The BUK9608-55B,118 from Nexperia USA Inc. is the closest functional equivalent to the IRF3205ZSTRL. It matches the 55V/75A specifications exactly, operates across the same temperature range (-55°C to 175°C), and is housed in the identical D2PAK package. The device is RoHS3 compliant and carries Active product status, ensuring long-term availability and supply chain stability. Gate charge is significantly lower (45 nC vs. 110 nC), which reduces gate drive power requirements. Power dissipation is higher (203W vs. 170W), providing additional thermal margin in most applications.

Secondary Recommendation: STB150NF55T4

The STB150NF55T4 from STMicroelectronics provides enhanced performance with 120A continuous drain current at the same 55V rating. This device is RoHS3 compliant and Active. The higher current rating provides design margin for transient conditions. On-state resistance is lower (6.0 mOhm vs. 6.5 mOhm), reducing conduction losses. Power dissipation capability is significantly higher (300W vs. 170W). Gate charge is higher (190 nC vs. 110 nC), requiring proportionally higher gate drive current.

Alternative for Higher Voltage Applications: STB140NF75T4

The STB140NF75T4 from STMicroelectronics is suitable for applications requiring higher voltage headroom. It provides 75V drain-to-source voltage and 120A continuous current in the same D2PAK package. This device is RoHS3 compliant and Active. Use this part only if the original circuit design permits operation at 75V; it is not a direct replacement for 55V-rated designs.

Compliance Consideration:

All recommended substitutes are RoHS3 compliant, addressing the non-compliance status of the original IRF3205ZSTRL. This is critical for new production runs and designs subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can the BUK9608-55B,118 be used as a direct drop-in replacement for the IRF3205ZSTRL?

A: Yes. Both devices share identical electrical ratings (55V, 75A), the same D2PAK package footprint, and compatible pin configurations. Gate charge is lower in the BUK9608-55B,118, which may reduce gate drive power consumption. Existing PCB layouts and gate drive circuits require no modification.

Q: What is the significance of the lower gate charge in the BUK9608-55B,118?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The BUK9608-55B,118 has a gate charge of 45 nC compared to 110 nC in the IRF3205ZSTRL. This reduces gate drive circuit power dissipation and allows faster switching transitions, which can improve overall system efficiency.

Q: Why is the STB150NF55T4 recommended as a secondary option if it has higher gate charge?

A: The STB150NF55T4 provides 120A continuous current versus 75A in the original part, offering design margin for transient overcurrent conditions. Higher gate charge is a trade-off for improved current handling and lower on-state resistance. This part is suitable for applications where additional current capacity is beneficial and gate drive circuitry can accommodate the higher charge requirement.

Q: Can I use the IPB054N06N3GATMA1 or PSMN7R6-60BS,118 as replacements?

A: These parts have higher drain-to-source voltage ratings (60V) than the original 55V specification. They are electrically compatible with 55V circuits because they can withstand higher voltages. However, they are not direct replacements. Use these parts only if your circuit design permits operation at the higher voltage rating or if you require the specific performance characteristics these devices offer.

Q: What is the difference between the STB85NF55T4 and STB140NF55T4?

A: Both devices are rated for 55V and 80A continuous current in the D2PAK package. The STB140NF55T4 has slightly lower gate charge (142 nC vs. 150 nC) and is part of the STripFET™ II series. The STB85NF55T4 is also part of the STripFET™ II series. Both are functionally equivalent for 55V/80A applications and are suitable as alternatives to the IRF3205ZSTRL.

Q: Why is the BUK9606-55A,118 listed but not recommended as a primary choice?

A: The BUK9606-55A,118 is classified as Obsolete, which creates long-term supply chain risk. Although it offers excellent electrical characteristics (5.8 mOhm on-state resistance and 300W power dissipation), the discontinued status makes it unsuitable for new production designs. The BUK9608-55B,118 is the Active equivalent from the same manufacturer.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts are RoHS3 compliant except for the STB140NF75T4 and BUK6607-55C,118, which do not list explicit RoHS status in the provided data. The original IRF3205ZSTRL is non-compliant. RoHS3 compliance is mandatory for most new designs and production runs in regulated markets.

Q: Can I use a higher-rated part like the STB150NF55T4 (120A) in place of the 75A IRF3205ZSTRL without circuit modifications?

A: Yes. Higher current-rated devices are backward compatible with lower current applications. The STB150NF55T4 will operate safely in any circuit designed for the 75A IRF3205ZSTRL. The higher current rating provides additional design margin and does not require circuit changes. Gate drive circuitry must accommodate the higher gate charge (190 nC vs. 110 nC) if switching speed is critical.

Q: What is the moisture sensitivity level (MSL) and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates the device's susceptibility to moisture damage during storage and handling. All listed parts have MSL 1 (Unlimited), meaning they can be stored indefinitely without special moisture control measures. This is the most favorable rating and ensures no additional handling precautions are required compared to the original IRF3205ZSTRL.

Q: Is the package designation "D2PAK" identical across all manufacturers?

A: Yes. D2PAK is a standardized surface mount package designation equivalent to TO-263-3 with 2 leads plus a tab. All substitute parts listed use this identical package, ensuring mechanical and electrical compatibility with existing PCB layouts. Some manufacturers use alternative designations (e.g., PG-TO263-3 for Infineon), but these refer to the same physical package.

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