IRF3305 N-Channel MOSFET 55V 75A TO-220AB Equivalent & Substitute Parts

Part Overview

The IRF3305 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 75A continuous drain current in a Through Hole TO-220AB package. This device is classified as Obsolete, which necessitates identification of functionally equivalent substitute components for ongoing design support and procurement.

The IRF3305 operates across a temperature range of -55°C to 175°C (TJ) with a maximum power dissipation of 330W (Tc). As an obsolete product, alternative parts with matching or superior electrical characteristics and active product status are required for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	75	A (Tc)
On-State Resistance (Rds On) @ 75A, 10V	8	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	150	nC
Maximum Power Dissipation (Tc)	330	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220AB
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the IRF3305 is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 55V or higher
Continuous Drain Current (Id): 75A or higher at Tc
Gate-Source Threshold Voltage (Vgs(th)): 4V nominal
Maximum Gate-Source Voltage (Vgs): ±20V
Operating Temperature Range: -55°C to 175°C (TJ)
Package: TO-220 series (TO-220AB or TO-220-3)
Mounting Type: Through Hole

Secondary Compatibility Factors:

On-State Resistance (Rds On): Lower or equal values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Equal or higher ratings ensure thermal compatibility
RoHS Compliance: Active substitutes preferably ROHS3 compliant
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (55V, 75A): Parts matching the exact voltage and current ratings with compatible package and threshold characteristics.

Category B - Functional Alternatives (55V-60V, 60A-100A): Parts with slightly different current or voltage ratings but maintaining compatibility within the application envelope.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On @ 10V (mOhm)	Vgs(th) (V)	Qg @ 10V (nC)	Pd Max (W)	Package	Status
IRF3305	Infineon	55	75	8	4	150	330	TO-220AB	Obsolete
IRF1405ZPBF	Infineon	55	75	4.9	4	180	230	TO-220AB	Active
HUF75344P3	onsemi	55	75	8	4	210	285	TO-220-3	Active
HUF75345P3	onsemi	55	75	7	4	275	325	TO-220-3	Active
HUF75339P3	onsemi	55	75	12	4	130	200	TO-220-3	Active
HUF75332P3	onsemi	55	60	19	4	85	145	TO-220-3	Active
PHP191NQ06LT,127	Nexperia	55	75	3.7	2	95.6	300	TO-220AB	Obsolete
STP80NF55-06	STMicroelectronics	55	80	6.5	4	189	300	TO-220	Active
CSD18534KCS	Texas Instruments	60	100	9.5	2.3	24	107	TO-220-3	Active
STP60NF06L	STMicroelectronics	60	60	14	1	66	110	TO-220	Active

Engineering Selection Recommendations

Tier 1 - Preferred Direct Substitutes (55V, 75A, Active Status):

IRF1405ZPBF (Infineon Technologies) is the manufacturer-recommended substitute. This part maintains identical voltage and current ratings with improved on-state resistance (4.9 mOhm vs. 8 mOhm), resulting in lower conduction losses. ROHS3 compliant with active product status ensures long-term availability. Packaging is TO-220AB, matching the original footprint. Gate charge is slightly elevated (180 nC vs. 150 nC), which may increase switching losses marginally.

HUF75344P3 (onsemi UltraFET™ series) provides exact electrical equivalence with 8 mOhm on-state resistance matching the IRF3305. ROHS3 compliant and active status. Package is TO-220-3, which is mechanically compatible with TO-220AB in most applications. Power dissipation rating of 285W is slightly lower than the original 330W.

HUF75345P3 (onsemi UltraFET™ series) offers superior performance with 7 mOhm on-state resistance and 325W power dissipation rating, approaching the original specification. ROHS3 compliant and active status. TO-220-3 package. Gate charge of 275 nC is elevated, indicating higher switching losses.

STP80NF55-06 (STMicroelectronics STripFET™ II) provides 80A continuous current rating with 55V voltage rating, exceeding the original 75A specification. On-state resistance of 6.5 mOhm is superior. Power dissipation of 300W is compatible. ROHS3 compliant and active status. TO-220 package.

Tier 2 - Functional Alternatives (Modified Ratings, Active Status):

CSD18534KCS (Texas Instruments NexFET™) operates at 60V with 100A (Tc) continuous current, providing higher voltage and current margins. On-state resistance of 9.5 mOhm is acceptable. Gate charge of 24 nC is significantly lower, reducing switching losses. ROHS3 compliant and active status. Power dissipation of 107W is substantially lower than the original, limiting thermal headroom.

STP60NF06L (STMicroelectronics STripFET™ II) operates at 60V with 60A continuous current. On-state resistance of 14 mOhm is higher, increasing conduction losses. Power dissipation of 110W is significantly lower. ROHS3 compliant and active status. Suitable only for applications with reduced current requirements.

HUF75332P3 (onsemi UltraFET™) is rated for 55V and 60A, providing lower current capacity than the original 75A specification. On-state resistance of 19 mOhm is substantially higher. Power dissipation of 145W is significantly reduced. ROHS3 compliant and active status. Suitable only for applications with reduced current requirements.

Tier 3 - Obsolete Alternatives (Not Recommended for New Designs):

PHP191NQ06LT,127 (Nexperia TrenchMOS™) is classified as Obsolete, similar to the IRF3305. Although it provides 55V, 75A ratings with superior on-state resistance (3.7 mOhm), its obsolete status makes it unsuitable for long-term procurement.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace IRF3305 with IRF1405ZPBF without PCB modifications?

A: Yes. Both parts use TO-220AB packaging with identical pin configuration and electrical characteristics (55V, 75A). No PCB modifications are required. The improved on-state resistance (4.9 mOhm vs. 8 mOhm) reduces heat generation, which is beneficial. Gate charge is slightly higher (180 nC vs. 150 nC), requiring verification of gate driver capability if switching frequency exceeds 100 kHz.

Q2: What is the difference between TO-220AB and TO-220-3 packages?

A: Both are Through Hole TO-220 variants with three leads (Gate, Drain, Source). TO-220AB and TO-220-3 are mechanically and electrically compatible in most applications. Pin spacing and hole diameter are identical. The primary difference is in mounting tab design and thermal interface specifications. Verify PCB footprint compatibility before substitution.

Q3: Why do some substitutes have lower power dissipation ratings than the IRF3305?

A: Power dissipation rating depends on die size, thermal design, and package thermal resistance. Lower ratings do not indicate inferior performance but rather different thermal characteristics. For applications requiring the full 330W dissipation, select substitutes with equal or higher power ratings (HUF75345P3 at 325W, STP80NF55-06 at 300W, or PHP191NQ06LT,127 at 300W).

Q4: Is RoHS compliance mandatory for my application?

A: RoHS compliance is required for products sold in the European Union and many other regions. All recommended active substitutes (IRF1405ZPBF, HUF75344P3, HUF75345P3, STP80NF55-06, CSD18534KCS, STP60NF06L, HUF75332P3) are ROHS3 compliant. The original IRF3305 is RoHS non-compliant, making active substitutes preferable for regulatory compliance.

Q5: Can I use CSD18534KCS as a substitute if my application requires 75A at 55V?

A: CSD18534KCS is rated for 100A (Tc) at 60V, which exceeds the IRF3305 requirements. However, its power dissipation rating of 107W is significantly lower than the original 330W. This part is suitable only if your actual power dissipation is below 107W. Verify thermal calculations before selection.

Q6: Which substitute offers the best on-state resistance performance?

A: PHP191NQ06LT,127 provides the lowest on-state resistance at 3.7 mOhm, followed by IRF1405ZPBF at 4.9 mOhm and STP80NF55-06 at 6.5 mOhm. Lower on-state resistance reduces conduction losses and heat generation. However, PHP191NQ06LT,127 is obsolete. For active products, IRF1405ZPBF is the optimal choice for minimizing conduction losses.

Q7: What is gate charge and why does it matter?

A: Gate charge (Qg) is the total charge required to switch the MOSFET from off to on state. Lower gate charge reduces switching losses and allows faster switching speeds. The IRF3305 has 150 nC gate charge. Substitutes range from 24 nC (CSD18534KCS) to 275 nC (HUF75345P3). For high-frequency switching applications (>100 kHz), select substitutes with lower gate charge values.

Q8: Are there any compatibility issues with gate driver circuits?

A: Gate threshold voltage (Vgs(th)) and maximum gate-source voltage (Vgs Max) determine gate driver compatibility. The IRF3305 has Vgs(th) of 4V and Vgs Max of ±20V. Most substitutes maintain these specifications. CSD18534KCS and PHP191NQ06LT,127 have lower Vgs(th) values (2.3V and 2V respectively), which may require gate driver adjustment. STP60NF06L has Vgs Max of ±15V, which is more restrictive. Verify gate driver specifications before substitution.

Q9: Which substitute provides the best overall balance of performance and availability?

A: HUF75344P3 or HUF75345P3 (onsemi UltraFET™ series) provide optimal balance. Both are ROHS3 compliant, active status, 55V/75A rated, and TO-220-3 packaged. HUF75344P3 matches the original 8 mOhm on-state resistance exactly. HUF75345P3 offers superior 7 mOhm resistance with 325W power dissipation. Both have high inventory availability (21,910 and 25,800 units respectively).

Q10: Can I use a higher voltage-rated MOSFET (60V) in a 55V application?

A: Yes. Higher voltage ratings provide additional safety margin and are functionally compatible in 55V applications. CSD18534KCS (60V) and STP60NF06L (60V) can be used in 55V circuits. However, verify that on-state resistance and power dissipation ratings meet application requirements. Higher voltage MOSFETs typically have higher on-state resistance at the same current level.

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