IRL3705ZPBF N-Channel 55V 75A MOSFET Equivalent & Substitute Parts

Part Overview

The IRL3705ZPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 75A continuous drain current in a TO-220AB through-hole package. This device belongs to the HEXFET® series and is classified as "Not For New Designs," indicating it has been superseded by newer alternatives. The part operates across a temperature range of -55°C to 175°C and dissipates up to 130W at the case temperature. Due to its obsolescence status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, maintenance, and new system designs requiring compatible performance characteristics.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	75	A
On-State Resistance (Rds On) @ 52A, 10V	8	mOhm
Gate-Source Threshold Voltage (Vgs(th)) @ 250µA	3	V
Gate Charge (Qg) @ 5V	60	nC
Power Dissipation (Max)	130	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220AB	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IRL3705ZPBF is determined by strict alignment of the following 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 75A at 25°C
Package Type: TO-220 or TO-220AB (through-hole, three-pin configuration)
Operating Temperature Range: Must span -55°C to 175°C minimum
FET Type: N-Channel MOSFET technology

Secondary Compatibility Parameters:

On-State Resistance (Rds On): Lower or equal values indicate improved performance
Gate Charge (Qg): Affects switching speed and drive circuit requirements
Power Dissipation: Higher ratings provide thermal margin
Vgs(th): Gate threshold voltage must be compatible with existing drive circuits

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with active product status) and Enhanced Alternatives (exceeding performance specifications while maintaining compatibility).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Diss. (W)	Package	Status
IRL3705ZPBF	Infineon	55	75	8	60	130	TO-220AB	Not For New Designs
HUF75332P3	onsemi	55	60	19	85	145	TO-220-3	Active
HUF75339P3	onsemi	55	75	12	130	200	TO-220-3	Active
HUF75344P3	onsemi	55	75	8	210	285	TO-220-3	Active
HUF75345P3	onsemi	55	75	7	275	325	TO-220-3	Active
IXTP90N055T2	IXYS	55	90	8.4	42	150	TO-220-3	Active
PHP191NQ06LT,127	Nexperia	55	75	3.7	95.6	300	TO-220AB	Obsolete
STP60NF06L	STMicroelectronics	60	60	14	66	110	TO-220	Active
STP76NF75	STMicroelectronics	75	80	11	160	300	TO-220	Active
STP80NF55-06	STMicroelectronics	55	80	6.5	189	300	TO-220	Active

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Recommended for New Designs)

HUF75344P3 and HUF75345P3 from onsemi are the primary recommended substitutes. Both devices match the IRL3705ZPBF in Vdss (55V) and Id (75A) specifications while maintaining active product status. HUF75344P3 provides identical on-state resistance (8 mOhm) and is available in high inventory (21,910 pcs). HUF75345P3 offers superior performance with lower Rds On (7 mOhm) and higher power dissipation rating (325W). Both are ROHS3 compliant and operate across the required temperature range (-55°C to 175°C). The onsemi UltraFET™ series represents current-generation technology with established supply chain availability.

Tier 2: Performance-Enhanced Alternatives

IXTP90N055T2 (IXYS TrenchT2™) exceeds the current rating at 90A while maintaining 55V Vdss and TO-220-3 packaging. This device provides additional current margin and lower gate charge (42 nC), enabling faster switching. STP80NF55-06 (STMicroelectronics STripFET™ II) matches the 55V/80A specification with superior on-state resistance (6.5 mOhm) and 300W power dissipation. Both alternatives are active products with ROHS3 compliance.

Tier 3: Conditional Substitutes

HUF75332P3 is suitable only for applications where 60A continuous current is acceptable, as it falls below the 75A requirement. STP60NF06L similarly operates at 60A and 60V, making it unsuitable for full-specification replacement. STP76NF75 operates at 75V Vdss, exceeding the 55V rating and introducing unnecessary voltage stress margin.

Compliance and Certification: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing. Moisture sensitivity levels are consistent (MSL 1 or Not Applicable). All parts are classified under ECCN EAR99 and HTSUS 8541.29.0095.

Frequently Asked Questions (FAQ)

Q: Can HUF75344P3 directly replace IRL3705ZPBF without circuit modifications?

A: Yes. HUF75344P3 matches the critical electrical parameters: 55V Vdss, 75A Id, and 8 mOhm Rds On. Both use TO-220-3 through-hole packaging with identical pin configuration. Gate threshold voltage (4V vs. 3V) is within acceptable drive circuit tolerance. No modifications are required for standard applications.

Q: What is the difference between TO-220AB and TO-220-3 packaging?

A: Both are three-pin through-hole packages with identical electrical connectivity (Gate, Drain, Source). TO-220AB and TO-220-3 designations refer to the same physical form factor. All substitute parts listed use compatible TO-220 variants suitable for direct PCB mounting replacement.

Q: Why does HUF75345P3 have higher gate charge than HUF75344P3?

A: Gate charge (Qg) increases with improved on-state resistance performance. HUF75345P3 achieves lower Rds On (7 mOhm vs. 8 mOhm) through enhanced die design, resulting in higher input capacitance and gate charge (275 nC vs. 210 nC). This requires slightly higher drive current but delivers lower conduction losses.

Q: Is IXTP90N055T2 suitable for applications requiring exactly 75A?

A: Yes. IXTP90N055T2 is rated for 90A continuous current, providing 20% additional margin above the 75A requirement. The 55V Vdss matches exactly. Lower gate charge (42 nC) enables faster switching compared to the original part. This device is suitable for applications where current margin and switching performance are beneficial.

Q: Why is PHP191NQ06LT,127 listed as Obsolete?

A: PHP191NQ06LT,127 from Nexperia is classified as Obsolete product status, indicating it is no longer recommended for new designs despite meeting electrical specifications. Although it provides superior on-state resistance (3.7 mOhm) and matches 55V/75A ratings, supply continuity cannot be guaranteed. Active alternatives (HUF75344P3, HUF75345P3) are preferred for new applications.

Q: Can STP76NF75 replace IRL3705ZPBF in a 55V circuit?

A: STP76NF75 operates at 75V Vdss, exceeding the 55V circuit requirement. While electrically compatible, this introduces unnecessary voltage stress margin and is not recommended as a direct replacement. Use STP80NF55-06 instead, which matches the 55V specification exactly while providing superior performance characteristics.

Q: What thermal considerations apply when substituting to higher power-rated devices?

A: Higher power dissipation ratings (e.g., HUF75345P3 at 325W vs. IRL3705ZPBF at 130W) indicate improved thermal performance under identical operating conditions. Substitution to higher-rated devices does not require thermal design changes; existing heatsinks remain adequate. Lower on-state resistance in substitute parts reduces conduction losses, improving overall thermal performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant certification, matching the original IRL3705ZPBF compliance status. REACH unaffected status is consistent across all alternatives, ensuring regulatory compatibility for EU and international markets.

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