IRL3705NSTRL N-Channel 55V 89A MOSFET D2PAK Equivalent & Substitute Parts

Part Overview

The IRL3705NSTRL is an N-Channel MOSFET manufactured by Infineon Technologies, part of the HEXFET® series. This device is rated for 55V drain-to-source voltage with 89A continuous drain current in a surface mount D2PAK package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The IRL3705NSTRL operates across a temperature range of -55°C to 175°C (TJ) and is suitable for high-current switching applications requiring low on-resistance performance. RoHS non-compliance status and unlimited moisture sensitivity level (MSL 1) are documented characteristics of this legacy component.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	89	A (Tc)
On-Resistance (Rds On) @ 46A, 10V	10	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2	V
Gate Charge (Qg) @ 5V	98	nC
Maximum Gate Voltage (Vgs)	±16	V
Input Capacitance (Ciss) @ 25V	3600	pF
Power Dissipation (Tc)	170	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitution of the IRL3705NSTRL is determined by the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must be equal to or greater than 55V
Continuous Drain Current (Id): Must be equal to or greater than 89A
Package Type: Must be D2PAK (TO-263-3) for mechanical and thermal compatibility
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Operating Temperature Range: Must support -55°C to 175°C (TJ)

Secondary Compatibility Parameters:

On-Resistance (Rds On): Lower values indicate improved performance; values at or below 10mOhm @ comparable current are acceptable
Gate Threshold Voltage (Vgs(th)): Threshold values between 2V and 4.7V are compatible with standard gate drive circuits
Maximum Gate Voltage (Vgs): Must support ±15V or greater for robust gate drive compatibility
Moisture Sensitivity Level (MSL): MSL 1 (Unlimited) is preferred for reliability

Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary specifications) and Manufacturer Recommended Substitutes (meeting or exceeding primary specifications with active product status or improved compliance).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Vgs Max (±V)	Package	Status	RoHS
IRL3705NSTRL	Infineon	55	89	10	2	98	16	D2PAK	Obsolete	Non-compliant
IRL3705NSTRLPBF	Infineon	55	89	10	2	98	16	D2PAK	Active	ROHS3
PSMN7R6-60BS,118	Nexperia	60	92	7.8	4	38.7	20	D2PAK	Active	ROHS3
BUK9612-55B,118	Nexperia	55	75	10	2	31	15	D2PAK	Active	ROHS3
IPB081N06L3GATMA1	Infineon	60	50	8.1	2.2	29	20	D2PAK	Active	ROHS3
IPB090N06N3GATMA1	Infineon	60	50	9	4	36	20	D2PAK	Active	ROHS3
BUK7610-55AL,118	Nexperia	55	75	10	4	124	20	D2PAK	Obsolete	ROHS3
PSMN015-60BS,118	Nexperia	60	50	14.8	4	20.9	20	D2PAK	Active	ROHS3
STB55NF06LT4	STMicroelectronics	60	55	18	4.7	37	16	D2PAK	Active	ROHS3
STB55NF06T4	STMicroelectronics	60	50	18	4	60	20	D2PAK	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

IRL3705NSTRLPBF is the direct parametric equivalent of the IRL3705NSTRL. This part maintains identical electrical specifications (55V, 89A, 10mOhm Rds On) and D2PAK packaging. The primary distinction is product status: IRL3705NSTRLPBF is active and ROHS3 compliant, whereas the original IRL3705NSTRL is obsolete and RoHS non-compliant. This substitution requires no circuit redesign and is suitable for direct board-level replacement.

Manufacturer Recommended Substitutes (Performance-Equivalent):

PSMN7R6-60BS,118 (Nexperia) exceeds the original specification with 60V rating and 92A continuous drain current. The on-resistance of 7.8mOhm is superior to the original 10mOhm, resulting in lower power dissipation and improved thermal performance. This part is active and ROHS3 compliant. The higher gate voltage rating (±20V) provides enhanced gate drive margin.

BUK9612-55B,118 (Nexperia) maintains the 55V rating with 75A continuous drain current. While the current rating is lower than the original 89A, the on-resistance remains at 10mOhm. This part is active, ROHS3 compliant, and carries AEC-Q101 automotive qualification. High inventory availability (500,400 pcs) supports production continuity.

Alternative Substitutes (Reduced Current Rating):

IPB081N06L3GATMA1 and IPB090N06N3GATMA1 (Infineon OptiMOS™ series) are rated for 50A continuous drain current, which is below the original 89A specification. These parts are suitable only for applications where the actual operating current does not exceed 50A. Both are active and ROHS3 compliant.

STB55NF06LT4 and STB55NF06T4 (STMicroelectronics STripFET™ II series) are rated for 55A and 50A respectively, also below the original 89A specification. These parts are active and ROHS3 compliant but require current derating analysis before selection.

Compliance and Certification:

All recommended active substitutes are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1). BUK7610-55AL,118 and BUK9612-55B,118 hold AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability documentation.

Frequently Asked Questions (FAQ)

Q: Can IRL3705NSTRLPBF be used as a direct replacement for IRL3705NSTRL?

A: Yes. IRL3705NSTRLPBF is a parametric equivalent with identical electrical specifications and D2PAK packaging. The only differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the primary advantage of PSMN7R6-60BS,118 over the original IRL3705NSTRL?

A: PSMN7R6-60BS,118 provides superior on-resistance (7.8mOhm vs. 10mOhm), resulting in lower power dissipation and improved thermal efficiency. The 60V rating provides additional voltage margin, and the part is active with ROHS3 compliance.

Q: Can I use BUK9612-55B,118 if my application requires 89A continuous current?

A: No. BUK9612-55B,118 is rated for 75A continuous drain current, which is 14A below the original specification. Use of this part in an 89A application would exceed its rated current and cause thermal stress and potential failure. Current derating analysis is required before selection.

Q: Are all substitute parts available in D2PAK packaging?

A: Yes. All substitute parts listed are available in D2PAK (TO-263-3) surface mount packaging, ensuring mechanical and thermal compatibility with the original IRL3705NSTRL footprint.

Q: What is the significance of RoHS compliance for substitute part selection?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances regulations. All active substitute parts are ROHS3 compliant, whereas the original IRL3705NSTRL is RoHS non-compliant. For new designs and procurement, ROHS3 compliant parts are required in most markets.

Q: Can I substitute a part with a lower gate charge (Qg) value?

A: Yes. Lower gate charge values (such as 31nC in BUK9612-55B,118 vs. 98nC in IRL3705NSTRL) indicate faster switching characteristics and reduced gate drive power requirements. This is a performance improvement, not a limitation.

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 is an automotive electronics council qualification standard for discrete semiconductors. Parts carrying this qualification (BUK7610-55AL,118 and BUK9612-55B,118) have undergone enhanced reliability testing and are approved for automotive use. This certification is required for automotive OEM applications.

Q: Is the operating temperature range identical across all substitute parts?

A: Yes. All substitute parts maintain the -55°C to 175°C (TJ) operating temperature range, ensuring thermal compatibility with the original IRL3705NSTRL across all environmental conditions.

Q: How do I determine if a substitute part is suitable for my specific application?

A: Compare the required specifications against the substitute part's datasheet: (1) Verify Vdss is equal to or greater than your circuit voltage; (2) Verify Id is equal to or greater than your maximum continuous current; (3) Confirm D2PAK packaging compatibility; (4) Verify operating temperature range covers your application environment; (5) Check RoHS and compliance requirements for your market.

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