IRLZ44NSTRR N-Channel MOSFET 55V 47A D2PAK Equivalent & Substitute Parts

Part Overview

The IRLZ44NSTRR is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 47A continuous drain current in D2PAK surface mount packaging. This device is classified as Obsolete, indicating it is no longer in active production. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility through matching or superior electrical and mechanical parameters within the D2PAK package family.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	55	V
Current - Continuous Drain (Id) @ 25°C	47	A (Tc)
Rds On (Max) @ Id, Vgs	22	mOhm @ 25A, 10V
Vgs(th) (Max) @ Id	2	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	48	nC @ 5V
Vgs (Max)	±16	V
Input Capacitance (Ciss) (Max) @ Vds	1700	pF @ 25V
Power Dissipation (Max)	3.8 (Ta), 110 (Tc)	W
Operating Temperature	-55 to 175	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the IRLZ44NSTRR is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Substitute parts must equal or exceed 55V
Continuous Drain Current (Id): Substitute parts must equal or exceed 47A at 25°C
On-State Resistance (Rds On): Lower or equal values ensure equivalent or improved performance
Gate Threshold Voltage (Vgs(th)): Must remain within compatible switching characteristics
Gate Charge (Qg): Lower values reduce switching losses
Maximum Gate Voltage (Vgs): Must accommodate circuit drive requirements

Mechanical Compatibility Criteria:

Package Type: All substitutes must use D2PAK (TO-263-3) surface mount packaging
Mounting Type: Surface mount configuration required
Pin Configuration: 2 Leads + Tab standard for D2PAK

Compliance Criteria:

RoHS Status: Active substitutes preferably ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited) maintained across all options
Product Status: Active or Not For New Designs acceptable; Obsolete status avoided

Substitute parts are grouped into two categories: Parametric Equivalents (matching core electrical specifications) and Manufacturer Recommended alternatives (enhanced performance within compatible voltage and current ratings).

Parameter Comparison

Parameter	IRLZ44NSTRR (Main)	IRLZ44NSTRLPBF	IRLZ44SPBF	IRLZ44STRRPBF	PSMN015-60BS,118	STB55NF06LT4
Manufacturer	Infineon	Infineon	Vishay Siliconix	Vishay Siliconix	Nexperia USA Inc.	STMicroelectronics
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	55	55	60	60	60	60
Id @ 25°C (A)	47	47	50	50	50	55
Rds On (Max) (mOhm)	22 @ 25A, 10V	22 @ 25A, 10V	28 @ 31A, 5V	28 @ 31A, 5V	14.8 @ 15A, 10V	18 @ 27.5A, 10V
Vgs(th) (Max) (V)	2 @ 250µA	2 @ 250µA	2 @ 250µA	2 @ 250µA	4 @ 1mA	4.7 @ 250µA
Gate Charge Qg (Max) (nC)	48 @ 5V	48 @ 5V	66 @ 5V	66 @ 5V	20.9 @ 10V	37 @ 4.5V
Vgs (Max) (V)	±16	±16	±10	±10	±20	±16
Ciss (Max) (pF)	1700 @ 25V	1700 @ 25V	3300 @ 25V	3300 @ 25V	1220 @ 30V	1700 @ 25V
Power Dissipation (W)	3.8 (Ta), 110 (Tc)	3.8 (Ta), 110 (Tc)	3.7 (Ta), 150 (Tc)	3.7 (Ta), 150 (Tc)	86 (Tc)	95 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	D2PAK	D2PAK	D2PAK	D2PAK	D2PAK	D2PAK
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

IRLZ44NSTRLPBF from Infineon Technologies provides direct parametric equivalence to the IRLZ44NSTRR. This part maintains identical electrical specifications including 55V Vdss, 47A continuous drain current, 22mOhm Rds On, and 48nC gate charge. The primary distinction is product status: IRLZ44NSTRLPBF is classified as Not For New Designs but remains available with 16,886 pieces in stock. Packaging is Cut Tape (CT) & Digi-Reel®. RoHS3 compliance is achieved. This option is suitable for legacy system maintenance and repair applications where exact parameter matching is required.

Manufacturer Recommended Alternatives (Enhanced Performance):

IRLZ44SPBF and IRLZ44STRRPBF from Vishay Siliconix both offer enhanced specifications with 60V Vdss and 50A continuous drain current, exceeding the main part's 55V/47A ratings. Both maintain D2PAK packaging and -55°C to 175°C operating temperature range. IRLZ44SPBF is supplied in Tube packaging with 1,448 pieces available. IRLZ44STRRPBF is supplied in Tape & Reel (TR) with 4,006 pieces available. Both achieve ROHS3 compliance and Active product status. These parts are suitable for new designs requiring higher voltage and current headroom.

PSMN015-60BS,118 from Nexperia USA Inc. provides superior on-state resistance of 14.8mOhm at 15A/10V, significantly lower than the main part's 22mOhm specification. This part offers 60V Vdss, 50A continuous drain current, and 86W power dissipation at Tc. Gate charge is reduced to 20.9nC, improving switching efficiency. Supplied in Tape & Reel with 12,675 pieces in stock. ROHS3 compliant and Active status. Suitable for applications prioritizing low conduction losses and thermal performance.

STB55NF06LT4 from STMicroelectronics (STripFET™ II series) provides the highest continuous drain current rating at 55A with 60V Vdss. On-state resistance is 18mOhm at 27.5A/10V. Power dissipation reaches 95W at Tc. Gate charge is 37nC at 4.5V. Supplied in Cut Tape (CT) & Digi-Reel® with 1,311 pieces available. ROHS3 compliant and Active status. Suitable for high-current applications requiring maximum current capacity within D2PAK thermal constraints.

Selection Criteria by Application:

For legacy system support with exact parameter matching: IRLZ44NSTRLPBF.

For new designs with standard performance requirements and improved compliance: IRLZ44SPBF or IRLZ44STRRPBF.

For applications requiring minimized conduction losses: PSMN015-60BS,118.

For applications requiring maximum current capacity: STB55NF06LT4.

All substitute parts maintain D2PAK surface mount packaging, MSL 1 moisture sensitivity, and -55°C to 175°C operating temperature range. All achieve ROHS3 compliance except the main part (IRLZ44NSTRR), which is RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can IRLZ44NSTRLPBF directly replace IRLZ44NSTRR in existing designs?

A: Yes. IRLZ44NSTRLPBF is a parametric equivalent with identical electrical specifications: 55V Vdss, 47A continuous drain current, 22mOhm Rds On, and 48nC gate charge. Both use D2PAK packaging. The primary difference is product status (Not For New Designs vs. Obsolete) and packaging format (Cut Tape & Digi-Reel® vs. standard). Pin configuration and electrical performance are identical.

Q: Why do some substitute parts have higher Vdss ratings (60V vs. 55V)?

A: Higher Vdss ratings provide increased voltage margin and design flexibility. A 60V-rated device can safely operate in circuits designed for 55V operation, offering improved reliability under transient overvoltage conditions. This is a beneficial characteristic for substitution, not a limitation.

Q: What is the significance of lower Rds On values in substitute parts?

A: Lower on-state resistance reduces conduction losses and heat generation. PSMN015-60BS,118 with 14.8mOhm Rds On dissipates less power than the main part's 22mOhm specification at equivalent current levels. This improves thermal performance and efficiency, particularly in high-current applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (IRLZ44NSTRLPBF, IRLZ44SPBF, IRLZ44STRRPBF, PSMN015-60BS,118, and STB55NF06LT4) are ROHS3 Compliant. The main part IRLZ44NSTRR is RoHS non-compliant. Substitution with any listed alternative improves regulatory compliance for new designs.

Q: Can I use IRLZ44SPBF or IRLZ44STRRPBF in place of IRLZ44NSTRR?

A: Yes. Both parts are functionally compatible. They provide higher voltage (60V vs. 55V) and current (50A vs. 47A) ratings, making them suitable drop-in replacements. Both maintain D2PAK packaging and -55°C to 175°C operating temperature. IRLZ44SPBF is supplied in Tube; IRLZ44STRRPBF is supplied in Tape & Reel. Verify packaging requirements for your procurement process.

Q: What is the difference between IRLZ44SPBF and IRLZ44STRRPBF?

A: Both parts are electrically identical with 60V Vdss, 50A continuous drain current, and 28mOhm Rds On. The difference is packaging format: IRLZ44SPBF is supplied in Tube; IRLZ44STRRPBF is supplied in Tape & Reel (TR). Select based on your assembly process requirements. Tape & Reel format is typically preferred for automated pick-and-place assembly.

Q: Which substitute part offers the best thermal performance?

A: STB55NF06LT4 provides the highest power dissipation rating at 95W (Tc), followed by IRLZ44SPBF and IRLZ44STRRPBF at 150W (Tc). PSMN015-60BS,118 achieves 86W (Tc) but with significantly lower Rds On (14.8mOhm), reducing self-generated heat. For thermal-limited applications, STB55NF06LT4 or PSMN015-60BS,118 are recommended.

Q: Are there any gate voltage (Vgs) compatibility concerns?

A: The main part IRLZ44NSTRR accepts ±16V gate voltage. IRLZ44NSTRLPBF also accepts ±16V. IRLZ44SPBF and IRLZ44STRRPBF accept ±10V, which is narrower but compatible with standard 5V and 10V gate drive circuits. PSMN015-60BS,118 accepts ±20V, providing the widest margin. STB55NF06LT4 accepts ±16V. Verify your gate drive voltage does not exceed the substitute part's Vgs (Max) specification.

Q: What is the inventory status for each substitute part?

A: IRLZ44NSTRLPBF: 16,886 pieces. IRLZ44SPBF: 1,448 pieces. IRLZ44STRRPBF: 4,006 pieces. PSMN015-60BS,118: 12,675 pieces. STB55NF06LT4: 1,311 pieces. PSMN015-60BS,118 and IRLZ44NSTRLPBF offer the highest availability. Confirm current inventory with your supplier before finalizing procurement decisions.

Q: Can I mix different substitute parts in the same circuit board design?

A: All substitute parts maintain D2PAK packaging and compatible electrical characteristics within the specified parameter ranges. However, mixing different manufacturers or part numbers in the same design is not recommended. Select a single substitute part for consistency in thermal behavior, switching characteristics, and long-term supply chain management. If multiple parts must be used, ensure they are electrically and thermally equivalent through detailed circuit analysis.

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