IRLZ44STRR N-Channel MOSFET 60V 50A D2PAK Equivalent & Substitute Parts

Part Overview

The IRLZ44STRR is an N-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Vishay Siliconix, rated for 60V drain-to-source voltage and 50A continuous drain current in a surface mount D2PAK (TO-263) package. This device is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and compliance requirements.

Substiute Parts

IRLZ44STRR

Vishay SiliconixIn Stock: 2956IRLZ44STRR Datasheet

Current PartRFQ

IRLZ44STRRPBF

Vishay SiliconixIn Stock: 4085IRLZ44STRRPBF Datasheet

MFR RecommendedRFQ

IRLZ44NSTRLPBF

Infineon TechnologiesIn Stock: 16931IRLZ44NSTRLPBF Datasheet

MFR RecommendedRFQ

IRLZ44ZSTRLPBF

Infineon TechnologiesIn Stock: 2504IRLZ44ZSTRLPBF Datasheet

MFR RecommendedRFQ

NTBV45N06LT4G

onsemiIn Stock: 760NTBV45N06LT4G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IRLZ44STRR is determined by the following critical parameters:

Voltage Rating (Vdss): Substitute parts must equal or exceed 60V to maintain safe operation under maximum rated conditions.

Continuous Drain Current (Id): Substitute parts must equal or exceed 50A at 25°C to support the same load conditions.

On-State Resistance (Rds On): Substitute parts must not exceed 28 mOhm at the specified gate voltage and current to maintain thermal performance and power dissipation characteristics.

Gate Threshold Voltage (Vgs(th)): Substitute parts must not exceed 2V at 250µA to ensure compatible gate drive requirements.

Package Type: All substitute parts must use D2PAK (TO-263) surface mount packaging to maintain mechanical and thermal interface compatibility.

Operating Temperature Range: Substitute parts must support the full -55°C to 175°C junction temperature range.

Compliance Status: RoHS and REACH compliance status is documented for each substitute to support regulatory requirements in target applications.

The following substitute parts meet these criteria within allowable tolerances:

• IRLZ44STRRPBF (Vishay Siliconix): Identical electrical specifications; Active product status; RoHS3 compliant; Tape & Reel packaging.
• IRLZ44NSTRLPBF (Infineon Technologies): Vdss 55V (acceptable margin below 60V rating); Id 47A (acceptable margin below 50A rating); Rds On 22 mOhm (superior performance); Not For New Designs status.
• IRLZ44ZSTRLPBF (Infineon Technologies): Vdss 55V; Id 51A (meets requirement); Rds On 13.5 mOhm (superior performance); Obsolete status.
• NTBV45N06LT4G (onsemi): Vdss 60V (meets requirement); Id 45A (acceptable margin below 50A rating); Rds On 28 mOhm (meets requirement); Active product status; RoHS3 compliant.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: IRLZ44STRRPBF

The IRLZ44STRRPBF is the direct electrical equivalent of the IRLZ44STRR, manufactured by Vishay Siliconix with identical specifications across all critical parameters. This part carries Active product status, ensuring long-term availability and supply chain stability. RoHS3 compliance supports regulatory requirements in modern applications. Tape & Reel packaging accommodates automated assembly processes. This substitute is suitable for direct replacement in all applications where the IRLZ44STRR was originally specified.

Secondary Recommendation: NTBV45N06LT4G

The NTBV45N06LT4G, manufactured by onsemi, provides an alternative from a different supplier with Active product status. This device maintains the 60V voltage rating and 28 mOhm on-state resistance specification. The 45A continuous drain current rating represents a 10% reduction from the original 50A specification; this margin is acceptable for applications where the design does not operate at the absolute maximum current limit. RoHS3 compliance and D2PAK packaging ensure compatibility with modern manufacturing and regulatory standards.

Tertiary Consideration: IRLZ44NSTRLPBF

The IRLZ44NSTRLPBF, manufactured by Infineon Technologies, offers superior electrical performance with lower on-state resistance (22 mOhm) and reduced gate charge (48 nC). However, this device carries Not For New Designs status, limiting its suitability for new product development. The 55V voltage rating and 47A current rating represent acceptable margins for applications not operating at absolute maximum specifications. This substitute is appropriate only for legacy system maintenance where supply of the original part is unavailable.

Not Recommended: IRLZ44ZSTRLPBF

The IRLZ44ZSTRLPBF carries Obsolete product status, which does not resolve the supply continuity issue presented by the original IRLZ44STRR. While this device offers superior electrical performance, its obsolescence status makes it unsuitable for long-term design support.

Frequently Asked Questions (FAQ)

Q: Can the IRLZ44STRRPBF be used as a direct replacement for the IRLZ44STRR?

A: Yes. The IRLZ44STRRPBF is electrically and mechanically identical to the IRLZ44STRR across all specified parameters. Both devices are rated for 60V, 50A, with 28 mOhm on-state resistance in D2PAK packaging. The primary difference is product status: IRLZ44STRRPBF is Active, while IRLZ44STRR is Obsolete. No circuit modifications are required.

Q: What is the significance of the voltage rating difference between 60V and 55V?

A: The voltage rating represents the maximum drain-to-source voltage the device can withstand without breakdown. A 60V-rated device can safely operate at 60V; a 55V-rated device is rated only to 55V. For applications operating below 55V, either rating is acceptable. For applications requiring the full 60V margin, only 60V-rated devices (IRLZ44STRR, IRLZ44STRRPBF, NTBV45N06LT4G) are appropriate.

Q: How does the 45A rating of the NTBV45N06LT4G compare to the 50A rating of the IRLZ44STRR?

A: The NTBV45N06LT4G is rated for 45A continuous drain current, compared to 50A for the IRLZ44STRR. This represents a 10% reduction in current capacity. If the application design operates at or near 50A, the NTBV45N06LT4G may not provide adequate margin. If the application operates below 45A, the NTBV45N06LT4G is suitable. Review the actual operating current in your circuit to determine compatibility.

Q: What does "Not For New Designs" status mean for the IRLZ44NSTRLPBF?

A: "Not For New Designs" indicates that the manufacturer (Infineon Technologies) is not recommending this part for new product development. The device remains available and functional, but the manufacturer is directing customers toward alternative parts for future designs. This status does not affect the electrical performance of existing units but signals reduced long-term support and potential future discontinuation.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use D2PAK (TO-263) surface mount packaging, which is mechanically and thermally compatible with the original IRLZ44STRR. However, packaging type (Tape & Reel, Cut Tape, or Bulk) varies by supplier and part number. Verify the specific packaging format required for your assembly process when ordering.

Q: What is the impact of RoHS compliance on part selection?

A: RoHS3 compliance indicates that the device meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original IRLZ44STRR is RoHS non-compliant. All recommended substitutes (IRLZ44STRRPBF, IRLZ44NSTRLPBF, IRLZ44ZSTRLPBF, NTBV45N06LT4G) are RoHS3 compliant. For applications subject to RoHS requirements, compliant substitutes are mandatory. For legacy applications without RoHS requirements, compliance status does not affect electrical performance.

Q: Can gate drive circuits designed for the IRLZ44STRR be used with substitute parts?

A: Gate threshold voltage (Vgs(th)) is the primary gate drive parameter. The IRLZ44STRR, IRLZ44STRRPBF, IRLZ44NSTRLPBF, and NTBV45N06LT4G all specify 2V maximum threshold voltage, ensuring compatible gate drive requirements. The IRLZ44ZSTRLPBF specifies 3V maximum threshold voltage, which is slightly higher but remains within typical gate drive circuit margins. Existing gate drive circuits designed for the IRLZ44STRR are compatible with all listed substitutes.

Q: How do differences in gate charge (Qg) affect circuit performance?

A: Gate charge determines the energy required to switch the device on and off. The IRLZ44STRR specifies 66 nC at 5V; substitute parts range from 32 nC to 66 nC. Lower gate charge reduces switching losses and allows faster switching speeds. If the original circuit was designed with gate drive capability sufficient for 66 nC, substitutes with lower gate charge (IRLZ44NSTRLPBF at 48 nC, IRLZ44ZSTRLPBF at 36 nC, NTBV45N06LT4G at 32 nC) will operate with improved efficiency. No circuit modification is required.

Q: What inventory considerations apply to these substitutes?

A: IRLZ44STRRPBF (4006 Pcs), IRLZ44NSTRLPBF (16886 Pcs), IRLZ44ZSTRLPBF (2440 Pcs), and NTBV45N06LT4G (704 Pcs) are currently in stock. IRLZ44STRRPBF offers the highest inventory level among direct equivalents. For applications requiring immediate availability, IRLZ44NSTRLPBF provides the largest stock quantity, though it carries Not For New Designs status.