IRLZ44ZSTRLPBF N-Channel 55V 51A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLZ44ZSTRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 51A continuous drain current in the D2PAK surface mount package. This device is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility within specified electrical and mechanical parameters while offering active product support and availability.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current @ 25°C (Id)	51	A
On-State Resistance @ 31A, 10V (Rds On Max)	13.5	mOhm
Gate Threshold Voltage @ 250µA (Vgs(th) Max)	3	V
Gate Charge @ 5V (Qg Max)	36	nC
Power Dissipation (Tc)	80	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the IRLZ44ZSTRLPBF are selected based on the following electrical and mechanical compatibility criteria:

Primary Substitution Parameters:

Drain-to-Source Voltage (Vdss): 55V or higher
Continuous Drain Current (Id): 50A or higher at 25°C
Package Type: D2PAK (TO-263-3) surface mount
Mounting Type: Surface mount
Operating Temperature Range: -55°C to 175°C minimum
RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Factors:

On-State Resistance (Rds On): Lower or equivalent values preferred
Gate Threshold Voltage (Vgs(th)): Within ±1V of original specification
Gate Charge (Qg): Values up to 190nC acceptable for switching applications
Power Dissipation: 80W or higher

Substitute parts are grouped into two categories: direct equivalents (same voltage and current ratings) and functional substitutes (higher voltage or current ratings that operate within the same application envelope).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Vgs(th) Max (V)	Qg Max (nC)	Power Diss. (W)	Package	Status
IRLZ44ZSTRLPBF	Infineon	55	51	13.5	3	36	80	D2PAK	Obsolete
STB150NF55T4	STMicroelectronics	55	120	6	4	190	300	D2PAK	Active
STB85NF55T4	STMicroelectronics	55	80	8	4	142	300	D2PAK	Active
STB85NF55LT4	STMicroelectronics	55	80	8	2.5	110	300	D2PAK	Active
PSMN7R6-60BS,118	Nexperia USA Inc.	60	92	7.8	4	38.7	149	D2PAK	Active
PSMN015-60BS,118	Nexperia USA Inc.	60	50	14.8	4	20.9	86	D2PAK	Active
STB55NF06T4	STMicroelectronics	60	50	18	4	60	110	D2PAK	Active
STB55NF06LT4	STMicroelectronics	60	55	18	4.7	37	95	D2PAK	Active
IRLZ44SPBF	Vishay Siliconix	60	50	28	2	66	150	D2PAK	Active
IRLZ44STRRPBF	Vishay Siliconix	60	50	28	2	66	150	D2PAK	Active
IPB50N10S3L16ATMA1	Infineon Technologies	100	50	15.4	2.4	64	100	D2PAK	Active

Engineering Selection Recommendations

Direct Voltage Rating Substitutes (55V):

STB150NF55T4, STB85NF55T4, and STB85NF55LT4 from STMicroelectronics maintain the 55V Vdss rating of the original IRLZ44ZSTRLPBF. These parts are classified as active products with full manufacturer support. STB150NF55T4 provides the highest current rating (120A) and lowest on-state resistance (6mOhm), suitable for applications requiring enhanced current handling. STB85NF55T4 and STB85NF55LT4 offer 80A ratings with improved power dissipation (300W vs. 80W), with STB85NF55LT4 featuring a lower gate threshold voltage (2.5V) for reduced drive requirements.

60V Voltage Rating Substitutes:

PSMN7R6-60BS,118 and PSMN015-60BS,118 from Nexperia USA Inc., along with STB55NF06T4, STB55NF06LT4, IRLZ44SPBF, and IRLZ44STRRPBF from Vishay Siliconix, operate at 60V Vdss. These parts are suitable for applications where the 55V rating of the original device provides adequate margin. PSMN7R6-60BS,118 delivers 92A continuous current with 7.8mOhm on-state resistance. PSMN015-60BS,118 matches the 50A current rating with 14.8mOhm resistance. Vishay parts (IRLZ44SPBF and IRLZ44STRRPBF) are identical specifications with different packaging (Tube vs. Tape & Reel).

Higher Voltage Substitute (100V):

IPB50N10S3L16ATMA1 from Infineon Technologies operates at 100V Vdss with 50A continuous current. This part is classified as active product status and provides additional voltage margin for applications subject to transient overvoltage conditions. The 15.4mOhm on-state resistance and 100W power dissipation are comparable to the original specification.

All recommended substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance of the original part.

Frequently Asked Questions (FAQ)

Q: Can STB150NF55T4 replace IRLZ44ZSTRLPBF in all applications?

A: STB150NF55T4 maintains the same 55V Vdss rating and exceeds the 51A current requirement with 120A capability. The lower on-state resistance (6mOhm vs. 13.5mOhm) reduces power dissipation. However, the higher gate charge (190nC vs. 36nC) requires verification of gate drive circuit capability. The higher threshold voltage (4V vs. 3V) may affect switching speed in low-voltage gate drive circuits.

Q: What is the difference between IRLZ44SPBF and IRLZ44STRRPBF?

A: Both parts are identical in electrical specifications (60V, 50A, 28mOhm Rds On). The difference is packaging: IRLZ44SPBF is supplied in Tube packaging, while IRLZ44STRRPBF is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume handling.

Q: Why does PSMN7R6-60BS,118 have lower on-state resistance than the original part?

A: PSMN7R6-60BS,118 is rated for 92A continuous current compared to 51A for IRLZ44ZSTRLPBF. The lower on-state resistance (7.8mOhm) is a result of larger die area and optimized channel design for higher current handling. This provides improved efficiency in high-current applications.

Q: Is IPB50N10S3L16ATMA1 suitable for 55V applications?

A: IPB50N10S3L16ATMA1 is rated for 100V Vdss, which exceeds the 55V requirement of the original application. This part is suitable for 55V operation and provides additional voltage margin for transient protection. The 50A current rating matches the original specification. Verify that the higher gate charge (64nC) is compatible with the gate drive circuit.

Q: Are all substitute parts available in the same D2PAK package?

A: All recommended substitute parts use the D2PAK (TO-263-3) surface mount package with identical pinout and thermal tab configuration. Package compatibility is confirmed across all substitutes listed.

Q: What is the impact of different gate threshold voltages on circuit performance?

A: Gate threshold voltage (Vgs(th)) affects the minimum gate voltage required to turn on the device. Original IRLZ44ZSTRLPBF specifies 3V maximum. Substitutes range from 2V (IRLZ44SPBF, IRLZ44STRRPBF) to 4.7V (STB55NF06LT4). Lower threshold voltages enable operation with lower gate drive voltages, while higher values require stronger drive circuits. Verify gate drive voltage compatibility with selected substitute.

Q: Can 60V-rated parts be used in 55V applications?

A: Yes. 60V-rated MOSFETs operate safely in 55V applications. The voltage rating represents the maximum drain-to-source voltage the device can withstand. Operating at 55V provides margin below the 60V maximum rating. Confirm that the application does not experience transient voltages exceeding 60V.

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