IRLZ44NSPBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRLZ44NSPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage with 47A continuous drain current in D2PAK surface mount packaging. This device is part of the HEXFET® series and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

The IRLZ44NSPBF serves in switching applications requiring moderate voltage and high current handling in compact surface mount form factors. Equivalent substitutes must maintain compatibility with D2PAK packaging and preserve critical electrical characteristics within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	47	A (Tc)
On-Resistance (Rds On Max) @ Id, Vgs	22 mOhm @ 25A, 10V	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ Id	2	V @ 250µA
Gate Charge (Qg Max) @ Vgs	48	nC @ 5V
Maximum Gate Voltage (Vgs Max)	±16	V
Input Capacitance (Ciss Max) @ Vds	1700	pF @ 25V
Power Dissipation (Max)	3.8 (Ta), 110 (Tc)	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the IRLZ44NSPBF is determined by the following critical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Minimum 55V required; higher ratings acceptable
Continuous Drain Current (Id): Minimum 47A required; higher ratings acceptable
Package Type: D2PAK (TO-263-3) surface mount mandatory
Operating Temperature Range: -55°C to 175°C minimum required
RoHS3 Compliance: Required for regulatory alignment
Moisture Sensitivity Level: MSL 1 acceptable

Secondary Electrical Considerations:

On-Resistance (Rds On): Lower values improve efficiency; values up to 28 mOhm acceptable
Gate Charge (Qg): Lower values reduce switching losses; values up to 66 nC acceptable
Input Capacitance (Ciss): Affects gate drive requirements; values up to 3300 pF acceptable
Gate Threshold Voltage (Vgs(th)): Range 2V to 4.7V acceptable for standard gate drive circuits
Maximum Gate Voltage (Vgs Max): ±10V to ±20V acceptable for standard gate drive protection

All identified substitute parts meet or exceed the primary compatibility criteria and operate within acceptable ranges for secondary electrical parameters.

Parameter Comparison

Parameter	IRLZ44NSPBF (Main)	IRLZ44SPBF	IRLZ44STRRPBF	PSMN015-60BS,118	STB55NF06LT4	STB55NF06T4
Manufacturer	Infineon	Vishay Siliconix	Vishay Siliconix	Nexperia USA Inc.	STMicroelectronics	STMicroelectronics
Vdss (V)	55	60	60	60	60	60
Id @ 25°C (A)	47	50	50	50	55	50
Rds On Max (mOhm)	22 @ 25A, 10V	28 @ 31A, 5V	28 @ 31A, 5V	14.8 @ 15A, 10V	18 @ 27.5A, 10V	18 @ 27.5A, 10V
Vgs(th) Max (V)	2 @ 250µA	2 @ 250µA	2 @ 250µA	4 @ 1mA	4.7 @ 250µA	4 @ 250µA
Qg Max (nC)	48 @ 5V	66 @ 5V	66 @ 5V	20.9 @ 10V	37 @ 4.5V	60 @ 10V
Vgs Max (V)	±16	±10	±10	±20	±16	±20
Ciss Max (pF)	1700 @ 25V	3300 @ 25V	3300 @ 25V	1220 @ 30V	1700 @ 25V	1300 @ 25V
Power Dissipation Max (W)	3.8 (Ta), 110 (Tc)	3.7 (Ta), 150 (Tc)	3.7 (Ta), 150 (Tc)	86 (Tc)	95 (Tc)	110 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	D2PAK	TO-263 (D2PAK)	TO-263 (D2PAK)	D2PAK	D2PAK	D2PAK
Packaging Format	Tube	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®
Product Status	Discontinued	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	2305 Pcs	1448 Pcs	4006 Pcs	12675 Pcs	1311 Pcs	18852 Pcs

Engineering Selection Recommendations

IRLZ44SPBF (Vishay Siliconix)

This substitute maintains the IRLZ44 base product number and is manufactured by Vishay Siliconix. It provides 60V Vdss rating with 50A continuous drain current, exceeding the IRLZ44NSPBF specifications. The device is active in production with ROHS3 compliance and MSL 1 rating. Gate threshold voltage remains at 2V, matching the original part's low gate drive requirements. Higher input capacitance (3300 pF vs. 1700 pF) and gate charge (66 nC vs. 48 nC) require verification in gate drive circuits with marginal timing margins. Suitable for direct replacement in applications where gate drive capability is adequate.

IRLZ44STRRPBF (Vishay Siliconix)

Identical electrical specifications to IRLZ44SPBF with tape and reel packaging format. Provides 4006 pieces in current inventory, supporting high-volume production requirements. Active product status ensures long-term availability. Recommended for production environments requiring automated component handling and reel-based assembly processes.

PSMN015-60BS,118 (Nexperia USA Inc.)

This substitute offers superior on-resistance performance (14.8 mOhm vs. 22 mOhm), reducing conduction losses in high-current applications. Provides 60V Vdss with 50A continuous drain current. Higher gate threshold voltage (4V vs. 2V) requires gate drive circuit adjustment. Significantly lower input capacitance (1220 pF vs. 1700 pF) and gate charge (20.9 nC vs. 48 nC) enable faster switching with reduced gate drive power. Highest inventory availability (12675 pieces) supports immediate procurement. Active product status with ROHS3 compliance and ±20V gate voltage rating provides enhanced gate drive protection margin.

STB55NF06LT4 (STMicroelectronics)

Part of the STripFET™ II series, this device provides 60V Vdss with 55A continuous drain current, exceeding the original 47A specification. On-resistance of 18 mOhm at 27.5A, 10V represents improvement over the IRLZ44NSPBF. Gate threshold voltage of 4.7V requires gate drive circuit verification. Lower gate charge (37 nC vs. 48 nC) and input capacitance (1700 pF matching original) support efficient switching. Active product status with ROHS3 compliance and ±16V gate voltage rating. Cut tape and Digi-Reel® packaging available.

STB55NF06T4 (STMicroelectronics)

Also part of the STripFET™ II series with identical electrical performance to STB55NF06LT4 but rated for 50A continuous drain current. On-resistance of 18 mOhm at 27.5A, 10V. Gate threshold voltage of 4V (lower than LT4 variant) may reduce gate drive circuit adjustment requirements. Higher gate charge (60 nC vs. 48 nC) and lower input capacitance (1300 pF vs. 1700 pF) compared to original. Highest inventory availability among STMicroelectronics options (18852 pieces). Active product status with ROHS3 compliance and ±20V gate voltage rating.

Frequently Asked Questions (FAQ)

Q: Can IRLZ44SPBF directly replace IRLZ44NSPBF without circuit modifications?

A: IRLZ44SPBF is electrically compatible for direct replacement in most applications. Both devices share the same 2V gate threshold voltage and similar input capacitance characteristics. The higher Vdss rating (60V vs. 55V) and increased current capability (50A vs. 47A) provide design margin. However, gate charge increase from 48 nC to 66 nC requires verification that gate drive circuits can supply the additional charge within acceptable timing windows. Input capacitance increase from 1700 pF to 3300 pF may affect switching speed in circuits with marginal gate drive impedance.

Q: What are the key differences between Vishay IRLZ44 variants and STMicroelectronics STB55NF06 devices?

A: Vishay IRLZ44SPBF and IRLZ44STRRPBF maintain lower gate threshold voltage (2V) compared to STMicroelectronics STB55NF06 series (4V to 4.7V). This difference requires gate drive circuit adjustment when substituting between manufacturers. STB55NF06 devices offer lower on-resistance (18 mOhm vs. 28 mOhm for IRLZ44SPBF) and reduced gate charge, enabling more efficient switching. STB55NF06LT4 provides higher current rating (55A vs. 50A). Both manufacturers' devices are ROHS3 compliant with identical operating temperature ranges and D2PAK packaging.

Q: How does PSMN015-60BS,118 differ from other substitutes in gate drive requirements?

A: PSMN015-60BS,118 features the lowest on-resistance (14.8 mOhm) and gate charge (20.9 nC) among all substitutes, enabling superior efficiency and fastest switching speed. However, gate threshold voltage of 4V (vs. 2V for IRLZ44NSPBF) requires gate drive circuits capable of delivering 10V or higher gate voltage. Input capacitance of 1220 pF is significantly lower than the original 1700 pF, reducing gate drive power requirements. The ±20V gate voltage rating provides maximum protection margin for gate drive transients. Recommended for applications where gate drive capability is adequate and efficiency optimization is prioritized.

Q: Are all substitute parts available in the same packaging formats as IRLZ44NSPBF?

A: All substitute parts use D2PAK (TO-263-3) surface mount packaging, maintaining mechanical compatibility. However, packaging formats differ: IRLZ44SPBF is supplied in tube format, IRLZ44STRRPBF in tape and reel, PSMN015-60BS,118 in tape and reel, and STB55NF06 variants in cut tape with Digi-Reel® option. Tape and reel formats support automated assembly processes, while tube and cut tape formats accommodate manual or semi-automated handling. Verify packaging format compatibility with assembly equipment before procurement.

Q: Which substitute offers the best inventory availability for immediate production needs?

A: PSMN015-60BS,118 provides the highest inventory level at 12,675 pieces, followed by STB55NF06T4 at 18,852 pieces. Both devices support immediate procurement for production requirements. IRLZ44STRRPBF offers 4,006 pieces in tape and reel format suitable for automated assembly. IRLZ44SPBF provides 1,448 pieces in tube format. STB55NF06LT4 has 1,311 pieces available. Inventory levels should be verified with suppliers for current availability, as stock quantities fluctuate based on demand and manufacturing schedules.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity level rating, matching the original IRLZ44NSPBF specifications. All devices are classified under ECCN EAR99 and HTSUS 8541.29.0095 for export and tariff purposes. REACH status is unaffected for Nexperia and STMicroelectronics devices. Vishay devices do not specify REACH status in provided documentation. All parts operate across the -55°C to 175°C temperature range required for industrial applications.

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