IRLIZ44G N-Channel 60V 30A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLIZ44G is an N-Channel metal oxide semiconductor field-effect transistor (MOSFET) manufactured by Vishay Siliconix, rated for 60V drain-to-source voltage and 30A continuous drain current. The device is housed in a TO-220-3 through-hole package and dissipates up to 48W at the case temperature. This component is currently in active product status with 1814 units in stock.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging or compliance requirements are needed, or when design specifications allow for parametric variations within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	30	A (Tc)
On-State Resistance (Rds On Max) @ 18A, 5V	28	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 250µA	2	V
Gate Charge (Qg Max) @ 5V	66	nC
Power Dissipation (Max)	48	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the IRLIZ44G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a Vdss rating of 60V or greater to ensure safe operation within the same circuit topology.

Current Rating: Substitute parts may have equal or higher continuous drain current ratings. The IRLIZ44G specifies 30A; substitutes with 21A, 23A, 50A, or 55A ratings are acceptable depending on circuit requirements.

On-State Resistance (Rds On): This parameter directly affects power dissipation and thermal performance. Substitutes with lower Rds On values (18–28 mOhm) provide improved efficiency.

Package Type: All listed substitutes use TO-220-3 or TO-220F-3 through-hole packages, maintaining mechanical and thermal interface compatibility.

Operating Temperature Range: All substitutes operate across -55°C to 175°C, matching or exceeding the IRLIZ44G specification.

Gate Threshold Voltage (Vgs(th)): Substitutes range from 2V to 4V, all compatible with standard 5V and 10V gate drive circuits.

Compliance Status: RoHS3 compliance and REACH status are documented for each substitute to support regulatory requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On Max (mOhm)	Vgs(th) Max (V)	Qg Max (nC)	Power Dissipation (W)	Package	Product Status	RoHS Status
IRLIZ44G	Vishay Siliconix	60	30	28 @ 18A, 5V	2 @ 250µA	66 @ 5V	48	TO-220-3	Active	Non-compliant
IRLIZ44GPBF	Vishay Siliconix	60	30	28 @ 18A, 5V	2 @ 250µA	66 @ 5V	48	TO-220-3	Active	ROHS3 Compliant
FDPF320N06L	onsemi	60	21	25 @ 21A, 10V	2.5 @ 250µA	30.2 @ 10V	26	TO-220F-3	Active	ROHS3 Compliant
FDPF55N06	Fairchild Semiconductor	60	55	22 @ 27.5A, 10V	4 @ 250µA	37 @ 10V	48	TO-220F-3	Active	Not specified
STF40NF06	STMicroelectronics	60	23	28 @ 11.5A, 10V	4 @ 250µA	32 @ 10V	30	TO-220FP	Obsolete	ROHS3 Compliant
STP55NF06FP	STMicroelectronics	60	50	18 @ 27.5A, 10V	4 @ 250µA	60 @ 10V	30	TO-220FP	Active	ROHS3 Compliant

Engineering Selection Recommendations

IRLIZ44GPBF (Parametric Equivalent): This part is electrically and mechanically identical to the IRLIZ44G, differing only in packaging format (tube versus bulk) and RoHS3 compliance status. Selection of IRLIZ44GPBF is appropriate when RoHS3 compliance is required or when tube packaging is preferred for automated assembly. Product status is active with 2892 units in stock.

FDPF320N06L (onsemi PowerTrench®): This substitute operates at the same 60V rating with reduced continuous current (21A versus 30A) and lower power dissipation (26W versus 48W). The lower on-state resistance (25 mOhm) and reduced gate charge (30.2 nC) provide improved switching efficiency. This part is suitable for applications where the 30A rating of the IRLIZ44G exceeds circuit requirements. Product status is active with ROHS3 compliance and 18800 units in stock.

FDPF55N06 (Fairchild UniFET™): This substitute provides higher current capability (55A) and lower on-state resistance (22 mOhm) while maintaining the same 60V rating and 48W power dissipation. The higher gate threshold voltage (4V) and increased gate charge (37 nC) require verification of gate drive circuit compatibility. Product status is active with 15586 units in stock.

STF40NF06 (STMicroelectronics STripFET™ II): This substitute operates at 60V with 23A continuous current and 30W power dissipation. The on-state resistance (28 mOhm) matches the IRLIZ44G specification. Product status is obsolete; selection of this part is not recommended for new designs. ROHS3 compliance is confirmed with 8011 units in stock.

STP55NF06FP (STMicroelectronics STripFET™ II): This substitute provides the highest current capability (50A) and lowest on-state resistance (18 mOhm) among listed alternatives, with 60V rating and 30W power dissipation. The higher gate threshold voltage (4V) and increased gate charge (60 nC) require gate drive circuit verification. Product status is active with ROHS3 compliance and 10100 units in stock.

Frequently Asked Questions (FAQ)

Q: Can IRLIZ44GPBF be used as a direct replacement for IRLIZ44G?

A: Yes. IRLIZ44GPBF is electrically and mechanically identical to IRLIZ44G. The primary differences are packaging format (tube) and RoHS3 compliance certification. Both parts share the same base product number (IRLIZ44) and identical electrical specifications.

Q: What is the difference between TO-220-3 and TO-220F-3 packages?

A: Both packages are through-hole mounted with three leads and compatible mechanical footprints. The TO-220F variant includes a mounting flange for improved thermal interface. Electrical performance and pin configuration remain identical.

Q: Can I substitute FDPF320N06L for IRLIZ44G in a 30A application?

A: No. FDPF320N06L is rated for 21A continuous current, which is below the 30A requirement of the IRLIZ44G. Substitution is valid only for applications requiring 21A or less.

Q: Are STF40NF06 and STP55NF06FP suitable for new designs?

A: STF40NF06 is obsolete and not recommended for new designs. STP55NF06FP is active and suitable for new designs. Both parts require verification of gate drive circuit compatibility due to higher gate threshold voltage (4V) compared to IRLIZ44G (2V).

Q: What is the impact of lower on-state resistance in substitute parts?

A: Lower on-state resistance (Rds On) reduces power dissipation during conduction, improving thermal performance and efficiency. Parts such as STP55NF06FP (18 mOhm) and FDPF55N06 (22 mOhm) dissipate less heat than IRLIZ44G (28 mOhm) at equivalent current levels.

Q: Do all substitute parts operate across the same temperature range as IRLIZ44G?

A: All listed substitutes operate from -55°C to 175°C, matching or exceeding the IRLIZ44G specification of -55°C to 175°C (TJ).

Q: Which substitute part has the lowest gate charge?

A: FDPF320N06L has the lowest gate charge at 30.2 nC @ 10V, compared to 66 nC @ 5V for IRLIZ44G. Lower gate charge reduces switching losses and gate drive power requirements.

Q: Are all substitute parts RoHS3 compliant?

A: IRLIZ44GPBF, FDPF320N06L, STF40NF06, and STP55NF06FP are ROHS3 compliant. FDPF55N06 compliance status is not specified in available documentation. IRLIZ44G is RoHS non-compliant.

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