HRFZ44N N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The HRFZ44N is an N-Channel MOSFET manufactured by onsemi, rated for 55V drain-to-source voltage and 49A continuous drain current in a Through Hole TO-220-3 package. This device is part of the UltraFET™ series and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new designs and production runs.

Substiute Parts

HRFZ44N

onsemiIn Stock: 2448HRFZ44N Datasheet

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AOT2618L

Alpha & Omega Semiconductor Inc.In Stock: 4383AOT2618L Datasheet

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IRFZ44NPBF

Infineon TechnologiesIn Stock: 92478IRFZ44NPBF Datasheet

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STP55NF06

STMicroelectronicsIn Stock: 155444STP55NF06 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HRFZ44N is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss) rating must equal or exceed 55V
• Continuous Drain Current (Id) must equal or exceed 49A at 25°C
• On-State Resistance (Rds On) must be compatible with circuit requirements
• Gate Threshold Voltage (Vgs(th)) must fall within acceptable operating range
• Package type must be Through Hole TO-220 configuration
• Operating temperature range must span -55°C to 175°C

The substitute parts listed below meet these criteria while offering active product status and improved availability compared to the obsolete HRFZ44N.

Parameter Comparison

Engineering Selection Recommendations

IRFZ44NPBF (Infineon Technologies)

The IRFZ44NPBF is the closest electrical equivalent to the HRFZ44N, matching the 55V Vdss rating and 49A continuous drain current specification. This device is manufactured by Infineon Technologies under the HEXFET® series and maintains active product status with RoHS3 compliance. The IRFZ44NPBF exhibits superior on-state resistance performance (17.5 mOhm versus 22 mOhm) and lower gate charge (63 nC versus 75 nC), resulting in improved switching efficiency. Inventory availability is substantial at 92,400 pieces. The TO-220AB package is mechanically compatible with TO-220-3 footprints in standard through-hole applications.

STP55NF06 (STMicroelectronics)

The STP55NF06 provides a direct functional substitute with a 60V Vdss rating and 50A continuous drain current, exceeding the HRFZ44N specifications. Manufactured by STMicroelectronics under the STripFET™ II series, this device is active and RoHS3 compliant. The STP55NF06 delivers comparable on-state resistance (18 mOhm) and gate charge (60 nC) with higher power dissipation capability (110W). Inventory availability is the highest among all substitutes at 155,400 pieces. The TO-220 package is mechanically compatible with standard through-hole TO-220-3 applications.

AOT2618L (Alpha & Omega Semiconductor Inc.)

The AOT2618L is suitable for applications where the 49A continuous drain current requirement can be reduced to 23A (Tc). This device is rated for 60V Vdss and is manufactured by Alpha & Omega Semiconductor Inc. with active product status and RoHS3 compliance. The AOT2618L exhibits the lowest gate charge (20 nC) among all substitutes, enabling faster switching characteristics. This part is appropriate only for designs where the reduced current rating does not compromise circuit performance. Inventory availability is 4,300 pieces.

Frequently Asked Questions (FAQ)

Q: Can the IRFZ44NPBF directly replace the HRFZ44N in existing designs?

A: Yes. The IRFZ44NPBF matches the critical electrical parameters of the HRFZ44N: 55V Vdss, 49A continuous drain current, and identical gate threshold voltage. The TO-220AB package is mechanically compatible with TO-220-3 through-hole footprints. Pin configuration and lead spacing are identical.

Q: What is the primary advantage of the STP55NF06 over the HRFZ44N?

A: The STP55NF06 provides higher voltage and current ratings (60V, 50A) with improved on-state resistance (18 mOhm) and lower gate charge (60 nC). These characteristics result in reduced power dissipation and improved switching performance. The device is from an active product line with superior long-term availability.

Q: Is the AOT2618L suitable for all HRFZ44N applications?

A: No. The AOT2618L is limited to 23A continuous drain current, which is significantly lower than the HRFZ44N specification of 49A. This substitute is appropriate only for applications where the current requirement does not exceed 23A at 25°C.

Q: Are all substitute parts RoHS compliant?

A: Yes. The IRFZ44NPBF, STP55NF06, and AOT2618L are all RoHS3 compliant. All devices carry REACH Unaffected status and are classified under ECCN EAR99.

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

A: TO-220-3 and TO-220 refer to the same three-lead through-hole package configuration. The designations are used interchangeably by different manufacturers. All substitute parts are mechanically compatible with standard TO-220-3 footprints.

Q: Which substitute part offers the best switching performance?

A: The IRFZ44NPBF and STP55NF06 both offer superior switching performance compared to the HRFZ44N due to lower gate charge values (63 nC and 60 nC respectively versus 75 nC). The AOT2618L provides the lowest gate charge at 20 nC but is limited to lower current applications.

Q: What is the moisture sensitivity level for these devices?

A: All devices, including the HRFZ44N and all substitutes, carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.