HUFA75309D3 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The HUFA75309D3 is an N-Channel MOSFET manufactured by onsemi, rated for 55V drain-to-source voltage with 19A continuous drain current at 25°C. This device is packaged in a Through Hole I-PAK (TO-251-3) configuration and is part of the UltraFET™ series. The product status is listed as Obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

HUFA75309D3

onsemiIn Stock: 1165HUFA75309D3 Datasheet

Current PartRFQ

FQU17P06TU

onsemiIn Stock: 7859FQU17P06TU Datasheet

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STD12NF06L-1

STMicroelectronicsIn Stock: 17247STD12NF06L-1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HUFA75309D3 is constrained by the following critical parameters:

Channel Type: The main part is N-Channel. Substitute parts must maintain N-Channel configuration to preserve circuit polarity and gate drive requirements.

Voltage Rating (Vdss): The main part is rated 55V. Substitute parts with equal or higher Vdss ratings are acceptable within the same application context.

Current Rating (Id): The main part carries 19A continuous drain current. Substitute parts must support equal or higher current ratings to maintain thermal and electrical performance margins.

On-Resistance (Rds On): The main part specifies 70 mOhm maximum at 19A, 10V gate drive. Substitute parts with equal or lower on-resistance values are acceptable.

Package Type: The main part uses Through Hole I-PAK (TO-251-3). Substitute parts must use identical or mechanically compatible packaging to ensure PCB layout compatibility.

Operating Temperature: The main part operates from -55°C to 175°C. Substitute parts must support this temperature range or a superset thereof.

Based on these criteria, the FQU17P06TU and STD12NF06L-1 are listed as substitutes. However, both substitute parts are P-Channel or have reduced current ratings compared to the main part specification, indicating they serve alternative application contexts rather than direct functional equivalents for all use cases.

Parameter Comparison

Engineering Selection Recommendations

For N-Channel Applications Requiring 19A Continuous Current:

The HUFA75309D3 is the primary specification. No direct N-Channel substitute with equivalent 19A current rating and 55V voltage class is provided in the substitute list. The STD12NF06L-1 is N-Channel but rated for only 12A continuous current, making it unsuitable for applications requiring the full 19A specification.

For N-Channel Applications Tolerating 12A Continuous Current:

The STD12NF06L-1 (STMicroelectronics, STripFET™ II series) is an active product with N-Channel configuration, 60V Vdss rating, and 12A continuous current capability. This part maintains the Through Hole I-PAK package format and supports the full -55°C to 175°C operating temperature range. The STD12NF06L-1 carries RoHS3 compliance and REACH Unaffected status, providing regulatory alignment for new designs.

For P-Channel Applications:

The FQU17P06TU (onsemi, QFET® series) is a P-Channel alternative with 60V Vdss and 12A continuous current. This part is suitable only for circuits requiring P-Channel polarity and can tolerate the reduced current rating. The FQU17P06TU operates to 150°C maximum junction temperature, which is 25°C lower than the main part specification.

Product Status Considerations:

The HUFA75309D3 and FQU17P06TU are both listed as Obsolete. The STD12NF06L-1 maintains Active product status, indicating ongoing manufacturer support and availability. For new designs or long-term production continuity, the STD12NF06L-1 is the preferred selection among the provided substitutes.

Frequently Asked Questions (FAQ)

Q: Can the FQU17P06TU directly replace the HUFA75309D3?

A: No. The FQU17P06TU is P-Channel while the HUFA75309D3 is N-Channel. Channel type determines gate drive polarity and circuit topology compatibility. P-Channel and N-Channel devices are not interchangeable without circuit redesign.

Q: Can the STD12NF06L-1 replace the HUFA75309D3 in all applications?

A: The STD12NF06L-1 is suitable only for applications tolerating 12A continuous drain current. The HUFA75309D3 is rated for 19A. Applications requiring the full 19A specification cannot use the STD12NF06L-1 without thermal and electrical performance degradation.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts use the Through Hole I-PAK package (TO-251-3 Short Leads, TO-251AA). Physical pin spacing and mounting hole positions are identical, allowing direct PCB footprint compatibility.

Q: What is the impact of the STD12NF06L-1 operating temperature maximum of 175°C versus the FQU17P06TU maximum of 150°C?

A: The STD12NF06L-1 supports the full -55°C to 175°C range specified for the HUFA75309D3. The FQU17P06TU is limited to 150°C maximum junction temperature, restricting its use in high-temperature applications.

Q: Why is the STD12NF06L-1 preferred over the HUFA75309D3 for new designs?

A: The STD12NF06L-1 carries Active product status, ensuring ongoing manufacturer support, availability, and supply chain continuity. The HUFA75309D3 is Obsolete, indicating discontinued production and potential future unavailability.

Q: How do the on-resistance specifications compare?

A: The HUFA75309D3 specifies 70 mOhm at 19A, 10V gate drive. The STD12NF06L-1 specifies 100 mOhm at 6A, 10V gate drive. Direct comparison is limited by different measurement currents; however, the STD12NF06L-1 exhibits higher on-resistance at lower current levels, affecting power dissipation in high-current applications.

Q: Are there compliance or regulatory differences between the substitute parts?

A: The STD12NF06L-1 carries RoHS3 compliance certification. The HUFA75309D3 and FQU17P06TU do not list RoHS status in the provided specifications. All three parts are REACH Unaffected and carry EAR99 ECCN classification.