FQP9N30 Equivalent & Substitute Parts

Part Overview

The FQP9N30 is an N-Channel MOSFET manufactured by onsemi, rated for 300V drain-to-source voltage and 9A continuous drain current in a Through Hole TO-220-3 package. This device is part of the QFET® series and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing in applications requiring N-Channel MOSFET functionality at 300V ratings.

Substiute Parts

FQP9N30

onsemiIn Stock: 1612FQP9N30 Datasheet

Current PartRFQ

FQP11N40C

onsemiIn Stock: 20567FQP11N40C Datasheet

MFR RecommendedRFQ

STP12NK30Z

STMicroelectronicsIn Stock: 6612STP12NK30Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FQP9N30 are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Drain to Source Voltage (Vdss): 300V or higher
• Current - Continuous Drain (Id) @ 25°C: 9A or higher
• Mounting Type: Through Hole
• Package / Case: TO-220-3 or compatible TO-220 variant
• Operating Temperature Range: -55°C ~ 150°C or equivalent
• Vgs (Max): ±30V or higher

Substitute Classification:

MFR Recommended Substitute - FQP11N40C (onsemi): This part exceeds the primary specifications of the FQP9N30 with higher voltage rating (400V vs 300V) and higher current capability (10.5A vs 9A). It maintains the same gate voltage maximum (±30V), operating temperature range, and TO-220-3 package. The FQP11N40C is active product status, ensuring long-term availability.

Similar Substitute - STP12NK30Z (STMicroelectronics): This part matches the voltage rating (300V) and current rating (9A) of the FQP9N30 while maintaining the same operating temperature range and gate voltage maximum. It uses a TO-220 package variant compatible with TO-220-3 footprints. The STP12NK30Z is active product status and represents a cross-manufacturer alternative.

Parameter Comparison

Engineering Selection Recommendations

FQP11N40C Selection Criteria: The FQP11N40C is the manufacturer-recommended substitute from onsemi. This part is active product status, ensuring availability for current and future production. It provides higher voltage and current ratings than the FQP9N30, offering design margin in applications operating at or near the original 300V specification. The identical gate voltage maximum (±30V) and operating temperature range (-55°C ~ 150°C) ensure direct compatibility with existing gate drive circuits and thermal management designs. ROHS3 compliance and active status support long-term supply chain continuity.

STP12NK30Z Selection Criteria: The STP12NK30Z is an active cross-manufacturer alternative from STMicroelectronics. This part matches the original FQP9N30 voltage (300V) and current (9A) specifications exactly, making it suitable for applications where design margin is not required. The TO-220 package variant is mechanically compatible with TO-220-3 footprints. Active product status and ROHS3 compliance support production continuity. This option is appropriate when voltage and current specifications must remain within the original design envelope.

Both substitute parts maintain compliance with ROHS3 and REACH requirements, supporting regulatory and environmental standards applicable to the original FQP9N30.

Frequently Asked Questions (FAQ)

Q: Can the FQP11N40C directly replace the FQP9N30 in all applications?

A: The FQP11N40C has higher voltage (400V vs 300V) and current (10.5A vs 9A) ratings than the FQP9N30. It is electrically compatible with circuits designed for the FQP9N30 because it meets or exceeds all critical parameters. The TO-220-3 package is identical, allowing direct pin-for-pin substitution. However, applications operating at the maximum voltage or current limits of the original design should be evaluated to confirm adequate design margin with the higher ratings.

Q: What is the difference between the FQP11N40C and STP12NK30Z?

A: The FQP11N40C is manufactured by onsemi and provides higher voltage (400V) and current (10.5A) ratings. The STP12NK30Z is manufactured by STMicroelectronics and matches the original FQP9N30 specifications exactly (300V, 9A). Both are active products in TO-220-3 compatible packages. Selection depends on whether design margin or specification matching is required.

Q: Are the TO-220 and TO-220-3 packages interchangeable?

A: The TO-220 and TO-220-3 packages are mechanically and electrically compatible for through-hole mounting applications. Both packages have three leads with identical pin spacing and can be mounted on the same PCB footprint. The STP12NK30Z uses a TO-220 variant that is compatible with TO-220-3 footprints.

Q: What is the impact of higher gate charge in the substitute parts?

A: The FQP11N40C and STP12NK30Z have higher gate charge (35 nC) compared to the FQP9N30 (22 nC). Gate charge affects the speed of switching transitions and the power required by the gate drive circuit. Applications with high-frequency switching or current-limited gate drive circuits should evaluate whether the higher gate charge affects performance or requires gate drive circuit adjustments.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the FQP11N40C and STP12NK30Z are ROHS3 compliant, matching the compliance status of the original FQP9N30. Both parts are also REACH unaffected, supporting regulatory requirements for electronic components.

Q: Why is the FQP9N30 obsolete?

A: The FQP9N30 is classified as obsolete product status. The FQP11N40C and STP12NK30Z are active products, ensuring continued availability and manufacturing support. For new designs or production continuity, selection of an active substitute part is necessary.