STP10NK50Z N-Channel MOSFET 500V 9A Equivalent & Substitute Parts

Part Overview

The STP10NK50Z is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 500V drain-to-source voltage with 9A continuous drain current at 25°C. This device is packaged in a Through Hole TO-220-3 configuration and is part of the SuperMESH™ series. The STP10NK50Z is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and component procurement. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating the Through Hole TO-220 mounting standard.

Substiute Parts

STP10NK50Z

STMicroelectronicsIn Stock: 860STP10NK50Z Datasheet

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AOT9N50

Alpha & Omega Semiconductor Inc.In Stock: 3863AOT9N50 Datasheet

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IRF840LC

Vishay SiliconixIn Stock: 4527IRF840LC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STP10NK50Z is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Drain to Source Voltage (Vdss): 500V
• Mounting Type: Through Hole
• Package / Case: TO-220-3
• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)

Allowable Parameter Variance:

• Current - Continuous Drain (Id) @ 25°C: Equal to or greater than 9A
• Rds On (Max) @ Id, Vgs: Equal to or lower than 700mOhm (lower values indicate improved performance)
• Power Dissipation (Max): Equal to or greater than 125W (higher values provide thermal margin)
• Gate Charge (Qg): Variance permitted within switching performance requirements
• Input Capacitance (Ciss): Variance permitted within circuit design parameters

Substitute parts must maintain the 500V voltage rating and 9A current specification as baseline requirements. Improvements in on-resistance, power dissipation capability, or gate charge characteristics are acceptable. Parts with reduced current ratings or lower voltage ratings are not suitable substitutes.

Parameter Comparison

Engineering Selection Recommendations

AOT9N50 (Alpha & Omega Semiconductor Inc.)

The AOT9N50 meets all mandatory electrical and mechanical substitution criteria for the STP10NK50Z. Both devices share identical 500V Vdss rating, 9A continuous drain current, and TO-220-3 packaging. The AOT9N50 provides superior power dissipation capability at 192W compared to the STP10NK50Z at 125W, offering enhanced thermal performance. Gate charge is reduced to 28nC, improving switching efficiency. On-resistance is slightly higher at 850mOhm versus 700mOhm, representing a minor performance trade-off. The AOT9N50 maintains ROHS3 compliance and is classified as Not For New Designs, indicating mature product status suitable for replacement applications. This substitute is recommended for direct pin-compatible replacement in existing designs.

IRF840LC (Vishay Siliconix)

The IRF840LC provides functional substitution with the following considerations: it maintains the 500V Vdss rating and TO-220-3 packaging required for mechanical compatibility. However, the continuous drain current is rated at 8A, which is 1A lower than the STP10NK50Z specification of 9A. This reduced current rating may limit suitability in applications requiring the full 9A capacity. On-resistance is 850mOhm, matching the AOT9N50. The IRF840LC is classified as Active product status, ensuring ongoing availability and support. However, RoHS non-compliance status must be evaluated against procurement requirements. This substitute is suitable for applications where the 8A current rating provides adequate margin above actual circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the AOT9N50 be used as a direct replacement for the STP10NK50Z?

A: Yes. The AOT9N50 is a direct pin-compatible substitute. Both devices feature identical 500V Vdss rating, 9A continuous drain current, and TO-220-3 packaging. Electrical performance is equivalent within specified tolerances, with the AOT9N50 offering improved power dissipation capability.

Q: What is the primary limitation of the IRF840LC as a substitute?

A: The IRF840LC has a continuous drain current rating of 8A, compared to the STP10NK50Z specification of 9A. Applications requiring the full 9A capacity must verify that circuit operating conditions remain within the 8A limit of the IRF840LC.

Q: Are there compliance differences between the substitute parts?

A: Yes. The STP10NK50Z and AOT9N50 are both ROHS3 compliant. The IRF840LC is RoHS non-compliant. Procurement specifications requiring RoHS compliance eliminate the IRF840LC as an option.

Q: How do on-resistance values affect device selection?

A: The STP10NK50Z specifies 700mOhm maximum on-resistance at 4.5A and 10V gate drive. Both substitute parts specify 850mOhm, representing approximately 21% higher on-resistance. This results in increased power dissipation during conduction. Applications with tight thermal budgets or high switching frequency must account for this difference.

Q: What is the significance of gate charge differences?

A: Gate charge affects switching speed and driver circuit requirements. The AOT9N50 specifies 28nC compared to 39.2nC for the STP10NK50Z, indicating faster switching transitions. The IRF840LC specifies 39nC, matching the original device. Lower gate charge reduces driver power consumption and enables higher switching frequencies.

Q: Can these devices be used interchangeably in high-frequency switching applications?

A: Interchangeability depends on specific circuit requirements. The AOT9N50 offers lower gate charge (28nC) and input capacitance (1042pF), providing advantages in high-frequency operation. The IRF840LC matches the original gate charge specification (39nC) but has slightly higher input capacitance (1100pF). Circuit simulation or testing is necessary to confirm performance in frequency-sensitive applications.

Q: What is the impact of higher power dissipation ratings?

A: The AOT9N50 is rated for 192W power dissipation compared to 125W for the STP10NK50Z. This higher rating provides thermal margin in applications with sustained conduction losses, allowing operation at higher ambient temperatures or with reduced heatsinking requirements.

Q: Are there packaging or mounting differences between these devices?

A: All three devices use Through Hole mounting in TO-220-3 packages. Physical dimensions and pin configurations are identical, enabling direct mechanical substitution without PCB modifications.

Q: What product status considerations apply to device selection?

A: The STP10NK50Z is Obsolete, necessitating substitution for new procurement. The AOT9N50 is Not For New Designs, indicating mature status but continued availability. The IRF840LC is Active, ensuring long-term availability and manufacturer support. For new designs, the IRF840LC is preferred; for replacement applications, the AOT9N50 or IRF840LC are both suitable depending on compliance requirements.