STF9N65M2 Equivalent & Substitute Parts

Part Overview

The STF9N65M2 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 650V drain-to-source voltage with 5A continuous drain current at 25°C. This device is packaged in a TO-220FP through-hole configuration and is designed for high-voltage switching applications requiring 20W maximum power dissipation. The STF9N65M2 carries an obsolete product status, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

STF9N65M2

STMicroelectronicsIn Stock: 1459STF9N65M2 Datasheet

Current PartRFQ

TK5A65W,S5X

Toshiba Semiconductor and StorageIn Stock: 2373TK5A65W,S5X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STF9N65M2 is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating: The substitute part must maintain the 650V Vdss specification to ensure safe operation in the same circuit topology without risk of overstress.

Current Rating: The substitute must support continuous drain current at or above 5A to handle the same load conditions. The TK5A65W,S5X provides 5.2A, meeting this requirement.

On-State Resistance: The substitute's Rds On must be compatible with thermal and efficiency requirements. Lower Rds On values reduce power dissipation and heat generation.

Gate Charge and Threshold Voltage: These parameters affect switching speed and gate drive circuit compatibility. Substitutes with similar Qg and Vgs(th) values ensure consistent gate drive requirements.

Package and Mounting: Both the main part and substitute must use through-hole TO-220 family packaging to maintain mechanical compatibility with existing PCB layouts and thermal management solutions.

Compliance and Product Status: Active product status and ROHS3 compliance ensure long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The TK5A65W,S5X from Toshiba Semiconductor and Storage is a direct functional substitute for the obsolete STF9N65M2. Both devices share identical voltage ratings (650V Vdss) and comparable current ratings (5A vs. 5.2A), ensuring electrical compatibility in high-voltage switching applications.

The TK5A65W,S5X offers superior performance characteristics: higher continuous drain current (5.2A), lower on-state resistance (1.2Ohm vs. 900mOhm at comparable test conditions), and increased power dissipation capability (30W vs. 20W). These improvements provide enhanced thermal margin and reduced conduction losses in the same circuit topology.

Both parts are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and regulatory compliance. The TK5A65W,S5X maintains active product status, guaranteeing long-term availability and supply chain continuity.

Package compatibility requires attention: the STF9N65M2 uses TO-220FP packaging while the TK5A65W,S5X uses TO-220SIS packaging. Both are through-hole TO-220 family variants with identical pin configurations and mechanical footprints suitable for standard TO-220 PCB layouts and thermal management hardware.

Frequently Asked Questions (FAQ)

Q: Can the TK5A65W,S5X directly replace the STF9N65M2 in existing designs?

A: Yes. Both devices share identical 650V Vdss ratings, comparable 5A+ continuous drain current specifications, and compatible through-hole TO-220 family packaging. The electrical and mechanical parameters align for direct substitution in the same circuit topology.

Q: What are the differences between TO-220FP and TO-220SIS packaging?

A: Both TO-220FP and TO-220SIS are through-hole TO-220 family variants with identical pin configurations and mechanical footprints. They are mechanically interchangeable on standard TO-220 PCB layouts. The primary difference lies in internal construction and thermal characteristics, but both support equivalent thermal management approaches.

Q: Does the higher on-state resistance of the TK5A65W,S5X affect circuit performance?

A: The TK5A65W,S5X exhibits 1.2Ohm on-state resistance compared to the STF9N65M2's 900mOhm. This difference results in slightly higher conduction losses. However, the TK5A65W,S5X's higher power dissipation rating (30W vs. 20W) and improved thermal characteristics offset this difference, making it suitable for the same applications.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the STF9N65M2 and TK5A65W,S5X are ROHS3 compliant and carry MSL Level 1 (Unlimited) ratings. They meet current environmental and regulatory requirements for electronic component procurement.

Q: Why is the STF9N65M2 marked as obsolete?

A: The STF9N65M2 carries an obsolete product status, indicating that STMicroelectronics has discontinued active production and support. The TK5A65W,S5X, with active product status, provides a viable alternative for new designs and ongoing component procurement.

Q: What gate drive voltage is required for both devices?

A: Both devices specify 10V as the drive voltage for maximum on-state resistance performance. The TK5A65W,S5X supports a higher maximum gate voltage (±30V vs. ±25V), providing additional design flexibility in gate drive circuit implementation.