STFI15N95K5 Equivalent & Substitute Parts

Part Overview

The STFI15N95K5 is an N-Channel MOSFET manufactured by STMicroelectronics, designed for high-voltage applications requiring 950V drain-to-source voltage capability. This device operates as a Through Hole component in the TO-281 (I2PAKFP) package and delivers 7.5A continuous drain current at 25°C with 30W maximum power dissipation. The STFI15N95K5 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

STFI15N95K5

STMicroelectronicsIn Stock: 984STFI15N95K5 Datasheet

Current PartRFQ

STF15N95K5

STMicroelectronicsIn Stock: 25155STF15N95K5 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STFI15N95K5 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Drain to Source Voltage (Vdss): Must equal 950V
• Gate Threshold Voltage (Vgs(th)): Must equal 5V @ 100µA
• Maximum Gate Voltage (Vgs Max): Must equal ±30V
• On-State Resistance (Rds On): Must equal 500mOhm at specified conditions
• Operating Temperature Range: Must span -55°C to 150°C (TJ)

Mechanical Compatibility Criteria:

• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Mounting Type: Through Hole
• Package compatibility based on pin configuration and thermal characteristics

The substitute part STF15N95K5 meets all electrical equivalence criteria and maintains Through Hole mounting compatibility, though with a different package form factor (TO-220FP versus TO-281 I2PAKFP). This substitution is valid where physical board layout and thermal management accommodate the alternative package geometry.

Parameter Comparison

Engineering Selection Recommendations

STF15N95K5 as Primary Substitute:

The STF15N95K5 is the recommended substitute for the obsolete STFI15N95K5 based on the following engineering factors:

1. Electrical Equivalence: All critical electrical parameters match or exceed the original specification. Drain-to-source voltage, gate threshold voltage, maximum gate voltage, and on-state resistance are identical or functionally equivalent.

2. Product Status: The STF15N95K5 maintains Active product status with STMicroelectronics, ensuring long-term availability, continued manufacturing support, and access to current datasheets and technical documentation.

3. Compliance and Certifications: The STF15N95K5 is RoHS3 Compliant and maintains REACH Unaffected status, meeting current regulatory requirements for electronic components in industrial and commercial applications.

4. Current Availability: The substitute part demonstrates substantial inventory availability (25,100 pieces in stock), supporting immediate procurement and production continuity.

5. Package Consideration: The TO-220FP package differs from the original TO-281 (I2PAKFP) package. Design integration requires verification of printed circuit board layout, mounting hole spacing, and thermal management provisions to accommodate the alternative package geometry. Both packages are Through Hole configurations and support equivalent thermal performance within the 30W power dissipation specification.

Frequently Asked Questions (FAQ)

Q: Can the STF15N95K5 directly replace the STFI15N95K5 without circuit modifications?

A: Electrical substitution is valid. The STF15N95K5 meets all critical electrical parameters including Vdss, Vgs(th), Rds On, and operating temperature range. However, physical board layout modifications are required due to package form factor differences (TO-220FP versus TO-281 I2PAKFP). Pin configuration and mounting hole spacing differ between these packages.

Q: What are the key electrical parameters that determine substitution validity?

A: Substitution validity is determined by: (1) Drain-to-Source Voltage (Vdss) = 950V, (2) Gate Threshold Voltage (Vgs(th)) = 5V @ 100µA, (3) Maximum Gate Voltage (Vgs Max) = ±30V, (4) On-State Resistance (Rds On) = 500mOhm at specified conditions, and (5) Operating Temperature Range = -55°C to 150°C (TJ).

Q: Does the STF15N95K5 have higher current capability than the original part?

A: Yes. The STF15N95K5 specifies 12A continuous drain current (Tc) compared to 7.5A (Ta) for the STFI15N95K5. This represents a current capability increase and does not compromise substitution validity. The higher current rating provides design margin in applications operating at or below the original 7.5A specification.

Q: Are there thermal management differences between the two packages?

A: Both packages support 30W maximum power dissipation. The TO-220FP package provides different thermal coupling characteristics compared to TO-281 (I2PAKFP). Thermal design verification is required to confirm adequate heat dissipation in the target application, particularly if the original design relied on specific thermal properties of the TO-281 package.

Q: What is the significance of the different Gate Charge specifications?

A: The STF15N95K5 specifies 40nC @ 10V compared to 30nC @ 10V for the STFI15N95K5. This 10nC increase represents approximately 33% higher gate charge. In switching applications, higher gate charge requires proportionally longer switching times or higher gate drive current. Circuit gate drive capability must accommodate this parameter difference.

Q: Is the STF15N95K5 suitable for new designs or only for legacy system support?

A: The STF15N95K5 is suitable for both new designs and legacy system support. Active product status, current manufacturing, RoHS3 compliance, and substantial inventory availability support long-term design implementation and production continuity.

Q: What compliance certifications apply to the substitute part?

A: The STF15N95K5 is RoHS3 Compliant and REACH Unaffected. Both certifications meet current regulatory requirements for electronic components in industrial, commercial, and consumer applications. ECCN classification is EAR99 and HTSUS code is 8541.29.0095.