IPI09N03LA Equivalent & Substitute Parts

Part Overview

The IPI09N03LA is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 25V drain-to-source voltage with 50A continuous drain current at 25°C. This device is housed in a TO-262-3 package and is designed for through-hole mounting applications requiring moderate power dissipation up to 63W. The IPI09N03LA carries an Obsolete product status, making identification of functionally equivalent substitute components essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

IPI09N03LA

Infineon TechnologiesIn Stock: 2434IPI09N03LA Datasheet

Current PartRFQ

STI55NF03L

STMicroelectronicsIn Stock: 2484STI55NF03L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IPI09N03LA is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• FET Type: N-Channel topology
• Drain to Source Voltage (Vdss): Equal to or greater than 25V
• Continuous Drain Current (Id) @ 25°C: Equal to or greater than 50A
• On-State Resistance (Rds On): Comparable or lower values to maintain circuit performance
• Operating Temperature Range: Must encompass -55°C to 175°C
• Mounting Type: Through Hole configuration
• Package Compatibility: TO-262-3 or equivalent I2PAK footprint

The STI55NF03L from STMicroelectronics meets these criteria with a higher voltage rating (30V), increased current capability (55A), and improved thermal performance (80W), while maintaining through-hole mounting and compatible package geometry.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The STI55NF03L is a valid electrical and mechanical substitute for the IPI09N03LA based on the following factors:

1. Voltage and Current Ratings: The STI55NF03L provides higher Vdss (30V vs. 25V) and Id (55A vs. 50A), ensuring operation within safe margins for circuits designed around the original part.

2. Package and Mounting: Both devices use identical through-hole mounting in TO-262-3 / I2PAK packages, permitting direct PCB footprint compatibility without layout modification.

3. Thermal Performance: The STI55NF03L offers superior power dissipation capability (80W vs. 63W), reducing thermal stress in applications operating near the original part's limits.

4. Temperature Range: The STI55NF03L extends the lower operating limit to -60°C, providing broader environmental coverage.

5. Compliance and Availability: Both parts carry REACH Unaffected status and EAR99 classification. Current inventory of 2400 units of the STI55NF03L is available.

Design Considerations:

• On-state resistance (Rds On) of the STI55NF03L is higher at 13 mOhm versus 9.2 mOhm. Circuits sensitive to conduction losses require thermal and power dissipation re-evaluation.
• Gate charge (Qg) is doubled in the STI55NF03L (27 nC vs. 13 nC), necessitating verification that gate drive circuitry can supply adequate current within switching time constraints.
• Maximum gate voltage (Vgs) is reduced from ±20V to ±16V; standard gate drive circuits operating at ±15V or lower are unaffected.

Frequently Asked Questions (FAQ)

Q1: Can the STI55NF03L be used as a direct drop-in replacement for the IPI09N03LA?

A: Yes, from a mechanical and package perspective. Both devices use TO-262-3 through-hole packages with identical pin configurations and footprints. However, electrical parameter differences—particularly on-state resistance and gate charge—require circuit-level validation before deployment.

Q2: What are the key electrical differences between these two MOSFETs?

A: The STI55NF03L offers higher voltage (30V vs. 25V) and current (55A vs. 50A) ratings, but exhibits higher on-state resistance (13 mOhm vs. 9.2 mOhm) and gate charge (27 nC vs. 13 nC). These differences affect power dissipation and gate drive requirements.

Q3: Will the higher gate charge of the STI55NF03L affect my circuit?

A: Gate charge directly impacts switching speed and gate drive current demand. If your gate drive circuit is marginal, the doubled gate charge may slow switching transitions or require increased driver output current. Simulation or bench testing is necessary to confirm compatibility with your specific gate drive implementation.

Q4: Is the higher on-state resistance of the STI55NF03L a concern?

A: The 40% increase in Rds On (9.2 mOhm to 13 mOhm) increases conduction losses proportionally. In high-current applications, this translates to higher junction temperature. Thermal analysis of your specific application is required to ensure the STI55NF03L's superior power dissipation rating (80W vs. 63W) compensates for the higher resistance.

Q5: Are both parts still available for purchase?

A: Both the IPI09N03LA and STI55NF03L are classified as Obsolete. However, current inventory indicates 2419 units of the IPI09N03LA and 2400 units of the STI55NF03L are available from stock. Availability may diminish as existing inventory is depleted.

Q6: What compliance certifications apply to the STI55NF03L?

A: The STI55NF03L carries RoHS3 Compliance status, REACH Unaffected designation, and EAR99 export classification, matching the regulatory profile of the original IPI09N03LA.

Q7: Can I use the STI55NF03L in a circuit designed for 25V operation?

A: Yes. The STI55NF03L's 30V Vdss rating provides a 5V safety margin above the 25V design specification. This margin improves reliability and reduces the risk of voltage transient-induced failure.