IRFR320TRLPBF N-Channel MOSFET 400V 3.1A Equivalent & Substitute Parts

Part Overview

The IRFR320TRLPBF is an N-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Vishay Siliconix, rated for 400V drain-to-source voltage with a continuous drain current of 3.1A at 25°C. This device is packaged in a Surface Mount DPAK (TO-252-3) configuration and is designed for general-purpose switching and amplification applications in power electronics circuits.

The IRFR320TRLPBF maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching or exceeding critical electrical parameters including drain-to-source voltage rating, continuous drain current capability, on-state resistance characteristics, and compatible surface mount packaging.

Substiute Parts

IRFR320TRLPBF

Vishay SiliconixIn Stock: 1152IRFR320TRLPBF Datasheet

Current PartRFQ

AOD5N40

Alpha & Omega Semiconductor Inc.In Stock: 32992AOD5N40 Datasheet

MFR RecommendedRFQ

STD5NK40ZT4

STMicroelectronicsIn Stock: 17956STD5NK40ZT4 Datasheet

MFR RecommendedRFQ

STD7NK40ZT4

STMicroelectronicsIn Stock: 35107STD7NK40ZT4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IRFR320TRLPBF are qualified based on the following critical parameters that determine functional equivalence and interchangeability:

Voltage Rating Requirement: All substitute parts must maintain a Drain to Source Voltage (Vdss) rating of 400V or greater to ensure safe operation in circuits designed for the IRFR320TRLPBF.

Current Capability: Substitute parts must support a continuous drain current (Id) at 25°C equal to or exceeding 3.1A to handle the same load conditions without thermal derating.

On-State Resistance (Rds On): The maximum on-state resistance at the specified gate-source voltage (10V) must be comparable or lower to maintain similar conduction losses and thermal performance.

Gate Charge (Qg): Gate charge characteristics influence switching speed and driver circuit requirements. Substitute parts with similar or lower gate charge values ensure compatible gate drive performance.

Package Compatibility: All substitute parts are qualified in TO-252-3 DPAK surface mount packaging, ensuring mechanical and thermal interface compatibility with the original design.

Compliance and Status: All substitute parts maintain Active product status and RoHS3 compliance, meeting the same regulatory and environmental standards as the IRFR320TRLPBF.

The three qualified substitute parts—AOD5N40, STD5NK40ZT4, and STD7NK40ZT4—meet these criteria with variations in current rating and power dissipation capacity, allowing selection based on specific application thermal and current requirements.

Parameter Comparison

Engineering Selection Recommendations

AOD5N40 (Alpha & Omega Semiconductor Inc.): This substitute provides enhanced current handling capability at 4.2A continuous drain current, exceeding the IRFR320TRLPBF specification by 35%. The AOD5N40 delivers superior power dissipation capacity at 78W and lower gate charge at 8.5nC, resulting in reduced switching losses. The on-state resistance of 1.6Ohm at 1A is favorable for low-loss applications. This part is suitable for applications requiring higher current margins or improved thermal performance. The AOD5N40 maintains RoHS3 compliance and Active product status. Operating temperature range extends to -50°C minimum, which is 5°C higher than the main part.

STD5NK40ZT4 (STMicroelectronics SuperMESH™ Series): This substitute provides near-equivalent performance with 3A continuous drain current, matching the IRFR320TRLPBF within 3% margin. The STD5NK40ZT4 maintains identical on-state resistance at 1.8Ohm and offers comparable power dissipation at 45W. Gate charge is 17nC, slightly lower than the main part. This device is optimized for direct replacement in existing designs with minimal performance variation. The SuperMESH™ technology provides enhanced switching characteristics. Full operating temperature range of -55 to 150°C matches the main part specification. RoHS3 compliance and Active status are maintained.

STD7NK40ZT4 (STMicroelectronics SuperMESH™ Series): This substitute offers the highest current capability at 5.4A continuous drain current, providing 74% margin above the IRFR320TRLPBF specification. The STD7NK40ZT4 delivers the lowest on-state resistance at 1Ohm and highest power dissipation capacity at 70W, making it suitable for high-current or thermally demanding applications. Gate charge is 26nC, higher than the main part, which may require gate driver adjustment. This part is selected when maximum current headroom and thermal performance are required. RoHS3 compliance, Active status, and full operating temperature range are maintained.

All three substitute parts are qualified for direct mechanical and electrical substitution in TO-252-3 DPAK surface mount applications. Selection among these options depends on specific application current requirements, thermal constraints, and gate drive circuit capabilities.

Frequently Asked Questions (FAQ)

Q: Can the AOD5N40 be used as a direct replacement for the IRFR320TRLPBF?

A: The AOD5N40 is electrically compatible as a substitute. Both devices share the same 400V Vdss rating, TO-252 DPAK package, and RoHS3 compliance. The AOD5N40 provides higher current capability (4.2A vs. 3.1A) and lower gate charge (8.5nC vs. 20nC), making it suitable for direct substitution in most applications. The minimum operating temperature is -50°C compared to -55°C for the IRFR320TRLPBF.

Q: What is the difference between STD5NK40ZT4 and STD7NK40ZT4?

A: Both devices are STMicroelectronics SuperMESH™ series MOSFETs with 400V Vdss rating and TO-252-3 DPAK packaging. The primary differences are: STD5NK40ZT4 provides 3A continuous drain current with 1.8Ohm Rds On and 45W power dissipation; STD7NK40ZT4 provides 5.4A continuous drain current with 1Ohm Rds On and 70W power dissipation. The STD7NK40ZT4 is selected for higher current applications or when lower on-state losses are required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The IRFR320TRLPBF and all three substitute parts (AOD5N40, STD5NK40ZT4, STD7NK40ZT4) are RoHS3 compliant with Moisture Sensitivity Level 1 (unlimited). All parts maintain Active product status.

Q: What does gate charge (Qg) mean for substitution?

A: Gate charge represents the total charge required to switch the MOSFET from off to on state. Lower gate charge reduces switching losses and allows faster switching speeds. The IRFR320TRLPBF has 20nC gate charge. The AOD5N40 has 8.5nC (lower, faster switching), STD5NK40ZT4 has 17nC (similar), and STD7NK40ZT4 has 26nC (higher, slower switching). Gate driver circuits must be capable of supplying the required charge within the switching time window.

Q: Can I use STD7NK40ZT4 in place of IRFR320TRLPBF if my circuit only requires 3.1A?

A: Yes. The STD7NK40ZT4 is rated for 5.4A continuous drain current, which exceeds the 3.1A requirement. The device will operate safely at lower current levels. The STD7NK40ZT4 offers superior thermal performance and lower on-state resistance (1Ohm vs. 1.8Ohm), reducing conduction losses. However, the higher gate charge (26nC vs. 20nC) may require gate driver adjustment to maintain equivalent switching speed.

Q: What is the significance of on-state resistance (Rds On)?

A: On-state resistance determines conduction losses when the MOSFET is in the on state. Lower Rds On reduces power dissipation and heat generation. The IRFR320TRLPBF has 1.8Ohm Rds On. Substitutes range from 1Ohm (STD7NK40ZT4) to 1.6Ohm (AOD5N40), all providing equal or superior performance. Lower Rds On is beneficial for high-current or thermally constrained applications.

Q: Are the substitute parts available in the same packaging?

A: All substitute parts are available in TO-252-3 DPAK surface mount packaging, identical to the IRFR320TRLPBF. This ensures mechanical compatibility with existing PCB layouts and thermal interface designs. Packaging differences exist only in supplier delivery format (Tape & Reel vs. Cut Tape), which does not affect component performance or mounting.

Q: What is the operating temperature range for each part?

A: The IRFR320TRLPBF operates from -55°C to 150°C. The AOD5N40 operates from -50°C to 150°C (5°C higher minimum). The STD5NK40ZT4 and STD7NK40ZT4 both operate from -55°C to 150°C, matching the main part specification. All parts maintain full electrical specifications across their respective operating ranges.

Q: Which substitute should I select for a new design?

A: Selection depends on application requirements. For direct replacement with minimal design changes, select STD5NK40ZT4 (near-equivalent 3A rating). For applications requiring higher current margin or improved thermal performance, select AOD5N40 (4.2A) or STD7NK40ZT4 (5.4A). All three parts are Active, RoHS3 compliant, and suitable for production designs.