FDT461N Equivalent & Substitute Parts

Part Overview

The FDT461N is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with a continuous drain current of 540mA at 25°C. The device is housed in a SOT-223-4 surface mount package and is designed for general-purpose switching applications requiring moderate voltage and current ratings.

The FDT461N carries an Obsolete product status. Locating equivalent or substitute components is necessary to support ongoing production requirements, field repairs, and design continuity where this device was previously specified.

Substiute Parts

FDT461N

onsemiIn Stock: 23765FDT461N Datasheet

Current PartRFQ

BSP122,115

Nexperia USA Inc.In Stock: 3839BSP122,115 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDT461N is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• FET Type: Must be N-Channel MOSFET
• Drain to Source Voltage (Vdss): Substitute must equal or exceed 100V
• Continuous Drain Current (Id): Substitute must support at least 540mA at 25°C
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 2V maximum specification
• Rds On (Max): Must not exceed 2Ohm at rated conditions to maintain switching performance
• Power Dissipation: Must support at least 1.13W thermal load
• Operating Temperature Range: Must span -55°C to 150°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount required
• Package: SOT-223-4 or equivalent footprint (TO-261-4, TO-261AA)

The BSP122,115 from Nexperia USA Inc. meets these substitution criteria with enhanced voltage rating (200V Vdss) and comparable current handling (550mA), while maintaining the same package form factor and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

FDT461N Status Consideration: The FDT461N is classified as Obsolete. This status indicates that onsemi has discontinued production and support for this device. Transition to an active substitute is necessary for new production orders and long-term supply chain stability.

BSP122,115 Selection Basis: The BSP122,115 from Nexperia USA Inc. is classified as Not For New Designs, indicating limited availability but continued support for existing applications. This device provides electrical and mechanical compatibility with the FDT461N while offering enhanced voltage rating (200V vs. 100V Vdss).

Compliance and Certification: Both devices carry identical REACH Unaffected status and EAR99 ECCN classification, ensuring regulatory compliance in equivalent applications. The BSP122,115 is RoHS3 Compliant, meeting current environmental standards. Both devices maintain MSL 1 (Unlimited) moisture sensitivity rating, indicating no special handling requirements.

Application Suitability: The BSP122,115 is suitable for direct substitution in applications where the FDT461N was specified, provided the circuit design accommodates the higher Vdss rating (200V). The slightly elevated Rds On (2.5Ohm vs. 2Ohm) and increased power dissipation capability (1.5W vs. 1.13W) present no functional limitation for equivalent switching applications.

Frequently Asked Questions (FAQ)

Q: Can the BSP122,115 be used as a direct pin-for-pin replacement for the FDT461N?

A: Yes. Both devices use the SOT-223 package with identical pinout configuration (TO-261-4, TO-261AA). The BSP122,115 is mechanically and electrically compatible for direct substitution on existing PCB layouts.

Q: What is the primary difference between the FDT461N and BSP122,115?

A: The BSP122,115 features a higher drain-to-source voltage rating (200V vs. 100V). This enhanced voltage capability provides greater design margin in applications operating below 100V. Continuous drain current ratings are comparable (550mA vs. 540mA), and both devices operate across the same temperature range (-55°C to 150°C).

Q: Are there any thermal or power dissipation concerns when substituting the BSP122,115 for the FDT461N?

A: No. The BSP122,115 has a higher maximum power dissipation rating (1.5W vs. 1.13W), providing additional thermal headroom. Existing thermal management solutions designed for the FDT461N will remain adequate for the BSP122,115.

Q: Does the BSP122,115 require different gate drive voltage compared to the FDT461N?

A: No. Both devices have identical gate threshold voltage specifications (2V maximum @ 250µA and 1mA respectively) and identical maximum gate voltage ratings (±20V). Existing gate drive circuits require no modification.

Q: What is the significance of the "Not For New Designs" status of the BSP122,115?

A: This status indicates that while the BSP122,115 remains available for existing applications and field repairs, Nexperia recommends evaluating alternative devices for new product development. However, for applications requiring substitution of the obsolete FDT461N, the BSP122,115 provides immediate compatibility and continued supply availability.

Q: Are there any compliance or regulatory differences between these devices?

A: No. Both devices carry identical REACH Unaffected status and EAR99 ECCN classification. The BSP122,115 is RoHS3 Compliant, meeting current environmental standards. Both maintain MSL 1 (Unlimited) moisture sensitivity rating, requiring no special handling or storage procedures.

Q: How do the input capacitance values compare between the FDT461N and BSP122,115?

A: The BSP122,115 has a higher input capacitance (Ciss) of 100pF @ 25V compared to the FDT461N at 74pF @ 25V. This difference may affect switching speed in high-frequency applications but presents no limitation for standard switching applications.