FL6961MY PFC Controller Equivalent & Substitute Parts

Part Overview

The FL6961MY is a Power Factor Correction (PFC) controller IC manufactured by onsemi, designed for Boundary Conduction (BCM) mode operation in power management applications. This device operates in the 8-SOIC surface mount package and is rated for supply voltages between 10.5V and 24.5V with a startup current of 10 µA.

The FL6961MY is classified as obsolete. Identifying suitable substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this controller.

Substiute Parts

FL6961MY

onsemiIn Stock: 3662FL6961MY Datasheet

Current PartRFQ

NCL2801CDADR2G

onsemiIn Stock: 3335NCL2801CDADR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FL6961MY is evaluated based on the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility without layout modifications.

Electrical Specifications: Startup current (10 µA) and operating temperature range (-40°C ~ 125°C) must be matched or exceeded. Supply voltage range must encompass or exceed the original specification (10.5V ~ 24.5V minimum).

Functional Mode: The substitute must support PFC control operation. While the FL6961MY operates in Boundary Conduction (BCM) mode, substitutes operating in Critical Conduction (CRM) or Discontinuous Conduction (DCM) modes are functionally compatible for PFC applications, as these modes represent alternative control strategies within the same functional category.

Compliance & Certification: RoHS3 compliance and REACH unaffected status ensure regulatory alignment with the original component.

Parameter Comparison

Engineering Selection Recommendations

The NCL2801CDADR2G is a direct substitute for the FL6961MY based on the following criteria:

Package Equivalence: Both components use the identical 8-SOIC (0.154", 3.90mm Width) package, enabling direct PCB footprint compatibility without layout redesign.

Electrical Compatibility: The NCL2801CDADR2G meets or exceeds all electrical specifications of the FL6961MY. The supply voltage range (10.5V ~ 27V) encompasses the original specification (10.5V ~ 24.5V). Startup current and operating temperature ranges are identical.

Product Status Advantage: The NCL2801CDADR2G is classified as active, ensuring ongoing availability and supply chain stability compared to the obsolete FL6961MY.

Regulatory Compliance: Both components maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels, ensuring no regulatory or environmental qualification changes are required.

Functional Compatibility: While the NCL2801CDADR2G operates in CRM/DCM modes rather than BCM mode, both control strategies are established PFC methodologies. The functional substitution is valid for PFC controller applications.

Frequently Asked Questions (FAQ)

Q: Can the NCL2801CDADR2G be used as a direct replacement for the FL6961MY without PCB modifications?

A: Yes. Both components use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configurations and footprints. No PCB layout changes are required for package compatibility.

Q: What is the difference between BCM, CRM, and DCM operating modes in PFC controllers?

A: Boundary Conduction (BCM), Critical Conduction (CRM), and Discontinuous Conduction (DCM) are three distinct control strategies for power factor correction. BCM operates at the boundary between continuous and discontinuous conduction. CRM and DCM are alternative modes that achieve similar power factor correction objectives through different switching control algorithms. All three are functionally valid for PFC applications.

Q: Does the NCL2801CDADR2G require different circuit design compared to the FL6961MY?

A: Circuit topology and control loop design may require evaluation based on the specific operating mode (CRM/DCM vs. BCM). Refer to the respective device datasheets for detailed application circuit requirements and control parameter specifications.

Q: Are there any compliance or certification differences between these components?

A: No. Both components maintain identical RoHS3 compliance, REACH unaffected status, and moisture sensitivity levels (MSL 1 - Unlimited). No additional environmental or regulatory qualifications are required.

Q: What is the supply voltage range difference, and does it affect substitution?

A: The NCL2801CDADR2G supports 10.5V ~ 27V, while the FL6961MY supports 10.5V ~ 24.5V. The substitute has a wider upper voltage limit, making it compatible with the original specification and applications requiring operation up to 27V.

Q: Is the NCL2801CDADR2G available in the same packaging format (Tape & Reel)?

A: The NCL2801CDADR2G is supplied in Tape & Reel (TR) packaging, which is standard for high-volume production and automated assembly processes.