FAN6961DZ Equivalent & Substitute Parts

Part Overview

The FAN6961DZ is a Power Factor Correction (PFC) controller IC manufactured by onsemi, designed for discontinuous conduction mode (DCM) operation at 60kHz switching frequency. This 8-DIP through-hole component operates across a 14.6V to 24.5V supply voltage range and is rated for -40°C to 125°C operating temperatures.

The FAN6961DZ is classified as obsolete. Locating equivalent or substitute components is necessary for ongoing system support, maintenance, and new production runs where original stock is unavailable or depleted.

Substiute Parts

FAN6961DZ

onsemiIn Stock: 856FAN6961DZ Datasheet

Current PartRFQ

L6561

STMicroelectronicsIn Stock: 16259L6561 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FAN6961DZ is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use 8-DIP (0.300", 7.62mm) through-hole packaging to ensure direct PCB footprint compatibility without layout modifications.

Functional Mode: The substitute must operate in discontinuous conduction mode (DCM) or transition mode to maintain equivalent PFC control characteristics.

Voltage Supply Range: The substitute supply voltage range must encompass or closely align with the 14.6V to 24.5V specification to ensure proper operation within the target application.

Operating Temperature Range: The substitute must support the required temperature extremes, with particular attention to the lower bound (-40°C minimum for the FAN6961DZ).

Mounting Type: Through-hole mounting is required for direct board-level compatibility.

The L6561 from STMicroelectronics meets these substitution criteria through matching package geometry, compatible PFC control mode, and through-hole mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The L6561 serves as a functional substitute for the FAN6961DZ based on package compatibility and PFC control mode alignment. Both components share identical 8-DIP through-hole packaging and operate within discontinuous conduction mode families.

The L6561 carries a "Not For New Designs" status, indicating it remains available but is not recommended for new product development. Both parts maintain REACH Unaffected compliance and unlimited moisture sensitivity ratings.

Design consideration: The L6561 supply voltage range (11V ~ 18V) is narrower than the FAN6961DZ (14.6V ~ 24.5V). Applications requiring operation above 18V supply voltage may require additional circuit evaluation. The L6561 startup current specification (50 µA) exceeds that of the FAN6961DZ (10 µA), which may impact low-power standby performance in certain applications.

The L6561 minimum operating temperature is -25°C, compared to -40°C for the FAN6961DZ. Applications requiring operation below -25°C require verification of L6561 suitability.

Frequently Asked Questions (FAQ)

Q: Can the L6561 be used as a direct replacement for the FAN6961DZ?

A: The L6561 is mechanically and functionally compatible as a substitute. Both components use 8-DIP through-hole packaging and operate in discontinuous conduction mode for PFC applications. However, the narrower supply voltage range and higher startup current of the L6561 require circuit-level evaluation for specific applications.

Q: What are the key differences between these two PFC controllers?

A: The primary differences are supply voltage range (FAN6961DZ: 14.6V–24.5V; L6561: 11V–18V), startup current (FAN6961DZ: 10 µA; L6561: 50 µA), and minimum operating temperature (FAN6961DZ: -40°C; L6561: -25°C). Both share identical package geometry and PFC control mode classification.

Q: Are there any compliance or certification differences?

A: Both components maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity ratings. The FAN6961DZ is obsolete, while the L6561 is classified as "Not For New Designs," indicating different lifecycle stages but equivalent regulatory compliance.

Q: Does the package footprint differ between these components?

A: No. Both the FAN6961DZ and L6561 use 8-DIP (0.300", 7.62mm) through-hole packaging, enabling direct PCB footprint compatibility without layout modifications.

Q: What should be evaluated before substituting the L6561 for the FAN6961DZ?

A: Verify that the application supply voltage remains within the L6561 range (11V–18V). Confirm that the higher startup current (50 µA vs. 10 µA) does not impact system standby power requirements. For applications operating below -25°C, verify L6561 performance specifications.