KA7541 Equivalent & Substitute Parts

Part Overview

The KA7541 is a ballast controller IC manufactured by onsemi, designed for fluorescent lamp ballast applications operating in the 44kHz to 56kHz frequency range. This component is classified as a Power Management PMIC and is packaged in an 8-DIP through-hole configuration. The KA7541 is currently listed as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

KA7541

onsemiIn Stock: 1635KA7541 Datasheet

Current PartRFQ

FAN7711N

onsemiIn Stock: 47644FAN7711N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KA7541 ballast controller is determined by the following critical parameters:

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

Functional Classification: Both components must be ballast controller ICs designed for fluorescent lamp ballast applications.

Operating Temperature Range: The substitute must support the full -25°C to 125°C operating temperature range to maintain thermal performance across all application conditions.

Frequency Range Overlap: While the KA7541 operates at 44kHz ~ 56kHz, substitute parts may operate within adjacent or overlapping frequency ranges suitable for ballast controller applications, provided the frequency bands are compatible with typical fluorescent lamp ballast designs.

Supply Voltage Compatibility: The substitute must operate within a supply voltage range that accommodates the KA7541's 11V ~ 30V specification, ensuring the component functions across the intended power supply envelope.

The FAN7711N meets these substitution criteria through identical package configuration, matching functional classification, compatible operating temperature range, overlapping frequency specification (48.7kHz ~ 57.3kHz), and compatible supply voltage operation (12.4V ~ 15.2V falls within the broader ballast controller supply range).

Parameter Comparison

Engineering Selection Recommendations

Both the KA7541 and FAN7711N are classified as obsolete components. Selection between these parts should be based on the following engineering considerations:

Compliance Status: The FAN7711N carries RoHS3 compliance certification, whereas the KA7541 compliance status is not specified in available documentation. For applications requiring RoHS compliance, the FAN7711N is the preferred selection.

Supply Voltage Operating Range: The KA7541 supports a broader supply voltage range (11V ~ 30V) compared to the FAN7711N (12.4V ~ 15.2V). Applications operating at supply voltages below 12.4V or above 15.2V require the KA7541 or alternative parts with extended voltage specifications.

Frequency Specification: The FAN7711N frequency range (48.7kHz ~ 57.3kHz) overlaps substantially with the KA7541 (44kHz ~ 56kHz). The KA7541 extends to lower frequencies (44kHz), which may be required for specific ballast designs. Verify ballast circuit frequency requirements before substitution.

Supply Current: The FAN7711N draws 3.2 mA compared to the KA7541's 6 mA, representing a 47% reduction in quiescent current consumption. This difference may be significant in power-sensitive applications.

Regulatory Status: Both components are marked as REACH Unaffected and carry EAR99 ECCN classification, indicating equivalent regulatory treatment for export and compliance purposes.

Frequently Asked Questions (FAQ)

Q: Can the FAN7711N directly replace the KA7541 in existing designs?

A: Direct replacement is possible from a package and mounting perspective, as both components use the 8-DIP through-hole package. However, verify that your ballast circuit operates within the FAN7711N's supply voltage range (12.4V ~ 15.2V) and frequency specification (48.7kHz ~ 57.3kHz) before implementation.

Q: What is the primary difference between these two ballast controllers?

A: The main differences are supply voltage range and quiescent current consumption. The KA7541 supports 11V ~ 30V operation, while the FAN7711N is limited to 12.4V ~ 15.2V. The FAN7711N consumes less supply current (3.2 mA vs. 6 mA).

Q: Are there any compliance advantages to using the FAN7711N?

A: The FAN7711N is certified RoHS3 compliant, which may be required for applications subject to RoHS regulations. The KA7541 compliance status is not documented.

Q: Do these parts support dimming functionality?

A: No. Both the KA7541 and FAN7711N are non-dimming ballast controllers. If dimming capability is required, alternative ballast controller parts must be evaluated.

Q: What packaging considerations apply to these components?

A: Both components are through-hole mounted 8-DIP packages with 0.300" (7.62mm) pin spacing. No PCB layout modifications are required for substitution, provided the circuit design accommodates the electrical parameter differences noted above.

Q: Are both parts suitable for new designs?

A: Both components are classified as obsolete. For new designs, evaluation of current-generation ballast controller alternatives is recommended. These parts are suitable for legacy system maintenance and replacement applications only.