KA7500C Equivalent & Substitute Parts

Part Overview

The KA7500C is a buck regulator positive output step-down DC-DC controller IC manufactured by onsemi in a 16-PDIP package. This device functions as a transistor driver for step-down voltage conversion applications with a single output phase. The KA7500C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and new production requirements where legacy compatibility or performance characteristics are required.

Substiute Parts

KA7500C

onsemiIn Stock: 53617KA7500C Datasheet

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TL494CN

onsemiIn Stock: 139122TL494CN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA7500C is determined by the following critical parameters that must align for functional equivalence:

Primary Substitution Criteria:

• Package / Case: 16-DIP (0.300", 7.62mm) — physical and pin compatibility
• Voltage - Supply (Vcc/Vdd): 7V ~ 40V — input voltage range compatibility
• Output Type: Transistor Driver — functional output stage requirement
• Function: Step-Down — topology requirement for buck converter applications
• Topology: Buck — converter architecture requirement
• Number of Outputs: 1 — single output configuration requirement

The TL494CN meets these primary criteria with identical package, supply voltage range, output type, and single-output configuration. However, the TL494CN extends functionality to include push-pull topology and dual outputs, with a higher maximum duty cycle (48% vs. 45%) and higher fixed switching frequency (200kHz vs. 1kHz ~ 200kHz range). The TL494CN operates at a narrower temperature range (0°C ~ 70°C vs. -25°C ~ 85°C) and is RoHS non-compliant, whereas the KA7500C is RoHS3 compliant.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution in Buck Converter Applications:

The TL494CN is functionally compatible as a substitute for the KA7500C in 16-DIP package applications requiring step-down DC-DC control. Both devices share identical package geometry, supply voltage range, and transistor driver output configuration. Pin-level compatibility and circuit topology alignment enable direct substitution in existing KA7500C designs.

Compliance and Environmental Considerations:

The KA7500C is RoHS3 compliant, while the TL494CN is RoHS non-compliant. Applications subject to RoHS regulatory requirements must account for this compliance difference. Both devices are REACH unaffected and classified under ECCN EAR99.

Temperature Range Limitations:

The KA7500C operates across -25°C ~ 85°C, while the TL494CN is limited to 0°C ~ 70°C. Applications requiring extended low-temperature operation below 0°C or high-temperature operation above 70°C must evaluate the KA7500C's broader temperature specification.

Functional Capability Differences:

The TL494CN provides extended functionality including push-pull topology support and dual output configuration, with higher maximum duty cycle (48% vs. 45%) and fixed switching frequency at 200kHz. Applications utilizing only single-output buck topology will not require these additional capabilities.

Frequently Asked Questions (FAQ)

Q: Can the TL494CN directly replace the KA7500C in existing designs?

A: Yes, for applications limited to single-output buck converter topology. Both devices share the 16-DIP package, 7V ~ 40V supply voltage range, and transistor driver output type. Pin configuration and functional operation are compatible for step-down DC-DC control applications. However, verify compliance requirements and temperature range suitability for your specific application.

Q: What are the key differences between KA7500C and TL494CN?

A: The primary differences are: (1) Temperature range — KA7500C operates -25°C ~ 85°C versus TL494CN at 0°C ~ 70°C; (2) RoHS compliance — KA7500C is RoHS3 compliant while TL494CN is non-compliant; (3) Functionality — TL494CN supports additional push-pull topology and dual outputs, while KA7500C is single-output buck only; (4) Switching frequency — KA7500C offers 1kHz ~ 200kHz range versus TL494CN fixed at 200kHz; (5) Duty cycle — TL494CN maximum 48% versus KA7500C maximum 45%.

Q: Are there package alternatives to 16-DIP for these controllers?

A: The specifications provided address only the 16-DIP (0.300", 7.62mm) package configuration. Alternative package options for equivalent functionality are outside the scope of this substitution analysis.

Q: What compliance certifications apply to these parts?

A: Both KA7500C and TL494CN are REACH unaffected and classified under ECCN EAR99. The KA7500C is RoHS3 compliant with MSL 1 (Unlimited), while the TL494CN is RoHS non-compliant with MSL 1 (Unlimited).

Q: Can the TL494CN be used in applications requiring the full -25°C ~ 85°C temperature range?

A: No. The TL494CN is rated for 0°C ~ 70°C operation only. Applications requiring extended temperature range below 0°C or above 70°C must use the KA7500C or identify alternative controllers with matching temperature specifications.