KA7924TU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7924TU is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative output of -24V at 1A in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement. The KA7924TU serves applications requiring stable negative voltage regulation with integrated over-temperature and short-circuit protection.

Substiute Parts

KA7924TU

onsemiIn Stock: 17347KA7924TU Datasheet

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MC7924BTG

onsemiIn Stock: 735MC7924BTG Datasheet

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MC7924CTG

onsemiIn Stock: 5153MC7924CTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KA7924TU are qualified based on the following critical parameters that must remain constant or compatible:

• Output voltage: -24V fixed
• Output current capability: 1A minimum
• Package type: TO-220-3 (through-hole mounting)
• Output configuration: Negative
• Protection features: Over-temperature and short-circuit protection

The substitute parts MC7924BTG and MC7924CTG meet these core requirements. Both are onsemi negative linear regulators with identical -24V output and 1A current rating in TO-220-3 packages. Variations in input voltage rating, dropout voltage, and operating temperature range are acceptable within the substitution criteria, as these represent design improvements or different temperature grades of the same base product.

Parameter Comparison

Engineering Selection Recommendations

Both MC7924BTG and MC7924CTG are direct substitutes for the KA7924TU based on electrical and mechanical compatibility. Selection between these options depends on specific application requirements:

MC7924CTG is recommended for applications requiring the same operating temperature range as the original KA7924TU (0°C ~ 125°C) and offers ROHS3 compliance certification.

MC7924BTG provides extended low-temperature operation (-40°C ~ 125°C) and improved dropout voltage performance (1.3V versus 2V), making it suitable for applications with more demanding thermal or input voltage margin requirements. This part also includes over-current protection in addition to over-temperature protection.

Both substitute parts are manufactured by onsemi and carry REACH Unaffected and EAR99 ECCN classifications, matching the regulatory profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can MC7924BTG and MC7924CTG be used interchangeably with KA7924TU?

A: Yes, both parts are electrically and mechanically compatible substitutes. The primary difference is operating temperature range: MC7924CTG matches the original 0°C ~ 125°C range, while MC7924BTG extends to -40°C. Selection depends on your application's thermal requirements.

Q: What is the significance of the improved dropout voltage in the substitute parts?

A: The MC7924BTG and MC7924CTG feature 1.3V dropout voltage compared to 2V in the KA7924TU. Lower dropout voltage allows the regulator to maintain output regulation with smaller input-to-output voltage differentials, reducing power dissipation and improving efficiency in applications with tight input voltage margins.

Q: Are the substitute parts pin-compatible with the KA7924TU?

A: Yes. All three parts use the TO-220-3 package with identical pinout, enabling direct board-level replacement without layout modifications.

Q: Do the substitute parts include the same protection features?

A: Both MC7924BTG and MC7924CTG include over-temperature protection matching the KA7924TU. Additionally, they provide over-current protection, which the original part does not specify. This represents an enhancement in circuit protection.

Q: What is the inventory status of these substitute parts?

A: MC7924CTG has 5100 units in stock, and MC7924BTG has 646 units available. Both are classified as obsolete products.

Q: Are there RoHS compliance differences between the parts?

A: The substitute parts MC7924BTG and MC7924CTG are ROHS3 compliant. The original KA7924TU does not specify RoHS status. If RoHS compliance is required for your application, the substitute parts satisfy this requirement.