KA7915TU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7915TU is a negative fixed linear voltage regulator manufactured by onsemi, rated for -15V output at 1A maximum current in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The KA7915TU provides regulated negative voltage output with integrated over-temperature and short-circuit protection, suitable for power management applications requiring negative rail generation.

Substiute Parts

KA7915TU

onsemiIn Stock: 20605KA7915TU Datasheet

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MC7915CTG

onsemiIn Stock: 2431MC7915CTG Datasheet

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MC7915ACTG

onsemiIn Stock: 2103MC7915ACTG Datasheet

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MC7915BTG

onsemiIn Stock: 3138MC7915BTG Datasheet

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MC79M15BTG

onsemiIn Stock: 2237MC79M15BTG Datasheet

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MC79M15CTG

onsemiIn Stock: 8772MC79M15CTG Datasheet

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L7915ACV

STMicroelectronicsIn Stock: 2412L7915ACV Datasheet

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L7915CV

STMicroelectronicsIn Stock: 55335L7915CV Datasheet

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L7915CV-DG

STMicroelectronicsIn Stock: 201958L7915CV-DG Datasheet

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LM320T-15/NOPB

Texas InstrumentsIn Stock: 1597LM320T-15/NOPB Datasheet

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LM7915CT/NOPB

Texas InstrumentsIn Stock: 1982LM7915CT/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the KA7915TU is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Output voltage: -15V fixed
• Output current capability: minimum 1A
• Input voltage rating: -35V maximum
• Package type: TO-220-3 (through-hole mounting)
• Protection features: Over-temperature and short-circuit protection
• Operating temperature range: 0°C ~ 125°C minimum

Substitution Categories:

Direct Equivalents (1A Output Current): Parts meeting all primary criteria with identical 1A output current rating. These include MC7915CTG, MC7915ACTG, MC7915BTG from onsemi, and L7915ACV, L7915CV, L7915CV-DG from STMicroelectronics, and LM320T-15/NOPB, LM7915CT/NOPB from Texas Instruments.

Enhanced Capability Substitutes (1.5A Output Current): Parts with higher output current ratings (1.5A) that exceed the 1A requirement. These provide additional design margin and include L7915ACV, L7915CV, L7915CV-DG, LM320T-15/NOPB, and LM7915CT/NOPB.

Reduced Capability Alternatives (500mA Output Current): Parts with lower output current ratings (500mA) including MC79M15BTG and MC79M15CTG. These are suitable only for applications where the full 1A output is not required.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (1A Equivalent): MC7915CTG, MC7915ACTG, and MC7915BTG from onsemi are active production equivalents with identical electrical specifications and improved voltage dropout performance (1.3V vs 2V). All three are ROHS3 compliant. MC7915BTG extends the operating temperature range to -40°C ~ 125°C, providing additional thermal margin for demanding applications.

For Enhanced Performance (1.5A Capability): L7915CV-DG from STMicroelectronics offers the highest inventory availability (201,850 pcs) with 1.5A output current, lower quiescent current (3 mA), and ROHS3 compliance. LM7915CT/NOPB from Texas Instruments provides the highest PSRR rating (70dB) and lowest quiescent current (1.5 mA) among all substitutes, with 1.5A output capability.

For Current-Limited Applications (500mA): MC79M15CTG and MC79M15BTG are suitable only when application requirements do not exceed 500mA output current. Both maintain -15V output voltage and -35V input rating with ROHS3 compliance.

Compliance Considerations: All active substitute parts are ROHS3 compliant, addressing modern regulatory requirements. The KA7915TU lacks specified RoHS status due to its obsolete classification. All substitutes maintain REACH Unaffected status and identical ECCN/HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can MC7915CTG directly replace KA7915TU in existing designs? A: Yes. MC7915CTG is a direct electrical equivalent with identical -15V output, 1A current rating, and TO-220-3 package. The improved voltage dropout (1.3V vs 2V) provides better performance. No circuit modifications are required.

Q: What is the difference between MC7915CTG, MC7915ACTG, and MC7915BTG? A: All three are onsemi equivalents with identical electrical performance. MC7915BTG extends the operating temperature range to -40°C ~ 125°C, making it suitable for industrial and automotive applications requiring wider temperature operation. MC7915CTG and MC7915ACTG operate from 0°C ~ 125°C.

Q: Can I use L7915CV instead of KA7915TU? A: Yes. L7915CV from STMicroelectronics provides 1.5A output current, exceeding the 1A requirement. It maintains -15V output voltage, TO-220-3 package compatibility, and identical input voltage rating. The higher current capability provides additional design margin without circuit changes.

Q: Are MC79M15BTG and MC79M15CTG suitable replacements? A: These parts are suitable only if your application requires 500mA or less output current. They maintain -15V output voltage and TO-220-3 package compatibility but cannot supply the full 1A rating of the KA7915TU. Use only when current requirements are confirmed below 500mA.

Q: What is the advantage of LM7915CT/NOPB over other substitutes? A: LM7915CT/NOPB from Texas Instruments provides the highest PSRR rating (70dB) and lowest quiescent current (1.5 mA), making it optimal for noise-sensitive applications. It delivers 1.5A output current with identical -15V output and TO-220-3 package.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All active substitute parts listed are ROHS3 compliant. The obsolete KA7915TU does not specify RoHS status. For new designs and production requiring RoHS compliance, any active substitute part is suitable.

Q: Can I mix different substitute parts in the same design? A: Yes, provided all parts meet your application's electrical requirements. All listed substitutes maintain identical -15V output voltage, -35V input rating, and TO-220-3 package. Verify output current requirements before selecting between 1A and 1.5A rated devices.