KA79L05AD Equivalent & Substitute Parts

Part Overview

The KA79L05AD is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative -5V output at 100mA. This negative fixed output regulator operates across an input voltage range up to -30V and includes integrated over-temperature and short-circuit protection. The device is packaged in an 8-SOIC surface-mount configuration with unlimited moisture sensitivity rating.

The KA79L05AD is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring this negative voltage regulation function.

Substiute Parts

KA79L05AD

onsemiIn Stock: 2197KA79L05AD Datasheet

Current PartRFQ

MC79L05ABDR2G

onsemiIn Stock: 3772MC79L05ABDR2G Datasheet

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MC79L05ACDR2G

onsemiIn Stock: 3780MC79L05ACDR2G Datasheet

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L79L05ABD13TR

STMicroelectronicsIn Stock: 16597L79L05ABD13TR Datasheet

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L79L05ACD13TR

STMicroelectronicsIn Stock: 78520L79L05ACD13TR Datasheet

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LM79L05ACM/NOPB

Texas InstrumentsIn Stock: 1268LM79L05ACM/NOPB Datasheet

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LM79L05ACMX/NOPB

Texas InstrumentsIn Stock: 16294LM79L05ACMX/NOPB Datasheet

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MC79L05ACD

onsemiIn Stock: 3630MC79L05ACD Datasheet

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MC79L05ACDE4

Texas InstrumentsIn Stock: 1139MC79L05ACDE4 Datasheet

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MC79L05ACDR

Texas InstrumentsIn Stock: 5000147MC79L05ACDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA79L05AD is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Output voltage: -5V fixed
• Output current capability: 100mA minimum
• Input voltage rating: -30V or greater
• Package type: 8-SOIC form factor
• Mounting type: Surface mount
• Protection features: Over-temperature and short-circuit protection

Substitute parts must maintain identical output voltage and current specifications, compatible package geometry, and equivalent protection mechanisms. Variations in quiescent current, PSRR, dropout voltage, and operating temperature ranges are permitted provided the substitute meets or exceeds the minimum electrical requirements of the original design.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status):

MC79L05ABDR2G and MC79L05ACDR2G from onsemi provide direct functional equivalence with active product status and ROHS3 compliance. MC79L05ABDR2G supports extended operating temperature range (-40°C to 125°C) and is available in Tape & Reel packaging. MC79L05ACDR2G maintains the original 0°C to 125°C operating range and is available in Cut Tape & Digi-Reel packaging. Both devices maintain -30V maximum input voltage rating and 100mA output current specification.

L79L05ABD13TR and L79L05ACD13TR from STMicroelectronics are active alternatives with ROHS3 compliance and identical electrical specifications. L79L05ABD13TR supports -40°C to 125°C operating range, while L79L05ACD13TR maintains 0°C to 125°C range. Both offer high inventory availability and are available in Cut Tape & Digi-Reel packaging.

LM79L05ACM/NOPB and LM79L05ACMX/NOPB from Texas Instruments are active alternatives with ROHS3 compliance. These devices support -35V maximum input voltage (exceeding the -30V requirement) and are suitable for applications requiring extended input voltage tolerance. Operating temperature range is limited to 0°C to 70°C. LM79L05ACM/NOPB is packaged in Tube format, while LM79L05ACMX/NOPB is available in Cut Tape & Digi-Reel packaging.

Secondary Substitutes (Last Time Buy Status):

MC79L05ACDE4 and MC79L05ACDR from Texas Instruments are available as Last Time Buy alternatives with ROHS3 compliance. These devices have reduced maximum input voltage rating (-20V) compared to the original specification (-30V) and should be selected only when input voltage does not exceed -20V. Both maintain 100mA output current and 0°C to 125°C operating temperature range.

Obsolete Alternative:

MC79L05ACD from onsemi is classified as obsolete and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can I substitute the KA79L05AD with any of the listed alternatives?

A: Substitution is valid only when the application input voltage does not exceed the substitute part's maximum input voltage rating. For applications requiring -30V input tolerance, select from MC79L05ABDR2G, MC79L05ACDR2G, L79L05ABD13TR, L79L05ACD13TR, LM79L05ACM/NOPB, or LM79L05ACMX/NOPB. For applications with input voltage limited to -20V or less, MC79L05ACDE4 and MC79L05ACDR are also suitable.

Q: What is the difference between the onsemi, STMicroelectronics, and Texas Instruments alternatives?

A: All alternatives provide identical -5V fixed output at 100mA with 8-SOIC packaging. Primary differences are manufacturer, product status, operating temperature range, and maximum input voltage rating. onsemi and STMicroelectronics alternatives support -30V input; Texas Instruments LM79L05 series supports -35V input; Texas Instruments MC79L05ACDE4 and MC79L05ACDR support only -20V input. Operating temperature ranges vary between 0°C to 70°C and -40°C to 125°C depending on part number.

Q: Which substitute offers the best long-term availability?

A: L79L05ACD13TR from STMicroelectronics is recommended for new designs, as it maintains active product status with the highest reported inventory (78,450 units) and ROHS3 compliance. MC79L05ABDR2G and MC79L05ACDR2G from onsemi are also active with substantial inventory levels (3,707 and 3,768 units respectively).

Q: Are there packaging differences between substitutes?

A: Yes. Packaging options include Tape & Reel (MC79L05ABDR2G), Cut Tape & Digi-Reel (MC79L05ACDR2G, L79L05ABD13TR, L79L05ACD13TR, LM79L05ACMX/NOPB), and Tube (LM79L05ACM/NOPB, MC79L05ACDE4). All alternatives use the same 8-SOIC form factor with 0.154" width and 3.90mm body width, ensuring PCB footprint compatibility.

Q: What is the significance of PSRR differences between parts?

A: Power Supply Rejection Ratio (PSRR) at 120Hz indicates the regulator's ability to reject power supply noise. The original KA79L05AD specifies 60dB PSRR, while most active alternatives specify 49dB to 50dB PSRR. This represents a 10dB reduction in noise rejection capability. For applications sensitive to power supply ripple, the KA79L05AD's superior PSRR performance should be considered; however, the 49dB to 50dB PSRR of alternatives remains suitable for most standard negative voltage regulation applications.

Q: Should I avoid Last Time Buy parts?

A: MC79L05ACDE4 and MC79L05ACDR are designated Last Time Buy, indicating limited future availability. These parts are suitable for immediate production needs but should not be selected for long-term or high-volume production. Active alternatives are preferred for new designs and ongoing production.