KA79M05RTM Equivalent & Substitute Parts

Part Overview

The KA79M05RTM is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative 5V output at 500mA in a DPAK surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates across a 0°C to 125°C temperature range and includes over-temperature and short-circuit protection features.

Substiute Parts

KA79M05RTM

onsemiIn Stock: 2301KA79M05RTM Datasheet

Current PartRFQ

MC79M05CDTRKG

onsemiIn Stock: 4777MC79M05CDTRKG Datasheet

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MC79M05BDTG

onsemiIn Stock: 337414MC79M05BDTG Datasheet

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MC79M05BDTRKG

onsemiIn Stock: 4100MC79M05BDTRKG Datasheet

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UA79M05CKVURG3

Texas InstrumentsIn Stock: 15895UA79M05CKVURG3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the KA79M05RTM is determined by strict equivalence across the following critical parameters: negative output configuration, fixed -5V output voltage, 500mA current output capability, identical DPAK package, and compatible operating temperature range. All substitute parts must maintain the same electrical output specifications and physical form factor to ensure direct PCB compatibility without design modification.

The substitute parts are grouped into two categories:

Direct Equivalents (onsemi MC79M05 Series): MC79M05CDTRKG, MC79M05BDTG, and MC79M05BDTRKG are functionally equivalent onsemi parts with identical electrical specifications. These parts differ only in packaging format (Cut Tape & Digi-Reel or Tube) and product status (Active vs. Obsolete).

Cross-Manufacturer Equivalent (Texas Instruments UA79M05CKVURG3): This Texas Instruments part provides equivalent functionality with minor parameter variations in input voltage maximum (-25V vs. -35V) and dropout voltage specification point (350mA vs. 500mA), but maintains the same output voltage, current rating, and package form factor.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, the onsemi MC79M05 series (MC79M05CDTRKG, MC79M05BDTG, MC79M05BDTRKG) are the primary substitutes. All three variants are currently in Active product status with ROHS3 compliance and improved PSRR specifications (66dB vs. 60dB). Selection between these three should be based on packaging requirements: MC79M05CDTRKG and MC79M05BDTRKG are supplied in Cut Tape & Digi-Reel format suitable for automated assembly, while MC79M05BDTG is supplied in Tube format. The MC79M05BDTG and MC79M05BDTRKG variants offer extended operating temperature range (-40°C ~ 125°C) compared to the original KA79M05RTM specification.

The Texas Instruments UA79M05CKVURG3 is a functional equivalent with identical output specifications and package form factor. However, this part carries Last Time Buy status, indicating limited future availability. The UA79M05CKVURG3 specifies a lower maximum input voltage (-25V vs. -35V) and dropout voltage measurement at 350mA rather than 500mA, which may affect suitability in applications requiring the full -35V input range.

Frequently Asked Questions (FAQ)

Q: Can MC79M05BDTG be used as a direct replacement for KA79M05RTM on existing PCBs?

A: Yes. Both parts use identical TO-252-3 DPAK packaging with the same pinout and electrical output specifications (-5V, 500mA). No PCB modifications are required. The MC79M05BDTG is an Active product with improved specifications and extended temperature range.

Q: What is the difference between MC79M05CDTRKG and MC79M05BDTRKG?

A: Both parts are electrically identical with the same output voltage, current rating, and DPAK package. The primary difference is operating temperature range: MC79M05CDTRKG operates 0°C ~ 125°C, while MC79M05BDTRKG operates -40°C ~ 125°C. Selection depends on application temperature requirements.

Q: Why does UA79M05CKVURG3 specify -25V maximum input versus -35V for the onsemi parts?

A: The UA79M05CKVURG3 is rated for -25V maximum input, which is a more restrictive specification than the KA79M05RTM and onsemi MC79M05 series at -35V. Applications requiring input voltages between -25V and -35V must use onsemi parts to maintain specification compliance.

Q: Is the UA79M05CKVURG3 suitable for new production designs?

A: The UA79M05CKVURG3 carries Last Time Buy status, indicating limited future availability. For new production designs, onsemi MC79M05 series parts (Active status) are recommended to ensure long-term supply continuity.

Q: What does ROHS3 Compliant mean for these parts?

A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials. All substitute parts listed are ROHS3 Compliant, ensuring environmental and regulatory compliance for modern applications.