KA79L05AMTF Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA79L05AMTF is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative output of -5V at 100mA. This Surface Mount device in SOT-89-3 package is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of 0°C to 125°C and includes integrated over-temperature and short-circuit protection features.

Substiute Parts

KA79L05AMTF

onsemiIn Stock: 2252KA79L05AMTF Datasheet

Current PartRFQ

MC79L05ACPRAG

onsemiIn Stock: 6642MC79L05ACPRAG Datasheet

SimilarRFQ

L79L05ACUTR

STMicroelectronicsIn Stock: 56972L79L05ACUTR Datasheet

DirectRFQ

L79L05ABUTR

STMicroelectronicsIn Stock: 35160L79L05ABUTR Datasheet

SimilarRFQ

MC79L05F-TP

Micro Commercial CoIn Stock: 6176MC79L05F-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KA79L05AMTF is determined by strict alignment of the following critical parameters:

• Output Configuration: Negative
• Output Type: Fixed
• Voltage - Output (Min/Fixed): -5V
• Voltage - Input (Max): -30V
• Current - Output: 100mA
• Protection Features: Over Temperature, Short Circuit
• Operating Temperature Range: Minimum 0°C to 125°C

All substitute parts listed maintain these core electrical specifications. Variations in mounting type (Surface Mount vs. Through Hole), package designation (SOT-89-3 vs. TO-92-3), and product status (Active vs. Obsolete) are secondary considerations that do not affect functional equivalence for the specified electrical application.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the KA79L05AMTF, the following selection criteria apply based on product status and compliance:

Primary Recommendation for Surface Mount Applications: L79L05ACUTR (STMicroelectronics) or L79L05ABUTR (STMicroelectronics) are the preferred substitutes. Both maintain identical electrical specifications, Surface Mount configuration, and SOT-89-3 packaging. L79L05ABUTR offers extended operating temperature range (-40°C to 125°C) compared to the original part (0°C to 125°C). Both are Active products with ROHS3 compliance.

Alternative Surface Mount Option: MC79L05F-TP (Micro Commercial Co) provides equivalent electrical performance with superior PSRR specification (71dB vs. 60dB at 120Hz). This part is Active and ROHS3 compliant, supplied in Tape & Reel packaging.

Through Hole Alternative: MC79L05ACPRAG (onsemi) is suitable only for applications where Through Hole mounting is required. This part uses TO-92-3 package configuration and is not recommended for Surface Mount PCB designs.

All substitute parts maintain the critical electrical parameters: -5V fixed negative output, 100mA output current, -30V maximum input voltage, and integrated thermal and short-circuit protection.

Frequently Asked Questions (FAQ)

Q: Can L79L05ACUTR directly replace KA79L05AMTF in a Surface Mount design? A: Yes. Both parts are Surface Mount devices in SOT-89-3 package with identical electrical specifications: -5V fixed output, 100mA current rating, -30V maximum input, and equivalent protection features. Pin configuration and PCB footprint are compatible.

Q: What is the difference between L79L05ACUTR and L79L05ABUTR? A: The primary difference is operating temperature range. L79L05ACUTR operates 0°C to 125°C, while L79L05ABUTR operates -40°C to 125°C. All other electrical parameters are identical. Select L79L05ABUTR for applications requiring extended low-temperature operation.

Q: Why is MC79L05ACPRAG listed as a substitute if it uses Through Hole packaging? A: MC79L05ACPRAG is electrically equivalent but uses TO-92-3 Through Hole package instead of SOT-89-3 Surface Mount. It is suitable only for Through Hole PCB designs or applications where Surface Mount is not required. It cannot be used as a direct PCB replacement for the original Surface Mount part.

Q: Does MC79L05F-TP offer any performance advantage over the original KA79L05AMTF? A: MC79L05F-TP provides superior Power Supply Rejection Ratio (PSRR) of 71dB at 120Hz compared to the original 60dB specification. This results in better noise rejection in the output voltage. All other electrical parameters remain equivalent.

Q: Are all substitute parts RoHS compliant? A: STMicroelectronics (L79L05ACUTR, L79L05ABUTR) and Micro Commercial Co (MC79L05F-TP) parts are ROHS3 compliant. Compliance status for onsemi parts (KA79L05AMTF, MC79L05ACPRAG) is not specified in available documentation.

Q: What is the significance of the Obsolete status for KA79L05AMTF? A: Obsolete status indicates the part is no longer manufactured by onsemi. Existing inventory may be available from distributors, but long-term availability is not guaranteed. Substitution with Active products (L79L05ACUTR, L79L05ABUTR, MC79L05F-TP) is recommended for new designs and ongoing production.

Q: Can these parts be used interchangeably in terms of thermal performance? A: All parts include Over Temperature protection and operate within the same thermal range (0°C to 125°C minimum). Quiescent current specifications are similar (5.5mA to 6mA), indicating comparable thermal characteristics. Specific thermal performance should be evaluated based on application requirements and PCB thermal design.