LM79L12ACMX Equivalent & Substitute Parts

Part Overview

The LM79L12ACMX is a linear voltage regulator IC from Texas Instruments designed to provide a fixed negative 12V output at 100mA. It is classified as a Power Management (PMIC) component in the 8-SOIC surface mount package. The device is currently marked as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary to support existing designs, maintain legacy systems, and ensure continued availability for production and repair applications.

Substiute Parts

LM79L12ACMX

Texas InstrumentsIn Stock: 7306LM79L12ACMX Datasheet

Current PartRFQ

LM79L12ACMX/NOPB

Texas InstrumentsIn Stock: 2875LM79L12ACMX/NOPB Datasheet

Parametric EquivalentRFQ

L79L12ACD13TR

STMicroelectronicsIn Stock: 10249L79L12ACD13TR Datasheet

MFR RecommendedRFQ

MC79L12ABDR2G

onsemiIn Stock: 5267MC79L12ABDR2G Datasheet

MFR RecommendedRFQ

MC79L12ACDR2G

onsemiIn Stock: 5199MC79L12ACDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM79L12ACMX is determined by the following critical parameters:

• Output Configuration & Voltage: Must be negative output, fixed -12V
• Current Rating: Must support 100mA output current minimum
• Input Voltage Range: Must accept -35V maximum input
• Package: Must be 8-SOIC form factor for PCB compatibility
• Protection Features: Must include over temperature and short circuit protection
• Mounting Type: Must be surface mount

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts that match all electrical specifications and package requirements with identical or superior performance characteristics.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers that meet the same functional and electrical requirements, with potential variations in operating temperature range, PSRR, or quiescent current that remain within acceptable engineering tolerances for this application class.

Parameter Comparison

Engineering Selection Recommendations

LM79L12ACMX/NOPB (Texas Instruments) is the primary substitute for the LM79L12ACMX. It maintains identical electrical specifications and operating temperature range while offering Active product status and ROHS3 compliance. This part is the direct replacement when Texas Instruments sourcing is preferred and operating temperature requirements remain within 0°C to 70°C.

L79L12ACD13TR (STMicroelectronics) provides an alternative from a different manufacturer with extended operating temperature range (0°C ~ 125°C) and ROHS3 compliance. The PSRR is reduced to 42dB, which may be acceptable depending on noise rejection requirements in the application. This part is suitable for designs requiring broader temperature operation.

MC79L12ABDR2G (onsemi) offers the widest operating temperature range (-40°C ~ 125°C) with ROHS3 compliance. The extended low-temperature capability makes this suitable for industrial or automotive applications. PSRR is 42dB (120Hz).

MC79L12ACDR2G (onsemi) provides similar specifications to MC79L12ABDR2G with operating temperature range of 0°C ~ 125°C and ROHS3 compliance. This part is appropriate when the extended low-temperature range of the ABDR2G variant is not required.

All substitute parts maintain the critical functional parameters: negative -12V fixed output, 100mA current capability, -35V maximum input voltage, 8-SOIC package, and integrated over temperature and short circuit protection.

Frequently Asked Questions (FAQ)

Q: Can LM79L12ACMX/NOPB be used as a direct replacement for LM79L12ACMX?

A: Yes. The LM79L12ACMX/NOPB is a direct parametric equivalent with identical electrical specifications and package. The primary difference is product status (Active vs. Not For New Designs) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the onsemi MC79L12ABDR2G and MC79L12ACDR2G?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is operating temperature range: MC79L12ABDR2G operates from -40°C to 125°C, while MC79L12ACDR2G operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Are all substitute parts in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring PCB footprint compatibility with the original LM79L12ACMX.

Q: What does PSRR mean and why does it vary between parts?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject noise from the input supply. The LM79L12ACMX and LM79L12ACMX/NOPB specify 52dB at 120Hz, while the STMicroelectronics and onsemi alternatives specify 42dB. The 10dB difference indicates slightly lower noise rejection in the alternative parts, which may be acceptable depending on your circuit's noise sensitivity.

Q: Are all substitute parts RoHS compliant?

A: The original LM79L12ACMX is RoHS non-compliant. All listed substitute parts (LM79L12ACMX/NOPB, L79L12ACD13TR, MC79L12ABDR2G, and MC79L12ACDR2G) are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: Can I use a substitute part with a wider operating temperature range in a design specified for 0°C ~ 70°C?

A: Yes. A part rated for a wider temperature range (such as 0°C ~ 125°C or -40°C ~ 125°C) can be used in applications requiring only 0°C ~ 70°C operation. The wider rating provides additional design margin and flexibility for future applications.

Q: What is the inventory status of these parts?

A: LM79L12ACMX has 7268 pcs in stock. LM79L12ACMX/NOPB has 2800 pcs. L79L12ACD13TR has 10200 pcs. MC79L12ABDR2G has 5214 pcs. MC79L12ACDR2G has 5174 pcs. Availability may change; verify current stock with your supplier.