LM79L15ACM Equivalent & Substitute Parts

Part Overview

The LM79L15ACM is a linear voltage regulator IC from Texas Instruments designed for negative fixed output applications. This negative 15V regulator delivers 100mA output current in an 8-SOIC surface mount package. The main part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and production support beyond the original part's availability window.

Substiute Parts

LM79L15ACM

Texas InstrumentsIn Stock: 7959LM79L15ACM Datasheet

Current PartRFQ

LM79L15ACM/NOPB

Texas InstrumentsIn Stock: 3215LM79L15ACM/NOPB Datasheet

DirectRFQ

L79L15ABD13TR

STMicroelectronicsIn Stock: 1608L79L15ABD13TR Datasheet

MFR RecommendedRFQ

L79L15ACD13TR

STMicroelectronicsIn Stock: 61967L79L15ACD13TR Datasheet

MFR RecommendedRFQ

MC79L15ABDR2G

onsemiIn Stock: 3635MC79L15ABDR2G Datasheet

MFR RecommendedRFQ

MC79L15ACDR2G

onsemiIn Stock: 3122MC79L15ACDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM79L15ACM are qualified based on the following critical parameters that determine functional equivalence:

• Output Configuration & Voltage: Negative output, fixed -15V
• Current Rating: 100mA output current capability
• Package Type: 8-SOIC surface mount package (0.154", 3.90mm Width)
• Input Voltage Range: Maximum -35V input
• Protection Features: Over temperature and short circuit protection
• Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Same Manufacturer - Texas Instruments)

• LM79L15ACM/NOPB: Identical electrical specifications with different packaging (Tube vs. standard). Active product status provides extended availability.

Category 2: Cross-Manufacturer Substitutes (Electrical Equivalence)

• L79L15ACD13TR and L79L15ABD13TR (STMicroelectronics)
• MC79L15ACDR2G and MC79L15ABDR2G (onsemi)

These parts maintain the core electrical specifications (negative -15V output, 100mA, 8-SOIC package) while offering extended operating temperature ranges and active product status for improved supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For Immediate Replacement (Active Product Status Priority): LM79L15ACM/NOPB is the primary substitute. It maintains identical electrical specifications and operating temperature range as the original LM79L15ACM while offering Active product status. The only difference is packaging format (Tube), which does not affect electrical performance or PCB compatibility.

For Extended Temperature Range Applications: L79L15ACD13TR and MC79L15ACDR2G both support 0°C ~ 125°C operating temperature, providing thermal margin beyond the original part's 0°C ~ 70°C specification. Both are Active products with established supply availability.

For Full Temperature Range Coverage: L79L15ABD13TR and MC79L15ABDR2G extend the operating range to -40°C ~ 125°C, suitable for industrial and automotive applications requiring wider temperature performance.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I use LM79L15ACM/NOPB as a direct replacement for LM79L15ACM? A: Yes. Both parts are from Texas Instruments with identical electrical specifications, output voltage (-15V), current rating (100mA), package type (8-SOIC), and operating temperature range (0°C ~ 70°C). The difference is packaging format (Tube vs. standard), which does not affect circuit performance or PCB layout.

Q: What is the difference between the Texas Instruments and STMicroelectronics versions? A: The core electrical specifications are equivalent: -15V output, 100mA current, 8-SOIC package, and -35V maximum input. Key differences are PSRR (50dB vs. 39dB at 120Hz for TI vs. ST) and operating temperature range. STMicroelectronics parts offer extended temperature support (0°C ~ 125°C or -40°C ~ 125°C).

Q: Are onsemi MC79L15 parts pin-compatible with the LM79L15ACM? A: Yes. MC79L15ACDR2G and MC79L15ABDR2G use the same 8-SOIC package with identical pinout. Both deliver -15V output at 100mA and support the same -35V maximum input voltage. They are electrically and mechanically compatible.

Q: Why do some substitutes have lower PSRR (39dB vs. 50dB)? A: PSRR (Power Supply Rejection Ratio) indicates how well the regulator rejects input voltage ripple. The original LM79L15ACM specifies 50dB at 120Hz, while STMicroelectronics and onsemi parts specify 39dB. Both values are within acceptable ranges for typical negative voltage regulation applications. Applications requiring higher PSRR should prioritize the Texas Instruments LM79L15ACM/NOPB.

Q: Can I use a substitute with an extended temperature range in place of the original? A: Yes. Parts rated for wider temperature ranges (such as -40°C ~ 125°C) are backward compatible with applications designed for 0°C ~ 70°C. The extended range provides additional thermal margin without affecting performance within the original specification window.

Q: What is the significance of "Last Time Buy" status for the original LM79L15ACM? A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Designs should transition to Active alternatives such as LM79L15ACM/NOPB or cross-manufacturer equivalents to ensure long-term supply chain continuity.

Q: Are all substitute parts available in the same packaging options? A: The electrical substitutes are available in different packaging formats: LM79L15ACM/NOPB (Tube), L79L15ACD13TR (Cut Tape & Digi-Reel), L79L15ABD13TR (Tape & Reel), MC79L15ACDR2G (Tape & Reel), and MC79L15ABDR2G (Tape & Reel). All use the same 8-SOIC package footprint suitable for surface mount assembly.