LM79L15ACMX Equivalent & Substitute Parts

Part Overview

The LM79L15ACMX is a linear voltage regulator IC from Texas Instruments designed to provide a fixed negative output of -15V at 100mA. This Surface Mount device in 8-SOIC packaging is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part delivers regulated negative voltage with integrated over-temperature and short-circuit protection, suitable for applications requiring stable negative rail generation in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM79L15ACMX
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-15V
Voltage - Input (Max)	-35V
Current - Output	100mA
Current - Quiescent (Iq)	6 mA
PSRR	50dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM79L15ACMX is determined by strict equivalence across the following critical parameters:

Output voltage: -15V fixed
Output current capability: 100mA minimum
Package type: 8-SOIC form factor
Negative output configuration
Protection features: Over-temperature and short-circuit protection
Input voltage rating: -35V maximum

Substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): LM79L15ACMX/NOPB from Texas Instruments maintains identical electrical specifications and packaging, with the primary difference being active product status and RoHS3 compliance.

Manufacturer Recommended Alternatives: Parts from STMicroelectronics (L79L15ACD13TR, L79L15ABD13TR) and onsemi (MC79L15ACDR2G, MC79L15ABDR2G) provide functional equivalence with identical output voltage, current rating, and package specifications. These alternatives are all Active products with RoHS3 compliance.

Parameter Comparison

Parameter	LM79L15ACMX	LM79L15ACMX/NOPB	L79L15ACD13TR	L79L15ABD13TR	MC79L15ACDR2G	MC79L15ABDR2G
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	onsemi	onsemi
Output Voltage	-15V	-15V	-15V	-15V	-15V	-15V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	-35V	-35V	-35V	-35V	-35V	-35V
Quiescent Current	6 mA	6 mA	6 mA	6 mA	Not specified	Not specified
PSRR (120Hz)	50dB	50dB	39dB	39dB	39dB	39dB
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement: LM79L15ACMX/NOPB is the primary choice, maintaining Texas Instruments sourcing while transitioning to an Active product with RoHS3 compliance. This part is functionally identical to the obsolete LM79L15ACMX.

For Multi-Source Strategy: L79L15ACD13TR from STMicroelectronics offers the highest inventory availability (61,908 pcs) and extended operating temperature range to 125°C, supporting broader application requirements. L79L15ABD13TR provides the same electrical performance with lower temperature floor (-40°C).

For Extended Temperature Range: MC79L15ABDR2G and MC79L15ACDR2G from onsemi both support -40°C to 125°C operation, suitable for industrial and automotive applications requiring wider temperature margins.

Compliance Consideration: All substitute parts are RoHS3 compliant, addressing regulatory requirements that the original LM79L15ACMX does not meet. All parts maintain REACH Unaffected and EAR99 ECCN status.

Frequently Asked Questions (FAQ)

Q: Can LM79L15ACMX/NOPB be used as a direct drop-in replacement for LM79L15ACMX?

A: Yes. Both parts are from Texas Instruments with identical electrical specifications, output voltage (-15V), current rating (100mA), and 8-SOIC packaging. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

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

A: Both manufacturers provide -15V, 100mA regulators in 8-SOIC packaging with equivalent functionality. STMicroelectronics parts (L79L15ACD13TR, L79L15ABD13TR) differ in operating temperature ranges and PSRR specification (39dB vs. 50dB on the original). onsemi parts (MC79L15ACDR2G, MC79L15ABDR2G) specify dropout voltage (1.7V @ 40mA typical) and support extended temperature operation to -40°C.

Q: Are there any electrical performance differences between these substitutes?

A: PSRR differs between manufacturers: Texas Instruments parts specify 50dB at 120Hz, while STMicroelectronics and onsemi alternatives specify 39dB. Operating temperature ranges vary across manufacturers. All parts maintain the same -15V output, 100mA current capability, and -35V maximum input voltage.

Q: Does packaging differ between these parts?

A: All substitute parts use the same 8-SOIC (0.154", 3.90mm Width) package. Packaging format options vary (Cut Tape & Digi-Reel vs. Tape & Reel), but the physical component footprint and pinout are identical across all listed alternatives.

Q: Which substitute is recommended for new designs?

A: For new designs, select based on sourcing strategy and temperature requirements. LM79L15ACMX/NOPB maintains Texas Instruments continuity. L79L15ACD13TR offers maximum inventory and active status. MC79L15ABDR2G or MC79L15ACDR2G support extended temperature ranges for industrial applications. All are RoHS3 compliant and suitable for production.

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