L79L05ABD Equivalent & Substitute Parts

Part Overview

The L79L05ABD is a linear voltage regulator IC manufactured by STMicroelectronics, designed to provide a fixed negative output of -5V at 100mA. This device is classified as a negative fixed output regulator within the Power Management (PMIC) category and is housed in an 8-SOIC surface mount package.

The L79L05ABD is currently listed as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including output voltage, output current capacity, input voltage range, and thermal protection features.

Substiute Parts

L79L05ABD

STMicroelectronicsIn Stock: 1481L79L05ABD Datasheet

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LM79L05ACM/NOPB

Texas InstrumentsIn Stock: 1268LM79L05ACM/NOPB Datasheet

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LM79L05ACMX/NOPB

Texas InstrumentsIn Stock: 16294LM79L05ACMX/NOPB Datasheet

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MC79L05ABDR2G

onsemiIn Stock: 3772MC79L05ABDR2G Datasheet

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MC79L05ACD

onsemiIn Stock: 3630MC79L05ACD Datasheet

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MC79L05ACDE4

Texas InstrumentsIn Stock: 1139MC79L05ACDE4 Datasheet

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MC79L05ACDR

Texas InstrumentsIn Stock: 5000147MC79L05ACDR Datasheet

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MC79L05ACDR2G

onsemiIn Stock: 3780MC79L05ACDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the L79L05ABD is determined by the following critical parameters:

Primary Substitution Criteria:

• Output voltage: -5V fixed
• Output current capacity: 100mA minimum
• Package type: 8-SOIC surface mount
• Output configuration: Negative
• Protection features: Over temperature and short circuit protection

Secondary Compatibility Factors:

• Input voltage range (must accommodate -30V maximum input)
• Operating temperature range (extended range preferred for industrial applications)
• PSRR performance (49dB or higher at 120Hz)
• RoHS3 compliance
• Quiescent current characteristics

Substitute parts are grouped into two categories based on product status and operational temperature range:

Category A - Active Status Parts: Parts currently in production with extended operating temperature ranges (-40°C to 125°C) and unlimited moisture sensitivity ratings. These provide long-term availability and supply chain stability.

Category B - Obsolete/Last Time Buy Parts: Parts with restricted availability or end-of-life status. These may have limited operating temperature ranges (0°C to 125°C or 0°C to 70°C) and should be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 125°C):

The MC79L05ABDR2G (onsemi) and MC79L05ACDR2G (onsemi) are direct functional equivalents with active product status. Both devices maintain the full operating temperature range of the original L79L05ABD and provide unlimited moisture sensitivity ratings. The MC79L05ACDR2G is available in Cut Tape & Digi-Reel packaging with significantly higher inventory levels (3,768 units), making it the preferred choice for production environments requiring extended temperature operation.

For Standard Temperature Range Applications (0°C to 70°C):

The LM79L05ACM/NOPB and LM79L05ACMX/NOPB (Texas Instruments) are suitable alternatives for applications operating within the 0°C to 70°C range. Both devices are in active production status with unlimited moisture sensitivity ratings. The LM79L05ACMX/NOPB offers superior inventory availability (16,200 units) and is supplied in Cut Tape & Digi-Reel packaging, supporting high-volume production requirements.

Compliance and Certification:

All identified substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original L79L05ABD. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001, ensuring regulatory alignment for international distribution.

Moisture Sensitivity Consideration:

The original L79L05ABD carries an MSL rating of 3 (168 hours). All substitute parts feature MSL rating of 1 (unlimited), providing superior moisture tolerance and reducing handling constraints during storage and assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the LM79L05ACM/NOPB replace the L79L05ABD in all applications?

A: The LM79L05ACM/NOPB is electrically compatible for applications operating within 0°C to 70°C. Applications requiring the full -40°C to 125°C temperature range of the original device require the MC79L05ABDR2G or MC79L05ACDR2G instead.

Q: What is the difference between MC79L05ABDR2G and MC79L05ACDR2G?

A: Both devices are manufactured by onsemi and provide identical electrical performance across all critical parameters. The primary difference is packaging format: MC79L05ABDR2G is supplied in Tape & Reel, while MC79L05ACDR2G is supplied in Cut Tape & Digi-Reel. Selection depends on production volume and assembly line requirements.

Q: Are the Texas Instruments LM79L05 variants suitable for industrial temperature applications?

A: The LM79L05ACM/NOPB and LM79L05ACMX/NOPB operate within 0°C to 70°C, which is narrower than the original L79L05ABD range of -40°C to 125°C. These variants are suitable for commercial and consumer applications but not for extended industrial temperature requirements. For industrial applications, select onsemi MC79L05 variants.

Q: What does the input voltage difference between -30V and -35V mean for substitution?

A: The L79L05ABD accepts input voltages up to -30V maximum. The LM79L05ACM/NOPB and LM79L05ACMX/NOPB accept up to -35V. This difference is not a substitution barrier; the Texas Instruments parts provide extended input voltage capability. Verify your application's actual input voltage requirement does not exceed -30V if using onsemi alternatives.

Q: Is the PSRR difference between 49dB and 50dB significant?

A: The PSRR (Power Supply Rejection Ratio) difference of 1dB between the L79L05ABD (49dB) and LM79L05 variants (50dB) is negligible for most applications. Both values indicate equivalent noise rejection performance at 120Hz. This parameter should not be a primary selection criterion for substitution.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (LM79L05ACM/NOPB), Cut Tape & Digi-Reel (LM79L05ACMX/NOPB and MC79L05ACDR2G), and Tape & Reel (MC79L05ABDR2G). Selection depends on production volume, assembly automation capabilities, and inventory management requirements.

Q: Does the MSL rating difference affect board assembly?

A: The original L79L05ABD carries MSL 3 (168-hour limit), while all substitutes carry MSL 1 (unlimited). MSL 1 provides superior moisture tolerance and eliminates time-sensitive handling constraints. This represents an improvement over the original specification and reduces assembly process complexity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance, consistent with the original L79L05ABD. All parts are also REACH unaffected, ensuring regulatory alignment for global distribution and end-of-life management.