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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi MC79L05ACPRA

Name: MC79L05ACPRA
Brand: onsemi
SKU: MC79L05ACPRA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC79L05ACPRA

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: MC79L05ACPRA.pdf

Description:: IC REG LINEAR -5V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,187

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Product details

Overview

MC79L05ACPRA from ON Semiconductor is a three-terminal, fixed-output −5.0 V negative voltage regulator delivering up to 100 mA output current with internal thermal shutdown and short-circuit current limiting. It operates with a dropout voltage of 1.7 V at 40 mA and maintains ±2% output voltage accuracy (−4.8 V to −5.2 V) over temperature and load. It is used for on-card regulation in analog signal chains, sensor biasing, and legacy industrial control systems requiring stable negative rail generation.

For engineers reviewing the MC79L05ACPRA datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −5.0 V output tolerance, TO-92 package thermal performance (R_JA = 160°C/W), input voltage range (−30 V max), ripple rejection (41–49 dB), and compatibility with minimal external components (0.33 µF input / 0.1 µF output capacitors).

Technical Context

The MC79L05ACPRA implements a monolithic bipolar linear regulator architecture with built-in current-limiting and thermal-foldback protection. Its internal circuitry includes error amplifier, pass transistor, reference, and protection comparators - all integrated into a single TO-92 die.

It requires no external compensation under standard conditions but specifies input bypass capacitance (≥0.33 µF) for stability with long trace lengths or high-output-capacitance loads. Output noise is 40 µV_RMS (10 Hz–100 kHz), and ripple rejection is specified at 41 dB minimum (120 Hz, −8 V ≤ V_I ≤ −18 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	−5.0 V nominal, −4.8 V to −5.2 V over temperature and load - ensures stable bias for op-amps and ADC references.
Max Output Current	100 mA - sufficient for low-power analog circuits, sensor interfaces, and logic-level translation.
Input Voltage Range	−30 V maximum (for −5 V version) - supports wide-input legacy supplies while maintaining safe operation.
Dropout Voltage	1.7 V at 40 mA - defines minimum headroom needed between input and output for regulation.
Ripple Rejection	41 dB min at 120 Hz - suppresses AC line-derived noise on unregulated DC inputs.
Thermal Resistance	Junction-to-ambient = 160°C/W (TO-92) - determines power dissipation limit (625 mW at 25°C ambient).
Load Regulation	30 mV (1–40 mA) - quantifies output voltage shift due to load changes, critical for precision biasing.

Pinout & Package

MC79L05ACPRA uses the TO-92 (Case 29) plastic package with straight leads and Pb-free finish. The package has a 160°C/W junction-to-ambient thermal resistance and is rated for operation from 0°C to +125°C.

Pin	Circuit Role	Design Meaning
1	Ground	Common reference node; must be low-impedance connection to minimize regulation error.
2	Input	Negative input terminal; accepts unregulated −5.0 V to −30 V supply; requires ≥0.33 µF bypass capacitor if remote.
3	Output	Regulated −5.0 V output; connects to load and 0.1 µF stabilization capacitor; no sense lead.

Key Features

Feature	Design Value
No external components required	Operates stably with only input/output capacitors - reduces BOM count and board space in cost-sensitive designs.
Internal short-circuit current limiting	Prevents destructive current flow during output faults - eliminates need for external fuse or current-sense circuitry.
Internal thermal overload protection	Shuts down regulator above +150°C junction temperature - protects device and system during sustained overload or poor heatsinking.
Pb-free TO-92 packaging	Complies with RoHS Directive 2011/65/EU - enables use in environmentally regulated industrial and consumer products.
Low output noise	40 µV_RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog stages like preamplifiers and reference buffers.

Applications

Industrial Sensor Signal Conditioning	Legacy Analog Instrumentation
Use Scenario: Providing stable −5.0 V bias to dual-supply op-amps in temperature/pressure transducer front-ends. IC Role / Device Role / Timing Role: Negative rail generator ensuring symmetrical supply for precision instrumentation amplifiers. Use Value: Maintains ±2% output accuracy across −40°C to +85°C operating range, minimizing offset drift in sensor signal paths.	Use Scenario: Powering vintage analog panel meters and comparator circuits in factory-floor test equipment. IC Role / Device Role / Timing Role: Fixed negative voltage source replacing discrete Zener-resistor networks. Use Value: Eliminates 30% voltage drift vs. Zener solutions and reduces component count by 4 parts per channel.
Audio Preamp Biasing	Microcontroller Peripheral Interface
Use Scenario: Supplying clean −5.0 V to JFET-input audio preamplifier stages in studio-grade mixers. IC Role / Device Role / Timing Role: Low-noise negative supply rail for analog signal path integrity. Use Value: 40 µV_RMS output noise prevents audible hiss; 49 dB ripple rejection suppresses 120 Hz hum coupling.	Use Scenario: Generating −5.0 V for RS-232 level-shifting ICs interfacing with 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Dedicated negative rail generator enabling compliant TIA-232 voltage levels. Use Value: Delivers 100 mA peak current required for driver ICs without dropout or regulation loss during data bursts.

Industrial Sensor Signal Conditioning

Legacy Analog Instrumentation

Use Scenario: Providing stable −5.0 V bias to dual-supply op-amps in temperature/pressure transducer front-ends.

IC Role / Device Role / Timing Role: Negative rail generator ensuring symmetrical supply for precision instrumentation amplifiers.

Use Value: Maintains ±2% output accuracy across −40°C to +85°C operating range, minimizing offset drift in sensor signal paths.

Use Scenario: Powering vintage analog panel meters and comparator circuits in factory-floor test equipment.

IC Role / Device Role / Timing Role: Fixed negative voltage source replacing discrete Zener-resistor networks.

Use Value: Eliminates 30% voltage drift vs. Zener solutions and reduces component count by 4 parts per channel.

Audio Preamp Biasing

Microcontroller Peripheral Interface

Use Scenario: Supplying clean −5.0 V to JFET-input audio preamplifier stages in studio-grade mixers.

IC Role / Device Role / Timing Role: Low-noise negative supply rail for analog signal path integrity.

Use Value: 40 µV_RMS output noise prevents audible hiss; 49 dB ripple rejection suppresses 120 Hz hum coupling.

Use Scenario: Generating −5.0 V for RS-232 level-shifting ICs interfacing with 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Dedicated negative rail generator enabling compliant TIA-232 voltage levels.

Use Value: Delivers 100 mA peak current required for driver ICs without dropout or regulation loss during data bursts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM79L05ACZ	Same −5.0 V output, 100 mA rating, TO-92 package; higher input voltage limit (−35 V); slightly lower ripple rejection (38 dB).	Preferred where wider input range is needed; not qualified for automotive temp range.	Select when higher input voltage margin is required and LM79L05ACZ is already qualified in design.
MC79L05ACPG	Identical electrical specs and TO-92 package; differs only in packaging format (bulk bag vs. tape-and-reel) and marking code.	No functional difference; same thermal and electrical behavior in circuit.	Choose based on assembly method - MC79L05ACPG for manual/hand-soldered prototypes; MC79L05ACPRA for automated SMT lines.

Compared with LM79L05ACZ, MC79L05ACPRA offers better ripple rejection and automotive-grade variants; compared with MC79L05ACPG, it provides identical performance in tape-and-reel format for high-volume pick-and-place manufacturing.

Availability

MC79L05ACPRA is available at Aetrix Electronics and suitable for industrial sensor conditioning, legacy instrumentation, audio preamp biasing, and RS-232 interface circuits requiring stable component supply and long-term obsolescence management.

Supply support for MC79L05ACPRA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (now onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MC79L00A Series was designed to replace discrete Zener-resistor regulators in cost-sensitive, low-current negative rail applications - emphasizing ruggedness, simplicity, and broad temperature operation.

FAQ

What is the maximum input voltage for MC79L05ACPRA?

The MC79L05ACPRA supports a maximum input voltage of −30 VDC under standard operating conditions. This rating applies specifically to the −5 V output variant and ensures safe operation with adequate headroom for line ripple. Exceeding this voltage risks permanent damage due to internal junction breakdown, as confirmed in the Absolute Maximum Ratings table on page 2 of the official datasheet.

Does MC79L05ACPRA require external capacitors to operate?

MC79L05ACPRA does not require external capacitors for basic regulation, but input bypass (≥0.33 µF) and output stabilization (0.1 µF) capacitors are strongly recommended. These capacitors prevent oscillation under dynamic load conditions and improve transient response, as detailed in Figure 3 and Applications Information section on page 5 of the datasheet.

What is the operating temperature range of MC79L05ACPRA?

The MC79L05ACPRA is rated for an operating junction temperature range of 0°C to +125°C, corresponding to the "C" suffix in its part number. This range is validated per the electrical characteristics test conditions on page 2 and supports use in commercial and industrial environments without forced cooling.

How does thermal protection work in MC79L05ACPRA?

MC79L05ACPRA incorporates internal thermal overload protection that disables the output when junction temperature exceeds +150°C. Recovery occurs automatically once temperature falls below the safe threshold. This behavior is inherent to the monolithic bipolar process and requires no external circuitry, as described in the Features and Applications Information sections.

Is MC79L05ACPRA pin-compatible with other TO-92 negative regulators?

MC79L05ACPRA uses the standard TO-92 pinout: Pin 1 = Ground, Pin 2 = Input, Pin 3 = Output. This matches LM79L05 and UA79L05 devices, enabling direct replacement in existing layouts - provided input voltage, thermal, and ripple rejection requirements are met per each device's datasheet.

MC79L05ACPRA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Negative

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: -30V

Voltage - Output (Min/Fixed):: -5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.7V @ 40mA (Typ)

Current - Output:: 100mA

Current - Quiescent (Iq):: -

Current - Supply (Max):: -

PSRR:: 49dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

MC79L05ACPRA FAQ

1.How can I place an order for MC79L05ACPRA through Aetrix?

Please submit a Request for Quotation (RFQ) for MC79L05ACPRA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC79L05ACPRA reliable?

The price and inventory of MC79L05ACPRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79L05ACPRA is usually 5 days.

3.What payment methods are accepted for MC79L05ACPRA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79L05ACPRA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC79L05ACPRA?

MC79L05ACPRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC79L05ACPRA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC79L05ACPRA?

For technical support, including MC79L05ACPRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79L05ACPRA requirements.

6.How does Aetrix verify that MC79L05ACPRA is sourced from the original manufacturer or authorized distributors?

All MC79L05ACPRA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC79L05ACPRA meets industry standards.

7.What is the process for return or replacement of MC79L05ACPRA?

All MC79L05ACPRA units undergo pre-shipment inspection (PSI). If there is an issue with MC79L05ACPRA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC79L05ACPRA part is unused and in its original packaging.

Return procedure for MC79L05ACPRA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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