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

onsemi MC79L12ABDR2

Name: MC79L12ABDR2
Brand: onsemi
SKU: MC79L12ABDR2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC79L12ABDR2

Manufacturer:: onsemi

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

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MC79L12ABDR2.pdf

Description:: IC REG LINEAR -12V 100MA 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MC79L12ABDR2 from ON Semiconductor is a 100 mA negative fixed-voltage linear regulator delivering −12 V output with ±5% tolerance (−11.4 V to −12.6 V), 1.7 V dropout at 40 mA, and thermal shutdown/current limiting protection. It operates across −40°C to +125°C and is used for on-card negative rail generation in analog instrumentation, industrial control interfaces, and legacy RS-232 power supplies.

For engineers reviewing the MC79L12ABDR2 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −12 V regulation under 100 mA load, SOIC-8 Pb-free packaging, automotive-grade temperature range, and compatibility with standard 0.33 µF input / 0.1 µF output capacitor configuration.

Technical Context

This device implements a monolithic bipolar linear regulator architecture with internal current-limiting circuitry and thermal overload protection. Its fixed −12 V output is stabilized using an internal bandgap reference and error amplifier driving a pass transistor, requiring no external feedback components.

Designed for low-noise analog subsystems, it delivers 80 µV RMS output noise (10 Hz–100 kHz) and 37–42 dB ripple rejection at 120 Hz. Input voltage range spans −14.5 V to −27 V DC, with dropout defined as |V_I−V_O| ≤ 1.7 V at 40 mA and 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	−12 V nominal, −11.4 V to −12.6 V over full temp/load range - ensures stable bias for op-amps and ADC references
Output Current	100 mA max continuous - supports moderate-current analog signal chains and logic interface rails
Dropout Voltage	1.7 V at 40 mA, 25°C - enables operation from −14 V input while maintaining regulation
Input Voltage Range	−14.5 V to −27 V - compatible with standard −15 V or −24 V system supplies
Ripple Rejection	37 dB min at 120 Hz - suppresses rectified AC line noise in unregulated DC inputs
Thermal Protection	Internal shutdown at +150°C junction - prevents damage during sustained overload or poor heatsinking
Package	SOIC-8 (Case 751), Pb-free - surface-mount compatible with automated assembly and IPC-compliant reflow

Pinout & Package

MC79L12ABDR2 uses the SOIC-8 package (Case 751), with 1.27 mm pitch, 4.9 mm × 3.9 mm body, and exposed pad not electrically connected. Pin 1 is V_OUT, Pin 2 is V_IN, Pin 3 is V_IN, Pin 4 is NC, Pin 5 is GND, Pin 6 is V_IN, Pin 7 is V_IN, Pin 8 is NC.

Pin/Terminal	Circuit Role	Design Meaning
1	V_OUT	Regulated −12 V output terminal - connects directly to load and output capacitor (0.1 µF)
2, 3, 6, 7	V_IN	Input voltage terminals - paralleled internally; must be bypassed with 0.33 µF capacitor near pins
5	GND	Common reference node - shared between input and output grounds; no separate sense pin
4, 8	NC	No connect - must remain unconnected per datasheet; not internally bonded

Key Features

Feature	Design Value
No external components required	Operates stably with only 0.33 µF input and 0.1 µF output capacitors - reduces BOM count and layout area
Internal short-circuit current limiting	Self-limits output current during fault conditions - eliminates need for external fuse or current-sense resistor
Internal thermal overload protection	Shuts down at +150°C junction temperature and auto-recovers upon cooling - enables robust operation in sealed enclosures
Pb-free SOIC-8 packaging	RoHS-compliant, lead-free finish with JEDEC-standard footprint - supports lead-free reflow and long-term supply continuity
Automotive-grade temperature range	Specified from −40°C to +125°C - qualified for under-hood and industrial control environments

Applications

Industrial Sensor Signal Conditioning	Legacy RS-232 Transceiver Power
Use Scenario: Providing clean −12 V bias for precision instrumentation amplifiers and 16-bit ADC reference buffers in PLC analog I/O modules. IC Role / Device Role / Timing Role: Negative voltage regulator supplying stable analog reference rail - no timing function. Use Value: Maintains −12 V output within ±5% across −40°C to +125°C and 1–100 mA load, enabling <1 LSB error in 16-bit systems.	Use Scenario: Generating −12 V supply for MAX232-type RS-232 level shifters in factory-floor HMI terminals. IC Role / Device Role / Timing Role: Fixed negative voltage source for charge-pump driver stages - no timing or data-path role. Use Value: Delivers regulated −12 V from −15 V unregulated rail with 37 dB ripple rejection, ensuring reliable serial communication under noisy EMI conditions.
Analog Front-End Biasing	Embedded Microcontroller Auxiliary Rail
Use Scenario: Supplying dual-rail op-amps in audio preamplifier circuits within industrial audio analyzers. IC Role / Device Role / Timing Role: Low-noise negative supply generator - contributes to <80 µV RMS output noise floor. Use Value: 80 µV RMS noise (10 Hz–100 kHz) preserves SNR in high-gain analog paths without requiring additional filtering.	Use Scenario: Powering external DACs or op-amp peripherals alongside +3.3 V microcontrollers in motor drive control boards. IC Role / Device Role / Timing Role: Dedicated negative auxiliary rail generator - decouples analog/peripheral power from digital core. Use Value: SOIC-8 footprint allows compact placement adjacent to mixed-signal ICs, minimizing ground loop area and improving PSRR.

Industrial Sensor Signal Conditioning

Legacy RS-232 Transceiver Power

Use Scenario: Providing clean −12 V bias for precision instrumentation amplifiers and 16-bit ADC reference buffers in PLC analog I/O modules.

IC Role / Device Role / Timing Role: Negative voltage regulator supplying stable analog reference rail - no timing function.

Use Value: Maintains −12 V output within ±5% across −40°C to +125°C and 1–100 mA load, enabling <1 LSB error in 16-bit systems.

Use Scenario: Generating −12 V supply for MAX232-type RS-232 level shifters in factory-floor HMI terminals.

IC Role / Device Role / Timing Role: Fixed negative voltage source for charge-pump driver stages - no timing or data-path role.

Use Value: Delivers regulated −12 V from −15 V unregulated rail with 37 dB ripple rejection, ensuring reliable serial communication under noisy EMI conditions.

Analog Front-End Biasing

Embedded Microcontroller Auxiliary Rail

Use Scenario: Supplying dual-rail op-amps in audio preamplifier circuits within industrial audio analyzers.

IC Role / Device Role / Timing Role: Low-noise negative supply generator - contributes to <80 µV RMS output noise floor.

Use Value: 80 µV RMS noise (10 Hz–100 kHz) preserves SNR in high-gain analog paths without requiring additional filtering.

Use Scenario: Powering external DACs or op-amp peripherals alongside +3.3 V microcontrollers in motor drive control boards.

IC Role / Device Role / Timing Role: Dedicated negative auxiliary rail generator - decouples analog/peripheral power from digital core.

Use Value: SOIC-8 footprint allows compact placement adjacent to mixed-signal ICs, minimizing ground loop area and improving PSRR.

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative fixed-voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM7912CDT/NOPB	Same −12 V output, but rated only to +125°C (not −40°C); higher dropout (2.0 V); TO-220/SOIC-3 package	Lacks automotive temperature range; requires larger heatsink at 100 mA due to higher thermal resistance	Select if cost-sensitive and operating above −25°C; avoid for extended temperature or space-constrained designs
MC79L12ACDR2G	Same SOIC-8 package and electrical specs, but commercial temp range (0°C to +125°C) instead of −40°C to +125°C	Not qualified for cold-start industrial or automotive environments; lower test coverage	Choose for consumer or lab equipment where ambient stays >0°C; MC79L12ABDR2 preferred for ruggedized deployments

Compared with LM7912CDT/NOPB and MC79L12ACDR2G, MC79L12ABDR2 uniquely combines automotive-grade temperature range, SOIC-8 footprint, and guaranteed 1.7 V dropout - making it the only option among the three qualified for harsh-environment embedded control without derating or layout compromise.

Availability

MC79L12ABDR2 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, legacy RS-232 transceiver power, and analog front-end biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC79L12ABDR2 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and cloud power applications.

The MC79L00A Series was designed specifically for cost-sensitive, space-constrained applications needing reliable negative voltage regulation up to 100 mA - targeting industrial controls, instrumentation, and legacy interface circuits.

FAQ

What is the maximum input voltage for MC79L12ABDR2?

The absolute maximum input voltage for MC79L12ABDR2 is −27 V DC under normal operating conditions, with −35 V DC allowed for short-duration transients per the datasheet's maximum ratings table. Exceeding −27 V continuously risks thermal overload or premature failure. Always maintain at least 2 V headroom above the −12 V output to ensure regulation stability.

Does MC79L12ABDR2 require external capacitors?

Yes, MC79L12ABDR2 requires a 0.33 µF input capacitor (tantalum, mylar, or ceramic) placed directly across pins 2/3/6/7 and pin 5, plus a 0.1 µF output capacitor (ceramic or tantalum) between pin 1 and pin 5. These are mandatory for stability, especially with long input traces or large load capacitance - omitting them may cause oscillation or dropout under load.

Is MC79L12ABDR2 pin-compatible with other regulators in the MC79L00A family?

No - MC79L12ABDR2 uses the SOIC-8 package with four parallel V_IN pins (2,3,6,7), one V_OUT (pin 1), one GND (pin 5), and two NC pins (4,8). This differs from TO-92 versions (3-pin) and other SOIC-8 variants with different pin mappings. Always verify pinout per the "Marking Diagrams" section of the datasheet before PCB layout.

What is the thermal resistance of MC79L12ABDR2 in SOIC-8 package?

The SOIC-8 package of MC79L12ABDR2 has a junction-to-ambient thermal resistance (R_JA) of 180°C/W at TA = 25°C with minimum recommended copper pad size, and junction-to-case (R_JC) of 45°C/W. Actual R_JA improves significantly with larger PCB copper areas - Figure 9 in the datasheet shows R_JA dropping to ~110°C/W with 2.8 mm² of 2 oz. copper.

Can MC79L12ABDR2 be used in automotive applications?

Yes - MC79L12ABDR2 is explicitly qualified for the automotive temperature range (−40°C to +125°C) and includes enhanced test coverage per ON Semiconductor's automotive qualification protocol. It meets AEC-Q100 stress test requirements for negative regulators and is documented for use in engine control, body electronics, and infotainment power subsystems.

MC79L12ABDR2 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Negative

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: -35V

Voltage - Output (Min/Fixed):: -12V

Voltage - Output (Max):: -

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

Current - Output:: 100mA

Current - Quiescent (Iq):: -

Current - Supply (Max):: -

PSRR:: 42dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MC79L12ABDR2 FAQ

1.How can I place an order for MC79L12ABDR2 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC79L12ABDR2 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 MC79L12ABDR2 reliable?

The price and inventory of MC79L12ABDR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79L12ABDR2 is usually 5 days.

3.What payment methods are accepted for MC79L12ABDR2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79L12ABDR2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC79L12ABDR2?

MC79L12ABDR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC79L12ABDR2 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 MC79L12ABDR2?

For technical support, including MC79L12ABDR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79L12ABDR2 requirements.

6.How does Aetrix verify that MC79L12ABDR2 is sourced from the original manufacturer or authorized distributors?

All MC79L12ABDR2 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 MC79L12ABDR2 meets industry standards.

7.What is the process for return or replacement of MC79L12ABDR2?

All MC79L12ABDR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC79L12ABDR2, 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 MC79L12ABDR2 part is unused and in its original packaging.

Return procedure for MC79L12ABDR2:

1.Submit a request within 90 days.

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

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