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onsemi MC79L15ABD
- Part No.:
- MC79L15ABD
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC79L15ABD.pdf
- Description:
- IC REG LINEAR -15V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
MC79L15ABD from ON Semiconductor is a 100 mA, −15 V fixed negative voltage regulator in SOIC-8 package, featuring internal thermal shutdown and current limiting. It delivers stable regulation for low-power analog circuits, sensor biasing, and dual-rail op-amp supplies where modest current and high ruggedness are required.
For engineers reviewing the MC79L15ABD datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −15 V output tolerance (±4%), dropout voltage of 1.7 V at 40 mA, input voltage range up to −30 V, and operation across −40°C to +125°C industrial temperature range.
Technical Context
The MC79L15ABD implements a monolithic bipolar linear regulator architecture with built-in short-circuit current limiting and thermal overload protection. Its internal circuitry includes error amplifier, pass transistor, reference, and protection logic - all integrated without requiring external compensation components in standard applications.
It operates as a three-terminal fixed negative regulator with ground-referenced output, requiring only input and output bypass capacitors (0.33 µF and 0.1 µF respectively) for stability under typical load conditions. The device maintains regulation with input-to-output differential ≥1.7 V and supports ripple rejection of 34 dB at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −15 V nominal, −14.4 V to −15.6 V over temperature and load - ensures precise biasing for analog stages requiring tight negative rail control. |
| Output Current | 100 mA maximum - sufficient for low-power op-amps, comparators, and logic interface circuits without external boosting. |
| Input Voltage Range | −17.5 V to −30 V - supports common transformer-derived negative supplies while maintaining regulation margin. |
| Dropout Voltage | 1.7 V at 40 mA - defines minimum headroom needed between input and output to sustain regulation. |
| Ripple Rejection | 34 dB (min) at 120 Hz - attenuates rectified AC ripple on unregulated inputs to preserve signal integrity. |
| Thermal Shutdown | Active at +150°C junction temperature - prevents catastrophic failure during overload or poor heatsinking. |
| Operating Temperature | −40°C to +125°C - qualified for industrial environments including motor controls and instrumentation. |
Pinout & Package
MC79L15ABD uses the SOIC-8 (Case 751) surface-mount package, measuring 4.9 mm × 3.9 mm × 1.5 mm with 1.27 mm lead pitch. Thermal resistance is 180°C/W (junction-to-ambient, min pad), enabling moderate power dissipation without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated −15 V output terminal - connects to load and output capacitor (0.1 µF recommended). |
| 2 | VIN | Negative input supply - accepts unregulated −17.5 V to −30 V; requires 0.33 µF bypass capacitor. |
| 3 | VIN | Second input connection - internally tied to Pin 2; improves current handling and thermal distribution. |
| 4 | NC | No connect - not bonded; must remain floating per datasheet. |
| 5 | GND | Ground reference - common return path for input, output, and internal circuitry; critical for stability. |
| 6 | VIN | Third input connection - internally tied to Pins 2 and 3; enhances thermal performance and current sharing. |
| 7 | VIN | Fourth input connection - internally tied to Pins 2–3–6; reduces effective series resistance at input node. |
| 8 | NC | No connect - not bonded; must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Operates stably with only input (0.33 µF) and output (0.1 µF) capacitors - simplifies layout and reduces BOM count. |
| Internal short-circuit current limiting | Limits output current to safe levels during fault conditions - eliminates need for external foldback or fuse circuits. |
| Internal thermal overload protection | Shuts down regulator above +150°C junction temperature - prevents permanent damage under sustained overload. |
| Pb-free SOIC-8 packaging | RoHS-compliant construction with matte tin lead finish - meets global environmental compliance requirements. |
| Wide operating temperature range | Specified from −40°C to +125°C - supports deployment in automotive engine compartments and industrial enclosures. |
Applications
| Industrial Sensor Signal Conditioning | Dual-Rail Op-Amp Power Supply |
|---|---|
|
Use Scenario: Providing clean, stable negative bias for precision temperature, pressure, or current sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Negative voltage regulator supplying −15 V rail to sensor front-end amplifiers and ADC reference buffers. Use Value: Maintains ±0.4% output accuracy over −40°C to +85°C ambient, ensuring consistent sensor offset and gain calibration. |
Use Scenario: Generating symmetrical ±15 V rails for audio preamplifiers, instrumentation amplifiers, and analog computing circuits. IC Role / Device Role / Timing Role: Paired with MC78L15ACD to deliver matched negative rail with identical load regulation (75 mV max) and thermal behavior. Use Value: Enables rail symmetry within 0.2 V under 40 mA load, minimizing op-amp input offset drift and distortion. |
| Legacy Industrial Control Backplanes | Low-Power Analog Data Acquisition |
|
Use Scenario: Regulating legacy −15 V bus on DIN-rail mounted controllers using transformer-based power supplies. IC Role / Device Role / Timing Role: On-board negative regulator replacing discrete Zener/resistor solutions with higher efficiency and lower heat generation. Use Value: Reduces power loss by 40% vs. Zener diode solution at 20 mA load, lowering board temperature rise by 12°C. |
Use Scenario: Powering 12-bit SAR ADCs and low-noise instrumentation amplifiers in portable test equipment. IC Role / Device Role / Timing Role: Low-noise (90 µV RMS) negative supply source for analog signal chain reference and bias networks. Use Value: Limits output noise contribution to <0.05 LSB of full-scale error in 12-bit systems operating at 10 kSPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC79L15ACDR2G | Same SOIC-8 package and −15 V output, but rated for 0°C to +125°C (vs. −40°C to +125°C for MC79L15ABD). | Suitable for commercial/industrial environments without extended cold startup requirements. | Select when ambient operating temperature never falls below 0°C; offers identical electrical specs otherwise. |
| LM7915CDT/NOPB | Pin-compatible SOIC-8 −15 V regulator with 1.5 V dropout (vs. 1.7 V), 40 dB ripple rejection (vs. 34 dB), and −40°C to +125°C rating. | Better ripple suppression and slightly lower dropout enable tighter regulation in noisy or low-headroom designs. | Choose when higher PSRR or reduced dropout is critical; verify thermal performance with LM7915's 200°C/W RJA. |
Compared with MC79L15ACDR2G, the MC79L15ABD extends cold-temperature operation to −40°C - essential for outdoor or automotive-adjacent systems. Versus LM7915CDT/NOPB, it trades 6 dB lower ripple rejection for proven robustness in high-transient industrial settings per ON Semiconductor's qualification testing.
Availability
MC79L15ABD is available at Aetrix Electronics and suitable for industrial sensor interfaces, dual-rail analog signal chains, and legacy control backplane designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC79L15ABD 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 supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC79L00A Series was designed specifically for cost-sensitive, space-constrained industrial and instrumentation applications requiring reliable fixed negative voltage regulation without external components.
FAQ
What is the maximum input voltage for MC79L15ABD?
The MC79L15ABD supports a maximum input voltage of −30 V DC under normal operating conditions (TA = +25°C). At −40°C to +125°C junction temperature, the absolute maximum rated input is −30 V for −15 V output variants, as specified in the Maximum Ratings table. Exceeding this may cause permanent damage.
Does MC79L15ABD require external capacitors?
Yes, the MC79L15ABD requires a 0.33 µF input bypass capacitor and a 0.1 µF output capacitor for stable operation. These values are specified in the Applications Information section and validated across temperature and load conditions. Omitting them risks oscillation or poor transient response.
Is MC79L15ABD pin-compatible with LM7915 variants?
No, MC79L15ABD is not pin-compatible with standard LM7915 packages. While both are −15 V regulators, MC79L15ABD uses an 8-pin SOIC configuration with multiple tied input pins (Pins 2, 3, 6, 7) and two NC pins (Pins 4, 8), whereas LM7915CDT uses a standard 3-pin TO-220 or 3-pin SOIC layout. PCB redesign is required for substitution.
What is the output voltage tolerance of MC79L15ABD over temperature?
The MC79L15ABD guarantees an output voltage of −14.4 V to −15.6 V (±4%) across its full operating junction temperature range of −40°C to +125°C, as confirmed in the Electrical Characteristics table for MC79L15AB devices. This includes line, load, and temperature effects combined.
Can MC79L15ABD be used in automotive applications?
The MC79L15ABD is qualified for industrial temperature range (−40°C to +125°C) and includes automotive-grade test enhancements per ON Semiconductor's documentation. However, it is not AEC-Q100 qualified. For production automotive ECUs, use the explicitly automotive-qualified MC79L15ABDT2G variant instead.
MC79L15ABD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.7V @ 40mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 39dB (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
MC79L15ABD FAQ
1.How can I place an order for MC79L15ABD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79L15ABD 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 MC79L15ABD reliable?
The price and inventory of MC79L15ABD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79L15ABD is usually 5 days.
3.What payment methods are accepted for MC79L15ABD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79L15ABD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79L15ABD?
MC79L15ABD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79L15ABD 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 MC79L15ABD?
For technical support, including MC79L15ABD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79L15ABD requirements.
6.How does Aetrix verify that MC79L15ABD is sourced from the original manufacturer or authorized distributors?
All MC79L15ABD 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 MC79L15ABD meets industry standards.
7.What is the process for return or replacement of MC79L15ABD?
All MC79L15ABD units undergo pre-shipment inspection (PSI). If there is an issue with MC79L15ABD, 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 MC79L15ABD part is unused and in its original packaging.
Return procedure for MC79L15ABD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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