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onsemi MC78L09ACDG
- Part No.:
- MC78L09ACDG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L09ACDG.pdf
- Description:
- IC REG LINEAR 9V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,946
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Product details
Overview
MC78L09ACDG from onsemi is a 9.0 V, 100 mA fixed-output positive linear voltage regulator in SOIC-8 package, featuring internal short-circuit current limiting, thermal shutdown, and dropout voltage of 1.7 V at 25°C. It operates over 0°C to +125°C junction temperature and requires no external components for basic regulation in low-power embedded power rails.
For engineers reviewing the MC78L09ACDG datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±5% at 25°C), line/load regulation performance, thermal resistance (RJA per PCB copper area), and compatibility with standard SOIC-8 footprints in space-constrained industrial control modules.
Technical Context
The MC78L09ACDG implements a monolithic series-pass transistor regulator architecture with built-in protection circuitry. Its internal design includes a precision voltage reference, error amplifier, and current-limiting transistor - all integrated into a single silicon die without external compensation requirements.
It delivers stable 9.0 V output across input voltages from 11.5 V to 24 V DC, maintaining regulation under load currents up to 100 mA. Ripple rejection reaches 57 dB at 120 Hz, and output noise is specified at 60 µV RMS (10 Hz–100 kHz), making it suitable for analog-signal conditioning and microcontroller supply applications where moderate PSRR suffices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9.0 V ±0.4 V at 25°C - ensures stable logic-level supply for 9 V–rated peripherals |
| Max Output Current | 100 mA - supports low-power MCU cores, sensors, and interface ICs without heatsinking |
| Dropout Voltage | 1.7 V typical at 25°C - enables operation with minimal headroom above 9 V output |
| Line Regulation | 12 mV max (12–24 V input) - maintains tight output stability despite input ripple or variation |
| Load Regulation | 8.0 mV max (1–40 mA load) - minimizes voltage sag during dynamic current draw |
| Ripple Rejection | 57 dB at 120 Hz - suppresses AC mains-derived ripple in offline SMPS-derived supplies |
| Operating Temp Range | 0°C to +125°C junction - validated for commercial/industrial ambient environments |
Pinout & Package
MC78L09ACDG uses an SOIC-8 (Case 751) package with internally modified lead frame: pins 2, 3, 6, and 7 are electrically common to the die attach flag, reducing thermal resistance and improving power dissipation capability when mounted on adequate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 9.0 V supply rail - connects directly to load; bypass capacitor recommended |
| 2 | Ground | Common reference for input/output - tied to PCB ground plane; electrically common with pins 3, 6, 7 |
| 3 | Ground | Secondary ground connection - enhances thermal conduction and reduces ground impedance |
| 4 | Input | Unregulated DC input (≥11.5 V) - must exceed output by ≥1.7 V for regulation |
| 5 | Ground | Third ground terminal - improves thermal path and noise immunity |
| 6 | Ground | Fourth ground terminal - part of internal flag connection for enhanced heat transfer |
| 7 | Ground | Fifth ground terminal - completes multi-point grounding to die attach flag |
| 8 | NC | No connect - not bonded; left floating per design |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 9.0 V output | Eliminates external resistor network; simplifies BOM and layout for dedicated 9 V rails |
| Internal thermal shutdown | Prevents damage during sustained overload or poor heatsinking - auto-recovery on cooldown |
| Internal short-circuit current limit | Clamps output current to safe level (~150 mA typ) - protects both regulator and downstream circuitry |
| No external capacitors required | Enables minimal footprint designs; input bypass (0.33 µF) recommended only for long traces or high-noise sources |
| Pb-free SOIC-8 package | Complies with RoHS; compatible with standard reflow profiles and automated assembly |
Applications
| Industrial Sensor Interface | Legacy RS-232 Transceiver Supply |
|---|---|
Use Scenario: Powering analog-output temperature/humidity sensors in factory automation nodes. IC Role / Device Role / Timing Role: Provides clean, stable 9.0 V bias for sensor excitation and op-amp signal conditioning stages. Use Value: Maintains <±0.4 V output tolerance across 0–125°C, ensuring sensor accuracy without calibration drift from supply variation. | Use Scenario: Generating ±9 V dual-rail supply (with MC79L09AC) for MAX232-class RS-232 drivers. IC Role / Device Role / Timing Role: Supplies positive rail to charge-pump-based transceivers requiring precise 9 V input for reliable level translation. Use Value: Delivers 100 mA peak current with 57 dB ripple rejection - prevents data corruption from switching noise in noisy industrial comms environments. |
| Microcontroller Auxiliary Rail | Low-Power Analog Front-End |
Use Scenario: Powering ADC reference buffers and I/O expander ICs alongside 3.3 V main MCU rail. IC Role / Device Role / Timing Role: Supplies isolated 9.0 V domain for external analog peripherals needing higher drive voltage than core logic. Use Value: Load regulation of ≤8 mV over 1–40 mA ensures consistent analog gain and offset performance across varying peripheral activity. | Use Scenario: Biasing photodiode transimpedance amplifiers and programmable-gain instrumentation amps. IC Role / Device Role / Timing Role: Delivers low-noise 9.0 V supply (60 µV RMS noise) to sensitive analog signal chains. Use Value: Output noise specification enables sub-12-bit effective resolution preservation in precision measurement systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L09ABDG | Wider temp range: −40°C to +125°C vs. 0°C to +125°C; otherwise identical electrical specs and SOIC-8 package | Suitable for automotive or extended-temperature industrial deployments where cold-start operation is required | Select MC78L09ABDG if operating below 0°C ambient is needed; otherwise MC78L09ACDG offers cost-optimized commercial-grade performance |
| LM78L09ACM/NOPB | Same 9 V output, 100 mA rating, and SOIC-8 package; differs in dropout (1.7 V typ), line regulation (25 mV max), and lower ripple rejection (45 dB) | Acceptable for less demanding applications where tighter regulation or higher PSRR is not critical | Choose LM78L09ACM/NOPB only if legacy TI sourcing or cross-supplier qualification is mandated; MC78L09ACDG provides superior regulation and noise performance |
Compared with MC78L09ABDG, the MC78L09ACDG trades extended temperature support for lower cost and same SOIC-8 footprint; versus LM78L09ACM/NOPB, it delivers tighter line/load regulation and 12 dB higher ripple rejection - critical for noise-sensitive analog subsystems.
Availability
MC78L09ACDG is available at Aetrix Electronics and suitable for industrial sensor nodes, RS-232 communication interfaces, microcontroller auxiliary rails, and low-power analog front-ends requiring stable component supply and RoHS-compliant packaging.
Supply support for MC78L09ACDG 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC78L00A Series was designed to deliver cost-effective, robust fixed-voltage regulation for commercial and industrial embedded systems - prioritizing simplicity, reliability, and wide-input-range operation without external components.
FAQ
What is the maximum input voltage for MC78L09ACDG?
The absolute maximum input voltage for MC78L09ACDG is 35 V DC for 12–18 V-rated versions, but per its electrical characteristics table, it is rated for continuous operation up to 24 V input when delivering 40 mA at 25°C. Exceeding 24 V risks exceeding thermal limits or violating safe operating area - always verify power dissipation using RJA and ambient conditions in your layout.
Does MC78L09ACDG require input and output capacitors?
MC78L09ACDG does not require external capacitors for basic stability, but a 0.33 µF input bypass capacitor is recommended when connected via long traces to the power source, and a 0.1 µF output capacitor improves transient response. These values are validated in the datasheet's Figure 2 and Applications Information section.
Is MC78L09ACDG pin-compatible with other SOIC-8 regulators like LM78L09?
Yes, MC78L09ACDG uses standard SOIC-8 pinout (pin 1 = VOUT, pin 4 = VIN, pins 2/3/5/6/7 = GND, pin 8 = NC), matching LM78L09ACM/NOPB and other industry-standard 78Lxx SOIC-8 variants. However, note that internal ground pin configuration (multiple GND pins tied to die flag) differs from some competitors - verify thermal pad connectivity in layout.
What is the thermal resistance (RJA) of MC78L09ACDG in SOIC-8 package?
MC78L09ACDG's RJA is not fixed - it depends on PCB copper area. Per Figure 8 in the datasheet, RJA ranges from ~120°C/W (with 50 mm² copper) down to ~60°C/W (with 200 mm² symmetrical copper). The SOIC-8 package uses an internally modified lead frame where pins 2/3/6/7 connect to the die attach flag, enabling better heat transfer than standard SOIC-8.
Can MC78L09ACDG be used in automotive applications?
MC78L09ACDG is rated for 0°C to +125°C junction temperature and is not AEC-Q100 qualified. For automotive use, select the NCV78L09ABDR2G variant (−40°C to +125°C, AEC-Q100 qualified, PPAP capable). MC78L09ACDG is intended for commercial/industrial applications where extended low-temperature operation is not required.
MC78L09ACDG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 57dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC78L09ACDG FAQ
1.How can I place an order for MC78L09ACDG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L09ACDG 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 MC78L09ACDG reliable?
The price and inventory of MC78L09ACDG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L09ACDG is usually 5 days.
3.What payment methods are accepted for MC78L09ACDG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L09ACDG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L09ACDG?
MC78L09ACDG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L09ACDG 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 MC78L09ACDG?
For technical support, including MC78L09ACDG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L09ACDG requirements.
6.How does Aetrix verify that MC78L09ACDG is sourced from the original manufacturer or authorized distributors?
All MC78L09ACDG 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 MC78L09ACDG meets industry standards.
7.What is the process for return or replacement of MC78L09ACDG?
All MC78L09ACDG units undergo pre-shipment inspection (PSI). If there is an issue with MC78L09ACDG, 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 MC78L09ACDG part is unused and in its original packaging.
Return procedure for MC78L09ACDG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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