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onsemi MC78L08ACD
- Part No.:
- MC78L08ACD
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L08ACD.pdf
- Description:
- IC REG LINEAR 8V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
MC78L08ACD from onsemi is a 100 mA, fixed +8.0 V 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 analog and digital supply rails.
For engineers reviewing the MC78L08ACD datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal performance data, TO-92/SOIC-8 package mapping, and real-world use cases for embedded power management, sensor interface supplies, and industrial control logic rails.
Technical Context
The MC78L08ACD implements a monolithic series-pass transistor architecture with built-in thermal overload protection and foldback current limiting. Its internal reference and error amplifier maintain output regulation across line (10.5–23 V input) and load (1–100 mA) variations without external compensation.
Designed for cost-sensitive, space-constrained applications, it delivers stable +8.0 V output with ±3% tolerance at 25°C, 37–57 dB ripple rejection at 120 Hz, and 60 µV RMS output noise (10 Hz–100 kHz), making it suitable for analog front-ends and microcontroller I/O supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, 7.6–8.4 V over full operating range - ensures compatibility with 8 V logic families and analog circuits requiring tight DC bias. |
| Max Output Current | 100 mA - supports low-power microcontrollers, op-amps, and sensors without external pass devices. |
| Dropout Voltage | 1.7 V typical at 25°C - enables operation from 9.7 V minimum input, reducing heat dissipation vs. higher-dropout regulators. |
| Ripple Rejection | 37 dB min / 57 dB typ at 120 Hz - suppresses AC line ripple in unregulated wall-adapter or battery-charger-derived supplies. |
| Thermal Resistance (RJA) | Refer to Figure 8 - SOIC-8 package achieves lower RJA than TO-92 when mounted on ≥3 mm copper traces, enabling higher ambient operation. |
| Input Voltage Range | 10.5–23 V DC - compatible with 12 V nominal systems including automotive accessory rails and industrial 24 V derivatives. |
| Operating Temp Range | 0°C to +125°C junction - qualified for commercial/industrial environments excluding extended automotive (-40°C). |
Pinout & Package
MC78L08ACD uses the SOIC-8 (Case 751) package with internally modified lead frame: pins 2, 3, 6, and 7 are electrically common to the die attach flag, lowering thermal resistance and improving power dissipation capability when PCB copper area is optimized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated +8.0 V output - connects directly to load; requires 0.1 µF ceramic bypass capacitor for transient response. |
| 2 | GND | Ground reference for both input and output - must share common ground path with input source to avoid regulation error. |
| 3 | GND | Ground reference (electrically tied to pin 2) - improves thermal conduction via internal flag connection in SOIC-8. |
| 4 | VIN | Unregulated input (10.5–23 V) - requires 0.33 µF input bypass capacitor if located >2 cm from bulk filter. |
| 5 | GND | Ground reference (electrically tied to pins 2 & 3) - enhances thermal path and reduces ground impedance. |
| 6 | GND | Ground reference (electrically tied to pins 2, 3 & 5) - part of internal flag structure for improved heatsinking. |
| 7 | GND | Ground reference (electrically tied to pins 2, 3, 5 & 6) - maximizes PCB copper utilization for thermal management. |
| 8 | NC | No connect - not bonded; must remain unconnected per design to prevent parasitic coupling or latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| Internal short-circuit limiting | Prevents catastrophic failure during output faults; limits current to safe levels without external sensing resistors. |
| Thermal shutdown protection | Automatically disables output above ~150°C junction temperature, enabling self-recovery after cooling. |
| No external components required | Stable operation with only input/output capacitors - reduces BOM count and PCB footprint in space-constrained designs. |
| Pb-free SOIC-8 packaging | Complies with RoHS Directive 2011/65/EU; compatible with standard reflow profiles and automated assembly. |
| Low quiescent current | Typical 3.0 mA at 25°C - minimizes standby power loss in battery-backed or energy-harvesting systems. |
Applications
| Industrial Sensor Interface | Microcontroller I/O Supply |
|---|---|
Use Scenario: Powers analog-output temperature/humidity sensors in factory automation nodes where 8 V excitation or bias is required. IC Role / Device Role / Timing Role: Provides clean, regulated 8 V rail isolated from noisy 24 V plant bus using simple RC filtering. Use Value: Maintains sensor accuracy by delivering <60 µV RMS noise and rejecting >37 dB of 120 Hz ripple from switch-mode power supplies. | Use Scenario: Supplies 8 V to legacy 8-bit MCU peripherals (e.g., LCD drivers, DACs) in medical handheld devices. IC Role / Device Role / Timing Role: Acts as dedicated I/O voltage source decoupled from core logic rail to prevent digital switching noise injection. Use Value: Enables stable analog peripheral operation with ±3% output tolerance and 1.7 V dropout-reducing input supply headroom requirements. |
| Programmable Logic Controller (PLC) Auxiliary Rail | Test & Measurement Equipment Bias |
Use Scenario: Generates auxiliary 8 V supply for optocoupler input stages and level-shifting circuits in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Delivers isolated, current-limited 8 V to interface circuitry while surviving 30 V transients per absolute max rating. Use Value: Internal thermal shutdown prevents latch-up during sustained overloads caused by field wiring faults or ESD events. | Use Scenario: Supplies precision op-amp bias in portable multimeters and signal generators requiring low-noise, stable DC references. IC Role / Device Role / Timing Role: Functions as low-drift, low-noise local regulator for analog signal chains downstream of main SMPS. Use Value: Achieves 60 µV RMS noise floor and 57 dB ripple rejection-critical for sub-mV measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L08ACP | TO-92 package, same electrical specs, 0°C to +125°C range - higher RJA (200°C/W) limits power handling. | Suitable for low-density through-hole boards or prototyping; lacks SOIC-8 thermal advantages. | Select when manual assembly, legacy board compatibility, or minimal component height is prioritized over thermal performance. |
| LM78L08ACM | SOIC-8 package, same 8 V output and 100 mA rating, but higher dropout (2.0 V typ) and lower ripple rejection (30 dB min). | Acceptable for non-critical 8 V rails where input headroom >10 V is available and noise immunity is secondary. | Choose only if MC78L08ACD is unavailable; verify thermal margin and ripple performance in final layout. |
Compared with MC78L08ACP and LM78L08ACM, the MC78L08ACD offers superior thermal performance in SOIC-8 due to its internal flag-connected ground pins, lower typical dropout (1.7 V vs. 2.0 V), and higher ripple rejection-making it optimal for compact, thermally demanding industrial PCBs.
Availability
MC78L08ACD is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O supplies, programmable logic controller auxiliary rails, and test & measurement equipment bias requiring stable component supply and long-term manufacturability.
Supply support for MC78L08ACD 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, rugged fixed-voltage regulation for commercial and industrial applications where simplicity, reliability, and thermal robustness outweigh programmability or ultra-low quiescent current needs.
FAQ
What is the maximum input voltage for MC78L08ACD?
The absolute maximum input voltage for MC78L08ACD is 35 V DC when operating within the 12–18 V input range category per datasheet Absolute Maximum Ratings. However, for reliable continuous operation at 100 mA output, the recommended maximum is 23 V DC to maintain thermal safety margins and ensure specified line regulation performance.
Does MC78L08ACD require input and output capacitors?
Yes, MC78L08ACD requires a 0.33 µF input capacitor (tantalum, mylar, or low-ESR ceramic) when placed >2 cm from the power supply filter, and a 0.1 µF output capacitor is recommended to improve transient response-even though it's not required for stability. These values are validated in the datasheet's standard application circuit.
Is MC78L08ACD pin-compatible with other MC78L00A variants?
Yes, all MC78L00A-series SOIC-8 variants-including MC78L05ACD, MC78L09ACD, and MC78L12ACD-share identical pinouts (VOUT, GND, GND, VIN, GND, GND, GND, NC). This allows direct substitution in the same footprint when only output voltage differs, provided input voltage and thermal constraints are re-verified.
What is the thermal resistance (RJA) of MC78L08ACD in SOIC-8 package?
The thermal resistance (RJA) of MC78L08ACD in SOIC-8 package is not a fixed value-it depends on PCB copper area and layout. Per Figure 8 in the datasheet, RJA ranges from ~120°C/W (with 30 mm² copper) down to ~60°C/W (with 200 mm² copper). Unlike TO-92 (200°C/W), SOIC-8 performance scales with board-level thermal design.
Can MC78L08ACD be used in automotive applications?
MC78L08ACD is rated for 0°C to +125°C junction temperature and is not AEC-Q100 qualified. For automotive applications, use the NCV78L08ABDR2G variant instead, which features −40°C to +125°C operation, PPAP capability, and automotive-specific change control-ensuring compliance with vehicle-grade reliability requirements.
MC78L08ACD 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):
- 8V
- 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
MC78L08ACD FAQ
1.How can I place an order for MC78L08ACD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L08ACD 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 MC78L08ACD reliable?
The price and inventory of MC78L08ACD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L08ACD is usually 5 days.
3.What payment methods are accepted for MC78L08ACD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L08ACD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L08ACD?
MC78L08ACD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L08ACD 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 MC78L08ACD?
For technical support, including MC78L08ACD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L08ACD requirements.
6.How does Aetrix verify that MC78L08ACD is sourced from the original manufacturer or authorized distributors?
All MC78L08ACD 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 MC78L08ACD meets industry standards.
7.What is the process for return or replacement of MC78L08ACD?
All MC78L08ACD units undergo pre-shipment inspection (PSI). If there is an issue with MC78L08ACD, 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 MC78L08ACD part is unused and in its original packaging.
Return procedure for MC78L08ACD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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