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onsemi MC78M08ACDTG
- Part No.:
- MC78M08ACDTG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M08ACDTG.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,746
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Product details
Overview
MC78M08ACDTG from onsemi is a 500 mA, 8.0 V fixed-output linear voltage regulator in DPAK-3 (TO-252) package, featuring ±2% output accuracy at 25°C, internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local regulation. It delivers stable 8 V to microcontroller I/O rails, sensor analog supplies, and industrial control logic under varying load and input conditions.
For engineers reviewing the MC78M08ACDTG datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±2%), dropout voltage (2.0 V typical), ripple rejection (56 dB min at 100 mA/120 Hz), thermal protection behavior, and DPAK-3 PCB thermal performance with copper pad layout.
Technical Context
The MC78M08ACDTG implements a monolithic series pass transistor with integrated current limiting, thermal overload protection, and safe-area compensation-ensuring reliable operation without external components. Its architecture maintains regulation across input voltages from 10.5 V to 25 V while sustaining 500 mA continuous output current with adequate heatsinking.
It operates over an extended temperature range of 0°C to +125°C (TJ), supports peak output current up to 700 mA transiently, and exhibits low output noise (52 µVRMS, 10 Hz–100 kHz) suitable for noise-sensitive analog circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0 V nominal, ±2% tolerance at 25°C - ensures precise supply for 8 V logic or analog reference circuits |
| Max Output Current | 500 mA continuous - sufficient for MCU peripherals, small displays, and sensor signal chains |
| Dropout Voltage | 2.0 V typical at 350 mA - requires minimum 10 V input for stable 8 V output |
| Ripple Rejection | 56 dB minimum at 120 Hz, 100 mA - suppresses AC line noise in unregulated DC inputs |
| Line Regulation | 6.0 mV typical (10.5–25 V input) - minimizes output drift during input rail fluctuations |
| Load Regulation | 25 mV typical (5–500 mA load) - maintains tight voltage under dynamic load changes |
| Quiescent Current | 3.2 mA typical - enables low-power standby operation without significant bias loss |
Pinout & Package
DPAK-3 (TO-252) surface-mount package with exposed thermal pad (pin 2 connected to GND); compact 6.10 × 6.54 mm footprint optimized for thermal conduction via PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input (10.5–25 V); requires ≥0.33 µF bypass capacitor near pin for stability |
| 2 | GND | Ground reference and thermal pad connection; must be soldered to large copper pour for thermal management |
| 3 | Output | Regulated 8.0 V output; decoupling capacitor recommended at load point to reduce high-frequency noise |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with internal compensation - eliminates need for external capacitors or feedback resistors |
| ±2% output accuracy (MC78M08A variant) | Tighter tolerance than standard MC78M08C (±3%) - improves system-level voltage margin for 8 V interfaces |
| Internal thermal shutdown | Activates at ~150°C junction temperature - prevents damage during overload or poor heatsinking |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT increases - enhances reliability under fault conditions |
| Pb-free, RoHS-compliant DPAK-3 package | Meets environmental compliance requirements and supports reflow soldering with JEDEC-standard profile |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering digital isolators and CAN transceiver bias rails in modular I/O cards. IC Role / Device Role / Timing Role: Local 8 V supply generation from 12–24 V vehicle or factory bus. Use Value: ±2% accuracy ensures compatible logic levels with 8 V-tolerant interface ICs; thermal protection sustains operation during ambient temperature spikes. | Use Scenario: Supplying microcontroller core and peripheral voltage for door module ECUs. IC Role / Device Role / Timing Role: Primary 8 V regulator for non-AEC-Q100 subsystems requiring cost-effective, robust DC-DC conversion. Use Value: DPAK-3 thermal pad enables direct PCB heat sinking - avoids discrete heatsink in space-constrained modules. |
| Medical Patient Monitor Sensors | Point-of-Sale Terminal Logic Rails |
Use Scenario: Providing clean 8 V bias to precision analog front-end amplifiers and ADC references. IC Role / Device Role / Timing Role: Low-noise analog supply regulator with 52 µVRMS output noise. Use Value: Ripple rejection >56 dB at 120 Hz suppresses mains-derived interference in battery-backed systems. | Use Scenario: Powering 8 V EEPROMs, display drivers, and secure element ICs in retail terminals. IC Role / Device Role / Timing Role: Fixed-voltage local regulator replacing switching solutions where EMI must be minimized. Use Value: No external components reduce BOM count and layout complexity while meeting EN 55032 Class B emission limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M08CDTRKG | ±3% output tolerance (vs. ±2% for MC78M08ACDTG); same DPAK-3 package and electrical specs otherwise | Suitable for non-critical 8 V rails where tighter accuracy is not required | Select when cost sensitivity outweighs voltage precision needs |
| NCV78M08BDTRKG | −40°C to +125°C operating range (vs. 0°C to +125°C); AEC-Q100 qualified; same ±2% accuracy and DPAK-3 package | Required for automotive under-hood or chassis-mounted applications | Choose for automotive-grade designs needing extended temperature and qualification compliance |
Compared with MC78M08CDTRKG, the MC78M08ACDTG offers tighter output accuracy for precision analog or logic interfaces; compared with NCV78M08BDTRKG, it trades automotive qualification and wider temperature range for lower cost in commercial/industrial environments.
Availability
MC78M08ACDTG is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and consumer electronics requiring stable component supply with consistent lead times and full traceability.
Supply support for MC78M08ACDTG 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 supplier delivering energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The MC78M00A series was designed specifically for cost-sensitive, high-reliability local regulation in commercial and industrial equipment-emphasizing simplicity, ruggedness, and compatibility with legacy 78xx designs.
FAQ
What is the guaranteed output voltage tolerance for MC78M08ACDTG over temperature?
The MC78M08ACDTG guarantees ±2% output voltage tolerance at TJ = 25°C. Over the full operating junction temperature range (0°C to +125°C), output voltage variation remains within ±3% (7.76 V to 8.24 V) per the datasheet's "Output Voltage Variation" specification, ensuring predictable performance in thermally dynamic environments.
Can MC78M08ACDTG operate with an input voltage of 9.5 V?
No - MC78M08ACDTG requires a minimum input voltage of 10.5 V to maintain regulation at full load (500 mA), due to its 2.0 V typical dropout voltage. At 9.5 V input, the device enters dropout and cannot sustain 8.0 V output; design margin recommends ≥11 V input for reliable operation across line and load variations.
Does MC78M08ACDTG require an input bypass capacitor?
Yes - a minimum 0.33 µF tantalum or low-ESR ceramic capacitor is required across the input pins (pin 1 to pin 2) to ensure stability, especially with long PCB traces or high-impedance sources. The datasheet explicitly recommends this for all applications to prevent oscillation and improve high-frequency noise immunity.
How does the thermal pad on MC78M08ACDTG connect electrically?
The exposed thermal pad on the MC78M08ACDTG DPAK-3 package is internally connected to pin 2 (GND). It must be soldered to a dedicated GND copper pour on the PCB to provide both thermal conduction and electrical grounding - failure to connect it compromises thermal performance and may trigger premature thermal shutdown.
Is MC78M08ACDTG pin-compatible with other MC78Mxx regulators in DPAK-3?
Yes - all MC78MxxxDTRKG/DTG variants (e.g., MC78M05CDTRKG, MC78M12CDTRKG) share identical DPAK-3 pinout (Input-GND-Output), enabling drop-in replacement across output voltages when board layout and thermal design accommodate the specific voltage and current requirements.
MC78M08ACDTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC78M08ACDTG FAQ
1.How can I place an order for MC78M08ACDTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08ACDTG 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 MC78M08ACDTG reliable?
The price and inventory of MC78M08ACDTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ACDTG is usually 5 days.
3.What payment methods are accepted for MC78M08ACDTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ACDTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08ACDTG?
MC78M08ACDTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08ACDTG 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 MC78M08ACDTG?
For technical support, including MC78M08ACDTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ACDTG requirements.
6.How does Aetrix verify that MC78M08ACDTG is sourced from the original manufacturer or authorized distributors?
All MC78M08ACDTG 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 MC78M08ACDTG meets industry standards.
7.What is the process for return or replacement of MC78M08ACDTG?
All MC78M08ACDTG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ACDTG, 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 MC78M08ACDTG part is unused and in its original packaging.
Return procedure for MC78M08ACDTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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