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onsemi MC78M08ABTG
- Part No.:
- MC78M08ABTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC78M08ABTG.pdf
- Description:
- IC REG LINEAR 8V 500MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:270
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Product details
Overview
MC78M08ABTG from onsemi is a 500 mA fixed-output +8.0 V positive 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 board-level regulation. It delivers stable 8 V to microcontroller peripherals, sensor interfaces, and industrial control logic under varying load and input conditions.
For engineers reviewing the MC78M08ABTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world use cases, and validated alternative parts for automotive-grade 8 V power rail design.
Technical Context
The MC78M08ABTG uses a monolithic bipolar pass transistor with integrated protection circuitry - including thermal overload detection that disables output above ~150°C junction temperature, and current-limiting that caps peak output at ~350 mA during sustained short-circuit events. Its dropout voltage remains fixed at ~2.0 V across operating temperature and load range.
Designed for fixed-voltage operation without external components, it achieves ±2% initial output tolerance (MC78M08AB variant), supports input voltages from 10.5 V to 23 V, and maintains regulation over −40°C to +125°C ambient with adequate PCB copper heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±2% accuracy at TJ = 25°C - ensures tight supply margin for 8 V logic and analog circuits |
| Max Output Current | 500 mA continuous - sufficient for powering multiple low-power ICs or small motor drivers |
| Input Voltage Range | 10.5 V to 23 V DC - compatible with 12 V automotive and industrial bus systems |
| Dropout Voltage | 2.0 V typical - requires minimum 10 V input to sustain 8 V output under full load |
| Thermal Shutdown | Activates at TJ ≥ +150°C - prevents permanent damage during transient overloads or poor heatsinking |
| Ripple Rejection | 56 dB at 120 Hz, IO = 100 mA - suppresses AC ripple from unregulated DC supplies |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
DPAK-3 (TO-252) surface-mount package with exposed thermal pad connected to Pin 2 (GND). Heatsink surface is electrically tied to ground terminal for efficient thermal transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input connection; must be bypassed with ≥0.33 µF capacitor near device |
| Pin 2 | Ground | Reference node and thermal path; connects to exposed pad and system GND plane |
| Pin 3 | Output | Regulated +8.0 V output; requires minimal output capacitance for stability |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation enables compact layout with only input/output capacitors |
| ±2% output voltage accuracy | Reduces need for post-regulation trimming in precision 8 V applications |
| Internal short-circuit current limit | Clamps output at ~350 mA to protect both regulator and downstream circuitry |
| Safe-area compensated pass transistor | Prevents secondary breakdown during high-VCE/IC transients |
| Pb-free DPAK-3 package | RoHS-compliant footprint with thermal pad optimized for 2 oz. copper PCB heatsinking |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Supplies 8 V to microcontroller peripherals and CAN transceiver bias in body control units. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 12 V battery to stable 8 V for logic and interface ICs. Use Value: −40°C to +125°C rating and AEC-Q100 alignment enable direct integration into under-dash electronics without derating. | Use Scenario: Powers isolated digital input conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-voltage source for optocoupler LED drivers and level-shifting buffers. Use Value: 500 mA output and 56 dB ripple rejection maintain clean 8 V supply despite noisy 24 V industrial bus coupling. |
| Medical Patient Monitor Sensor Interface | Test Equipment Auxiliary Supply |
Use Scenario: Provides low-noise 8 V bias to analog front-end amplifiers and ADC reference buffers. IC Role / Device Role / Timing Role: Precision analog supply regulator with <52 µV RMS noise (10 Hz–100 kHz). Use Value: ±2% accuracy and ±0.2 mV/°C tempco ensure stable sensor excitation and reference integrity across operating range. | Use Scenario: Generates auxiliary 8 V rail for FPGA configuration and clock buffer ICs in benchtop instruments. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main 5 V/3.3 V domains. Use Value: Internal thermal shutdown prevents latch-up during hot-swap or firmware update sequences with variable load profiles. |
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 | Same 8 V output but ±4% accuracy and 0°C to +125°C temp range | Suitable for non-automotive commercial designs where cost sensitivity outweighs precision | Select when tighter voltage tolerance and extended temperature range are not required |
| NCV78M08BDTRKG | Identical specs to MC78M08ABTG but AEC-Q100 certified with PPAP support | Required for production automotive ECUs needing full qualification documentation | Choose for Tier-1 automotive programs requiring traceable compliance and change control |
Compared with MC78M08CDTRKG, MC78M08ABTG offers higher accuracy and wider temperature range; compared with NCV78M08BDTRKG, it lacks formal AEC-Q100 certification but shares identical electrical behavior and packaging - making it ideal for pre-production validation or non-automotive industrial use.
Availability
MC78M08ABTG is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical sensor modules, and test equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for MC78M08ABTG 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MC78Mxx series was designed as a robust, drop-in replacement for legacy 78xx regulators - optimized for local voltage regulation in space-constrained, thermally demanding environments with built-in protection and extended temperature capability.
FAQ
What is the maximum input voltage for MC78M08ABTG?
The absolute maximum input voltage for MC78M08ABTG is 40 V DC, but the recommended operating range is 10.5 V to 23 V to ensure proper regulation and thermal safety. Exceeding 23 V increases power dissipation and may trigger thermal shutdown under full 500 mA load without adequate heatsinking.
Does MC78M08ABTG require input and output capacitors?
Yes - MC78M08ABTG requires a minimum 0.33 µF input capacitor (tantalum or ceramic) placed close to Pin 1, and a 0.1 µF output capacitor is recommended for stability. These values prevent oscillation and improve transient response, especially with long input traces or large capacitive loads.
Is MC78M08ABTG pin-compatible with other 78Mxx regulators?
Yes - MC78M08ABTG uses the standard DPAK-3 (TO-252) pinout: Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. This matches all MC78Mxx, NCV78Mxx, and compatible 78Mxx-family regulators in the same package, enabling direct substitution within the same footprint.
What is the thermal resistance of MC78M08ABTG in DPAK-3 package?
MC78M08ABTG has θJA = 92°C/W (junction-to-air, no heatsink) and θJC = 5.0°C/W (junction-to-case). With 1-inch² of 2 oz. copper on the thermal pad, effective θJA improves to ~40°C/W - enabling 500 mA operation up to +70°C ambient without forced airflow.
Can MC78M08ABTG be used in automotive applications?
MC78M08ABTG operates over −40°C to +125°C and meets automotive-grade reliability requirements, but it is not AEC-Q100 certified. For production automotive use, specify NCV78M08BDTRKG instead; MC78M08ABTG is appropriate for prototyping, aftermarket modules, or non-safety-critical vehicle subsystems.
MC78M08ABTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC78M08ABTG FAQ
1.How can I place an order for MC78M08ABTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08ABTG 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 MC78M08ABTG reliable?
The price and inventory of MC78M08ABTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ABTG is usually 5 days.
3.What payment methods are accepted for MC78M08ABTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ABTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08ABTG?
MC78M08ABTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08ABTG 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 MC78M08ABTG?
For technical support, including MC78M08ABTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ABTG requirements.
6.How does Aetrix verify that MC78M08ABTG is sourced from the original manufacturer or authorized distributors?
All MC78M08ABTG 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 MC78M08ABTG meets industry standards.
7.What is the process for return or replacement of MC78M08ABTG?
All MC78M08ABTG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ABTG, 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 MC78M08ABTG part is unused and in its original packaging.
Return procedure for MC78M08ABTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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