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onsemi MC78M08CDTRK
- Part No.:
- MC78M08CDTRK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M08CDTRK.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,712
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Product details
Overview
MC78M08CDTRK from onsemi is a 500 mA, fixed +8.0 V positive linear voltage regulator in DPAK-3 (TO-252) package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local on-card regulation. It delivers stable output under input voltages from 10.5 V to 23 V and supports peak currents up to 700 mA for transient loads in industrial power rails.
For engineers reviewing the MC78M08CDTRK datasheet, pinout, applications, or equivalent options, this device is selected for cost-sensitive, non-adjustable 8 V supply generation where thermal robustness, minimal external components, and Pb-free compliance are required - especially in automotive body electronics, industrial controllers, and legacy analog subsystems.
Technical Context
The MC78M08CDTRK implements a monolithic series pass transistor with integrated protection circuitry: thermal overload detection triggers shutdown before junction temperature exceeds +150°C, while current limiting caps output at ~350 mA during sustained short-circuit conditions. Safe-area compensation dynamically reduces short-circuit current as input-output differential increases, preventing second breakdown.
It operates without external capacitors in low-noise, low-current applications but recommends ≥0.33 µF tantalum or ceramic input bypassing when connected via long traces or driving large capacitive loads. Dropout voltage remains fixed at 2.0 V across temperature and load, enabling predictable minimum input headroom design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.70–8.30 V at TJ = 25°C; ensures ±3.75% tolerance for 8 V nominal rail in commercial temperature range (0°C to +125°C) |
| Max Output Current | 500 mA continuous; sufficient for powering microcontroller peripherals, op-amps, and logic families without heatsinking under typical PCB copper |
| Dropout Voltage | 2.0 V typical; defines minimum VI − VO required for regulation - e.g., 10 V min input needed for stable 8 V output |
| Ripple Rejection | 56 dB at 120 Hz (IO = 100 mA); suppresses AC line ripple from unregulated DC supplies feeding downstream analog circuitry |
| Quiescent Current | 3.2–6.0 mA; low bias draw enables efficient operation in always-on subsystems like CAN transceiver bias rails |
| Operating Junction Temp | +150°C max; allows deployment in engine bay-adjacent modules or enclosed industrial enclosures without derating |
| Thermal Resistance θJA | 92°C/W (DPAK-3, free air); determines temperature rise above ambient - e.g., 4.6°C rise at 50 mW dissipation |
Pinout & Package
DPAK-3 (TO-252) surface-mount package with exposed thermal pad (pin 2 connected to GND), optimized for PCB heat spreading without discrete heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input (10.5–23 V); requires local 0.33 µF bypass capacitor to ground for stability |
| 2 | Ground | Reference node and thermal pad connection; must be soldered to ≥1 cm² copper pour for thermal performance |
| 3 | Output | Regulated +8.0 V supply; capable of sourcing up to 500 mA with ≤160 mV load regulation (5–500 mA) |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation: no feedback resistors, compensation networks, or external pass devices needed for basic 8 V supply |
| Internal thermal shutdown | Automatic disable at TJ ≥ +150°C; recovers autonomously after cooldown - eliminates need for external thermal monitoring |
| Short-circuit current limit | ~350 mA hard limit at VI = 35 V; protects IC and upstream supply during output faults without latch-up |
| Safe-area compensated pass transistor | Reduces short-circuit current as VI−VO increases - prevents destructive SOA violation during high-differential fault conditions |
| Pb-free and RoHS compliant | Meets JEDEC J-STD-609 Category 2a; compatible with lead-free reflow profiles and automotive AEC-Q100 requirements |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated analog sensor interfaces and digital I/O drivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local 8 V rail generator for op-amp signal conditioning stages and optocoupler LED drivers. Use Value: Eliminates need for switching regulator filtering; low noise (52 µV RMS) preserves ADC accuracy in 12-bit sensor front-ends. |
Use Scenario: Supplying window lift motor control logic and interior lighting drivers in door modules. IC Role / Device Role / Timing Role: Primary 8 V bias source for LIN transceivers and small-signal MOSFET gate drivers. Use Value: Withstands load dump transients up to 35 V input and survives −40°C to +125°C ambient per NCV-series qualification path. |
| Legacy Instrumentation Power | Point-of-Load for FPGA Peripherals |
Use Scenario: Replacing obsolete 7808 variants in field-deployed test equipment requiring long-term component continuity. IC Role / Device Role / Timing Role: Fixed 8 V supply for analog multiplexers, DAC reference buffers, and comparator hysteresis networks. Use Value: Pin-compatible with MC78M08C/AB variants; same footprint enables drop-in replacement without layout change. |
Use Scenario: Providing dedicated 8 V rail to DDR memory termination regulators and clock buffer ICs in embedded vision systems. IC Role / Device Role / Timing Role: Low-noise auxiliary supply decoupled from main 12 V system rail. Use Value: 80 dB ripple rejection at 300 mA load ensures clean timing margins for high-speed memory interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed positive voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M08BDTRKG | Wider operating temperature range (−40°C to +125°C) vs. MC78M08CDTRK (0°C to +125°C); otherwise identical electrical specs and DPAK-3 package | Suitable for under-hood automotive or outdoor industrial deployments requiring extended cold-start capability | Select MC78M08BDTRKG when ambient temperatures may fall below 0°C; no PCB or firmware changes needed |
| NCV78M08BDTRKG | AEC-Q100 qualified, PPAP-capable, with enhanced process controls and traceability; identical pinout and electrical behavior | Required for safety-critical automotive applications including BCM, lighting control, and ADAS sensor hubs | Choose NCV78M08BDTRKG for production automotive programs needing certified reliability and supply chain governance |
Compared with MC78M08CDTRK, MC78M08BDTRKG extends cold-temperature operation without trade-offs, while NCV78M08BDTRKG adds automotive-grade validation - both retain identical 8 V output, 500 mA rating, and DPAK-3 thermal profile for seamless integration.
Availability
MC78M08CDTRK is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and legacy instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MC78M08CDTRK 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 markets.
The MC78M00 series was designed as a robust, low-cost alternative to the classic 78xx family - optimized for local regulation in space-constrained, thermally demanding environments where simplicity and reliability outweigh programmability.
FAQ
What is the guaranteed output voltage tolerance of MC78M08CDTRK over temperature?
The MC78M08CDTRK guarantees an output voltage of 7.6 V to 8.4 V across its full operating temperature range (0°C to +125°C) and load current (5 mA to 350 mA), corresponding to ±5% variation from nominal 8.0 V - verified per onsemi's MC78M08C/AC/B/AB datasheet specifications.
Can MC78M08CDTRK be used without an input bypass capacitor?
MC78M08CDTRK can operate without an input bypass capacitor in low-noise, low-current applications with short PCB traces to the input source; however, onsemi recommends ≥0.33 µF tantalum or ceramic capacitance directly across pins 1 and 2 to ensure stability when input impedance is high or trace inductance is present - critical for reliable startup and transient response in MC78M08CDTRK designs.
What is the maximum allowable input voltage for MC78M08CDTRK?
The absolute maximum input voltage for MC78M08CDTRK is 40 VDC, as specified in the Maximum Ratings table; however, continuous operation above 23 V is not recommended due to excessive power dissipation - the device is characterized for stable regulation with input voltages between 10.5 V and 23 V per its Electrical Characteristics table.
Does MC78M08CDTRK require a heatsink for 500 mA operation?
MC78M08CDTRK does not require an external heatsink for 500 mA operation if mounted on ≥1 cm² of 2 oz. copper with thermal vias; its DPAK-3 package has θJA = 92°C/W in free air, resulting in ~9.2°C rise above ambient at full load - well within the +150°C junction limit. Larger copper areas further reduce thermal resistance for sustained duty cycles.
Is MC78M08CDTRK pin-compatible with other MC78Mxx regulators in DPAK-3?
Yes, MC78M08CDTRK shares identical DPAK-3 pinout (Input-Ground-Output), thermal pad connection, and footprint with all MC78MxxC/AC/B/AB variants in the same package - including MC78M05CDTRKG, MC78M12CDTRKG, and MC78M15CDTRKG - enabling voltage-scaling flexibility without PCB redesign.
MC78M08CDTRK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- 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
MC78M08CDTRK FAQ
1.How can I place an order for MC78M08CDTRK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08CDTRK 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 MC78M08CDTRK reliable?
The price and inventory of MC78M08CDTRK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08CDTRK is usually 5 days.
3.What payment methods are accepted for MC78M08CDTRK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08CDTRK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08CDTRK?
MC78M08CDTRK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08CDTRK 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 MC78M08CDTRK?
For technical support, including MC78M08CDTRK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08CDTRK requirements.
6.How does Aetrix verify that MC78M08CDTRK is sourced from the original manufacturer or authorized distributors?
All MC78M08CDTRK 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 MC78M08CDTRK meets industry standards.
7.What is the process for return or replacement of MC78M08CDTRK?
All MC78M08CDTRK units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08CDTRK, 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 MC78M08CDTRK part is unused and in its original packaging.
Return procedure for MC78M08CDTRK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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