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onsemi MC78M08ACDT
- Part No.:
- MC78M08ACDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M08ACDT.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
MC78M08ACDT 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 power to microcontrollers, sensors, and analog circuitry in industrial control and automotive body electronics.
For engineers reviewing the MC78M08ACDT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, PCB layout guidance for DPAK-3 copper area, and validated alternatives for 8 V/500 mA linear regulation with automotive-grade temperature range support.
Technical Context
The MC78M08ACDT implements a monolithic NPN pass transistor with integrated bandgap reference, error amplifier, and protection circuitry. Its dropout voltage is fixed at 2.0 V (typical), enabling operation with input as low as 10.5 V across full load and temperature range.
It operates over TJ = 0°C to +125°C, supports up to 700 mA peak output current, and maintains ±0.2 mV/°C average temperature coefficient-critical for precision analog subsystems requiring stable biasing under thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0 V ±2% at 25°C - ensures tight tolerance for 8 V logic rails and analog references |
| Max Output Current | 500 mA continuous - sufficient for MCU cores, op-amps, and small peripheral ICs |
| Dropout Voltage | 2.0 V typical - enables use with 10.5 V minimum input in 12 V systems |
| Ripple Rejection | 56 dB at 120 Hz, 100 mA - suppresses AC line noise in battery-backed or filtered supplies |
| Thermal Shutdown | Internally activated above +150°C junction - prevents damage during overload or poor heatsinking |
| Quiescent Current | 3.2 mA typical - minimizes standby power loss in always-on subsystems |
| Operating Temp Range | 0°C to +125°C junction - qualified for under-hood and industrial ambient environments |
Pinout & Package
DPAK-3 (TO-252) package with exposed thermal pad (pin 2 connected to GND); compact 6.10 × 6.54 mm footprint optimized for high-power density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input (10.5–25 V); requires ≥0.33 µF bypass capacitor near pin |
| 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; stable into 500 mA load with ≤160 mV load regulation |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with internal feedback and compensation - eliminates need for external resistors or capacitors in basic configurations |
| ±2% output accuracy (MC78M08AC variant) | Tighter tolerance than standard MC78M08C (±3%) - reduces margining overhead in precision 8 V supply designs |
| Internal short-circuit current limiting | 350 mA typical short-circuit current - protects downstream circuitry during fault conditions without external fusing |
| Safe-area compensated pass transistor | Prevents second breakdown during transient overloads - enables reliable operation with capacitive or inductive loads |
| Pb-free, RoHS-compliant packaging | DPAK-3 case 369C with "G" suffix - meets global environmental compliance requirements for industrial and automotive production |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powering isolated 8 V analog sensor interfaces and digital I/O drivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local point-of-load regulator supplying clean 8 V to ADC reference buffers and optocoupler drivers. Use Value: ±2% output accuracy ensures consistent sensor scaling; thermal shutdown prevents field failure during ambient temperature excursions up to +70°C cabinet environment. | Use Scenario: Regulating 8 V for interior lighting controllers, window lift ECUs, and mirror adjustment modules. IC Role / Device Role / Timing Role: Primary 8 V supply for microcontroller peripherals and LIN transceivers in non-safety-critical vehicle subsystems. Use Value: 0°C to +125°C operation supports under-dash mounting; DPAK-3 thermal pad enables direct PCB heatsinking without discrete heatsink. |
| Medical Diagnostic Sensor Front-End | Point-of-Sale Terminal Power Management |
Use Scenario: Providing stable 8 V bias to low-noise instrumentation amplifiers and photodiode transimpedance stages. IC Role / Device Role / Timing Role: Precision analog rail generator with low 52 µV RMS output noise and 56 dB ripple rejection. Use Value: Low temperature coefficient (±0.2 mV/°C) maintains calibration stability across clinical operating temperatures; no external compensation needed simplifies FDA-regulated BOM. | Use Scenario: Supplying 8 V to thermal print head drivers and secure element ICs in retail payment terminals. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 12 V main supply, supporting burst-mode printing current demands. Use Value: 700 mA peak current capability handles 500 mA print head pulses; internal current limiting prevents latch-up during paper jam faults. |
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 accuracy (vs. ±2% for MC78M08ACDT); same DPAK-3 package and 0°C to +125°C range | Suitable where tighter tolerance is not required; lower cost for non-precision 8 V rails | Select when budget constraints outweigh need for ±2% regulation in non-critical analog paths |
| NCV78M08BDTRKG | −40°C to +125°C automotive grade; AEC-Q100 qualified; ±3% accuracy; same DPAK-3 package | Required for under-hood or safety-related modules needing extended temperature and PPAP compliance | Choose for automotive OEM programs requiring AEC-Q100 qualification and −40°C cold-crank operation |
Compared with MC78M08CDTRKG, the MC78M08ACDT offers tighter output tolerance for precision analog circuits; compared with NCV78M08BDTRKG, it trades automotive qualification for lower cost and simplified qualification in industrial applications.
Availability
MC78M08ACDT is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical sensor front-ends, and point-of-sale terminal power management requiring stable component supply and long-term manufacturability.
Supply support for MC78M08ACDT 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC78M00A series was designed to deliver high-accuracy, thermally robust linear regulation for space-constrained applications where simplicity, reliability, and wide temperature operation are critical-especially in automotive and industrial edge nodes.
FAQ
What is the maximum input voltage rating for the MC78M08ACDT?
The MC78M08ACDT has an absolute maximum input voltage of 40 Vdc, but its recommended operating input range is 10.5 Vdc to 25 Vdc for optimal regulation and thermal performance. Exceeding 25 Vdc increases power dissipation and may trigger thermal shutdown under full load.
Does the MC78M08ACDT require an input bypass capacitor?
Yes, the MC78M08ACDT requires a minimum 0.33 µF tantalum or ceramic capacitor placed directly across pins 1 (Input) and 2 (GND). This stabilizes operation under high-frequency load transients and prevents oscillation, especially when connected via long traces to upstream filtering.
How does the thermal performance of the MC78M08ACDT compare between DPAK-3 and TO-220 packages?
The MC78M08ACDT in DPAK-3 (case 369C) has θJC = 5.0°C/W and θJA = 92°C/W with standard PCB copper; TO-220 variants offer lower θJA (~70°C/W) but require larger board area. DPAK-3's exposed thermal pad enables superior heat transfer when soldered to ≥1 in² copper pour.
Can the MC78M08ACDT be used in current-source configurations?
Yes, the MC78M08ACDT can be configured as a constant-current source by connecting a resistor between output and load, leveraging its internal current limit and stable reference. Typical applications include LED biasing or sensor excitation, with current set by R = 8.0 V / IOUT, accounting for quiescent current.
Is the MC78M08ACDT pin-compatible with other MC78Mxx regulators?
Yes, all MC78Mxx devices in DPAK-3 (e.g., MC78M05CDTRKG, MC78M12CDTRKG) share identical pinout (Input-GND-Output) and footprint. This allows voltage-scaling flexibility within the same PCB layout-replacing MC78M08ACDT with MC78M12CDTRKG yields 12 V output without redesign.
MC78M08ACDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC78M08ACDT FAQ
1.How can I place an order for MC78M08ACDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08ACDT 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 MC78M08ACDT reliable?
The price and inventory of MC78M08ACDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ACDT is usually 5 days.
3.What payment methods are accepted for MC78M08ACDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ACDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08ACDT?
MC78M08ACDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08ACDT 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 MC78M08ACDT?
For technical support, including MC78M08ACDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ACDT requirements.
6.How does Aetrix verify that MC78M08ACDT is sourced from the original manufacturer or authorized distributors?
All MC78M08ACDT 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 MC78M08ACDT meets industry standards.
7.What is the process for return or replacement of MC78M08ACDT?
All MC78M08ACDT units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ACDT, 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 MC78M08ACDT part is unused and in its original packaging.
Return procedure for MC78M08ACDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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