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onsemi MC78M05ACDTG
- Part No.:
- MC78M05ACDTG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M05ACDTG.pdf
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,611
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Product details
Overview
MC78M05ACDTG from onsemi is a 5.0 V, ±2% accuracy, 500 mA fixed-output linear voltage regulator in DPAK-3 (TO-252) package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It operates over 0°C to +125°C junction temperature and delivers stable local regulation for microcontroller power rails, sensor interfaces, and industrial control modules.
For engineers reviewing the MC78M05ACDTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, thermal performance data, real-world design guidance for input/output capacitance, dropout behavior, and validated alternative parts for automotive-grade or higher-accuracy use cases.
Technical Context
The MC78M05ACDTG implements a classic three-terminal series pass architecture with PNP output transistor, internal bandgap reference, and error amplifier. Its ±2% output voltage tolerance (at TJ = 25°C) and ±0.2 mV/°C temperature coefficient reflect high-precision trimming in the MC78M00A variant family.
It features fixed 5.0 V output, 2.0 V typical dropout voltage at 500 mA, 62 dB ripple rejection at 120 Hz (IO = 100 mA), and 40 µV RMS output noise (10 Hz–100 kHz). Thermal protection activates at +150°C junction temperature, and short-circuit current is internally limited to 350 mA (typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% (tight tolerance enables direct powering of 5 V logic without external trimming) |
| Max Output Current | 500 mA continuous (requires heatsinking above ~200 mA in free-air DPAK) |
| Dropout Voltage | 2.0 V typical at 500 mA (minimum input = 7.0 V for stable 5 V output) |
| Ripple Rejection | 62 dB at 120 Hz, IO = 100 mA (effective suppression of rectified AC noise) |
| Thermal Shutdown | Activates at TJ ≥ +150°C (prevents permanent damage during overload or poor heatsinking) |
| Quiescent Current | 3.2 mA typical (low no-load consumption ideal for battery-backed systems) |
| Operating Temp Range | 0°C to +125°C junction (commercial-grade rating, not automotive) |
Pinout & Package
DPAK-3 (TO-252) surface-mount package with exposed thermal pad connected to Pin 2 (Ground). Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. Heatsink surface is electrically tied to ground for optimal thermal conduction and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (VI ≤ 35 V max); requires ≥0.33 µF low-ESR bypass capacitor |
| Pin 2 | Ground | Common reference and thermal path; connects to PCB ground plane and heatsink surface |
| Pin 3 | Output | Regulated 5.0 V supply; requires ≥0.1 µF ceramic output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with integrated pass transistor, reference, and error amp - eliminates need for external feedback resistors or compensation networks |
| ±2% output voltage accuracy | MC78M05ACDTG variant guarantees tighter tolerance than standard MC78M05CDTG (±5%), reducing system-level calibration burden |
| Internal safe-area compensation | Automatically reduces short-circuit current as VI–VO increases, preventing second breakdown of the output transistor |
| Pb-free DPAK-3 package | RoHS-compliant TO-252 footprint with 6.10 × 6.54 mm body and 2.29 mm lead pitch - compatible with standard SMT reflow profiles |
| Thermal overload protection | Shuts down output when junction exceeds +150°C and auto-recovers after cooldown - prevents irreversible silicon damage |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powering isolated 5 V digital logic and analog sensor front-ends in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator supplying clean 5 V to microcontrollers, ADCs, and optocouplers. Use Value: ±2% accuracy ensures consistent ADC reference and logic threshold margins; 500 mA headroom supports multiple peripherals without derating. | Use Scenario: Regulating 5 V supply for door module microcontrollers and LIN transceivers in non-safety-critical zones. IC Role / Device Role / Timing Role: Secondary regulator downstream of main vehicle battery converter, providing stable 5 V rail. Use Value: Internal short-circuit protection prevents latch-up during wiring faults; thermal shutdown avoids thermal runaway in enclosed enclosures. |
| Medical Patient Monitor Front-End | Consumer Smart Home Hub |
Use Scenario: Supplying 5 V to low-noise op-amps and signal-conditioning circuits in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise linear regulator for analog signal chain biasing, minimizing interference with sensitive biopotential measurements. Use Value: 40 µV RMS output noise (10 Hz–100 kHz) and 62 dB ripple rejection preserve SNR in sub-mV biomedical signals. | Use Scenario: Providing regulated 5 V to Wi-Fi SoC, USB peripherals, and LED drivers in always-on home automation hubs. IC Role / Device Role / Timing Role: Primary 5 V power source for mixed-signal subsystems requiring low quiescent current and robust transient response. Use Value: 3.2 mA typical IQ enables >1-year battery life in backup operation; DPAK thermal pad simplifies thermal management on dense 4-layer PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M05CDTRKG | Same DPAK-3 package, but ±5% output tolerance (not ±2%) and identical 0°C to +125°C range | Lower-cost option where 5 V ±5% is acceptable (e.g., non-critical digital rails) | Select MC78M05CDTRKG only if system-level tolerance budget allows looser regulation; no PCB change needed. |
| NCV78M05ABDTRKG | Automotive-grade variant with −40°C to +125°C operating range and AEC-Q100 qualification; same ±2% accuracy | Required for under-hood or chassis-mounted automotive applications subject to extended temperature cycling | Choose NCV78M05ABDTRKG when automotive qualification, extended temp range, or PPAP documentation is mandatory. |
Compared with MC78M05CDTRKG, the MC78M05ACDTG offers tighter output accuracy critical for precision analog circuits; compared with NCV78M05ABDTRKG, it lacks automotive qualification but costs less and suits commercial industrial designs where −40°C operation is unnecessary.
Availability
MC78M05ACDTG is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and consumer smart devices requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for MC78M05ACDTG 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC78M00A series was designed to deliver high-accuracy, rugged linear regulation for cost-sensitive industrial and commercial applications where simplicity, reliability, and thermal robustness outweigh switching efficiency requirements.
FAQ
What is the maximum input voltage rating for MC78M05ACDTG?
The absolute maximum input voltage for MC78M05ACDTG is 35 V DC under normal operating conditions. Exceeding this value risks permanent damage due to internal junction breakdown. For reliable operation with 24 V nominal systems, ensure transient spikes remain below 35 V - consider adding a TVS diode if input surge risk exists.
Does MC78M05ACDTG require input and output capacitors?
Yes, MC78M05ACDTG requires a minimum 0.33 µF input capacitor (tantalum or low-ESR ceramic) placed directly across Pins 1 and 2, and a minimum 0.1 µF output capacitor (ceramic) across Pins 2 and 3. These stabilize loop response and suppress high-frequency noise; omitting them may cause oscillation or poor transient performance.
How does the thermal performance of MC78M05ACDTG compare between DPAK and TO-220 packages?
MC78M05ACDTG in DPAK-3 has θJA = 92°C/W (free air) and θJC = 5.0°C/W, while TO-220 variants (e.g., MC78M05CTG) achieve θJA = 70°C/W. The DPAK's lower θJC enables better heat transfer to PCB copper, but its higher θJA means it relies more heavily on board-level thermal design - use ≥2 oz. copper and thermal vias under the pad.
Can MC78M05ACDTG be used in adjustable configurations?
MC78M05ACDTG is a fixed 5.0 V regulator and cannot be adjusted via external resistors. However, it can serve as the reference element in an adjustable configuration using an external op-amp (e.g., MC1741), as shown in Figure 11 of the datasheet - the minimum output becomes 7.0 V (5.0 V + 2.0 V headroom).
Is MC78M05ACDTG pin-compatible with other MC78Mxx regulators?
Yes, all MC78Mxx devices in DPAK-3 (e.g., MC78M05ACDTG, MC78M12CDTRKG) share identical pinout: Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. This allows drop-in replacement across output voltages when board layout accommodates different thermal and input voltage requirements.
MC78M05ACDTG 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):
- 5V
- 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
MC78M05ACDTG FAQ
1.How can I place an order for MC78M05ACDTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M05ACDTG 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 MC78M05ACDTG reliable?
The price and inventory of MC78M05ACDTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M05ACDTG is usually 5 days.
3.What payment methods are accepted for MC78M05ACDTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M05ACDTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M05ACDTG?
MC78M05ACDTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M05ACDTG 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 MC78M05ACDTG?
For technical support, including MC78M05ACDTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M05ACDTG requirements.
6.How does Aetrix verify that MC78M05ACDTG is sourced from the original manufacturer or authorized distributors?
All MC78M05ACDTG 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 MC78M05ACDTG meets industry standards.
7.What is the process for return or replacement of MC78M05ACDTG?
All MC78M05ACDTG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M05ACDTG, 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 MC78M05ACDTG part is unused and in its original packaging.
Return procedure for MC78M05ACDTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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