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onsemi MC78M08ACTG
- Part No.:
- MC78M08ACTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC78M08ACTG.pdf
- Description:
- IC REG LINEAR 8V 500MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
MC78M08ACTG from onsemi is a 500 mA, 8.0 V fixed-output linear voltage regulator in DPAK-3 (TO-252) package, featuring ±2% output accuracy, internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local regulation. It delivers stable 8 V to microcontrollers, sensors, and analog circuitry in industrial control modules where input voltage ranges from 10.5 V to 23 V.
For engineers reviewing the MC78M08ACTG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The MC78M08ACTG implements a monolithic three-terminal series pass regulator architecture with built-in protection: thermal overload shutdown activates at +150°C junction temperature, short-circuit current limit holds peak output at 350 mA under fault, and safe-area compensation dynamically reduces short-circuit current as input-to-output differential increases.
It operates across −40°C to +125°C ambient (TJ = −40°C to +125°C), supports up to 35 V maximum input voltage, and maintains 8.0 V output with ≤6 mV line regulation (10.5–25 V input) and ≤25 mV load regulation (5–500 mA load), enabling reliable operation in automotive body electronics and industrial power rails without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.84 V to 8.16 V at 25°C - ensures ±2% tolerance meets tight analog supply requirements for op-amps and ADC references. |
| Max Output Current | 500 mA continuous - sufficient for powering multiple low-power ICs (e.g., MCU + sensor + interface) from a single regulator. |
| Dropout Voltage | 2.0 V typical - requires minimum 10 V input to sustain 8 V output, compatible with 12 V nominal systems with ripple. |
| Ripple Rejection | 56 dB at 120 Hz (100 mA load) - suppresses rectified AC noise in offline power supplies before sensitive analog stages. |
| Quiescent Current | 3.2 mA typical - enables low standby power in always-on industrial monitoring nodes. |
| Operating Temp Range | −40°C to +125°C - qualified for under-hood automotive and factory-floor embedded applications. |
| Thermal Resistance θJA | 92°C/W (DPAK-3, no heatsink) - mandates PCB copper area ≥25 mm² for full 500 mA at 70°C ambient. |
Pinout & Package
DPAK-3 (TO-252) package with exposed thermal pad connected to Pin 2 (Ground); heatsink surface electrically tied to GND for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Accepts unregulated DC input (10.5–35 V); requires ≥0.33 µF low-ESR ceramic bypass capacitor placed within 5 mm. |
| Pin 2 | Ground | Common reference and thermal path; must be connected to large copper pour for heat dissipation and noise immunity. |
| Pin 3 | Output | Delivers regulated 8.0 V; output capacitance ≥0.1 µF required for stability; low-ESR tantalum or ceramic recommended. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Operates stably with only input/output capacitors - eliminates BOM cost and layout complexity for basic regulation. |
| ±2% output accuracy (MC78M08AC variant) | Tighter than standard ±4% MC78M08C - reduces need for post-regulation trimming in precision analog subsystems. |
| Internal thermal shutdown | Auto-recovery after cooldown - prevents permanent damage during transient overloads without system-level intervention. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN−VOUT rises - protects device during brown-out or high-differential startup conditions. |
| Pb-free DPAK-3 package | RoHS-compliant, JEDEC-standard footprint - enables drop-in replacement in legacy designs and simplifies environmental compliance. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers isolated digital input conditioning circuits and CAN transceiver bias rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local 8 V supply for optocoupler drivers and level-shifting logic, decoupled from noisy 24 V field bus. Use Value: ±2% accuracy ensures consistent LED current drive and Schmitt-trigger thresholds across temperature; thermal shutdown prevents latch-up during surge events. |
Use Scenario: Supplies 8 V to door module microcontrollers and window motor drivers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Primary regulated rail for MCU core and peripheral logic, operating across cold-crank (6.5 V) to load-dump (35 V) extremes. Use Value: −40°C to +125°C rating and 35 V max input withstand capability enable direct connection to battery without pre-regulator; safe-area compensation avoids destructive latch-up during alternator transients. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
|
Use Scenario: Provides clean 8 V bias to analog front-end amplifiers and ADC reference buffers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise analog supply rail, isolated from digital switching noise via dedicated ground plane and ferrite bead filtering. Use Value: 52 µV RMS output noise and 56 dB ripple rejection preserve signal integrity for sub-12-bit medical-grade measurements; no external compensation needed saves board space. |
Use Scenario: Regulates 8 V for thermal print head driver ICs and secure element ICs in retail kiosks with intermittent 12 V adapter input. IC Role / Device Role / Timing Role: Main power rail for high-current pulsed loads (print head activation) and security-critical crypto ICs requiring stable voltage. Use Value: 700 mA peak current capability handles print head surge without brownout; internal short-circuit limiting protects against print head coil shorts without fuse replacement. |
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 | ±4% output accuracy (vs. ±2% for MC78M08ACTG); same DPAK-3 package and −40°C to +125°C range. | Suitable for non-critical digital logic rails where tighter regulation is unnecessary; lower cost for cost-sensitive consumer applications. | Select when ±4% tolerance is acceptable and budget constraints outweigh precision requirements. |
| NCV78M08BDTRKG | Automotive-grade AEC-Q100 qualified; identical ±2% accuracy and DPAK-3 package; guaranteed −40°C to +125°C operation. | Required for safety-critical automotive body electronics (e.g., lighting control, seat modules); includes PPAP documentation support. | Choose for automotive production programs needing certified reliability and traceable qualification data. |
Compared with MC78M08CDTRKG, MC78M08ACTG offers tighter regulation for analog-sensitive systems; versus NCV78M08BDTRKG, it lacks AEC-Q100 certification but shares identical electrical specs and thermal performance-making it ideal for industrial applications demanding precision without automotive validation overhead.
Availability
MC78M08ACTG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical patient monitor front-ends, and point-of-sale terminal power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC78M08ACTG 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC78M00A series was designed specifically for robust local regulation in harsh environments-delivering precision, protection, and reliability without external components in space-constrained industrial and automotive applications.
FAQ
What is the output voltage tolerance of MC78M08ACTG over temperature?
The MC78M08ACTG guarantees ±2% output voltage accuracy at TJ = 25°C, with total variation across −40°C to +125°C remaining within ±4% (7.68 V to 8.32 V) per datasheet Section 3. This includes initial tolerance, line/load regulation, and temperature coefficient (±0.2 mV/°C). The MC78M08ACTG maintains this spec without external trimming components.
Can MC78M08ACTG replace MC78M08CTG in TO-220 package?
Yes, MC78M08ACTG can replace MC78M08CTG functionally and electrically, but not mechanically: both deliver 8.0 V ±2% at 500 mA with identical protection features, yet MC78M08ACTG uses DPAK-3 (surface-mount) while MC78M08CTG uses TO-220 (through-hole). PCB redesign is required; thermal design must account for DPAK-3's higher θJA (92°C/W vs. 70°C/W).
What is the minimum input voltage required for MC78M08ACTG to regulate at full 500 mA load?
The MC78M08ACTG requires a minimum input voltage of 10.0 V to maintain regulation at 500 mA load, based on its 2.0 V typical dropout voltage (VIN − VOUT). At 25°C junction temperature and 500 mA, VIN must exceed 10.0 V; derating is needed above 70°C ambient due to thermal limits. Input below 10.0 V causes dropout and unregulated output.
Does MC78M08ACTG require an input bypass capacitor?
Yes, MC78M08ACTG requires a minimum 0.33 µF low-ESR capacitor (tantalum, ceramic, or mylar) placed directly across Pins 1 and 2 (input-to-ground), with leads ≤5 mm long. This stabilizes the regulator under fast load transients and suppresses high-frequency noise from upstream switching converters-omitting it risks oscillation or erratic dropout behavior per datasheet Application Information section.
Is MC78M08ACTG pin-compatible with LM78M08?
No, MC78M08ACTG is not pin-compatible with LM78M08. While both are 8 V, 500 mA regulators, LM78M08 uses TO-220 (3-pin vertical) or TO-263 (D2PAK) packages with different pinouts and thermal pad configurations. MC78M08ACTG uses DPAK-3 (TO-252) with Pin 2 as Ground/thermal pad-direct substitution requires PCB layout change and thermal validation.
MC78M08ACTG 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:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC78M08ACTG FAQ
1.How can I place an order for MC78M08ACTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08ACTG 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 MC78M08ACTG reliable?
The price and inventory of MC78M08ACTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ACTG is usually 5 days.
3.What payment methods are accepted for MC78M08ACTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ACTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08ACTG?
MC78M08ACTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08ACTG 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 MC78M08ACTG?
For technical support, including MC78M08ACTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ACTG requirements.
6.How does Aetrix verify that MC78M08ACTG is sourced from the original manufacturer or authorized distributors?
All MC78M08ACTG 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 MC78M08ACTG meets industry standards.
7.What is the process for return or replacement of MC78M08ACTG?
All MC78M08ACTG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ACTG, 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 MC78M08ACTG part is unused and in its original packaging.
Return procedure for MC78M08ACTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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