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onsemi MC78M08ABDT
- Part No.:
- MC78M08ABDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M08ABDT.pdf
- Description:
- IC REG LINEAR 8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,239
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Product details
Overview
MC78M08ABDT 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 board-level regulation. It delivers stable 8 V to microcontrollers, sensors, and analog circuitry in industrial control panels and automotive body electronics.
For engineers reviewing the MC78M08ABDT datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −40°C to +125°C operating junction temperature, 2.0 V dropout voltage at 350 mA, 56 dB ripple rejection at 120 Hz/100 mA, and Pb-free DPAK-3 packaging with heatsink-connected ground terminal.
Technical Context
The MC78M08ABDT implements a monolithic three-terminal series pass architecture with built-in thermal overload protection and foldback current limiting. Its internal safe-area compensation dynamically reduces short-circuit current as input-to-output differential increases, preventing second breakdown during fault conditions.
Designed for fixed-voltage local regulation, it requires no external components for basic operation but benefits from a 0.33 µF input bypass capacitor when connected via long traces. Input voltage range is 10.5–23 Vdc for full-load operation, with peak output current capability of 700 mA under transient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.84–8.16 V at 25°C (±2% tolerance, high-accuracy A-grade variant) |
| Max Output Current | 500 mA continuous (with adequate PCB copper heatsinking) |
| Dropout Voltage | 2.0 V typical at 350 mA (dictates minimum VI = 10.0 V for stable 8 V output) |
| Ripple Rejection | 56 dB at 120 Hz / 100 mA (rejects line-frequency noise in AC/DC supplies) |
| Operating Temp | −40°C to +125°C junction (supports automotive under-hood and industrial environments) |
| Thermal Resistance | Junction-to-case = 5.0°C/W (enables direct heatsink mounting via Pin 2) |
| Short-Circuit Limit | 350 mA typical (foldback-limited to protect pass transistor during sustained faults) |
Pinout & Package
DPAK-3 (TO-252) package with exposed thermal pad connected internally to Pin 2 (Ground). Heatsink surface must be electrically tied to system ground for thermal performance and safety.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (10.5–23 V); requires 0.33 µF bypass capacitor near pin for stability |
| Pin 2 | Ground | Common reference and thermal path; heatsink surface is electrically connected to this pin |
| Pin 3 | Output | Regulated 8.0 V output; capable of sourcing up to 500 mA with proper thermal design |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation enables drop-in replacement in space-constrained designs without feedback network or compensation parts |
| ±2% output accuracy (A-grade) | Tighter tolerance than standard B/C variants ensures reliable logic-level compatibility for 8 V I/O rails |
| Internal thermal shutdown | Automatically disables output above +150°C junction temperature, preventing permanent damage during overload |
| Safe-area compensated pass transistor | Reduces short-circuit current as VI–VO increases, avoiding SOA violation during high-differential faults |
| Pb-free DPAK-3 package | RoHS-compliant 6.10 × 6.54 mm footprint with low thermal resistance (5.0°C/W JC) for cost-effective PCB heatsinking |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated 8 V analog sensor interfaces and digital I/O drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator providing clean, stable 8 V rail independent of main 24 V bus fluctuations. Use Value: ±2% accuracy ensures consistent ADC reference scaling; 56 dB ripple rejection suppresses switching noise from adjacent SMPS. | Use Scenario: Supplying 8 V to window lift motor controllers and door module microcontrollers in passenger vehicles. IC Role / Device Role / Timing Role: Primary 8 V regulator for non-safety-critical subsystems requiring −40°C to +125°C operation. Use Value: Thermal shutdown and short-circuit protection meet automotive reliability requirements; DPAK-3 footprint supports automated assembly. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
Use Scenario: Regulating power for precision front-end amplifiers and signal conditioning circuits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-noise 8 V source for op-amp biasing and reference generation. Use Value: 52 µVrms output noise (10 Hz–100 kHz) minimizes baseline drift; safe-area compensation prevents latch-up during ESD events. | Use Scenario: Providing regulated 8 V to display backlight drivers and secure element ICs in retail payment terminals. IC Role / Device Role / Timing Role: Secondary voltage rail derived from 12 V input, supporting mixed-signal peripherals. Use Value: 500 mA output sustains peak loads during EMV transaction processing; Pb-free DPAK-3 meets global compliance mandates. |
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 tolerance (C-grade), 0°C to +125°C temp range, same DPAK-3 package | Not qualified for automotive or extended industrial use; lower accuracy limits precision analog use | Select when cost sensitivity outweighs accuracy and temperature range requirements |
| NCV78M08BDTRKG | Identical electrical specs and −40°C to +125°C rating, but AEC-Q100 qualified and PPAP-capable | Required for automotive production programs needing certified supply chain traceability and failure mode analysis | Choose for OEM automotive designs where qualification documentation and process controls are mandatory |
Compared with MC78M08CDTRKG, the MC78M08ABDT offers tighter ±2% regulation and extended low-temp operation; versus NCV78M08BDTRKG, it lacks AEC-Q100 certification but shares identical performance-making it suitable for industrial and non-OEM automotive applications.
Availability
MC78M08ABDT is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical front-end modules, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC78M08ABDT 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 MC78M00A series-including MC78M08ABDT-is engineered for rugged, local voltage regulation in harsh environments, emphasizing thermal robustness, fault protection, and extended temperature operation without external support components.
FAQ
What is the guaranteed output voltage tolerance for MC78M08ABDT over temperature?
The MC78M08ABDT guarantees ±2% output voltage accuracy at TJ = 25°C. Over the full −40°C to +125°C junction temperature range, output variation remains within 7.6–8.4 V (±5% band) under specified load and line conditions per datasheet Section 3. This reflects the A-grade high-accuracy binning specific to MC78M08ABDT.
Can MC78M08ABDT be used without an input bypass capacitor?
MC78M08ABDT can operate without an input bypass capacitor in low-noise, low-impedance environments with short trace lengths. However, the datasheet recommends a minimum 0.33 µF tantalum or ceramic capacitor placed directly across Pins 1 and 2 to ensure stability under dynamic load changes and suppress high-frequency ringing-especially when sourced from switch-mode supplies or long cables.
What is the maximum allowable input voltage for MC78M08ABDT?
The absolute maximum input voltage for MC78M08ABDT is 40 Vdc, as specified in the Maximum Ratings table. For reliable continuous operation at 500 mA output, the recommended input range is 10.5–23 Vdc. Exceeding 23 Vdc increases power dissipation and thermal stress, requiring derating per the thermal resistance curves in Figure 3 of the datasheet.
How does the thermal shutdown feature behave in MC78M08ABDT?
MC78M08ABDT activates thermal shutdown when junction temperature exceeds +150°C, disabling the output until the die cools below the hysteresis threshold (~135°C). During shutdown, quiescent current drops to ~3.2 mA, and the device automatically recovers without external intervention-providing fail-safe protection against sustained overload or inadequate heatsinking.
Is MC78M08ABDT pin-compatible with other regulators in the MC78Mxx family?
Yes-MC78M08ABDT uses the standard DPAK-3 (TO-252) 3-pin configuration shared across the MC78Mxx series: Pin 1 = Input, Pin 2 = Ground (heatsink), Pin 3 = Output. Voltage variants (e.g., MC78M05ABDT, MC78M12ABDT) are mechanically and electrically pin-compatible, enabling board-level voltage scalability with only BOM and routing changes.
MC78M08ABDT 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC78M08ABDT FAQ
1.How can I place an order for MC78M08ABDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M08ABDT 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 MC78M08ABDT reliable?
The price and inventory of MC78M08ABDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ABDT is usually 5 days.
3.What payment methods are accepted for MC78M08ABDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ABDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M08ABDT?
MC78M08ABDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M08ABDT 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 MC78M08ABDT?
For technical support, including MC78M08ABDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ABDT requirements.
6.How does Aetrix verify that MC78M08ABDT is sourced from the original manufacturer or authorized distributors?
All MC78M08ABDT 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 MC78M08ABDT meets industry standards.
7.What is the process for return or replacement of MC78M08ABDT?
All MC78M08ABDT units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ABDT, 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 MC78M08ABDT part is unused and in its original packaging.
Return procedure for MC78M08ABDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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