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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi MC78M08ACDTRKG

Name: MC78M08ACDTRKG
Brand: onsemi
SKU: MC78M08ACDTRKG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC78M08ACDTRKG

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: MC78M08ACDTRKG.pdf

Description:: IC REG LINEAR 8V 500MA DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MC78M08ACDTRKG 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 to microcontrollers, sensors, and analog circuitry in industrial power supplies and automotive ECUs.

For engineers reviewing the MC78M08ACDTRKG datasheet, pinout, applications, or equivalent options, key selection criteria include output tolerance (±2%), dropout voltage (2.0 V), ripple rejection (56 dB @ 120 Hz), thermal protection behavior, and DPAK-3 thermal resistance (θ_JA = 92°C/W, θ_JC = 5.0°C/W).

Technical Context

The MC78M08ACDTRKG implements a monolithic series pass transistor with integrated current limiting, thermal overload protection, and safe-area compensation-ensuring reliable operation under transient overloads and elevated ambient temperatures. Its architecture requires no external components for basic regulation but benefits from input bypassing (≥0.33 µF) when connected via long traces.

It operates across an input voltage range of 10.5–25 V DC, maintains load regulation of ≤25 mV (5–500 mA), and exhibits line regulation of ≤6.0 mV over its specified input range. Output noise is 52 µV_RMS (10 Hz–100 kHz), and peak output current capability reaches 700 mA at 25°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	8.0 V nominal, ±2% tolerance at 25°C - ensures precise biasing for 8 V logic or analog rails without trimming.
Max Output Current	500 mA continuous - supports mid-power subsystems like MCU cores, op-amp stages, or sensor signal chains.
Dropout Voltage	2.0 V typical at 350 mA - mandates minimum 10 V input for stable 8 V output; impacts low-input-voltage headroom design.
Ripple Rejection	56 dB @ 120 Hz, 100 mA load - suppresses rectified AC ripple from unregulated supplies feeding downstream analog circuits.
Thermal Shutdown	Active at +150°C junction - prevents permanent damage during sustained overload or inadequate heatsinking.
Quiescent Current	3.2 mA typical - contributes <0.026 W loss at 8 V output, critical for low-power standby modes.
Operating Temp Range	0°C to +125°C - qualified for commercial/industrial environments, excluding extended automotive (-40°C) grade.

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 surface-mount PCBs with moderate power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1	Input	Unregulated DC input (10.5–25 V); must be bypassed locally with ≥0.33 µF capacitor for stability.
2	Ground	Common reference and thermal path; electrically tied to exposed pad - requires solid copper pour for thermal performance.
3	Output	Regulated 8.0 V output; capable of sourcing up to 500 mA with proper thermal management.

Key Features

Feature	Design Value
No external components required	Self-contained regulation enables minimal BOM count and layout simplicity for point-of-load applications.
±2% output accuracy (MC78M08A variant)	Tighter tolerance than standard MC78M08C (±3%) - reduces need for post-regulation trimming in precision analog systems.
Internal short-circuit current limit	350 mA typical limit protects device and upstream supply during output faults without external foldback circuitry.
Safe-area compensated pass transistor	Prevents secondary breakdown under high V_CE/I_C stress - enhances reliability in dynamic load or thermal cycling conditions.
Pb-free, RoHS-compliant packaging	DPAK-3 with "G" suffix meets environmental compliance requirements for global industrial and automotive manufacturing.

Applications

Industrial PLC I/O Modules	Automotive Body Control Units
Use Scenario: Powering isolated digital input buffers and relay drivers in modular PLC backplanes with 12–24 V bus input. IC Role / Device Role: Local 8 V rail generation for optocoupler LEDs and level-shifting logic. Use Value: Eliminates need for external feedback resistors or compensation networks while maintaining ±2% output stability across 0–70°C operating range.	Use Scenario: Supplying 8 V to LIN transceivers and window motor control ICs in door modules. IC Role / Device Role: Secondary regulated supply derived from vehicle battery (12 V nominal) after primary DC-DC conversion. Use Value: Internal thermal shutdown prevents latch-up during load dump events; 56 dB ripple rejection suppresses alternator noise coupling into communication lines.
Medical Patient Monitor Sensors	Test & Measurement Signal Conditioning
Use Scenario: Biasing low-noise instrumentation amplifiers and thermistor front-ends in portable vital sign monitors. IC Role / Device Role: Clean, low-drift 8 V analog supply for precision ADC reference and op-amp rails. Use Value: 52 µV_RMS output noise and ±0.2 mV/°C tempco ensure sub-LSB error contribution in 16-bit measurement systems.	Use Scenario: Providing stable 8 V excitation for strain gauge bridges and RTD interfaces in benchtop calibrators. IC Role / Device Role: Fixed-voltage excitation source with minimal line/load regulation drift. Use Value: Load regulation ≤25 mV over 5–500 mA enables consistent bridge bias across varying sensor impedances without recalibration.

Industrial PLC I/O Modules

Automotive Body Control Units

Use Scenario: Powering isolated digital input buffers and relay drivers in modular PLC backplanes with 12–24 V bus input.

IC Role / Device Role: Local 8 V rail generation for optocoupler LEDs and level-shifting logic.

Use Value: Eliminates need for external feedback resistors or compensation networks while maintaining ±2% output stability across 0–70°C operating range.

Use Scenario: Supplying 8 V to LIN transceivers and window motor control ICs in door modules.

IC Role / Device Role: Secondary regulated supply derived from vehicle battery (12 V nominal) after primary DC-DC conversion.

Use Value: Internal thermal shutdown prevents latch-up during load dump events; 56 dB ripple rejection suppresses alternator noise coupling into communication lines.

Medical Patient Monitor Sensors

Test & Measurement Signal Conditioning

Use Scenario: Biasing low-noise instrumentation amplifiers and thermistor front-ends in portable vital sign monitors.

IC Role / Device Role: Clean, low-drift 8 V analog supply for precision ADC reference and op-amp rails.

Use Value: 52 µV_RMS output noise and ±0.2 mV/°C tempco ensure sub-LSB error contribution in 16-bit measurement systems.

Use Scenario: Providing stable 8 V excitation for strain gauge bridges and RTD interfaces in benchtop calibrators.

IC Role / Device Role: Fixed-voltage excitation source with minimal line/load regulation drift.

Use Value: Load regulation ≤25 mV over 5–500 mA enables consistent bridge bias across varying sensor impedances without recalibration.

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 tolerance (vs. ±2% for MC78M08ACDTRKG); otherwise identical electrical specs and package.	Suitable where tighter initial accuracy is not required - e.g., non-critical digital logic rails.	Select MC78M08CDTRKG for cost-sensitive designs accepting wider output variation.
LM2940CT-8.0/NOPB	Lower dropout (0.5 V typ.), higher quiescent current (10 mA), TO-220 package, 100 mA max output.	Better suited for low-input-headroom applications but limited to lower current and larger footprint.	Choose LM2940CT-8.0/NOPB only when input voltage is constrained near 8.5 V and 100 mA suffices.

Compared with MC78M08CDTRKG, the MC78M08ACDTRKG offers superior initial accuracy for precision analog use; versus LM2940CT-8.0/NOPB, it delivers 5× higher output current in a smaller DPAK-3 package but requires greater input-to-output differential voltage.

Availability

MC78M08ACDTRKG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor subsystems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MC78M08ACDTRKG 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 manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC78M00A series was designed specifically for robust, low-cost local voltage regulation in space-constrained industrial and automotive control modules-emphasizing fault resilience and ease of integration without external compensation.

FAQ

What is the guaranteed output voltage tolerance for MC78M08ACDTRKG over temperature?

The MC78M08ACDTRKG guarantees ±2% output voltage tolerance at T_J = 25°C. Over the full operating junction temperature range (0°C to +125°C), output voltage variation remains within ±3% (7.76 V to 8.24 V) per the datasheet's "Output Voltage Variation" specification for the MC78M08AB/MC78M08AC variants. This includes effects of line, load, and temperature drift.

Can MC78M08ACDTRKG operate with an input voltage of 9.5 V?

No - the MC78M08ACDTRKG requires a minimum input voltage of 10.5 V to maintain regulation, as specified in its "Electrical Characteristics" table (VI range: 10.5–23 V for output voltage variation testing). At 9.5 V input, dropout exceeds the 2.0 V typical, causing output collapse below 8 V and potential instability.

Is a heat sink required for MC78M08ACDTRKG delivering 500 mA continuously?

Yes - at 500 mA output with 12 V input (4 V dropout), power dissipation is ~2.0 W. With θ_JA = 92°C/W in free air, junction temperature rise would exceed 184°C - far above the +150°C absolute maximum. A minimum 25 mm² copper pour (2 oz) is required; for sustained 500 mA, a small clip-on heatsink or thermal vias to inner layers are strongly recommended.

Does MC78M08ACDTRKG support reverse-polarity input protection?

No - the MC78M08ACDTRKG lacks built-in reverse-polarity protection. Applying negative voltage to pin 1 (Input) relative to pin 2 (GND) can cause irreversible damage. External protection (e.g., series Schottky diode or PMOS FET) must be added if reverse input is possible in the system.

What is the purpose of the exposed thermal pad on the DPAK-3 package of MC78M08ACDTRKG?

The exposed thermal pad on the MC78M08ACDTRKG's DPAK-3 package is electrically connected to pin 2 (GND) and serves as the primary thermal conduction path from the silicon die to the PCB. Soldering this pad to a large copper area significantly lowers θ_JA, enabling higher continuous current capability and improved reliability under thermal stress.

MC78M08ACDTRKG 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

MC78M08ACDTRKG FAQ

1.How can I place an order for MC78M08ACDTRKG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC78M08ACDTRKG 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 MC78M08ACDTRKG reliable?

The price and inventory of MC78M08ACDTRKG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M08ACDTRKG is usually 5 days.

3.What payment methods are accepted for MC78M08ACDTRKG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M08ACDTRKG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC78M08ACDTRKG?

MC78M08ACDTRKG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC78M08ACDTRKG 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 MC78M08ACDTRKG?

For technical support, including MC78M08ACDTRKG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M08ACDTRKG requirements.

6.How does Aetrix verify that MC78M08ACDTRKG is sourced from the original manufacturer or authorized distributors?

All MC78M08ACDTRKG 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 MC78M08ACDTRKG meets industry standards.

7.What is the process for return or replacement of MC78M08ACDTRKG?

All MC78M08ACDTRKG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M08ACDTRKG, 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 MC78M08ACDTRKG part is unused and in its original packaging.

Return procedure for MC78M08ACDTRKG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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