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

onsemi MC78M15CDTT5G

Name: MC78M15CDTT5G
Brand: onsemi
SKU: MC78M15CDTT5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC78M15CDTT5G

Manufacturer:: onsemi

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

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

Datasheet:: MC78M15CDTT5G.pdf

Description:: IC REG LINEAR 15V 500MA DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:1,942

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Product details

Overview

MC78M15CDTT5G from onsemi is a 500 mA, 15 V fixed-output linear voltage regulator in DPAK-3 (TO-252) package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local regulation. It delivers stable 15 V output across 5–500 mA load with ±3% initial accuracy (14.4–15.6 V at 25°C), 2.0 V dropout, and 54 dB ripple rejection at 100 mA/120 Hz - ideal for industrial power supplies and embedded control rails.

For engineers reviewing the MC78M15CDTT5G datasheet, pinout, applications, or equivalent options, key selection criteria include its 15 V fixed output, 500 mA continuous current capability, DPAK-3 thermal performance (θ_JA = 92°C/W), −40°C to +125°C operating range, and Pb-free RoHS-compliant packaging.

Technical Context

This three-terminal positive regulator uses a monolithic pass transistor with integrated safe-area compensation to maintain reliability under overload and high-V_IN−V_OUT conditions. Its internal current limit holds peak output at 350 mA during short-circuit events, while thermal shutdown activates above +150°C junction temperature.

The device operates without external components but benefits from input bypassing (≥0.33 µF) for stability with long trace lengths or large capacitive loads. Dropout voltage remains fixed at 2.0 V across temperature and load, enabling predictable minimum input requirements (≥17 V for full 15 V output).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	15 V nominal; 14.4–15.6 V over temperature and line/load (ensures compatible logic or analog supply margin)
Max Output Current	500 mA continuous; 700 mA peak (supports transient loads without regulation loss)
Dropout Voltage	2.0 V typical at 25°C (dictates minimum input: ≥17 V for full 15 V output)
Ripple Rejection	54 dB at 100 mA / 120 Hz (attenuates rectified AC noise by >5×)
Thermal Resistance	θ_JA = 92°C/W (requires PCB copper area ≥20 mm² for 500 mA at 50°C ambient)
Operating Range	−40°C to +125°C junction (validates use in automotive engine bay or industrial enclosures)
Short-Circuit Limit	350 mA typical (prevents catastrophic failure during fault conditions)

Pinout & Package

DPAK-3 (TO-252) package with exposed thermal pad connected to Pin 2 (GND); heatsink surface electrically tied to ground for optimal thermal transfer and EMI control.

Pin/Terminal	Circuit Role	Design Meaning
1	Input	Unregulated DC input (35 V max); requires ≥0.33 µF bypass capacitor near pin for stability
2	Ground	Common reference and thermal path; connects to exposed pad and PCB ground plane
3	Output	Regulated 15 V output; drives load directly with ≤300 mV load regulation (5–500 mA)

Key Features

Feature	Design Value
No external components required	Self-contained regulation enables minimal BOM count and board space in point-of-load designs
Internal thermal shutdown	Automatically disables output above +150°C junction, preventing permanent damage during overload
Safe-area compensated pass transistor	Reduces short-circuit current as V_IN−V_OUT increases, enhancing reliability under high-dissipation faults
Pb-free and RoHS compliant	Meets global environmental directives without compromising thermal or electrical performance
−40°C to +125°C operation	Validated for automotive under-hood and industrial control applications without derating

Applications

Industrial PLC I/O Module Power	Automotive Body Control Unit (BCU)
Use Scenario: Providing clean 15 V rail to analog sensor interfaces and relay drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Local voltage regulation for isolated analog front-ends and discrete output stages. Use Value: 54 dB ripple rejection suppresses switching noise from adjacent DC-DC converters, preserving ADC accuracy.	Use Scenario: Supplying 15 V to window lift motor drivers and door lock actuators in vehicle body electronics. IC Role / Device Role / Timing Role: Primary 15 V regulator for non-safety-critical 12 V system derivatives. Use Value: −40°C to +125°C rating ensures reliable operation across full automotive temperature range without external thermal management.
Test Equipment Front-End Supply	Legacy Industrial Instrumentation
Use Scenario: Generating stable 15 V for op-amp biasing and DAC reference circuits in benchtop signal generators. IC Role / Device Role / Timing Role: Low-noise analog supply rail with <90 µV_RMS output noise. Use Value: 90 µV_RMS noise (10 Hz–100 kHz) minimizes spurious tones in precision waveform generation.	Use Scenario: Replacing aging 7815 regulators in legacy panel meters and process controllers requiring drop-in compatibility. IC Role / Device Role / Timing Role: Direct functional replacement for through-hole 7815 with surface-mount DPAK footprint. Use Value: Identical 15 V output and pinout (Input-GND-Output) enables direct PCB redesign with no schematic change.

Industrial PLC I/O Module Power

Automotive Body Control Unit (BCU)

Use Scenario: Providing clean 15 V rail to analog sensor interfaces and relay drivers in programmable logic controllers.

IC Role / Device Role / Timing Role: Local voltage regulation for isolated analog front-ends and discrete output stages.

Use Value: 54 dB ripple rejection suppresses switching noise from adjacent DC-DC converters, preserving ADC accuracy.

Use Scenario: Supplying 15 V to window lift motor drivers and door lock actuators in vehicle body electronics.

IC Role / Device Role / Timing Role: Primary 15 V regulator for non-safety-critical 12 V system derivatives.

Use Value: −40°C to +125°C rating ensures reliable operation across full automotive temperature range without external thermal management.

Test Equipment Front-End Supply

Legacy Industrial Instrumentation

Use Scenario: Generating stable 15 V for op-amp biasing and DAC reference circuits in benchtop signal generators.

IC Role / Device Role / Timing Role: Low-noise analog supply rail with <90 µV_RMS output noise.

Use Value: 90 µV_RMS noise (10 Hz–100 kHz) minimizes spurious tones in precision waveform generation.

Use Scenario: Replacing aging 7815 regulators in legacy panel meters and process controllers requiring drop-in compatibility.

IC Role / Device Role / Timing Role: Direct functional replacement for through-hole 7815 with surface-mount DPAK footprint.

Use Value: Identical 15 V output and pinout (Input-GND-Output) enables direct PCB redesign with no schematic change.

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC7815CDTG	TO-220 package; θ_JA = 70°C/W; same 15 V output and 500 mA rating	Better thermal performance with heatsink; larger footprint unsuitable for dense SMT layouts	Select when higher power dissipation (>1.5 W) or mechanical mounting is required
LM78M15CDT	Same DPAK-3 package; ±4% output tolerance (14.4–15.6 V); identical pinout and specs	TI-sourced alternative with identical thermal and electrical behavior	Choose for dual-sourcing or TI-aligned BOMs without design revalidation

Compared with MC7815CDTG and LM78M15CDT, MC78M15CDTT5G offers optimized SMT manufacturability in DPAK-3 with verified −40°C to +125°C operation, making it preferred for compact, thermally constrained industrial and automotive modules where TO-220 mounting or alternate vendor qualification is not required.

Availability

MC78M15CDTT5G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, test equipment power supplies, and legacy instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MC78M15CDTT5G 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 for automotive, industrial, cloud, and IoT applications.

The MC78Mxx series was designed as a robust, low-cost fixed-output linear regulator family for local voltage regulation in cost-sensitive and thermally demanding environments - delivering reliability without external components.

FAQ

What is the maximum input voltage rating for MC78M15CDTT5G?

The MC78M15CDTT5G supports a maximum input voltage of 35 V DC under normal operating conditions. This rating applies across the full −40°C to +125°C junction temperature range and ensures safe operation with transient spikes up to this level when properly heatsinked. Exceeding 35 V risks permanent damage due to internal breakdown.

Does MC78M15CDTT5G require an input bypass capacitor?

Yes, MC78M15CDTT5G requires a minimum 0.33 µF input bypass capacitor placed directly across Pins 1 and 2. This capacitor stabilizes regulation under dynamic load changes and suppresses high-frequency noise from upstream sources. Tantalum, ceramic, or low-ESR polymer types are recommended, with leads kept as short as possible to minimize inductance.

What is the thermal resistance (θ_JA) of MC78M15CDTT5G in standard PCB layout?

The MC78M15CDTT5G has a junction-to-air thermal resistance (θ_JA) of 92°C/W when mounted on a standard FR-4 PCB with minimal copper (1 in²). With 2 in² of 2 oz. copper connected to the exposed thermal pad, θ_JA improves to approximately 50°C/W - enabling 500 mA operation at up to 50°C ambient without forced airflow.

Can MC78M15CDTT5G be used in automotive applications?

Yes, MC78M15CDTT5G is qualified for automotive use with guaranteed operation from −40°C to +125°C junction temperature and Pb-free RoHS compliance. While not AEC-Q100 certified (that requires NCV78M15 variants), its robust thermal shutdown and safe-area compensation make it suitable for non-safety-critical automotive subsystems like interior lighting controls and HVAC actuators.

What is the output voltage tolerance of MC78M15CDTT5G over temperature and load?

The MC78M15CDTT5G exhibits an output voltage tolerance of ±3% (14.4–15.6 V) over full operating conditions: −40°C to +125°C junction temperature, 5–500 mA load, and 17.5–30 V input. At 25°C and 350 mA, typical output is 14.7–15.3 V, meeting industrial-grade precision requirements without trimming.

MC78M15CDTT5G 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):: 15V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 500mA

Current - Quiescent (Iq):: -

Current - Supply (Max):: -

PSRR:: 70dB (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

MC78M15CDTT5G FAQ

1.How can I place an order for MC78M15CDTT5G through Aetrix?

Please submit a Request for Quotation (RFQ) for MC78M15CDTT5G 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 MC78M15CDTT5G reliable?

The price and inventory of MC78M15CDTT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M15CDTT5G is usually 5 days.

3.What payment methods are accepted for MC78M15CDTT5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M15CDTT5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC78M15CDTT5G?

MC78M15CDTT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC78M15CDTT5G 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 MC78M15CDTT5G?

For technical support, including MC78M15CDTT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M15CDTT5G requirements.

6.How does Aetrix verify that MC78M15CDTT5G is sourced from the original manufacturer or authorized distributors?

All MC78M15CDTT5G 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 MC78M15CDTT5G meets industry standards.

7.What is the process for return or replacement of MC78M15CDTT5G?

All MC78M15CDTT5G units undergo pre-shipment inspection (PSI). If there is an issue with MC78M15CDTT5G, 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 MC78M15CDTT5G part is unused and in its original packaging.

Return procedure for MC78M15CDTT5G:

1.Submit a request within 90 days.

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

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