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onsemi MC78M05CDTT5
- Part No.:
- MC78M05CDTT5
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M05CDTT5.pdf
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
MC78M05CDTT5 from onsemi is a 5.0 V, 500 mA fixed-output linear voltage regulator in DPAK-3 (TO-252) package with ±2% output accuracy, thermal shutdown, and internal short-circuit current limiting. It delivers stable local regulation for microcontroller power rails, sensor interfaces, and industrial control modules requiring low-noise, robust DC supply.
For engineers reviewing the MC78M05CDTT5 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2.0 V), ripple rejection (62 dB at 120 Hz), load regulation (20 mV over 5–500 mA), and automotive-grade temperature range (−40°C to +125°C).
Technical Context
The MC78M05CDTT5 employs a monolithic bipolar pass transistor with safe-area compensation and integrated thermal overload protection. Its architecture includes internal current limiting and output transistor safe-area compensation to maintain reliability under transient overloads and short-circuit conditions without external components.
It operates as a three-terminal fixed-voltage regulator with input-to-ground and output-to-ground topology. The device requires no external capacitors for basic stability but benefits from a 0.33 µF input bypass capacitor when connected via long traces or driving large capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% (guaranteed over full temperature and load range) |
| Max Output Current | 500 mA continuous (with adequate heatsinking on PCB copper) |
| Dropout Voltage | 2.0 V typical (VI − VO at 25°C, enabling operation with VI ≥ 7.0 V) |
| Ripple Rejection | 62 dB at 120 Hz, 100 mA load (rejects AC line noise in SMPS-derived supplies) |
| Load Regulation | 20 mV max (ΔVO from 5 mA to 500 mA output current) |
| Thermal Shutdown | Active at TJ ≥ +150°C (self-protecting during sustained overload) |
| Quiescent Current | 3.2 mA typical (low standby power for battery-backed systems) |
Pinout & Package
DPAK-3 (TO-252) package with exposed thermal pad (pin 2 connected to ground). Pin 1: Input; Pin 2: Ground (and thermal tab); Pin 3: Output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (VI = 7–35 V); must be bypassed with ≥0.33 µF capacitor near pin |
| Pin 2 | Ground / Thermal Tab | Common reference and primary heat path; must be soldered to ≥1 cm² copper pour for 500 mA operation |
| Pin 3 | Output | Regulated 5.0 V output; capable of sourcing up to 500 mA with <20 mV load variation |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with internal bias, current limit, and thermal protection - reduces BOM count and layout complexity |
| ±2% output voltage accuracy | Meets tight tolerance requirements for MCU core logic, ADC references, and precision analog circuitry |
| Internal short-circuit current limiting | Limits peak output current to ~350 mA during fault, preventing damage to regulator or upstream supply |
| Safe-area compensated pass transistor | Prevents second breakdown during high-VCE/IC transients - enables reliable operation across wide input/output differentials |
| Pb-free, RoHS-compliant packaging | DPAK-3 (Case 369C) meets global environmental compliance standards without lead content or exemptions |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor signal conditioning circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local 5 V rail generator for microcontroller peripherals and optocoupler interfaces. Use Value: Maintains 5.0 V ±2% under 5–500 mA load steps and 7–24 V input variation, ensuring deterministic logic timing and ADC reference stability. | Use Scenario: Supplying 5 V to door module microcontrollers, window motor drivers, and LED status indicators. IC Role / Device Role / Timing Role: Primary 5 V regulator for non-safety-critical subsystems meeting AEC-Q100 Grade 3 (−40°C to +125°C). Use Value: Withstands automotive load dump (up to 35 V input) and provides thermal shutdown during sustained short-circuit faults. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
Use Scenario: Generating clean 5 V for ECG amplifier stages, display backlight drivers, and touch controller ICs. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling switching supply ripple before sensitive analog front-end stages. Use Value: 40 µVRMS output noise and 62 dB ripple rejection suppress 120 Hz hum from off-line SMPS, preserving signal integrity. | Use Scenario: Providing regulated 5 V to embedded payment processor, thermal printer head, and USB peripheral interface. IC Role / Device Role / Timing Role: Main system regulator supporting burst-mode 500 mA loads during print or card swipe operations. Use Value: Peak output current capability of 700 mA handles transient printer head activation without brownout or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M05BDTRKG | Same DPAK-3 package, −40°C to +125°C operating range (vs. 0°C to +125°C for MC78M05CDTT5) | Required for extended temperature environments (e.g., under-hood automotive, outdoor industrial) | Select MC78M05BDTRKG when operation below 0°C is needed; otherwise MC78M05CDTT5 suffices for commercial/industrial ambient |
| NCV78M05ABDTRKG | AEC-Q100 qualified, PPAP-capable, −40°C to +125°C, tighter initial accuracy (±2% over full range) | Mandatory for automotive OEM production; supports PPAP documentation and traceability | Choose NCV78M05ABDTRKG only for certified automotive programs; MC78M05CDTT5 is cost-optimized for non-automotive use |
Compared with MC78M05BDTRKG and NCV78M05ABDTRKG, the MC78M05CDTT5 offers identical electrical performance at 0°C to +125°C but lower qualification overhead and cost - ideal for industrial and consumer designs where extended temperature or automotive certification is unnecessary.
Availability
MC78M05CDTT5 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and point-of-sale terminals requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MC78M05CDTT5 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 MC78M00 series was designed as a rugged, drop-in replacement for legacy 78xx regulators - delivering enhanced thermal protection, tighter tolerances, and Pb-free packaging for modern industrial and automotive electronics.
FAQ
What is the maximum input voltage rating for MC78M05CDTT5?
The MC78M05CDTT5 has an absolute maximum input voltage of 35 V DC. Operation above this level risks permanent damage. For reliable 500 mA output, the recommended input range is 7.0 V to 24 V to maintain sufficient dropout margin and minimize thermal dissipation.
Does MC78M05CDTT5 require an input bypass capacitor?
Yes - a minimum 0.33 µF tantalum or ceramic capacitor is recommended directly across the input pins of MC78M05CDTT5. This stabilizes operation under high-frequency noise and long-trace conditions, preventing oscillation and ensuring consistent regulation during load transients.
Can MC78M05CDTT5 be used in automotive applications?
The MC78M05CDTT5 is rated for 0°C to +125°C junction temperature and meets industrial reliability standards, but it is not AEC-Q100 qualified. For production automotive use, select the NCV78M05ABDTRKG variant instead - it carries full automotive qualification and PPAP support.
What is the thermal resistance (θJA) of MC78M05CDTT5 in standard PCB layout?
In a standard 1 oz. copper PCB with 1 cm² thermal pad, the MC78M05CDTT5 exhibits θJA ≈ 92°C/W. With 2 oz. copper and 2 cm² pad, θJA improves to ~50°C/W - enabling full 500 mA output at ambient temperatures up to 70°C without forced air cooling.
How does MC78M05CDTT5 handle short-circuit conditions?
The MC78M05CDTT5 features internal short-circuit current limiting that caps output current at ~350 mA during fault. Combined with thermal shutdown at +150°C junction temperature, this dual protection prevents destruction during sustained shorts while allowing automatic recovery once the fault clears and temperature drops.
MC78M05CDTT5 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):
- 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
MC78M05CDTT5 FAQ
1.How can I place an order for MC78M05CDTT5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M05CDTT5 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 MC78M05CDTT5 reliable?
The price and inventory of MC78M05CDTT5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M05CDTT5 is usually 5 days.
3.What payment methods are accepted for MC78M05CDTT5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M05CDTT5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M05CDTT5?
MC78M05CDTT5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M05CDTT5 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 MC78M05CDTT5?
For technical support, including MC78M05CDTT5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M05CDTT5 requirements.
6.How does Aetrix verify that MC78M05CDTT5 is sourced from the original manufacturer or authorized distributors?
All MC78M05CDTT5 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 MC78M05CDTT5 meets industry standards.
7.What is the process for return or replacement of MC78M05CDTT5?
All MC78M05CDTT5 units undergo pre-shipment inspection (PSI). If there is an issue with MC78M05CDTT5, 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 MC78M05CDTT5 part is unused and in its original packaging.
Return procedure for MC78M05CDTT5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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