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onsemi MC78M09CDTG
- Part No.:
- MC78M09CDTG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M09CDTG.pdf
- Description:
- IC REG LINEAR 9V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
MC78M09CDTG from onsemi is a 500 mA, fixed +9.0 V positive 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 output under load currents up to 500 mA with dropout voltage ≤2.0 V and ripple rejection ≥56 dB at 120 Hz, commonly used in industrial power supplies and embedded control modules.
For engineers reviewing the MC78M09CDTG datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±5% over temperature), thermal resistance (θJA = 92°C/W, θJC = 5.0°C/W), input voltage range (11.5–23 V), and Pb-free DPAK-3 packaging suitable for reflow assembly.
Technical Context
The MC78M09CDTG implements a monolithic series pass transistor architecture with built-in protection circuitry: thermal overload shutdown activates at ~150°C junction temperature, and short-circuit current limiting holds peak output current to 350 mA under fault conditions. Safe-area compensation dynamically reduces short-circuit current as input-output differential increases, preventing secondary breakdown.
It operates across 0°C to +125°C junction temperature range with no external components required for basic regulation. Load regulation is 25 mV (5–500 mA) and line regulation is 6.0 mV (11.5–25 V), confirming stability in varying input and load conditions typical of 12 V rail-derived subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V nominal, ±5% variation (8.55–9.45 V) over full load and input range - ensures compatibility with 9 V logic or analog rails. |
| Max Output Current | 500 mA continuous, 700 mA peak - supports moderate-power microcontrollers, sensors, and interface ICs without heatsinking. |
| Dropout Voltage | ≤2.0 V at 350 mA - enables operation from 11.5 V minimum input, compatible with automotive or industrial 12 V systems. |
| Ripple Rejection | ≥56 dB at 120 Hz (100 mA load) - suppresses rectified AC noise in linear supply front-ends. |
| Thermal Resistance | θJA = 92°C/W, θJC = 5.0°C/W - defines PCB copper area requirements for thermal management in DPAK-3 layout. |
| Quiescent Current | 3.2–6.0 mA - low standby draw suitable for battery-backed or always-on subsystems. |
| Operating Temp | 0°C to +125°C junction - qualified for commercial/industrial environments, not automotive-grade (NCV variant required). |
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 thermal performance on 2 oz. copper PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input (11.5–23 V); requires ≥0.33 µF bypass capacitor near pin for high-frequency stability. |
| 2 | GND | Ground reference and thermal pad connection; must be soldered to large copper pour for thermal dissipation. |
| 3 | Output | Regulated +9.0 V output; capable of sourcing 500 mA continuously with <25 mV load regulation error. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with integrated pass transistor and feedback - eliminates need for external resistors or capacitors in basic configurations. |
| Internal thermal shutdown | Automatic disable above ~150°C junction temperature - prevents damage during overload or poor heatsinking. |
| Short-circuit current limiting | Clamps output to ≤350 mA during hard shorts - protects both regulator and downstream circuitry without fuse reliance. |
| Safe-area compensation | Reduces short-circuit current as VI–VO increases - avoids second breakdown in high-differential-voltage fault conditions. |
| Pb-free DPAK-3 package | RoHS-compliant TO-252 outline with gull-wing leads - supports lead-free reflow and automated optical inspection (AOI). |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
Use Scenario: Local regulation of 9 V supply for digital I/O drivers and analog sensor interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 500 mA voltage regulator providing clean, stable 9 V to isolated field-side circuitry. Use Value: Internal protection features eliminate need for external fuses or thermal sensors, reducing BOM count and board space. | Use Scenario: Powering 9 V-tolerant microcontrollers (e.g., certain PIC or STM32 variants) and peripheral ICs in compact edge devices. IC Role / Device Role / Timing Role: On-board linear regulator delivering low-noise 9 V from higher-voltage system rails (e.g., 12 V or 24 V). Use Value: 56 dB ripple rejection and 40 µV RMS output noise ensure reliable ADC reference and analog signal integrity. |
| Test & Measurement Equipment | Point-of-Load Regulation in Industrial Sensors |
Use Scenario: Stable bias supply for op-amps and precision references in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-drift, low-noise 9 V source supporting 16-bit+ measurement accuracy. Use Value: ±0.2 mV/°C temperature coefficient minimizes drift-induced errors across operating temperature range. | Use Scenario: Dedicated 9 V rail for MEMS pressure sensors and signal-conditioning ASICs in factory-floor transmitters. IC Role / Device Role / Timing Role: Local regulator placed adjacent to sensor IC to minimize IR drop and noise coupling. Use Value: DPAK-3 thermal pad enables direct mounting to metal chassis or heat-spreading copper, maintaining <125°C junction at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78M09BDTRKG | Wider temperature range (−40°C to +125°C) and same DPAK-3 package; otherwise identical electrical specs. | Suitable for extended-temperature industrial or outdoor deployments where cold-start reliability is critical. | Select MC78M09BDTRKG when ambient operating temperature may fall below 0°C. |
| LM2940CT-9.0/NOPB | Lower dropout (0.5 V typical), higher quiescent current (10 mA), and TO-220 package; 500 mA rated. | Better suited for low-input-voltage applications (e.g., 9.5 V input), but requires larger footprint and different thermal design. | Choose LM2940CT-9.0/NOPB only if input voltage margin is <2 V and TO-220 mounting is acceptable. |
Compared with MC78M09BDTRKG, the MC78M09CDTG offers lower cost and sufficient performance for 0°C–125°C commercial/industrial use; versus LM2940CT-9.0/NOPB, it trades higher dropout for smaller DPAK-3 size and lower quiescent current, favoring space-constrained designs with adequate input headroom.
Availability
MC78M09CDTG is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test equipment requiring stable component supply with RoHS-compliant packaging and consistent parametric performance.
Supply support for MC78M09CDTG 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 MC78Mxx series was designed as a robust, drop-in replacement for legacy 78xx regulators, targeting cost-sensitive industrial and commercial applications where reliability, thermal resilience, and simplified design are prioritized over ultra-low dropout or ultra-low IQ.
FAQ
What is the maximum input voltage rating for the MC78M09CDTG?
The MC78M09CDTG has an absolute maximum input voltage of 35 V DC. However, for reliable operation within specifications, the recommended input range is 11.5 V to 23 V DC - this ensures proper regulation, thermal safety, and ripple rejection performance per the datasheet's electrical characteristics table.
Does the MC78M09CDTG require an input bypass capacitor?
Yes, the MC78M09CDTG requires a minimum 0.33 µF tantalum or low-ESR ceramic capacitor placed directly across pins 1 (Input) and 2 (GND). This capacitor stabilizes high-frequency response and prevents oscillation, especially when long traces or high-impedance sources are present - omission risks instability or output ripple amplification.
Can the MC78M09CDTG be used in automotive applications?
No, the MC78M09CDTG is rated for 0°C to +125°C junction temperature and is not AEC-Q100 qualified. For automotive use, select the NCV78M09BDTRKG variant, which is specified for −40°C to +125°C and certified to AEC-Q100 Grade 1 with PPAP capability - the "NCV" prefix denotes automotive qualification.
What is the thermal resistance and how does it affect PCB layout for the MC78M09CDTG?
The MC78M09CDTG has θJA = 92°C/W (junction-to-air) and θJC = 5.0°C/W (junction-to-case) in DPAK-3. To maintain safe junction temperature, the exposed thermal pad (pin 2) must be soldered to ≥2 cm² of 2 oz. copper with ≥4 thermal vias - insufficient copper area will cause thermal derating well below 500 mA.
How does the MC78M09CDTG compare to the MC7809 in terms of output current capability?
The MC78M09CDTG is rated for 500 mA maximum continuous output current, whereas the standard MC7809 (TO-220) is rated for 1.0 A. Both share identical voltage accuracy and protection features, but the "M" suffix denotes the half-current variant optimized for smaller packages like DPAK-3 - use MC78M09CDTG where 500 mA suffices and board space is constrained.
MC78M09CDTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 9V
- 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
MC78M09CDTG FAQ
1.How can I place an order for MC78M09CDTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M09CDTG 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 MC78M09CDTG reliable?
The price and inventory of MC78M09CDTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M09CDTG is usually 5 days.
3.What payment methods are accepted for MC78M09CDTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M09CDTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M09CDTG?
MC78M09CDTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M09CDTG 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 MC78M09CDTG?
For technical support, including MC78M09CDTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M09CDTG requirements.
6.How does Aetrix verify that MC78M09CDTG is sourced from the original manufacturer or authorized distributors?
All MC78M09CDTG 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 MC78M09CDTG meets industry standards.
7.What is the process for return or replacement of MC78M09CDTG?
All MC78M09CDTG units undergo pre-shipment inspection (PSI). If there is an issue with MC78M09CDTG, 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 MC78M09CDTG part is unused and in its original packaging.
Return procedure for MC78M09CDTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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