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onsemi MC78M15BDT
- Part No.:
- MC78M15BDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M15BDT.pdf
- Description:
- IC REG LINEAR 15V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
MC78M15BDT from onsemi is a 500 mA, fixed +15 V positive linear voltage regulator in DPAK-3 (TO-252) package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable output under varying load (5–500 mA) and input (17.5–30 V), supporting local on-card regulation in industrial power supplies and embedded control systems.
For engineers reviewing the MC78M15BDT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world use cases, and validated alternative parts for automotive-grade 15 V regulation where −40°C to +125°C operation and Pb-free compliance are required.
Technical Context
The MC78M15BDT implements a monolithic three-terminal series pass architecture with built-in protection circuitry: thermal overload shutdown triggers at ~150°C junction temperature, short-circuit current limit holds peak output at 350 mA, and safe-area compensation dynamically reduces output current as dropout voltage increases - preventing secondary breakdown of the internal pass transistor.
It operates without external components but requires an input bypass capacitor (≥0.33 µF) for stability with long trace lengths or large output capacitance. Dropout voltage remains fixed at 2.0 V across temperature and load, enabling predictable minimum input headroom design in 15 V rail generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +15.0 V nominal; ±3% tolerance (14.25–15.75 V) over full load and line range ensures compatibility with 15 V logic and analog circuits. |
| Max Output Current | 500 mA continuous; 700 mA peak - supports moderate-power microcontrollers, sensors, and op-amps without external boosting. |
| Input Voltage Range | 17.5 V to 30 V DC - compatible with unregulated 24 V industrial rails after rectification and filtering. |
| Dropout Voltage | 2.0 V typical at 25°C - defines minimum VI = 17.0 V for stable 15 V output, critical for low-headroom designs. |
| Ripple Rejection | 54 dB at 100 mA / 120 Hz - suppresses AC ripple from bridge rectifiers, reducing post-regulation filtering requirements. |
| Thermal Resistance | Junction-to-case: 5.0°C/W - enables >7 W dissipation with minimal heatsink when mounted on ≥2 oz copper. |
| Operating Temp | −40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
DPAK-3 (TO-252) plastic surface-mount package with exposed thermal pad connected to Pin 2 (GND). Heatsink surface is electrically tied to ground for simplified thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input; must be ≥17.0 V for regulation and filtered with ≥0.33 µF capacitor near pin. |
| 2 | Ground | Common reference and thermal path; connects to PCB ground plane and heatsink surface. |
| 3 | Output | Stable +15 V regulated output; decoupling capacitor recommended at load for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Self-contained regulation eliminates need for feedback resistors or compensation networks - reduces BOM count and layout area. |
| Internal thermal shutdown | Automatic disable above ~150°C junction temperature prevents permanent damage during overload or poor heatsinking. |
| Short-circuit current limiting | Clamps output to ≤350 mA during fault, protecting both regulator and downstream circuitry from destructive currents. |
| Safe-area compensated pass transistor | Prevents second breakdown by reducing current as VCE rises - enables robust operation across wide input-output differentials. |
| Pb-free and RoHS compliant | Meets global environmental standards; marked with "G" suffix and qualified per J-STD-020 reflow profiles. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Local 15 V rail generation from 24 V battery or rectified AC in PLC I/O modules. IC Role / Device Role / Timing Role: Primary linear regulator providing clean, low-noise supply for analog front-ends and isolated gate drivers. Use Value: 90 µV RMS output noise and 54 dB ripple rejection minimize sensor measurement error and DAC reference drift. | Use Scenario: Powering window lift controllers, mirror adjust circuits, and HVAC actuators in passenger vehicles. IC Role / Device Role / Timing Role: Fixed-voltage regulator meeting AEC-Q100 Grade 2 (−40°C to +125°C) for non-safety-critical body electronics. Use Value: −40°C start-up capability and thermal shutdown ensure reliable operation in cold cranking and under-hood thermal cycling. |
| Test Equipment Bias Supply | Legacy Industrial Controller |
Use Scenario: Stable excitation voltage source for precision resistor calibration fixtures and benchtop DMMs. IC Role / Device Role / Timing Role: Low-drift 15 V reference generator with ±0.3 mV/°C tempco, used to bias Kelvin sensing bridges. Use Value: ±3% initial accuracy and ±0.3 mV/°C temperature coefficient enable <0.1% total error over operating range. | Use Scenario: Replacement regulator in aging CNC motion controllers using obsolete 78M15 variants. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade for MC78M15B in DPAK-3 footprint with identical thermal and electrical behavior. Use Value: Same pinout, same marking code "8M15B", and same tape-and-reel packaging (2500/reel) simplify legacy board rework. |
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 |
|---|---|---|---|
| MC78M15CDTRKG | 0°C to +125°C operating range; ±5% output tolerance vs. ±3% for MC78M15BDT. | Not qualified for automotive or extended-temperature industrial use. | Select when cost sensitivity outweighs temperature range and accuracy requirements. |
| NCV78M15BDTRKG | Identical electrical specs and package; AEC-Q100 Grade 1 (−40°C to +150°C) qualification and PPAP support. | Required for safety-critical automotive subsystems (e.g., ADAS power domains). | Choose for new automotive designs requiring full automotive qualification documentation and change control. |
Compared with MC78M15CDTRKG, the MC78M15BDT offers tighter output tolerance and wider temperature range; compared with NCV78M15BDTRKG, it lacks AEC-Q100 Grade 1 certification but shares identical electrical behavior and footprint - making it ideal for cost-sensitive industrial applications needing −40°C capability without full automotive audit overhead.
Availability
MC78M15BDT is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and test equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for MC78M15BDT 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 MC78Mxx series was designed as a rugged, drop-in replacement for legacy 78xx regulators - optimized for local voltage regulation in harsh environments with integrated protection and extended temperature operation.
FAQ
What is the maximum input voltage rating for MC78M15BDT?
The MC78M15BDT has an absolute maximum input voltage of 40 V DC, though continuous operation is specified up to 30 V under normal conditions. Exceeding 30 V may reduce reliability or trigger thermal shutdown depending on ambient temperature and heatsinking - always maintain ≥2.0 V dropout margin for regulation.
Does MC78M15BDT require an input bypass capacitor?
Yes, MC78M15BDT requires a minimum 0.33 µF input bypass capacitor placed directly across Pins 1 and 2. This stabilizes operation under high-frequency transients and long PCB trace inductance - tantalum, ceramic, or low-ESR polymer capacitors are recommended.
What is the thermal resistance junction-to-case for MC78M15BDT?
The MC78M15BDT has a junction-to-case thermal resistance (θJC) of 5.0°C/W, measured from die to the exposed thermal pad (Pin 2). This value assumes proper soldering to ≥1 in² of 2 oz copper, enabling >7 W power dissipation before reaching 150°C junction limit.
Can MC78M15BDT be used in automotive applications?
Yes, MC78M15BDT is rated for −40°C to +125°C operation and is Pb-free, making it suitable for non-safety-critical automotive applications like body control modules. For AEC-Q100-compliant designs, use the NCV78M15BDTRKG variant instead.
How does the short-circuit protection behave on MC78M15BDT?
Under short-circuit conditions, MC78M15BDT limits output current to approximately 350 mA while maintaining regulation - not shutting down completely. This allows safe fault detection and avoids thermal runaway, but sustained shorts still require external current monitoring or fusing for system-level protection.
MC78M15BDT 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):
- 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC78M15BDT FAQ
1.How can I place an order for MC78M15BDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M15BDT 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 MC78M15BDT reliable?
The price and inventory of MC78M15BDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M15BDT is usually 5 days.
3.What payment methods are accepted for MC78M15BDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M15BDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M15BDT?
MC78M15BDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M15BDT 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 MC78M15BDT?
For technical support, including MC78M15BDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M15BDT requirements.
6.How does Aetrix verify that MC78M15BDT is sourced from the original manufacturer or authorized distributors?
All MC78M15BDT 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 MC78M15BDT meets industry standards.
7.What is the process for return or replacement of MC78M15BDT?
All MC78M15BDT units undergo pre-shipment inspection (PSI). If there is an issue with MC78M15BDT, 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 MC78M15BDT part is unused and in its original packaging.
Return procedure for MC78M15BDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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