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onsemi MC78M15ABDT
- Part No.:
- MC78M15ABDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC78M15ABDT.pdf
- Description:
- IC REG LINEAR 15V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,221
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Product details
Overview
MC78M15ABDT from onsemi is a 500 mA, 15 V fixed-output positive voltage regulator in DPAK-3 (TO-252) package, featuring ±2% output accuracy, internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local regulation. It delivers stable 15 V output across −40°C to +125°C junction temperature range with ≤300 mV load regulation (5–500 mA) and 10 mV line regulation (17.5–30 V input).
For engineers reviewing the MC78M15ABDT datasheet, pinout, applications, or equivalent options, this device is selected for automotive body control modules, industrial sensor power supplies, and embedded microcontroller auxiliary rails where extended temperature operation, Pb-free compliance, and minimal external components are required.
Technical Context
The MC78M15ABDT implements a monolithic three-terminal linear regulator architecture with an integrated pass transistor, precision bandgap reference, error amplifier, and protection circuitry. Its dropout voltage is fixed at 2.0 V (typ), enabling operation with input as low as 17 V while maintaining 15 V output under full 500 mA load.
Thermal overload protection activates at +150°C junction temperature, and short-circuit current limit is internally set to 350 mA (typ) at 35 V input. Output noise is 90 µVRMS (10 Hz–100 kHz), and ripple rejection reaches 54 dB at 100 mA/120 Hz with 18.5–28.5 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15 V ±2% (±0.3 V) at TJ = 25°C - ensures tight regulation for analog front-ends and MCU I/O supply rails |
| Max Output Current | 500 mA continuous - supports mid-power peripherals like CAN transceivers or op-amp arrays without external boosting |
| Input Voltage Range | 17.5 V to 30 V DC - compatible with 24 V automotive and industrial bus systems after transient suppression |
| Load Regulation | ≤300 mV (5–500 mA) - maintains output stability across dynamic load steps in motor driver logic supplies |
| Line Regulation | ≤10 mV (17.5–30 V) - rejects input ripple from unregulated switch-mode pre-stages |
| Dropout Voltage | 2.0 V (typ) - enables use with marginal input headroom in battery-backed systems |
| Junction Temp Range | −40°C to +125°C - qualified for under-hood automotive and factory-floor industrial environments |
Pinout & Package
DPAK-3 (TO-252) package with exposed thermal pad (Pin 2 connected to heatsink surface). Compact 6.10 × 6.54 × 2.28 mm footprint optimized for high-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input (17.5–30 V); requires ≥0.33 µF low-ESR bypass capacitor adjacent to pin |
| 2 | Ground / Heatsink | Common return path and thermal interface; must be connected to large copper pour for thermal management |
| 3 | Output | Regulated 15 V output; stable into capacitive loads up to 100 µF without oscillation |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with internal feedback network - eliminates need for external resistors or compensation caps in standard applications |
| ±2% output accuracy (A-grade) | Tighter tolerance than standard B/C variants - reduces margining overhead in precision analog subsystems |
| Internal thermal shutdown | Automatic disable above +150°C junction - prevents catastrophic failure during sustained overload or poor heatsinking |
| Short-circuit current limiting | 350 mA (typ) foldback limit - protects upstream supply and wiring during output faults |
| Pb-free, RoHS-compliant package | DPAK-3 (Case 369C) with G-marking - meets automotive and industrial environmental compliance requirements |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering microcontroller, LIN transceiver, and door-lock actuator drivers in vehicle door modules. IC Role / Device Role / Timing Role: Primary 15 V local regulator supplying MCU core logic and peripheral interfaces. Use Value: −40°C to +125°C operation ensures reliability in under-door cavity environments; ±2% accuracy maintains ADC reference stability. | Use Scenario: Providing clean 15 V bias to strain-gauge amplifiers and 4–20 mA transmitter circuits in process instrumentation. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital power domains. Use Value: 90 µVRMS output noise and 54 dB ripple rejection preserve signal integrity in sub-mV-level measurements. |
| Embedded Motor Driver Logic Supply | Medical Diagnostic Equipment Auxiliary Rail |
Use Scenario: Generating gate-drive and logic supply for 24 V BLDC motor controllers in HVAC blowers. IC Role / Device Role / Timing Role: Isolated 15 V rail for half-bridge gate drivers and current-sense amplifiers. Use Value: 2.0 V dropout enables operation during brown-out conditions; thermal shutdown prevents latch-up during stall events. | Use Scenario: Powering isolated data acquisition front-ends and display backlight drivers in portable ultrasound units. IC Role / Device Role / Timing Role: Safety-redundant auxiliary voltage source compliant with IEC 60601-1 creepage requirements. Use Value: Pb-free DPAK package supports medical RoHS mandates; 500 mA output sustains pulsed LED backlight loads without sag. |
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 | Same 15 V output but ±4% accuracy (C-grade) and 0°C to +125°C temp range | Suitable for non-automotive industrial controls where cost sensitivity outweighs accuracy and cold-start performance | Select when operating ambient stays above 0°C and ±4% output tolerance is acceptable |
| NCV78M15BDTRKG | Identical electrical specs and −40°C to +125°C range, but AEC-Q100 qualified and PPAP-capable | Required for safety-critical automotive applications (e.g., ADAS sensors, powertrain ECUs) | Choose for production automotive programs needing certified qualification and traceable manufacturing |
Compared with MC78M15CDTRKG, the MC78M15ABDT offers tighter ±2% regulation and extended low-temperature capability; versus NCV78M15BDTRKG, it lacks formal AEC-Q100 certification but shares identical electrical behavior and thermal performance - making it ideal for cost-sensitive automotive-adjacent designs.
Availability
MC78M15ABDT is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and embedded motor control systems requiring stable component supply with guaranteed long-term availability.
Supply support for MC78M15ABDT 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC78MxxA series was designed specifically for robust local regulation in harsh environments - delivering high-accuracy, thermally protected 500 mA output in compact surface-mount packages for automotive and industrial applications.
FAQ
What is the maximum input voltage rating for the MC78M15ABDT?
The MC78M15ABDT has an absolute maximum input voltage of 40 V DC, as specified in the Maximum Ratings table. However, for reliable operation within datasheet performance limits, the recommended input range is 17.5 V to 30 V DC. Exceeding 30 V may degrade line regulation and increase thermal stress without improving functionality.
Does the MC78M15ABDT require an input bypass capacitor?
Yes, the MC78M15ABDT requires a minimum 0.33 µF low-ESR capacitor (e.g., tantalum or ceramic) placed directly across Pins 1 and 2. This capacitor stabilizes the regulator under high-frequency load transients and prevents oscillation, especially when connected via long traces to upstream filtering stages.
What is the thermal resistance (θJA) of the MC78M15ABDT in its DPAK-3 package?
The MC78M15ABDT in DPAK-3 (Case 369C) has a typical junction-to-air thermal resistance (θJA) of 92°C/W under standard JEDEC test conditions (1-inch² 2-oz copper pad). With proper PCB copper area and thermal vias, θJA can be reduced to ~40°C/W, enabling 500 mA operation at ambient temperatures up to 70°C.
Can the MC78M15ABDT be used in parallel to increase output current?
No, the MC78M15ABDT is not designed for parallel operation. Its output voltage tolerance (±2%) and lack of current-sharing features make direct paralleling unstable and prone to thermal runaway. For higher current needs, use a single higher-rated regulator or implement external current-boosting with a PNP transistor as documented in Figure 12 of the datasheet.
Is the MC78M15ABDT pin-compatible with other MC78Mxx regulators in DPAK-3?
Yes, all MC78Mxx devices in DPAK-3 (DT suffix) share identical pinout: Pin 1 = Input, Pin 2 = Ground/Heatsink, Pin 3 = Output. This allows drop-in replacement across output voltages (5 V to 24 V) when board layout and thermal design accommodate the specific voltage's input range and power dissipation.
MC78M15ABDT 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
MC78M15ABDT FAQ
1.How can I place an order for MC78M15ABDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78M15ABDT 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 MC78M15ABDT reliable?
The price and inventory of MC78M15ABDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78M15ABDT is usually 5 days.
3.What payment methods are accepted for MC78M15ABDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78M15ABDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78M15ABDT?
MC78M15ABDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78M15ABDT 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 MC78M15ABDT?
For technical support, including MC78M15ABDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78M15ABDT requirements.
6.How does Aetrix verify that MC78M15ABDT is sourced from the original manufacturer or authorized distributors?
All MC78M15ABDT 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 MC78M15ABDT meets industry standards.
7.What is the process for return or replacement of MC78M15ABDT?
All MC78M15ABDT units undergo pre-shipment inspection (PSI). If there is an issue with MC78M15ABDT, 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 MC78M15ABDT part is unused and in its original packaging.
Return procedure for MC78M15ABDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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