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onsemi MC33269DTRK-012
- Part No.:
- MC33269DTRK-012
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC33269DTRK-012.pdf
- Description:
- IC REG LINEAR 12V 800MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,788
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Product details
Overview
MC33269DTRK-012 from onsemi is a 12 V fixed-output, low-dropout linear voltage regulator in DPAK (TO-252) package, delivering ≥800 mA output current with 1.0 V dropout at 500 mA and ±1% output voltage tolerance. It integrates thermal shutdown and short-circuit protection, and is designed for low-input-voltage power rails in automotive and industrial control systems.
For engineers reviewing the MC33269DTRK-012 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage under load, thermal resistance in PCB layout, output stability with 10 µF tantalum capacitor, and AEC-Q100 qualification status for automotive use.
Technical Context
The MC33269DTRK-012 uses a composite PNP–NPN pass transistor architecture to achieve 1.0 V dropout at 500 mA while maintaining regulation across −40°C to +125°C ambient temperature. Its internal reference is trimmed to 1.25 V with ±1% accuracy over line, load, and temperature.
It requires an external 10 µF output capacitor (ESR 0.2–10 Ω) for stability and supports input voltages up to 20 V. Ripple rejection is 55 dB at 120 Hz, and quiescent current is 8.0 mA at 12 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.0 V ±1% (11.88–12.12 V), trimmed at factory for precision rail generation |
| Dropout Voltage | 1.0 V at 500 mA; 1.25 V at 800 mA - enables operation with Vin as low as 13.25 V |
| Output Current | ≥800 mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs |
| Thermal Resistance | Junction-to-case: 6.0 °C/W (DPAK) - mandates heatsink connection to Pin 2 for >1 W dissipation |
| Ripple Rejection | 55 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC sources |
| Protection Features | Thermal shutdown (activates ~170°C) and foldback current limiting - prevents catastrophic failure during overload |
Pinout & Package
DPAK (TO-252-3) package with exposed heatsink tab electrically connected to Pin 2 (VOUT). Mounting pad must be thermally coupled to PCB copper area per Figure 9 of datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND / Adj | Ground reference for fixed-output version; unused (bypassed) in MC33269DTRK-012 |
| 2 | VOUT | Regulated 12 V output; also connected to heatsink tab - critical for thermal performance |
| 3 | VIN | Input supply (max 20 V); requires local 0.33 µF bypass capacitor for transient immunity |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | 1.0 V dropout at 500 mA enables use with 13.2 V automotive battery under cold-crank conditions |
| Precision Output Tolerance | ±1% over line/load/temperature ensures stable 12 V rail for analog sensors and ADC references |
| Integrated Protection | Thermal shutdown and current limiting eliminate need for external fault-handling circuitry |
| Pb-Free DPAK Package | RoHS-compliant TO-252-3 with heatsink tab - supports automated reflow and high-power density layouts |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Powering CAN transceivers, LIN drivers, and door-lock actuators from 12 V battery with cold-crank headroom. IC Role / Device Role / Timing Role: Primary 12 V LDO regulator providing clean, regulated supply independent of battery sag. Use Value: 1.0 V dropout allows operation down to 13.25 V input, sustaining function during 13.5 V cold-crank dips. | Use Scenario: Generating isolated 12 V rail for analog input conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-output voltage regulator supplying precision op-amps and 16-bit ADC references. Use Value: ±1% output tolerance maintains measurement accuracy across −40°C to +85°C operating range. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit |
Use Scenario: Providing stable 12 V bias for motor driver ICs and real-time MCU subsystems in battery-backed infusion devices. IC Role / Device Role / Timing Role: Safety-critical power stage delivering fault-tolerant 12 V rail with thermal foldback. Use Value: Thermal shutdown at ~170°C prevents overheating in sealed enclosures without forced airflow. | Use Scenario: Local 12 V regulation for RF front-end biasing in outdoor small-cell base stations. IC Role / Device Role / Timing Role: Point-of-load regulator converting intermediate 15 V DC-DC output to noise-sensitive 12 V RF supply. Use Value: 55 dB ripple rejection at 120 Hz suppresses switching noise from upstream converters, reducing EVM degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV33269DTRK-012 | AEC-Q100 qualified, PPAP-capable, identical electrical specs and pinout | Required for automotive production programs needing certified qualification | Select when automotive-grade traceability and change control are mandatory |
| LM2940CT-12/NOPB | Higher dropout (0.5 V typical at 100 mA, but 1.3 V at 500 mA), SOIC-8 package, no thermal pad | Limited to lower-current or less thermally constrained designs | Choose only if board space permits SOIC-8 and thermal budget allows higher dropout |
Compared with NCV33269DTRK-012, the MC33269DTRK-012 lacks AEC-Q100 certification but shares identical electrical behavior and DPAK thermal performance; versus LM2940CT-12/NOPB, it delivers superior 800 mA capability and 6.0 °C/W junction-to-case resistance due to its exposed heatsink tab.
Availability
MC33269DTRK-012 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and medical device power rails requiring stable component supply and long-term manufacturability.
Supply support for MC33269DTRK-012 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 MC33269 series targets cost-sensitive, medium-current linear regulation in harsh environments - optimized for automotive and industrial applications where reliability, thermal robustness, and dropout performance are critical.
FAQ
What is the maximum input voltage rating for MC33269DTRK-012?
The MC33269DTRK-012 has an absolute maximum input voltage of 20 V. However, for the 12 V version, the input-output differential is limited to 8.0 V maximum due to this 20 V rating - meaning Vin must not exceed 20 V, and VIN − 12 V ≤ 8.0 V. This constraint ensures safe operation within internal transistor limits.
Does MC33269DTRK-012 require an external output capacitor, and what type is recommended?
Yes, MC33269DTRK-012 requires an external 10 µF output capacitor for stability. onsemi specifies a tantalum or low-ESR aluminum electrolytic capacitor with ESR between 0.2 Ω and 10 Ω over the full operating temperature range. Ceramic capacitors are discouraged due to potential instability from excessively low ESR.
Is MC33269DTRK-012 pin-compatible with other packages in the MC33269 family?
No - MC33269DTRK-012 uses the DPAK (TO-252-3) package with heatsink tab connected to Pin 2. SO-8 (MC33269DR2-012) and TO-220 (MC33269T-012) variants have different pinouts and thermal characteristics. Direct substitution requires PCB layout revision and thermal redesign.
What is the thermal shutdown threshold of MC33269DTRK-012, and does it include hysteresis?
The MC33269DTRK-012 thermal shutdown activates at approximately 170°C junction temperature. The datasheet explicitly states there is no hysteresis in the thermal limiting circuit - output disables above threshold and re-enables immediately upon cooling below 170°C, which may cause oscillatory behavior under sustained overload.
Can MC33269DTRK-012 be used in adjustable-output configurations?
No - MC33269DTRK-012 is a fixed 12 V output variant. Adjustable versions (e.g., MC33269DTRK) use the same DPAK package but require external resistors on the Adjust pin. The "-012" suffix denotes factory-trimmed 12 V output; the GND/Adj pin is internally tied to ground and must not be externally modified.
MC33269DTRK-012 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):
- 20V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 55dB (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
MC33269DTRK-012 FAQ
1.How can I place an order for MC33269DTRK-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33269DTRK-012 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 MC33269DTRK-012 reliable?
The price and inventory of MC33269DTRK-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33269DTRK-012 is usually 5 days.
3.What payment methods are accepted for MC33269DTRK-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33269DTRK-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33269DTRK-012?
MC33269DTRK-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33269DTRK-012 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 MC33269DTRK-012?
For technical support, including MC33269DTRK-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33269DTRK-012 requirements.
6.How does Aetrix verify that MC33269DTRK-012 is sourced from the original manufacturer or authorized distributors?
All MC33269DTRK-012 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 MC33269DTRK-012 meets industry standards.
7.What is the process for return or replacement of MC33269DTRK-012?
All MC33269DTRK-012 units undergo pre-shipment inspection (PSI). If there is an issue with MC33269DTRK-012, 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 MC33269DTRK-012 part is unused and in its original packaging.
Return procedure for MC33269DTRK-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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