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onsemi MC33269ST-3.3T3
- Part No.:
- MC33269ST-3.3T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33269ST-3.3T3.pdf
- Description:
- IC REG LINEAR 3.3V 800MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
MC33269ST-3.3T3 from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 3.3 V at up to 800 mA with 1.0 V dropout at 500 mA, ±1% output voltage tolerance, and integrated thermal shutdown and short-circuit protection. It serves as a primary power supply for microcontroller cores, FPGA I/O banks, and industrial sensor interfaces where stable low-noise 3.3 V rail generation is required from marginal input sources such as 5 V bus or battery-derived supplies.
For engineers reviewing the MC33269ST-3.3T3 datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (SOT-223), confirmed electrical parameters (dropout, load regulation, ripple rejection), thermal resistance data (θJA = 156 °C/W), and two validated alternative parts for design flexibility in cost-, space-, or qualification-sensitive deployments.
Technical Context
The MC33269ST-3.3T3 employs a composite PNP–NPN pass transistor architecture enabling low dropout operation while maintaining stability with ≥10 µF output capacitance (ESR <10 Ω). Its internal reference is trimmed to 1.25 V with ±1% accuracy over line, load, and temperature (−40°C to +125°C).
Thermal protection activates at ~170°C junction temperature without hysteresis, causing output disable; recovery occurs only upon cooling. The device requires no minimum load current for fixed-output variants and supports input voltages up to 20 V, with dropout voltage rising predictably from 1.0 V (500 mA) to 1.35 V (800 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1% (3.27–3.33 V at 10 mA, 3.23–3.37 V across full load/temperature range) |
| Max Output Current | 800 mA continuous - sufficient to power ARM Cortex-M4/M7 MCU cores with peripherals active |
| Dropout Voltage | 1.0 V at 500 mA - enables regulation from 4.3 V input, critical for single-cell LiFePO₄ or 5 V bus derating |
| Line Regulation | 0.3% - ensures ≤10 mV output shift over 5.3 V to 20 V input variation, stabilizing downstream logic |
| Ripple Rejection | 55 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO |
| Quiescent Current | 5.5 mA typical - balances low-noise performance with standby power efficiency in always-on systems |
| Thermal Resistance θJA | 156 °C/W (SOT-223, free-air) - defines heatsink requirements; 50°C ambient rise at 500 mA load |
Pinout & Package
SOT-223 (Case 318E) package with exposed heatsink tab electrically connected to Pin 2 (VOUT). Mounting pad must be soldered to PCB copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND / Adj | Ground reference for fixed-output version; unused (bypassed to GND) - not adjustable |
| 2 | VOUT | Regulated 3.3 V output; also connected to heatsink tab - requires low-impedance PCB thermal plane |
| 3 | VIN | Input supply (4.3 V to 20 V); must include ≥0.33 µF high-frequency bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | 1.0 V dropout at 500 mA enables use with underspecified input rails (e.g., 5 V ±10% bus) |
| ±1% Output Tolerance | Guaranteed over line/load/temperature eliminates need for external trimming in precision 3.3 V systems |
| Integrated Protection | Thermal shutdown (170°C) and foldback current limiting prevent damage during overload or poor heatsinking |
| Pb-Free & RoHS Compliant | Meets global environmental standards; marked with "G" suffix per onsemi packaging specification |
| Stable with Ceramic Output Caps | Validated with ≥10 µF tantalum or low-ESR electrolytic - avoids instability risks of pure ceramic solutions |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated CAN transceivers and analog sensor signal chains in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying noise-sensitive RS-485 PHYs and 16-bit ADC reference buffers. Use Value: 55 dB ripple rejection attenuates 120 Hz rectifier noise from 24 V AC-DC supply, preserving ADC SNR >85 dB. |
Use Scenario: Regulating power for LIN transceivers and door module microcontrollers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Fixed 3.3 V supply for NXP S32K144 MCU core and IO pads under cold-crank (6.5 V min) conditions. Use Value: 1.0 V dropout allows operation down to 4.3 V input, sustaining MCU functionality during engine start voltage sag. |
| Medical Patient Monitor Front-End | IoT Edge Node Sensor Hub |
Use Scenario: Providing clean 3.3 V bias to ECG amplifier stages and optical pulse oximetry LEDs. IC Role / Device Role / Timing Role: Low-noise post-regulator after buck converter, decoupling digital switching noise from analog front-end. Use Value: ±1% tolerance ensures consistent LED drive current and ADC reference scaling across temperature, reducing calibration drift. |
Use Scenario: Powering ultra-low-power ESP32-WROOM-32 Wi-Fi SoC and BME280 environmental sensors in battery-operated gateways. IC Role / Device Role / Timing Role: Main system regulator converting 3.6–4.2 V Li-ion battery to stable 3.3 V for RF and sensing subsystems. Use Value: 5.5 mA quiescent current extends battery life beyond 2 years in sleep-mode dominant deployments (10 µA avg). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, fixed-output voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST33T3G | 800 mA max, 1.2 V dropout at 800 mA, 1.5% tolerance, SO-8/SOT-223 options | Higher dropout reduces usable input range; wider tolerance increases margining burden in precision systems | Preferred when SO-8 footprint compatibility is required or when higher thermal resistance (θJA = 156 °C/W same) is acceptable |
| TLV73333PDBVR | 300 mA max, 170 mV dropout at 300 mA, 1% tolerance, SOT-23-5 package | Lower current rating limits use to sub-300 mA loads; ultra-low dropout enables 3.47 V input operation | Selected for space-constrained designs with light loads (<300 mA) and tight input headroom (e.g., coin-cell backup rails) |
Compared with NCP1117ST33T3G and TLV73333PDBVR, the MC33269ST-3.3T3 delivers superior current capability (800 mA vs. 300–800 mA) and tighter initial tolerance (±1% vs. ±1.5%/±1%), making it optimal for industrial and automotive applications demanding robust 3.3 V regulation under wide thermal and load variation.
Availability
MC33269ST-3.3T3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical patient monitor front-ends requiring stable component supply with guaranteed long-term continuity.
Supply support for MC33269ST-3.3T3 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 technologies for automotive, industrial, and cloud infrastructure markets.
The MC33269 series was designed for low-input-voltage, medium-current applications demanding high reliability and minimal power loss - particularly targeting automotive body electronics, industrial controls, and medical instrumentation where dropout and thermal robustness are critical.
FAQ
What is the maximum input voltage rating for the MC33269ST-3.3T3?
The MC33269ST-3.3T3 supports a maximum input voltage of 20 V, as specified in the Absolute Maximum Ratings table. This allows safe operation from unregulated 12 V or 24 V industrial supplies with transient spikes, provided the dropout constraint (VIN − 3.3 V ≥ 1.0 V) is maintained for regulation.
Does the MC33269ST-3.3T3 require an external output capacitor, and what type is recommended?
Yes, the MC33269ST-3.3T3 requires an external output capacitor of at least 10 µF with ESR between 0.2 Ω and 10 Ω for stability. Solid tantalum capacitors are preferred for stable ESR over temperature; aluminum electrolytic types may cause oscillation at low temperatures due to rising ESR.
Is the MC33269ST-3.3T3 pin-compatible with other packages in the MC33269 family?
No - the MC33269ST-3.3T3 uses the SOT-223 (Case 318E) package with 3 pins and an exposed thermal pad tied to Pin 2. SO-8 (D suffix), DPAK (DT suffix), and TO-220 (T suffix) variants have different pin counts, layouts, and thermal characteristics; PCB layout is not interchangeable.
What is the thermal shutdown behavior of the MC33269ST-3.3T3?
The MC33269ST-3.3T3 disables its output when junction temperature reaches ~170°C. There is no hysteresis, so repeated cycling (oscillation) occurs if heat dissipation is insufficient. This protects against catastrophic failure but requires proper heatsinking - e.g., ≥1 in² 2 oz. copper pad - to sustain 800 mA at 50°C ambient.
Can the MC33269ST-3.3T3 be used in automotive applications?
The MC33269ST-3.3T3 is not AEC-Q100 qualified; only NCV-prefix variants (e.g., NCV33269DTRK-3.3) meet automotive requirements. While it operates across −40°C to +125°C ambient, its qualification status, PPAP capability, and site-controlled manufacturing are limited to the NCV series.
MC33269ST-3.3T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 8 mA
- 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:
- SOT-223 (TO-261)
MC33269ST-3.3T3 FAQ
1.How can I place an order for MC33269ST-3.3T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33269ST-3.3T3 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 MC33269ST-3.3T3 reliable?
The price and inventory of MC33269ST-3.3T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33269ST-3.3T3 is usually 5 days.
3.What payment methods are accepted for MC33269ST-3.3T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33269ST-3.3T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33269ST-3.3T3?
MC33269ST-3.3T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33269ST-3.3T3 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 MC33269ST-3.3T3?
For technical support, including MC33269ST-3.3T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33269ST-3.3T3 requirements.
6.How does Aetrix verify that MC33269ST-3.3T3 is sourced from the original manufacturer or authorized distributors?
All MC33269ST-3.3T3 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 MC33269ST-3.3T3 meets industry standards.
7.What is the process for return or replacement of MC33269ST-3.3T3?
All MC33269ST-3.3T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33269ST-3.3T3, 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 MC33269ST-3.3T3 part is unused and in its original packaging.
Return procedure for MC33269ST-3.3T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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