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onsemi MC33269T-3.5G
- Part No.:
- MC33269T-3.5G
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC33269T-3.5G.pdf
- Description:
- IC REG LINEAR 3.5V 800MA TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,673
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Product details
Overview
MC33269T-3.5G from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 3.5 V at up to 800 mA, featuring 1.0 V dropout at 500 mA, ±1.0% output voltage tolerance, and integrated thermal shutdown and short-circuit protection. It is designed for low-input-voltage power rails in industrial control modules and automotive body electronics where stable, low-noise 3.5 V supply is required.
For engineers reviewing the MC33269T-3.5G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific pin definitions, real-world use cases, and validated alternative options for precision 3.5 V regulation in thermally constrained environments.
Technical Context
The MC33269T-3.5G employs a composite PNP–NPN pass transistor architecture enabling 1.0 V dropout while sustaining 800 mA output current. Its internal reference is trimmed to 1.25 V with ±1% accuracy over line, load, and temperature (−40°C to +125°C).
It integrates current limiting and thermal shutdown without external components, and requires only a 10 µF output capacitor (ESR < 10 Ω) for stability. Ripple rejection exceeds 55 dB at 120 Hz, supporting noise-sensitive analog subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.5 V ±1.0% (3.465 V to 3.535 V at 10 mA, 25°C); ensures tight compliance for microcontroller I/O or sensor biasing. |
| Dropout Voltage | 1.0 V max at 500 mA; enables operation from as low as 4.5 V input for 3.5 V rail in battery-backed systems. |
| Output Current | 800 mA continuous; sufficient to power multiple logic ICs or small MCU peripherals without external boost. |
| Ripple Rejection | 55 dB min at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry. |
| Thermal Shutdown | Activates at ~170°C junction temperature; protects against sustained overload without external sensing circuitry. |
| Quiescent Current | 5.5 mA max (for 1.5–3.5 V outputs); minimizes standby power loss in always-on industrial monitoring nodes. |
| Input Voltage Range | Up to 20 V; accommodates 12 V nominal automotive or industrial bus with transient margin. |
Pinout & Package
MC33269T-3.5G uses the TO-220AB (Case 221AB) package - a through-hole, heat-sinkable 3-pin outline with Pin 2 (VOUT) electrically connected to the metal tab for enhanced thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal error amplifier and current limit circuit; must be low-impedance connection to minimize noise coupling. |
| 2 | VOUT | Regulated 3.5 V output; metal tab is internally bonded to this pin - heatsinking directly improves thermal resistance (θJC = 5.0°C/W). |
| 3 | VIN | Unregulated input supply; requires ≥4.5 V minimum for regulation; decoupling capacitor recommended near this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.5 V Output | Eliminates external resistor network; reduces BOM count and layout area versus adjustable regulators. |
| 1.0 V Dropout at 500 mA | Enables higher efficiency than standard linear regulators in low-VIN–VOUT margin applications (e.g., 5 V → 3.5 V). |
| ±1.0% Output Tolerance | Guarantees compatibility with 3.3 V logic families requiring tight VCC margins, even across full temperature range. |
| Integrated Thermal Shutdown | Self-protects during ambient overheating or PCB layout thermal bottlenecks - no external thermal sensor needed. |
| Pb-Free TO-220 Package | Complies with RoHS; metal tab allows direct mounting to chassis or heatsink for industrial-grade thermal management. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital input buffers and CAN transceiver logic rails in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary 3.5 V LDO supplying noise-sensitive interface ICs adjacent to high-current solenoid drivers. Use Value: 55 dB ripple rejection prevents switching noise from corrupting digital signal integrity during simultaneous actuator activation. |
Use Scenario: Regulating 3.5 V for interior lighting controllers and door module microcontrollers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable supply to 32-bit MCU cores and LIN transceivers under cold-crank (6.0 V) and load-dump (20 V) conditions. Use Value: 20 V absolute maximum input rating and thermal shutdown ensure robustness across automotive transients without derating. |
| Medical Sensor Signal Chain | Point-of-Sale Terminal Power |
Use Scenario: Supplying ultra-low-noise analog front-end (AFE) stages for ECG or pulse oximetry sensors. IC Role / Device Role / Timing Role: Low-noise, fixed 3.5 V source for precision op-amps and ADC reference buffers. Use Value: Tight ±1.0% output tolerance and minimal quiescent current (5.5 mA) preserve signal-to-noise ratio and battery life. |
Use Scenario: Generating 3.5 V for EMV contactless payment ICs and secure element interfaces in handheld terminals. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 5 V DC/DC converter, powering cryptographic co-processors. Use Value: 800 mA output capacity supports burst-mode RF transmission without voltage sag or brownout reset. |
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 |
|---|---|---|---|
| LM2936MP-3.5/NOPB | Lower IQ (15 µA), lower IOUT (50 mA), wider VIN (4–40 V), but higher dropout (0.5 V @ 50 mA). | Suitable for ultra-low-power always-on sensors; insufficient for 800 mA loads like MCU+RF combos. | Select when standby current dominates design priority and load current ≤50 mA. |
| NCP1117ST3.3T3G | 3.3 V fixed output (not 3.5 V), 1 A output, 1.2 V dropout @ 800 mA, SO-8/SOT-223 only - no TO-220 option. | Requires board redesign for voltage mismatch and package change; lacks 3.5 V variant. | Consider only if system can tolerate 3.3 V and layout supports SMT-only assembly. |
Compared with LM2936MP-3.5/NOPB and NCP1117ST3.3T3G, the MC33269T-3.5G uniquely balances 3.5 V precision, 800 mA capability, TO-220 thermal performance, and automotive-grade transient robustness - making it the sole fit for high-current, fixed 3.5 V applications demanding mechanical heatsinking.
Availability
MC33269T-3.5G is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical sensor signal chains requiring stable component supply with long-term lifecycle support.
Supply support for MC33269T-3.5G 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 was engineered for cost-effective, robust linear regulation in low-input-voltage systems - targeting automotive body electronics, industrial controls, and medical devices needing reliable fixed-output LDOs with thermal resilience.
FAQ
What is the maximum input voltage for the MC33269T-3.5G?
The MC33269T-3.5G supports a maximum input voltage of 20 V, as specified in its Absolute Maximum Ratings table. This rating allows safe operation under automotive load-dump conditions (up to 18 V typical, with margin) and industrial 12 V bus transients. Exceeding 20 V risks permanent damage to the internal pass transistor and protection circuitry.
Does the MC33269T-3.5G require an input capacitor?
The MC33269T-3.5G does not require an input capacitor for stability, per the datasheet. However, a ≥0.33 µF low-ESR capacitor (tantalum, ceramic, or film) placed directly across the VIN and GND pins is strongly recommended to improve transient response and reduce sensitivity to high-frequency input impedance - especially when connected via long traces or cables to upstream filters.
How is thermal performance affected by the TO-220 metal tab connection?
The TO-220AB package of the MC33269T-3.5G bonds Pin 2 (VOUT) to the metal tab, achieving a low junction-to-case thermal resistance of 5.0°C/W. Mounting the tab to a heatsink or large copper pour significantly lowers operating junction temperature - critical for sustaining 800 mA output at elevated ambient temperatures (e.g., >85°C). Without heatsinking, power dissipation is limited by θJA = 65°C/W.
Can the MC33269T-3.5G be used in adjustable mode?
No - the MC33269T-3.5G is a fixed-output variant with internal feedback resistors trimmed for 3.5 V. Only the MC33269 (no suffix) or MC33269T (no voltage suffix) part numbers support adjustable operation via external R1/R2 divider on the ADJ pin. Attempting to modify the MC33269T-3.5G for adjustment will result in incorrect or unstable output voltage.
Is the MC33269T-3.5G qualified for automotive applications?
The MC33269T-3.5G is not AEC-Q100 qualified; only NCV-prefix variants (e.g., NCV33269T-3.5G) carry automotive qualification and PPAP capability. The MC33269T-3.5G is rated for −40°C to +125°C ambient operation and meets industrial reliability standards, but lacks the extended test scope and process controls required for automotive safety-critical systems.
MC33269T-3.5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3.5V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
MC33269T-3.5G FAQ
1.How can I place an order for MC33269T-3.5G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33269T-3.5G 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 MC33269T-3.5G reliable?
The price and inventory of MC33269T-3.5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33269T-3.5G is usually 5 days.
3.What payment methods are accepted for MC33269T-3.5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33269T-3.5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33269T-3.5G?
MC33269T-3.5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33269T-3.5G 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 MC33269T-3.5G?
For technical support, including MC33269T-3.5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33269T-3.5G requirements.
6.How does Aetrix verify that MC33269T-3.5G is sourced from the original manufacturer or authorized distributors?
All MC33269T-3.5G 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 MC33269T-3.5G meets industry standards.
7.What is the process for return or replacement of MC33269T-3.5G?
All MC33269T-3.5G units undergo pre-shipment inspection (PSI). If there is an issue with MC33269T-3.5G, 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 MC33269T-3.5G part is unused and in its original packaging.
Return procedure for MC33269T-3.5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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