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onsemi MC33275ST-3.3T3
- Part No.:
- MC33275ST-3.3T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33275ST-3.3T3.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
MC33275ST-3.3T3 from onsemi is a micropower low-dropout linear voltage regulator delivering a fixed 3.3 V output at up to 300 mA, with dropout voltage as low as 25 mV at 10 mA load and 260 mV at full 300 mA load. It features internal current and thermal limiting, operates across −40°C to +125°C, and is housed in a Pb-free SOT-223 package - ideal for battery-powered handheld instruments and camcorders requiring extended runtime and stable low-noise supply.
For engineers reviewing the MC33275ST-3.3T3 datasheet, pinout, applications, or equivalent options, this page provides verified specifications, thermal behavior under load, stability conditions with minimal output capacitance (0.33 µF), and real-world design guidance for portable and industrial embedded systems.
Technical Context
The MC33275ST-3.3T3 uses a PNP pass transistor architecture enabling ultra-low dropout performance and tight line/load regulation (≤10 mV and ≤25 mV respectively). Its quiescent current is only 125 µA typical in normal operation, rising to 1500–2000 µA in saturation mode when input drops near VOUT, ensuring predictable behavior during brown-out conditions.
Stability is guaranteed with ≥0.33 µF ceramic or tantalum output capacitance for the 3.3 V version, and the device includes thermal shutdown activation at 150°C without hysteresis - causing cyclical output disable/enable if sustained overheating occurs. Ripple rejection exceeds 65 dB at 120 Hz, and output noise is 46 µVRMS (10 Hz–100 kHz) with 200 µF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V ±2% over −40°C to +125°C - ensures reliable logic-level supply for 3.3 V microcontrollers and sensors. |
| Max Output Current | 300 mA - sufficient to power multiple ICs in compact portable devices without external boost circuitry. |
| Dropout Voltage | 260 mV at 300 mA - enables operation from single-cell Li-ion (3.4 V min) or two-cell alkaline (3.6 V min) sources. |
| Quiescent Current | 125 µA typical - minimizes standby power loss in battery-critical applications like remote sensors. |
| Thermal Shutdown | 150°C activation - protects against PCB-level thermal runaway without requiring external thermal management. |
| Ripple Rejection | 65 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC inputs. |
| Output Noise | 46 µVRMS (10 Hz–100 kHz, 200 µF COUT) - suitable for analog front-ends and precision ADC references. |
Pinout & Package
MC33275ST-3.3T3 is packaged in a Pb-free SOT-223 (Case 318E) surface-mount package with exposed thermal pad for enhanced heat dissipation. The package measures 6.7 mm × 3.7 mm × 1.8 mm and supports up to 245°C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Main unregulated input supply; must exceed VOUT by ≥260 mV at full load to maintain regulation. |
| 2 (Ground) | GND | Power ground reference; connects directly to PCB ground plane and thermal pad for optimal thermal performance. |
| 3 (Output) | VOUT | Regulated 3.3 V output; requires ≥0.33 µF capacitor placed adjacent to pin for stability. |
| 4 (Tab) | Thermal Pad / GND | Internally connected to GND; must be soldered to ≥1 cm² copper area for RJA ≤92°C/W (TA = 25°C). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 25 mV at 10 mA load - enables use in energy-harvesting and coin-cell applications where input margin is minimal. |
| Minimal external capacitance | Stable with only 0.33 µF output capacitor - reduces BOM count and board space vs. legacy LDOs requiring ≥10 µF. |
| Integrated protection | Current limit (450 mA typ.) + thermal shutdown (150°C) - eliminates need for discrete foldback or thermal sensors. |
| Low-noise operation | 46 µVRMS noise with 200 µF COUT - meets requirements for RF receivers and high-resolution data acquisition. |
| Pb-free & AEC-Q100 capable | NCV33275ST-3.3T3G variant qualified for automotive - same footprint supports industrial-to-automotive migration. |
Applications
| Hand-Held Test Equipment | Portable Medical Sensors |
|---|---|
Use Scenario: Battery-powered multimeter with LCD display, microcontroller, and analog front-end operating from 2×AA cells (3.0 V nominal). IC Role / Device Role / Timing Role: Primary 3.3 V supply regulator for MCU core, ADC reference, and display driver. Use Value: 260 mV dropout allows full 300 mA delivery down to 3.56 V input, extending usable battery life by >18% vs. standard 500 mV-dropout regulators. |
Use Scenario: Wearable ECG patch using ultra-low-power MCU and analog signal chain powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Low-quiescent-current LDO generating clean 3.3 V rail from stepped-up 3.3 V switcher output. Use Value: 125 µA IQ preserves battery capacity during sleep mode; 46 µV RMS noise prevents baseline drift in 24-bit ADC measurements. |
| Industrial Data Loggers | Camcorder Power Management |
Use Scenario: Remote environmental logger with LoRaWAN radio, temperature/humidity sensor, and flash memory, operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main system regulator supplying 3.3 V to MCU, radio transceiver, and sensor interface. Use Value: Guaranteed 3.3 V ±2% output across full industrial temperature range ensures reliable SPI/I²C communication and flash write integrity. |
Use Scenario: Consumer camcorder using Li-ion battery (3.0–4.2 V) to power image sensor, video processor, and OLED viewfinder. IC Role / Device Role / Timing Role: Post-regulator for noise-sensitive analog video path and digital core logic. Use Value: 65 dB ripple rejection suppresses switching noise from upstream DC-DC converter, eliminating visible banding in recorded video. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 250 mA max output, 1.6 µA quiescent current, SOT-23-3 package - lower IQ but lower current capability and no thermal shutdown. | Better for nano-power sensor nodes; unsuitable for 300 mA loads or thermally constrained enclosures. | Select MCP1700T-3302E/MB only when load <200 mA and standby IQ <2 µA is mandatory. |
| NCP1117ST33T3G | 1 A output, 6 mA IQ, TO-220/SOT-223, higher dropout (1.2 V at 800 mA) - robust but inefficient for battery use. | Preferred for wall-powered industrial controllers; excessive IQ and dropout make it impractical for portable gear. | Choose NCP1117ST33T3G only in fixed-line applications where thermal headroom and cost outweigh efficiency needs. |
Compared with MCP1700T-3302E/MB and NCP1117ST33T3G, the MC33275ST-3.3T3 uniquely balances 300 mA capability, 125 µA IQ, integrated thermal/current protection, and 260 mV dropout - making it the only viable choice for mid-power portable designs needing both runtime and reliability.
Availability
MC33275ST-3.3T3 is available at Aetrix Electronics and suitable for battery-powered consumer products, handheld instruments, and camcorders requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC33275ST-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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The MC33275ST-3.3T3 belongs to onsemi's micropower LDO regulator family designed specifically for battery-constrained portable electronics where extended runtime, small solution size, and robust protection are critical.
FAQ
What is the minimum input voltage required for MC33275ST-3.3T3 to maintain regulation at 300 mA?
The MC33275ST-3.3T3 requires an input voltage ≥3.56 V (3.3 V + 260 mV dropout) to sustain 300 mA output while maintaining regulation. Below this, output voltage collapses linearly with input; datasheet Figure 7 confirms 260 mV dropout at 300 mA across temperature.
Can MC33275ST-3.3T3 operate with a 0.22 µF output capacitor?
No - the MC33275ST-3.3T3 requires ≥0.33 µF output capacitance for stability per datasheet Section 8. A 0.22 µF capacitor may cause oscillation or poor transient response. For 3.3 V versions, 0.33 µF is the absolute minimum; 1.0 µF is recommended for improved load step immunity.
Does MC33275ST-3.3T3 include reverse-voltage protection?
No - the MC33275ST-3.3T3 lacks internal reverse-voltage protection. Applying reverse polarity to VIN or VOUT can damage the device. External protection (e.g., series Schottky diode or MOSFET-based OR-ing) is required in systems prone to battery insertion errors or back-driving.
How does thermal shutdown behave in MC33275ST-3.3T3 during continuous overload?
When junction temperature reaches 150°C, MC33275ST-3.3T3 disables output with no hysteresis. As temperature drops below threshold, output re-enables - causing visible output oscillation under sustained overload. This is intentional behavior per datasheet Section 8; proper heatsinking or current limiting is required to avoid cycling.
Is MC33275ST-3.3T3 pin-compatible with NCV33275ST-3.3T3G?
Yes - MC33275ST-3.3T3 and NCV33275ST-3.3T3G share identical SOT-223 pinout, electrical specs, and thermal characteristics. The NCV variant adds AEC-Q100 qualification and PPAP support for automotive use, but both are mechanically and electrically interchangeable in non-automotive designs.
MC33275ST-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):
- 13V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
MC33275ST-3.3T3 FAQ
1.How can I place an order for MC33275ST-3.3T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33275ST-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 MC33275ST-3.3T3 reliable?
The price and inventory of MC33275ST-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 MC33275ST-3.3T3 is usually 5 days.
3.What payment methods are accepted for MC33275ST-3.3T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33275ST-3.3T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33275ST-3.3T3?
MC33275ST-3.3T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33275ST-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 MC33275ST-3.3T3?
For technical support, including MC33275ST-3.3T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33275ST-3.3T3 requirements.
6.How does Aetrix verify that MC33275ST-3.3T3 is sourced from the original manufacturer or authorized distributors?
All MC33275ST-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 MC33275ST-3.3T3 meets industry standards.
7.What is the process for return or replacement of MC33275ST-3.3T3?
All MC33275ST-3.3T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33275ST-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 MC33275ST-3.3T3 part is unused and in its original packaging.
Return procedure for MC33275ST-3.3T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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