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onsemi MC33275DT-3.3RK
- Part No.:
- MC33275DT-3.3RK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC33275DT-3.3RK.pdf
- Description:
- IC REG LINEAR 3.3V 300MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,235
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Product details
Overview
MC33275DT-3.3RK from onsemi is a fixed-output, 3.3 V, 300 mA low-dropout (LDO) linear voltage regulator in DPAK-3 package. It delivers ultra-low dropout voltage (260 mV at 300 mA), tight load regulation (25 mV), and operates across −40°C to +125°C ambient range. Designed for battery-powered portable electronics, it extends runtime via 125 µA typical quiescent current and internal thermal/current limiting.
For engineers reviewing the MC33275DT-3.3RK datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at full load, stability with minimal 0.33 µF output capacitance, thermal shutdown behavior at 150°C, and Pb-free DPAK-3 mechanical compatibility in space-constrained designs.
Technical Context
This LDO employs a PNP pass transistor architecture enabling low dropout operation without requiring external bias rails. Its internal reference is trimmed to ±2% over −40°C to +125°C, and line regulation is maintained at ≤10 mV across 4.3 V to 12 V input range.
Thermal protection activates at 150°C junction temperature with no hysteresis, causing output toggling until cooling occurs. Current limiting is fixed at 450 mA and functions independently of thermal shutdown - both features are fully integrated and require no external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V ±2% over −40°C to +125°C - ensures stable MCU/core logic supply under wide thermal and load variation. |
| Max Output Current | 300 mA continuous - sufficient to power microcontrollers, sensors, and RF transceivers in handheld devices. |
| Dropout Voltage | 260 mV at 300 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (3.2 V min) sources. |
| Quiescent Current | 125 µA typical at zero load - minimizes standby power loss in always-on battery systems. |
| Load Regulation | ≤25 mV from 0–250 mA - maintains voltage accuracy during dynamic processor load transitions. |
| Ripple Rejection | ≥65 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Stability Capacitance | 0.33 µF ceramic or tantalum - allows compact, low-BOM-count designs without ESR constraints. |
Pinout & Package
DPAK-3 (Case 369A) package: thermally enhanced surface-mount outline with exposed drain pad (pin 2) for PCB heat sinking. Dimensions: 6.10 × 6.54 × 2.28 mm, 2.29 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Vin) | Main power input; accepts 3.6 V to 13 V - must be bypassed with ≥0.33 µF capacitor near pin. |
| 2 | Ground / Exposed Pad | Common return and thermal path; requires direct solder connection to large copper pour for RJA = 92°C/W. |
| 3 | Output (Vout) | Regulated 3.3 V supply; connects directly to load and output capacitor (min 0.33 µF). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 25 mV at 10 mA load - supports deep battery discharge while maintaining regulation. |
| Internal protection | Current limit (450 mA) + thermal shutdown (150°C) - eliminates need for external fault management circuitry. |
| Wide temperature range | −40°C to +125°C operating ambient - qualified for industrial and automotive under-hood environments. |
| Pb-free construction | RoHS-compliant DPAK-3 package with "G" suffix marking - meets global environmental compliance requirements. |
| Low-noise operation | 46 µVRMS (10 Hz–100 kHz) with 200 µF output cap - suitable for analog sensor and ADC reference supplies. |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
|
Use Scenario: Battery-powered pulse oximeter with analog front-end and BLE radio. IC Role / Device Role / Timing Role: Primary 3.3 V supply for op-amps, ADC, and wireless SoC. Use Value: 125 µA quiescent current extends battery life beyond 7 days on two AA cells; 260 mV dropout enables use until battery reaches 3.57 V. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics. IC Role / Device Role / Timing Role: Main system rail regulator powering FPGA, display driver, and laser diode controller. Use Value: Thermal shutdown prevents field failure during extended operation in hot ambient; DPAK-3 exposed pad sustains 300 mA at TA = 70°C with 1-in² 2 oz copper. |
| Camcorder Image Signal Chain | Smart Home Hub Power Management |
|
Use Scenario: HD camcorder with CMOS image sensor, video encoder, and SD card interface. IC Role / Device Role / Timing Role: Clean 3.3 V domain for sensor bias and digital I/O buffers. Use Value: 65 dB ripple rejection isolates sensitive analog circuits from noisy DC/DC converter inputs; 0.33 µF stability enables use of 0402 MLCCs. |
Use Scenario: Always-on Wi-Fi/Zigbee hub with multiple peripheral interfaces and real-time clock. IC Role / Device Role / Timing Role: Standby power regulator for RTC, memory retention, and wake-up circuitry. Use Value: 125 µA IQ enables >1 year battery backup on CR2032; ±2% output tolerance ensures reliable SRAM and RTC operation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST33T3G | 800 mA rated, higher IQ (6 mA), TO-220/SOT-223 only - no DPAK option. | Better for high-current, non-space-constrained industrial controls; unsuitable for thin-profile portable designs. | Select when >300 mA load or TO-220 heatsinking is acceptable; avoid if board height or thermal pad layout is constrained. |
| MCP1700T-3302E/MB | 250 mA max, 1.6 µA IQ, SOT-23 only - no thermal pad, lower current capability. | Optimized for ultra-low-power IoT endpoints; lacks thermal robustness for sustained 300 mA loads. | Choose for sub-100 µA standby systems where size trumps current capacity; not a functional replacement for MC33275DT-3.3RK's DPAK thermal performance. |
Compared with NCP1117ST33T3G and MCP1700T-3302E/MB, MC33275DT-3.3RK uniquely balances 300 mA delivery, DPAK thermal efficiency, and micropower IQ in a single footprint - making it optimal for mid-power portable equipment where board area and thermal management are co-constrained.
Availability
MC33275DT-3.3RK is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, camcorders, and smart home hubs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MC33275DT-3.3RK 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 sensing solutions for automotive, industrial, and consumer markets.
The MC33275 series belongs to onsemi's precision linear regulator product line, engineered specifically for battery-operated equipment demanding low dropout, micropower operation, and robust thermal protection without external components.
FAQ
What is the minimum input voltage required for MC33275DT-3.3RK to maintain regulation at 300 mA?
The MC33275DT-3.3RK requires a minimum input voltage of 3.56 V (3.3 V + 260 mV dropout) to sustain 3.3 V output at 300 mA load. Below this, output voltage drops linearly with input; datasheet testing confirms regulation holds down to 3.56 V at TJ = 25°C and degrades predictably with rising temperature.
Can MC33275DT-3.3RK operate with a 0.22 µF output capacitor?
No - MC33275DT-3.3RK requires ≥0.33 µF output capacitance for stability with 3.3 V output. The datasheet explicitly states 0.22 µF is only valid for 5.0 V versions; using 0.22 µF with MC33275DT-3.3RK risks oscillation and output overshoot during load transients.
Is MC33275DT-3.3RK pin-compatible with other packages in the MC33275 family?
No - MC33275DT-3.3RK uses DPAK-3 (3-pin) pinout, while MC33275D (SOIC-8) and MC33275ST (SOT-223) have different pin counts and assignments. Pin mapping is package-specific; PCB layout must match Case 369A mechanical dimensions and thermal pad requirements.
Does MC33275DT-3.3RK include reverse polarity protection?
No - MC33275DT-3.3RK has no internal reverse-voltage protection. Applying negative voltage to Vin or Vout relative to GND may damage the device. External protection (e.g., series diode or MOSFET-based circuit) is required in systems prone to battery reversal or hot-swap events.
What is the thermal resistance (RJA) of MC33275DT-3.3RK under standard JEDEC conditions?
Per datasheet Figure 18, MC33275DT-3.3RK (DPAK-3) achieves RJA = 92°C/W with 1-in² 2 oz copper on FR-4 PCB. This value assumes minimum pad size per Case 369C outline and is measured at TA = 25°C - actual RJA rises significantly with smaller copper area or elevated ambient temperature.
MC33275DT-3.3RK 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):
- 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:
- DPAK
MC33275DT-3.3RK FAQ
1.How can I place an order for MC33275DT-3.3RK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33275DT-3.3RK 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 MC33275DT-3.3RK reliable?
The price and inventory of MC33275DT-3.3RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33275DT-3.3RK is usually 5 days.
3.What payment methods are accepted for MC33275DT-3.3RK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33275DT-3.3RK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33275DT-3.3RK?
MC33275DT-3.3RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33275DT-3.3RK 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 MC33275DT-3.3RK?
For technical support, including MC33275DT-3.3RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33275DT-3.3RK requirements.
6.How does Aetrix verify that MC33275DT-3.3RK is sourced from the original manufacturer or authorized distributors?
All MC33275DT-3.3RK 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 MC33275DT-3.3RK meets industry standards.
7.What is the process for return or replacement of MC33275DT-3.3RK?
All MC33275DT-3.3RK units undergo pre-shipment inspection (PSI). If there is an issue with MC33275DT-3.3RK, 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 MC33275DT-3.3RK part is unused and in its original packaging.
Return procedure for MC33275DT-3.3RK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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