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onsemi MC33275D-3.3
- Part No.:
- MC33275D-3.3
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33275D-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
MC33275D-3.3 from onsemi is a fixed-output, 3.3 V low-dropout linear voltage regulator in SOIC-8 package, delivering up to 300 mA output current with dropout voltage as low as 25 mV at 10 mA load and 260 mV at full 300 mA load. It features internal thermal shutdown and current limiting, tight line/load regulation (≤10 mV), and stable operation with only 0.33 µF output capacitance - ideal for battery-powered handheld instruments and portable consumer electronics requiring extended runtime.
For engineers reviewing the MC33275D-3.3 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout performance at 300 mA, quiescent current (125–200 µA), thermal protection behavior at 150°C, and compatibility with minimal ceramic output capacitance in space-constrained designs.
Technical Context
The MC33275D-3.3 employs a PNP pass transistor architecture enabling ultra-low dropout operation and micropower quiescent current. Its internal reference is trimmed to ±1% at 25°C and ±2% over −40°C to +125°C, supporting precision regulation in wide-temperature industrial environments.
Thermal shutdown activates at 150°C with no hysteresis, causing output oscillation until junction temperature falls below threshold; current limit is fixed at 450 mA. 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 ±1% at 25°C; ±2% over −40°C to +125°C - ensures stable MCU core/logic rail under thermal stress. |
| Max Output Current | 300 mA - sufficient to power microcontrollers, sensors, and RF modules in portable systems. |
| Dropout Voltage | 260 mV at 300 mA - enables operation from single-cell Li-ion (3.0 V min) or 3.3 V supply with margin. |
| Quiescent Current | 125–200 µA - minimizes standby power loss in battery-critical applications like remote sensors. |
| Line Regulation | ≤10 mV (Vin = VO+1 V to 12 V) - maintains output stability despite input fluctuations from aging batteries. |
| Load Regulation | ≤25 mV (0–250 mA) - prevents logic-level shifts during dynamic processor load transitions. |
| Ripple Rejection | ≥65 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
Pinout & Package
MC33275D-3.3 is housed in an 8-pin SOIC-8 (Case 751) surface-mount package with exposed pad for thermal enhancement. Pin 1 is marked by notch or dot; pins 4 and 5 are not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Vin | Main input supply connection; accepts up to 13 V DC - supports wide-input battery or adapter-fed systems. |
| 2 (N/C) | No Connect | Internally unconnected; must be left floating or tied to GND per layout best practice. |
| 3 (N/C) | No Connect | Internally unconnected; no electrical function - avoid routing signals or traces to this pin. |
| 4 (GND) | Ground | Power ground reference; connects to PCB ground plane - critical for noise immunity and thermal path. |
| 5 (N/C) | No Connect | Internally unconnected; electrically isolated - no external connection required. |
| 6 (N/C) | No Connect | Internally unconnected; no functional role - leave unpopulated or grounded if mechanical stability needed. |
| 7 (Output) | Vout | Regulated 3.3 V output; requires ≥0.33 µF ceramic capacitor placed adjacent to pin for stability. |
| 8 (GND) | Ground | Second ground terminal; ties to same ground net as Pin 4 - improves current return path and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 25 mV @ 10 mA enables regulation from near-dead batteries - extends usable runtime in portable devices. |
| Micropower operation | 125–200 µA quiescent current reduces self-heating and preserves battery capacity during sleep modes. |
| Minimal external capacitance | Stable with 0.33 µF output capacitor - eliminates need for bulky tantalum caps, saving board space and cost. |
| Integrated protection | Current limit (450 mA) and thermal shutdown (150°C) prevent damage during overload or poor heatsinking. |
| Pb-free & RoHS compliant | Meets global environmental standards; compatible with lead-free reflow soldering profiles (J-STD-020). |
Applications
| Hand-Held Medical Meter | Industrial Sensor Node |
|---|---|
Use Scenario: Portable blood glucose monitor powered by two AAA alkaline cells (1.8–3.2 V range) with intermittent LCD and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary 3.3 V rail regulator for MCU, sensor interface, and BLE radio - maintains stable voltage across battery discharge curve. Use Value: 260 mV dropout allows >90% of battery energy utilization; 200 µA IQ extends shelf life beyond 2 years in standby. |
Use Scenario: Wireless temperature/humidity node deployed in factory HVAC ducts, operating from 3.6 V lithium-thionyl chloride primary cell. IC Role / Device Role / Timing Role: Low-noise 3.3 V supply for precision ADC and RF transceiver - rejects ripple from internal DC/DC converter. Use Value: 65 dB ripple rejection suppresses switching artifacts; ±2% temp drift ensures sensor calibration integrity over −40°C to +85°C. |
| Camcorder Image Processor | Automotive Infotainment Accessory |
Use Scenario: Compact camcorder using single 3.7 V Li-ion cell, powering CMOS image sensor and video encoder ICs with burst current demands. IC Role / Device Role / Timing Role: Local LDO for noise-sensitive analog front-end and clock distribution - decouples digital switching noise. Use Value: 46 µVRMS output noise prevents image banding; 300 mA capability handles encoder peak loads without sag. |
Use Scenario: Aftermarket OBD-II dongle drawing power from vehicle's 12 V battery via integrated buck converter, requiring clean 3.3 V for CAN controller and microcontroller. IC Role / Device Role / Timing Role: Post-regulator for EMI-filtered intermediate rail - provides regulated, low-noise supply immune to automotive load dump transients. Use Value: Thermal shutdown protects against enclosure overheating; SOIC-8 package supports automated optical inspection (AOI) in high-volume assembly. |
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 |
|---|---|---|---|
| NCV33275ST-3.3T3G | Same die, SOT-223 package; lower thermal resistance (245°C/W vs 160°C/W); AEC-Q100 qualified. | Designed for automotive under-hood use; wider ambient range (−40°C to +125°C) with PPAP support. | Select when automotive qualification, higher power dissipation, or smaller footprint is required - not drop-in due to different pinout and thermal pad. |
| MCP1703T-3302E/MB | 300 mA LDO in SOT-23-5; 600 mV dropout at 250 mA; 2.5 µA quiescent current; no thermal shutdown. | Optimized for ultra-low-power IoT sensors; lacks current/thermal protection - requires external safeguards. | Choose for extreme battery life in low-duty-cycle applications where protection is handled at system level - not pin-compatible. |
Compared with NCV33275ST-3.3T3G, MC33275D-3.3 offers higher thermal resistance but SOIC-8 compatibility with standard pick-and-place; versus MCP1703T-3302E/MB, it trades ultra-low IQ for robust integrated protection and higher output current headroom.
Availability
MC33275D-3.3 is available at Aetrix Electronics and suitable for battery-powered consumer products, handheld instruments, and camcorders requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for MC33275D-3.3 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 MC33275 series belongs to onsemi's micropower LDO portfolio, engineered specifically for battery longevity and reliability in portable and harsh-environment electronics - emphasizing low dropout, minimal external components, and integrated fault protection.
FAQ
What is the maximum input voltage rating for MC33275D-3.3?
The MC33275D-3.3 has an absolute maximum input voltage of 13 V DC. Operation above this level risks permanent damage. For reliable long-term use, design input rails to stay ≤12 V, especially under transient conditions such as load dump or hot-swap events. The device is rated for continuous operation from 3.6 V to 12 V when regulating 3.3 V output.
Does MC33275D-3.3 require an input bypass capacitor?
Yes, MC33275D-3.3 requires an input bypass capacitor - recommended minimum 0.33 µF (tantalum, ceramic, or mylar) placed directly across pins 1 (Vin) and 4/8 (GND). This improves transient response and reduces sensitivity to high-frequency input impedance, particularly when connected via long traces (>10 cm) to upstream power sources.
Can MC33275D-3.3 operate stably with a 0.33 µF ceramic output capacitor?
Yes, MC33275D-3.3 is explicitly characterized for stability with a 0.33 µF ceramic output capacitor for 3.3 V output. This value satisfies phase margin requirements across temperature and load; larger values (e.g., 1–10 µF) further reduce output noise but are not required for basic stability.
What happens when MC33275D-3.3 enters thermal shutdown?
When MC33275D-3.3 junction temperature reaches ~150°C, thermal shutdown disables the output with no hysteresis. The output oscillates - turning off until temperature drops below threshold, then re-enabling - repeating until thermal equilibrium is reached. This behavior indicates inadequate heatsinking or excessive power dissipation, not device failure.
Is MC33275D-3.3 pin-compatible with other variants in the MC33275 family?
No - MC33275D-3.3 (SOIC-8) is not pin-compatible with MC33275ST-3.3T3G (SOT-223) or MC33275DT-3.3RKG (DPAK), despite sharing the same die. Pin count, pin assignment, and thermal pad configuration differ significantly; PCB layout must be redesigned for each package variant.
MC33275D-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
MC33275D-3.3 FAQ
1.How can I place an order for MC33275D-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33275D-3.3 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 MC33275D-3.3 reliable?
The price and inventory of MC33275D-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33275D-3.3 is usually 5 days.
3.What payment methods are accepted for MC33275D-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33275D-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33275D-3.3?
MC33275D-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33275D-3.3 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 MC33275D-3.3?
For technical support, including MC33275D-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33275D-3.3 requirements.
6.How does Aetrix verify that MC33275D-3.3 is sourced from the original manufacturer or authorized distributors?
All MC33275D-3.3 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 MC33275D-3.3 meets industry standards.
7.What is the process for return or replacement of MC33275D-3.3?
All MC33275D-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33275D-3.3, 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 MC33275D-3.3 part is unused and in its original packaging.
Return procedure for MC33275D-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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