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onsemi MC33275D-2.5R2
- Part No.:
- MC33275D-2.5R2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33275D-2.5R2.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
MC33275D-2.5R2 from onsemi is a fixed-output 2.5 V, 300 mA micropower low-dropout (LDO) voltage regulator in SOIC-8 package. It delivers ultra-low dropout (25 mV at 10 mA; 260 mV at 300 mA), tight line/load regulation (<10 mV), and stable operation with only 0.33 µF output capacitance - ideal for battery-powered handheld instruments requiring extended runtime and low-noise supply.
For engineers reviewing the MC33275D-2.5R2 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage vs. load current, thermal shutdown threshold (150°C), quiescent current (125 µA typ), and compatibility with low-ESR ceramic/tantalum output capacitors.
Technical Context
This LDO employs a PNP pass transistor architecture enabling sub-100 mV dropout at light loads and robust performance across −40°C to +125°C ambient. Internal protection includes current limiting (450 mA typ) and thermal shutdown without hysteresis, causing output toggling above 150°C junction temperature.
It operates with input voltages up to 13 V and maintains regulation down to VO + 0.26 V at full 300 mA load. Output noise is 46 µVrms (10 Hz–100 kHz, CL = 200 µF), and ripple rejection exceeds 65 dB at 120 Hz - critical for noise-sensitive analog and mixed-signal subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.50 V ±2% over −40°C to +125°C - ensures stable logic-level supply for 2.5 V microcontrollers and sensors. |
| Max Output Current | 300 mA continuous - sufficient for powering multiple low-power ICs on compact PCBs. |
| 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) without brownout. |
| Quiescent Current | 125 µA typical - extends battery life in always-on monitoring devices beyond 1 year on coin cells. |
| Ripple Rejection | ≥65 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or inadequate heatsinking in enclosed enclosures. |
| Stability Capacitor | 0.33 µF min (ceramic/tantalum) - allows use of small, low-cost MLCCs without external compensation. |
Pinout & Package
MC33275D-2.5R2 uses SOIC-8 (Case 751, D suffix), 4.9 mm × 3.9 mm × 1.5 mm body, Pb-free, with exposed pad not electrically connected. Thermal resistance: RJA = 160°C/W (no copper pour), RJC = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Main power input; accepts 2.75 V to 13 V - must be bypassed with ≥0.33 µF capacitor near pin. |
| 2 (N/C) | No Connect | Internally unconnected; no routing or grounding required - simplifies layout and avoids noise coupling. |
| 3 (N/C) | No Connect | Internally unconnected; floating per datasheet - leave unconnected on PCB. |
| 4 (GND) | Ground | Power ground reference; tie directly to low-impedance system ground plane for stability and noise immunity. |
| 5 (N/C) | No Connect | Internally unconnected; no function - do not route or connect. |
| 6 (Output) | VOUT | Regulated 2.5 V output; place 0.33 µF capacitor within 5 mm for guaranteed stability. |
| 7 (N/C) | No Connect | Internally unconnected; no electrical role - leave open. |
| 8 (GND) | Ground | Second ground terminal; connect to same ground net as Pin 4 to reduce ground loop impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 25 mV at 10 mA load - enables regulation from weak batteries down to 2.525 V input. |
| Tight load regulation | ≤25 mV change from 0–250 mA - maintains consistent voltage for ADC references and precision analog stages. |
| Low-noise operation | 46 µVrms output noise (10 Hz–100 kHz) - suitable for RF front-ends and audio codec supplies. |
| Internal protection | Current limit (450 mA) + thermal shutdown (150°C) - eliminates need for external foldback or thermal sensors. |
| Pb-free & AEC-Q100 capable | RoHS-compliant SOIC-8; NCV variant qualified for automotive - supports industrial and automotive BOM reuse. |
Applications
| Hand-Held Instruments | Camcorders and Cameras |
|---|---|
Use Scenario: Portable multimeter or thermal imaging probe powered by two AA batteries. IC Role / Device Role / Timing Role: Primary 2.5 V supply for MCU, display driver, and analog front-end. Use Value: 125 µA quiescent current extends battery life >18 months; 260 mV dropout sustains regulation until battery drops to 2.76 V. |
Use Scenario: Image sensor bias and ISP core supply in compact camcorder. IC Role / Device Role / Timing Role: Clean 2.5 V rail for CMOS image sensor analog chain and low-jitter clock generator. Use Value: 46 µVrms noise prevents fixed-pattern noise in captured images; 65 dB ripple rejection blocks DC/DC switching artifacts. |
| Battery-Powered Consumer Products | Industrial Sensor Nodes |
Use Scenario: Wireless smart thermostat using CR2032 coin cell. IC Role / Device Role / Timing Role: Regulated 2.5 V source for BLE SoC, temperature/humidity sensor, and LCD. Use Value: 0.33 µF stability requirement allows tiny 0402 MLCC; 2.5 V output matches common sensor I/O voltage. |
Use Scenario: Loop-powered 4–20 mA transmitter with local 2.5 V ADC reference. IC Role / Device Role / Timing Role: Precision voltage reference supply decoupled from noisy 24 V loop supply. Use Value: ±2% output tolerance over −40°C to +125°C ensures <0.5% measurement drift; thermal shutdown prevents field failure during ambient spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | 250 mA max output; 1.6 µA quiescent current; SOT-23-5 package. | Lower IQ suits ultra-low-power wake-on-event designs; lower current limits use in sensor-only rails. | Select when battery life >5 years is mandatory and load ≤200 mA; requires different footprint and layout. |
| NCP1117ST2.5T3G | 1 A output; 6 mV/mA load regulation; TO-220/SOT-223; higher dropout (1.2 V). | Higher current and thermal mass suit industrial controllers; less suitable for space-constrained portable gear. | Choose for high-current, non-battery applications where board area and thermal margin allow larger package. |
Compared with MCP1700T-2502E/TT, MC33275D-2.5R2 delivers 20% more output current and better transient response but consumes ~80× more quiescent current; versus NCP1117ST2.5T3G, it offers 80% lower dropout and 4× smaller footprint at the cost of 30% lower current rating.
Availability
MC33275D-2.5R2 is available at Aetrix Electronics and suitable for battery-powered consumer products, handheld instruments, and industrial sensor nodes requiring stable component supply with long-term manufacturability and RoHS compliance.
Supply support for MC33275D-2.5R2 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 cloud infrastructure markets.
The MC33275 series belongs to onsemi's precision LDO portfolio, engineered for ultra-low dropout and micropower operation in portable and battery-critical systems - emphasizing longevity, reliability, and wide-temperature performance.
FAQ
What is the minimum input voltage required for MC33275D-2.5R2 to maintain regulation at 300 mA?
The MC33275D-2.5R2 requires VIN ≥ VOUT + dropout voltage. At 300 mA, dropout is 260 mV (max), so minimum input is 2.5 V + 0.26 V = 2.76 V. Below this, output voltage drops linearly with input - confirmed in Figure 7 of the datasheet.
Can MC33275D-2.5R2 operate with a 0.22 µF output capacitor?
No. The MC33275D-2.5R2 requires ≥0.33 µF for 2.5 V output (per Applications Information section). A 0.22 µF capacitor may cause instability or oscillation - only 5.0 V versions accept 0.22 µF. Use 0.33 µF X7R ceramic placed within 5 mm of pins 4 and 6.
Does MC33275D-2.5R2 have reverse polarity protection?
No. The MC33275D-2.5R2 lacks internal reverse-voltage protection. Applying negative voltage to VIN or VOUT can damage the device. External protection (e.g., series diode or MOSFET) is required if reverse input is possible in the system.
How does thermal shutdown behave in MC33275D-2.5R2 under sustained overload?
MC33275D-2.5R2 thermal shutdown activates at ~150°C junction temperature with no hysteresis. Output disables, cools, re-enables, and repeats - appearing as output oscillation. This is intentional behavior (per page 8); proper PCB copper pour or heatsinking is required to avoid cycling.
Is MC33275D-2.5R2 pin-compatible with other SOIC-8 LDOs like MIC5205-2.5YM?
No. MC33275D-2.5R2 has unique pinout: Pins 1 (VIN), 4 & 8 (GND), 6 (VOUT), and five NC pins. MIC5205-2.5YM uses Pin 1 (EN), Pin 2 (GND), Pin 3 (VIN), Pin 4 (VOUT), Pin 5 (NC), Pin 6 (GND), Pin 7 (NC), Pin 8 (NC) - incompatible layout and function.
MC33275D-2.5R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 2.5V
- 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-2.5R2 FAQ
1.How can I place an order for MC33275D-2.5R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33275D-2.5R2 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-2.5R2 reliable?
The price and inventory of MC33275D-2.5R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33275D-2.5R2 is usually 5 days.
3.What payment methods are accepted for MC33275D-2.5R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33275D-2.5R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33275D-2.5R2?
MC33275D-2.5R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33275D-2.5R2 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-2.5R2?
For technical support, including MC33275D-2.5R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33275D-2.5R2 requirements.
6.How does Aetrix verify that MC33275D-2.5R2 is sourced from the original manufacturer or authorized distributors?
All MC33275D-2.5R2 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-2.5R2 meets industry standards.
7.What is the process for return or replacement of MC33275D-2.5R2?
All MC33275D-2.5R2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33275D-2.5R2, 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-2.5R2 part is unused and in its original packaging.
Return procedure for MC33275D-2.5R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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