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onsemi MC33275ST-2.5T3
- Part No.:
- MC33275ST-2.5T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33275ST-2.5T3.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,024
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Product details
Overview
MC33275ST-2.5T3 from onsemi is a micropower low-dropout linear voltage regulator delivering a fixed 2.5 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 stable with only 0.33 µF output capacitance - ideal for battery-powered handheld instruments and camcorders requiring extended runtime.
For engineers reviewing the MC33275ST-2.5T3 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-223 package thermal performance, 2% output voltage tolerance over temperature, quiescent current of 125 µA (typ), and compatibility with low-ESR ceramic/tantalum capacitors in space-constrained portable designs.
Technical Context
The MC33275ST-2.5T3 employs a PNP pass transistor architecture enabling ultra-low dropout operation and tight line/load regulation (≤2.0 mV and ≤5.0 mV respectively). Its internal reference is trimmed to 1.23 V, and feedback network sets nominal output to 2.5 V with ±2% tolerance over −40°C to +125°C junction temperature.
Thermal shutdown activates at 150°C with no hysteresis, causing output oscillation until junction cools below threshold; current limit is internally set to 450 mA. The device requires no external compensation and remains stable with output capacitors ≥0.33 µF and ESR <1 Ω across load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% over −40°C to +125°C - ensures stable logic supply for 2.5 V I/O domains without external trimming. |
| Max Output Current | 300 mA - sufficient to power microcontrollers, sensors, and analog front-ends in portable equipment. |
| 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) with margin. |
| Quiescent Current | 125 µA (typ) at 0 mA load - minimizes standby power loss in battery-critical applications. |
| Line Regulation | ≤2.0 mV change over Vin = VO+1 V to 12 V - maintains precision under varying input conditions (e.g., decaying battery). |
| Load Regulation | ≤5.0 mV change over 0–250 mA load - preserves voltage accuracy across dynamic load profiles. |
| Ripple Rejection | 65 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC sources. |
| Stability Capacitance | 0.33 µF ceramic/tantalum - eliminates need for large bulk caps, reducing PCB area and BOM count. |
Pinout & Package
SOT-223 package (Case 318E), surface-mount, thermally enhanced with exposed collector pad (pin 2) tied to GND for improved heat dissipation. Pin 4 is not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Vin) | Regulator input; accepts 2.75 V to 13 V - must be ≥ VO + dropout for regulation. |
| 2 | GND / Exposed Pad | Ground reference and primary thermal path - requires soldered copper pour for thermal management. |
| 3 | Output (Vout) | Stable 2.5 V regulated output; connects directly to load and local bypass capacitor. |
| 4 | NC | No internal connection - left floating or grounded per layout best practice; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 25 mV at 10 mA enables operation near battery end-of-discharge (e.g., 2.525 V input still regulates). |
| Micropower operation | 125 µA quiescent current extends shelf life and runtime in always-on sensor nodes. |
| Internal protection | Current limit (450 mA) and thermal shutdown (150°C) prevent damage during fault conditions without external circuitry. |
| Minimal external components | Stable with 0.33 µF output cap - reduces bill-of-materials and layout complexity vs. legacy LDOs. |
| Wide temperature range | −40°C to +125°C operation supports industrial and automotive-adjacent environments. |
| Pb-free construction | RoHS-compliant SOT-223 package meets global environmental compliance requirements. |
Applications
| Hand-Held Instruments | Camcorders and Cameras |
|---|---|
|
Use Scenario: Portable multimeters, thermal imagers, and handheld spectrum analyzers operating from 2×AA/AAA or Li-ion cells. IC Role / Device Role: Primary 2.5 V supply for ADC reference, microcontroller core, and precision analog signal chain. Use Value: Low dropout preserves regulation down to 2.75 V input, extending usable battery capacity by >15% versus standard LDOs. |
Use Scenario: Image sensor biasing and digital video processing in consumer camcorders with compact form factor. IC Role / Device Role: Clean 2.5 V rail for CMOS image sensor I/O and FPGA configuration memory. Use Value: 65 dB ripple rejection suppresses switching noise from DC-DC converters, preventing image artifacts and color banding. |
| Battery-Powered Consumer Products | Industrial Data Loggers |
|
Use Scenario: Wireless remote controls, smart thermostats, and Bluetooth audio accessories powered by coin cells or small Li-po packs. IC Role / Device Role: Always-on 2.5 V supply for real-time clock, BLE SoC, and wake-up circuitry. Use Value: 125 µA quiescent current enables multi-year operation on CR2032, meeting UL/IEC long-life requirements. |
Use Scenario: Ruggedized environmental monitors deployed in unattended outdoor locations with wide ambient temperature swings. IC Role / Device Role: Regulated 2.5 V source for precision temperature/humidity sensors and low-power MCU sleep modes. Use Value: Guaranteed operation from −40°C to +125°C ambient ensures reliability in extreme field deployments without derating. |
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 |
|---|---|---|---|
| NCP1117ST25T3G | Higher dropout (1.1 V typ at 1 A), higher IQ (6 mA), SO-8/SOT-223 options - less efficient at light loads. | Targeted at higher-current (up to 1 A) applications where thermal headroom allows larger package. | Choose when >300 mA output or SO-8 footprint compatibility is required; avoid for micropower battery use. |
| TPS73225DBVR | Lower IQ (250 nA typ), tighter initial accuracy (±0.5%), but requires 1 µF minimum output cap and costs ~2.5× more. | Preferred for ultra-low-power IoT endpoints where nanowatt standby dominates design priority. | Choose for sub-µA standby systems; MC33275ST-2.5T3 offers better cost-performance balance for 100–300 µA typical use. |
Compared with NCP1117ST25T3G and TPS73225DBVR, the MC33275ST-2.5T3 delivers optimal trade-off between micropower efficiency (125 µA), low dropout (260 mV), and cost-sensitive SOT-223 packaging - making it the preferred choice for mid-tier portable electronics requiring robustness and longevity without premium pricing.
Availability
MC33275ST-2.5T3 is available at Aetrix Electronics and suitable for battery-powered consumer products, handheld instruments, and industrial data loggers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MC33275ST-2.5T3 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 was designed specifically for battery-powered portable equipment demanding micropower operation, ultra-low dropout, and high reliability across extended temperature ranges - aligning with onsemi's focus on robust, application-optimized analog ICs.
FAQ
What is the maximum input voltage rating for MC33275ST-2.5T3?
The MC33275ST-2.5T3 has an absolute maximum input voltage of 13 Vdc, as specified in the Maximum Ratings table. Operation above this level risks permanent damage. For reliable 2.5 V regulation, input must remain ≥2.75 V (2.5 V + 250 mV dropout margin) across all load and temperature conditions.
Does MC33275ST-2.5T3 require an input bypass capacitor?
Yes - an input bypass capacitor of ≥0.33 µF (tantalum, ceramic, or mylar) is recommended, especially when the regulator is connected via long traces (>4 inches) to the power source. This improves transient response and reduces sensitivity to high-frequency input impedance, ensuring stable regulation under dynamic load changes.
Can MC33275ST-2.5T3 be used with ceramic output capacitors?
Yes - the MC33275ST-2.5T3 is explicitly characterized for stability with multilayer ceramic capacitors ≥0.33 µF. Its internal compensation does not require ESR, unlike older LDOs; however, ensure capacitor voltage rating exceeds max input (13 V) and consider derating for temperature effects.
What happens when MC33275ST-2.5T3 enters thermal shutdown?
When junction temperature reaches ~150°C, MC33275ST-2.5T3 disables output with no hysteresis. As temperature drops below threshold, output re-enables - causing visible oscillation in output voltage under sustained overload. This is intentional behavior; proper PCB copper pour on pin 2 is required to avoid repeated cycling.
Is MC33275ST-2.5T3 qualified for automotive applications?
No - MC33275ST-2.5T3 is not AEC-Q100 qualified. For automotive use, select the NCV33275ST-2.5T3G variant, which shares identical electrical specs but includes PPAP capability, unique site control, and automotive-grade qualification per AEC-Q100 Rev H.
MC33275ST-2.5T3 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):
- 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:
- SOT-223 (TO-261)
MC33275ST-2.5T3 FAQ
1.How can I place an order for MC33275ST-2.5T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33275ST-2.5T3 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-2.5T3 reliable?
The price and inventory of MC33275ST-2.5T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33275ST-2.5T3 is usually 5 days.
3.What payment methods are accepted for MC33275ST-2.5T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33275ST-2.5T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33275ST-2.5T3?
MC33275ST-2.5T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33275ST-2.5T3 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-2.5T3?
For technical support, including MC33275ST-2.5T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33275ST-2.5T3 requirements.
6.How does Aetrix verify that MC33275ST-2.5T3 is sourced from the original manufacturer or authorized distributors?
All MC33275ST-2.5T3 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-2.5T3 meets industry standards.
7.What is the process for return or replacement of MC33275ST-2.5T3?
All MC33275ST-2.5T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33275ST-2.5T3, 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-2.5T3 part is unused and in its original packaging.
Return procedure for MC33275ST-2.5T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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