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onsemi MC33375ST-2.5T3
- Part No.:
- MC33375ST-2.5T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33375ST-2.5T3.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
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Product details
Overview
MC33375ST-2.5T3 from onsemi is a micropower, low-dropout linear voltage regulator delivering a fixed 2.5 V output at up to 300 mA, featuring logic-level ON/OFF control, 260 mV dropout at full load, ±2% output tolerance over −40 °C to +125 °C, and internal thermal/current limiting-designed for battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the MC33375ST-2.5T3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 300 mA, quiescent current in ON/OFF modes, stability with minimal 0.33 µF output capacitance, and SOT-223 thermal characteristics for constrained PCB layouts.
Technical Context
The MC33375ST-2.5T3 uses a PNP pass transistor architecture enabling ultra-low dropout (25 mV at 10 mA) and stable operation with only 0.33 µF ceramic output capacitance. Its ON/OFF control pin accepts TTL/CMOS logic levels to disable output and reduce quiescent current to 0.3 µA.
Internal protection includes foldback current limiting (450 mA typical) and thermal shutdown at 150 °C without hysteresis, causing output cycling under sustained overload-requiring external heatsinking or layout optimization per Figure 25 for SOT-223 power dissipation limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.50 V ±2% over −40 °C to +125 °C - ensures stable reference for ADCs and microcontrollers across automotive/industrial temperature ranges. |
| Dropout Voltage | 260 mV at 300 mA - enables regulation from 2.76 V input, critical for single-cell Li-ion or 3.3 V rail post-regulation. |
| Quiescent Current | 125 µA in ON mode, 0.3 µA in OFF mode - extends battery life in always-on sensor nodes with periodic wake-up cycles. |
| Line Regulation | ≤10 mV over 3.5–12 V input - maintains tight output accuracy despite supply rail sag in battery discharge profiles. |
| Load Regulation | ≤25 mV from 0–250 mA - supports consistent analog front-end biasing during dynamic load transients. |
| Ripple Rejection | ≥65 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC-DC outputs feeding the LDO. |
| Stability Capacitance | 0.33 µF minimum ceramic - eliminates need for large tantalum capacitors, reducing BOM cost and board area in space-constrained designs. |
Pinout & Package
SOT-223 (Case 318E), surface-mount package with exposed thermal pad; pin 1 = Input, pin 2 = Ground, pin 3 = Output, pin 4 = ON/OFF control (active-low).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Unregulated input supply; must be ≥2.76 V for 300 mA output at 2.5 V; requires local 0.33 µF bypass capacitor. |
| 2 (Ground) | GND | Power ground return; connects to thermal pad for heat dissipation; must be low-impedance plane for stability. |
| 3 (Output) | VOUT | Regulated 2.5 V output; drives load directly; output capacitor (≥0.33 µF) must be placed adjacent to this pin. |
| 4 (ON/OFF) | Control | Active-low enable; <0.5 V disables regulator (IQ ≈ 0.3 µA); >2.4 V enables; must not float-tie to VIN or MCU GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-level ON/OFF control | Direct interface with 3.3 V or 5 V microcontrollers without level-shifting; enables system-level power gating. |
| Ultra-low quiescent current | 125 µA active, 0.3 µA shutdown - reduces standby power in battery-operated devices by >99% versus standard LDOs. |
| Low dropout at full load | 260 mV @ 300 mA - allows operation from marginal input rails where higher-dropout regulators fail. |
| Minimal external components | Stable with 0.33 µF ceramic output cap - eliminates ESR requirements and simplifies layout vs. traditional LDOs. |
| Integrated protection | Thermal shutdown at 150 °C and current limit at 450 mA - prevents damage during short-circuit or overtemperature events without external circuitry. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Primary 2.5 V supply for precision analog front-end and low-power MCU core. Use Value: 0.3 µA shutdown current extends 2×AA battery life to >2 years; 260 mV dropout enables operation until battery drops to 2.76 V. | Use Scenario: Handheld ECG device with real-time signal processing and OLED display. IC Role / Device Role / Timing Role: Clean 2.5 V rail for 16-bit ADC reference and op-amp signal conditioning. Use Value: 65 dB ripple rejection suppresses switching noise from display DC-DC converter; ±2% tolerance ensures measurement accuracy. |
| Automotive Body Control Module | Smart Home Hub Power Management |
Use Scenario: Low-power CAN node monitoring door lock status and interior lighting. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 5 V vehicle bus for microcontroller I/O and CAN transceiver. Use Value: AEC-Q100 qualified NCV variants available; thermal shutdown protects against under-hood ambient spikes up to +125 °C. | Use Scenario: Always-on Wi-Fi hub with voice assistant, requiring low-noise power for audio codec and RF section. IC Role / Device Role / Timing Role: Dedicated low-noise 2.5 V LDO for audio DAC and microphone bias circuitry. Use Value: 160 µVRMS output noise (10 Hz–100 kHz) minimizes audible hiss; 0.33 µF stability enables compact 2-layer PCB design. |
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 |
|---|---|---|---|
| NCV33375ST-2.5T3G | AEC-Q100 qualified, PPAP-capable, identical electrical specs and SOT-223 package. | Required for automotive body electronics with strict qualification and traceability mandates. | Select when automotive-grade reliability, change control, and manufacturing site compliance are mandatory. |
| MCP1700T-2502E/MB | 250 mA max output, 1.6 µA quiescent current in ON mode, SOT-23-5 package, no ON/OFF pin. | Limited current capability and no enable control; suited for ultra-low-power sub-100 mA loads only. | Choose only for space-constrained, sub-100 mA applications where enable functionality is unnecessary and lowest IQ is prioritized. |
Compared with NCV33375ST-2.5T3G, the MC33375ST-2.5T3 offers identical performance but lacks automotive qualification-making it suitable for industrial and consumer use. Versus MCP1700T-2502E/MB, it delivers 20% higher output current and integrated ON/OFF control, at the cost of larger SOT-223 footprint and higher ON-mode IQ.
Availability
MC33375ST-2.5T3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and smart home hubs requiring stable component supply with long-term manufacturability and Pb-free compliance.
Supply support for MC33375ST-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 cloud infrastructure markets.
The MC33375 series was designed specifically for battery-powered and thermally constrained applications demanding micropower operation, low dropout, and robust protection-targeting portable instrumentation, automotive subsystems, and IoT edge nodes.
FAQ
What is the maximum input voltage rating for the MC33375ST-2.5T3?
The MC33375ST-2.5T3 has an absolute maximum input voltage of 13 Vdc, as specified in the Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 2.5 V output at 300 mA, the recommended minimum input is 2.76 V (2.5 V + 260 mV dropout), with typical operation between 3.0 V and 12 V.
Does the MC33375ST-2.5T3 require an external pull-up resistor on the ON/OFF pin?
Yes-the ON/OFF pin of the MC33375ST-2.5T3 must not be left floating. It requires a pull-up resistor to VIN (or a compatible logic-high source) to ensure reliable enablement. A 100 kΩ resistor is commonly used; the pin draws negligible current, so higher values are acceptable if noise immunity permits.
Can the MC33375ST-2.5T3 operate stably with a 0.22 µF output capacitor?
No-the MC33375ST-2.5T3 requires a minimum of 0.33 µF ceramic output capacitance for stability at 2.5 V output, as explicitly stated in the Applications Information section. Using 0.22 µF may cause oscillation or poor transient response; 0.33 µF or greater is mandatory for all 1.8 V, 2.5 V, 3.0 V, and 3.3 V versions.
What is the thermal shutdown behavior of the MC33375ST-2.5T3 under continuous overload?
The MC33375ST-2.5T3 thermal shutdown activates at ~150 °C with no hysteresis. Under sustained overload, the device cycles-shutting off when junction temperature reaches threshold, then re-enabling as it cools-causing visible output oscillation. This is not latch-off behavior; proper PCB copper area (per Figure 25) or heatsinking is required to avoid repeated cycling.
Is the MC33375ST-2.5T3 pin-compatible with the SOIC-8 variant MC33375D-2.5R2G?
No-the MC33375ST-2.5T3 uses SOT-223 (4-pin) packaging, while MC33375D-2.5R2G uses SOIC-8 (8-pin). They share identical electrical specifications but differ in pin count, pinout, thermal performance, and footprint. PCB redesign is required for substitution; they are functionally equivalent but not pin-compatible.
MC33375ST-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:
- Enable
- 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)
MC33375ST-2.5T3 FAQ
1.How can I place an order for MC33375ST-2.5T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33375ST-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 MC33375ST-2.5T3 reliable?
The price and inventory of MC33375ST-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 MC33375ST-2.5T3 is usually 5 days.
3.What payment methods are accepted for MC33375ST-2.5T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33375ST-2.5T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33375ST-2.5T3?
MC33375ST-2.5T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33375ST-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 MC33375ST-2.5T3?
For technical support, including MC33375ST-2.5T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33375ST-2.5T3 requirements.
6.How does Aetrix verify that MC33375ST-2.5T3 is sourced from the original manufacturer or authorized distributors?
All MC33375ST-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 MC33375ST-2.5T3 meets industry standards.
7.What is the process for return or replacement of MC33375ST-2.5T3?
All MC33375ST-2.5T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33375ST-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 MC33375ST-2.5T3 part is unused and in its original packaging.
Return procedure for MC33375ST-2.5T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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