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onsemi MC33375ST-5.0T3
- Part No.:
- MC33375ST-5.0T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33375ST-5.0T3.pdf
- Description:
- IC REG LINEAR 5V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,536
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Product details
Overview
MC33375ST-5.0T3 from onsemi is a 5.0 V fixed-output, 300 mA micropower low-dropout linear voltage regulator in SOT-223 package with logic-level ON/OFF control, 260 mV dropout at 300 mA, ±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-5.0T3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at full load, quiescent current in ON/OFF modes (125 µA / 0.3 µA), stability with minimal 0.22 µF output capacitance, and thermal shutdown at 150 °C without hysteresis.
Technical Context
The MC33375ST-5.0T3 uses a PNP pass transistor architecture enabling ultra-low dropout (25 mV at 10 mA; 260 mV at 300 mA) and micropower operation. Its ON/OFF control pin accepts TTL/CMOS-compatible logic levels (VCTRL ≥ 2.4 V for ON; ≤ 0.5 V for OFF), directly disabling the output stage without external circuitry.
Internal protection includes foldback current limiting (450 mA typical) and thermal shutdown at 150 °C with no hysteresis-causing output oscillation under sustained overload. It achieves ±0.01% line regulation (2.0 mV max) and ±0.025% load regulation (5.0 mV max) across its operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±2% over −40 °C to +125 °C - ensures stable supply for 5 V logic and analog circuits across automotive/industrial temperature extremes. |
| Max Output Current | 300 mA continuous - supports moderate-power microcontrollers, ADCs, and RF front-ends without external boost stages. |
| Dropout Voltage | 260 mV at 300 mA - enables operation from 5.26 V input, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 125 µA (ON), 0.3 µA (OFF) - minimizes standby power loss in always-on sensor nodes and energy-harvesting applications. |
| Output Capacitance | 0.22 µF minimum (5.0 V version) - allows use of tiny ceramic capacitors, reducing PCB area and cost versus legacy LDOs requiring ≥1 µF. |
| Ripple Rejection | 65 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC sources, critical for precision analog signal chains. |
| Thermal Shutdown | 150 °C junction - protects against solder reflow damage and sustained overloads; output cycles on/off until thermal recovery. |
Pinout & Package
SOT-223 (Case 318E) package with exposed thermal pad (pin 2 connected to GND internally); compact 6.5 mm × 3.5 mm footprint, 1.8 mm height, Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Main power input; accepts 5.26 V to 13 V - must be bypassed with ≥0.33 µF capacitor near pin for transient stability. |
| 2 (Tab/Ground) | GND | Power ground and thermal pad connection - requires direct PCB copper pour for RJA = 245 °C/W (free-air) or lower. |
| 3 (Output) | VOUT | Regulated 5.0 V output; stable with ≥0.22 µF ceramic capacitor - output impedance < 0.1 Ω ensures clean supply for noise-sensitive loads. |
| 4 (Control) | ON/OFF | Active-low enable; pulls < 0.5 V to disable regulator (VOUT < 0.03 V); must not float - tie to VIN via 100 kΩ resistor if always-on. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Level ON/OFF Control | Direct interface with MCU GPIOs (no level-shifting needed); 0.3 µA OFF-mode current eliminates need for external power switches. |
| Ultra-Low Dropout | 25 mV at 10 mA enables >99% efficiency in low-voltage battery systems - e.g., 5.025 V input sustains 5.0 V output at light load. |
| Tight Load Regulation | 5.0 mV max change from 0–300 mA load - maintains ADC reference accuracy and digital logic margins without post-regulation filtering. |
| Stable with Minimal Capacitance | 0.22 µF ceramic output cap suffices for 5.0 V version - reduces BOM count, board space, and cost vs. competitors requiring ≥1 µF. |
| Integrated Thermal Protection | 150 °C shutdown with automatic recovery - prevents permanent damage during short-circuit events or inadequate heatsinking. |
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 5 V supply for MCU, sensor IC, and RF transceiver; ON/OFF pin synchronized with measurement cycle. Use Value: 0.3 µA OFF current extends 2× AA battery life to >5 years; 260 mV dropout allows operation down to 5.26 V input until battery depletion. |
Use Scenario: Handheld ECG device using rechargeable Li-ion with sleep mode between patient readings. IC Role / Device Role / Timing Role: Clean 5 V rail for analog front-end amplifiers and 16-bit ADC; disabled during deep-sleep to minimize leakage. Use Value: 65 dB ripple rejection prevents switching noise from DC-DC charger from corrupting µV-level ECG signals. |
| Automotive Cabin Controller | Smart Energy Meter |
Use Scenario: HVAC control module powered from 12 V vehicle bus with wide input transients. IC Role / Device Role / Timing Role: Post-regulator for 5 V microcontroller and CAN transceiver; withstands load-dump and cold-crank conditions. Use Value: 13 V absolute max input rating and −40 °C to +125 °C operation meet AEC-Q100 Grade 1 requirements without derating. |
Use Scenario: M-Bus enabled electricity meter with optical port and real-time clock, operating 24/7 on utility-supplied power. IC Role / Device Role / Timing Role: Primary 5 V supply for metrology ASIC and isolated RS-485 interface; thermal shutdown prevents failure during enclosure overheating. Use Value: Internal current limit (450 mA) and thermal cutoff protect against fault currents from downstream surge events on communication lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST50T3G | 800 mA output, 1.2 V dropout at 800 mA, SO-8 package, no ON/OFF control pin. | Lacks enable functionality; requires external MOSFET for power gating - increases component count and PCB area. | Choose when higher current (>300 mA) is required and enable control is unnecessary. |
| MCP1700T-5002E/MB | 250 mA output, 175 mV dropout at 250 mA, SOT-23-5 package, 1.6 µA quiescent current in ON mode. | Lower IQ in ON mode but lacks thermal shutdown; limited to 125 °C max ambient - unsuitable for enclosed industrial enclosures. | Choose for ultra-low-power always-on applications where thermal stress is negligible and current demand ≤250 mA. |
Compared with NCP1117ST50T3G and MCP1700T-5002E/MB, the MC33375ST-5.0T3 uniquely balances 300 mA capability, sub-µA OFF current, integrated thermal shutdown, and SOT-223 thermal performance - making it optimal for thermally constrained, battery-sensitive designs requiring reliable enable control.
Availability
MC33375ST-5.0T3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and automotive cabin controllers requiring stable component supply with long-term lifecycle support.
Supply support for MC33375ST-5.0T3 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 cloud infrastructure markets.
The MC33375 series was designed specifically for micropower, low-dropout regulation in battery-constrained and thermally demanding environments - emphasizing quiescent current optimization, robust protection, and wide-temperature reliability.
FAQ
What is the maximum input voltage rating for the MC33375ST-5.0T3?
The MC33375ST-5.0T3 has an absolute maximum input voltage of 13 V DC. Exceeding this rating may cause permanent damage. For reliable operation, the recommended input range is 5.26 V to 12 V - ensuring sufficient headroom above the 5.0 V output while maintaining low dropout and thermal safety.
Does the MC33375ST-5.0T3 require an external pull-up resistor on the ON/OFF pin?
Yes - the ON/OFF pin of the MC33375ST-5.0T3 must not be left floating. When active operation is required, connect it to VIN via a 100 kΩ resistor. If controlled by a microcontroller, drive it actively high (≥2.4 V) to enable or low (≤0.5 V) to disable; no external pull-up is needed in that case.
Can the MC33375ST-5.0T3 operate stably with a 0.22 µF ceramic output capacitor?
Yes - the MC33375ST-5.0T3 is explicitly characterized and guaranteed stable with a minimum 0.22 µF ceramic output capacitor for the 5.0 V version. This value satisfies phase margin requirements across temperature and load; larger values improve PSRR but are not required for stability.
What happens during thermal shutdown of the MC33375ST-5.0T3?
When the MC33375ST-5.0T3 junction temperature reaches 150 °C, the thermal shutdown circuit disables the output. There is no hysteresis, so the output cycles ON/OFF as temperature fluctuates around the threshold - visible as output voltage oscillation. Proper PCB copper pour on pin 2 is essential to avoid repeated triggering.
Is the MC33375ST-5.0T3 pin-compatible with other SOT-223 LDOs like the LM1117?
No - the MC33375ST-5.0T3 uses a non-standard SOT-223 pinout: Pin 1 = VIN, Pin 2 = GND (tab), Pin 3 = VOUT, Pin 4 = ON/OFF. LM1117 variants use Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN - direct replacement would cause catastrophic misconnection. Layout redesign is mandatory.
MC33375ST-5.0T3 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):
- 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-5.0T3 FAQ
1.How can I place an order for MC33375ST-5.0T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33375ST-5.0T3 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-5.0T3 reliable?
The price and inventory of MC33375ST-5.0T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33375ST-5.0T3 is usually 5 days.
3.What payment methods are accepted for MC33375ST-5.0T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33375ST-5.0T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33375ST-5.0T3?
MC33375ST-5.0T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33375ST-5.0T3 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-5.0T3?
For technical support, including MC33375ST-5.0T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33375ST-5.0T3 requirements.
6.How does Aetrix verify that MC33375ST-5.0T3 is sourced from the original manufacturer or authorized distributors?
All MC33375ST-5.0T3 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-5.0T3 meets industry standards.
7.What is the process for return or replacement of MC33375ST-5.0T3?
All MC33375ST-5.0T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33375ST-5.0T3, 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-5.0T3 part is unused and in its original packaging.
Return procedure for MC33375ST-5.0T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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