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onsemi MC33375ST-1.8T3
- Part No.:
- MC33375ST-1.8T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MC33375ST-1.8T3.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
MC33375ST-1.8T3 from onsemi is a micropower, low-dropout linear voltage regulator delivering a fixed 1.8 V output at up to 300 mA, featuring logic-level ON/OFF control, 260 mV dropout at full load, and 125 µA quiescent current in active mode. It is designed for battery-powered industrial and consumer systems where extended runtime and stable low-voltage rail generation are critical.
For engineers reviewing the MC33375ST-1.8T3 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific design meaning, real-world application roles, and validated alternative options for power management subsystems requiring tight regulation and ultra-low standby current.
Technical Context
The MC33375ST-1.8T3 uses a PNP pass transistor architecture enabling ultra-low dropout (25 mV at 10 mA) and stable operation with only 0.33 µF output capacitance. Its internal thermal shutdown activates at 150 °C and current limit is set to 450 mA, providing robust protection without external components.
Logic-level ON/OFF control operates with VCTRL ≤ 0.3 V for turn-off (ensuring VOUT < 0.05 V for the 1.8 V version) and ≥ 2.4 V for turn-on. Line regulation is 2.0 mV typical over 1.0–12 V input range, and load regulation is 5.0 mV typical across 0–250 mA load variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.80 V ±2% over −40 °C to +125 °C - ensures stable core logic supply for 1.8 V microcontrollers and FPGAs under wide temperature and load conditions. |
| Max Output Current | 300 mA - sufficient to power multiple low-power peripherals or an entire sensor node without external boost circuitry. |
| Dropout Voltage | 260 mV at 300 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) sources while maintaining regulation. |
| Quiescent Current | 125 µA (ON), 0.3 µA (OFF) - extends battery life in sleep-mode applications such as wireless sensors and portable medical devices. |
| Input Voltage Range | 2.5 V to 13 V - accommodates common battery chemistries and intermediate bus rails while avoiding overvoltage stress. |
| Ripple Rejection | 65 dB at 120 Hz - suppresses AC ripple from switching pre-regulators or noisy DC sources, preserving signal integrity in analog/RF sections. |
| Thermal Shutdown | 150 °C - protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring. |
Pinout & Package
SOT-223 (Case 318E) package with exposed thermal pad (pin 2) for enhanced heat dissipation; footprint compatible with standard SOT-223 land patterns and supports >1 W power handling when mounted on ≥10 mm² of 2 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | VIN | Main power input; must be decoupled with ≥0.33 µF capacitor close to pin to ensure stability and transient response. |
| 2 (Ground) | GND | Power ground reference; electrically connected to exposed thermal pad - must be soldered to large copper pour for thermal performance. |
| 3 (Output) | VOUT | Regulated 1.8 V output; requires ≥0.33 µF ceramic or tantalum capacitor directly at pin for loop stability per datasheet Figure 23. |
| 4 (Control) | ON/OFF | Active-high enable: ≥2.4 V turns regulator on; ≤0.3 V forces output to <0.05 V - must not float; pull-up required for default-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout at light load | 25 mV at 10 mA - enables efficient operation even when input drops near output voltage, e.g., in end-of-battery-life scenarios. |
| Stable with minimal output capacitance | 0.33 µF - reduces BOM count and board space versus LDOs requiring ≥10 µF, ideal for compact portable designs. |
| Ultra-low OFF-mode current | 0.3 µA - eliminates parasitic drain during system sleep, critical for multi-year battery life in IoT endpoints. |
| Integrated protection | Current limit (450 mA) + thermal shutdown (150 °C) - removes need for external foldback or thermal sensors in most embedded applications. |
| Logic-compatible enable | 0.3 V / 2.4 V thresholds - interfaces directly with 1.8 V or 3.3 V GPIO without level-shifting, simplifying MCU-controlled power sequencing. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor using ultra-low-power MCU and analog front-end powered by coin cell. IC Role / Device Role / Timing Role: Primary 1.8 V supply regulator with ON/OFF controlled by MCU to gate power to RF transceiver during sleep cycles. Use Value: 0.3 µA OFF current prevents measurable battery depletion over months of standby; 260 mV dropout allows operation down to 2.06 V input. |
Use Scenario: DIN-rail mounted sensor interface module operating in −40 °C to +85 °C ambient with isolated 1.8 V digital logic rail. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5 V backplane to clean 1.8 V for FPGA configuration and serial interface ICs. Use Value: ±2% output tolerance over full temperature range ensures reliable FPGA startup; thermal shutdown prevents field failure due to enclosure overheating. |
| Wireless Sensor Nodes | Automotive Body Control Units |
Use Scenario: LoRaWAN node with sub-GHz transceiver, accelerometer, and flash memory, powered by AA batteries. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep mode via ON/OFF pin synchronized with radio transmit/receive windows. Use Value: 125 µA quiescent current minimizes average system current; 65 dB PSRR suppresses switching noise from DC-DC converter feeding VIN. |
Use Scenario: Door module controlling window lift, mirror adjustment, and LED status indicators in 12 V automotive electrical system. IC Role / Device Role / Timing Role: Secondary regulator supplying 1.8 V to CAN transceiver logic and microcontroller I/O banks. Use Value: AEC-Q100 qualified NCV variants exist; this MC33375ST-1.8T3 shares identical electrical specs and pinout - suitable for non-safety-critical subfunctions. |
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 |
|---|---|---|---|
| NCP1117ST18T3G | Higher dropout (1.1 V at 1 A), higher IQ (6 mA), SO-8/SOT-223 dual package - no ON/OFF pin. | Lacks enable control; unsuitable for duty-cycled systems; better for high-current, always-on rails. | Select when cost-per-amp matters more than quiescent current or enable functionality. |
| MCP1700T-1802E/MB | Lower IQ (1.6 µA OFF, 2.4 µA ON), 250 mA max, SOT-23-5 - includes ON/OFF but no thermal shutdown. | No internal thermal protection; limited to <150 mW dissipation; requires careful thermal design. | Select for ultra-low-power, low-current applications where thermal margin is guaranteed and board space is constrained. |
Compared with NCP1117ST18T3G and MCP1700T-1802E/MB, the MC33375ST-1.8T3 uniquely balances 300 mA capability, 0.3 µA OFF current, integrated thermal/current protection, and logic-level enable - making it optimal for battery-operated systems needing both high peak current and deep sleep efficiency.
Availability
MC33375ST-1.8T3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless sensor nodes, and automotive body control units requiring stable component supply with long-term lifecycle assurance.
Supply support for MC33375ST-1.8T3 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, cloud, and medical markets.
The MC33375 series was developed specifically for battery-powered and thermally constrained applications demanding micropower operation, precise low-voltage regulation, and integrated fault protection - targeting portable instrumentation and embedded control systems.
FAQ
What is the minimum input voltage required for MC33375ST-1.8T3 to regulate at full 300 mA load?
The MC33375ST-1.8T3 requires a minimum input voltage of 2.06 V to maintain regulation at 300 mA, based on its maximum dropout voltage of 260 mV (1.8 V + 0.26 V). Datasheet Note 3 confirms the 1.8 V version is constrained by a 2.5 V absolute minimum input rating, so operation below 2.5 V is not recommended despite theoretical dropout margin.
Can MC33375ST-1.8T3 be used with ceramic output capacitors?
Yes, MC33375ST-1.8T3 is stable with ceramic output capacitors ≥0.33 µF, as confirmed in the Applications Information section. Multilayer ceramic capacitors (MLCCs) are explicitly recommended, and Figure 24 shows ESR stability boundaries applicable to the 1.8 V variant when paired with 1.0 µF output capacitance.
Does MC33375ST-1.8T3 include reverse polarity protection?
No, MC33375ST-1.8T3 does not include reverse polarity protection. The device lacks internal diode or circuitry to block reverse voltage applied to VIN. External protection (e.g., series Schottky diode or MOSFET-based reverse-voltage circuit) must be added if system-level reverse input is possible.
What is the thermal resistance (RJA) of MC33375ST-1.8T3 in standard SOT-223 layout?
For the MC33375ST-1.8T3 in SOT-223 (Case 318E), the typical junction-to-air thermal resistance (RJA) is 245 °C/W with minimum copper pad, improving to ~90 °C/W with 10 mm × 10 mm 2 oz copper per Figure 25. This value determines maximum allowable power dissipation before thermal shutdown at 150 °C junction temperature.
Is MC33375ST-1.8T3 pin-compatible with other output voltage versions in the same series?
Yes, all MC33375ST-x.xT3 variants (including MC33375ST-1.8T3, MC33375ST-2.5T3G, etc.) share identical SOT-223 pinout and package dimensions. Voltage selection is internal and fixed per part number - no external resistor network is needed, enabling drop-in replacement across output voltages in the same footprint.
MC33375ST-1.8T3 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):
- 1.8V
- 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-1.8T3 FAQ
1.How can I place an order for MC33375ST-1.8T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33375ST-1.8T3 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-1.8T3 reliable?
The price and inventory of MC33375ST-1.8T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33375ST-1.8T3 is usually 5 days.
3.What payment methods are accepted for MC33375ST-1.8T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33375ST-1.8T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33375ST-1.8T3?
MC33375ST-1.8T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33375ST-1.8T3 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-1.8T3?
For technical support, including MC33375ST-1.8T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33375ST-1.8T3 requirements.
6.How does Aetrix verify that MC33375ST-1.8T3 is sourced from the original manufacturer or authorized distributors?
All MC33375ST-1.8T3 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-1.8T3 meets industry standards.
7.What is the process for return or replacement of MC33375ST-1.8T3?
All MC33375ST-1.8T3 units undergo pre-shipment inspection (PSI). If there is an issue with MC33375ST-1.8T3, 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-1.8T3 part is unused and in its original packaging.
Return procedure for MC33375ST-1.8T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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