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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7375-33SA-7

Name: AP7375-33SA-7
Brand: Diodes Incorporated
SKU: AP7375-33SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7375-33SA-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AP7375-33SA-7.pdf

Description:: IC REG LIN 3.3V 300MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:203

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Product details

Overview

AP7375-33SA-7 from Diodes Incorporated is a 3.3V fixed-output, wide-input (3–45V), 300mA ultra-low-dropout linear regulator in SOT23-3 package, featuring 2.1μA quiescent current, 35mV dropout at 10mA, and integrated enable pin rated to 45V. It delivers stable power to microcontrollers and sensors in battery-powered smoke detectors.

For engineers reviewing the AP7375-33SA-7 datasheet, AP7375-33SA-7 pinout, AP7375-33SA-7 application, or AP7375-33SA-7 equivalent, key selection criteria include input voltage range up to 45V, ±2% output accuracy, thermal shutdown behavior, PSRR of 85dB at 1kHz, and compatibility with 1μF input / 10μF output ceramic capacitors.

Technical Context

The AP7375-33SA-7 employs a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR. Its EN pin accepts up to 45V directly-eliminating external level-shifting circuitry for high-side enable control in automotive or industrial supply rails.

Internal protection includes foldback current limiting (500mA typical) and thermal shutdown at +150°C with +20°C hysteresis. Fast transient response ensures no overshoot during startup or short-circuit recovery, verified under 10–300mA load steps with 200μs settling time.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3V to 45V - supports direct connection to 12V/24V/36V industrial or automotive batteries without pre-regulation.
Output Voltage	3.3V ±2% - meets tight tolerance requirements for MCU I/O and sensor analog supply rails.
Max Output Current	300mA - sufficient for ARM Cortex-M0+ microcontrollers with peripherals active.
Dropout Voltage	35mV @ 10mA / 350mV @ 100mA - enables regulation down to VIN = VOUT + 0.35V at full load.
Quiescent Current	2.1μA (typ.) - extends battery life in always-on smoke detectors beyond 10 years on CR123A cells.
PSRR	85dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Thermal Shutdown	+150°C with +20°C hysteresis - prevents latch-up during sustained overload or poor PCB heatsinking.

Pinout & Package

SOT23-3 (Package Code: SA) is a 3-pin surface-mount package with exposed pad not present; thermal dissipation relies on PCB copper area connected to GND via pin 2. Pin pitch is 0.95mm, body size 2.9mm × 1.3mm × 1.0mm.

Pin	Circuit Role	Design Meaning
1	VIN	Main input supply rail; accepts 3–45V; requires 1μF ceramic decoupling capacitor placed adjacent to pin.
2	GND	Power ground reference; must connect to low-impedance PCB ground plane to minimize noise and ensure stability.
3	VOUT	Regulated 3.3V output; requires 10μF X7R/X5R ceramic capacitor placed within 2mm of pin for transient response and stability.

Key Features

Feature	Design Value
45V-tolerant EN pin	Enables direct high-voltage enable control without external resistor divider or level shifter.
No-startup overshoot	Guaranteed monotonic VOUT ramp during power-on, critical for FPGA configuration and flash programming sequences.
Short-circuit foldback	Limits output current to ~500mA during fault, reducing power dissipation and preventing thermal runaway.
Lead-free & halogen-free	RoHS 3 and JEDEC MSL Level 1 compliant; suitable for consumer, industrial, and automotive-qualified designs.

Applications

Smoke Detector Power Supply

Industrial Sensor Node

Use Scenario: Primary 3.3V rail for electrochemical CO sensor, MCU, and RF transceiver in battery-operated residential smoke alarms.

IC Role / Device Role / Timing Role: Ultra-low-I_Q LDO providing regulated bias for analog front-end and digital logic under intermittent wake-up duty cycles.

Use Value: 2.1μA quiescent current enables >10-year shelf life on two CR123A cells while maintaining fast wake-up response.

Use Scenario: Powering MEMS pressure and temperature sensors in factory-floor wireless condition-monitoring nodes.

IC Role / Device Role / Timing Role: Input-tolerant LDO accepting unregulated 12–36V field wiring, delivering clean 3.3V to precision ADC and BLE SoC.

Use Value: 45V input rating eliminates need for external TVS or pre-regulator; 85dB PSRR rejects noise from nearby motor drives.

Microcontroller Core Supply

Home Appliance Control Board

Use Scenario: Dedicated 3.3V supply for ARM Cortex-M0+ MCU core and USB PHY in smart metering modules.

IC Role / Device Role / Timing Role: Low-noise, high-accuracy LDO ensuring stable clock domain operation and reliable USB enumeration.

Use Value: ±2% output accuracy and <0.02%/mA load regulation prevent brown-out resets during burst communication events.

Use Scenario: Main system rail for display controller, touch interface, and Wi-Fi module in smart refrigerator control boards.

IC Role / Device Role / Timing Role: Robust LDO handling wide-line fluctuations from AC/DC adapter outputs and surviving load dumps.

Use Value: Thermal shutdown + hysteresis prevents lockup during compressor startup surges; SOT23-3 footprint minimizes board space.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-I_Q, wide-input LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS7B8733QDDARQ1	Automotive-grade AEC-Q100, 40V max input, 350mA, 28μA I_Q, no 45V EN pin	Requires external EN level shift for >40V systems; higher I_Q reduces battery life	Choose only if AEC-Q100 qualification is mandatory and input stays ≤40V.
MCP1703T-3302E/MB	25V max input, 250mA, 2.0μA I_Q, 3.3V fixed, no high-voltage EN	Cannot support 36V+ battery inputs; lacks integrated short-circuit foldback	Select when cost sensitivity outweighs input voltage headroom and protection depth.

Compared with TPS7B8733QDDARQ1 and MCP1703T-3302E/MB, the AP7375-33SA-7 uniquely combines 45V input/EN tolerance, 300mA capability, and sub-3μA quiescent current-enabling single-LDO solutions in high-voltage battery and industrial power architectures where space and BOM count are constrained.

Availability

AP7375-33SA-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and microcontroller applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AP7375-33SA-7 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

Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and North America.

The AP7375 series belongs to Diodes' high-reliability LDO portfolio, engineered specifically for wide-input, ultra-low-power applications in safety-critical and energy-constrained environments such as fire detection, industrial sensing, and smart home control systems.

FAQ

What is the minimum input voltage required for regulation at 3.3V output?

The AP7375-33SA-7 requires VIN ≥ VOUT + VDROP. At 10mA load, dropout is 35mV (typ.), so minimum VIN is 3.335V. At 100mA, dropout rises to 350mV (typ.), requiring VIN ≥ 3.65V. The device will not regulate below 3V input regardless of load.

Can the EN pin be left floating?

No. The EN pin must be actively driven high (≥1V) to enable or low (≤0.4V) to disable. Leaving it floating may cause unpredictable output behavior due to internal leakage paths; Diodes recommends connecting EN to VIN through a pull-up resistor or to GND via a switch.

Is an external bypass capacitor required on the VOUT pin?

Yes. A minimum 1μF ceramic capacitor (X7R/X5R) is required for stability, and 10μF is recommended for optimal load transient response. The capacitor must be placed within 2mm of VOUT and GND pins; larger values further reduce undershoot/overshoot during dynamic load steps.

Does the SOT23-3 package (SA) include an exposed thermal pad?

No. The SOT23-3 (SA) variant has no exposed pad. Thermal performance relies entirely on PCB copper area connected to pin 2 (GND). For higher power dissipation, consider the U-DFN2020-6 (FDCW) or SOT89 (Y) packages which feature thermal pads or larger copper footprints.

AP7375-33SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: AP7375

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 45V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.36V @ 100mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 5 µA

Current - Supply (Max):: -

PSRR:: 85dB (1kHz)

Control Features:: Current Limit

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP7375-33SA-7 FAQ

1.How can I place an order for AP7375-33SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7375-33SA-7 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 AP7375-33SA-7 reliable?

The price and inventory of AP7375-33SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7375-33SA-7 is usually 5 days.

3.What payment methods are accepted for AP7375-33SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7375-33SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7375-33SA-7?

AP7375-33SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7375-33SA-7 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 AP7375-33SA-7?

For technical support, including AP7375-33SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7375-33SA-7 requirements.

6.How does Aetrix verify that AP7375-33SA-7 is sourced from the original manufacturer or authorized distributors?

All AP7375-33SA-7 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 AP7375-33SA-7 meets industry standards.

7.What is the process for return or replacement of AP7375-33SA-7?

All AP7375-33SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7375-33SA-7, 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 AP7375-33SA-7 part is unused and in its original packaging.

Return procedure for AP7375-33SA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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