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Diodes Incorporated AP7375-18SA-7
- Part No.:
- AP7375-18SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7375-18SA-7.pdf
- Description:
- IC REG LIN 1.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
AP7375-18SA-7 from Diodes Incorporated is a 1.8V fixed-output, 300mA ultra-low-dropout linear regulator with 45V max input voltage, 2.1μA quiescent current, and SOT23-3 package. It integrates EN pin rated to 45V, thermal shutdown, short-circuit protection, and delivers ±2% output accuracy - deployed in battery-powered smoke detectors where wide VIN range and low IQ enable multi-year operation on coin cells.
For engineers reviewing the AP7375-18SA-7 datasheet, AP7375-18SA-7 pinout, AP7375-18SA-7 application, or AP7375-18SA-7 equivalent, key selection criteria include dropout voltage at 10mA (35mV typ.), PSRR of 85dB @ 1kHz, fast load transient response without overshoot, and compatibility with 1μF ceramic input / 10μF ceramic output capacitors.
Technical Context
The AP7375-18SA-7 employs a PMOS pass transistor architecture enabling true low-dropout operation down to 35mV at light load and 350mV at 100mA. Its EN pin accepts up to 45V directly, eliminating level-shifting circuitry in high-VIN systems.
Internal compensation ensures stability with 1μF–10μF ceramic output capacitors; fast line/load transient response is achieved via high-gain error amplifier and optimized loop dynamics - verified by <1ms recovery with no overshoot during short-circuit recovery or startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - enables direct powering of low-voltage MCUs and sensors without external feedback. |
| Max Input Voltage | 45V - supports industrial 24V/36V rails and automotive load-dump conditions without pre-regulation. |
| Dropout Voltage | 35mV @ 10mA (typ.) - sustains regulation down to VIN = 1.835V, critical for end-of-battery-life operation. |
| Quiescent Current | 2.1μA (typ.) - extends battery life in always-on smoke detectors beyond 10 years with CR2032. |
| PSRR | 85dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Triggers at +150°C with +20°C hysteresis - prevents latch-up during sustained overload or poor PCB heatsinking. |
| Enable Threshold | VENH = 1V min, VENL = 0.4V max - compatible with 1.8V/3.3V GPIOs and robust against noise on EN line. |
Pinout & Package
SOT23-3 (Package Code: SA) - 2.9mm × 1.3mm × 1.0mm body, 0.95mm pitch, matte tin-plated leads, JEDEC-compliant footprint. Exposed pad absent; thermal dissipation relies on copper area under GND pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 3V–45V; requires 1μF ceramic decoupling placed adjacent to pin for stability and noise rejection. |
| 2 (GND) | Power ground reference | Low-impedance return path for both input and output currents; must connect to main system ground plane. |
| 3 (VOUT) | Regulated output terminal | Delivers 1.8V ±2% at up to 300mA; output capacitor (≥10μF ceramic) must be placed within 2mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3V–45V) | Eliminates need for external step-down stage in 12V/24V battery or industrial systems. |
| No overshoot during startup/short-circuit recovery | Guarantees safe power sequencing for sensitive microcontrollers and analog sensors. |
| 45V-rated EN pin | Enables direct high-side enable control from unregulated rails - no external resistor divider required. |
| ±2% output accuracy over temp/load | Meets tight tolerance requirements for ADC references and precision sensor biasing. |
| Lead-free, halogen-free, RoHS 3 compliant | Fulfills global environmental compliance mandates for consumer, industrial, and automotive end equipment. |
Applications
| Smoke Detector Power Supply | Industrial Sensor Node |
|---|---|
|
Use Scenario: CR2032-powered optical smoke detector operating continuously for >10 years. IC Role / Device Role / Timing Role: Primary 1.8V regulator supplying MCU, IR LED driver, and photodiode amplifier. Use Value: 2.1μA IQ and 35mV dropout extend usable battery voltage down to 1.835V, maximizing energy extraction. |
Use Scenario: Wireless temperature/humidity sensor node powered by 24V industrial bus with local 1.8V rail. IC Role / Device Role / Timing Role: Post-regulator converting 5V intermediate rail to clean 1.8V for low-power MCU and RF transceiver. Use Value: 85dB PSRR at 1kHz rejects switching noise from upstream buck converter, ensuring stable RF performance. |
| Home Appliance Control Board | Microcontroller Core Supply |
|
Use Scenario: Washing machine main control board with 12V system rail powering 1.8V logic. IC Role / Device Role / Timing Role: Local LDO for FPGA configuration memory and I/O bank supply. Use Value: 45V input rating withstands load-dump transients up to 40V, avoiding external TVS diodes. |
Use Scenario: Embedded ARM Cortex-M0+ MCU requiring tightly regulated 1.8V core voltage. IC Role / Device Role / Timing Role: Core voltage regulator with fast transient response to handle CPU burst loads. Use Value: Sub-1ms load transient recovery with zero overshoot prevents clock domain glitches during instruction fetch bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-IQ, wide-input LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-1802E/MB | 2.3μA IQ, 25V max VIN, SOT23-3, 300mA - lacks 45V EN pin and fast transient immunity. | Restricted to ≤25V systems; requires external EN level shift for 24V+ rails. | Choose when input never exceeds 25V and cost sensitivity outweighs transient robustness. |
| TPS7A1633DRBR | 17μA IQ, 60V max VIN, 150mA, SON-8 - higher IQ, lower current, different package and pinout. | Not drop-in; requires PCB redesign and larger layout area; better for 60V automotive but over-specified for 45V industrial. | Prefer only if 60V rating is mandatory and 150mA suffices; otherwise AP7375-18SA-7 offers superior IQ and footprint efficiency. |
Compared with MCP1703T-1802E/MB and TPS7A1633DRBR, the AP7375-18SA-7 uniquely combines 45V input, 45V EN pin, 2.1μA IQ, and SOT23-3 footprint - delivering optimal balance of ultra-low power, high-voltage resilience, and minimal board space for long-life battery and industrial 24V systems.
Availability
AP7375-18SA-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and microcontroller applications requiring stable component supply across industrial temperature range (−40°C to +85°C) and multi-year production cycles.
Supply support for AP7375-18SA-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 company specializing in discrete, analog, and mixed-signal ICs, with design centers in Asia, Europe, and the US, serving industrial, computing, and consumer markets.
The AP7375 series belongs to Diodes' high-reliability LDO portfolio targeting battery-constrained and wide-input industrial applications - engineered for ultra-low IQ, high-voltage resilience, and robust transient immunity without external components.
FAQ
What is the minimum input voltage required for regulation at 1.8V output?
The AP7375-18SA-7 requires VIN ≥ VOUT + VDROP(max). At 10mA load, VDROP is 50mV (max), so minimum VIN is 1.85V. However, per datasheet Note 5, full internal operation begins only when VIN ≥ 3V or (VOUT + VDROP(max)), whichever is greater - thus 3V is the practical minimum for guaranteed functionality.
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 risks undefined output state due to noise coupling or leakage paths. For default-enable operation, tie EN to VIN through a 100kΩ resistor; for default-disable, tie to GND.
Is an external bypass capacitor required on the VOUT pin?
Yes. A minimum 10μF ceramic capacitor (X5R/X7R) is required at VOUT for stability and transient response. Lower values (e.g., 1μF) may cause oscillation or excessive undershoot/overshoot during load steps. Place it within 2mm of VOUT and GND pins using short, wide traces.
Does AP7375-18SA-7 support reverse polarity protection?
No. The device lacks integrated reverse-voltage protection. If input polarity reversal is possible in the system, an external series Schottky diode (with VF < 0.3V) or ideal diode controller must be added between VIN and the AP7375 input to prevent damage.
AP7375-18SA-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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.36V @ 100mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 5 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- 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
AP7375-18SA-7 FAQ
1.How can I place an order for AP7375-18SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7375-18SA-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 AP7375-18SA-7 reliable?
The price and inventory of AP7375-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7375-18SA-7 is usually 5 days.
3.What payment methods are accepted for AP7375-18SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7375-18SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7375-18SA-7?
AP7375-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7375-18SA-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 AP7375-18SA-7?
For technical support, including AP7375-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7375-18SA-7 requirements.
6.How does Aetrix verify that AP7375-18SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7375-18SA-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 AP7375-18SA-7 meets industry standards.
7.What is the process for return or replacement of AP7375-18SA-7?
All AP7375-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7375-18SA-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 AP7375-18SA-7 part is unused and in its original packaging.
Return procedure for AP7375-18SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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