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Diodes Incorporated AP7381-28SA-7
- Part No.:
- AP7381-28SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7381-28SA-7.pdf
- Description:
- IC REG LIN 2.8V SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:5,680
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Product details
Overview
AP7381-28SA-7 from Diodes Incorporated is a fixed-output 2.8V ultra-low dropout (ULDO) linear regulator IC designed for space-constrained portable and battery-powered systems. It delivers up to 150mA output current with 1000mV dropout at 100mA, ±2% output voltage accuracy, and only 2.5µA ground current at zero load - enabling extended runtime in USB-powered and low-power IoT edge nodes.
For engineers reviewing the AP7381-28SA-7 datasheet, AP7381-28SA-7 pinout, AP7381-28SA-7 application, or AP7381-28SA-7 equivalent, key selection considerations include its 3.3–40V wide input range, thermal shutdown protection, compatibility with low-ESR ceramic capacitors, and SOT23-3 package footprint for high-density PCB layouts.
Technical Context
The AP7381-28SA-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, current-limit circuitry (150mA), and chip-enable logic. Its internal architecture supports stable regulation under fast load transients while maintaining ultra-low quiescent current across temperature.
It operates over –40°C to +125°C junction temperature, features 60dB PSRR at 1kHz, ±100ppm/°C output voltage temperature coefficient, and built-in short-circuit and thermal shutdown protection - making it suitable for unregulated input rails in industrial and consumer power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for 2.8V logic, sensors, and RF front-end ICs without external feedback. |
| Input Voltage Range | 3.3V to 40V - supports direct connection to automotive batteries, industrial 24V rails, or multi-cell Li-ion packs. |
| Dropout Voltage | 1000mV @ 100mA - enables regulation down to VIN = 3.8V, critical for brown-out resilience in battery discharge cycles. |
| Ground Current | 2.5µA @ IOUT = 0mA - minimizes standby power loss in always-on monitoring circuits and energy-harvesting nodes. |
| Thermal Shutdown | Triggers at +160°C with +20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking in SOT23-3. |
| PSRR | 60dB @ 1kHz - suppresses ripple from noisy DC-DC converters feeding the LDO input, preserving analog signal integrity. |
| Load Regulation | ±0.5% @ 1–150mA - maintains tight voltage stability across dynamic current demands of microcontrollers and peripherals. |
Pinout & Package
SOT23-3 package: compact 2.9mm × 1.3mm surface-mount outline with gull-wing leads, JEDEC Level 1 moisture sensitivity, matte tin-plated terminals, and 0.009g unit weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply Terminal | Accepts 3.3–40V unregulated input; requires 1µF ceramic decoupling close to pin for stability. |
| 2 (VOUT) | Regulated Output Terminal | Delivers fixed 2.8V ±2%; connects to 2.2µF ceramic output capacitor for transient response and ESR tolerance. |
| 3 (GND) | Ground Reference Terminal | Common return path for input/output currents and internal error amplifier; must be low-impedance PCB plane tie. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (3.3–40V) | Eliminates need for pre-regulation stages when powering from variable sources like solar chargers or vehicle batteries. |
| Ultra-Low Quiescent Current (2.5µA) | Extends battery life in always-on devices such as smart meters and wireless sensor nodes operating on coin cells or small LiPo. |
| Low-ESR Ceramic Capacitor Support | Enables use of compact, reliable, and cost-effective 0402/0603 MLCCs instead of larger tantalum or aluminum electrolytics. |
| Integrated Thermal Shutdown | Autonomously disables output above +160°C, protecting PCB traces and adjacent components during fault conditions. |
| Short-Circuit Protection | Limits output current to ~150mA during hard shorts, preventing thermal runaway and enabling safe auto-recovery. |
Applications
| Smart Energy Meters | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering metrology ICs, RTCs, and RF transceivers in Class 0.2 electricity meters with long-term battery backup. IC Role / Device Role / Timing Role: Primary 2.8V supply rail for precision ADCs and low-power BLE modules requiring stable, low-noise voltage. Use Value: 2.5µA ground current extends 10-year battery life; ±2% accuracy ensures consistent calibration across temperature. |
Use Scenario: Regulating power for wearable ECG/SpO₂ sensors powered by single-cell Li-ion or coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise bias source for analog front-end amplifiers and SAR ADCs sampling physiological signals. Use Value: 60dB PSRR rejects switching noise from companion DC-DC converters; 1000mV dropout sustains operation down to 3.2V battery voltage. |
| Industrial Handheld Terminals | USB-Powered Test Equipment |
|
Use Scenario: Providing clean 2.8V supply to ARM Cortex-M microcontrollers and touch controllers in ruggedized field tools. IC Role / Device Role / Timing Role: Main system LDO delivering regulated core voltage under varying load and ambient temperature (-40°C to +85°C). Use Value: ±0.5% load regulation maintains MCU clock stability during burst-mode wireless transmission; thermal shutdown prevents field failure. |
Use Scenario: Deriving 2.8V rail from USB 5V bus for portable oscilloscope probes and logic analyzer interfaces. IC Role / Device Role / Timing Role: Post-regulator isolating sensitive analog circuitry from USB port noise and voltage fluctuations. Use Value: Wide 3.3–40V input accommodates USB PD negotiation fallback; SOT23-3 footprint fits miniaturized probe PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT (Microchip) | 100mA output, 600mV dropout @ 100mA, 1.6µA IQ - lower current and dropout, but no thermal shutdown. | Suitable for sub-100mA sensor nodes where thermal margin is guaranteed; lacks fault protection for higher-load use cases. | Select when ultra-low IQ dominates over fault safety and output current headroom. |
| TPS7A2028PDQNR (TI) | 300mA output, 170mV dropout @ 100mA, 25µA IQ - significantly lower dropout and higher current, but larger X2SON package. | Better for high-efficiency, high-current apps like USB-C accessories; requires different layout and thermal design. | Choose when minimizing dropout voltage is critical and board space allows 1.0mm × 1.0mm X2SON. |
Compared with MCP1700T-2802E/TT and TPS7A2028PDQNR, the AP7381-28SA-7 uniquely balances 150mA capability, 1000mV dropout, 2.5µA IQ, and integrated thermal/short-circuit protection in the industry-standard SOT23-3 footprint - offering robustness and layout continuity for mid-power portable designs.
Availability
AP7381-28SA-7 is available at Aetrix Electronics and suitable for smart metering, portable medical instrumentation, industrial handheld terminals, and USB-powered test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AP7381-28SA-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AP7381 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial applications demanding low IQ, robust protection, and compatibility with ceramic capacitors.
FAQ
What is the maximum input voltage rating for AP7381-28SA-7?
The absolute maximum input voltage is 45V, but the recommended operating range is 3.3V to 40V. Operation above 40V risks exceeding thermal limits under load, especially in the SOT23-3 package with its 167°C/W junction-to-ambient thermal resistance. For continuous 40V operation, ensure PCB copper area and airflow meet Diodes' JEDEC High-K board guidelines.
Does AP7381-28SA-7 require an external enable signal?
No - the AP7381-28SA-7 has no enable pin and operates continuously when VIN is within specification. It lacks active shutdown control; power sequencing is managed solely via VIN application. If system-level ON/OFF control is needed, an external MOSFET switch on the input rail must be used.
Can AP7381-28SA-7 be used with 100nF output capacitance?
No - the datasheet specifies a minimum 2.2µF ceramic output capacitor for stability and transient response. Using 100nF violates the phase-margin requirement and may cause oscillation or excessive overshoot during load steps. Always follow the 2.2µF minimum with X5R/X7R dielectric and ≤100mΩ ESR.
Is AP7381-28SA-7 qualified for automotive applications?
No - the AP7381-28SA-7 is not AEC-Q100 qualified. While it operates from –40°C to +125°C, it lacks automotive-specific change control, PPAP documentation, and IATF 16949 manufacturing validation. For automotive use, contact Diodes directly for AEC-qualified alternatives such as the AP7361x-Q series.
AP7381-28SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- 25 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Current Limit, Short Circuit, Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP7381-28SA-7 FAQ
1.How can I place an order for AP7381-28SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7381-28SA-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 AP7381-28SA-7 reliable?
The price and inventory of AP7381-28SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-28SA-7 is usually 5 days.
3.What payment methods are accepted for AP7381-28SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-28SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7381-28SA-7?
AP7381-28SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7381-28SA-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 AP7381-28SA-7?
For technical support, including AP7381-28SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-28SA-7 requirements.
6.How does Aetrix verify that AP7381-28SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7381-28SA-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 AP7381-28SA-7 meets industry standards.
7.What is the process for return or replacement of AP7381-28SA-7?
All AP7381-28SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-28SA-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 AP7381-28SA-7 part is unused and in its original packaging.
Return procedure for AP7381-28SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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