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Diodes Incorporated AP7381-28Y-13
- Part No.:
- AP7381-28Y-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP7381-28Y-13.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,666
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Product details
Overview
AP7381-28Y-13 from Diodes Incorporated is a fixed-output 2.8V ultra-low dropout (ULDO) linear regulator IC designed for space-constrained portable and USB-powered systems. It delivers up to 150mA output current with 1000mV dropout at 100mA, ±2% output voltage accuracy, and 2.5µA quiescent current - enabling long battery life in e-meters and handheld devices.
For engineers reviewing the AP7381-28Y-13 datasheet, AP7381-28Y-13 pinout, AP7381-28Y-13 application, or AP7381-28Y-13 equivalent, key selection criteria include wide 3.3–40V input range, thermal shutdown protection, compatibility with low-ESR ceramic capacitors, and SOT89 package thermal performance for industrial ambient conditions.
Technical Context
The AP7381-28Y-13 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, current-limit circuitry (150mA), and chip-enable logic. Its architecture supports stable regulation under fast load transients while maintaining ultra-low ground current across input voltage and temperature.
It employs internal thermal shutdown (trip at +160°C, 20°C hysteresis) and short-circuit protection. The device operates over –40°C to +125°C junction temperature and achieves 60dB PSRR at 1kHz, making it suitable for noise-sensitive analog rails in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable power for 2.8V logic or sensor biasing without external feedback. |
| Input Voltage Range | 3.3V to 40V - supports direct connection to unregulated 12V/24V rails or automotive batteries with transient tolerance. |
| Dropout Voltage | 1000mV @ 100mA - enables regulation down to VIN = 3.8V, critical for battery-powered operation near end-of-discharge. |
| Quiescent Current | 2.5µA @ IOUT = 0A - minimizes standby power loss in always-on metering or IoT wake-up circuits. |
| Output Accuracy | ±2% over –40°C to +125°C - guarantees reliable microcontroller core voltage compliance across industrial temperature ranges. |
| Thermal Shutdown | +160°C trip with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| PSRR | 60dB @ 1kHz - suppresses ripple from upstream switching converters feeding the ULDO input. |
Pinout & Package
SOT89-3 package: compact 4.6mm × 2.6mm surface-mount outline with exposed thermal pad (pin 2 as GND), optimized for 125°C/W junction-to-ambient thermal resistance on standard 2-layer PCBs.
| 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 (GND) | Ground Reference & Thermal Pad | Primary return path and main thermal conduction node; must be connected to large copper pour for heat dissipation. |
| 3 (VOUT) | Regulated Output Terminal | Delivers stable 2.8V; requires 2.2µF low-ESR ceramic capacitor to ensure loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range Support | Operates from 3.3V up to 40V - eliminates need for pre-regulation stages in multi-rail industrial systems. |
| Ultra-Low Quiescent Current | 2.5µA at zero load - extends battery runtime in remote sensing nodes where sleep current dominates lifetime. |
| Ceramic Capacitor Compatibility | Stable with ≥2.2µF X5R/X7R ceramics - reduces BOM count and board area vs. tantalum or electrolytic solutions. |
| Integrated Protection | Current limit (150mA), thermal shutdown (+160°C), and short-circuit protection - removes need for external fault management circuitry. |
| High DC Accuracy | ±2% output tolerance over full temperature and line/load range - avoids post-regulation trimming in production test. |
Applications
| E-Meter Power Rail | Portable Medical Sensor |
|---|---|
Use Scenario: Primary 2.8V supply for metrology ASIC and real-time clock in smart electricity meters operating from 12–36V DC bus. IC Role / Device Role / Timing Role: ULDO regulator providing clean, accurate 2.8V rail independent of input ripple and battery aging. Use Value: Maintains ±2% output under 40V transients and –40°C cold starts, ensuring metrology accuracy certification compliance. | Use Scenario: Power source for low-power pulse oximeter front-end with analog signal chain and BLE SoC. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator supplying 2.8V to ADC reference and op-amp bias rails. Use Value: 60dB PSRR and 2.5µA IQ enable >1-year battery life in clinical-grade wearable form factors. |
| Laptop Subsystem Bias | Industrial Handheld Terminal |
Use Scenario: Secondary 2.8V rail for touch controller and display interface in notebook computers using shared 5V/12V system bus. IC Role / Device Role / Timing Role: Point-of-load regulator delivering stable voltage despite dynamic CPU/GPU load-induced input fluctuations. Use Value: 0.5% load regulation and 0.05%/V line regulation prevent touch jitter or display artifacts during high-speed data transfer. | Use Scenario: Main 2.8V supply for barcode scanner module and RF transceiver in ruggedized warehouse handhelds powered by Li-ion packs. IC Role / Device Role / Timing Role: Robust LDO handling 3.3–40V input variations from partially discharged batteries and ESD-prone environments. Use Value: Integrated 4kV HBM ESD protection and thermal shutdown eliminate need for external TVS diodes in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361-28Y-13 | Same SOT89 package, but 100mA rated output current and higher 1.2V dropout at 100mA. | Lower current capability limits use in systems requiring >100mA continuous load. | Select when cost sensitivity outweighs current headroom and thermal margin requirements. |
| MCP1700T-2802E/MB | 250mA rating and 600mV dropout at 250mA, but only 16V max input voltage and no thermal shutdown. | Lacks overtemperature protection and cannot support 24V/40V industrial inputs. | Prefer for consumer-grade battery apps below 16V where higher current and lower dropout are prioritized. |
Compared with AP7381-28Y-13, AP7361-28Y-13 trades current capacity and thermal robustness for lower cost, while MCP1700T-2802E/MB offers higher current and lower dropout but sacrifices input voltage range and integrated thermal safety - making AP7381-28Y-13 optimal for industrial 24V/40V systems requiring reliability and protection.
Availability
AP7381-28Y-13 is available at Aetrix Electronics and suitable for e-meter design, portable medical instrumentation, industrial handheld terminals, and laptop subsystem power requiring stable component supply with full traceability and long-term lifecycle assurance.
Supply support for AP7381-28Y-13 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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7381 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial equipment needing precision, low IQ, and robust fault protection without external components.
FAQ
What is the maximum allowable input voltage for AP7381-28Y-13?
The absolute maximum input voltage is 45V, but the recommended operating range is 3.3V to 40V per the datasheet. Operation above 40V risks exceeding thermal limits under load and violates specified operating conditions - sustained use beyond 40V may reduce reliability or trigger thermal shutdown.
Can AP7381-28Y-13 operate with a 10µF output capacitor?
Yes - the device is stable with ceramic capacitors from 2.2µF to 100µF. A 10µF X5R ceramic improves transient response and reduces output ripple compared to the minimum 2.2µF, with no risk of oscillation due to its internal compensation optimized for low-ESR caps.
Does AP7381-28Y-13 include an enable pin?
No - the AP7381-28Y-13 has no dedicated enable (EN) pin. It is always active when VIN is within specification. For on/off control, external switching of the input rail or use of the AP7381 variant with EN (e.g., AP7381W series) is required.
Is AP7381-28Y-13 qualified for automotive applications?
No - this specific part is not AEC-Q100 qualified. Diodes offers automotive-grade versions (e.g., AP7381Q series) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation; AP7381-28Y-13 is intended for industrial and commercial applications only.
AP7381-28Y-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- 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):
- 1V @ 100mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 25 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Current Limit, Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP7381-28Y-13 FAQ
1.How can I place an order for AP7381-28Y-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7381-28Y-13 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 AP7381-28Y-13 reliable?
The price and inventory of AP7381-28Y-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-28Y-13 is usually 5 days.
3.What payment methods are accepted for AP7381-28Y-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-28Y-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7381-28Y-13?
AP7381-28Y-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7381-28Y-13 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 AP7381-28Y-13?
For technical support, including AP7381-28Y-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-28Y-13 requirements.
6.How does Aetrix verify that AP7381-28Y-13 is sourced from the original manufacturer or authorized distributors?
All AP7381-28Y-13 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 AP7381-28Y-13 meets industry standards.
7.What is the process for return or replacement of AP7381-28Y-13?
All AP7381-28Y-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-28Y-13, 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 AP7381-28Y-13 part is unused and in its original packaging.
Return procedure for AP7381-28Y-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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