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Diodes Incorporated AP2138N-2.8TRG1
- Part No.:
- AP2138N-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,151
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Product details
Overview
AP2138N-2.8TRG1 from Diodes Incorporated is a fixed-output 2.8V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering up to 250mA output current with ±2% output voltage accuracy, ultra-low 1.0µA typical quiescent current, and 25mV typical dropout at 10mA load. It serves as a precision power supply for battery-powered microcontrollers and sensors in portable electronics.
For engineers reviewing the AP2138N-2.8TRG1 datasheet, AP2138N-2.8TRG1 pinout, AP2138N-2.8TRG1 application, or AP2138N-2.8TRG1 equivalent, key selection criteria include its 2.8V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, thermal resistance of 81.9°C/W, and suitability for low-power always-on subsystems requiring stable regulation under light-load conditions.
Technical Context
The AP2138N-2.8TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain regulated 2.8V output across input voltages from 2.5V to 6.0V. Its CMOS architecture enables ultra-low quiescent current without compromising line regulation (6mV typical) or load regulation (25mV typical).
No enable or discharge circuitry is present-this is the AP2138 variant, not the AP2139. The device operates over –40°C to +85°C ambient temperature and features internal current limiting and thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% (2.744V–2.856V), enabling direct replacement of 2.8V logic rails without external feedback. |
| Quiescent Current | 1.0µA typical at zero load-critical for multi-year battery life in IoT sensor nodes and wearables. |
| Max Output Current | 250mA continuous-supports moderate-power peripherals like BLE radios or small displays. |
| Dropout Voltage | 25mV typical at 10mA; 500mV max at 250mA-allows operation from single-cell Li-ion (3.0V min) down to end-of-discharge. |
| Line Regulation | 6mV typical across 3.8V–6.0V input-ensures stable output despite battery voltage sag or supply ripple. |
| Load Regulation | 25mV typical from 1mA to 100mA-maintains tight voltage control during dynamic load transitions. |
| Temp Coefficient | ±100ppm/°C-limits output drift to ±280µV/°C, supporting precision analog front-ends. |
Pinout & Package
SOT-23-3 surface-mount package with exposed pad (thermal enhancement), 1.3mm × 2.9mm footprint, JEDEC MO-178AC compliant, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for output current and internal bias; must be connected to low-impedance PCB ground plane. |
| 2 (VOUT) | Regulated output | Delivers stable 2.8V to load; requires ≥1µF ceramic capacitor (ESR 0.01–100Ω) for stability. |
| 3 (VIN) | Input supply | Accepts 2.5V–6.0V unregulated input; requires ≥1µF ceramic decoupling capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.0µA typical quiescent current enables >10-year battery life in coin-cell-powered devices at µA-level standby loads. |
| High accuracy | ±2% output tolerance ensures reliable operation of 2.8V I/O interfaces without margining overhead. |
| Low thermal resistance | 81.9°C/W θJC allows 250mA operation with minimal die temperature rise on standard FR-4 PCBs. |
| Stable with ceramic caps | Compatible with low-ESR ceramic capacitors (≥1µF), eliminating need for costly tantalum or polymer alternatives. |
| Integrated protection | Current limit and thermal shutdown prevent damage during short-circuit or overload events without external components. |
Applications
| Wearable Health Sensors | IoT Edge Node Power |
|---|---|
|
Use Scenario: Continuous ECG/PPG monitoring in wrist-worn devices powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying analog front-end, MCU core, and BLE transceiver. Use Value: 1.0µA quiescent current extends battery life beyond 2 years while maintaining ±2% rail accuracy for ADC reference stability. |
Use Scenario: Battery-backed environmental sensor node (temperature/humidity/pressure) transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Always-on 2.8V regulator for real-time clock, memory retention, and wake-up controller. Use Value: Low dropout (25mV @10mA) permits operation down to 2.85V input, maximizing usable battery capacity from 3.0V Li-SOCl₂ cells. |
| Portable Audio DAC Supply | Industrial Sensor Signal Chain |
|
Use Scenario: High-fidelity audio playback in Bluetooth headphones using 2.8V DAC and Class-D amplifier. IC Role / Device Role / Timing Role: Clean, low-noise 2.8V analog supply isolated from noisy digital rails. Use Value: 6mV line regulation and 25mV load regulation minimize supply-induced distortion in 16-bit+ audio paths. |
Use Scenario: 4–20mA loop-powered smart pressure transmitter with HART communication. IC Role / Device Role / Timing Role: Local 2.8V rail for signal conditioning, ADC, and microcontroller in <200µA loop budget. Use Value: 1.0µA IQ consumes <0.3% of available loop current, preserving headroom for sensor excitation and HART modulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-28SAG-7 | Successor device: same 2.8V output, 300mA rating, 0.6µA IQ, improved PSRR (65dB @1kHz), SOT-23-3 compatible pinout. | Supports higher peak loads and lower noise-sensitive analog circuits; qualified for automotive AEC-Q100 Grade 2. | Select when upgrading legacy designs or requiring extended lifetime support, lower noise, or automotive qualification. |
| MCP1700-2802E/TO | Microchip's 2.8V variant: 250mA, 1.6µA IQ, 170mV dropout @100mA, TO-92 through-hole package only. | Limited to prototyping or low-volume through-hole assemblies; lacks SOT-23-3 footprint compatibility. | Choose only for manual assembly or legacy board rework where SMT is unavailable; avoid for new SMT designs. |
Compared with AP2138N-2.8TRG1, AP7354-28SAG-7 delivers lower quiescent current and better noise rejection for next-gen portable systems, while MCP1700-2802E/TO trades surface-mount compatibility for through-hole availability-neither offers identical performance-per-mm² in space-constrained SMT layouts.
Availability
AP2138N-2.8TRG1 is available at Aetrix Electronics and suitable for wearable health sensors, IoT edge nodes, portable audio DAC supplies, and industrial sensor signal chains requiring stable component supply with long-term manufacturability assurance.
Supply support for AP2138N-2.8TRG1 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 solutions for power management, signal integrity, and connectivity applications.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO portfolio, designed specifically for energy-constrained portable and battery-powered systems where micropower efficiency and small-footprint regulation are mandatory.
FAQ
What is the minimum input voltage required for AP2138N-2.8TRG1 to regulate 2.8V output?
The AP2138N-2.8TRG1 requires a minimum input voltage of 2.5V per datasheet Recommended Operating Conditions. At 10mA load, dropout is 25mV typical, so 2.825V input guarantees regulation; at 250mA, 3.3V input is recommended for margin. Operation below 2.5V may cause unregulated output or dropout.
Can AP2138N-2.8TRG1 be used with ceramic output capacitors?
Yes-AP2138N-2.8TRG1 is explicitly characterized for stability with ceramic capacitors ≥1µF and ESR between 0.01Ω and 100Ω. No series resistor or special compensation is needed, simplifying layout and reducing BOM cost versus tantalum or aluminum electrolytic alternatives.
Does AP2138N-2.8TRG1 include an enable pin?
No. AP2138N-2.8TRG1 is the non-enable variant of the AP2138/2139 family. It has no CE (chip enable) pin or quick-discharge function-power state is controlled solely by VIN. For enable functionality, use AP2139-2.8 variants in SOT-23-5 package.
Is AP2138N-2.8TRG1 recommended for new designs?
No-the official datasheet states "AP2138/2139 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7354." AP2138N-2.8TRG1 remains available for legacy support and existing production, but AP7354-28SAG-7 is the designated drop-in successor with improved specs and extended lifecycle commitment.
AP2138N-2.8TRG1 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):
- 6V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 1.5 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2138N-2.8TRG1 FAQ
1.How can I place an order for AP2138N-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-2.8TRG1 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 AP2138N-2.8TRG1 reliable?
The price and inventory of AP2138N-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138N-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-2.8TRG1?
AP2138N-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-2.8TRG1 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 AP2138N-2.8TRG1?
For technical support, including AP2138N-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-2.8TRG1 requirements.
6.How does Aetrix verify that AP2138N-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-2.8TRG1 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 AP2138N-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-2.8TRG1?
All AP2138N-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-2.8TRG1, 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 AP2138N-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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