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Diodes Incorporated AP2138N-1.8TRG1
- Part No.:
- AP2138N-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,826
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Product details
Overview
AP2138N-1.8TRG1 from Diodes Incorporated is a fixed-output 1.8V CMOS low-dropout linear regulator optimized for ultra-low-power portable applications. It delivers 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 25mV typical dropout at 10mA load - enabling extended battery life in space-constrained devices such as mobile phones and portable AV systems.
For engineers reviewing the AP2138N-1.8TRG1 datasheet, AP2138N-1.8TRG1 pinout, AP2138N-1.8TRG1 application, or AP2138N-1.8TRG1 equivalent, key selection criteria include its SOT-23-3 package footprint, absence of enable control (distinguishing it from AP2139), thermal resistance of 81.9°C/W, and compatibility with 1µF ceramic input/output capacitors for stability.
Technical Context
This LDO integrates a precision voltage reference, error amplifier, feedback resistor network, and current-limit protection circuit in a single die. Its CMOS architecture enables stable regulation across input voltages from 2.5V to 6.0V while maintaining tight output accuracy over temperature (±100ppm/°C) and load (25mV load regulation).
No enable function or quick-discharge circuitry is present - confirming AP2138N-1.8TRG1 as the non-enable variant of the AP2138 series. The device operates across –40°C to +85°C ambient and features 350V MM / 2000V HBM ESD robustness, suitable for handheld consumer electronics assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.800V ±2% - ensures stable core voltage for 1.8V logic rails in microcontrollers and sensors |
| Quiescent Current | 1.0µA typical - minimizes standby power loss in battery-powered sleep modes |
| Max Output Current | 250mA - supports moderate-power peripherals like display drivers or audio codecs |
| Dropout Voltage | 25mV typical at 10mA - allows operation with <200mV headroom above output, e.g., 1.8V out from 2.0V Li-ion cell |
| Line Regulation | 6mV typical - maintains output stability despite input fluctuations from aging or load transients |
| Load Regulation | 25mV typical (1–100mA) - limits output shift during dynamic current changes in portable systems |
| Thermal Resistance θJA | 250°C/W (SOT-23-3) - defines maximum power dissipation limit under still-air PCB conditions |
Pinout & Package
SOT-23-3 surface-mount package with exposed pad not electrically connected; footprint compatible with JEDEC MO-178AB standard. Thermal performance validated per θJA = 250°C/W and θJC = 81.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; requires ≥1µF ceramic capacitor for stability and noise suppression |
| 2 | VOUT | Regulated 1.8V output; must be decoupled with ≥1µF ceramic capacitor having ESR 0.01–100Ω |
| 3 | GND | Analog ground reference; shared return path for input and output capacitors to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - extends shelf life and runtime in always-on sensor nodes and wearables |
| High output voltage accuracy | ±2% over temperature and line/load - eliminates need for external trimming in cost-sensitive designs |
| Low dropout voltage | 25mV at 10mA - enables direct regulation from partially discharged single-cell Li-ion or NiMH batteries |
| Stable with ceramic capacitors | 1µF minimum COUT (ESR 0.01–100Ω) - reduces BOM count and board area vs. tantalum alternatives |
| Robust thermal protection | Junction temperature limit +150°C with internal thermal shutdown - prevents failure during transient overload |
Applications
| Mobile Phone Power Rail | Portable Camera Sensor Bias |
|---|---|
|
Use Scenario: Regulating 1.8V supply for baseband processor I/O and memory interfaces in slim smartphone designs. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 1.8V rail with minimal quiescent draw during deep-sleep states. Use Value: 1.0µA IQ enables >1-year shelf life; 25mV dropout preserves usable battery range down to 1.825V input. |
Use Scenario: Providing stable bias voltage to CMOS image sensor analog front-end in compact action cameras. IC Role / Device Role / Timing Role: Low-noise voltage source ensuring consistent pixel response and reduced fixed-pattern noise. Use Value: ±2% output accuracy maintains ADC reference integrity; ceramic-capacitor compatibility simplifies layout near sensor module. |
| Wireless Headset Audio Codec | IoT Edge Node Microcontroller Core |
|
Use Scenario: Powering 1.8V digital audio codec in Bluetooth earbuds with tight thermal constraints. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating codec supply from noisy RF section. Use Value: 250°C/W θJA allows safe operation at 150mA load on 2-layer FR4 without heatsinking. |
Use Scenario: Supplying 1.8V core voltage to ARM Cortex-M0+ MCU in battery-operated environmental sensor nodes. IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC and wake-up circuitry during 99% duty-cycle sleep. Use Value: 0.1µA standby current not applicable (no CE pin), but 1.0µA IQ still achieves multi-year battery life at µA-level average load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2139N-1.8TRG1 | Includes active-high CE pin and quick-discharge circuit; 0.1µA standby current vs. 1.0µA IQ | Required where system-level power sequencing or fast output discharge is needed | Select only if enable control is mandatory; otherwise AP2138N-1.8TRG1 offers simpler routing and lower cost |
| AP7354-18SRG1 | Successor device with 300mA rating, 0.6µA IQ, and improved PSRR; SOT-23-3 pinout compatible | Designed for new designs requiring longer battery life and higher reliability per AEC-Q200 stress testing | Preferred for new designs per Diodes' obsolescence notice; AP2138N-1.8TRG1 remains viable for legacy BOM continuity |
Compared with AP2139N-1.8TRG1, AP2138N-1.8TRG1 eliminates enable complexity and reduces component count; compared with AP7354-18SRG1, it trades lower IQ and newer qualification for proven field reliability in mature portable platforms.
Availability
AP2138N-1.8TRG1 is available at Aetrix Electronics and suitable for mobile phone power management, portable camera sensor biasing, wireless headset audio regulation, and IoT edge node microcontroller core supply requiring stable component supply across production lifecycles.
Supply support for AP2138N-1.8TRG1 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 company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
AP2138 belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for battery-powered portable electronics where extended operating time and minimal board space are critical design constraints.
FAQ
What is the maximum input voltage for AP2138N-1.8TRG1?
The absolute maximum input voltage is 6.6V, but recommended operating range is 2.5V to 6.0V. Operation above 6.0V risks permanent damage and violates the manufacturer's specified operating conditions; sustained use at 6.6V is prohibited per Absolute Maximum Ratings table.
Does AP2138N-1.8TRG1 include an enable pin?
No. AP2138N-1.8TRG1 has no enable functionality - it is always active when VIN is within specification. The AP2139 variant adds pin 3 (CE) for logic-controlled on/off; this part uses only three pins: VIN, VOUT, and GND in SOT-23-3 configuration.
Can AP2138N-1.8TRG1 be used with ceramic output capacitors?
Yes. The device is explicitly characterized for stability with 1µF ceramic capacitors having ESR between 0.01Ω and 100Ω. No series resistor is required, and tantalum or electrolytic alternatives are unnecessary - reducing cost and footprint in space-limited designs.
Is AP2138N-1.8TRG1 recommended for new designs?
No. Diodes Incorporated states "AP2138/2139 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7354." AP2138N-1.8TRG1 remains supported for existing designs and legacy BOM maintenance, but AP7354-18SRG1 is the designated replacement with enhanced specs and qualification.
AP2138N-1.8TRG1 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2138N-1.8TRG1 FAQ
1.How can I place an order for AP2138N-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-1.8TRG1 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-1.8TRG1 reliable?
The price and inventory of AP2138N-1.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138N-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-1.8TRG1?
AP2138N-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-1.8TRG1 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-1.8TRG1?
For technical support, including AP2138N-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-1.8TRG1 requirements.
6.How does Aetrix verify that AP2138N-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-1.8TRG1 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-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-1.8TRG1?
All AP2138N-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-1.8TRG1, 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-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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