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Diodes Incorporated AP2138N-1.5TRG1
- Part No.:
- AP2138N-1.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-1.5TRG1.pdf
- Description:
- IC REG LINEAR 1.5V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,603
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Product details
Overview
AP2138N-1.5TRG1 from Diodes Incorporated is a fixed-output 1.5V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, designed for ultra-low-power battery-powered systems. It delivers up to 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 100mV typical dropout at 10mA load - enabling extended runtime in portable AV equipment and mobile communication tools.
For engineers reviewing the AP2138N-1.5TRG1 datasheet, AP2138N-1.5TRG1 pinout, AP2138N-1.5TRG1 application, or AP2138N-1.5TRG1 equivalent, key selection criteria include its 1.5V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, ultra-low IQ performance, and thermal resistance of 250°C/W in ambient conditions.
Technical Context
This LDO integrates a precision voltage reference, error amplifier, feedback resistor network, and current-limit protection circuit. Its CMOS architecture enables stable regulation across input voltages from 2.5V to 6.0V while maintaining tight output accuracy over temperature (±100ppm/°C).
No enable or discharge functionality is present - distinguishing it from the AP2139 series. The device operates across –40°C to +85°C ambient range and requires ≥1µF ceramic input/output capacitors for stability, with ESR between 0.01Ω and 100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% (1.47V–1.53V), ensuring stable core supply for low-voltage microcontrollers and sensors. |
| Quiescent Current | 1.0µA typical at zero load - critical for multi-year battery life in always-on IoT endpoints. |
| Max Output Current | 250mA continuous - supports moderate-power peripherals like camera modules and Bluetooth radios. |
| Dropout Voltage | 100mV typical at 10mA; 700mV max at 250mA - allows operation from single-cell Li-ion or alkaline sources down to ~1.6V input. |
| Line Regulation | 6mV typical (2.5V–6.0V input range) - minimizes output variation during battery discharge or supply ripple. |
| Load Regulation | 25mV typical (1mA–100mA load step) - maintains voltage stability during dynamic current demands. |
| Temp Coefficient | ±100ppm/°C - contributes <±1.5mV drift over –40°C to +85°C, suitable for precision analog subsystems. |
Pinout & Package
SOT-23-3 surface-mount package (3-pin, 1.3mm × 2.9mm × 1.0mm body height), RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for regulator current and error amplifier bias; must connect to low-impedance PCB ground plane. |
| 2 (VOUT) | Regulated output | Delivers stable 1.5V to load; requires ≥1µF ceramic capacitor placed within 2mm for loop 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 quiescent current | 1.0µA typical enables >10-year shelf life in coin-cell-powered remote sensors. |
| High output accuracy | ±2% tolerance ensures reliable operation of 1.5V I/O interfaces and ADC references without trimming. |
| Low thermal resistance | θJA = 250°C/W in SOT-23-3 allows 250mA delivery without external heatsinking below +60°C ambient. |
| Stable with ceramic capacitors | Supports 1µF–10µF X5R/X7R ceramics (ESR 0.01–100Ω), reducing BOM count vs. tantalum alternatives. |
| Robust protection | Internal current limiting (50mA short-circuit limit) prevents damage during output faults or inrush events. |
Applications
| Portable Medical Sensors | Wireless Remote Controls |
|---|---|
Use Scenario: Wearable pulse oximeter with BLE radio and analog front-end operating from CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 1.5V power rail for op-amps, ADC, and BLE SoC I/O domain. Use Value: 1.0µA quiescent current extends battery life to >2 years; ±2% accuracy avoids recalibration drift. |
Use Scenario: Sub-GHz RF remote using alkaline AA batteries and low-power MCU with 1.5V logic interface. IC Role / Device Role / Timing Role: Regulated supply for MCU core and RF transceiver digital I/O banks. Use Value: 100mV dropout at light load preserves usable battery range down to 1.6V input voltage. |
| Industrial Data Loggers | Smart Home Motion Detectors |
Use Scenario: Battery-backed environmental logger with temperature/humidity sensors and SPI flash memory. IC Role / Device Role / Timing Role: Stable 1.5V source for sensor signal conditioning and memory VCCIO. Use Value: ±100ppm/°C tempco ensures <±1.5mV output shift across –40°C to +85°C industrial range. |
Use Scenario: PIR-based occupancy sensor powered by two AA cells, transmitting via Zigbee or Matter. IC Role / Device Role / Timing Role: Powering 1.5V-compatible MCU and RF transceiver during wake-up bursts. Use Value: 250mA peak current supports simultaneous sensor readout and RF transmission without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-15SAG-7 | Successor device: 1.5V output, 300mA rating, 0.6µA IQ, improved PSRR (60dB @ 1kHz), same SOT-23-3 footprint. | Designed for next-gen ultra-low-power designs requiring longer battery life and better noise rejection. | Select when upgrading legacy designs or qualifying new products - offers direct drop-in replacement with enhanced specs. |
| MCP1700T-1502E/TT | Microchip part: 1.5V, 250mA, 1.6µA IQ, 170mV dropout at 250mA, different pinout (VIN-GND-VOUT). | Compatible in function but requires PCB layout revision due to reversed GND/VIN pin assignment. | Choose only if AP2138N-1.5TRG1 is unavailable and board redesign is acceptable. |
Compared with AP7354-15SAG-7, this part offers lower cost and proven field reliability but trades off 0.6µA IQ and higher PSRR; versus MCP1700T-1502E/TT, it provides superior dropout and pinout compatibility but lacks automotive qualification.
Availability
AP2138N-1.5TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wireless remote controls, industrial data loggers, and smart home motion detectors requiring stable component supply and long-term obsolescence management.
Supply support for AP2138N-1.5TRG1 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-efficiency power management and signal integrity solutions for consumer, industrial, and automotive markets.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for battery-constrained portable electronics where multi-year operational life and minimal voltage deviation are mandatory.
FAQ
What is the maximum input voltage for AP2138N-1.5TRG1?
The absolute maximum input voltage is 6.6V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.0V risks violating safe operating area limits and may trigger internal protection circuits. Operation above 6.0V is not guaranteed per datasheet specifications and reduces long-term reliability.
Does AP2138N-1.5TRG1 include an enable pin?
No. AP2138N-1.5TRG1 is a three-terminal LDO without enable or shutdown control - VIN, VOUT, and GND only. The AP2139 series adds CE functionality; this part is intended for always-on, simplicity-optimized applications where external on/off control is handled upstream.
Can AP2138N-1.5TRG1 be used with ceramic output capacitors?
Yes. It is explicitly characterized for stability with 1µF–10µF X5R/X7R ceramic capacitors having ESR between 0.01Ω and 100Ω. No series resistor is required, and placement within 2mm of VOUT/GND pins is recommended to minimize parasitic inductance.
Is AP2138N-1.5TRG1 qualified for automotive applications?
No. This variant is not AEC-Q100 qualified. Diodes offers automotive-grade versions under separate part numbering (e.g., AP2138Q series) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening. Use only the Q-suffix parts for automotive deployments.
AP2138N-1.5TRG1 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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 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-1.5TRG1 FAQ
1.How can I place an order for AP2138N-1.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-1.5TRG1 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-1.5TRG1 reliable?
The price and inventory of AP2138N-1.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138N-1.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-1.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-1.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-1.5TRG1?
AP2138N-1.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-1.5TRG1 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-1.5TRG1?
For technical support, including AP2138N-1.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-1.5TRG1 requirements.
6.How does Aetrix verify that AP2138N-1.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-1.5TRG1 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-1.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-1.5TRG1?
All AP2138N-1.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-1.5TRG1, 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-1.5TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-1.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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