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Diodes Incorporated AP2138R-3.6TRG1
- Part No.:
- AP2138R-3.6TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-3.6TRG1.pdf
- Description:
- IC REG LINEAR 3.6V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:1,999
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Product details
Overview
AP2138R-3.6TRG1 from Diodes Incorporated is a fixed-output 3.6V 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 20mV typical dropout at 10mA load. It serves as a precision power supply for battery-powered microcontrollers and sensors in portable instrumentation.
For engineers reviewing the AP2138R-3.6TRG1 datasheet, AP2138R-3.6TRG1 pinout, AP2138R-3.6TRG1 application, or AP2138R-3.6TRG1 equivalent, key selection criteria include its 3.6V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, and suitability for low-power always-on subsystems requiring stable regulation down to 2.5V input.
Technical Context
The AP2138R-3.6TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain regulated 3.6V output across input voltages from 2.5V to 6.0V. Its CMOS pass element enables ultra-low quiescent current without sacrificing transient response.
Designed for battery-constrained systems, it achieves 25mV typical dropout at 10mA and maintains ±100ppm/°C output voltage temperature coefficient. Load and line regulation are specified at 25mV and 6mV typical respectively, ensuring stability under dynamic load and input variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.6V ±2% - ensures compatible rail for 3.3V–3.6V logic and analog ICs without external feedback. |
| Quiescent Current | 1.0µA typical - extends battery life in sleep-mode operation of IoT edge nodes and wearables. |
| Max Output Current | 250mA - supports moderate-power peripherals like BLE radios or small displays. |
| Dropout Voltage | 20mV typical at 10mA - enables regulation from 3.62V input, critical for single-cell Li-ion or Li-poly systems near end-of-discharge. |
| Line Regulation | 6mV typical - limits output drift during battery voltage sag or upstream converter ripple. |
| Load Regulation | 25mV typical - maintains voltage stability across 1–100mA load steps, suitable for burst-mode sensor acquisition. |
| Temp Coefficient | ±100ppm/°C - contributes ≤±0.3% output shift over –40°C to +85°C ambient, supporting industrial-grade accuracy. |
Pinout & Package
SOT-23-3 package with exposed pad for thermal enhancement; compact 2.9mm × 1.6mm footprint, 1.1mm height, and JEDEC-standard pinout.
| 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 3.6V to load; requires ≥1µF ceramic capacitor placed within 3mm for stability and PSRR. |
| 3 (VIN) | Input voltage supply | Accepts 2.5–6.0V DC input; requires ≥1µF ceramic decoupling capacitor adjacent to pin to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - reduces standby power loss to <3.6µW, enabling multi-year battery life in coin-cell applications. |
| High output voltage accuracy | ±2% over temperature and load - eliminates need for post-regulation trimming in cost-sensitive consumer designs. |
| Low dropout performance | 20mV @10mA - allows operation with minimal headroom, improving efficiency in narrow-input-range battery systems. |
| Thermal protection | Internal foldback current limit and thermal shutdown - prevents damage during sustained overload or poor PCB heatsinking. |
| Stability with ceramic capacitors | Compatible with 1µF–10µF X5R/X7R ceramics (ESR 0.01–100Ω) - simplifies BOM and layout by avoiding tantalum or electrolytic caps. |
Applications
| Portable Medical Sensors | Wireless Sensor Nodes |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and ultra-low-power ADC/microcontroller. IC Role / Device Role / Timing Role: Primary 3.6V power rail regulator for analog front-end and RF transceiver. Use Value: 1.0µA quiescent current extends 3V CR2032 battery life beyond 2 years in sleep mode while maintaining ±2% rail accuracy for calibrated sensor readings. |
Use Scenario: Battery-powered environmental node measuring temperature/humidity and transmitting via sub-GHz radio. IC Role / Device Role / Timing Role: Stable 3.6V supply for MCU, sensor interface, and RF IC during active transmission bursts. Use Value: 250mA peak current capability supports 200ms RF transmit pulses without brownout; 20mV dropout preserves regulation as battery discharges from 4.2V to 3.62V. |
| Industrial Handheld Scanners | Smart Wearable Displays |
|
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with frequent wake/sleep cycles. IC Role / Device Role / Timing Role: Main system LDO supplying processor core, imager, and laser driver. Use Value: ±100ppm/°C tempco ensures consistent imager bias voltage across –20°C to +60°C operating range, minimizing calibration drift. |
Use Scenario: Fitness tracker with OLED display, accelerometer, and Bluetooth LE SoC. IC Role / Device Role / Timing Role: Dedicated 3.6V rail for display driver IC and touch controller. Use Value: 6mV line regulation prevents visible OLED brightness flicker during battery voltage sag during GPS acquisition or charging transitions. |
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 |
|---|---|---|---|
| AP7354-36SA-7 | Successor device: 3.6V output, 300mA rating, 0.6µA IQ, improved PSRR, same SOT-23-3 package. | Supports higher peak loads and lower noise-sensitive analog circuits; recommended for new designs per Diodes' notice. | Select when upgrading legacy AP2138 designs or requiring >250mA or better noise rejection. |
| MCP1700T-3602E/MB | Microchip part: 3.6V, 250mA, 1.6µA IQ, 175mV dropout @250mA, SOT-23-3. | Higher dropout limits usable input range; slightly higher IQ increases standby power by ~0.6µA. | Consider only if AP2138R-3.6TRG1 is unavailable and design tolerates reduced efficiency at full load. |
Compared with AP7354-36SA-7, AP2138R-3.6TRG1 offers proven field reliability but lacks newer features like enhanced PSRR and lower IQ; versus MCP1700T-3602E/MB, it delivers significantly lower dropout and quiescent current, making it preferable for deep-sleep battery longevity and low-headroom inputs.
Availability
AP2138R-3.6TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wireless sensor nodes, industrial handheld scanners, and smart wearable displays requiring stable component supply and long-term manufacturability support.
Supply support for AP2138R-3.6TRG1 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, engineered specifically for energy-constrained portable and battery-powered systems where extended operational lifetime and minimal voltage headroom are critical.
FAQ
What is the minimum input voltage required for AP2138R-3.6TRG1 to maintain regulation?
The AP2138R-3.6TRG1 requires a minimum input voltage of 2.5V to sustain regulation at full 250mA load, per Recommended Operating Conditions. At light loads (e.g., 10mA), dropout is as low as 20mV, allowing stable 3.6V output from an input as low as 3.62V. Input below 2.5V risks unregulated output or shutdown.
Can AP2138R-3.6TRG1 be used with ceramic output capacitors?
Yes - the AP2138R-3.6TRG1 is explicitly designed for stability with 1µF–10µF ceramic capacitors having ESR between 0.01Ω and 100Ω. X5R and X7R dielectrics are recommended; no series resistance or tantalum alternatives are needed, simplifying layout and reducing BOM count.
Does AP2138R-3.6TRG1 include thermal shutdown protection?
Yes - the device incorporates internal thermal shutdown that activates at approximately +150°C junction temperature, plus current-limit foldback to prevent destructive overheating during sustained overload or inadequate PCB copper area. Recovery is automatic once junction temperature falls below the hysteresis threshold.
Is AP2138R-3.6TRG1 qualified for automotive applications?
No - AP2138R-3.6TRG1 is not AEC-Q100 qualified. Diodes Incorporated states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial, consumer, and portable equipment. For automotive use, contact Diodes directly for qualified alternatives.
AP2138R-3.6TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.6V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 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-89-3
AP2138R-3.6TRG1 FAQ
1.How can I place an order for AP2138R-3.6TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-3.6TRG1 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 AP2138R-3.6TRG1 reliable?
The price and inventory of AP2138R-3.6TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138R-3.6TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-3.6TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-3.6TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-3.6TRG1?
AP2138R-3.6TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-3.6TRG1 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 AP2138R-3.6TRG1?
For technical support, including AP2138R-3.6TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-3.6TRG1 requirements.
6.How does Aetrix verify that AP2138R-3.6TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-3.6TRG1 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 AP2138R-3.6TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-3.6TRG1?
All AP2138R-3.6TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-3.6TRG1, 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 AP2138R-3.6TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-3.6TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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