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Diodes Incorporated AP2138R-1.4TRG1
- Part No.:
- AP2138R-1.4TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-1.4TRG1.pdf
- Description:
- IC REG LINEAR 1.4V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,869
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Product details
Overview
AP2138R-1.4TRG1 from Diodes Incorporated is a fixed-output 1.4V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering up to 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 100mV typical dropout at 10mA load. It serves as a precision power supply for ultra-low-power microcontrollers and sensors in battery-powered portable devices.
For engineers reviewing the AP2138R-1.4TRG1 datasheet, AP2138R-1.4TRG1 pinout, AP2138R-1.4TRG1 application, or AP2138R-1.4TRG1 equivalent, key selection criteria include its 1.4V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, thermal resistance of 81.9°C/W, and absence of enable control-distinguishing it from the AP2139 series.
Technical Context
This LDO integrates a precision voltage reference, error amplifier, and resistor network for stable 1.4V regulation without external feedback components. Its CMOS pass transistor enables ultra-low quiescent current and tight load/line regulation-6mV typical line regulation and 25mV typical load regulation over full operating range.
The device operates across -40°C to +85°C ambient temperature with input voltage from 2.5V to 6.0V, supporting stable regulation even under light loads down to zero current. Dropout voltage remains below 300mV at 100mA output, enabling efficient operation from single-cell Li-ion or two-cell alkaline sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.400V ±2% - ensures stable core voltage for 1.4V-tolerant logic or analog circuitry |
| Quiescent Current | 1.0µA typical - extends battery life in always-on sensor nodes and wearables |
| Max Output Current | 250mA - supports moderate-power peripherals like BLE radios or small displays |
| Dropout Voltage | 100mV typical at 10mA - allows operation with <100mV headroom above output, e.g., 1.5V input for 1.4V output |
| Line Regulation | 6mV typical - maintains output stability despite input fluctuations from aging batteries |
| Load Regulation | 25mV typical - limits output shift from no-load to full 250mA load, critical for ADC reference stability |
| Temp Coefficient | ±100ppm/°C - contributes <±0.12% output drift over -40°C to +85°C junction range |
Pinout & Package
SOT-23-3 package: compact 3-pin surface-mount outline with exposed pad option (R suffix), optimized for space-constrained portable PCBs and thermal performance up to 81.9°C/W junction-to-case resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output voltage regulation; requires low-impedance PCB connection |
| 2 | VOUT | Regulated 1.4V output; must be decoupled with ≥1µF ceramic capacitor for stability |
| 3 | VIN | Input supply (2.5–6.0V); requires ≥1µF ceramic input capacitor to suppress noise and ensure transient response |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.0µA typical quiescent current enables >1-year battery life in 10µA average-load IoT endpoints |
| High accuracy | ±2% output tolerance meets requirements for precision analog front-ends and reference-sensitive ADCs |
| Low dropout | 100mV typical at 10mA allows use with weak or deeply discharged batteries while maintaining regulation |
| Thermal robustness | 150°C max junction temperature and 81.9°C/W θJC support continuous 250mA operation in sealed enclosures |
| Stability assurance | Guaranteed stable with 1µF ceramic output capacitor (ESR 0.01–100Ω), simplifying BOM and layout |
Applications
| Wearable Health Sensors | Low-Power MCU Subsystem |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring in wrist-worn devices powered by coin-cell or thin-film batteries. IC Role / Device Role / Timing Role: Primary 1.4V supply for analog signal chain and ultra-low-power microcontroller core domain. Use Value: 1.0µA quiescent current minimizes standby drain; ±2% accuracy ensures consistent ADC reference scaling across temperature. | Use Scenario: Powering ARM Cortex-M0+ or RISC-V cores in battery-backed industrial loggers. IC Role / Device Role / Timing Role: Fixed 1.4V LDO supplying CPU I/O and peripheral domains where precise voltage margining is required. Use Value: 100mV dropout enables operation down to 1.5V input, extending usable battery range beyond typical 1.8V LDOs. |
| Portable Medical Testers | Smart RFID Tags |
Use Scenario: Handheld glucose meters or pulse oximeters requiring stable analog measurement under variable battery voltage. IC Role / Device Role / Timing Role: Precision 1.4V rail for op-amp-based transimpedance amplifiers and reference buffers. Use Value: 6mV line regulation prevents measurement offset drift during battery discharge; ±100ppm/°C tempco maintains calibration integrity. | Use Scenario: Passive UHF RFID tags with integrated sensing and wake-up logic powered by energy harvesting. IC Role / Device Role / Timing Role: Ultra-low-IQ 1.4V regulator enabling sub-µA sleep current while retaining fast wake-up capability. Use Value: 1.0µA IQ allows multi-year operation on harvested microwatt sources; SOT-23-3 footprint fits constrained tag PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-1.4SG-7 | Successor device with same 1.4V output, 300mA rating, and 0.6µA IQ; SOT-23-3 compatible pinout | Supports higher peak loads and lower IQ; qualified for automotive AEC-Q100 Grade 2 | Select for new designs requiring extended lifecycle support and improved efficiency |
| MCP1700T-1402E/TT | 1.4V fixed output, 250mA, 1.6µA IQ, SOT-23-3; lacks ±2% accuracy (±3% typical) | Higher quiescent current reduces battery life in multi-year deployments | Acceptable for cost-sensitive consumer applications where ±3% tolerance is sufficient |
Compared with AP2138R-1.4TRG1, AP7354-1.4SG-7 offers lower IQ and automotive qualification but requires validation of revised thermal derating curves, while MCP1700T-1402E/TT trades accuracy and IQ for broader distributor availability and lower unit cost.
Availability
AP2138R-1.4TRG1 is available at Aetrix Electronics and suitable for wearable health sensors, portable medical testers, low-power MCU subsystems, and smart RFID tags requiring stable component supply with known end-of-life timing.
Supply support for AP2138R-1.4TRG1 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 AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, designed specifically for battery-critical portable electronics where multi-year operation from primary cells is mandatory.
FAQ
What is the minimum input voltage required for AP2138R-1.4TRG1 to maintain regulation at 250mA?
The device requires VIN ≥ VOUT + VDROP. At 250mA, typical dropout is 1000mV per datasheet (DS37428 Rev. 6-3, p.5), so minimum input is 1.4V + 1.0V = 2.4V. The recommended operating minimum is 2.5V to ensure margin across temperature and process variation.
Does AP2138R-1.4TRG1 include reverse polarity or overtemperature protection?
No. The AP2138R-1.4TRG1 provides only current-limit protection (50mA short-circuit current) and has no built-in reverse-voltage blocking, thermal shutdown, or overvoltage protection. External protection diodes and thermal design are required for robust system implementation.
Can AP2138R-1.4TRG1 be used with tantalum output capacitors?
No. The datasheet specifies stability only with ceramic capacitors (1µF, ESR 0.01–100Ω). Tantalum capacitors typically exhibit higher ESR and potential surge current risks during power-up, which may cause oscillation or startup failure. Ceramic is mandatory for guaranteed performance.
Is AP2138R-1.4TRG1 pin-compatible with AP2139 variants?
No. AP2138R-1.4TRG1 uses SOT-23-3 (VIN-VOUT-GND), while AP2139 variants use SOT-23-5 (CE-NC-VIN-VOUT-GND). The pin count, function mapping, and enable control differ fundamentally-direct replacement is electrically and mechanically incompatible.
AP2138R-1.4TRG1 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):
- 1.4V
- 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-89-3
AP2138R-1.4TRG1 FAQ
1.How can I place an order for AP2138R-1.4TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-1.4TRG1 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-1.4TRG1 reliable?
The price and inventory of AP2138R-1.4TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138R-1.4TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-1.4TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-1.4TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-1.4TRG1?
AP2138R-1.4TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-1.4TRG1 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-1.4TRG1?
For technical support, including AP2138R-1.4TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-1.4TRG1 requirements.
6.How does Aetrix verify that AP2138R-1.4TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-1.4TRG1 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-1.4TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-1.4TRG1?
All AP2138R-1.4TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-1.4TRG1, 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-1.4TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-1.4TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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