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Diodes Incorporated AP2138N-1.4TRG1
- Part No.:
- AP2138N-1.4TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-1.4TRG1.pdf
- Description:
- IC REG LINEAR 1.4V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,987
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Product details
Overview
AP2138N-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-constrained portable systems.
For engineers reviewing the AP2138N-1.4TRG1 datasheet, AP2138N-1.4TRG1 pinout, AP2138N-1.4TRG1 application, or AP2138N-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 architecture enables ultra-low IQ and tight load/line regulation-6mV typical line regulation and 25mV typical load regulation-making it suitable for noise-sensitive analog rails.
The device operates across -40°C to +85°C ambient temperature with input voltage range 2.4V–6.0V, and features internal current limiting and thermal shutdown. Unlike the AP2139, it lacks enable and quick-discharge functionality, confirming its role as a simple, always-on regulator for cost- and space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.400V ±2% - ensures stable core voltage for 1.4V logic or sensor biasing within tolerance |
| Quiescent Current | 1.0µA typical - extends battery life in standby mode for multi-year IoT sensor deployments |
| Max Output Current | 250mA - supports moderate-load peripherals like BLE SoCs or small displays |
| Dropout Voltage | 100mV typical at 10mA - enables operation down to VIN = 1.5V, critical for single-cell Li-ion or alkaline systems |
| Load Regulation | 25mV typical (1–100mA) - maintains voltage stability during dynamic current steps in portable audio ICs |
| Line Regulation | 6mV typical (2.4–6.0V VIN) - rejects input ripple from switching converters feeding the LDO |
| Temp Coefficient | ±100ppm/°C - limits output drift to ±1.17mV over -40°C to +85°C for precision reference use |
Pinout & Package
SOT-23-3 package: 3-pin surface-mount plastic package with exposed pad for thermal dissipation; JEDEC TO-236AB compliant; footprint compatible with standard pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; requires ≥1µF ceramic capacitor for stability and transient response |
| 2 | VOUT | Regulated 1.4V output; must be decoupled with ≥1µF ceramic capacitor (ESR 0.01–100Ω) |
| 3 | GND | Power ground reference; low-impedance return path essential for noise immunity and thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - enables >10-year battery life in coin-cell-powered wearables |
| Fixed 1.4V output | No external resistors required - reduces BOM count and layout area in space-limited PCBs |
| High output accuracy | ±2% over temperature and line/load - eliminates need for post-regulation trimming in medical sensor front-ends |
| Low dropout voltage | 100mV at 10mA - allows direct regulation from partially discharged 1.5V alkaline cells |
| Thermal protection | Internal shutdown at TJ ≥150°C - prevents damage during sustained overload or poor heatsinking |
Applications
| Portable Medical Sensors | Low-Power Microcontroller Core Supply |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and analog front-end IC. IC Role / Device Role / Timing Role: Primary 1.4V bias supply for op-amp and ADC reference circuitry. Use Value: 1.0µA IQ and ±2% accuracy ensure >5-year shelf life and <0.5% measurement error over temperature. |
Use Scenario: Sub-1GHz wireless MCU (e.g., Nordic nRF52) in Bluetooth beacon with intermittent transmit duty cycle. IC Role / Device Role / Timing Role: Always-on VDD_IO rail powering GPIO, RTC, and wake-up comparators. Use Value: 100mV dropout enables operation down to 1.5V VIN, extending usable battery range by 12% vs. higher-IQ alternatives. |
| Wearable Fitness Tracker | Industrial Wireless Node Sensor Bias |
Use Scenario: Optical heart-rate sensor module powered by CR2032 battery. IC Role / Device Role / Timing Role: Stable 1.4V supply for photodiode transimpedance amplifier and LED driver bias. Use Value: ±100ppm/°C tempco ensures consistent optical gain calibration across -10°C to +50°C wearable operating range. |
Use Scenario: LoRaWAN node with MEMS accelerometer and ultra-low-power MCU in remote monitoring cabinet. IC Role / Device Role / Timing Role: Precision 1.4V reference for internal ADC and analog comparator thresholds. Use Value: 25mV load regulation minimizes code shift during sensor self-test pulses, improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-14SAG-7 | Successor LDO: 1.4V output, 300mA rating, 0.6µA IQ, SOT-23-3, AEC-Q100 qualified | Supports automotive-grade reliability and higher load margin; includes thermal foldback | Select for new designs requiring extended lifecycle support and IATF 16949 traceability |
| MCP1700T-1402E/TT | 1.4V output, 250mA, 1.6µA IQ, SOT-23-3, ±2% accuracy, but higher dropout (178mV @10mA) | Lacks Diodes' 100mV dropout advantage; wider tempco (±200ppm/°C) | Acceptable only if board-level thermal design accommodates higher power loss |
Compared with AP2138N-1.4TRG1, AP7354-14SAG-7 offers lower IQ and automotive qualification but requires validation for legacy footprint compatibility; MCP1700T-1402E/TT trades off dropout and tempco for Microchip's broader distributor availability.
Availability
AP2138N-1.4TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, low-power microcontroller core supplies, and industrial wireless node sensor bias requiring stable component supply and long-term obsolescence management.
Supply support for AP2138N-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and environmental standards including RoHS 3 and halogen-free compliance.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, designed specifically for battery-powered portable electronics where runtime, size, and precision regulation are critical constraints.
FAQ
What is the maximum input voltage for AP2138N-1.4TRG1?
The absolute maximum input voltage is 6.6V, but the recommended operating range is 2.4V to 6.0V. Operation above 6.0V risks permanent damage and violates the Absolute Maximum Ratings specified in DS37428 Rev. 6-3. For reliable long-term performance, VIN should remain ≤6.0V under all conditions including transient spikes.
Does AP2138N-1.4TRG1 have an enable pin?
No. AP2138N-1.4TRG1 is part of the AP2138 series and does not include an enable (CE) function. The AP2139 series provides CE and quick-discharge capability; this part is always-on and lacks logic control. Pin 1 is VIN, pin 2 is VOUT, and pin 3 is GND-no dedicated enable terminal exists.
What output capacitor is required for stability?
A minimum 1µF ceramic capacitor with ESR between 0.01Ω and 100Ω is required at the VOUT pin. Diodes recommends X5R or X7R dielectrics for temperature stability. Input also requires ≥1µF ceramic capacitance. Using smaller or higher-ESR capacitors may cause oscillation or poor transient response per DS37428 Section 4.
Is AP2138N-1.4TRG1 recommended for new designs?
No. Diodes explicitly states "THE AP2138/2139 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7354." This notice appears on page 3 of DS37428 Rev. 6-3. While AP2138N-1.4TRG1 remains available for legacy support and existing production, new designs should migrate to AP7354-14SAG-7 for improved specs and long-term supply assurance.
AP2138N-1.4TRG1 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):
- 1.4V
- 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-23-3
AP2138N-1.4TRG1 FAQ
1.How can I place an order for AP2138N-1.4TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-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 AP2138N-1.4TRG1 reliable?
The price and inventory of AP2138N-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 AP2138N-1.4TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-1.4TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-1.4TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-1.4TRG1?
AP2138N-1.4TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-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 AP2138N-1.4TRG1?
For technical support, including AP2138N-1.4TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-1.4TRG1 requirements.
6.How does Aetrix verify that AP2138N-1.4TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-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 AP2138N-1.4TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-1.4TRG1?
All AP2138N-1.4TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-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 AP2138N-1.4TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-1.4TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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