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Diodes Incorporated AP2139AK-1.2TRG1
- Part No.:
- AP2139AK-1.2TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2139AK-1.2TRG1.pdf
- Description:
- IC REG LINEAR 1.2V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP2139AK-1.2TRG1 from Diodes Incorporated is a fixed-output 1.2V ultra-low-quiescent-current CMOS LDO regulator in SOT-23-5 package, featuring 1.0µA typical IQ, ±2% output voltage accuracy, and active quick-discharge functionality enabled via logic-controlled CE pin. It delivers up to 250mA output current with 25mV typical dropout at 10mA load and is optimized for battery-powered portable electronics requiring long standby life.
For engineers reviewing the AP2139AK-1.2TRG1 datasheet, AP2139AK-1.2TRG1 pinout, AP2139AK-1.2TRG1 application, or AP2139AK-1.2TRG1 equivalent, key selection criteria include quiescent current under light load, enable threshold compatibility, output discharge behavior, and thermal performance in SOT-23-5 footprint.
Technical Context
The AP2139AK-1.2TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.2V output, and current-limit protection. Its CE input enables logic-level control (VIH = 1.2V min, VIL = 0.3V max) and triggers fast output discharge when disabled.
Designed for low-noise, low-power systems, it operates across -40°C to +85°C ambient temperature with input voltage range 2.5V–6.0V and maintains ±100ppm/°C output voltage temperature coefficient. The internal architecture supports ceramic output capacitors ≥1µF (ESR 0.01Ω–100Ω) for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.200V ±2% - ensures stable core voltage for low-power MCUs and sensors without external feedback. |
| Quiescent Current | 1.0µA typical - extends battery life in always-on or sleep-mode applications such as IoT endpoints. |
| Standby Current | 0.1µA typical - minimizes leakage during system shutdown when CE = low. |
| Dropout Voltage | 25mV typical at 10mA - enables regulation from 1.225V input, critical for single-cell Li-ion or NiMH operation. |
| Output Current | 250mA maximum - supports moderate-power peripherals like BLE radios or display drivers. |
| Line Regulation | 6mV typical - maintains tight output stability despite battery voltage sag from 2.5V to 6.0V input. |
| Load Regulation | 25mV typical (1–100mA) - ensures consistent voltage delivery across dynamic load steps. |
| Temp Coefficient | ±100ppm/°C - guarantees <±1.2mV drift over full operating temperature range. |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, surface-mount, lead-free, RoHS-compliant. Thermal resistance θJA = 250°C/W, θJC = 81.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Active-high enable input; drives internal discharge FET when low, pulling VOUT to GND rapidly. |
| 2 | NC | No internal connection; must be left unconnected or tied to GND per layout guidelines. |
| 3 | VIN | Main input supply (2.5–6.0V); requires ≥1µF ceramic decoupling capacitor close to pin. |
| 4 | VOUT | Regulated 1.2V output; requires ≥1µF ceramic capacitor (ESR 0.01–100Ω) for loop stability. |
| 5 | GND | Power ground reference; must be connected to low-impedance PCB ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical enables >10-year battery life in 10µA average-load IoT sensors. |
| Active quick output discharge | Discharges VOUT to GND within microseconds upon CE deactivation, preventing back-powering of upstream circuitry. |
| Logic-compatible enable input | VIH = 1.2V min allows direct interfacing with 1.8V/3.3V GPIOs without level-shifting. |
| High output accuracy | ±2% tolerance ensures reliable operation of 1.2V I/O domains in modern microcontrollers and PMICs. |
| Low dropout at light loads | 25mV dropout at 10mA permits use with aging batteries down to 1.225V input while maintaining regulation. |
Applications
| Wearable Health Monitor | Smart Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing with Bluetooth LE transmission in wrist-worn device. IC Role / Device Role / Timing Role: Primary 1.2V supply for ultra-low-power MCU and analog front-end, enabled only during measurement bursts. Use Value: 0.1µA standby current prevents battery drain during 99% idle time; quick discharge avoids sensor bias errors on wake-up. |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) reporting hourly via LoRaWAN. IC Role / Device Role / Timing Role: Stable 1.2V rail for ADC, RF transceiver, and real-time clock during brief active intervals. Use Value: 1.0µA quiescent current enables >5-year CR2032 battery life; ±2% accuracy ensures calibrated sensor readings. |
| Industrial Remote Controller | Portable Diagnostic Tool |
Use Scenario: Handheld IR/RF remote with LCD and tactile feedback, powered by two AAA cells. IC Role / Device Role / Timing Role: Regulated 1.2V source for microcontroller and display driver, activated on button press. Use Value: 25mV dropout allows operation until battery drops to 1.225V; CE pin synchronizes power with user interaction. |
Use Scenario: Field-deployable medical diagnostic module using rechargeable Li-ion and USB-C charging. IC Role / Device Role / Timing Role: Clean 1.2V supply for precision analog signal chain and low-noise ADC reference. Use Value: ±100ppm/°C tempco ensures <±1.2mV output shift across -20°C to +70°C operating range; ceramic cap compatibility simplifies layout. |
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 |
|---|---|---|---|
| AP7354-12SAG-7 | Successor device: 1.2V, 300mA, 0.6µA IQ, same SOT-23-5 package, AEC-Q100 qualified. | Supports automotive-grade reliability and extended temperature range (-40°C to +125°C). | Select for new designs requiring longer product lifecycle support and automotive qualification. |
| MCP1700T-1202E/TT | 1.2V, 250mA, 1.6µA IQ, SOT-23-3 package, no enable or discharge function. | Lacks CE control and quick discharge; requires external circuitry for power sequencing. | Choose only if board space constraints favor 3-pin package and enable/discharge are unnecessary. |
Compared with AP7354-12SAG-7, the AP2139AK-1.2TRG1 offers proven field reliability but lacks AEC-Q100 qualification and has higher quiescent current; versus MCP1700T-1202E/TT, it provides integrated enable and discharge at the cost of one extra pin and slightly larger footprint.
Availability
AP2139AK-1.2TRG1 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial remote controllers, and portable diagnostic tools requiring stable component supply with long-term availability assurance.
Supply support for AP2139AK-1.2TRG1 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, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP2139 series belongs to Diodes' ultra-low-IQ LDO portfolio, engineered specifically for battery-constrained portable electronics where multi-year operational life and precise low-voltage regulation are mandatory.
FAQ
What is the minimum input voltage required for regulation at 1.2V output?
The AP2139AK-1.2TRG1 maintains regulation down to VIN = VOUT + VDROP. At 10mA load, typical dropout is 25mV, so minimum input is 1.225V. At 100mA, dropout rises to 200mV, requiring ≥1.4V input. Full specification applies only above 2.5V input per Recommended Operating Conditions.
Does the NC pin (Pin 2) require any PCB routing or grounding?
No. Pin 2 is internally unconnected and must remain floating. Diodes Incorporated's datasheet explicitly states it is "No connection" - routing to GND or any other net may cause unpredictable behavior or violate thermal derating assumptions. Leave it unconnected on the PCB.
Can the AP2139AK-1.2TRG1 drive a 10µF ceramic output capacitor?
Yes. The device is stable with ceramic capacitors from 1µF to ≥10µF, provided ESR remains between 0.01Ω and 100Ω. A 10µF X7R ceramic capacitor meets this requirement and improves transient response without compromising stability - no series resistor needed.
Is the quick discharge function automatic or controllable?
The quick discharge function is fully automatic and triggered solely by CE pin transition from high to low. No external components or configuration are required - the internal FET activates immediately upon CE deassertion, discharging VOUT to GND within microseconds without software intervention.
AP2139AK-1.2TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 1.5 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2139AK-1.2TRG1 FAQ
1.How can I place an order for AP2139AK-1.2TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2139AK-1.2TRG1 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 AP2139AK-1.2TRG1 reliable?
The price and inventory of AP2139AK-1.2TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2139AK-1.2TRG1 is usually 5 days.
3.What payment methods are accepted for AP2139AK-1.2TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2139AK-1.2TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2139AK-1.2TRG1?
AP2139AK-1.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2139AK-1.2TRG1 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 AP2139AK-1.2TRG1?
For technical support, including AP2139AK-1.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2139AK-1.2TRG1 requirements.
6.How does Aetrix verify that AP2139AK-1.2TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2139AK-1.2TRG1 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 AP2139AK-1.2TRG1 meets industry standards.
7.What is the process for return or replacement of AP2139AK-1.2TRG1?
All AP2139AK-1.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2139AK-1.2TRG1, 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 AP2139AK-1.2TRG1 part is unused and in its original packaging.
Return procedure for AP2139AK-1.2TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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