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Diodes Incorporated AP2139AK-3.3TRG1
- Part No.:
- AP2139AK-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2139AK-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:238,177
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Product details
Overview
AP2139AK-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V CMOS low-dropout (LDO) regulator with enable control and active quick discharge, designed for ultra-low-power portable systems. It delivers 250mA output current, maintains ±2% output voltage accuracy, achieves 20mV typical dropout at 10mA load, and draws only 1.0µA quiescent current-enabling multi-year battery life in always-on sensor nodes and wearables.
For engineers reviewing the AP2139AK-3.3TRG1 datasheet, AP2139AK-3.3TRG1 pinout, AP2139AK-3.3TRG1 application, or AP2139AK-3.3TRG1 equivalent, key selection criteria include its 0.1µA standby current under shutdown, logic-controlled CE input with 1.2V VIH threshold, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The AP2139AK-3.3TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V regulation, and current-limit protection. Its enable circuit activates the LDO and triggers rapid VOUT discharge via internal NMOS when CE falls low-eliminating external discharge resistors and reducing system wake-up delay.
It operates across 2.5V–6.0V input range with ±100ppm/°C output temperature coefficient and supports ceramic output capacitors ≥1µF (ESR 0.01Ω–100Ω). Thermal shutdown and short-circuit protection ensure robust operation in ambient temperatures from –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±2% - ensures stable MCU core or RF transceiver supply within tight tolerance bands |
| Quiescent Current | 1.0µA typical - enables >10-year battery life in coin-cell-powered IoT endpoints |
| Standby Current | 0.1µA typical - minimizes leakage during deep-sleep modes in wearable sensors |
| Dropout Voltage | 20mV @ IOUT = 10mA - allows operation down to VIN = 3.32V, extending usable battery range |
| Output Current | 250mA maximum - supports moderate-power peripherals like BLE radios or display drivers |
| Line Regulation | 6mV typical - maintains output stability despite battery voltage sag during pulse loads |
| Load Regulation | 25mV typical - limits output shift from no-load to full 250mA, critical for ADC reference stability |
| CE Input Threshold | VIH = 1.2V, VIL = 0.3V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 surface-mount package with exposed thermal pad (pin 3), optimized for compact PCB footprints and thermal performance in handheld devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CE | Active-high enable input; drives internal discharge FET when low, enabling fast VOUT ramp-down |
| 2 | NC | No connection - must be left floating or grounded per layout guidelines; not internally bonded |
| 3 | VIN | Main power input (2.5V–6.0V); requires ≥1µF ceramic capacitor for stability and EMI suppression |
| 4 | VOUT | Regulated 3.3V output; minimum 1µF ceramic capacitor required for loop stability and transient response |
| 5 | GND | Power ground reference; connects to thermal pad for enhanced heat dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - reduces average system current in duty-cycled applications such as environmental sensors |
| Active quick output discharge | Internal NMOS discharges VOUT to GND in <1ms upon CE deactivation - prevents back-powering of upstream circuits |
| Logic-compatible enable input | 1.2V VIH threshold - interoperable with 1.8V I/O domains without external level translators |
| High output voltage accuracy | ±2% over temperature and line/load - eliminates need for post-regulation trimming in precision analog subsystems |
| Low temperature coefficient | ±100ppm/°C - ensures <±0.5% output drift across –40°C to +85°C, critical for battery gauge accuracy |
| RoHS-compliant & halogen-free | Lead-free, antimony-free, Br+Cl <1500ppm - meets automotive and industrial environmental compliance requirements |
Applications
| Wearable Health Monitor | BLE Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 3.3V supply for ultra-low-power MCU and analog front-end, activated only during sampling intervals. Use Value: 0.1µA standby current extends battery life beyond 3 years; quick discharge prevents residual voltage from interfering with next sampling cycle. |
Use Scenario: Battery-operated temperature/humidity node transmitting data every 5 minutes via Bluetooth Low Energy. IC Role / Device Role / Timing Role: Regulated power source for BLE SoC and digital sensors during active transmission bursts. Use Value: 250mA peak current capability supports radio transmit pulses; 20mV dropout preserves runtime as battery voltage drops to 3.32V. |
| Industrial Wireless Transmitter | Smart Meter RTC Backup |
|
Use Scenario: LoRaWAN endpoint in remote utility monitoring, operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Stable 3.3V rail for microcontroller and sub-GHz transceiver in wide-temperature industrial environments. Use Value: ±100ppm/°C tempco and ±2% accuracy maintain timing integrity and ADC linearity across full temperature range. |
Use Scenario: Real-time clock backup supply during main power failure in electricity meters. IC Role / Device Role / Timing Role: Secondary regulated source for RTC IC when main 5V rail is lost. Use Value: Active quick discharge ensures clean reset of RTC on main power restoration; 1.0µA IQ minimizes supercapacitor drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-33SA-7 | Successor device; 300mA output, 0.6µA IQ, improved PSRR, same SOT-23-5 footprint | Designed for new designs requiring longer battery life and higher noise immunity | Select for new projects; offers drop-in replacement with enhanced specs and active lifecycle support |
| MCP1700-3302E/TO | 250mA output, 1.6µA IQ, no enable/discharge, TO-92 through-hole package | Lacks CE control and quick discharge; suited for cost-sensitive, non-battery-critical applications | Choose only if board redesign is impractical and enable functionality is unnecessary |
Compared with AP7354-33SA-7, the AP2139AK-3.3TRG1 provides proven field reliability but lacks newer features like lower IQ and better PSRR; versus MCP1700-3302E/TO, it adds essential enable and discharge control at the cost of slightly higher quiescent current and SMT-only assembly.
Availability
AP2139AK-3.3TRG1 is available at Aetrix Electronics and suitable for battery-powered equipment, portable AV systems, mobile phones, and communication tools requiring stable component supply with long-term availability planning.
Supply support for AP2139AK-3.3TRG1 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 industrial, computing, and consumer markets.
The AP2139 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for extended battery life in portable and energy-harvesting applications where micropower operation and fast enable/disable control are mandatory.
FAQ
What is the minimum input voltage required for stable 3.3V output?
The AP2139AK-3.3TRG1 requires VIN ≥ 3.32V to maintain regulation at 10mA load (20mV dropout), and ≥ 3.6V at 100mA (160mV dropout). Below these thresholds, output voltage drops linearly with input; the absolute minimum VIN is 2.5V, but regulation is not guaranteed below dropout margin.
Can the NC pin (Pin 2) be connected to ground or left floating?
Pin 2 is unconnected internally and must remain floating per Diodes' design guidance. Grounding it may cause unpredictable behavior or increased leakage; the datasheet explicitly states it is not bonded and should not be soldered to any net.
Does the quick discharge function require an external resistor?
No. The quick discharge function is fully integrated: an internal NMOS transistor connects VOUT to GND when CE is low. No external components are needed-this distinguishes AP2139 from AP2138 and eliminates BOM cost and PCB area for discharge networks.
Is AP2139AK-3.3TRG1 qualified for automotive applications?
This specific variant is not AEC-Q100 qualified. Diodes offers automotive-grade versions (e.g., AP2139AK-3.3TRG1-13) with PPAP documentation and IATF 16949 manufacturing, but standard AP2139AK-3.3TRG1 is intended for industrial and consumer use only.
AP2139AK-3.3TRG1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 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-3.3TRG1 FAQ
1.How can I place an order for AP2139AK-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2139AK-3.3TRG1 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-3.3TRG1 reliable?
The price and inventory of AP2139AK-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2139AK-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2139AK-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2139AK-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2139AK-3.3TRG1?
AP2139AK-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2139AK-3.3TRG1 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-3.3TRG1?
For technical support, including AP2139AK-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2139AK-3.3TRG1 requirements.
6.How does Aetrix verify that AP2139AK-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2139AK-3.3TRG1 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-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2139AK-3.3TRG1?
All AP2139AK-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2139AK-3.3TRG1, 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-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2139AK-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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