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Diodes Incorporated AP2139AK-2.8TRG1
- Part No.:
- AP2139AK-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2139AK-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,990
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Product details
Overview
AP2139AK-2.8TRG1 from Diodes Incorporated is a fixed-output 2.8V, 250mA ultra-low-quiescent-current CMOS LDO regulator in SOT-23-5 package, featuring active high enable (CE), quick output discharge, ±2% output voltage accuracy, and 1.0µA typical quiescent current-designed for battery-powered portable AV systems requiring stable low-power voltage regulation.
For engineers reviewing the AP2139AK-2.8TRG1 datasheet, AP2139AK-2.8TRG1 pinout, AP2139AK-2.8TRG1 application, or AP2139AK-2.8TRG1 equivalent, key selection criteria include enable logic compatibility, dropout performance at 100mA load, standby current under shutdown, thermal resistance in SOT-23-5, and stability with 1µF ceramic output capacitance.
Technical Context
The AP2139AK-2.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, and current-limit protection. Its CE input enables logic-controlled on/off operation with 1.2V VIH and 0.3V VIL thresholds, while internal discharge circuitry actively pulls VOUT to GND when disabled.
It operates across 2.5V–6.0V input range with guaranteed 250mA output capability, maintains ±100ppm/°C temperature coefficient, and achieves 25mV typical dropout at 10mA load-enabling efficient regulation in space-constrained, low-power embedded systems where supply headroom is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8V ±2% - ensures stable rail for 2.8V logic or analog circuitry without external feedback |
| Quiescent Current | 1.0µA typical - extends battery life in always-on sensor nodes or standby modes |
| Standby Current | 0.1µA typical - minimizes leakage during CE-driven shutdown |
| Dropout Voltage | 25mV @ 10mA - supports regulation from 2.825V input, critical for single-cell Li-ion or NiMH systems |
| Output Current | 250mA - sufficient for powering microcontrollers, RF modules, or small displays |
| Line Regulation | 6mV typical - limits output variation across 3.8V–6.0V input range, improving system robustness |
| Load Regulation | 25mV typical - maintains tight voltage control from 1mA to 100mA load steps |
| Thermal Resistance | 81.9°C/W (θJC) - enables predictable junction temperature rise under continuous 250mA load in SOT-23-5 |
Pinout & Package
SOT-23-5 package with exposed pad (RoHS-compliant, lead-free, halogen-free "Green" construction).
| 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 tied to GND per layout guidelines |
| 3 | VIN | Main power input (2.5–6.0V); requires ≥1µF ceramic decoupling capacitor |
| 4 | VOUT | Regulated 2.8V output; stable with ≥1µF ceramic capacitor (ESR 0.01–100Ω) |
| 5 | GND | Power ground reference; connects to PCB thermal pad for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - reduces no-load power loss in energy-harvesting or coin-cell applications |
| Quick output discharge | Active CE-controlled discharge path - eliminates hold-up time, enabling safe sequencing in multi-rail systems |
| Logic-compatible enable | VIH = 1.2V, VIL = 0.3V - interfaces directly with 1.8V/3.3V GPIO without level-shifting |
| High output accuracy | ±2% over -40°C to +85°C - avoids calibration overhead in precision analog signal chains |
| Low-temperature drift | ±100ppm/°C - maintains voltage stability across industrial temperature ranges |
| Stable with ceramic capacitors | Supports 1µF output cap (0.01–100Ω ESR) - simplifies BOM and PCB layout vs. tantalum-dependent LDOs |
Applications
| Portable AV Systems | Mobile Phones |
|---|---|
|
Use Scenario: Powering audio codecs and camera sensor interfaces in compact handheld devices. IC Role / Device Role / Timing Role: Primary 2.8V supply for low-noise analog front-end circuits requiring minimal ripple and fast transient response. Use Value: 25mV dropout at 10mA enables operation down to 2.825V input, extending usable battery range by ~5% in single-cell Li-ion systems. |
Use Scenario: Biasing RF power amplifiers and baseband processors during low-power sleep states. IC Role / Device Role / Timing Role: Always-on LDO delivering 2.8V to real-time clock and memory retention circuits. Use Value: 0.1µA standby current prevents measurable battery drain during 72-hour idle periods in cellular standby mode. |
| Wireless Sensors | Wearable Health Monitors |
|
Use Scenario: Regulating power for BLE SoCs and environmental sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Enable-controlled power domain manager that synchronizes with MCU wake/sleep cycles. Use Value: CE input with 1.2V VIH allows direct interface with 1.8V I/O domains, eliminating external level shifters and reducing component count. |
Use Scenario: Supplying optical heart-rate sensors and low-power ADCs in wrist-worn devices. IC Role / Device Role / Timing Role: Precision 2.8V reference source with <±2% tolerance for analog signal conditioning. Use Value: ±100ppm/°C temperature coefficient ensures <±0.24% output drift across -20°C to +50°C wearable operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-28SA-7 | Successor device; 2.8V, 300mA, 0.6µA IQ, improved PSRR and transient response | Recommended for new designs; supports higher load currents and tighter noise-sensitive analog rails | Select when upgrading legacy AP2139-based designs for extended battery life and enhanced stability |
| MCP1700T-2802E/TT | 2.8V, 250mA, 1.6µA IQ, no enable pin, SOT-23-3 package | Lacks CE and quick discharge; suitable only for always-on, space-constrained applications | Choose only if board layout prohibits SOT-23-5 or enable functionality is unnecessary |
Compared with AP2139AK-2.8TRG1, AP7354-28SA-7 delivers lower quiescent current and higher output capability but requires revalidation of enable timing and thermal layout; MCP1700T-2802E/TT offers footprint compatibility but sacrifices controllability and discharge safety in sequenced power systems.
Availability
AP2139AK-2.8TRG1 is available at Aetrix Electronics and suitable for portable AV systems, wireless sensors, wearable health monitors, and mobile phone subsystems requiring stable component supply with long-term lifecycle visibility.
Supply support for AP2139AK-2.8TRG1 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, automotive, and consumer markets.
The AP2138/2139 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for battery-powered portable electronics where extended runtime, small form factor, and precise voltage regulation are critical design requirements.
FAQ
What is the minimum input voltage required for AP2139AK-2.8TRG1 to regulate at 2.8V?
The AP2139AK-2.8TRG1 requires VIN ≥ 2.5V per recommended operating conditions. At 10mA load, its typical dropout is 25mV, so regulation is maintained down to 2.825V input. Below 2.5V, output voltage drops linearly and specification guarantees no longer apply.
Does AP2139AK-2.8TRG1 require an external capacitor on the CE pin?
No external capacitor is required on the CE pin. The CE input is CMOS-compatible with standard logic thresholds (VIH = 1.2V, VIL = 0.3V) and includes internal pull-down current of 0.2µA. A simple MCU GPIO or open-drain driver suffices for reliable enable/disable control.
Can AP2139AK-2.8TRG1 be used with a 0.47µF output capacitor?
No. The datasheet specifies a minimum 1µF ceramic output capacitor with ESR between 0.01Ω and 100Ω for stability. Using 0.47µF risks oscillation or poor transient response, especially under load steps-verified in typical application circuits and stability testing.
Is AP2139AK-2.8TRG1 qualified for automotive applications?
AP2139AK-2.8TRG1 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require separate qualification (e.g., PPAP, IATF 16949 manufacturing), and this part is intended for commercial/industrial portable equipment-not automotive ECUs or infotainment systems.
AP2139AK-2.8TRG1 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 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-2.8TRG1 FAQ
1.How can I place an order for AP2139AK-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2139AK-2.8TRG1 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-2.8TRG1 reliable?
The price and inventory of AP2139AK-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2139AK-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2139AK-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2139AK-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2139AK-2.8TRG1?
AP2139AK-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2139AK-2.8TRG1 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-2.8TRG1?
For technical support, including AP2139AK-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2139AK-2.8TRG1 requirements.
6.How does Aetrix verify that AP2139AK-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2139AK-2.8TRG1 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-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2139AK-2.8TRG1?
All AP2139AK-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2139AK-2.8TRG1, 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-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2139AK-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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