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Diodes Incorporated AP2139AK-2.5TRG1
- Part No.:
- AP2139AK-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2139AK-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 250MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,101
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Product details
Overview
AP2139AK-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5V CMOS low-dropout (LDO) voltage regulator with enable control and active quick-discharge functionality, designed for ultra-low-power battery-powered systems. It delivers up to 250mA output current, features 1.0µA typical quiescent current, ±2% output voltage accuracy, and 25mV typical dropout at 10mA load - enabling extended runtime in portable AV systems and mobile phones.
For engineers reviewing the AP2139AK-2.5TRG1 datasheet, AP2139AK-2.5TRG1 pinout, AP2139AK-2.5TRG1 application, or AP2139AK-2.5TRG1 equivalent, key selection criteria include enable logic compatibility, standby current (<0.1µA), dropout behavior at light-to-moderate loads, and SOT-23-5 thermal performance under ambient temperatures from –40°C to +85°C.
Technical Context
The AP2139AK-2.5TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.5V regulation, and current-limit protection. Its CE pin enables logic-controlled shutdown with 0.1µA standby current and active pull-down discharge of VOUT via internal NMOS path when disabled.
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). Dropout voltage scales predictably: 25mV @ 10mA, 100mV @ 30mA, and 250mV @ 100mA - critical for maintaining regulation during battery voltage sag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable supply for 2.5V logic rails and analog sensors without external feedback. |
| Quiescent Current | 1.0µA typical - minimizes battery drain in always-on monitoring circuits and sleep-mode subsystems. |
| Standby Current | 0.1µA typical (CE = low) - enables deep-sleep power gating in portable devices with rapid wake-up capability. |
| Dropout Voltage | 25mV @ IOUT = 10mA - sustains regulation down to VIN = 2.525V, supporting single-cell Li-ion or 3×AA alkaline operation. |
| Output Current | 250mA maximum - sufficient for powering microcontrollers, RF transceivers, or small displays in compact form factors. |
| Line Regulation | 6mV typical (2.5V ≤ VIN ≤ 6V) - maintains tight output stability despite battery voltage decay or input ripple. |
| Load Regulation | 25mV typical (1mA–100mA) - ensures consistent voltage delivery across dynamic load transitions in portable equipment. |
Pinout & Package
SOT-23-5 package with exposed pad (thermal enhancement), footprint-compatible with JEDEC MO-178AB standard. Pin 1 = CE (active-high enable), Pin 2 = NC (no connection), Pin 3 = VIN, Pin 4 = VOUT, Pin 5 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CE) | Enable control input | Logic-high (>1.2V) enables regulator; logic-low (<0.3V) disables output and activates internal discharge path. |
| 2 (NC) | No connection | Unbonded die pad - must be left floating or connected to GND per layout best practices; no electrical function. |
| 3 (VIN) | Input voltage supply | Accepts 2.5V–6.0V DC input; requires ≥1µF ceramic capacitor placed near pin for stability and transient response. |
| 4 (VOUT) | Regulated output | Delivers 2.5V ±2% to load; internal quick-discharge circuit pulls VOUT to GND within microseconds upon CE deactivation. |
| 5 (GND) | Power ground reference | Primary return path for input/output currents; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - extends battery life in IoT sensors and wearables operating for months on coin cells. |
| Active quick output discharge | Internal NMOS path discharges VOUT to GND in <100µs after CE deactivation - prevents residual voltage from interfering with downstream sequencing. |
| Logic-controlled enable | CE input compatible with 1.2V logic-high threshold - interfaces directly with GPIOs of 1.8V/3.3V MCUs without level-shifting. |
| High output accuracy | ±2% over –40°C to +85°C - eliminates need for post-regulation trimming in cost-sensitive consumer electronics. |
| Low temperature coefficient | ±100ppm/°C - limits output drift to ±250µV/°C at 2.5V, critical for precision ADC references and sensor biasing. |
Applications
| Portable AV Systems | Mobile Phones |
|---|---|
|
Use Scenario: Powering audio codecs and camera modules in handheld camcorders with dual-cell alkaline supply. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying analog front-end circuitry with fast enable/disable for power cycling between recording and standby. Use Value: 0.1µA standby current extends idle time beyond 12 months; 25mV dropout preserves regulation as battery decays from 3.2V to 2.525V. |
Use Scenario: Biasing RF power amplifiers and baseband processors during LTE transmission bursts. IC Role / Device Role / Timing Role: Secondary LDO delivering clean 2.5V rail isolated from noisy PMIC outputs, enabled synchronously with transmit events. Use Value: 250mA output handles peak PA current; quick-discharge prevents latch-up during rapid mode switching between TX/RX states. |
| Battery-Powered Medical Sensors | Wireless Remote Controls |
|
Use Scenario: Supplying ECG signal conditioning circuitry in disposable patch monitors powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Always-on 2.5V regulator for analog front-end, entering ultra-low-power standby between measurement intervals. Use Value: 1.0µA quiescent current enables >3-year shelf life; ±2% accuracy ensures consistent ADC full-scale calibration across temperature. |
Use Scenario: Powering IR LED drivers and sub-GHz transceivers in energy-harvesting remotes using solar-charged thin-film batteries. IC Role / Device Role / Timing Role: Enable-gated LDO providing regulated 2.5V only during button-press transmission windows. Use Value: CE-controlled shutdown reduces average current to <50nA; 250mA surge capability drives high-brightness IR pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-25SA-7 | Successor device: 250mA, 2.5V, 0.6µA IQ, SOT-23-5, AEC-Q100 qualified | Designed for automotive infotainment and ADAS modules requiring PPAP support and IATF 16949 manufacturing | Select for new designs targeting automotive qualification; not drop-in due to different enable polarity (active-low). |
| MCP1700T-2502E/TT | 250mA, 2.5V, 1.6µA IQ, SOT-23-5, no quick-discharge, higher dropout (115mV @ 100mA) | Used in industrial controllers where enable sequencing is handled externally and discharge is managed by system-level FETs | Choose when quick-discharge is unnecessary and lower cost is prioritized over ultra-low IQ and discharge speed. |
Compared with AP2139AK-2.5TRG1, AP7354-25SA-7 offers superior quiescent current and automotive compliance but requires redesign for active-low enable, while MCP1700T-2502E/TT trades off discharge capability and dropout for broader distributor availability and legacy design continuity.
Availability
AP2139AK-2.5TRG1 is available at Aetrix Electronics and suitable for portable AV systems, battery-powered medical sensors, and wireless remote controls requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP2139AK-2.5TRG1 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 ICs for power management, signal integrity, and connectivity applications.
The AP2139 series belongs to Diodes' ultra-low-IQ LDO portfolio, engineered specifically for battery-constrained portable electronics where multi-year operation and rapid power-state transitions are mandatory.
FAQ
What is the minimum input voltage required for AP2139AK-2.5TRG1 to maintain regulation at full 250mA load?
The datasheet specifies a maximum dropout voltage of 1000mV at 250mA output. With a nominal 2.5V output, the minimum functional input voltage is 3.5V under worst-case conditions. At typical performance (650mV dropout), VIN ≥ 3.15V sustains regulation - verified across –40°C to +85°C junction temperature range with 1µF ceramic output capacitance.
Can AP2139AK-2.5TRG1 be used with tantalum output capacitors?
No. The AP2139AK-2.5TRG1 requires output capacitors with ESR between 0.01Ω and 100Ω for stability, and ceramic capacitors are explicitly recommended. Tantalum capacitors typically exhibit ESR below 0.01Ω and lack the necessary phase margin - risking oscillation. Only X5R/X7R MLCCs rated ≥1µF and 6.3V are validated for use.
Is the NC pin (Pin 2) required to be grounded or left floating?
Pin 2 is an unconnected die pad with no internal bond wire. Diodes Incorporated's layout guidelines state it may be left floating or tied to GND for mechanical stability and improved thermal conduction - but grounding is not electrically required. PCB copper pour under the exposed pad should connect to GND regardless of Pin 2 routing.
Does AP2139AK-2.5TRG1 support reverse-voltage protection?
No. The device lacks internal reverse-polarity protection. If reverse input voltage exceeding –0.3V is possible (e.g., during hot-swap or battery insertion), an external series Schottky diode or ideal diode controller must be added. Reverse output voltage is also unguarded - back-driving VOUT while CE is low can damage the internal discharge MOSFET.
AP2139AK-2.5TRG1 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 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-2.5TRG1 FAQ
1.How can I place an order for AP2139AK-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2139AK-2.5TRG1 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-2.5TRG1 reliable?
The price and inventory of AP2139AK-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2139AK-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2139AK-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2139AK-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2139AK-2.5TRG1?
AP2139AK-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2139AK-2.5TRG1 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-2.5TRG1?
For technical support, including AP2139AK-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2139AK-2.5TRG1 requirements.
6.How does Aetrix verify that AP2139AK-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2139AK-2.5TRG1 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-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2139AK-2.5TRG1?
All AP2139AK-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2139AK-2.5TRG1, 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-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2139AK-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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