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Diodes Incorporated AP2138R-2.8TRG1
- Part No.:
- AP2138R-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
AP2138R-2.8TRG1 from Diodes Incorporated is a fixed-output 2.8V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 25mV typical dropout at 10mA load. It serves as a primary power rail for ultra-low-power microcontrollers and sensors in battery-constrained portable devices.
For engineers reviewing the AP2138R-2.8TRG1 datasheet, AP2138R-2.8TRG1 pinout, AP2138R-2.8TRG1 application, or AP2138R-2.8TRG1 equivalent, key selection criteria include its 2.8V fixed output, SOT-23-3 footprint compatibility, 250mA continuous output capability, and guaranteed ±2% regulation across -40°C to +85°C ambient temperature range.
Technical Context
The AP2138R-2.8TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain stable 2.8V output under varying input (2.5–6.0V) and load (0–250mA) conditions. Its CMOS pass element enables ultra-low quiescent current without compromising transient response.
Designed for single-rail operation with no enable control, it relies on internal feedback for regulation and requires ≥1µF ceramic input/output capacitors for stability. Thermal protection is implemented via junction temperature monitoring with 150°C shutdown threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8V ±2% - ensures reliable logic-level supply for 2.8V I/O domains in microcontrollers and sensors |
| Quiescent Current | 1.0µA typical - extends battery life in always-on sensor nodes and wearable devices |
| Dropout Voltage | 25mV typical at 10mA - supports operation down to VIN = 2.825V, enabling use with near-dead Li-ion cells |
| Output Current | 250mA maximum - sufficient for powering ARM Cortex-M0+ MCUs, BLE radios, and analog front-ends |
| Line Regulation | 6mV typical - maintains output stability across 2.5–6.0V input range, critical for multi-cell battery systems |
| Load Regulation | 25mV typical (1–100mA) - limits output shift during dynamic processor load transitions |
| Temp Coefficient | ±100ppm/°C - contributes <±0.24% output drift over -40°C to +85°C, supporting precision analog sensing |
Pinout & Package
SOT-23-3 package with exposed pad (R suffix), footprint-compatible with JEDEC TO-236AB standard; thermal resistance θJA = 250°C/W, θJC = 81.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input voltage supply pin; accepts 2.5–6.0V; requires ≥1µF ceramic decoupling capacitor |
| 2 | VOUT | Regulated 2.8V output; must be bypassed with ≥1µF ceramic capacitor (ESR 0.01–100Ω) |
| 3 | GND | Power ground reference; connects to PCB ground plane for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - enables >1-year battery life in coin-cell-powered IoT endpoints |
| High output accuracy | ±2% over full temperature and load range - eliminates need for external trimming in cost-sensitive designs |
| Low dropout performance | 25mV at 10mA - allows direct regulation from single Li-ion (2.8–4.2V) without pre-regulation stage |
| Stable with ceramic capacitors | Supports 1µF output capacitance (0.01–100Ω ESR) - reduces BOM count and board space vs. tantalum alternatives |
| Thermal shutdown protection | Activates at TJ = +150°C - prevents damage during sustained overload or poor PCB thermal design |
Applications
| Wearable Health Monitors | Industrial Wireless Sensors |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 2.8V supply for analog front-end and low-power MCU. Use Value: 1.0µA quiescent current enables >2-year battery life; ±2% accuracy ensures consistent ADC reference stability. |
Use Scenario: Battery-operated vibration sensor node in predictive maintenance system. IC Role / Device Role / Timing Role: Power source for MEMS accelerometer and sub-GHz RF transceiver. Use Value: 25mV dropout allows operation down to 2.825V input, extending usable battery range by 15% vs. higher-dropout LDOs. |
| Portable Medical Diagnostic Tools | Smart Home Motion Detectors |
Use Scenario: Handheld pulse oximeter using AAA alkaline batteries. IC Role / Device Role / Timing Role: Regulated 2.8V rail for optical sensor array and display driver IC. Use Value: Stable 2.8V output ensures consistent LED drive current and photodiode biasing across battery discharge curve. |
Use Scenario: PIR-based occupancy sensor with integrated MCU and Zigbee radio. IC Role / Device Role / Timing Role: Main power regulator for sleep-mode logic and wake-up circuitry. Use Value: Low 250°C/W θJA enables operation in sealed plastic enclosures without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-28W5-7 | 2.8V, 300mA, 0.6µA IQ, SOT-23-3 - lower quiescent current and higher output current | Recommended for new designs per Diodes' notice; supports longer battery life and higher peak loads | Select when upgrading legacy AP2138 designs requiring improved efficiency or headroom |
| MCP1700T-2802E/TT | 2.8V, 250mA, 1.6µA IQ, SOT-23-3 - slightly higher quiescent current, same package and output | Microchip's automotive-qualified variant with AEC-Q100 Grade 3 support | Choose for automotive-grade compliance where AP2138R-2.8TRG1 lacks qualification |
Compared with AP2138R-2.8TRG1, AP7354-28W5-7 offers superior efficiency for next-gen designs, while MCP1700T-2802E/TT provides certified reliability for automotive environments - neither is pin- or functionally identical, requiring validation of startup behavior and load transient response.
Availability
AP2138R-2.8TRG1 is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial wireless sensors, portable diagnostic tools, and smart home motion detectors requiring stable component supply and long-term obsolescence management.
Supply support for AP2138R-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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for extended battery life in portable and energy-harvesting applications where standby power dominates total system consumption.
FAQ
What is the minimum input voltage required for AP2138R-2.8TRG1 to maintain regulation?
The minimum input voltage is 2.825V, calculated as VOUT + VDROP(max) = 2.8V + 25mV (typical at 10mA). At 100mA load, dropout rises to 250mV typical, requiring VIN ≥ 3.05V for full regulation. Input must remain ≥2.5V per absolute ratings, but regulation is not guaranteed below VOUT + VDROP.
Can AP2138R-2.8TRG1 be used with ceramic output capacitors?
Yes - it is explicitly designed for stability with 1µF ceramic capacitors having ESR between 0.01Ω and 100Ω. The datasheet recommends X5R or X7R dielectrics and specifies no minimum ESR requirement, simplifying layout and reducing cost versus tantalum or aluminum electrolytic alternatives.
Does AP2138R-2.8TRG1 include enable or shutdown functionality?
No - AP2138R-2.8TRG1 is a three-pin device (VIN, VOUT, GND) with no enable input. The AP2139 variant adds an active-high CE pin and quick-discharge function, but this part is strictly a fixed-output, always-on LDO regulator.
Is AP2138R-2.8TRG1 suitable for automotive applications?
No - it is not AEC-Q100 qualified. Diodes states that automotive-grade versions require specific change control and PPAP capability, which this part does not possess. For automotive use, consider the MCP1700T-2802E/TT or Diodes' AP7361Q series instead.
AP2138R-2.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP2138R-2.8TRG1 FAQ
1.How can I place an order for AP2138R-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-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 AP2138R-2.8TRG1 reliable?
The price and inventory of AP2138R-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 AP2138R-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-2.8TRG1?
AP2138R-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-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 AP2138R-2.8TRG1?
For technical support, including AP2138R-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-2.8TRG1 requirements.
6.How does Aetrix verify that AP2138R-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-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 AP2138R-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-2.8TRG1?
All AP2138R-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-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 AP2138R-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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