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Diodes Incorporated AP2138R-1.2TRG1
- Part No.:
- AP2138R-1.2TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-1.2TRG1.pdf
- Description:
- IC REG LINEAR 1.2V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
AP2138R-1.2TRG1 from Diodes Incorporated is a fixed-output 1.2V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering up to 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 25mV typical dropout at 10mA load. It operates from 2.5V to 6.0V input and targets ultra-low-power battery-powered systems requiring stable, precision biasing.
For engineers reviewing the AP2138R-1.2TRG1 datasheet, AP2138R-1.2TRG1 pinout, AP2138R-1.2TRG1 application, or AP2138R-1.2TRG1 equivalent, key selection criteria include quiescent current budget, dropout headroom at 100mA, load regulation stability under 100mA step changes, and thermal performance in SOT-23-3 at 85°C ambient.
Technical Context
This LDO integrates a precision voltage reference, error amplifier, feedback resistor network, and current-limit protection circuit. Its CMOS pass element enables ultra-low IQ while maintaining tight DC accuracy across temperature and line/load variations.
Designed for single-rail portable power domains, it requires ≥1µF ceramic input/output capacitance with ESR between 0.01Ω and 100Ω. No enable control or discharge function is present-consistent with AP2138 (not AP2139) series architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.200V ±2% - ensures stable core/bias rail for 1.2V logic or analog circuitry without external feedback |
| Quiescent Current | 1.0µA typical - extends battery life in always-on sensor nodes or RTC backup supplies |
| Max Output Current | 250mA - supports moderate-current peripherals like microcontroller cores or small displays |
| Dropout Voltage | 25mV typical at 10mA / 700mV typical at 250mA - enables operation down to VIN = VOUT + dropout, critical for single-cell Li-ion or coin-cell systems |
| Load Regulation | 25mV typical (1–100mA) - maintains voltage stability during dynamic load transients in portable AV systems |
| Line Regulation | 6mV typical (2.5–6.0V input) - rejects input ripple from switching converters or aging batteries |
| Temp Coefficient | ±100ppm/°C - limits output drift to ±1.2mV over –40°C to +85°C, suitable for precision reference applications |
Pinout & Package
SOT-23-3 package: compact 3-pin surface-mount outline with exposed pad option (R suffix), rated θJA = 250°C/W, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for output current and internal bias; must connect to low-impedance ground plane |
| 2 (VOUT) | Regulated output | Delivers stable 1.2V to load; requires ≥1µF ceramic capacitor placed adjacent to pin |
| 3 (VIN) | Input supply | Accepts 2.5–6.0V unregulated input; requires ≥1µF ceramic decoupling capacitor at entry point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - enables >1-year battery life in 10µA average-load IoT sensors |
| Fixed 1.2V output | No external resistors required - reduces BOM count and layout area vs. adjustable LDOs |
| High DC accuracy | ±2% over temperature and line - eliminates need for post-regulation trimming in cost-sensitive consumer devices |
| Low thermal resistance | θJC = 81.9°C/W - allows 250mA operation with <30°C junction rise above case in still air |
| RoHS/Green compliant | Totally lead-free, halogen- and antimony-free - meets global environmental compliance without derating |
Applications
| Portable Medical Sensors | Wearable Biometric Monitors |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 1.2V supply for ADC reference and RF transceiver bias. Use Value: 1.0µA IQ minimizes battery drain during 99% sleep time; ±2% accuracy ensures consistent sensor calibration across temperature. |
Use Scenario: Optical heart-rate sensor in fitness band with photodiode array and analog signal chain. IC Role / Device Role / Timing Role: Precision 1.2V rail for op-amp bias and SAR ADC reference. Use Value: 25mV dropout at 10mA enables operation from partially discharged coin cell; ±100ppm/°C tempco prevents measurement drift. |
| Smart Home Remote Controls | Industrial Wireless Sensor Nodes |
Use Scenario: Sub-GHz remote with BLE coexistence, powered by CR2032 battery. IC Role / Device Role / Timing Role: Standby power regulator for MCU and RF SoC deep-sleep domain. Use Value: 0.1µA standby not applicable (AP2138 lacks CE), but 1.0µA IQ sustains >2-year shelf life with infrequent button presses. |
Use Scenario: LoRaWAN node measuring temperature/humidity, deployed in unventilated enclosures. IC Role / Device Role / Timing Role: Main 1.2V supply for microcontroller and digital sensor interface. Use Value: 250mA rating handles brief radio transmit bursts; θJA = 250°C/W allows thermal design margin up to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-12SAG-7 | Successor device: 1.2V, 300mA, 0.6µA IQ, improved PSRR, same SOT-23-3 footprint | Supports higher peak loads and lower noise-sensitive analog circuits | Preferred for new designs per Diodes' notice; pin-compatible upgrade path |
| MCP1700T-1202E/TT | Microchip part: 1.2V, 250mA, 1.6µA IQ, ±2% accuracy, SOT-23-3 | Higher IQ increases battery load; identical output spec and package | Valid drop-in where AP2138R-1.2TRG1 is unavailable; verify thermal margin at full load |
Compared with AP2138R-1.2TRG1, AP7354-12SAG-7 delivers lower IQ and higher current capability in the same footprint, while MCP1700T-1202E/TT offers second-source availability at the cost of 60% higher quiescent draw-critical for multi-year battery life.
Availability
AP2138R-1.2TRG1 is available at Aetrix Electronics and suitable for portable medical sensors, wearable biometric monitors, smart home remote controls, and industrial wireless sensor nodes requiring stable component supply with long-lifecycle support.
Supply support for AP2138R-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for battery-critical portable electronics where micropower efficiency and output precision outweigh enable functionality.
FAQ
What is the minimum input voltage required for AP2138R-1.2TRG1 to regulate at 1.2V?
The recommended minimum input voltage is 2.5V, per the datasheet's operating conditions. At 250mA load, dropout reaches ~1.0V, so VIN must be ≥2.2V to maintain regulation-but 2.5V ensures margin across temperature, tolerance, and transient response. Below 2.5V, output voltage drops linearly with input.
Can AP2138R-1.2TRG1 be used with ceramic output capacitors smaller than 1µF?
No. The datasheet specifies a minimum 1µF ceramic output capacitor with ESR between 0.01Ω and 100Ω for stability. Using smaller values risks oscillation or poor transient response, especially under 100mA load steps. X5R/X7R 1µF 0603 or 0805 ceramics are validated.
Does AP2138R-1.2TRG1 include reverse-voltage or overtemperature protection?
No. It features only current-limit protection (50mA short-circuit current) and has no integrated thermal shutdown or reverse-battery protection. External TVS diodes and series FETs are required for robust system-level protection in automotive or industrial environments.
Is AP2138R-1.2TRG1 qualified for automotive applications per AEC-Q100?
No. The AP2138/2139 series is not AEC-Q100 qualified. Diodes states that automotive-grade versions require specific change control and IATF 16949 manufacturing-contact their automotive team for qualified alternatives like the AP7361 series.
AP2138R-1.2TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP2138R-1.2TRG1 FAQ
1.How can I place an order for AP2138R-1.2TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-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 AP2138R-1.2TRG1 reliable?
The price and inventory of AP2138R-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 AP2138R-1.2TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-1.2TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-1.2TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-1.2TRG1?
AP2138R-1.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-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 AP2138R-1.2TRG1?
For technical support, including AP2138R-1.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-1.2TRG1 requirements.
6.How does Aetrix verify that AP2138R-1.2TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-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 AP2138R-1.2TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-1.2TRG1?
All AP2138R-1.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-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 AP2138R-1.2TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-1.2TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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