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Diodes Incorporated AP2138N-1.2TRG1
- Part No.:
- AP2138N-1.2TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-1.2TRG1.pdf
- Description:
- IC REG LINEAR 1.2V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
AP2138N-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 100mV typical dropout at 10mA load. It serves as a primary power rail for ultra-low-power microcontrollers and sensors in battery-constrained portable systems.
For engineers reviewing the AP2138N-1.2TRG1 datasheet, AP2138N-1.2TRG1 pinout, AP2138N-1.2TRG1 application, or AP2138N-1.2TRG1 equivalent, key selection criteria include its 1.2V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, and guaranteed stability with ≥1µF ceramic output capacitance.
Technical Context
This LDO integrates a precision voltage reference, error amplifier, and resistor network for fixed 1.2V regulation. Its CMOS pass element enables ultra-low quiescent current (1.0µA typ) without compromising transient response or line/load regulation performance.
No enable or discharge functionality is present-this is the AP2138 variant, not the AP2139. The device operates across -40°C to +85°C ambient temperature with input voltage range 2.5V–6.0V and requires ≥1µF ceramic input/output capacitors for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.200V ±2% - ensures stable core supply for 1.2V logic domains and low-voltage MCUs |
| Quiescent Current | 1.0µA typical - extends battery life in always-on sensor nodes and wearables |
| Max Output Current | 250mA - supports moderate-power peripherals like BLE radios or display drivers |
| Dropout Voltage | 100mV typical at 10mA - enables operation down to VIN = 1.3V while maintaining regulation |
| Load Regulation | 25mV typical (1–100mA) - maintains tight output voltage under dynamic load steps |
| Line Regulation | 6mV typical (2.5–6.0V VIN) - rejects input ripple from aging batteries or noisy DC-DC stages |
| Temp Coefficient | ±100ppm/°C - limits output drift to ±1.2mV over full operating temperature range |
Pinout & Package
SOT-23-3 package: compact 2.9mm × 1.6mm surface-mount outline with gull-wing leads, rated for θJA = 250°C/W and TJ(max) = +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power ground reference for internal error amplifier and voltage reference |
| 2 | VOUT | Regulated 1.2V output node; requires ≥1µF ceramic capacitor for loop stability |
| 3 | VIN | Input supply (2.5–6.0V); must be filtered with ≥1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.0µA typical enables >10-year battery life in 10µA average-load IoT endpoints |
| High accuracy | ±2% output tolerance ensures reliable operation of 1.2V-core processors without margin overhead |
| Low thermal resistance | θJC = 81.9°C/W allows 250mA delivery with minimal die heating in confined PCB areas |
| Stable with ceramic caps | Guaranteed stability with 1µF ceramic output capacitor (ESR 0.01–100Ω) simplifies BOM and layout |
| Robust protection | Internal current limiting (50mA short-circuit) and thermal shutdown prevent damage during fault conditions |
Applications
| Wearable Health Sensors | Industrial Wireless Nodes |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring in coin-cell-powered wristbands. IC Role / Device Role / Timing Role: Primary 1.2V supply for ultra-low-power MCU and analog front-end. Use Value: 1.0µA quiescent current extends CR2032 battery life beyond 2 years at 10-second sampling intervals. | Use Scenario: Battery-operated vibration sensor node deployed in remote factory equipment. IC Role / Device Role / Timing Role: Stable 1.2V rail for MEMS accelerometer and sub-GHz RF transceiver. Use Value: ±2% output accuracy prevents ADC reference drift and maintains RF calibration integrity over temperature. |
| Smart Meter Subsystems | Portable Diagnostic Tools |
Use Scenario: Real-time clock and metrology ASIC power in lithium-thionyl-chloride powered utility meters. IC Role / Device Role / Timing Role: Always-on 1.2V supply enabling 10-year shelf life and cold-temperature startup. Use Value: Operation down to -40°C with <100mV dropout ensures RTC functionality even as battery voltage declines. | Use Scenario: Handheld medical ultrasound probe requiring low-noise analog supply. IC Role / Device Role / Timing Role: Clean 1.2V bias for high-resolution ADC and low-jitter clock generator. Use Value: 6mV line regulation suppresses switching noise from shared DC-DC converter, preserving SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-12SAG-7 | Successor device: 1.2V, 300mA, 0.6µA IQ, SOT-23-3, AEC-Q100 qualified | Supports automotive-grade reliability requirements and higher output current | Select for new designs requiring extended lifecycle support or automotive qualification |
| MCP1700T-1202E/TT | 1.2V, 250mA, 1.6µA IQ, SOT-23-3, ±0.4% initial accuracy | Higher initial accuracy but higher quiescent current; no Diodes' thermal robustness data | Prefer when tighter initial tolerance outweighs ultra-low IQ requirement |
Compared with AP2138N-1.2TRG1, AP7354-12SAG-7 offers lower IQ and automotive qualification but requires revalidation of stability with same capacitor; MCP1700T-1202E/TT trades 0.6µA higher IQ for ±0.4% accuracy, better suited for precision analog rails than battery runtime optimization.
Availability
AP2138N-1.2TRG1 is available at Aetrix Electronics and suitable for wearable health sensors, industrial wireless nodes, smart meter subsystems, and portable diagnostic tools requiring stable component supply with long-term traceability.
Supply support for AP2138N-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, designed specifically for energy-constrained portable and battery-powered systems where runtime and standby efficiency are critical.
FAQ
Is AP2138N-1.2TRG1 pin-compatible with other SOT-23-3 LDOs?
Yes-it uses standard SOT-23-3 pinout (VIN-VOUT-GND), matching industry layout conventions. However, electrical behavior differs: its 1.0µA IQ and ±2% accuracy require verification against target system's load transient and tolerance requirements before drop-in replacement.
What output capacitor is required for stability?
A minimum 1µF ceramic capacitor with ESR between 0.01Ω and 100Ω is required at VOUT. X5R or X7R dielectrics are recommended. Larger values improve PSRR and load transient response but are not mandatory for basic stability.
Does AP2138N-1.2TRG1 include enable or shutdown functionality?
No. AP2138N-1.2TRG1 is the non-enable variant. It lacks CE pin and quick-discharge circuitry-power control must be implemented externally via VIN switching. For enable functionality, use AP2139-1.2 variants in SOT-23-5.
Why is AP2138/2139 "not recommended for new designs"?
Diodes recommends AP7354 as the functional successor due to improved IQ (0.6µA), higher output current (300mA), and AEC-Q100 qualification. AP2138N-1.2TRG1 remains available for legacy support and cost-sensitive applications where its specifications meet design needs.
AP2138N-1.2TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 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-23-3
AP2138N-1.2TRG1 FAQ
1.How can I place an order for AP2138N-1.2TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-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 AP2138N-1.2TRG1 reliable?
The price and inventory of AP2138N-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 AP2138N-1.2TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-1.2TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-1.2TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-1.2TRG1?
AP2138N-1.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-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 AP2138N-1.2TRG1?
For technical support, including AP2138N-1.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-1.2TRG1 requirements.
6.How does Aetrix verify that AP2138N-1.2TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-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 AP2138N-1.2TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-1.2TRG1?
All AP2138N-1.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-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 AP2138N-1.2TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-1.2TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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