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Diodes Incorporated AP2138R-1.5TRG1
- Part No.:
- AP2138R-1.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-1.5TRG1.pdf
- Description:
- IC REG LINEAR 1.5V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,239
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Product details
Overview
AP2138R-1.5TRG1 from Diodes Incorporated is a fixed-output 1.5V 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 precision power source for battery-powered microcontrollers and sensors in portable electronics.
For engineers reviewing the AP2138R-1.5TRG1 datasheet, AP2138R-1.5TRG1 pinout, AP2138R-1.5TRG1 application, or AP2138R-1.5TRG1 equivalent, key selection criteria include ultra-low IQ for multi-year battery life, tight output tolerance for ADC reference stability, dropout performance at light-to-moderate loads, and SOT-23-3 footprint compatibility with space-constrained PCB layouts.
Technical Context
This LDO employs a CMOS pass transistor with internal voltage reference and error amplifier to regulate output against input variation and load transients. Its architecture achieves 6mV typical line regulation and 25mV typical load regulation across full operating range.
No enable or discharge circuitry is integrated - the AP2138R-1.5TRG1 is a three-terminal, always-on regulator. Thermal protection and short-circuit current limiting (50mA typical) are built-in, with junction temperature rated from –40°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.500 V ±2% - ensures stable supply for 1.5V logic rails and analog sensors requiring tight tolerance |
| Quiescent Current | 1.0 µA typical - enables >10-year battery life in coin-cell–powered IoT endpoints |
| Max Output Current | 250 mA - supports moderate-power MCU cores and peripheral interfaces |
| Dropout Voltage | 100 mV typical at 10mA - allows operation down to VIN = 1.6V while maintaining regulation |
| Load Regulation | 25 mV typical (1–100mA) - minimizes output shift during dynamic current draw |
| Line Regulation | 6 mV typical (2.5–6.0V input) - maintains output stability across wide battery discharge range |
| Temp Coefficient | ±100 ppm/°C - contributes <±1.5mV drift over –40°C to +85°C ambient |
Pinout & Package
SOT-23-3 package: compact 2.9mm × 1.3mm surface-mount outline with exposed pad for thermal dissipation; JEDEC standard footprint compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal bias and output feedback network; must connect to low-impedance system ground plane |
| 2 | VOUT | Regulated 1.5V output; requires ≥1µF ceramic capacitor (ESR 0.01–100Ω) for stability |
| 3 | VIN | Input supply (2.5–6.0V); requires ≥1µF ceramic decoupling capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0 µA typical - reduces standby power loss to sub-nW level in sleep-mode systems |
| High output accuracy | ±2% over temperature and line/load - eliminates need for external trimming in precision sensor supplies |
| Low dropout performance | 100 mV @ 10mA - extends usable battery voltage range by ~300mV vs. legacy LDOs |
| Integrated protection | Short-circuit current limit (50mA) and thermal shutdown - prevents damage during fault conditions without external components |
| RoHS & green compliance | Totally lead-free, halogen- and antimony-free - meets IEC 61249-2-21 and automotive change-control requirements |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 1.5V supply for ultra-low-power analog front-end and SAR ADC. Use Value: 1.0µA IQ enables >7-year battery life; ±2% VOUT ensures <0.5 LSB gain error in 12-bit conversion. |
Use Scenario: Wireless temperature/humidity node in factory automation cabinet. IC Role / Device Role / Timing Role: Stable 1.5V rail for MEMS sensor bias and low-power MCU RTC domain. Use Value: 100mV dropout allows operation until battery reaches 1.6V; ±100ppm/°C TC avoids calibration drift across –25°C to +70°C. |
| Smart Remote Control | Portable Barcode Scanner |
Use Scenario: IR remote with BLE connectivity and button wake-up. IC Role / Device Role / Timing Role: Always-on 1.5V supply for RF SoC deep-sleep mode and wake-up logic. Use Value: Sub-µA quiescent current preserves battery during months of idle time; SOT-23-3 footprint fits <8mm² PCB area. |
Use Scenario: Handheld scanner using laser diode and CMOS imager. IC Role / Device Role / Timing Role: Clean 1.5V source for image sensor analog core and timing generator. Use Value: 25mV load regulation prevents pixel noise during burst capture; ceramic-capacitor compatibility simplifies BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-15SA-7 | Successor device: 1.5V, 300mA, 0.6µA IQ, improved PSRR (60dB @ 1kHz), same SOT-23-3 | Supports higher peak loads and lower noise-sensitive analog circuits | Preferred for new designs requiring longer battery life or better ripple rejection |
| MCP1700T-1502E/TT | 1.5V, 250mA, 1.6µA IQ, ±0.4% initial accuracy, different pinout (VIN-GND-VOUT) | Higher accuracy but higher IQ; requires layout revision due to reversed pin order | Consider only if tighter initial tolerance outweighs quiescent current penalty |
Compared with AP2138R-1.5TRG1, AP7354-15SA-7 delivers 40% lower IQ and superior AC performance in identical footprint, while MCP1700T-1502E/TT trades 0.6µA higher IQ for ±0.4% initial accuracy - making AP7354 the optimal upgrade path for longevity-critical designs.
Availability
AP2138R-1.5TRG1 is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart remote controls, and portable barcode scanners requiring stable component supply with long-lifecycle support.
Supply support for AP2138R-1.5TRG1 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 devices for power management, signal integrity, and connectivity applications.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for energy-harvesting and battery-operated systems where multi-year operational life is mandatory.
FAQ
What is the maximum input voltage rating for AP2138R-1.5TRG1?
The absolute maximum input voltage is 6.6V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.0V continuously risks reliability degradation, especially at high ambient temperatures. Operation above 6.0V should be limited to transient spikes only, with sufficient derating per thermal resistance (θJA = 250°C/W).
Does AP2138R-1.5TRG1 require an external enable signal?
No - AP2138R-1.5TRG1 has no enable pin and operates continuously when VIN is within specification. It is the non-enable variant of the AP2138/2139 family; the AP2139-1.5 version adds CE and quick-discharge functionality in SOT-23-5.
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 transient response but do not affect basic stability. Input also requires ≥1µF ceramic capacitor placed close to VIN and GND pins.
Is AP2138R-1.5TRG1 qualified for automotive use?
AP2138R-1.5TRG1 is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives (e.g., AP7361Q series) manufactured in IATF 16949 facilities with PPAP support. For automotive applications, contact Diodes or Aetrix for qualified replacements meeting AEC-Q100 Grade 2 or 3 requirements.
AP2138R-1.5TRG1 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):
- 1.5V
- 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-1.5TRG1 FAQ
1.How can I place an order for AP2138R-1.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-1.5TRG1 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 AP2138R-1.5TRG1 reliable?
The price and inventory of AP2138R-1.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138R-1.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-1.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-1.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-1.5TRG1?
AP2138R-1.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-1.5TRG1 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 AP2138R-1.5TRG1?
For technical support, including AP2138R-1.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-1.5TRG1 requirements.
6.How does Aetrix verify that AP2138R-1.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-1.5TRG1 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 AP2138R-1.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-1.5TRG1?
All AP2138R-1.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-1.5TRG1, 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 AP2138R-1.5TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-1.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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