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Diodes Incorporated AP2138N-3.3TRG1
- Part No.:
- AP2138N-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2138N-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 250MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:63,076
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Product details
Overview
AP2138N-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V 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 20mV typical dropout at 10mA load. It serves as a power supply for ultra-low-power microcontrollers and sensors in battery-powered portable devices.
For engineers reviewing the AP2138N-3.3TRG1 datasheet, AP2138N-3.3TRG1 pinout, AP2138N-3.3TRG1 application, or AP2138N-3.3TRG1 equivalent, key selection criteria include its 3.3V fixed output, SOT-23-3 footprint compatibility, 250mA load capability, ultra-low 1µA quiescent current, and absence of enable control-distinguishing it from the AP2139 series.
Technical Context
The AP2138N-3.3TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain stable 3.3V regulation across input voltages from 2.5V to 6.0V. Its CMOS pass element enables low dropout and minimal quiescent current without requiring external biasing.
No enable pin or quick-discharge circuitry is present-this is a three-terminal regulator with VIN, VOUT, and GND only. Thermal protection and short-circuit current limiting (50mA typical) are built-in, and stability requires ≥1µF ceramic output capacitance with ESR between 0.01Ω and 100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% (3.234V–3.366V), enabling reliable powering of 3.3V logic and RF ICs |
| Quiescent Current | 1.0µA typical at zero load, minimizing battery drain in always-on sensor nodes |
| Max Output Current | 250mA continuous, sufficient for MCU + peripheral subsystems in compact portable designs |
| Dropout Voltage | 20mV typical at 10mA; 400mV typical at 250mA-supports operation down to VIN = 3.7V at full load |
| Line Regulation | 6mV typical over 4.3V–6.0V input range, ensuring stable output despite battery voltage sag |
| Load Regulation | 25mV typical from 1mA to 100mA, maintaining tight voltage under dynamic load changes |
| Temp Coefficient | ±100ppm/°C output drift, contributing <±0.28% variation over –40°C to +85°C ambient |
Pinout & Package
SOT-23-3 package: small-outline transistor outline with 0.95mm pitch, thermally enhanced for surface-mount PCB assembly; JEDEC MS-012 compliant, RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.5V–6.0V DC; requires ≥1µF ceramic input capacitor for stability |
| 2 (VOUT) | Regulated output | Delivers fixed 3.3V ±2%; requires ≥1µF ceramic output capacitor with 0.01–100Ω ESR |
| 3 (GND) | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical enables >1-year battery life in 10µA average-load IoT endpoints |
| High output accuracy | ±2% tolerance ensures compatibility with 3.3V I/O interfaces without margining overhead |
| Low thermal resistance | θJA = 250°C/W (SOT-23-3) allows 250mA operation up to +85°C ambient with minimal derating |
| Integrated protection | Short-circuit current limit (50mA) and thermal shutdown prevent damage during fault conditions |
| Stable with ceramic caps | Compatible with low-ESR 1µF+ X5R/X7R ceramics-no tantalum or electrolytic required |
Applications
| Wearable Health Monitor | Wireless Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing powered by coin-cell or Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Primary 3.3V power rail for analog front-end, ADC, and BLE SoC. Use Value: 1.0µA quiescent current extends battery life beyond 2 years; ±2% output ensures ADC reference stability. |
Use Scenario: Battery-operated environmental sensor transmitting temperature/humidity via LoRaWAN. IC Role / Device Role / Timing Role: Regulator for ultra-low-power MCU and RF transceiver during sleep and burst transmit cycles. Use Value: 20mV dropout at light load preserves usable battery voltage down to 3.32V; SOT-23-3 footprint saves board space. |
| Industrial Handheld Scanner | Smart Meter Auxiliary Rail |
Use Scenario: Ruggedized barcode scanner using AA batteries and operating intermittently for 5+ years. IC Role / Device Role / Timing Role: Supplies 3.3V to image sensor, laser driver, and decode processor during active scan. Use Value: 250mA peak current supports simultaneous sensor + processing load; ±100ppm/°C tempco maintains accuracy across field temperature range. |
Use Scenario: Secondary 3.3V rail in utility meter for real-time clock, secure element, and communication interface. IC Role / Device Role / Timing Role: Low-noise, long-life regulator isolated from noisy main 5V supply. Use Value: 6mV line regulation rejects ripple from switching converter; RoHS/Green compliance meets global utility procurement requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-33SG-7 | Successor device: same 3.3V output, 300mA rating, 0.6µA IQ, SOT-23-3 package | Supports wider input range (1.7V–6.0V); includes thermal foldback and tighter ±1% accuracy | Select for new designs requiring extended battery life and improved accuracy-pin-compatible drop-in replacement. |
| MCP1700-3302E/TO | Microchip 3.3V LDO: 250mA, 1.6µA IQ, TO-92 package (through-hole), no SOT-23-3 option | Larger footprint; higher quiescent current reduces battery runtime in space-constrained designs | Consider only for legacy through-hole assembly or where SOT-23-3 rework is not feasible. |
Compared with AP2138N-3.3TRG1, AP7354-33SG-7 offers lower quiescent current and better accuracy in identical packaging, while MCP1700-3302E/TO trades surface-mount compatibility for through-hole manufacturability and higher IQ-making AP2138N-3.3TRG1 optimal for cost-sensitive, space-constrained legacy designs still in production.
Availability
AP2138N-3.3TRG1 is available at Aetrix Electronics and suitable for battery-powered equipment, portable AV systems, mobile phones, and communication tools requiring stable component supply and long-term sourcing continuity.
Supply support for AP2138N-3.3TRG1 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 manufacturer specializing in discrete, analog, and mixed-signal solutions 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 wireless devices where battery longevity and small form factor are critical.
FAQ
Is AP2138N-3.3TRG1 pin-compatible with other SOT-23-3 LDOs?
Yes-it uses standard SOT-23-3 pinout (VIN-VOUT-GND) and matches footprint and thermal pad layout of industry-standard 3-pin LDOs like MCP1700 and TPS709. However, electrical behavior-including quiescent current, dropout, and stability requirements-must be verified per design.
Does AP2138N-3.3TRG1 require an enable signal?
No. AP2138N-3.3TRG1 has no enable pin and operates continuously when VIN is within 2.5V–6.0V. For on/off control, external MOSFET switching on the input rail is required. The AP2139 variant adds CE functionality.
What output capacitor is recommended for stability?
A minimum 1µF X5R or X7R ceramic capacitor with ESR between 0.01Ω and 100Ω is required at VOUT. Diodes recommends 2.2µF for margin; tantalum or aluminum electrolytics are not recommended due to ESR and aging effects.
Is AP2138N-3.3TRG1 suitable for automotive applications?
No. AP2138N-3.3TRG1 is not AEC-Q100 qualified. Diodes offers automotive-grade alternatives such as AP7361Q (AEC-Q100 Grade 1) for under-hood or infotainment use; consult Diodes' automotive product definitions for PPAP-capable options.
AP2138N-3.3TRG1 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2138N-3.3TRG1 FAQ
1.How can I place an order for AP2138N-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138N-3.3TRG1 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-3.3TRG1 reliable?
The price and inventory of AP2138N-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138N-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138N-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138N-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138N-3.3TRG1?
AP2138N-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138N-3.3TRG1 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-3.3TRG1?
For technical support, including AP2138N-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138N-3.3TRG1 requirements.
6.How does Aetrix verify that AP2138N-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138N-3.3TRG1 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-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138N-3.3TRG1?
All AP2138N-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138N-3.3TRG1, 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-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2138N-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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