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Diodes Incorporated AP2138RA-3.3TRG1
- Part No.:
- AP2138RA-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138RA-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
AP2138RA-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V CMOS low-dropout (LDO) voltage regulator in SOT-89 (RA) package, delivering up to 250mA output current with ±2% output voltage accuracy, 1.0µA typical quiescent current, and 20mV typical dropout at 10mA load-designed for battery-powered portable AV systems and mobile phone power rails.
For engineers reviewing the AP2138RA-3.3TRG1 datasheet, AP2138RA-3.3TRG1 pinout, AP2138RA-3.3TRG1 application, or AP2138RA-3.3TRG1 equivalent, key selection criteria include ultra-low IQ for extended battery life, tight output tolerance under varying load/temperature, and SOT-89 thermal performance in space-constrained handheld designs.
Technical Context
The AP2138RA-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 compensation.
It operates over –40°C to +85°C ambient temperature with ±100ppm/°C output voltage temperature coefficient and supports ceramic output capacitors ≥1µF (ESR 0.01–100Ω). No enable or discharge circuitry is present-distinguishing it from the AP2139 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% (3.234–3.366V), ensuring reliable logic-level supply for 3.3V microcontrollers and sensors |
| Quiescent Current | 1.0µA typical (IOUT = 0), enabling multi-year battery operation in always-on IoT nodes |
| Dropout Voltage | 20mV typical at IOUT = 10mA, allowing regulation from 3.32V input-critical for single-cell Li-ion or Li-poly backup rails |
| Output Current | 250mA maximum, sufficient for powering baseband processors, camera modules, or RF front-ends |
| Line Regulation | 6mV typical (2.5V ≤ VIN ≤ 6.0V), minimizing output drift during battery discharge or input ripple |
| Load Regulation | 25mV typical (1mA ≤ IOUT ≤ 100mA), maintaining stable voltage across dynamic load steps in portable audio codecs |
| Temp. Coefficient | ±100ppm/°C, limiting output drift to ±0.028V over –40°C to +85°C junction range |
Pinout & Package
SOT-89 (RA) package: 3-pin thermally enhanced plastic surface-mount package with exposed tab for improved heat dissipation (θJA = 165°C/W, θJC = 51.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input voltage terminal (2.5–6.0V); requires ≥1µF ceramic input capacitor for stability |
| 2 | VOUT | Regulated 3.3V output; requires ≥1µF ceramic output capacitor (ESR 0.01–100Ω) |
| 3 | GND | Power ground reference; must be low-impedance connection to minimize noise and dropout error |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical enables >10-year shelf life in coin-cell–powered medical sensors |
| High output accuracy | ±2% tolerance ensures compatibility with 3.3V I/O standards without margining overhead |
| Low dropout performance | 20mV @ 10mA allows direct regulation from partially discharged 3.6V Li-ion cells |
| Thermal robustness | SOT-89 RA package delivers 165°C/W θJA, supporting 250mA continuous output at +70°C ambient |
| Stability with ceramic caps | Guaranteed stable with ≥1µF X5R/X7R ceramics (0.01–100Ω ESR), eliminating tantalum cost and reliability risk |
Applications
| Portable Audio Systems | Mobile Phone Baseband Power |
|---|---|
|
Use Scenario: Powering DACs, headphone amplifiers, and audio codecs in Bluetooth speakers and wireless earbuds. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying analog and digital audio subsystems with low-noise, stable voltage. Use Value: 1.0µA quiescent current extends playback time; ±2% accuracy prevents clipping or distortion in 16-bit audio paths. |
Use Scenario: Regulating 3.3V rail for baseband processors and PMIC interfaces in GSM/UMTS smartphones. IC Role / Device Role / Timing Role: Secondary LDO delivering clean, low-ripple supply independent of main PMIC switching noise. Use Value: 20mV dropout preserves headroom during RF transmit bursts; 25mV load regulation avoids brownouts during CPU wake events. |
| Camera Module Power | IoT Sensor Node Supply |
|
Use Scenario: Providing bias voltage to CMOS image sensors and ISP power domains in compact action cameras. IC Role / Device Role / Timing Role: Dedicated LDO for sensor analog core and interface logic, isolated from noisy digital supplies. Use Value: ±100ppm/°C tempco maintains ADC reference stability across outdoor operating temperatures; ceramic cap compatibility reduces BOM count. |
Use Scenario: Supplying ultra-low-power MCUs (e.g., ARM Cortex-M0+) and environmental sensors in battery-operated smart meters. IC Role / Device Role / Timing Role: Always-on LDO maintaining real-time clock and wake-up circuitry during deep-sleep modes. Use Value: 1.0µA IQ enables >5-year battery life on CR2032; 6mV line regulation rejects battery voltage sag during cold starts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-33SA-7 | Successor device: 300mA output, 0.6µA IQ, 120mV dropout @ 250mA, SOT-23-5 package | Includes enable pin and quick-discharge; supports active sequencing and lower standby power | Select for new designs requiring higher current, lower IQ, or system-level control-AP2138RA-3.3TRG1 remains valid for legacy drop-in replacement where enable is unused |
| MCP1700-3302E/TO | Microchip part: 250mA, 1.6µA IQ, 178mV dropout @ 250mA, TO-92 package | Through-hole mounting; higher thermal resistance (θJA = 200°C/W) limits high-current use in compact PCBs | Choose only for through-hole prototyping or low-volume industrial controls where SOT-89 reflow is unavailable |
Compared with AP7354-33SA-7, AP2138RA-3.3TRG1 offers proven SOT-89 thermal performance but lacks enable control; versus MCP1700-3302E/TO, it provides superior power density and thermal efficiency in surface-mount production.
Availability
AP2138RA-3.3TRG1 is available at Aetrix Electronics and suitable for portable audio systems, mobile phone baseband power, camera module supply, and IoT sensor node designs requiring stable component supply with long-term manufacturability.
Supply support for AP2138RA-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 manufacturer of discrete semiconductors and analog ICs, specializing in 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 battery-critical portable electronics where runtime, thermal footprint, and supply stability are primary design constraints.
FAQ
What is the maximum input voltage rating for AP2138RA-3.3TRG1?
The absolute maximum input voltage is 6.6V, but recommended operating range is 2.5V to 6.0V. Exceeding 6.0V risks accelerated degradation; operation above 6.6V causes permanent damage per DS37428 Rev. 6–3 Section 4 Absolute Maximum Ratings.
Does AP2138RA-3.3TRG1 require an external enable signal?
No. AP2138RA-3.3TRG1 has no enable pin-it operates continuously when VIN is within specification. The AP2139 variant includes CE functionality; this part is the non-enable version in SOT-89 (RA) package per Pin Description Table on page 3 of DS37428.
Can AP2138RA-3.3TRG1 be used with ceramic output capacitors?
Yes. The datasheet explicitly specifies stability with ≥1µF ceramic capacitors having ESR between 0.01Ω and 100Ω (page 3, Typical Applications Circuit Note 4). X5R and X7R dielectrics are recommended; no series resistor is needed.
Is AP2138RA-3.3TRG1 qualified for automotive applications?
No. Diodes states that AP2138/2139 "is not recommended for new designs" and directs automotive users to contact them for AEC-Q100–qualified alternatives. This part lacks PPAP capability, IATF 16949 manufacturing evidence, or automotive-grade qualification per footnote on page 1 of DS37428.
AP2138RA-3.3TRG1 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):
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP2138RA-3.3TRG1 FAQ
1.How can I place an order for AP2138RA-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138RA-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 AP2138RA-3.3TRG1 reliable?
The price and inventory of AP2138RA-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 AP2138RA-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138RA-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138RA-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138RA-3.3TRG1?
AP2138RA-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138RA-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 AP2138RA-3.3TRG1?
For technical support, including AP2138RA-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138RA-3.3TRG1 requirements.
6.How does Aetrix verify that AP2138RA-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138RA-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 AP2138RA-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138RA-3.3TRG1?
All AP2138RA-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138RA-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 AP2138RA-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2138RA-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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