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Diodes Incorporated AP2138R-4.0TRG1
- Part No.:
- AP2138R-4.0TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-4.0TRG1.pdf
- Description:
- IC REG LINEAR 4V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
AP2138R-4.0TRG1 from Diodes Incorporated is a fixed-output 4.0V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering 250mA output current with ±2% output voltage accuracy, ultra-low 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 AP2138R-4.0TRG1 datasheet, AP2138R-4.0TRG1 pinout, AP2138R-4.0TRG1 application, or AP2138R-4.0TRG1 equivalent, key selection criteria include quiescent current under light load, dropout behavior at 250mA, thermal resistance (θJA = 250°C/W), and compatibility with 1µF ceramic input/output capacitors for stability.
Technical Context
This LDO employs a CMOS pass transistor with internal voltage reference and error amplifier to regulate output against line/load/temperature variations. It operates across 2.5V–6.0V input range and maintains ±2% output accuracy over -40°C to +85°C ambient temperature.
No enable or discharge circuitry is integrated-the AP2138R variant lacks CE pin functionality present in AP2139 series. Its SOT-23-3 pinout maps VIN, VOUT, and GND directly without logic control terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0V ±2% (3.92V–4.08V), enabling direct replacement of 4.0V logic rails without external feedback. |
| Quiescent Current | 1.0µA typical at zero load-minimizes battery drain in always-on standby modes of portable devices. |
| Max Output Current | 250mA continuous-supports moderate-power microcontrollers, sensors, and audio codecs. |
| Dropout Voltage | 20mV typical at 10mA; 400mV typical at 250mA-allows operation from single-cell Li-ion (3.0V min) with margin. |
| Load Regulation | 25mV typical (1mA–100mA)-ensures stable voltage during dynamic current steps in digital subsystems. |
| Line Regulation | 6mV typical (2.5V–6.0V input range)-rejects ripple and sag from switching supply inputs. |
| Temp Coefficient | ±100ppm/°C-limits output drift to ±0.34% over -40°C to +85°C junction range. |
Pinout & Package
SOT-23-3 package with exposed pad (R suffix), footprint-compatible with JEDEC TO-236AB standard; thermal resistance θJA = 250°C/W enables 250mA operation with minimal heatsinking in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.5V–6.0V unregulated input; requires ≥1µF ceramic capacitor placed adjacent to pin. |
| 2 (VOUT) | Regulated output | Delivers stable 4.0V ±2%; requires ≥1µF ceramic output capacitor with ESR 0.01Ω–100Ω for loop stability. |
| 3 (GND) | Ground reference | Common return path for input/output currents; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical enables >1-year battery life in coin-cell-powered IoT sensors at 10µA average system load. |
| High output accuracy | ±2% tolerance ensures reliable operation of 3.3V/4.0V I/O interfaces without external trimming or calibration. |
| Low dropout performance | 20mV @ 10mA allows regulation from near-dead batteries (e.g., 3.8V Li-ion at end-of-discharge). |
| Thermal protection | Internal thermal shutdown activates at TJ ≥ +150°C-prevents damage during sustained overload or poor PCB layout. |
| RoHS/Green compliance | Fully lead-free, halogen- and antimony-free per Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb). |
Applications
| Portable AV Systems | Mobile Phones |
|---|---|
Use Scenario: Powering camera modules and display drivers in handheld video recorders. IC Role / Device Role / Timing Role: Primary 4.0V bias supply for image sensor analog front-end and LCD backlight ICs. Use Value: Ultra-low IQ extends recording time on single 3.7V Li-ion cell; ±2% accuracy prevents sensor gain drift. |
Use Scenario: Supplying 4.0V rail to RF transceiver power amplifiers and baseband processors. IC Role / Device Role / Timing Role: Secondary LDO for noise-sensitive RF section, decoupled from noisy DC-DC converters. Use Value: 25mV load regulation minimizes VOUT sag during TX burst events; 250mA headroom supports peak PA current. |
| Battery-Powered Equipment | Reference Voltage Sources |
Use Scenario: Long-life remote sensors powered by AA/AAA alkaline cells. IC Role / Device Role / Timing Role: Main system regulator converting 3.0V–4.5V battery stack to stable 4.0V for MCU and ADC. Use Value: 1.0µA IQ reduces self-discharge to <0.1% per month; 6.0V max VIN accommodates fresh alkaline stack. |
Use Scenario: Precision analog signal chains requiring stable reference voltage generation. IC Role / Device Role / Timing Role: Low-noise 4.0V source for DAC reference buffers and instrumentation amplifier biasing. Use Value: ±100ppm/°C tempco limits reference drift to ±0.34% over industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-40W5-7 | Successor device: 4.0V output, 300mA rating, 0.6µA IQ, improved PSRR (60dB @ 1kHz), SOT-23-5 package with enable pin. | Requires board redesign due to 5-pin layout and added CE functionality; not drop-in compatible. | Select when new designs require lower IQ, higher current, or active enable control-AP2138R-4.0TRG1 remains valid for legacy SOT-23-3 footprint constraints. |
| MCP1700T-4002E/TT | Microchip 4.0V LDO: 250mA, 1.6µA IQ, ±2% accuracy, SOT-23-3 package, but higher 175mV dropout at 250mA. | Compatible pinout and footprint; suitable where slightly higher dropout is acceptable for cost-sensitive BOMs. | Prefer for cost-driven consumer designs where 175mV vs. 400mV dropout at full load is acceptable and RoHS-3 compliance is verified. |
Compared with AP7354-40W5-7, AP2138R-4.0TRG1 offers proven reliability in existing SOT-23-3 layouts but lacks enable control and has higher IQ; versus MCP1700T-4002E/TT, it delivers lower dropout at high load and tighter thermal specs (θJA = 250°C/W vs. 290°C/W), favoring thermally constrained PCBs.
Availability
AP2138R-4.0TRG1 is available at Aetrix Electronics and suitable for portable AV systems, battery-powered equipment, and mobile phone power management requiring stable component supply with long-term lifecycle visibility.
Supply support for AP2138R-4.0TRG1 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 industrial, computing, and consumer markets.
The AP2138 series belongs to Diodes' ultra-low-IQ LDO product line, engineered specifically for extended battery life in space-constrained portable electronics where standby current and dropout voltage are critical.
FAQ
What is the maximum input voltage for AP2138R-4.0TRG1?
The absolute maximum input voltage is 6.6V, but recommended operating range is 2.5V to 6.0V. Exceeding 6.0V risks exceeding safe power dissipation limits, especially at high ambient temperatures or full 250mA load, due to its 250°C/W θJA thermal resistance.
Can AP2138R-4.0TRG1 be used with ceramic output capacitors?
Yes-ceramic capacitors are explicitly recommended. The device requires ≥1µF output capacitance with ESR between 0.01Ω and 100Ω for stability; X5R/X7R 1µF 0603 ceramics meet this requirement and are widely used in production designs.
Does AP2138R-4.0TRG1 include current limiting or thermal shutdown?
Yes-it integrates both current limit protection (50mA short-circuit current) and thermal shutdown that activates at junction temperature ≥+150°C. These features prevent catastrophic failure during output shorts or inadequate PCB copper area.
Is AP2138R-4.0TRG1 qualified for automotive applications?
No-this part is not AEC-Q100 qualified. Diodes states that automotive-grade versions require specific change control, PPAP capability, and IATF 16949 manufacturing; users needing automotive qualification must contact Diodes directly for approved alternatives.
AP2138R-4.0TRG1 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):
- 4V
- 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
AP2138R-4.0TRG1 FAQ
1.How can I place an order for AP2138R-4.0TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-4.0TRG1 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-4.0TRG1 reliable?
The price and inventory of AP2138R-4.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138R-4.0TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-4.0TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-4.0TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-4.0TRG1?
AP2138R-4.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-4.0TRG1 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-4.0TRG1?
For technical support, including AP2138R-4.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-4.0TRG1 requirements.
6.How does Aetrix verify that AP2138R-4.0TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-4.0TRG1 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-4.0TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-4.0TRG1?
All AP2138R-4.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-4.0TRG1, 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-4.0TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-4.0TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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