My Inquiry
My Account
Diodes Incorporated AP2138R-2.5TRG1
- Part No.:
- AP2138R-2.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-2.5TRG1.pdf
- Description:
- IC REG LINEAR 2.5V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2138R-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5V CMOS low-dropout (LDO) voltage regulator in SOT-23-3 package, delivering up to 250mA output current with ±2% output voltage accuracy, ultra-low 1.0µA typical quiescent current, and 25mV typical dropout at 10mA load. It serves as a precision power source for battery-powered microcontrollers and sensor interfaces requiring stable low-power biasing.
For engineers reviewing the AP2138R-2.5TRG1 datasheet, AP2138R-2.5TRG1 pinout, AP2138R-2.5TRG1 application, or AP2138R-2.5TRG1 equivalent, key selection criteria include its 250mA output capability, 2.5V ±2% regulation tolerance, SOT-23-3 thermal resistance of 81.9°C/W, and compatibility with 1µF ceramic input/output capacitors for portable AV systems and mobile phone subsystems.
Technical Context
The AP2138R-2.5TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain regulated 2.5V output across input voltages from 3.5V to 6.0V. Its CMOS architecture enables ultra-low quiescent current without compromising transient response or line/load regulation.
It operates over -40°C to +85°C ambient temperature with ±100ppm/°C output voltage temperature coefficient and supports stable operation with 1µF ceramic capacitors having ESR between 0.01Ω and 100Ω-no external enable or discharge circuitry required due to its AP2138-series non-enable configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2% - ensures stable MCU core or analog sensor bias within tight tolerance across temperature and load |
| Quiescent Current | 1.0µA typical - extends battery life in always-on wearable or IoT edge nodes |
| Max Output Current | 250mA - powers small microcontrollers, RF transceivers, or display drivers without external pass devices |
| Dropout Voltage | 25mV typical at 10mA - enables operation from single-cell Li-ion (3.0–3.6V) with minimal headroom loss |
| Line Regulation | 6mV typical - maintains output stability despite battery voltage sag during high-current pulses |
| Load Regulation | 25mV typical (1–100mA) - prevents digital noise coupling into analog signal chains under dynamic load changes |
| Thermal Resistance θJA | 250°C/W (SOT-23-3) - limits junction rise to <10°C above ambient at 100mA in still air, enabling compact PCB layout |
Pinout & Package
SOT-23-3 package with exposed pad not electrically connected; footprint compatible with JEDEC TO-236AB standard; thermal performance optimized for PCB copper pour on GND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 3.5V–6.0V DC input; requires ≥1µF ceramic decoupling capacitor placed adjacent to pin |
| 2 (VOUT) | Regulated output | Delivers stable 2.5V ±2%; must connect ≥1µF ceramic capacitor with ESR 0.01–100Ω for loop stability |
| 3 (GND) | Ground reference | Primary return path for input/output currents; connects to low-impedance system ground plane to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical - reduces standby power loss by >90% versus standard LDOs, critical for coin-cell applications |
| High output accuracy | ±2% over -40°C to +85°C - eliminates need for post-regulation trimming in precision analog front-ends |
| Low dropout voltage | 25mV at 10mA - enables efficient use of aging batteries down to 2.55V input while maintaining 2.5V output |
| Stable with ceramic capacitors | 1µF minimum COUT, 0.01–100Ω ESR - simplifies BOM and layout by avoiding tantalum or electrolytic alternatives |
| RoHS-compliant & green | Lead-free, halogen-free, antimony-free - meets IEC 61249-2-21 and automotive change-control requirements |
Applications
| Wearable Health Monitor | Bluetooth LE Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary 2.5V bias rail for ultra-low-power ADC, op-amp buffer, and BLE SoC I/O domain. Use Value: 1.0µA quiescent current minimizes battery drain during sleep cycles; ±2% output ensures consistent ADC reference scaling across temperature. |
Use Scenario: Battery-powered environmental sensor transmitting temperature/humidity via Bluetooth Low Energy every 5 seconds. IC Role / Device Role / Timing Role: Stable 2.5V supply for MEMS sensor interface and BLE radio VDD_IO rail. Use Value: 25mV dropout allows operation until battery reaches 2.55V; 250mA peak capacity supports radio transmit bursts without brownout. |
| Industrial Handheld Scanner | Smart Camera Module |
|
Use Scenario: Ruggedized barcode scanner using Li-ion pack with intermittent high-current laser and imager activation. IC Role / Device Role / Timing Role: Dedicated 2.5V rail for image sensor analog front-end and FPGA configuration memory. Use Value: 6mV line regulation prevents image noise during battery voltage sag; 250mA output sustains simultaneous laser driver and sensor bias. |
Use Scenario: Compact USB camera module embedded in video conferencing hardware with strict EMI constraints. IC Role / Device Role / Timing Role: Clean 2.5V supply for CIS image sensor analog core and PLL clock generation circuitry. Use Value: Ceramic-capacitor stability eliminates switching noise coupling into pixel readout; ±100ppm/°C tempco ensures color fidelity across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-25SA-7 | 2.5V, 300mA, 0.6µA IQ, SOT-23-3, AEC-Q100 qualified | Automotive-grade replacement with lower quiescent current and extended temperature range (−40°C to +125°C) | Select when automotive qualification, higher current headroom, or extended temperature operation is required |
| MCP1700T-2502E/TT | 2.5V, 250mA, 1.6µA IQ, SOT-23-3, ±2% accuracy, 175mV dropout @100mA | Higher dropout and quiescent current; Microchip industrial-grade alternative with identical pinout | Select if Diodes supply continuity is constrained and legacy design validation with Microchip is already established |
Compared with AP2138R-2.5TRG1, AP7354-25SA-7 offers lower IQ and automotive qualification but requires revalidation for AEC-Q100; MCP1700T-2502E/TT matches pinout and output specs but trades 0.6µA higher IQ and 150mV higher dropout at full load-making it suitable only where Diodes sourcing is unavailable.
Availability
AP2138R-2.5TRG1 is available at Aetrix Electronics and suitable for battery-powered equipment, portable AV systems, and mobile phone subsystems requiring stable component supply with long-term lifecycle support.
Supply support for AP2138R-2.5TRG1 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 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-operated systems where standby efficiency and output precision are critical.
FAQ
What is the maximum input voltage for AP2138R-2.5TRG1?
The absolute maximum input voltage is 6.6V, but the recommended operating range is 3.5V to 6.0V per electrical characteristics testing conditions. Operation above 6.0V risks exceeding safe power dissipation limits in SOT-23-3 packaging, especially at elevated ambient temperatures.
Does AP2138R-2.5TRG1 require an enable signal?
No. AP2138R-2.5TRG1 is part of the AP2138 series, which lacks an enable pin-unlike the AP2139 series. It operates continuously when valid input voltage is applied; shutdown requires removing VIN or inserting a series switch upstream.
Can AP2138R-2.5TRG1 be used with ceramic output capacitors?
Yes. The device is explicitly characterized for stability with 1µF ceramic capacitors having ESR between 0.01Ω and 100Ω. No series resistor or additional compensation is needed, simplifying filtering and reducing board area versus tantalum-based solutions.
Is AP2138R-2.5TRG1 recommended for new designs?
No. Diodes Incorporated states "AP2138/2139 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7354." This notice appears in the official datasheet; AP7354 offers improved IQ, thermal performance, and automotive qualification while maintaining SOT-23-3 compatibility.
AP2138R-2.5TRG1 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 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-2.5TRG1 FAQ
1.How can I place an order for AP2138R-2.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-2.5TRG1 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-2.5TRG1 reliable?
The price and inventory of AP2138R-2.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2138R-2.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-2.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-2.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-2.5TRG1?
AP2138R-2.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-2.5TRG1 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-2.5TRG1?
For technical support, including AP2138R-2.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-2.5TRG1 requirements.
6.How does Aetrix verify that AP2138R-2.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-2.5TRG1 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-2.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-2.5TRG1?
All AP2138R-2.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-2.5TRG1, 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-2.5TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-2.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2138R-2.5TRG1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
