My Inquiry
My Account
Diodes Incorporated AP2138R-3.3TRG1
- Part No.:
- AP2138R-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP2138R-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 250MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:4,059
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP2138R-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 primary power rail for ultra-low-power microcontrollers and sensors in battery-constrained portable devices.
For engineers reviewing the AP2138R-3.3TRG1 datasheet, AP2138R-3.3TRG1 pinout, AP2138R-3.3TRG1 application, or AP2138R-3.3TRG1 equivalent, key selection criteria include its ultra-low IQ for multi-year battery life, tight VOUT tolerance for precision analog supply, thermal performance in SOT-23-3, and absence of enable control-distinguishing it from AP2139 variants.
Technical Context
The AP2138R-3.3TRG1 integrates a precision voltage reference, error amplifier, and resistor network to maintain stable 3.3V output across input voltages from 2.5V to 6.0V. Its CMOS pass element enables low dropout and minimal quiescent current without PNP bipolar trade-offs.
It operates over –40°C to +85°C ambient temperature with ±100ppm/°C output voltage temperature coefficient and supports ceramic output capacitors ≥1µF (ESR 0.01Ω–100Ω). No enable pin or discharge circuit is present-consistent with AP2138 series architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% (3.234V–3.366V); ensures compatibility with 3.3V logic and analog ICs without external trimming. |
| Quiescent Current | 1.0µA typical; enables >10-year battery life in always-on IoT sensors powered by coin cells. |
| Max Output Current | 250mA; sufficient for MCU + RF transceiver + sensor subsystems in compact wearables. |
| Dropout Voltage | 20mV typical at 10mA; allows regulation down to VIN = 3.32V, extending usable battery range. |
| Load Regulation | 25mV typical (1–100mA); maintains stable supply during dynamic processor load transitions. |
| Line Regulation | 6mV typical (2.5–6.0V input); rejects ripple and sag from aging or discharging batteries. |
| Temp Coefficient | ±100ppm/°C; contributes <±0.028V drift over –40°C to +85°C, critical for precision ADC references. |
Pinout & Package
SOT-23-3 package: small-outline transistor outline with 3 terminals, surface-mount, lead-free and RoHS-compliant. Thermal resistance θJA = 250°C/W, θJC = 81.9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for input/output current; must connect to low-impedance PCB ground plane. |
| 2 (VOUT) | Regulated output | Delivers stable 3.3V to load; requires ≥1µF ceramic capacitor placed adjacent to pin for stability. |
| 3 (VIN) | Input supply | Accepts 2.5–6.0V unregulated source; requires ≥1µF ceramic decoupling capacitor at entry point. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0µA typical enables multi-year operation on CR2032 (220mAh) powering 10µA sleep-mode systems. |
| Fixed 3.3V output | No external resistors required-reduces BOM count and layout area in space-constrained modules. |
| ±2% output accuracy | Meets tight supply tolerance for 3.3V I/O domains in ARM Cortex-M and BLE SoCs without calibration. |
| Low dropout at light load | 20mV dropout at 10mA permits use with single-cell Li-ion (3.0–3.6V) throughout full discharge curve. |
| Ceramic capacitor compatible | Stable with 1µF X7R ceramics (0.01–100Ω ESR), eliminating need for bulkier tantalum or electrolytic caps. |
Applications
| Wearable Health Monitor | Smart Sensor Node |
|---|---|
Use Scenario: Continuous ECG and SpO₂ sensing powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying analog front-end, ultra-low-power MCU, and BLE radio. Use Value: 1.0µA IQ minimizes standby drain; ±2% VOUT ensures consistent ADC reference across temperature and battery voltage. |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Main power regulator for sensor ICs and sub-GHz transceiver during brief active bursts. Use Value: 20mV dropout at 10mA extends usable battery voltage down to 3.32V, increasing effective capacity by ~15%. |
| Industrial Handheld Scanner | Portable Audio Recorder |
Use Scenario: Rugged barcode scanner using single-cell Li-ion, requiring reliable 3.3V rail during motor-triggered decode cycles. IC Role / Device Role / Timing Role: Stable power source for image sensor, laser driver, and decoding ASIC under pulsed 200mA loads. Use Value: 250mA rating and 25mV load regulation prevent brownouts during peak current demand from CMOS image capture. |
Use Scenario: Flash-based voice recorder operating from AAA alkaline cells with no charging circuitry. IC Role / Device Role / Timing Role: Clean 3.3V supply for audio codec, flash memory controller, and microSD interface. Use Value: ±100ppm/°C tempco ensures <±0.028V VOUT shift over operating range, preserving audio SNR and flash write margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7354-33SAG-7 | Successor LDO with same 3.3V output, 250mA rating, but lower 0.6µA IQ and improved PSRR (65dB @ 1kHz). | Recommended for new designs requiring longer battery life or higher noise immunity in RF-sensitive layouts. | Select AP7354 if designing for production beyond Q3 2025; AP2138R-3.3TRG1 remains viable for legacy replacement or cost-sensitive volume builds. |
| MCP1700T-3302E/TT | Microchip 3.3V LDO with 1.6µA IQ, 250mA rating, and wider input range (2.3–6.0V), but higher 175mV dropout at 250mA. | Better suited for ultra-low-VIN applications (e.g., single NiMH cell), but less efficient at maintaining regulation near battery cutoff. | Choose MCP1700T only when VIN may dip below 2.5V; AP2138R-3.3TRG1 provides superior dropout performance above 2.5V. |
Compared with AP7354-33SAG-7, AP2138R-3.3TRG1 trades 0.4µA higher IQ for proven field reliability and broader distributor stock; versus MCP1700T-3302E/TT, it delivers 155mV lower dropout at full load-critical for maximizing runtime from lithium primaries.
Availability
AP2138R-3.3TRG1 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, industrial handheld scanners, and portable audio recorders requiring stable component supply with long-term lifecycle visibility.
Supply support for AP2138R-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 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, engineered specifically for battery-powered portable electronics where extended operational lifetime and minimal voltage overhead are design-critical.
FAQ
What is the minimum input voltage required for AP2138R-3.3TRG1 to regulate at 3.3V?
The device requires VIN ≥ 2.5V for guaranteed operation per Recommended Operating Conditions. At 250mA load, dropout is 400–600mV, so minimum functional VIN is ~3.7V. However, at 10mA load, dropout drops to 20mV, allowing regulation down to 3.32V-enabling use with nearly depleted lithium cells.
Does AP2138R-3.3TRG1 include an enable pin or shutdown function?
No. AP2138R-3.3TRG1 is part of the AP2138 series, which lacks enable (CE) and quick-discharge functionality. These features exist only in the AP2139 series (e.g., AP2139R-3.3TRG1 in SOT-23-5). This simplifies design for always-on applications but precludes software-controlled power gating.
Can AP2138R-3.3TRG1 be used with aluminum polymer or tantalum output capacitors?
While ceramic capacitors are recommended and fully characterized for stability, aluminum polymer (ESR ~10–50mΩ) and tantalum (ESR ~70–150mΩ) may be used if ESR falls within the 0.01–100Ω window specified in the datasheet. However, phase margin verification is advised due to potential resonance with higher-ESR types.
Is AP2138R-3.3TRG1 qualified for automotive applications?
No. The AP2138/2139 series is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade versions require separate qualification (PPAP, IATF 16949 manufacturing) and should be requested directly through their automotive sales channel-not via standard part numbers like AP2138R-3.3TRG1.
AP2138R-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
AP2138R-3.3TRG1 FAQ
1.How can I place an order for AP2138R-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2138R-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 AP2138R-3.3TRG1 reliable?
The price and inventory of AP2138R-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 AP2138R-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AP2138R-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2138R-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2138R-3.3TRG1?
AP2138R-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2138R-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 AP2138R-3.3TRG1?
For technical support, including AP2138R-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2138R-3.3TRG1 requirements.
6.How does Aetrix verify that AP2138R-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2138R-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 AP2138R-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AP2138R-3.3TRG1?
All AP2138R-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2138R-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 AP2138R-3.3TRG1 part is unused and in its original packaging.
Return procedure for AP2138R-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP2138R-3.3TRG1 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…
