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Diodes Incorporated AP2122AK-1.8TRE1
- Part No.:
- AP2122AK-1.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-1.8TRE1.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
AP2122AK-1.8TRE1 from Diodes Incorporated is a fixed-output 1.8 V, high-speed, ultra-low-noise LDO regulator in SOT-23-5 package, delivering ≥150 mA output current with 150 mV typical dropout at 100 mA, 30 µVRMS output noise (10 Hz–100 kHz), and 70 dB PSRR at 10 kHz - optimized for powering noise-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2122AK-1.8TRE1 datasheet, AP2122AK-1.8TRE1 pinout, AP2122AK-1.8TRE1 application, or AP2122AK-1.8TRE1 equivalent, key selection criteria include low-quiescent-current operation (25 µA typ), active-high enable with internal pull-down (2.5–10 MΩ), ±2% output voltage accuracy, and compatibility with 1 µF ceramic output capacitors.
Technical Context
The AP2122AK-1.8TRE1 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit protection within a single-die architecture. Its active-high CE input enables precise power sequencing control, while the internal pull-down resistor ensures default shutdown during floating conditions.
Designed for stable regulation under fast load transients, it achieves excellent line regulation (4 mV typ) and load regulation (12 mV typ), with thermal shutdown and short-circuit current limiting (50 mA typ) ensuring robust operation across –40°C to +85°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - ensures stable core supply for 1.8 V logic, ADC references, and RF front-end biasing. |
| Dropout Voltage | 150 mV typ @ 100 mA - enables operation from 1.95 V input, supporting single-cell Li-ion or dual-cell alkaline sources. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - minimizes phase jitter in clocked circuits and preserves SNR in audio/RF signal chains. |
| PSRR | 70 dB typ @ 10 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 25 µA typ - extends battery life in always-on sensor nodes and standby modes of portable devices. |
| Enable Threshold | CE "High" ≥1.5 V, "Low" ≤0.25 V - compatible with 1.8 V and 3.3 V GPIOs without level-shifting. |
| Thermal Resistance | θJA = 250 °C/W - supports continuous 150 mA output at ambient ≤65°C with standard PCB copper area. |
Pinout & Package
SOT-23-5 package: 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, JEDEC MO-178AC compliant, rated for reflow soldering up to 260°C (10 sec).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output terminal | Delivers stable 1.8 V to load; requires ≥1 µF ceramic capacitor (ESR 0.01–100 Ω) for stability. |
| 2 - GND | Power ground reference | Low-impedance return path for output current and internal bias; must be connected directly to PCB ground plane. |
| 3 - VIN | Unregulated input supply | Accepts 2–6 V input; minimum headroom defined by dropout voltage; requires 1 µF input ceramic capacitor. |
| 4 - CE | Active-high enable control | Logic high (≥1.5 V) enables regulation; logic low (≤0.25 V) disables output and reduces ISTD to 0.1 µA typ. |
| 5 - NC | No connection | Internally unconnected; must remain floating - no external tie or routing permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30 µVRMS over 10 Hz–100 kHz band - eliminates need for additional post-regulation filtering in precision analog stages. |
| Low dropout at full load | 150 mV typical @ 100 mA - maximizes usable battery voltage range and improves system efficiency in low-input scenarios. |
| Integrated CE pull-down | 2.5–10 MΩ internal resistor - guarantees defined OFF state without external components, simplifying power sequencing design. |
| Ceramic capacitor compatible | Stable with ≥1 µF X5R/X7R ceramics (ESR 0.01–100 Ω) - eliminates reliance on higher-cost, larger tantalum or electrolytic capacitors. |
| High PSRR across frequency | 70 dB @ 10 kHz, >40 dB up to 1 MHz - effectively isolates sensitive loads from ripple generated by switching regulators. |
Applications
| Portable Audio Codec Power | Wi-Fi/BT Baseband Core Supply |
|---|---|
|
Use Scenario: Powering DAC/ADC sections and analog front-ends in Bluetooth headphones and voice-controlled speakers. IC Role / Device Role / Timing Role: Low-noise local regulation for signal chain biasing, replacing noisy switched-mode supplies. Use Value: 30 µVRMS noise prevents audible hiss and preserves dynamic range in 24-bit audio paths. |
Use Scenario: Supplying 1.8 V core voltage to Wi-Fi 6/Bluetooth 5.0 SoCs in IoT edge nodes and wearables. IC Role / Device Role / Timing Role: Primary LDO for digital baseband logic, enabling clean power during burst transmit/receive cycles. Use Value: 70 dB PSRR at 10 kHz suppresses switching noise from PMIC DC/DC converters sharing same battery rail. |
| Industrial Sensor Signal Conditioning | Camera Module Image Sensor Bias |
|
Use Scenario: Regulating power for precision op-amps, instrumentation amplifiers, and sigma-delta ADCs in smart sensors. IC Role / Device Role / Timing Role: Ultra-stable analog rail generator with minimal thermal drift (±100 ppm/°C). Use Value: ±2% initial accuracy and <±180 µV/°C tempco ensure consistent offset and gain calibration over –40°C to +85°C. |
Use Scenario: Providing clean 1.8 V bias to CMOS image sensor I/O and PLL circuits in compact camera modules. IC Role / Device Role / Timing Role: Dedicated low-noise supply for timing-sensitive pixel readout and clock generation blocks. Use Value: Fast load transient response (<20 µs settling) maintains voltage stability during frame capture bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-18SAG-7 | Higher quiescent current (50 µA typ), lower PSRR (60 dB @ 10 kHz), same 1.8 V output and SOT-23-5 package. | Less suitable for ultra-low-power always-on sensing; adequate for cost-sensitive consumer audio. | Prefer AP2122AK-1.8TRE1 when noise or standby current is critical; AP7315 offers lower unit cost where specs permit. |
| MCP1700-1802E/TO | Higher dropout (300 mV @ 100 mA), higher noise (60 µVRMS), TO-92 package - not pin-compatible. | Requires larger board area and cannot support same input voltage headroom or noise performance. | Only consider if legacy TO-92 footprint is mandatory; AP2122AK-1.8TRE1 delivers superior electrical performance in SOT-23-5. |
Compared with AP7315-18SAG-7 and MCP1700-1802E/TO, the AP2122AK-1.8TRE1 provides the lowest noise and dropout in its class, enabling longer battery runtime and higher signal integrity in space-constrained, noise-sensitive designs - making it the preferred choice for next-generation portable and industrial edge devices.
Availability
AP2122AK-1.8TRE1 is available at Aetrix Electronics and suitable for portable audio systems, wireless connectivity modules, industrial sensor nodes, and camera subsystems requiring stable component supply with guaranteed long-term manufacturability.
Supply support for AP2122AK-1.8TRE1 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, with design and manufacturing operations across Asia, the US, and Europe.
The AP2122 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered and noise-critical applications demanding ultra-low noise, fast transient response, and minimal quiescent power consumption.
FAQ
What is the minimum input voltage required for stable 1.8 V output at 100 mA?
The AP2122AK-1.8TRE1 requires VIN ≥ 1.95 V to maintain regulation at 100 mA load, based on its 150 mV typical dropout voltage. Operation below this threshold causes output droop or dropout; absolute minimum VIN is 2.0 V per recommended operating conditions, with 6 V maximum.
Can the AP2122AK-1.8TRE1 be used with a 0.47 µF output capacitor?
No - the datasheet specifies a minimum 1 µF ceramic output capacitor (ESR 0.01–100 Ω) for stability. Using 0.47 µF risks oscillation or poor transient response; 1 µF is the verified lower bound confirmed across temperature and load conditions in Diodes' characterization.
Is the NC pin (Pin 5) safe to connect to ground?
No - Pin 5 is internally unconnected and must remain electrically floating. Grounding or routing this pin may cause unpredictable behavior or damage; the SOT-23-5 layout must isolate Pin 5 from all conductive traces and planes per Diodes' recommended pad design.
Does the AP2122AK-1.8TRE1 include thermal shutdown protection?
Yes - the device incorporates thermal shutdown that activates at +150°C junction temperature (absolute maximum rating), latching off until die temperature falls below the hysteresis threshold. This protects against sustained overload or inadequate PCB heat sinking during continuous 150 mA operation.
AP2122AK-1.8TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2122AK-1.8TRE1 FAQ
1.How can I place an order for AP2122AK-1.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-1.8TRE1 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 AP2122AK-1.8TRE1 reliable?
The price and inventory of AP2122AK-1.8TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-1.8TRE1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-1.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-1.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-1.8TRE1?
AP2122AK-1.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-1.8TRE1 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 AP2122AK-1.8TRE1?
For technical support, including AP2122AK-1.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-1.8TRE1 requirements.
6.How does Aetrix verify that AP2122AK-1.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-1.8TRE1 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 AP2122AK-1.8TRE1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-1.8TRE1?
All AP2122AK-1.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-1.8TRE1, 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 AP2122AK-1.8TRE1 part is unused and in its original packaging.
Return procedure for AP2122AK-1.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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