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Diodes Incorporated AP2121AK-1.3TRE1
- Part No.:
- AP2121AK-1.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2121AK-1.3TRE1.pdf
- Description:
- IC REG LINEAR 1.3V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
AP2121AK-1.3TRE1 from Diodes Incorporated is a high-speed, extremely low-noise 1.3V fixed-output LDO regulator in SOT-23-5 package, delivering up to 200mA output current with 30µVrms noise (10Hz–100kHz), 70dB PSRR at 1kHz, and ±2% output voltage accuracy. It features active-high enable control, 25µA quiescent current, and supports ceramic capacitors as low as 1µF - ideal for powering RF front-ends and precision analog circuitry in portable battery-powered devices.
For engineers reviewing the AP2121AK-1.3TRE1 datasheet, AP2121AK-1.3TRE1 pinout, AP2121AK-1.3TRE1 application, or AP2121AK-1.3TRE1 equivalent, key selection criteria include dropout voltage at 100mA (600mV typ), standby current (0.1µA typ), thermal resistance (θJA = 250°C/W), and compatibility with AEC-Q100-capable designs requiring stable low-noise biasing.
Technical Context
The AP2121AK-1.3TRE1 integrates a CMOS-based error amplifier, precision voltage reference, resistor network for fixed 1.3V output, current-limit protection, and chip-enable logic. Its architecture enables fast line and load transient response without external compensation.
Designed for input voltages from 2.3V to 6V, it maintains regulation under dynamic loads up to 200mA while rejecting supply ripple across 10Hz–100kHz bandwidth. The SOT-23-5 package provides dedicated CE and GND pins for noise-sensitive routing and stable ground referencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.3V ±2% - ensures stable bias for 1.3V-core logic or low-voltage ADC references |
| Max Output Current | 200mA continuous - sufficient for powering single-channel RFICs or sensor signal chains |
| Dropout Voltage | 600mV typ @ 100mA - enables operation from 2.3V input while maintaining 1.3V output |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase noise impact on VCOs and PLLs |
| PSRR | 70dB typ @ 1kHz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 25µA typ - extends battery life in always-on sensor nodes and wearables |
| Enable Threshold | VCE(HI) ≥ 1.5V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 package (JEDEC MO-178AA), 5-pin surface-mount, 1.3mm × 2.9mm footprint, 1.45mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Chip Enable input | Active-high logic control; internal 5MΩ pull-down ensures default shutdown on power-up |
| 2 - VIN | Input voltage supply | Accepts 2.3V–6V; requires ≥1µF ceramic input capacitor for stability |
| 3 - GND | Power ground | Dedicated ground pin isolates sensitive feedback path from load return currents |
| 4 - NC | No connection | Internally unconnected; must be left floating or tied to GND per layout best practice |
| 5 - VOUT | Regulated output | Delivers 1.3V ±2%; requires ≥1µF ceramic output capacitor with ESR 0.01–100Ω |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 30µVrms output noise enables clean power for RF transceivers and high-resolution ADCs |
| High PSRR at audio frequencies | 70dB rejection at 1kHz prevents audible artifacts in audio codec supplies |
| Ultra-low standby current | 0.1µA shutdown current preserves battery charge in long-idle IoT endpoints |
| Ceramic capacitor compatibility | Stable with 1µF low-ESR ceramics - eliminates need for costly tantalum or electrolytic caps |
| Precision output accuracy | ±2% over -40°C to +85°C ensures timing margin compliance in digital core rails |
Applications
| RF Front-End Power | Portable Audio Codec Supply |
|---|---|
|
Use Scenario: Powering 1.3V LNA and mixer stages in Bluetooth 5.0 LE transceivers. IC Role / Device Role / Timing Role: Low-noise bias source for RF signal chain; replaces noisier switching regulators in receive path. Use Value: 30µVrms noise prevents reciprocal mixing and maintains EVM < 3% at 2.4GHz. |
Use Scenario: Supplying DAC and headphone amplifier in compact wireless earbuds. IC Role / Device Role / Timing Role: Clean analog rail decoupled from noisy digital domain; enables 110dB SNR performance. Use Value: 70dB PSRR suppresses 1MHz DC/DC switching noise, eliminating audible hiss during playback. |
| Wearable Sensor Node Core | Industrial Smart Sensor Bias |
|
Use Scenario: Providing regulated 1.3V to ultra-low-power MCU and MEMS accelerometer. IC Role / Device Role / Timing Role: Primary system LDO with enable control synchronized to motion-triggered wake-up. Use Value: 0.1µA standby current extends coin-cell life beyond 12 months in intermittent-sampling mode. |
Use Scenario: Biasing precision 24-bit sigma-delta ADC in condition-monitoring vibration sensor. IC Role / Device Role / Timing Role: Reference-grade analog supply isolated from motor-drive PCB noise. Use Value: ±2% output accuracy and ±130µV/°C tempco ensure < 0.1% full-scale error across -40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-13SAG-7 | Successor device: same 1.3V output, 300mA rating, 25µA IQ, but improved 45dB PSRR @ 100kHz and AEC-Q100 Grade 1 qualification | Supports automotive infotainment and ADAS modules requiring PPAP documentation and IATF 16949 traceability | Select when new designs require extended temperature range (-40°C to +125°C) and automotive change control |
| MCP1700T-1302E/TT | 1.3V fixed output, 250mA, 1.6µA IQ, but higher 40µVrms noise and only 60dB PSRR @ 1kHz | Better suited for cost-sensitive industrial controllers where ultra-low noise is secondary to quiescent current | Choose for battery-powered remote sensors prioritizing multi-year shelf life over RF performance |
Compared with AP2121AK-1.3TRE1, AP7343-13SAG-7 offers automotive qualification and higher current capability but trades off some PSRR at mid-frequencies; MCP1700T-1302E/TT delivers lower IQ for longevity-critical systems but lacks the noise performance needed for RF/analog signal chains.
Availability
AP2121AK-1.3TRE1 is available at Aetrix Electronics and suitable for portable medical monitors, wireless sensor networks, and consumer audio accessories requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP2121AK-1.3TRE1 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 ICs, specializing in high-performance power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP2121 series belongs to Diodes' high-speed LDO portfolio, engineered specifically for battery-powered applications demanding ultra-low noise, fast transient response, and minimal quiescent current - with emphasis on RF, audio, and precision analog subsystems.
FAQ
What is the minimum input voltage required for AP2121AK-1.3TRE1 to regulate at 1.3V?
The AP2121AK-1.3TRE1 requires a minimum input voltage of 2.3V to maintain regulation at 1.3V output across its full operating temperature range (-40°C to +85°C). At 100mA load, the typical dropout is 600mV, so VIN must exceed VOUT + VDROP = 1.9V; however, the recommended minimum VIN is 2.3V per datasheet test conditions and line regulation specifications.
Can AP2121AK-1.3TRE1 be used with a 0.47µF output capacitor?
No - the AP2121AK-1.3TRE1 requires a minimum output capacitance of 1µF with ESR between 0.01Ω and 100Ω for guaranteed stability. Using 0.47µF risks oscillation or poor transient response, as confirmed by the datasheet's stability criteria and typical application circuit requirements.
Is the NC pin (Pin 4) in SOT-23-5 required to be grounded?
Pin 4 is internally unconnected and must not be soldered to any net. Diodes Incorporated specifies it as "No Connection" - grounding or routing it may introduce parasitic coupling or violate thermal design rules. Layout guidelines recommend leaving it floating or optionally connecting to GND only if verified via board-level EMI testing.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
Diodes Incorporated has designated AP2121AK-1.3TRE1 as legacy due to the introduction of the AP7343 series, which offers enhanced features including AEC-Q100 qualification, higher output current (300mA), and improved thermal performance. Existing designs may continue using AP2121AK-1.3TRE1, but new projects should evaluate AP7343-13SAG-7 for long-term supply assurance and specification upgrades.
AP2121AK-1.3TRE1 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):
- 1.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- 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
AP2121AK-1.3TRE1 FAQ
1.How can I place an order for AP2121AK-1.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121AK-1.3TRE1 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 AP2121AK-1.3TRE1 reliable?
The price and inventory of AP2121AK-1.3TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121AK-1.3TRE1 is usually 5 days.
3.What payment methods are accepted for AP2121AK-1.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121AK-1.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121AK-1.3TRE1?
AP2121AK-1.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121AK-1.3TRE1 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 AP2121AK-1.3TRE1?
For technical support, including AP2121AK-1.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121AK-1.3TRE1 requirements.
6.How does Aetrix verify that AP2121AK-1.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2121AK-1.3TRE1 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 AP2121AK-1.3TRE1 meets industry standards.
7.What is the process for return or replacement of AP2121AK-1.3TRE1?
All AP2121AK-1.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121AK-1.3TRE1, 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 AP2121AK-1.3TRE1 part is unused and in its original packaging.
Return procedure for AP2121AK-1.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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