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Diodes Incorporated AP2121N-1.5TRE1
- Part No.:
- AP2121N-1.5TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP2121N-1.5TRE1.pdf
- Description:
- IC REG LINEAR 1.5V 200MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,107
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Product details
Overview
AP2121N-1.5TRE1 from Diodes Incorporated is a 1.5V fixed-output, high-speed, ultra-low-noise CMOS LDO regulator in SOT-23-5 package, delivering up to 200mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy over -40°C to +85°C. It serves as a precision local power rail for noise-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2121N-1.5TRE1 datasheet, AP2121N-1.5TRE1 pinout, AP2121N-1.5TRE1 application, or AP2121N-1.5TRE1 equivalent, key selection criteria include its low quiescent current (25µA typ), high PSRR (70dB @ 1kHz), compatibility with 1µF ceramic output capacitors, and active-high enable functionality - all critical for low-power, high-stability power management in space-constrained designs.
Technical Context
The AP2121N-1.5TRE1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.5V output, current-limit protection, and an active-high chip-enable circuit. Its CMOS process enables low quiescent and standby currents while maintaining fast load transient response.
Designed for stable operation with low-ESR ceramic capacitors ≥1µF, it features excellent line regulation (4mV typ) and load regulation (12mV typ), enabling reliable performance across input voltage variations (2V–6V) and output load steps (1mA–200mA) without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±2% - ensures stable biasing for 1.5V logic or analog rails within tight tolerance across temperature and load. |
| Max Output Current | 200mA continuous - supports moderate-power subsystems like RF front-ends or sensor signal chains. |
| Dropout Voltage | 400–600mV @ IOUT = 100mA - enables operation from 2.5V input while maintaining regulation, critical for single-cell Li-ion or dual-cell alkaline systems. |
| Output Noise | 30µVrms (10Hz–100kHz) - minimizes interference in ADC references, audio codecs, and RF synthesizers. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Quiescent Current | 25µA typical - extends battery life in always-on monitoring circuits and low-duty-cycle IoT endpoints. |
| Enable Threshold | VCE(HI) ≥ 1.5V, VCE(LO) ≤ 0.25V - compatible with 1.8V/3.3V GPIOs for precise system-level power sequencing. |
Pinout & Package
SOT-23-5 package (3.0mm × 1.7mm × 1.3mm height), surface-mount, RoHS-compliant, with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CE | Active-high enable input | Logic high (≥1.5V) enables regulation; logic low (≤0.25V) places device in 0.1µA standby mode - enables dynamic power gating. |
| 2 - VIN | Input voltage supply | Accepts 2V–6V input; requires ≥1µF ceramic input capacitor for stability and ripple filtering. |
| 3 - GND | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance for noise control. |
| 4 - NC | No connection | Internally unconnected; must be left floating or tied to GND per layout best practice - no electrical function. |
| 5 - VOUT | Regulated output | Delivers stable 1.5V ±2%; requires ≥1µF ceramic output capacitor (ESR 0.01Ω–100Ω) for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 30µVrms (10Hz–100kHz) - preserves SNR in precision analog signal paths without additional filtering. |
| High PSRR at 1kHz | 70dB - rejects ripple from switching regulators, reducing need for multi-stage filtering. |
| Low quiescent current | 25µA typical - enables >1-year battery life in coin-cell-powered sensors with 10µA average system load. |
| Fast load transient response | Sub-10µs recovery from 10–90% load step - maintains voltage integrity during burst-mode MCU or radio activity. |
| Ceramic capacitor compatible | Stable with ≥1µF X5R/X7R ceramics - eliminates need for larger, less reliable tantalum or electrolytic capacitors. |
Applications
| Mobile Phone Baseband Power | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Powering baseband processor I/O banks and PLL reference voltage inputs in LTE/5G handsets. IC Role / Device Role / Timing Role: Low-noise local LDO supplying clean 1.5V to sensitive analog blocks adjacent to noisy digital cores. Use Value: 30µVrms noise and 70dB PSRR prevent clock jitter and data corruption in high-speed serial interfaces. |
Use Scenario: Providing regulated bias for ECG/PPG analog front-end amplifiers in wearable health monitors. IC Role / Device Role / Timing Role: Precision voltage source for op-amp rails and ADC reference buffers in ultra-low-power biosignal acquisition. Use Value: ±2% output accuracy and <12mV load regulation ensure consistent gain and offset calibration across battery discharge. |
| Wireless Audio Codec Supply | Industrial IoT Edge Node Core Rail |
Use Scenario: Powering DACs, headphone amplifiers, and MEMS microphone bias in Bluetooth earbuds. IC Role / Device Role / Timing Role: Ultra-low-noise post-regulator after buck converter, decoupling digital switching noise from audio path. Use Value: 30µVrms noise floor directly translates to >100dB THD+N performance in Class-D amplifier stages. |
Use Scenario: Supplying 1.5V core voltage to ARM Cortex-M0+ microcontrollers and sub-GHz transceivers in smart metering nodes. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep power states with 0.1µA shutdown current. Use Value: Active-high CE interface simplifies GPIO-driven power sequencing, reducing BOM count versus discrete MOSFET solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-15SAG-7 | Successor LDO with identical 1.5V output, 300mA rating, lower 200mV dropout, and improved 25µVrms noise. | Pin-compatible replacement with enhanced thermal performance (θJA = 190°C/W vs. 250°C/W) and AEC-Q100 qualification option. | Select for new designs requiring longer product lifecycle support and automotive-grade variants. |
| MCP1700-1502E/TO | 1.5V, 250mA LDO with 6µA quiescent current but higher 115µVrms noise and 120mV dropout only at 250mA. | Lacks enable pin; requires external logic for power gating; optimized for ultra-low-IQ, not low-noise. | Prefer only when standby current is primary constraint and noise sensitivity is secondary. |
Compared with AP7343-15SAG-7, AP2121N-1.5TRE1 offers proven field reliability but higher dropout and noise; versus MCP1700-1502E/TO, it trades ultra-low IQ for superior noise and enable control - making it optimal for noise-critical, enable-driven portable systems where Diodes' long-term supply continuity is valued.
Availability
AP2121N-1.5TRE1 is available at Aetrix Electronics and suitable for mobile phone baseband power, portable medical sensor bias, wireless audio codec supply, and industrial IoT edge node core rails requiring stable component supply across extended production cycles.
Supply support for AP2121N-1.5TRE1 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 facilities certified to IATF 16949 and AEC-Q standards.
The AP2121 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, fast transient response, and minimal quiescent power consumption.
FAQ
What is the minimum input voltage required for AP2121N-1.5TRE1 to maintain regulation at full load?
The AP2121N-1.5TRE1 requires VIN ≥ 2.5V to sustain 1.5V output at 200mA load, based on its maximum dropout of 600mV (per DS46506 Rev. 3, p.6). At 100mA, dropout drops to 400–600mV, allowing operation from 1.9V input - but 2.5V is the recommended minimum for guaranteed full-load performance across temperature and process variation.
Can AP2121N-1.5TRE1 be used with a 0.47µF output capacitor?
No - the datasheet mandates ≥1µF ceramic output capacitance (ESR 0.01Ω–100Ω) for stability (DS46506 p.2). Using 0.47µF risks oscillation or poor transient response due to insufficient phase margin; 1µF is the absolute minimum validated value, and 2.2µF is recommended for robustness across voltage and temperature.
Is the NC pin (Pin 4) required to be grounded or left floating?
Pin 4 is internally unconnected and must be left floating per Diodes' design guidance (DS46506 p.2). While grounding it poses no immediate failure, doing so may introduce unintended parasitic coupling or violate layout rules for unused pins; the safe, specified practice is to leave it unconnected and avoid routing traces to it.
Does AP2121N-1.5TRE1 support reverse current blocking?
No - the AP2121N-1.5TRE1 lacks internal reverse-current protection. If VOUT exceeds VIN (e.g., during hot-swap or backup-battery scenarios), current can flow backward from output to input through the pass transistor's body diode. An external reverse-blocking Schottky diode or ideal diode controller is required for such topologies.
AP2121N-1.5TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP2121N-1.5TRE1 FAQ
1.How can I place an order for AP2121N-1.5TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2121N-1.5TRE1 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 AP2121N-1.5TRE1 reliable?
The price and inventory of AP2121N-1.5TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2121N-1.5TRE1 is usually 5 days.
3.What payment methods are accepted for AP2121N-1.5TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2121N-1.5TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2121N-1.5TRE1?
AP2121N-1.5TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2121N-1.5TRE1 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 AP2121N-1.5TRE1?
For technical support, including AP2121N-1.5TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2121N-1.5TRE1 requirements.
6.How does Aetrix verify that AP2121N-1.5TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2121N-1.5TRE1 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 AP2121N-1.5TRE1 meets industry standards.
7.What is the process for return or replacement of AP2121N-1.5TRE1?
All AP2121N-1.5TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2121N-1.5TRE1, 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 AP2121N-1.5TRE1 part is unused and in its original packaging.
Return procedure for AP2121N-1.5TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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