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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP2120N-1.5TRG1

Name: AP2120N-1.5TRG1
Brand: Diodes Incorporated
SKU: AP2120N-1.5TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2120N-1.5TRG1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AP2120N-1.5TRG1.pdf

Description:: IC REG LINEAR 1.5V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,611

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Product details

Overview

AP2120N-1.5TRG1 from Diodes Incorporated is a high-speed, extremely low-noise CMOS-based positive LDO regulator delivering 1.5V ±2% output voltage with 150mA continuous output current, 400–600mV dropout at 100mA, and 15µV_rms output noise (10Hz–100kHz). It operates from 2.5V to 6V input and targets precision power rails in battery-powered portable electronics.

For engineers reviewing the AP2120N-1.5TRG1 datasheet, AP2120N-1.5TRG1 pinout, AP2120N-1.5TRG1 application, or AP2120N-1.5TRG1 equivalent, key selection criteria include ultra-low noise performance, tight output voltage accuracy, compatibility with 1µF ceramic capacitors, and SOT-23 footprint constraints in space-constrained designs.

Technical Context

The AP2120N-1.5TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.5V output, and current-limit protection circuitry. Its CMOS process enables low quiescent current (25µA typical) and high PSRR (65dB at 1kHz), critical for noise-sensitive analog and RF subsystems.

It features excellent transient response under load and line steps, supports stable operation with low-ESR ceramic capacitors ≥1µF, and maintains ±2% output accuracy across –40°C to +85°C junction temperature range without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.5V ±2% - ensures stable core or I/O rail for low-voltage microcontrollers and sensors
Dropout Voltage	400–600mV at 100mA - enables regulation from 2.5V input down to 1.5V output with margin
RMS Output Noise	15µV_rms (10Hz–100kHz) - preserves signal integrity in ADC reference, RF bias, and audio paths
PSRR	65dB at 1kHz - suppresses switching noise from upstream DC/DC converters
Quiescent Current	25µA typical - extends battery life in always-on or low-duty-cycle portable devices
Load Regulation	12mV typical (1–80mA) - minimizes output shift during dynamic current draw
Line Regulation	4mV typical (2.5–6V input) - maintains stability despite battery voltage sag

Pinout & Package

SOT-23 (N package), 3-pin surface-mount, moisture sensitivity level 1 per J-STD-020, lead-free and RoHS compliant, 0.009g weight.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Primary return path for output current and internal bias; requires low-impedance PCB connection
2 VOUT	Regulated output	Delivers 1.5V ±2% to load; connects directly to decoupling capacitor and downstream circuitry
3 VIN	Input supply	Accepts 2.5–6V unregulated input; must be bypassed with ≥1µF ceramic capacitor

Key Features

Feature	Design Value
Ultra-low noise output	15µV_rms (10Hz–100kHz) - enables clean power for precision analog and RF ICs
Low dropout at full load	600mV max at 100mA - supports single-cell Li-ion or multi-cell alkaline operation
Ceramic capacitor compatible	Stable with ≥1µF, 0.01–100Ω ESR - eliminates need for bulkier tantalum or electrolytic caps
High PSRR	65dB at 1kHz - rejects ripple from switching regulators feeding the LDO input
Tight output accuracy	±2% over temperature and load - reduces need for post-regulation trimming in production

Applications

Mobile Phone Baseband Power

Wireless Sensor Node Core Supply

Use Scenario: Powering baseband processor I/O banks and analog front-end in 4G/5G handsets.

IC Role / Device Role / Timing Role: Primary low-noise 1.5V rail generator for mixed-signal SoC interfaces.

Use Value: 15µV_rms noise prevents SNR degradation in RF transceivers and ADCs sharing the same power domain.

Use Scenario: Supplying ultra-low-power microcontroller and BLE radio in battery-operated industrial sensors.

IC Role / Device Role / Timing Role: Standby-mode LDO providing regulated 1.5V to MCU core and radio PHY.

Use Value: 25µA quiescent current extends 10-year battery life; 1µF ceramic compatibility simplifies layout in compact modules.

Digital Camera Image Sensor Bias

Portable Medical Pulse Oximeter Analog Rail

Use Scenario: Generating clean bias voltage for CMOS image sensor analog blocks and ADC reference.

IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital switching noise.

Use Value: 65dB PSRR and 15µV_rms noise prevent fixed-pattern noise and quantization errors in raw image data.

Use Scenario: Powering photodiode amplifier, analog front-end, and ADC in handheld pulse oximeters.

IC Role / Device Role / Timing Role: Precision analog voltage source for signal chain components requiring stable DC offset.

Use Value: ±2% output accuracy and <12mV load regulation ensure consistent LED drive and signal gain calibration across battery discharge cycle.

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
MCP1700T-1502E/TT	250mA output, 170mV dropout at 250mA, 30µV_rms noise, no current limit	Higher output current but higher noise; lacks short-circuit protection	Preferred when >150mA load or lower dropout is required, and noise tolerance is relaxed
TPS7A2015PDQNR	300mA output, 130mV dropout at 300mA, 12µV_rms noise, enable pin, thermal shutdown	Includes enable control and thermal protection; tighter noise spec but larger DQN package	Chosen when system-level sequencing or enhanced fault protection is needed, and board area permits 2mm × 2mm DFN

Compared with MCP1700T-1502E/TT, AP2120N-1.5TRG1 offers superior noise rejection and integrated current limiting; versus TPS7A2015PDQNR, it trades enable functionality and lower noise for smaller SOT-23 footprint and lower cost in volume production.

Availability

AP2120N-1.5TRG1 is available at Aetrix Electronics and suitable for mobile phone power management, wireless sensor node design, portable medical instrumentation, and camera module development requiring stable component supply and long-term manufacturability.

Supply support for AP2120N-1.5TRG1 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP2120 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and small-footprint regulation.

FAQ

What is the minimum input voltage required for stable 1.5V output?

The AP2120N-1.5TRG1 requires a minimum input voltage of 2.5V to maintain regulation at full load, based on its maximum dropout voltage of 600mV at 100mA. At lighter loads (≤10mA), input can drop to 2.1V while sustaining 1.5V output, but design margin should retain ≥2.5V for robust operation across temperature and process variation.

Can AP2120N-1.5TRG1 operate with a 0.47µF output capacitor?

No - the datasheet specifies 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; ceramic capacitors rated ≥1µF, X5R/X7R dielectric, are recommended and validated.

Does AP2120N-1.5TRG1 include thermal shutdown protection?

No - the AP2120N-1.5TRG1 integrates overcurrent limiting (50mA short-circuit current limit) but does not include thermal shutdown circuitry. Safe operation requires PCB thermal design with adequate copper pour and ambient temperature within –40°C to +85°C, respecting θ_JA = 250°C/W for SOT-23.

Is AP2120N-1.5TRG1 qualified for automotive applications?

No - AP2120N-1.5TRG1 is specified for commercial/industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive use, Diodes offers the AP7361Q series, which meets AEC-Q100 Grade 1 and is manufactured in IATF 16949-certified facilities.

AP2120N-1.5TRG1 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:: Active

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:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: -

PSRR:: 65dB (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

AP2120N-1.5TRG1 FAQ

1.How can I place an order for AP2120N-1.5TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2120N-1.5TRG1 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 AP2120N-1.5TRG1 reliable?

The price and inventory of AP2120N-1.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2120N-1.5TRG1 is usually 5 days.

3.What payment methods are accepted for AP2120N-1.5TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2120N-1.5TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2120N-1.5TRG1?

AP2120N-1.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2120N-1.5TRG1 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 AP2120N-1.5TRG1?

For technical support, including AP2120N-1.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2120N-1.5TRG1 requirements.

6.How does Aetrix verify that AP2120N-1.5TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2120N-1.5TRG1 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 AP2120N-1.5TRG1 meets industry standards.

7.What is the process for return or replacement of AP2120N-1.5TRG1?

All AP2120N-1.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2120N-1.5TRG1, 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 AP2120N-1.5TRG1 part is unused and in its original packaging.

Return procedure for AP2120N-1.5TRG1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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