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

Diodes Incorporated AP2120N-3.2TRG1

Name: AP2120N-3.2TRG1
Brand: Diodes Incorporated
SKU: AP2120N-3.2TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2120N-3.2TRG1

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: AP2120N-3.2TRG1.pdf

Description:: IC REG LINEAR 3.2V 150MA SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,421

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Product details

Overview

AP2120N-3.2TRG1 from Diodes Incorporated is a high-speed, extremely low-noise CMOS-based positive LDO regulator delivering 3.2V ±2% output at up to 150mA load, with 200mV typical dropout at 100mA, 65dB PSRR at 1kHz, and 30µV_rms output noise (10Hz–100kHz), optimized for battery-powered portable electronics requiring stable, clean power.

For engineers reviewing the AP2120N-3.2TRG1 datasheet, AP2120N-3.2TRG1 pinout, AP2120N-3.2TRG1 application, or AP2120N-3.2TRG1 equivalent, key selection criteria include ultra-low quiescent current (25µA typ), compatibility with 1µF ceramic capacitors, SOT-23 package thermal performance (θ_JA = 250°C/W), and operation across –40°C to +85°C junction temperature.

Technical Context

The AP2120N-3.2TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.2V output, and current-limit protection in a single CMOS IC. It achieves excellent line regulation (4mV typ) and load regulation (12mV typ) while maintaining stability with low-ESR ceramic capacitors as small as 1µF.

Its architecture delivers fast transient response to both line (VIN step change) and load (0–150mA step) events, supported by high PSRR (65dB @ 1kHz) and low temperature coefficient (±320µV/°C). Dropout voltage remains ≤300mV up to 150mA output under 4.2V input.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.2V ±2% - ensures stable core/sensor rail within tight tolerance across temperature and load
Max Output Current	150mA continuous - supports moderate-power microcontrollers, RF front-ends, and analog sensors
Dropout Voltage	200mV typ @ 100mA - enables operation from single Li-ion (3.0–4.2V) or two alkaline cells with margin
Quiescent Current	25µA typ - extends battery life in always-on or low-duty-cycle portable devices
PSRR	65dB @ 1kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input
Output Noise	30µV_rms (10Hz–100kHz) - meets low-noise requirements for ADC references and RF VCOs
Operating Temp	–40°C to +85°C - qualified for industrial and consumer portable equipment environments

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Low-impedance return path for output current and internal bias; must be connected to clean system ground plane
2 VOUT	Regulated output	Delivers stable 3.2V to load; requires ≥1µF ceramic capacitor (0.01–100Ω ESR) for stability
3 VIN	Input supply	Accepts 2.0–6.0V input; minimum 1µF ceramic capacitor required on this node to suppress ripple

Key Features

Feature	Design Value
Ultra-low noise regulation	30µV_rms output noise enables use in precision analog and RF signal chains without additional filtering
Low-ESR capacitor support	Stable with 1µF ceramic output cap (0.01–100Ω ESR) - reduces BOM count and board space vs. tantalum alternatives
High PSRR at audio frequencies	65dB rejection at 1kHz - effectively isolates sensitive loads from switching regulator coupling
Fast load transient response	Minimal output voltage dip during 0→150mA step - maintains logic-level integrity for microcontrollers and sensors
Wide input voltage range	2.0–6.0V operation - accommodates varied battery chemistries (Li-ion, NiMH, alkaline) and intermediate rails

Applications

Mobile Phone Subsystem Power

Wireless Sensor Node Core Rail

Use Scenario: Powering baseband processor I/O banks and camera sensor interface in compact smartphones.

IC Role / Device Role / Timing Role: Primary low-noise 3.2V LDO supplying noise-sensitive analog blocks adjacent to high-speed digital circuitry.

Use Value: 30µV_rms noise and 65dB PSRR prevent coupling into image signal chain, preserving SNR in low-light capture.

Use Scenario: Providing regulated 3.2V to ultra-low-power MCU, BLE radio, and environmental sensors in battery-operated IoT nodes.

IC Role / Device Role / Timing Role: Main system regulator enabling >5-year battery life via 25µA quiescent current and 150mA peak delivery.

Use Value: Compatibility with 1µF ceramic caps simplifies layout and eliminates electrolytic/tantalum reliability concerns in field-deployed units.

Digital Camera Image Sensor Bias

Portable Medical Diagnostic Module

Use Scenario: Supplying clean bias voltage to CMOS image sensor analog front-end (AFE) in action cameras and drones.

IC Role / Device Role / Timing Role: Low-noise post-regulator downstream of buck converter, rejecting switching artifacts before AFE input.

Use Value: 200mV dropout at 100mA allows direct regulation from partially discharged Li-ion (≥3.4V), maximizing runtime.

Use Scenario: Powering precision ADC, op-amp signal conditioning, and display driver in handheld diagnostic tools.

IC Role / Device Role / Timing Role: Stable 3.2V reference-grade rail ensuring <±0.5% measurement accuracy across operating temperature.

Use Value: ±2% output accuracy and ±320µV/°C tempco meet Class II medical device calibration stability requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-3302E/TT	3.3V output (0.1V higher), 250mA limit, 6µA IQ, but only 55dB PSRR @ 1kHz and 40µV_rms noise	Better for ultra-low-IQ systems where 3.3V is acceptable; less suitable for noise-critical analog rails	Select when lowest standby current dominates over noise/PSRR; verify 3.3V compatibility with load logic levels
Torex XC6206P332MR-G	3.3V output, 250mA limit, 1.0µA IQ, 60dB PSRR @ 1kHz, 45µV_rms noise, SOT-23-3 pinout identical	Superior IQ for multi-year battery life; trade-off is higher noise and lower PSRR than AP2120N-3.2TRG1	Prefer for energy-harvesting or coin-cell applications; avoid where sensor/RF noise floor is critical

Compared with MCP1700T-3302E/TT and XC6206P332MR-G, the AP2120N-3.2TRG1 uniquely balances 30µV_rms noise, 65dB PSRR, and 25µA IQ in a 3.2V option-making it optimal for portable imaging and precision sensing where both noise and efficiency matter.

Availability

AP2120N-3.2TRG1 is available at Aetrix Electronics and suitable for mobile phone subsystem power, wireless sensor node core rails, digital camera image sensor bias, and portable medical diagnostic modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP2120N-3.2TRG1 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 solutions, with design, manufacturing, and distribution infrastructure serving industrial, computing, consumer, and communications markets.

The AP2120 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and minimal quiescent current in compact SOT-23 packages.

FAQ

What is the minimum input voltage required for AP2120N-3.2TRG1 to maintain regulation?

The AP2120N-3.2TRG1 requires a minimum input voltage of 2.0V per its Recommended Operating Conditions. However, to sustain 3.2V output under load, VIN must exceed VOUT plus dropout voltage - e.g., ≥3.4V for 100mA output given 200mV typical dropout. Below that, output voltage drops linearly with input.

Can AP2120N-3.2TRG1 be used with ceramic capacitors smaller than 1µF?

No - the datasheet specifies a minimum 1µF ceramic output capacitor (with ESR between 0.01Ω and 100Ω) for stability. Using smaller values risks oscillation or poor transient response. Input also requires ≥1µF ceramic; deviation may cause startup failure or increased ripple.

Is AP2120N-3.2TRG1 qualified for automotive applications?

No - AP2120N-3.2TRG1 is rated for –40°C to +85°C operation and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7361Q) with PPAP capability and IATF 16949 manufacturing; this part is intended for industrial and consumer portable equipment only.

How does thermal performance scale in SOT-23 at 150mA output?

With θ_JA = 250°C/W and 300mV dropout at 150mA, power dissipation is 45mW. At 25°C ambient, junction temperature rise is ~11.3°C - well within the +150°C absolute max. Full derating applies above +85°C ambient; PCB copper area significantly improves real-world thermal margin.

AP2120N-3.2TRG1 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):: 3.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 150mA

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-3.2TRG1 FAQ

1.How can I place an order for AP2120N-3.2TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2120N-3.2TRG1 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-3.2TRG1 reliable?

The price and inventory of AP2120N-3.2TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2120N-3.2TRG1 is usually 5 days.

3.What payment methods are accepted for AP2120N-3.2TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2120N-3.2TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2120N-3.2TRG1?

AP2120N-3.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2120N-3.2TRG1 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-3.2TRG1?

For technical support, including AP2120N-3.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2120N-3.2TRG1 requirements.

6.How does Aetrix verify that AP2120N-3.2TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2120N-3.2TRG1 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-3.2TRG1 meets industry standards.

7.What is the process for return or replacement of AP2120N-3.2TRG1?

All AP2120N-3.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2120N-3.2TRG1, 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-3.2TRG1 part is unused and in its original packaging.

Return procedure for AP2120N-3.2TRG1:

1.Submit a request within 90 days.

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

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