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

Diodes Incorporated AP131-20WG-7

Name: AP131-20WG-7
Brand: Diodes Incorporated
SKU: AP131-20WG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP131-20WG-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP131-20WG-7.pdf

Description:: IC REG LINEAR 2V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

AP131-20WG-7 from Diodes Incorporated is a 300mA fixed-output (2.0V) low-dropout linear regulator in SOT25 package, featuring 400mV dropout at full load, 50µA quiescent current, and active-low enable control. It integrates current limit, thermal shutdown, and bandgap reference with BP pin for noise reduction-designed for battery-powered wireless modules and PC peripherals requiring stable low-voltage supply.

For engineers reviewing the AP131-20WG-7 datasheet, AP131-20WG-7 pinout, AP131-20WG-7 application, or AP131-20WG-7 equivalent, key selection criteria include dropout voltage at 300mA, ±2% output accuracy over temperature, EN pin logic thresholds, BP capacitor noise filtering capability, and SOT25 thermal resistance (θ_JA = 163°C/W).

Technical Context

The AP131-20WG-7 employs a PMOS pass element with internal 1.5Ω R_ON, enabling low dropout and zero base current draw. Its error amplifier compares feedback from the bandgap reference to regulate output precisely across line (0.1%/V) and load (30mV) variations.

Enable functionality uses TTL-compatible thresholds: V_ENON ≥ 1.5V and V_ENOFF ≤ 0.8V, with <8µs delay when CBP = 0.1µF. PSRR reaches 60dB at 100Hz, and short-circuit fold-back limits peak current to 150–300mA under fault conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.0V ±2% accuracy ensures stable core voltage for 2.0V I/O domains in microcontrollers and sensors.
Dropout Voltage	400mV typ. at 300mA enables operation down to 2.4V input-critical for single-cell Li-ion or two-cell alkaline systems.
Quiescent Current	50µA typ. at no load minimizes standby power loss in always-on battery devices like IoT endpoints.
Enable Threshold	V_ENON ≥ 1.5V / V_ENOFF ≤ 0.8V allows direct interfacing with 1.8V/3.3V GPIO without level-shifting.
PSRR	60dB at 100Hz suppresses switching noise from upstream DC-DC converters feeding the LDO input.
Thermal Shutdown	Activates at T_J > +125°C with hysteresis, protecting against sustained overload in enclosed enclosures.

Pinout & Package

SOT25 (5-pin, lead-free, halogen-free "Green" package) with 163°C/W junction-to-ambient thermal resistance on standard FR-4 PCB layout.

Pin/Terminal	Circuit Role	Design Meaning
1: IN	Input voltage supply	Accepts 2.7–5.5V; requires 1µF ceramic input capacitor for stability and transient response.
2: EN	Active-low enable control	Pulled high internally via weak current source; drives low to disable regulator and reduce ground current to 5µA.
3: BP	Bandgap reference bypass	Connects 0.1µF capacitor to reduce output noise and improve PSRR below 10kHz.
4: OUT	Regulated output	Delivers up to 300mA at 2.0V; requires 10µF ceramic output capacitor for load step stability.
5: GND	Power ground reference	Shared return path for IN, OUT, and BP; must be low-impedance connection to minimize regulation error.

Key Features

Feature	Design Value
Low-quiescent-current operation	50µA IQ enables >1-year battery life in 10µA average-load IoT sensors powered by CR2032.
Fast transient response	Stabilizes within 10µs after 100mA load step-maintains <1% output deviation during MCU wake-up bursts.
Integrated protection	Current limit (350–450mA) and thermal shutdown prevent latch-up or permanent damage during short-circuit events.
BP pin noise filtering	0.1µF capacitor on BP reduces output voltage noise by 20dB, critical for ADC reference or RF bias rails.

Applications

Wireless Sensor Node

USB Peripheral IC Supply

Use Scenario: Sub-GHz or BLE sensor node powered by coin cell with intermittent 300mA transmit bursts.

IC Role / Device Role / Timing Role: Primary 2.0V supply for RF transceiver and microcontroller core logic.

Use Value: 400mV dropout extends usable battery range by 12% compared to 600mV-drop alternatives at end-of-life voltage.

Use Scenario: USB 2.0 hub controller requiring clean 2.0V I/O rail decoupled from noisy 3.3V VBUS-derived supply.

IC Role / Device Role / Timing Role: Local point-of-load regulator isolating sensitive USB PHY timing circuitry from digital noise.

Use Value: 60dB PSRR at 100Hz attenuates 500mVpp VBUS ripple to <1mVpp on 2.0V rail-meeting USB electrical compliance.

Laptop Card Reader

Industrial PLC I/O Module

Use Scenario: SD card interface on ultrabook motherboard where space-constrained layout demands minimal external components.

IC Role / Device Role / Timing Role: Fixed 2.0V supply for SD card controller logic and level translators.

Use Value: SOT25 footprint (3.0 × 1.6mm) fits tight routing zones; ±2% accuracy ensures reliable SD command timing margins.

Use Scenario: DIN-rail mounted PLC module operating in -40°C to +85°C ambient with 24V DC input.

IC Role / Device Role / Timing Role: Secondary 2.0V rail for isolated analog front-end signal conditioning ASICs.

Use Value: Thermal shutdown activation at 125°C prevents field failure during enclosure overheating; 163°C/W θ_JA verified per JEDEC JESD51-7.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-20SAG-7	Higher 500mA rating, 350mV dropout at 300mA, but larger SOT23-5 footprint and no BP pin.	Preferred for higher-current loads; lacks BP noise filtering-requires external RC filter for sensitive analog rails.	Select when >300mA peak current is required and board area permits larger package.
MCP1700T-2002E/TT	Same 2.0V output and SOT23-5 package, but 250mV dropout and 1.6µA quiescent current-lower IQ but lower current limit (250mA).	Better for ultra-low-power sleep modes; insufficient for 300mA continuous loads like RF transceivers.	Choose for energy-harvesting or multi-year battery designs where peak load never exceeds 250mA.

Compared with AP7343-20SAG-7 and MCP1700T-2002E/TT, the AP131-20WG-7 uniquely balances 300mA capability, 400mV dropout, 50µA IQ, and BP-based noise reduction in the compact SOT25 footprint-making it optimal for space-constrained, noise-sensitive 2.0V applications.

Availability

AP131-20WG-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripheral IC supplies, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability.

Supply support for AP131-20WG-7 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 analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The AP131 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications demanding low dropout, low IQ, and integrated protection in miniature packages.

FAQ

What is the minimum input voltage required for AP131-20WG-7 to maintain 2.0V output at 300mA?

The minimum input is 2.4V, calculated as V_OUT + V_DROP = 2.0V + 0.4V. Below this, regulation fails and output drops linearly. The device operates down to 2.7V input per datasheet min spec, ensuring margin for battery voltage sag during discharge.

Can the BP pin be left unconnected, and what impact does that have?

Yes, BP can be left floating, but doing so degrades PSRR by ~15dB below 10kHz and increases output noise by 3×. For RF or precision analog applications, a 0.1µF X7R capacitor to GND is mandatory to achieve specified 60dB PSRR and low-noise performance.

Is AP131-20WG-7 compatible with lead-free reflow profiles?

Yes-it is fully RoHS 3 compliant (2015/863/EU), halogen- and antimony-free, and qualified for standard lead-free reflow with peak temperature up to 260°C per JEDEC J-STD-020. The SOT25 package uses matte tin plating compatible with Pb-free soldering processes.

Does the EN pin require an external pull-up resistor for proper startup?

No-EN has an internal weak pull-up (~10MΩ) that biases it high at power-on, enabling the regulator automatically. An external pull-down is only needed if controlled shutdown is required; otherwise, EN may be tied directly to VIN or left open for default-on operation.

AP131-20WG-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 100 µA

Current - Supply (Max):: -

PSRR:: 60dB (100Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP131-20WG-7 FAQ

1.How can I place an order for AP131-20WG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP131-20WG-7 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 AP131-20WG-7 reliable?

The price and inventory of AP131-20WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-20WG-7 is usually 5 days.

3.What payment methods are accepted for AP131-20WG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-20WG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP131-20WG-7?

AP131-20WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP131-20WG-7 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 AP131-20WG-7?

For technical support, including AP131-20WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-20WG-7 requirements.

6.How does Aetrix verify that AP131-20WG-7 is sourced from the original manufacturer or authorized distributors?

All AP131-20WG-7 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 AP131-20WG-7 meets industry standards.

7.What is the process for return or replacement of AP131-20WG-7?

All AP131-20WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-20WG-7, 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 AP131-20WG-7 part is unused and in its original packaging.

Return procedure for AP131-20WG-7:

1.Submit a request within 90 days.

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

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