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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

Diodes Incorporated AP4340SNTR-G1

Name: AP4340SNTR-G1
Brand: Diodes Incorporated
SKU: AP4340SNTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP4340SNTR-G1

Manufacturer:: Diodes Incorporated

Category:: Power Management - Specialized

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

Datasheet:: AP4340SNTR-G1.pdf

Description:: IC ACDC PSR ACCEL SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,965

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Product details

Overview

AP4340SNTR-G1 from Diodes Incorporated is a dynamic primary-side regulation (PSR) accelerator IC designed for 5V-output flyback chargers and adapters. It functions as an output voltage detector with fast wake-up signaling, featuring 4.73V trigger voltage, 5.3V discharge voltage, 2.2mA discharge current, and operates in SOT23 package with 15μA typical operating current.

For engineers reviewing the AP4340SNTR-G1 datasheet, AP4340SNTR-G1 pinout, AP4340SNTR-G1 application, or AP4340SNTR-G1 equivalent, key selection criteria include secondary-side voltage detection threshold accuracy, low-quiescent-current wake-up signaling capability, transformer-coupled control interface compatibility, and green-mode standby power optimization.

Technical Context

The AP4340SNTR-G1 implements a comparator-based voltage detection architecture that monitors secondary-side output voltage via auxiliary winding feedback. It generates periodic wake-up pulses when V_OUT falls below 4.73V and activates a 2.2mA discharge path when V_OUT exceeds 5.3V.

Its 3.1V power-on threshold and 5μA startup current enable reliable operation under light-load conditions. The device interfaces directly with PSR controllers such as AP3306 or AP3308, eliminating optocoupler and TL431 in conventional feedback loops.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Max	5.5V - Absolute maximum supply voltage; defines upper limit of auxiliary winding bias rail.
Power-on Voltage	3.1V - Minimum V_CC required to initiate internal circuitry; ensures stable start-up at low auxiliary voltage.
Trigger Voltage	4.73V - Output voltage threshold below which wake-up pulses are generated; sets 5V system undervoltage detection point.
Discharge Voltage	5.3V - Output voltage threshold above which 2.2mA discharge path activates; prevents overvoltage during transient recovery.
Operating Current	15μA - Typical quiescent current during active monitoring; enables sub-30mW standby power compliance.
V_OVP	5.78V - Overvoltage protection trip point; provides secondary-side fault safeguard independent of primary controller.
Package	SOT23 - 3-pin surface-mount package; supports high-density PCB layout and automated assembly.

Pinout & Package

SOT23-3 package with gull-wing leads, 1.3mm pitch, and thermal pad not present. Standard pin assignment verified per Diodes Inc. datasheet AP4340S.pdf (Rev. 001, April 2015).

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Supply input	Bias voltage sourced from transformer auxiliary winding; powers internal comparator and logic.
GND	Ground reference	Common return path for internal circuitry and discharge current sink.
OUT	Open-drain output	Drives transformer-coupled wake-up signal or discharge path; requires external pull-up on primary side.

Key Features

Feature	Design Value
No external components required	Integrates precision voltage reference, comparator, and discharge transistor - eliminates discrete TL431 + optocoupler feedback network.
Low standby power support	15μA operating current enables <30mW no-load power consumption in 5V/1A charger designs.
Fast transient response	Sub-10μs wake-up pulse generation upon output droop improves PSR load-step recovery by >40% vs. conventional solutions.
Integrated overvoltage protection	5.78V V_OVP with 170mA current limit provides autonomous secondary-side fault shutdown without primary controller intervention.

Applications

Smartphone Charger

USB-C Wall Adapter

Use Scenario: 5V/1A flyback charger operating in deep-sleep mode between device charging cycles.

IC Role / Device Role / Timing Role: Secondary-side voltage detector and wake-up signal generator coupled via transformer to primary controller.

Use Value: Reduces no-load power to <25mW while maintaining <100ms wake-up latency after load connection.

Use Scenario: Compact 5V USB-C adapter requiring rapid load detection and minimal BOM count.

IC Role / Device Role / Timing Role: Standalone PSR accelerator enabling optocoupler-free feedback with precise 4.73V undervoltage trigger.

Use Value: Eliminates 4–5 passive components and reduces PCB area by 12mm² versus TL431+opto solution.

Wireless Earbud Case Charger

IoT Sensor Power Supply

Use Scenario: Low-power charging circuit for TWS earbud case with intermittent 5V load demand.

IC Role / Device Role / Timing Role: Secondary-side voltage monitor triggering primary controller wake-up only when battery voltage drops below 4.73V.

Use Value: Extends system standby time by suppressing unnecessary primary-side switching during idle periods.

Use Scenario: Always-on 5V power supply for battery-backed environmental sensor node.

IC Role / Device Role / Timing Role: Autonomous overvoltage protector (5.78V trip) and discharge initiator (5.3V threshold) for secondary winding.

Use Value: Prevents capacitor over-stress during line surges without relying on primary-side OVP response time.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSR acceleration applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP4330SNTR-G1	Higher 5.0V trigger voltage; 20μA operating current; no integrated discharge function.	Limited to wake-up-only use cases; requires external discharge circuit for overvoltage handling.	Select when only undervoltage wake-up is needed and board space permits external MOSFET discharge path.
UCC28911DR	Integrated primary-side controller with PSR; 700V HV start-up; no secondary-side voltage sensing.	Replaces entire primary controller + feedback chain; not a drop-in replacement for AP4340S.	Choose for new designs where full PSR integration is preferred over hybrid primary/secondary architecture.

Compared with AP4340SNTR-G1, AP4330SNTR-G1 lacks discharge capability and has higher trigger voltage, limiting its use in tight 5V regulation; UCC28911DR shifts control entirely to primary side, removing secondary sensing but increasing design complexity for legacy PSR systems.

Availability

AP4340SNTR-G1 is available at Aetrix Electronics and suitable for smartphone chargers, USB-C wall adapters, and wireless earbud case power supplies requiring stable component supply and green-mode compliance.

Supply support for AP4340SNTR-G1 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, with design centers across Asia and manufacturing facilities in China, Taiwan, and the US.

The AP4340S belongs to Diodes' PSR Accelerator product line, engineered specifically to replace optocoupler-based feedback in low-power AC/DC adapters and improve transient response in 5V-output flyback topologies.

FAQ

What is the function of the OUT pin on AP4340SNTR-G1?

The OUT pin is an open-drain output that drives transformer-coupled wake-up signals to the primary-side controller when output voltage drops below 4.73V, and simultaneously sinks 2.2mA to discharge the output capacitor when voltage exceeds 5.3V. It requires an external pull-up resistor on the primary side for proper signal coupling.

Can AP4340SNTR-G1 operate without an auxiliary winding?

No. The AP4340SNTR-G1 requires a dedicated auxiliary winding to supply its V_CC pin with regulated bias voltage. It cannot derive power from the main output or primary-side HV rail. The auxiliary winding must deliver ≥3.1V to ensure reliable power-on and continuous monitoring.

How does AP4340SNTR-G1 reduce no-load power consumption?

By drawing only 15μA operating current and eliminating the 1–2mA quiescent current of a TL431 + optocoupler feedback network, the AP4340SNTR-G1 reduces total secondary-side bias loss. This enables compliant <30mW no-load power in 5V/1A chargers meeting DOE Level VI and CoC Tier 2 standards.

Is AP4340SNTR-G1 compatible with all primary-side controllers?

It is validated with Diodes' AP3306 and AP3308 PSR controllers, and functionally compatible with any primary controller accepting transformer-coupled wake-up pulses and supporting external discharge signaling. Timing parameters (pulse width, frequency) must be verified against the target controller's wake-up sensitivity specification.

AP4340SNTR-G1 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

Applications:: PSR Accelerator

Current - Supply:: 240µA

Voltage - Supply:: 4V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AP4340SNTR-G1 FAQ

1.How can I place an order for AP4340SNTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP4340SNTR-G1 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 AP4340SNTR-G1 reliable?

The price and inventory of AP4340SNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP4340SNTR-G1 is usually 5 days.

3.What payment methods are accepted for AP4340SNTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP4340SNTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP4340SNTR-G1?

AP4340SNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP4340SNTR-G1 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 AP4340SNTR-G1?

For technical support, including AP4340SNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP4340SNTR-G1 requirements.

6.How does Aetrix verify that AP4340SNTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP4340SNTR-G1 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 AP4340SNTR-G1 meets industry standards.

7.What is the process for return or replacement of AP4340SNTR-G1?

All AP4340SNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP4340SNTR-G1, 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 AP4340SNTR-G1 part is unused and in its original packaging.

Return procedure for AP4340SNTR-G1:

1.Submit a request within 90 days.

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

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