What are the key applications for the AP3981C?

It is primarily used in battery chargers, network adapters, routers, and set-top box power supplies.

Does the AP3981C require an opto-coupler?

No, it uses primary-side regulation to achieve constant voltage and constant current without an opto-coupler.

What protection features are included?

It includes VCC over-voltage, output over-voltage/under-voltage, output short-circuit, cycle-by-cycle current limit, and over-temperature protection.

What is the pinout of AP3981CS-13?

Use the AP3981CS-13 datasheet for the official pinout diagram and pin names. In PartGenie, ask Datasheet AI about AP3981CS-13 pinout to locate pins, power rails, and interface signals before layout.

AP3981CS-13 Datasheet, Specs, Alternatives & ECAD | Diodes Incorporated

AI summary

The AP3981C is a primary-side regulated AC-DC power switcher with an integrated 650V MOSFET, ideal for compact, opto-coupler-free power supplies.

Best for

Compact AC-DC adapters
Cost-sensitive power supplies

Avoid if

Applications requiring secondary-side feedback
High-power designs exceeding MOSFET limits

Check before use

Auxiliary winding design
Line compensation resistor values

Key specifications

Max MOSFET Voltage: 650 V
Package: SO-8
Topology: Flyback (DCM)
No-Load Power: 75 mW

Compliance & Environment

RoHS: ROHS3 Compliant
REACH: -
MSL: -
ECCN: -
HTSUS: -

Application

Power SuppliesConsumer Electronics

Datasheet

DIOD-S-A0008524292-1.pdf

800 KB

Datasheet AI

CAD Models

Download ECAD models for AP3981CS-13: KiCad symbol & footprint, Altium footprint, PCB footprint, and 3D model.

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Where to Buy

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Alternative components

Alternatives are being enriched. Analyze this part in PartGenie for the latest matches.

Design and risk insights

Questions & answers

It is a high-performance power switcher integrating a primary-side regulation controller and a 650V N-channel MOSFET.

AI summary

Best for

Avoid if

Check before use

Key specifications

Compliance & Environment

Application

Datasheet

CAD Models

Where to Buy

Alternative components

Design and risk insights

Questions & answers

What is the AP3981C?+×

What are the key applications for the AP3981C?+×

Does the AP3981C require an opto-coupler?+×

What protection features are included?+×

What is the pinout of AP3981CS-13?+×