What is FSQ321LX?
FSQ321LX is a PMIC - AC DC Converters, Offline Switchers component from ON Semiconductor. This product page summarizes the core sourcing details buyers need before checking price, availability, documentation, or samples.
Supply original FSQ321LX, PMIC - AC DC Converters, Offline Switchers, by ON Semiconductor
IC SWIT PWM GREEN OVP UVLO 8LSOP
RoHS
Datasheet
Pictures are for reference only. Please contact us for the latest pictures.
Key specifications
Serise
FPS™
Min Quantity
1
Category
Integrated Circuits (ICs)Sub Categroy
PMIC - AC DC Converters, Offline SwitchersDescription
IC SWIT PWM GREEN OVP UVLO 8LSOP
key Attributes
-
Technical document
Open The Official Datasheet
Review the latest datasheet for FSQ321LX from ON Semiconductor in a separate tab so engineers and buyers can check package, electrical characteristics, and application details without leaving this product page.
Why request a quote
Use the RFQ step to confirm the commercial and documentation details buyers usually need before placing an order.
Confirm stock and lead-time expectations
Check CoC or traceability support
Align inspection and fulfillment details
Trust signals
Globally recognized certifications
Visible certifications work best when they are paired with clear operational promises around traceability, handling, and inspection.
ISO 9001
Quality management processes for more consistent sourcing and handling.
AS9120B
Aerospace-focused distribution controls for traceability and reliability.
ISO 14001
Environmental management discipline across warehouse and operating workflows.
ESD Control
Electrostatic handling standards to help protect sensitive components.
Authenticity Verification
CoC Available on Request
Pre-Shipment Inspection
Responsive RFQ Support
Why buyers trust this sourcing flow
Our quality workflow is designed to reduce counterfeit risk and support confident procurement. Components are reviewed through documented handling and inspection steps so buyers can evaluate sourcing with stronger authenticity controls.
Structured product content
Review The Product The Way Buyers Actually Evaluate It
Jump between overview, specs, and related sourcing content without scanning one long uninterrupted page.
Product overview
Overview
DescriptionA Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency.
The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components.
The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry.
Features
• Optimized for Valley Switching Converter (VSC)
• Low EMI through Variable Frequency Control and Inherent Frequency Modulation
• High Efficiency through Minimum Voltage Switching
• Narrow Frequency Variation Range Over Wide Load and Input Voltage Variation
• Advanced Burst-Mode Operation for Low Standby Power Consumption
• Pulse-by-Pulse Current Limit
• Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal OverCurrent Protection (AOCP), Internal
Thermal Shutdown (TSD)
• Under-Voltage Lockout (UVLO) with Hysteresis
• Internal Startup Circuit
• Internal High-Voltage SenseFET: 650V
• Built-in Soft-Start: 15msApplications
• Power Supplies for DVP Player, DVD Recorder, Set-Top Box
• Adapter
• Auxiliary Power Supply for PC, LCD TV, and PDP TV
The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components.
The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry.
Features
• Optimized for Valley Switching Converter (VSC)
• Low EMI through Variable Frequency Control and Inherent Frequency Modulation
• High Efficiency through Minimum Voltage Switching
• Narrow Frequency Variation Range Over Wide Load and Input Voltage Variation
• Advanced Burst-Mode Operation for Low Standby Power Consumption
• Pulse-by-Pulse Current Limit
• Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal OverCurrent Protection (AOCP), Internal
Thermal Shutdown (TSD)
• Under-Voltage Lockout (UVLO) with Hysteresis
• Internal Startup Circuit
• Internal High-Voltage SenseFET: 650V
• Built-in Soft-Start: 15msApplications
• Power Supplies for DVP Player, DVD Recorder, Set-Top Box
• Adapter
• Auxiliary Power Supply for PC, LCD TV, and PDP TV
Full technical breakdown
Detailed Specifications
Review grouped attributes and parameters without scanning one oversized table.
Fast scan
Popular Specs Surfaced First
Product Attribute
Part Status
Active
Product Attribute
REACH Status
REACH Unaffected
Product Attribute
ECCN
EAR99
Product Attribute
Lifecycle Status
ACTIVE (Last Updated: 2 days ago)
Product Attribute
Mounting Type
Surface Mount
Product Attribute
Factory Lead Time
13 Weeks
Part Status
Active
REACH Status
REACH Unaffected
ECCN
EAR99
Lifecycle Status
ACTIVE (Last Updated: 2 days ago)
Mounting Type
Surface Mount
Factory Lead Time
13 Weeks
Packaging
Tape & Reel (TR)
Categories
Integrated Circuits (ICs)
Terminal Position
DUAL
Qualification Status
Not Qualified
Published
2015
Operating Temperature
-40°C~85°C TA
Peak Reflow Temperature (Cel)
250
Manufacturer
ON Semiconductor
Subcategory
Switching Regulator or Controllers
Series
FPS™
Sub-Categories
PMIC - AC DC Converters, Offline Switchers
Power Dissipation
1.5W
Resistance
19Ohm
Package / Case
8-SMD, Gull Wing
Weight
710mg
Base Part Number
FSQ321
Number Of Functions
1
Nominal Supply Current
3mA
Mount
Surface Mount
Pbfree Code
yes
Number Of Outputs
1
Number Of Pins
8
Number Of Terminations
8
Reflow Temperature-Max (S)
NOT SPECIFIED
Terminal Pitch
2.54mm
Max Power Dissipation
1.5W
Output Current
500mA
Operating Supply Voltage
13V
Max Supply Current
5mA
Width
6.4mm
Length
9.2mm
Manufacturer'S Part No.
FSQ321LX
Output Power
12W
Height Seated (Max)
3.7mm
JESD-609 Code
e3
Moisture Sensitivity Level (MSL)
1 (Unlimited)
RoHS Status
ROHS3 Compliant
REACH SVHC
No SVHC
HTSUS
8542.39.0001
ECCN Code
EAR99
Terminal Finish
Tin (Sn)
Output Isolation
Isolated
Control Mode
CURRENT-MODE
Control Technique
PULSE WIDTH MODULATION
Topology
Flyback
Fault Protection
Current Limiting, Over Load, Over Temperature, Over Voltage
Control Features
Sync
Analog IC - Other Type
SWITCHING REGULATOR
Voltage - Supply (Vcc/Vdd)
8V~20V
Frequency - Switching
55kHz~67kHz
Max Output Power
10W
Max Duty Cycle
13.5 %
Input Voltage-Nom
15V
Switcher Configuration
SINGLE
Internal Switch(S)
Yes
Nominal Input Voltage
20V
Voltage - Start Up
12V
Min Breakdown Voltage
650V
Turn On Delay Time
7.77 μs
Common questions
Product FAQ
Quick answers for buyers reviewing FSQ321LX, stock, documentation, and sourcing steps.
What package and description are listed for FSQ321LX?
FSQ321LX is listed with package reference -. The current product description is IC SWIT PWM GREEN OVP UVLO 8LSOP, and buyers should confirm package, footprint, and electrical details against the datasheet or quotation notes before approval.
Is FSQ321LX available in stock?
This page currently shows 99471 units in stock and 17744 units available for FSQ321LX. Because electronic component availability can change quickly, submit an RFQ to confirm live stock, lead time, and final pricing.
Can I request a quote or sample for FSQ321LX?
Yes. Use the Quick Quote or Request Sample action on this page to send the quantity and sourcing requirements for FSQ321LX by ON Semiconductor. The TrustCompo team can review price, availability, and documentation support.
Is a datasheet available for FSQ321LX?
Yes. This page links to the datasheet for FSQ321LX by ON Semiconductor, so engineers and buyers can review package, ratings, and application details before purchase.
How should buyers verify FSQ321LX before ordering?
Buyers should confirm the manufacturer, package, quantity, target price, RoHS or compliance needs, and any Certificate of Conformance or traceability requirements for FSQ321LX before approving the order.
PMIC - AC DC Converters, Offline Switchers
Recommended Products
Explore more parts from the same subcategory to compare fit, stock, and sourcing options.
FSQ321L
180 purchased
RoHS
Datasheet
IC SWIT PWM GREEN OVP UVLO 8LSOP
Reference price
$0.54Add to RFQ list
FSL106MR
128 purchased
DIP
RoHS
Datasheet
IC PWM/SENSEFET SMPS 0.5A 8-DIP
Reference price
$0.38Add to RFQ list
FSQ0270RNA
215 purchased
DIP
RoHS
Datasheet
IC SWIT PWM GREEN OVP UVLO 8DIP
Reference price
$1.52Add to RFQ list
FSQ0765RQWDTU
186 purchased
TO-220-6
RoHS
Datasheet
IC SWIT PWM GREEN UVLO TO220F
Reference price
$1.50Add to RFQ list
NCP1075P065G
179 purchased
DIP
RoHS
Datasheet
IC REG SWITCHING HV SMPS 7DIP
Reference price
$0.90Add to RFQ list
More sourcing insights
Articles
Jun 29, 2026
Wolfspeed SiC supply continuity 2026: a buyer's framework for second-source qualification
wolfspeedsicsupply-continuitysecond-source
How Wolfspeed's 2026 SiC supply story changes procurement decisions — what to lock-buy, where to qualify a second source, and the MPN-level continuity boundaries that actually matter.
Jun 25, 2026
MOSFET Selection Guide for Power Design: A Buyer's Framework for Voltage Class, Losses, Package, and Sourcing Risk
MOSFETpower designselection guideTO-220
A practical MOSFET selection guide for power design teams covering voltage class, Rds(on), gate charge, package thermal limits, and sourcing-safe alternative logic.
Jun 19, 2026
Vishay, Onsemi & Infineon 2026 MOSFET Shortage — A Buyer's Framework
mosfetshortageallocationpower-semiconductor
2026 Vishay, Onsemi and Infineon power MOSFET shortage buyer framework: part-family risk matrix, datasheet-verified alternatives, and three procurement actions to act on before Infineon's July price increase.