Support software
LOAD-SWITCH-FET-LOSS-CALC — Power Loss Calculation Tool for Load Switch
Quickly trade off size, cost and performance to select the optimal MOSFET based on application conditions.
Data sheet
A newer version of this product is available
Pin-for-pin with same functionality to the compared device
CSD18509Q5B
- Ultra-Low On Resistance
- Low Thermal Resistance
- Avalanche Rated
- Logic Level
- Pb Free Terminal Plating
- RoHS Compliant
- Halogen Free
- SON 5-mm × 6-mm Plastic Package
This 40 V, 1 mΩ, SON 5 x 6 NexFET™ power MOSFET has been designed to minimize losses in power conversion applications.
Technical documentation
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View all 10 | Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | CSD18509Q5B N-Channel NexFET Power MOSFETs datasheet (Rev. A) | PDF | HTML | 19 May 2017 |
| Application brief | Estimating Leakage Currents of Power MOSFETs | PDF | HTML | 31 Oct 2025 | |
| Application note | MOSFET Support and Training Tools (Rev. G) | PDF | HTML | 27 Oct 2025 | |
| Application note | Semiconductor and IC Package Thermal Metrics (Rev. D) | PDF | HTML | 25 Mar 2024 | |
| Application note | Using MOSFET Transient Thermal Impedance Curves In Your Design | PDF | HTML | 18 Dec 2023 | |
| Application note | QFN and SON PCB Attachment (Rev. C) | PDF | HTML | 06 Dec 2023 | |
| Application note | Using MOSFET Safe Operating Area Curves in Your Design | PDF | HTML | 13 Mar 2023 | |
| Application brief | Tips for Successfully Paralleling Power MOSFETs | PDF | HTML | 31 May 2022 | |
| Technical article | Motor Drive forum top FAQs: 3 methods to prevent electrical overstress | PDF | HTML | 21 Dec 2015 | |
| Application note | Ringing Reduction Techniques for NexFET High Performance MOSFETs | 16 Nov 2011 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Support software
NONSYNC-BOOST-FET-LOSS-CALC — NONSYNC BOOST FET LOSS Calculator
MOSFET power loss calculator for non-synchronous boost converter
Supported products & hardware
Calculation tool
FET-SOA-CALC-SELECT — MOSFET SOA calculation and selection tool
Excel based FET SOA calculation and selection tool
Supported products & hardware
Calculation tool
MOTOR-DRIVE-FET-LOSS-CALC — Power Loss Calculation Tool for BLDC Motor Drive
This is an Excel-based MOSFET power loss calculator for brushless DC motor drive applications.
Supported products & hardware
Calculation tool
SLPR053 — Power Loss Calculation Tool for Synchronous Inverting Buck Boost Converter
MOSFET power loss calculation and selection tool for synchronous inverting buck boost converter
Supported products & hardware
Calculation tool
SYNC-BOOST-FET-LOSS-CALC — Power Loss Calculation Tool for Synchronous Boost Converter
MOSFET power loss calculator for synchronous boost converter applications.
Supported products & hardware
Calculation tool
SYNC-BUCK-FET-LOSS-CALC — Power Loss Calculation Tool for Synchronous Buck Converter
Quickly trade off size, cost and performance to select the optimal MOSFET based on application conditions.
Supported products & hardware
Calculation tool
SYNC-RECT-FET-LOSS-CALC — Power loss calculation tool for synchronous rectifier
MOSFET power loss calculator for synchronous rectifier applications
Reference designs
PMP4403 — USB Type-C DFP Charger 5V3A SSR Control Adapter Reference Design
The PMP4403 is an AC in 5V 3A reference design for USB Type-C™ DFP charger applications. It also is compliant with BC 1.2 devices. The solution is a synchronous rectified QR flyback which uses the UCC28740 and UCC24636. Good regulation and dynamic performance is achieved by using a secondary (...)
Reference designs
PMP4466 — Universal AC Input to 5V 3A Output Reference Design DOE6 and CoC V5 Tier 2 Compliant
The PMP4466 is an AC input to 5V 3A output reference design for high current charger applications, such as USB Type-C. The topology is Synchronous Rectified valley switched DCM Flyback which uses the UCC28740 and UCC24636. Good regulation and dynamic performance is achieved by using the secondary (...)
Reference designs
PMP10974 — Universal AC Input 5V/10A/50W PSR Flyback Power Supply With Over 89% Avg Efficiency Reference Design
PMP10974 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 89% average (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSON-CLIP (DNK) | 8 | Ultra Librarian |
Ordering & quality
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