ON Semiconductor’s CAT4101 – End of Life, Discontinued

Around 2010, ON Semiconductor introduced the world to the CAT4101 family of LED drivers. Sadly, the sands of time leave no one untouched – which is why we must channel Steve Jobs while mourning the death of our beloved friend, CAT4101TV-T75.

As shown in the figure, the CAT4101 was a relatively simple constant current shunt regulator. This meant that its efficiency was limited, but that no inductors were needed – without switching action, there are no LED bulb EMI concerns to worry about.

Using the part to drive a set of LEDs could not be easier. Our figure shows an example where a set of LEDs is driven by a CAT4101TV-T75 with a guaranteed current of 1A. The main issue is that a regulated 5V supply is needed to power the logic, while a second supply with higher voltage is required to actually keep the LEDs happy. The resistor shown on the right-hand side, then, is used to determine the LED current desired.

Driving LEDs with constant current is not difficult

ON Semiconductor apparently planned to offer an entire product line for LED driving; its life, sadly, seems to have been cut short. Thus, no in-house replacement will be provided for the end-of-life CAT4101 – other vendors do, however, offer similar components.

While the part is no longer being produced by ON Semiconductor, there still is quite a bit of stock to be had. Use OEMSecrets to find CAT4101TV distributors, and stock up in a last-time-buying frenzy to keep units in the field!

Recent Articles
STSPIN32F0 – Series
Extremely integrated STM32-based system-in-package solution for driving three-phase BLDC motors We would like to introduce you to ST’s growing portfolio of STSPIN32F0 devices. Embedding a 32-bit ARM... Read Article
Enter for your chance to win a Digilent Dev Board worth over $500
To celebrate our 10 Year Anniversary this month and to thank everyone for their support over the last decade, we’ve partnered with Digilent to give away 2x Digilent development boards... Read Article
Efficient High-Power Gallium Nitride FETs from Nexperia
Whether designing a motor drive/controller for the next generation of battery-electric vehicles, or a power supply for the latest 5G telecommunication networks, Nexperia’s GaN FETs will be key... Read Article
Debug your embedded systems from the home office
Use USB Logic Analyzer and Pattern Generator to debug, visualize, and simulate signals in digital systems The quarantines are forcing an increasing number of engineers and... Read Article
Learn more about Optocoupler Design for EMI Immunity by Broadcom & EBV
Join the IEEE Webinar on 26th May, 4pm CET – Optocoupler Design for EMI Immunity Also available on demand This webinar takes a close look into... Read Article
6 use cases for adaptable technology and its impact on automotive trends
Overcome technological complexity in automotive design with Xilinx and Avnet Silica The automotive industry is a highly competitive space. In the blink of an eye, a... Read Article