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Home > Technology List > New LED Drivers from Taiwan Semiconductor -TSCR420CX6H and TSCR421CX6H

New LED Drivers from Taiwan Semiconductor -TSCR420CX6H and TSCR421CX6H

Update Time: 2019-12-20 16:32:50

New LED Drivers from Taiwan Semiconductor -TSCR420CX6H and TSCR421CX6H

Hello, friends, we always have endless curiosity, new things make us excited, still in the electronic components industry, we always pay attention to those new technology and new devices.

Today I will introduce you to the latest LED Drivers-TSCR420CX6H and TSCR421CX6H from Taiwan Semiconductor.

Taiwan Semiconductor augmented its existing TSCR4xx line of LED drivers with two new low-side constant current regulators for automotive LEDs.

TSC recently announced the availability of the TSCR420CX6H and the TSCR421CX6H. The AEC-Q100 qualified LED drivers regulate with a preset 10mA nominal current that can be adjusted up to 300 mA via an external resistor.

The description of TSCR420CX6H and TSCR421CX6H

The TSCR420 & TSCR421 are Low-Side Constant

Current Regulator (CCR) for linear LED driving.

The device regulates with a preset 10mA nominal that can

Be adjusted with an external resistor up to 300mA. It is

Designed for driving LEDs in strings and will reduce

Current at increasing temperatures to self-protect.

Operating as a series linear CCR for LED string

Current control, it can be used in multiple applications,

As long as the maximum supply voltage to the device Is <40V.

They are designed for driving LEDs in strings and will self-protect by reducing current at increasing temperatures, with a negative temperature coefficient of 0.07%/°C.

Typical Applications of TSCR420CX6H and TSCR421CX6H

● Automotive Lighting

● Architectural LED lighting, emergency lighting

● Signage, Advertising, Decorative Lighting

● Retail Lighting in Fridges and Vending Machines

Both devices are low side regulators, meaning that they attach electrically to ground, rather than to the VS Supply. The TSCR421CX6H can be pulse-width modulated (PWM) up to 10 kHz by a microcontroller for LED dimming.

If more than 300 mA needs to be sourced, these automotive LED drivers can be hooked up in parallel.

The features of TSCR420CX6H and TSCR421CX6H

● Continuous output current up to 300mA with an External resistor

● Very low enable current

● Easy paralleling of drivers to increase current

● Supply voltage up to 40V
● Digital PWM input up to 10kHz (TSCR421)
● Good temperature coefficient vs. output current
● Compliant to RoHS Directive 2011/65/EU and in
According to WEEE 2002/96/EC.

● Halogen-Free according to IEC 61249-2-21


Taiwan Semiconductor is an exceptionally large semiconductor foundry, and while these drivers offer unique elements, the competition displays a strong similarity in the parts numbers and specs.


• BCR42OU and BCR32OU for the TSCR420CX6H

The main difference between the two is that the BCR320U has a maximum supply voltage of 25V, and the BCR420U has a maximum supply voltage of 40V.

• BCR421U and BCR321U for the TSCR421CX6H

Digital PWM input frequency up to 10 kHz for dimming. Again, the main difference between the two is that the BCR321U has a maximum supply voltage of 25V, and the BCR421U has a maximum supply voltage of 40V.

Diodes Incorporated

• BCR420UW6Q for the TSCR420CX6H

VOUT up to –40V supply voltage.

• BCR421UW6Q for the TSCR421CX6H

Also VOUT up to –40V supply voltage. This device can be pulse-with modulated, like the TSCR421CX6H, with input frequency of up to 25 kHz for dimming.

TSCR420CX6H / TSCR421CX6H have six pins.

1 EN Enable for biasing transistor
2 OUT Regulated output current
3 OUT Regulated output current
4 GND Power ground
5 OUT Regulated output current

6 REXT External resistor for adjusting output current

Have you learned about TSCR420CX6H and TSCR421CX6H, please contact us if you have any issues about this article. We'll do our best to correct it.

Thank you for reading!


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