Taiwan Semiconductor CMOS LED IC is Drop-in Replacement for Legacy Bipolar Drivers

Aug. 20, 2020
Linear constant-current CMOS driver IC is direct socket replacement for bipolar components; delivers improved performance at comparable cost.

Brea, CA.— August 20, 2020 —Taiwan Semiconductor, a global supplier of discrete power electronics devices, LED drivers, analog ICs and ESD protection devices, announces the availability of the TSCR4 family of linear CMOS LED driver ICs, providing a much improved  performance drop-in replacement for legacy bipolar drivers. These constant current drivers provide stable LED current over a wide range of conditions including source voltage variations, changes in load or temperature variations. Compared to legacy bipolar LED drivers, the TSCR4 family offers higher current setpoint accuracy and stability, lower quiescent current, tighter output compliance voltage and improved temperature coefficient. These ICs enable upgrades of existing designs for higher performance with no re-design effort required.

The TSCR4 family of linear constant current LED drivers offers designers a number of benefits and improvements over competing bipolar devices:

·        Higher accuracy of output current.  Improves manufacturing yields in mass production.

·         Lower quiescent current (e.g., 300ma vs 1A @ 24 VDC). Lowers power dissipation and reduces battery standby and operating power consumption.

·         More precise output voltage drop. CMOS control of voltage drop enables operation closer to the rail.

·         Higher stability of output current. Delivers consistent brightness control and extends LED life. 

·         Better temperature coefficient (-0.07%/ C). Controls output current with temperature increases to eliminate risk of thermal runaway.

·         AEC-Q100 parts available. Ideal for many basic automotive lighting applications.

·         PWM dimming. Up to 10KHz digital input for 0 to 100% dimming (TSCR421CX6/H).

·         Supply voltage up to 40V. Supports large LED arrays.

·         Easy parallel driver structure.

The TSCR4 family of LED driver ICs is the perfect part to upgrade a legacy design,” reported Sam Wang, Vice President, TSC Products. “The features and performance of these devices at an affordable price point make them an excellent candidate for new designs, as well.”

Applications include automobile, truck and bus interior and exterior lighting, architectural lighting, signage, advertising and decorative lighting, lighting in refrigerators, freezer cases, kiosks and vending machines, emergency lighting (EXIT signs, stairstep and emergency exit pathway lighting systems).

Design resources include a comprehensive datasheet and interactive designer worksheet.



Price (OEM Quantities): AEC-Q100 version – from $0.46 / General Purpose - from $0.31

Lead Time: Samples in-stock (Digi-Key and Mouser)

About Taiwan Semiconductor (TSC).

Recognized for more than 40 years for its core competence in discrete power rectifiers, Taiwan Semiconductor’s expanded product portfolio provides a complete solution from one source: including trench Schottky’s, MOSFETs, power transistors, LED driver ICs, analog ICs and ESD protection devices. A global enterprise with 2,000 over employees, TSC’s production facilities in China and Taiwan are fully compliant with current automotive and environmental standards such as IATF16949, ISO9001 and ISO14001. Taiwan Semiconductor products are used in a vast array of applications in the electronics industry including automotive, computer, consumer, industrial, telecom and photovoltaic. Through strategic expansion of innovative manufacturing capabilities and its focus on pioneering efficient semiconductor solutions, TSC is the right choice for a successful and lasting business relationship.


Kevin Parmenter, Director, Applications Engineering

TSC America, Inc.



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