TLC5940RHB

Overview

The TLC5940RHB is a 16-channel constant-current sink LED driver manufactured by Texas Instruments. It features individually adjustable 4096-step grayscale PWM brightness control for each channel and includes built-in dot correction to ensure uniform LED intensity. The device operates within a supply voltage range of 3 V to 5.5 V and supports output currents up to 120 mA per channel. It is housed in a 32-pin VQFN package with an operating temperature range from -40°C to +85°C.

Feature Summary

• Provides 16 independent channels for driving LEDs with constant-current sinking capability
• Integrates 12-bit (4096-step) grayscale PWM control for precise individual brightness adjustment
• Includes on-chip EEPROM-based dot correction to compensate for manufacturing variations

Applications

• High-density LED matrix displays
• LED backlighting systems requiring uniform brightness
• Architectural lighting control applications
• Consumer electronics with multi-zone LED indicators

Procurement Notes

Verify the specific ordering suffix matches the required package variant and tape/reel configuration. Confirm that the component meets RoHS standards if environmental compliance is required for your assembly process. Ensure the selected supplier provides genuine Texas Instruments products to avoid counterfeit risks. Check datasheet revisions for any updates to electrical characteristics or recommended operating conditions before finalizing procurement.

Selection Notes

Select this component when high-resolution grayscale control and per-channel current matching are critical. The integrated dot correction feature reduces the need for external calibration, simplifying system design. Consider the 32-VQFN package size for space-constrained PCB layouts. Evaluate the 120 mA sink capability against total LED current requirements to determine if daisy-chaining multiple units is necessary for larger arrays.

Part Context

The TLC5940RHB belongs to the TLC5940 family of LED drivers designed for applications requiring high channel counts and precise dimming. It serves as a solution for managing complex LED arrays where uniformity and color consistency are important. The RHB suffix indicates a specific tape-and-reel packaging option suitable for automated surface-mount assembly processes.

Replacement Considerations

The TLC5940RHBRG4 is a documented equivalent variant within the same product family. Verify pin compatibility and electrical specifications before substitution. Ensure that any replacement part maintains the same grayscale resolution and dot correction functionality to preserve system performance.