Specifications
| Type | Description |
|---|---|
| Part Number | TLC5971 |
| Manufacturer | Texas Instruments |
| Product Type | SMD LED |
| Category | LED |
| Component Type | Power_IC |
| Package / Case | HTSSOP-20 6.50 mm x 4.40 mm; VQFN-24 4.00 mm x 4.00 mm |
| Output Channels | 12 constant-current sink output channels |
| Channel Current Capability | 60 mA per channel |
| Grayscale PWM Resolution | 16-bit, 65536 steps |
| Global Brightness Control Resolution | 7-bit, 128 steps per color group |
| Internal Regulator Supply Voltage Range | 6 V to 17 V |
| Direct Power Supply Voltage Range | 3 V to 5.5 V |
| LED Supply Voltage | Up to 17 V |
| Channel-to-Channel Current Accuracy | ±1% typ |
| Device-to-Device Current Accuracy | ±1% typ |
| Data Transfer Rate | 20 MHz |
| Internal Linear Regulator Output | 3.3 V |
| Operating Temperature Range | -40°C to +85°C |
| Maximum Supply Voltage | -0.3 V to 18 V |
| IREF Input Voltage | -0.3 V to VREG + 0.3 V |
| SDTI/SCKI Input Voltage | -0.3 V to VREG + 0.6 V |
| Constant-Current Output Voltage | -0.3 V to 18 V |
| SDTO/SCKO Output Voltage | -0.3 V to VREG + 0.3 V |
| VREG Voltage | -0.3 V to 6 V |
| Output Current DC | 75 mA max |
| VREG Output Current DC | -30 mA max |
| Maximum Operating Junction Temperature | 150°C |
| Storage Temperature | -55°C to 150°C |
| ESD Rating HBM | ±4000 V |
| ESD Rating CDM | ±2000 V |
| Recommended VCC | 6 V min, 17 V max |
| Recommended VREG Supply | 3 V min, 3.3 V nom, 5.5 V max |
| Recommended Output Voltage | 17 V max |
| High-Level Input Voltage | 0.7 x VREG min, VREG max |
| Low-Level Input Voltage | GND min, 0.3 x VREG max |
| Input Voltage Hysteresis | 0.2 x VREG |
| High-Level Output Current | -2 mA |
| Low-Level Output Current | 2 mA |
| Recommended Constant Output Sink Current | 60 mA max |
| Recommended VREG Regulator Output Current | -25 mA max |
| Operating Junction Temperature | -40°C to 125°C |
| SCKI Clock Frequency | 0.007 MHz min, 20 MHz max |
| SCKI Pulse Duration | 10 ns min |
| SDTI Setup Time | 5 ns min |
| SDTI Hold Time | 3 ns min |
| Thermal Resistance Junction-to-Ambient | 68.6°C/W PWP; 38°C/W RGE |
| Thermal Resistance Junction-to-Case Top | 44.2°C/W PWP; 40.5°C/W RGE |
| Thermal Resistance Junction-to-Board | 19.3°C/W PWP; 10.2°C/W RGE |
| Junction-to-Top Characterization Parameter | 2.7°C/W PWP; 0.3°C/W RGE |
| Junction-to-Board Characterization Parameter | 15.7°C/W PWP; 10°C/W RGE |
| Thermal Resistance Junction-to-Case Bottom | 1.8°C/W PWP; 2.9°C/W RGE |
| High-Level Output Voltage | VREG - 0.4 V min, VREG max |
| Low-Level Output Voltage | 0 V min, 0.4 V max |
| Input Current | -1 µA min, 1 µA max |
| Supply Current ICC | 2 mA typ, 4 mA max |
| Supply Current ICC1 | 6 mA typ, 9 mA max |
| Supply Current ICC2 | 14 mA typ, 22 mA max |
| Supply Current ICC3 | 21 mA typ, 36 mA max |
| Constant Output Current | 56.3 mA min, 60.5 mA typ, 64.7 mA max |
| Output Leakage Current | 0.1 µA typ |
| Serial Shift Register Length | 224 bits |
| VREG Decoupling Capacitor | 1 µF |
| IREF Function | External resistor sets maximum current for every constant-current output |
| IREF Output Disable | All outputs forced off |
| Cascading | Unlimited device cascading |
| Thermal Shutdown | Thermal shutdown with auto restart |
| Datasheet Status | request_only |
Product Overview
The TLC5971 is a Texas Instruments 12-channel RGB LED driver built around constant-current sink outputs. Each channel supports up to 60 mA, with 16-bit grayscale PWM control and 7-bit brightness control for each RGB color group. Current matching is specified at ±1% typical channel-to-channel and ±1% typical device-to-device accuracy.
Power options include a 6 V to 17 V VCC range when the internal 3.3 V linear regulator is used, or 3 V to 5.5 V operation when VREG is connected to VCC. LED/output supply voltage is supported up to 17 V. The serial interface operates up to 20 MHz and uses a 224-bit shift register for SDTI-to-SDTO data transfer.
The device is available in HTSSOP-20 6.50 mm x 4.40 mm and VQFN-24 4.00 mm x 4.00 mm packages. It is specified for -40°C to +85°C free-air operation, with recommended junction operation from -40°C to 125°C, thermal shutdown with auto restart, and unlimited cascading for expanded RGB LED channel counts.
Key Features
- 12 constant-current sink output channels
- 60 mA maximum recommended sink current per channel
- 16-bit grayscale PWM with 65536 control steps
- 7-bit brightness control per RGB color group
- 6 V to 17 V operation with internal regulator
- 3 V to 5.5 V direct VREG/VCC operation
- LED/output supply voltage supported up to 17 V
- 20 MHz serial interface data transfer rate
- 224-bit serial shift register for SDTI and SDTO
- Unlimited device cascading for expanded channel count
- Thermal shutdown turns outputs off with auto restart
- External IREF resistor sets maximum output current
Typical Applications
- RGB LED driver boards
- Multi-channel LED dimming
- Cascaded LED control systems
- High-resolution grayscale LED control
- 17 V LED supply designs
- Constant-current RGB lighting modules
- Serially controlled LED assemblies
Procurement Notes
When requesting a quote for TLC5971, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For LED and optoelectronic sourcing, brightness bin, wavelength or color temperature bin, forward voltage range, viewing angle, moisture sensitivity level and soldering process limits may affect final selection, availability and lead time.
FAQ
How many LED output channels does TLC5971 provide?
TLC5971 provides 12 constant-current sink output channels. Each channel is specified for 60 mA per-channel capability, with a recommended constant output sink current limit of 60 mA maximum.
What PWM and brightness control resolutions are supported?
The device supports 16-bit grayscale PWM control with 65536 steps. It also includes 7-bit global brightness control with 128 steps for each RGB color group.
What supply voltage options are specified for TLC5971?
With the internal linear regulator used, recommended VCC is 6 V minimum to 17 V maximum. When VREG is connected to VCC for direct supply operation, the recommended VREG supply range is 3 V to 5.5 V.
What happens if IREF is connected directly to ground?
The IREF pin normally uses an external resistor to set the maximum current for every constant-current output. If IREF is directly connected to GND, all outputs are forced off.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 22, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.