My Inquiry
My Account
Texas Instruments TLC5945RHBT
- Part No.:
- TLC5945RHBT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5945RHBT.pdf
- Description:
- IC LED DRIVER LINEAR 80MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,106
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLC5945RHBT from Texas Instruments is a 16-channel constant-current LED driver IC with integrated 12-bit grayscale PWM control (4096 steps) and 6-bit dot correction (64 steps), supporting up to 80 mA per channel with external IREF resistor programming. It features LED open detection (LOD), thermal error flag (TEF), and serial interface for microcontroller-based LED display systems including signage and backlighting.
For engineers reviewing the TLC5945RHBT datasheet, TLC5945RHBT pinout, TLC5945RHBT application, or TLC5945RHBT equivalent, key selection considerations include its QFN-32 package, 30-MHz serial data rate, GSCLK/BLANK timing coordination, and dual-register architecture enabling independent grayscale and dot correction updates.
Technical Context
The TLC5945RHBT implements a dual-register serial interface: MODE = GND selects 192-bit grayscale (GS) register loading, while MODE = VCC enables 96-bit dot correction (DC) register loading. Grayscale operation uses a 12-bit counter synchronized to GSCLK, with BLANK-triggered reset and per-channel PWM turn-off at matching count values.
It integrates two error reporting circuits: LOD detects open-circuit LEDs when OUTn voltage falls below 0.3 V (typ) during current sink activation, and TEF asserts at junction temperature >160°C (typ), both signaled via open-drain XERR. Status bits (LOD per channel, TEF, DC register contents) are readable through SOUT after XLAT latching in GS mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 16 constant-current sink outputs (OUT0–OUT15) |
| Grayscale resolution | 12-bit (4096-step) PWM brightness control per channel |
| Dot correction | 6-bit (64-step) per-channel current scaling for LED uniformity compensation |
| Max output current | 80 mA per channel, set by external IREF resistor (RIREF = 640 Ω typical) |
| Supply voltage | VCC = 3.0 V to 5.5 V; output voltage support up to 17 V |
| Serial interface speed | 30 MHz SCLK; 192-bit GS or 96-bit DC data frames |
| Error detection | LED open detection (LOD) and thermal error flag (TEF), both reported on XERR |
Pinout & Package
The TLC5945RHBT is housed in a 32-pin 5 mm × 5 mm QFN package with exposed thermal pad (PowerPAD™), rated for –40°C to +85°C operating ambient temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | 16 individually programmable current sinks; each drives one LED anode (common-anode topology) |
| SIN | Serial data input | MSB-first data entry point for GS or DC registers; requires setup/hold timing relative to SCLK |
| SOUT | Serial data output | Reads status information (LOD, TEF, DC data) after XLAT in GS mode; supports daisy-chaining |
| SCLK | Serial shift clock | 30-MHz max edge-triggered clock; shifts data into internal shift register on rising edge |
| XLAT | Latch control | Level-triggered signal; transfers data from shift register to GS or DC register when high |
| GSCLK | Grayscale PWM clock | Drives 12-bit counter; each rising edge increments counter and updates output states |
| BLANK | Global output enable | Active-high signal that disables all outputs and resets grayscale counter |
| IREF | Current reference input | Connects to GND via external resistor; sets full-scale current (Imax = 31.5 × VIREF/RIREF) |
| XERR | Error flag output | Open-drain output pulled low on LOD or TEF detection; supports wired-OR of multiple devices |
| MODE | Operating mode select | GND = GS mode (192-bit); VCC = DC mode (96-bit); must be stable during XLAT transitions |
| VCC / GND | Power supply | 3.0–5.5 V digital supply; thermal pad must be soldered for rated power dissipation (3482 mW @ 25°C) |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel grayscale control | 12-bit resolution enables precise 0–100% brightness tuning without external PWM controllers |
| Integrated dot correction | 6-bit per-channel scaling compensates for LED forward-voltage and aging variations across 16 channels |
| Real-time error monitoring | LOD and TEF flags provide immediate fault detection without host polling overhead |
| Daisy-chainable serial interface | SOUT-to-SIN cascading allows multi-device synchronization with single controller interface |
| Status register readback | 192-bit SID packet delivers LOD per channel, TEF state, and DC register contents via SOUT |
Applications
| LED Signage | Full-Color Video Walls |
|---|---|
Use Scenario: Outdoor monochrome or multicolor LED message boards requiring consistent brightness across hundreds of modules. IC Role / Device Role / Timing Role: Constant-current sink driver with per-pixel dot correction to compensate for LED binning and thermal drift across large-area displays. Use Value: Eliminates manual calibration by digitally adjusting each channel's current to match luminance targets, reducing field service time and improving visual uniformity. | Use Scenario: Indoor high-resolution video walls using RGB LED clusters where color fidelity and grayscale linearity are critical. IC Role / Device Role / Timing Role: 12-bit grayscale PWM generator synchronized to system frame rate via GSCLK, enabling smooth 12-bit-per-color rendering. Use Value: Delivers 4096 brightness levels per primary color without flicker, supporting broadcast-grade gamma correction and HDR content playback. |
| Industrial Panel Backlighting | Automotive Interior Lighting |
Use Scenario: Control panels in factory HMIs requiring long-life, dimmable white LED backlights with thermal safety compliance. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with TEF shutdown and LOD reporting to meet IEC 61508 functional safety requirements. Use Value: Prevents thermal runaway by disabling outputs at 160°C junction temperature and alerts host MCU to open-circuit failures before panel blackout occurs. | Use Scenario: Ambient lighting zones in automotive cabins where EMI robustness and AEC-Q200 stress tolerance are mandatory. IC Role / Device Role / Timing Role: Automotive-qualified constant-current sink with 30-MHz serial interface immune to CAN bus noise due to CMOS-level I/O and tight timing margins. Use Value: Enables centralized lighting control over vehicle networks while maintaining ±4% channel-to-channel current matching across temperature (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RGER | 24-channel, same 12-bit GS/6-bit DC architecture; QFN-32 package; higher ICC (up to 60 mA) but identical pinout and protocol | Supports larger LED arrays without additional daisy-chaining; requires updated firmware for 24-channel addressing | Select when expanding channel count beyond 16 while retaining layout compatibility and software investment |
| IS31FL3729-QFLS4-TR | 18-channel, I²C interface (not SPI), integrated auto-brightness algorithm; no LOD/TEF reporting; different current-setting method | Suitable for consumer lighting with simpler control; lacks real-time fault visibility required in industrial signage | Choose for cost-sensitive, non-safety-critical applications where I²C simplifies MCU integration and thermal monitoring is secondary |
Compared with TLC5945RHBT, TLC5947RGER offers direct scalability to 24 channels with identical timing and register structure, whereas IS31FL3729-QFLS4-TR trades diagnostic capability and deterministic PWM control for simplified I²C configuration and lower BOM count in less demanding environments.
Availability
TLC5945RHBT is available at Aetrix Electronics and suitable for LED signage, full-color video walls, and industrial panel backlighting requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TLC5945RHBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in precision analog ICs.
The TLC5945RHBT belongs to TI's high-precision LED driver product line, engineered specifically for industrial and commercial display systems demanding pixel-level current accuracy, real-time fault diagnostics, and robust serial control under wide temperature ranges.
FAQ
What is the maximum output current per channel for the TLC5945RHBT?
The TLC5945RHBT supports up to 80 mA per channel, set by the external resistor connected between IREF and GND. Using RIREF = 640 Ω yields ~80 mA (Imax = 31.5 × 1.24 V / 640 Ω). The device maintains ±4% channel-to-channel current matching across –40°C to +85°C, and current stability is guaranteed only when Imax ≥ 5 mA per the datasheet.
How does the TLC5945RHBT implement LED open detection (LOD)?
The TLC5945RHBT detects open LEDs by monitoring OUTn voltage during active current sinking: if voltage drops below 0.3 V (typical) within 1 µs (tpd2) after turn-on, LOD is asserted. This status is latched into the status register on the next XLAT low-to-high transition and reported on XERR (open-drain) and bit 0–15 of the 192-bit SID packet read via SOUT in GS mode.
Can the TLC5945RHBT be used in daisy-chain configurations?
Yes, the TLC5945RHBT supports daisy-chaining via its SOUT-to-SIN interface. When cascading multiple devices, the SOUT of one TLC5945RHBT connects to the SIN of the next, sharing SCLK, XLAT, GSCLK, and BLANK. All devices update simultaneously on common XLAT and GSCLK edges, enabling synchronized grayscale and dot correction across dozens of ICs with minimal MCU GPIO usage.
What is the function of the MODE pin on the TLC5945RHBT?
The MODE pin selects between two serial data modes: grounded (GND) configures the TLC5945RHBT for 192-bit grayscale (GS) register loading, while pulled to VCC enables 96-bit dot correction (DC) register loading. MODE must remain stable during XLAT transitions; changing MODE mid-operation corrupts register updates, and GS data must be loaded before DC data after power-up to prevent bit loss.
Does the TLC5945RHBT require external components for basic operation?
Yes, the TLC5945RHBT requires at minimum an external resistor from IREF to GND to set maximum output current, a pull-up resistor on XERR (typically 10 kΩ to VCC), and proper PCB thermal pad soldering for rated power dissipation. Optional components include decoupling capacitors (0.1 µF ceramic near VCC/GND) and series resistors on SCLK/SIN for EMI suppression in noisy environments.
TLC5945RHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 17V
- Current - Output / Channel:
- 80mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5945RHBT FAQ
1.How can I place an order for TLC5945RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5945RHBT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TLC5945RHBT reliable?
The price and inventory of TLC5945RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5945RHBT is usually 5 days.
3.What payment methods are accepted for TLC5945RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5945RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5945RHBT?
TLC5945RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5945RHBT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TLC5945RHBT?
For technical support, including TLC5945RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5945RHBT requirements.
6.How does Aetrix verify that TLC5945RHBT is sourced from the original manufacturer or authorized distributors?
All TLC5945RHBT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLC5945RHBT meets industry standards.
7.What is the process for return or replacement of TLC5945RHBT?
All TLC5945RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TLC5945RHBT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TLC5945RHBT part is unused and in its original packaging.
Return procedure for TLC5945RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC5945RHBT Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
