# TLC59731DR

**Texas Instruments** · LED Drivers · SOIC-8

TLC59731DR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT0 | output | Sink driver output 0 (up to 50 mA, max 21 V); multiple outputs can be paralleled to increase sink current and each output can have a different voltage applied. |
| 2 | OUT1 | output | Sink driver output 1 (up to 50 mA, max 21 V); multiple outputs can be paralleled to increase sink current and each output can have a different voltage applied. |
| 3 | OUT2 | output | Sink driver output 2 (up to 50 mA, max 21 V); multiple outputs can be paralleled to increase sink current and each output can have a different voltage applied. |
| 4 | GND | power_in | Power ground. |
| 5 | SDO | output | Serial data output, rated for 2 mA high/low output current and up to 7.0 V absolute maximum. |
| 6 | SDI | input | Serial data input, internally pulled down to GND with a 1-MΩ (typical) resistor, with data rate 20 to 600 kHz. |
| 7 | TEST | passive | TI internal test terminal that must be connected to GND or left open. |
| 8 | VCC | power_in | Power-supply voltage, 3.0 V to 5.5 V without internal shunt regulator mode (up to 6 V in shunt regulator mode, 20 mA max shunt current). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Nixie Tube Driver/LED Driver |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 |  | 7 | V |  | 4 |
| Input voltage SDI | VIN | -0.3 |  |  | V | SDI; max printed as VCC + 1.2 | 4 |
| Output voltage OUT0 to OUT2 | VOUT | -0.3 |  | 21 | V | OUT0 to OUT2 | 4 |
| Output voltage SDO | VOUT | -0.3 |  | 7 | V | SDO | 4 |
| Output current (DC) | IOUT | 0 |  | 60 | mA | OUT0 to OUT2 | 4 |
| Operating junction temperature | TJ | -40 |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 4 |
| ESD HBM | V(ESD) | -8000 |  | 8000 | V | Human body model, ANSI/ESDA/JEDEC JS-001 | 4 |
| ESD CDM | V(ESD) | -2000 |  | 2000 | V | Charged-device model, JESD22-C101 | 4 |
| Supply voltage, no internal shunt regulator mode | VCC | 3 | 5 | 5.5 | V | No internal shunt regulator mode | 5 |
| Supply voltage, internal shunt regulator mode | VCC |  | 6 |  | V | Internal shunt regulator mode | 5 |
| Voltage applied to output | VO |  |  | 21 | V | OUT0 to OUT2 | 5 |
| High-level output current | IOH | -2 |  |  | mA | SDO | 5 |
| Low-level output current SDO | IOL |  |  | 2 | mA | SDO | 5 |
| Low-level output current OUT | IOL |  |  | 50 | mA | OUT0 to OUT2 | 5 |
| Shunt regulator sink current | IREG |  |  | 20 | mA | VCC | 5 |
| Operating free-air temperature | TA | -40 |  | 85 | °C |  | 5 |
| Operating junction temperature | TJ | -40 |  | 125 | °C |  | 5 |
| Data transfer rate | fCLK (SDI) | 20 |  | 600 | kHz | SDI | 5 |
| SDI input pulse duration | tSDI | 275 |  |  | ns | SDI; max printed as 0.5 / fCLK | 5 |
| Pulse duration, high | tWH | 14 |  |  | ns | SDI | 5 |
| Pulse duration, low | tWL | 14 |  |  | ns | SDI | 5 |
| Low-level output voltage (SDO) | VOL | 0 |  | 0.4 | V | IOL = 2 mA | 6 |
| Shunt regulator output voltage (VCC) | VR |  | 5.9 |  | V | ICC = 1 mA, SDI = low | 6 |
| Supply current (VCC) | ICC0 |  | 2.3 | 3.5 | mA | VCC = 3 V to 5.5 V, SDI = low, all grayscale (GSn) = FFh, VOUTn = 0.6 V, SDO = 15 pF | 6 |
| Supply current (VCC) | ICC1 |  | 2.6 | 4.5 | mA | VCC = 3 V to 5.5V, SDI = 600 kHz, GSn = FFh, VOUTn = 0.6 V, SDO = 15 pF | 6 |
| Output leakage current (OUT0 to OUT2) | IOLKG |  |  | 0.1 | µA | GSn = 00h, VOUTn = 21 V, TJ = -40°C to +85°C | 6 |
| Output leakage current (OUT0 to OUT2) | IOLKG |  |  | 0.2 | µA | GSn = 00h, VOUTn = 21 V, TJ = +85°C to +125°C | 6 |
| Internal pulldown resistance (SDI) | RPD |  | 1 |  | MΩ | At SDI | 6 |
| Rise time SDO | tR0 | 2 | 6 | 12 | ns | SDO | 6 |
| Fall time SDO | tF0 | 2 | 6 | 12 | ns | SDO | 6 |
| Shift data output one pulse duration | tWO | 75 | 125 | 250 | ns | SDO↑ to SDO↓ | 6 |
| Internal GS oscillator frequency | fOSC | 4 | 6 | 8 | MHz |  | 6 |
| Junction-to-ambient thermal resistance | RθJA |  | 134.6 |  | °C/W | D (SOIC) 8 pins | 5 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 88.6 |  | °C/W | D (SOIC) 8 pins | 5 |
| Junction-to-board thermal resistance | RθJB |  | 75.3 |  | °C/W | D (SOIC) 8 pins | 5 |
| Junction-to-top characterization parameter | ψJT |  | 37.7 |  | °C/W | D (SOIC) 8 pins | 5 |
| Junction-to-board characterization parameter | ψJB |  | 74.8 |  | °C/W | D (SOIC) 8 pins | 5 |

## CAD (KiCad official)

- Symbol: `TLC59731DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `tlc59731dr-etched.step` / `tlc59731dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlc59731dr.step` / `tlc59731dr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tlc59731.pdf) (32 pp, sha256 `5ef2ed639d74e3f8`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tlc59731dr-datasheet.pdf)