# TM1818-QSOP24

**TM Shenzhen Titan Micro Elec** · LED Drivers · QSOP-24

TM1818-QSOP24 from TM Shenzhen Titan Micro Elec, in a QSOP-24. 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 | GND | power_in | Ground for control logic and the constant-current drive return path; datasheet voltages are referenced to network ground. |
| 2 | SDI | input | Serial data input with Schmitt-trigger buffer; data is shifted in on the CLK rising edge, with a maximum clock frequency of 25 MHz. |
| 3 | CLK | input | Serial shift clock input with Schmitt-trigger buffer; data shifts on the rising edge, with a maximum clock frequency of 25 MHz. |
| 4 | LE | input | Latch enable with Schmitt-trigger buffer; when LE is high serial data passes into the input latch, and when LE is low the data is latched. |
| 5 | OUT0 | output | Constant-current sink output channel 0; this output may be shorted to other outputs to obtain higher output current, with DC output current absolute maximum of 65 mA and output voltage range -0.4 V to +6.0 V. |
| 6 | OUT1 | output | Constant-current sink output channel 1; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 7 | OUT2 | output | Constant-current sink output channel 2; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 8 | OUT3 | output | Constant-current sink output channel 3; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 9 | OUT4 | output | Constant-current sink output channel 4; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 10 | OUT5 | output | Constant-current sink output channel 5; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 11 | OUT6 | output | Constant-current sink output channel 6; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 12 | OUT7 | output | Constant-current sink output channel 7; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 13 | OUT8 | output | Constant-current sink output channel 8; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 14 | OUT9 | output | Constant-current sink output channel 9; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 15 | OUT10 | output | Constant-current sink output channel 10; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 16 | OUT11 | output | Constant-current sink output channel 11; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 17 | OUT12 | output | Constant-current sink output channel 12; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 18 | OUT13 | output | Constant-current sink output channel 13; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 19 | OUT14 | output | Constant-current sink output channel 14; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 20 | OUT15 | output | Constant-current sink output channel 15; current is set by R-EXT, with output withstand voltage of 5.5 V recommended and 6.0 V absolute maximum. |
| 21 | OE | input | Output enable, active low: low turns on OUT0-OUT15, high turns them off; the pin has an internal pull-up to VCC of 32-48 kΩ. |
| 22 | SDO | output | Serial data output updated on the CLK rising edge, intended to connect to the SDI of the next device in the chain; VOH is at least VCC-0.4 V at -6 mA. |
| 23 | R-EXT | bidirectional | Constant-current setting pin; an external resistor to GND sets the OUT0-OUT15 current, with Riref about 1.16 V (470 Ω gives about 37 mA and 1.2 kΩ gives about 14.5 mA). |
| 24 | VCC | power_in | Chip supply voltage, specified from 3.0 V to 5.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TM Shenzhen Titan Micro Elec |
| Package | QSOP-24 |
| Category | LED Drivers |
| Pins | 24 |

## 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 | 3 | 5 | 5.5 | V |  | 5 |
| Output withstand voltage | VO |  |  | 5.5 | V | OUT0~OUT15 | 5 |
| High-level output current | IOH | -8 |  |  | mA | VCC=5V, SDO=4.5V | 5 |
| Low-level output current | IOL | 16 |  |  | mA | VCC=5V, SDO=0.5V | 5 |
| Constant output sink current | IOLC | 2 |  | 45 | mA | OUT0~OUT15, 3V<=VCC<=3.6V | 5 |
| Constant output sink current | IOLC | 2 |  | 60 | mA | OUT0~OUT15, 3.6V<=VCC<=5.5V | 5 |
| Operating temperature range | TA | -40 |  | 85 | °C |  | 5 |
| Operating junction temperature range | TJ | -40 |  | 125 | °C |  | 5 |
| Data shift clock frequency | FCLK |  |  | 25 | MHz | CLK | 5 |
| CLK pulse duration | TWH0 | 15 |  |  | ns | CLK | 5 |
| LE pulse duration | TWH1 | 25 |  |  | ns | LE | 5 |
| OE pulse duration high | TWH2 | 60 |  |  | ns | OE | 5 |
| OE pulse duration low | TWL2 | 30 |  |  | ns | OE | 5 |
| Setup time SDI to CLK rising | TSU0 | 5 |  |  | ns | SDI to CLK rising | 5 |
| Setup time LE falling to CLK rising | TSU1 | 12 |  |  | ns | LE falling to CLK rising | 5 |
| Hold time SDI after CLK rising | TH0 | 5 |  |  | ns | SDI after CLK rising | 5 |
| Hold time LE falling to CLK rising | TH1 | 12 |  |  | ns | LE falling to CLK rising | 5 |
| Supply voltage | VCC | -0.4 |  | 6 | V |  | 4 |
| Input voltage range SDI, CLK, LE, OE | VIN | -0.4 |  |  | V | Upper limit printed as VCC+0.4 V | 4 |
| Output DC current | IOUT |  |  | 65 | mA | OUT0~OUT15 | 4 |
| Output voltage range OUT0~OUT15, SDO | VOUT | -0.4 |  | 6 | V | OUT0~OUT15, SDO | 4 |
| Clock frequency | FCLK |  |  | 25 | MHZ | CLK, SDI, LE, OE | 4 |
| Operating temperature range | Torp | -40 |  | 85 | ℃ |  | 4 |
| Storage temperature range | Ttsg | -55 |  | 150 | ℃ |  | 4 |
| ESD human body model | HBM |  |  | 4000 | V | Human body model | 4 |
| ESD machine model | MM |  |  | 300 | V | Machine model | 4 |
| Low-level output voltage | VOL |  |  | 0.4 | V | IOL=10mA: SDO | 6 |
| Input current | IIN | -1 |  | 1 | uA | VIN=VCC or GND, SDI, CLK, LE, OE | 6 |
| Supply current | ICC0 |  | 11 | 12 | mA | SDI/CLK/LE=0, OE=1, Riref open | 6 |
| Supply current | ICC1 |  | 12 | 13 | mA | SDI/CLK/LE=0, OE=1, Riref=1.2K | 6 |
| Supply current | ICC2 |  | 15 | 16 | mA | OUT0~OUT15 on, SDI/CLK/LE/OE=0, Riref=470Ω | 6 |
| Supply current | ICC3 |  | 13 | 14 | mA | OUT0~OUT15 on, SDI/CLK/LE/OE=0, Riref=1.2K | 6 |
| Constant output current | IOLO | 36.3 | 37 | 37.7 | mA | OUT0~OUT15 on, VOUTn=1V=VOUTfix=1V, Riref=470Ω, VCC=5V, TA=25℃ | 6 |
| Output leakage current | LOLKG |  |  | 0.1 | uA | OUTn=OFF, VOUTn=VOUTfix=5.5V, OE=1, Riref=1.5K | 6 |
| Constant current error, channel to channel | ΔIOLC0 | -1.5 | 1 | 1.5 | % | OUT0~OUT15 on, VOUTn=1V=VOUTfix=1V, Riref=470Ω | 6 |
| Constant current error, chip to chip | ΔIOLC1 | -2 | 1.5 | 2 | % | OUT0~OUT15 on, VOUTn=1V=VOUTfix=1V, Riref=1.5K, VCC=3V~5V, TA=25℃ | 6 |
| Line regulation | ΔIOLC2 | -1 | 0.5 | 1 | %/V | OUT0~OUT15 on, VOUTn=1V=VOUTfix=1V, Riref=470Ω, VCC=3V~5V | 6 |
| Load regulation | ΔIOLC3 | -3 | 1 | 3 | %/V | OUT0~OUT15 on, VOUTn=1V~3V, VOUTfix=1V, Riref=470Ω | 6 |
| Reference voltage output | VIREF | 1.1 | 1.16 | 1.22 | V | Riref=470Ω, TA=25℃ | 6 |
| Pull-up resistance | RPUP | 32 | 40 | 48 | kΩ | OE | 6 |
| Pull-down resistance | RPDWN | 32 | 40 | 48 | kΩ | LE | 6 |
| Rise time SDO | TR0 |  | 50 | 100 | nS | SDO | 7 |
| Rise time OUTn | TR1 |  | 80 | 160 | nS | OUTn | 7 |
| Fall time SDO | TF0 |  | 50 | 100 | nS | SDO | 7 |
| Fall time OUTn | TF1 |  | 80 | 160 | nS | OUTn | 7 |
| Propagation delay CLK rising to SDO | TD0 |  | 60 | 120 | nS | CLK rising to SDO transition | 7 |
| Propagation delay LE or OE to OUT0/OUT7/OUT8/OUT15 on/off | TD1 |  | 100 | 150 | nS | LE rising or OE transition to OUT0/OUT7/OUT8/OUT15 on/off | 7 |
| Propagation delay LE or OE to OUT1/OUT6/OUT9/OUT14 on/off | TD2 |  | 120 | 170 | nS | LE rising or OE transition to OUT1/OUT6/OUT9/OUT14 on/off | 7 |
| Propagation delay LE or OE to OUT2/OUT5/OUT10/OUT13 on/off | TD3 |  | 140 | 190 | nS | LE rising or OE transition to OUT2/OUT5/OUT10/OUT13 on/off | 7 |
| Propagation delay LE or OE to OUT3/OUT4/OUT11/OUT12 on/off | TD4 |  | 160 | 210 | nS | LE rising or OE transition to OUT3/OUT4/OUT11/OUT12 on/off | 7 |
| Output error time | TON_ERR | -50 |  | 50 | nS |  | 7 |

## CAD (KiCad official)

- Symbol: `TM1818-QSOP24`
- Footprint: `Package_SO:QSOP-24_3.9x8.7mm_P0.635mm`
- 3D model: QSOP-24 (KiCad packages3D, STEP)
- 3D model files: `tm1818-qsop24-etched.step` / `tm1818-qsop24-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tm1818-qsop24.step` / `tm1818-qsop24.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TM Shenzhen Titan Micro Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590902553268350976) (10 pp, sha256 `ea19e116e2685809`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/tm1818-qsop24-datasheet.pdf)