# IS32LT3177-GRLA3-TR

**ISSI Integrated Silicon Solution** · LED Drivers · SOP-8-EP

IS32LT3177-GRLA3-TR from ISSI Integrated Silicon Solution, in a SOP-8-EP. 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 | OUT | output | Current sink output; the datasheet gives an absolute maximum output voltage of 44V and a maximum output current of 250mA, and the OUT breakdown voltage is 40V. |
| 2 | OUT | output | Current sink output (second OUT pin, bonded in parallel with pin 1); the datasheet gives an absolute maximum output voltage of 44V and a maximum output current of 250mA. |
| 3 | EN | input | Enable pin: on IS32LT3177 it takes a sufficient supply voltage of 5V to 40V (absolute maximum 44V), and on IS32LT3178 it acts as a PWM input up to 1kHz with absolute maximum 6.0V. |
| 4 | ISET | passive | Output current setting pin; a 1% accuracy resistor between this pin and GND sets the output current (8kΩ ≤ RISET ≤ 160kΩ for SOP-8-EP), and the pin must not be left floating. |
| 5 | GND | power_in | Ground pin; all GND pins must be connected to supply ground. |
| 6 | GND | power_in | Ground pin; all GND pins must be connected to supply ground. |
| 7 | GND | power_in | Ground pin; all GND pins must be connected to supply ground. |
| 8 | GND | power_in | Ground pin; all GND pins must be connected to supply ground. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ISSI Integrated Silicon Solution |
| Package | SOP-8-EP |
| Category | LED Drivers |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `IS32LT3177-GRLA3-TR`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOP-8-EP (KiCad packages3D, STEP)
- 3D model files: `is32lt3177-grla3-tr-etched.step` / `is32lt3177-grla3-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `is32lt3177-grla3-tr.step` / `is32lt3177-grla3-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ISSI Integrated Silicon Solution datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590903794249117696) (22 pp, sha256 `78ab75e127b35486`, retrieved 2026-10-09, tier: lcsc)
- **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/is32lt3177-grla3-tr-datasheet.pdf)