# ETA9640E8A

**etasolution** · Battery Management · ESOP8

ETA9640E8A from etasolution, in a ESOP8. 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 | ACIN | input | Charger input pin that connects to an AC adaptor or a USB charger output. |
| 2 | BAT | power_in | Battery input pin that should be bypassed to GND with a 10uF or greater ceramic capacitor. |
| 3 | EN | input | Enable pin that must be driven high to enable the IC, and is disabled when driven low or left floating. |
| 4 | SW | output | Switching node of the switching regulator that connects through a 1uH to 4.7uH inductor to the positive terminal of the battery. |
| 5 | OUT | power_out | Output pin that should be bypassed to ground closely with a 22uF or larger ceramic capacitor. |
| 6 | GP | power_in | Power ground pin for the IC. |
| 7 | LED | output | Pin that drives the LED for battery quantity display or torch lighting, with a stated LED sink current of 5 mA. |
| 8 | ISET | passive | Charge current set pin where a resistor Rset connected to GND sets the fast charge current as Icharge = 1000/Rset (A). |
| 9 | GA | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | etasolution |
| Package | ESOP8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `ETA9640E8A`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: ESOP8 (KiCad packages3D, STEP)
- 3D model files: `eta9640e8a-etched.step` / `eta9640e8a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eta9640e8a.step` / `eta9640e8a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [etasolution datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905716746104832) (5 pp, sha256 `014ca14220df5b10`, 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/eta9640e8a-datasheet.pdf)