# AT25SL128A-MHE-T

**Adesto Technologies** · NOR FLASH · UDFN-8-EP(5x6)

AT25SL128A-MHE-T from Adesto Technologies, in a UDFN-8-EP(5x6). 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 | CS | input | Active-low chip select: high deselects the device and tristates the serial outputs (standby), low enables it, and a falling edge is required after power-up before any instruction. |
| 2 | SO (IO1) | bidirectional | Serial data output clocked out on the falling edge of SCK, becoming I/O1 in Dual/Quad modes, and high-impedance when CS is deasserted. |
| 3 | WP (IO2) | bidirectional | Active-low write protect for the Status Register, used as I/O2 and losing its write-protect function when the QE bit is set for Quad I/O. |
| 4 | GND | power_in | Ground reference for the VCC supply, to be connected to system ground. |
| 5 | SI (IO0) | bidirectional | Serial data input for commands, addresses and data, latched on the rising edge of SCK, becoming I/O0 in Dual/Quad modes. |
| 6 | SCK | input | Serial clock input; instructions, addresses and data are latched on the rising edge and data is shifted out on the falling edge. |
| 7 | HOLD (IO3) | bidirectional | Pauses serial communication without deselecting the device, becomes I/O3 in Quad modes, is internally pulled high and may be left floating if unused (external connection to VCC recommended). |
| 8 | VCC | power_in | Single device supply for all functions including read, program and erase, which must stay stable within the valid VCC range (1.7V to 2.0V). |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Adesto Technologies |
| Package | UDFN-8-EP(5x6) |
| Category | Memory |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `AT25SL128A-MHE-T`
- Footprint: `Package_DFN_QFN:DFN-S-8-1EP_6x5mm_P1.27mm`
- 3D model: UDFN-8-EP(5x6) (KiCad packages3D, STEP)
- 3D model files: `at25sl128a-mhe-t-etched.step` / `at25sl128a-mhe-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at25sl128a-mhe-t.step` / `at25sl128a-mhe-t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Adesto Technologies datasheet](docs/at25sl128a-mhe-t-datasheet.pdf) (75 pp, sha256 `5c053300e8578e94`, retrieved 2026-10-23, tier: lcsc)
- **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/at25sl128a-mhe-t-datasheet.pdf)