AT24C128MM

@@ -0,0 +1,53 @@+# AT24C128MM++**HGSEMI** · EEPROM · MSOP-8++AT24C128MM from HGSEMI, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | E0 | input | Slave address input bit 0. Combined with E1/E2 to select one of up to 8 devices on the same I2C bus. Internally pulled down to Vss if left floating. |+| 2 | E1 | input | Slave address input bit 1. Hardware-selectable device address bit; internally pulled down to Vss if left floating. |+| 3 | E2 | input | Slave address input bit 2. Hardware-selectable device address bit; internally pulled down to Vss if left floating. |+| 4 | Vss | power_in | Ground reference for the Vcc supply. |+| 5 | SDA | bidirectional | I2C serial data (bidirectional, open-drain). Requires an external pull-up resistor to Vcc. Input capacitance approx. 8 pF. |+| 6 | SCL | input | I2C serial clock input. Positive-edge clocks data in, negative-edge clocks data out. Supports up to 400 kHz (1.7V) or 1 MHz (higher Vcc). |+| 7 | WCB | input | Write Control input, active low. Tie to Vss to allow write operations; tie to Vcc to inhibit all writes to the memory array. Internally pulled down to Vss if left floating. |+| 8 | VCC | power_in | Supply voltage input, 1.7V to 5.5V. Typical read current 0.2 mA and write current 0.8 mA at 400 kHz. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | MSOP-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++- `AT24C128MM/TR`+- `AT24C128MMN`+- `AT24C128MMM/TR`+- `AT24C128MMMT/TR`+- `AT24C128MMDQ2/TR`+- `AT24C128MMDQ3/TR`+- `AT24C128MMM5/TR`++## CAD (KiCad official)++- Symbol: `AT24C128MM`+- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`+- 3D model: MSOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/at24c128mm-datasheet.pdf) (19 pp, sha256 `ade6fc1683c10678`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/at24c128mm-datasheet.pdf)

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