BR25G640FJ-3GE2

@@ -0,0 +1,53 @@+# BR25G640FJ-3GE2++**ROHM Semicon** · EEPROM · SOIC-8++BR25G640FJ-3GE2 from ROHM Semicon, in a SOIC-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 | CSB | input | Chip select input (active LOW). Must be held HIGH during power ON/OFF to prevent erroneous writes; a pull-up to Vcc is recommended. Schmitt-trigger input. |+| 2 | SO | output | Serial data output. Data is shifted out MSB-first synchronous to the falling edge of SCK. High-impedance (High-Z) when CSB=HIGH or during HOLD state. VOH1 = Vcc-0.2V at IOH=-2.0mA (Vcc>=2.5V). |+| 3 | WPB | input | Write protect input (active LOW). When WPB=LOW and WPEN=1 in the status register, the Write Status Register (WRSR) command is prohibited. Schmitt-trigger input. Normally tied to a fixed level (Vcc or GND). |+| 4 | GND | power_in | Ground reference (0V) for all inputs and outputs. Connect to the system ground plane; place bypass capacitor between Vcc (pin 8) and GND close to the device. |+| 5 | SI | input | Serial data input. Opcode, address, and data are shifted in MSB-first on the rising edge of SCK. Schmitt-trigger input. |+| 6 | SCK | input | Serial clock input, up to 20MHz (Vcc>=4.5V). Supports SPI modes (CPOL,CPHA)=(0,0) and (1,1). Schmitt-trigger input with ~0.2V hysteresis; recommended rise time <=100ns. |+| 7 | HOLDB | input | Hold input (active LOW). When asserted LOW while SCK=LOW, suspends serial communication (SO becomes High-Z; SCK/SI become don't-care). Keep CSB=LOW during HOLD; a CSB rise while in HOLD resets the IC. |+| 8 | Vcc | power_in | Positive supply voltage, 1.6V to 5.5V single-supply operation. Absolute max +6.5V. Recommend a 0.1uF bypass capacitor between Vcc and GND placed close to the IC. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM Semicon |+| Package | SOIC-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `BR25G640FJ-3GE2`+- `BR25G640F-3GE2`+- `BR25G640FVT-3GE2`+- `BR25G640FVM-3GTR`+- `BR25G640NUX-3TR`++## CAD (KiCad official)++- Symbol: `BR25G640FJ-3GE2`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589828394084446208) (None pp, sha256 `d74a758a974438ab`, 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/br25g640fj-3ge2-datasheet.pdf)

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