MAX3078EM

@@ -0,0 +1,44 @@+# MAX3078EM++**HGSEMI** · RS-485 / RS-422 ICs · SOP-8++MAX3078EM from HGSEMI, in a SOP-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 | RO | output | Receiver output. When /RE is low, RO is high if (A-B) ≥ -50mV and low if (A-B) ≤ -200mV. Fail-safe pulls RO high when the bus is open or shorted. CMOS logic level output. |+| 2 | /RE | input | Receiver output enable (active low). RO is enabled when /RE is low; RO is high-impedance when /RE is high. Driving /RE high while DE is low places the device into low-power shutdown mode. Hot-swap input structure. |+| 3 | DE | input | Driver output enable (active high). Driver outputs A,B are enabled when DE is high; outputs are high-impedance when DE is low. Driving DE low while /RE is high places the device into low-power shutdown mode. Hot-swap input structure. |+| 4 | DI | input | Driver data input. When DE is high, a logic low on DI drives A low and B high; a logic high on DI drives A high and B low. CMOS input (V_IH ≥ 2V, V_IL ≤ 0.8V). |+| 5 | GND | power_in | Ground reference (0V). |+| 6 | A | bidirectional | Non-inverting RS-485/RS-422 bus line. Acts as receiver non-inverting input and driver non-inverting output (half-duplex). Absolute range -7V to +12V, ±16kV IEC 61000-4-2 ESD protected. Receiver input impedance ≥96kΩ (1/8 unit load). |+| 7 | B | bidirectional | Inverting RS-485/RS-422 bus line. Acts as receiver inverting input and driver inverting output (half-duplex). Absolute range -7V to +12V, ±16kV IEC 61000-4-2 ESD protected. Receiver input impedance ≥96kΩ (1/8 unit load). |+| 8 | VCC | power_in | Positive supply, 3.15V ≤ VCC ≤ 3.45V (nominal 3.3V). Bypass to GND with a 0.1µF ceramic capacitor placed close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `MAX3078EM`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/max3078em-datasheet.pdf) (17 pp, sha256 `28c5129bb8242502`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/max3078em-datasheet.pdf)

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