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UM3488EESA
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Union Semiconductor RS-485/RS-422 ICs, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUM3488EESA
Union Semiconductor · RS-485/RS-422 ICs · SOP-8
UM3488EESA from Union Semiconductor, 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 | VCC | power_in | Positive supply input. Operating range 3.135V ≤ VCC ≤ 3.465V (nominal +3.3V ±5%). Absolute maximum +7V. Typical quiescent current 180µA. |
| 2 | RO | output | Receiver output. RO is high when the receiver differential input A−B ≥ −50mV, and low when A−B ≤ −200mV. CMOS-level output; VOH ≥ VCC−0.4V at IO=−4mA, VOL ≤ 0.4V at IO=4mA. |
| 3 | DI | input | Driver input. A logic low on DI forces the non-inverting output (Y) low and the inverting output (Z) high; a logic high on DI drives Y high and Z low. VIH ≥ 2.0V, VIL ≤ 0.8V, ~100mV input hysteresis. |
| 4 | GND | power_in | Device ground reference. All voltages are referred to this pin unless otherwise noted. |
| 5 | Y | output | Non-inverting differential driver output (RS-422). Driven high or low relative to Z per DI state, always enabled on UM3488 (no DE pin). ±15kV HBM ESD protected; short-circuit current ±250mA. |
| 6 | Z | output | Inverting differential driver output (RS-422), complementary to Y. Always enabled on UM3488. ±15kV HBM ESD protected; short-circuit current ±250mA. |
| 7 | B | input | Inverting differential receiver input (RS-422). Together with A forms the receiver differential pair; VTH typ −125mV. Fail-safe guarantees RO=high if the bus is open, shorted, or terminated with no active driver. 1/8-unit-load input (RIN ≥ 96kΩ) allowing 256 transceivers on the bus. |
| 8 | A | input | Non-inverting differential receiver input (RS-422). Together with B forms the receiver differential pair. Common-mode range −7V to +12V; ±15kV HBM ESD protected; 1/8-unit-load (RIN ≥ 96kΩ). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Union Semiconductor |
| Package | SOP-8 |
| Category | Comm/UART |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UM3488EESAUM3488EESAEEPAUM3488EESAEESEUM3488EESAEEPE
CAD (KiCad official)
- Symbol:
UM3488EESA - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
um3488eesa-etched.step/um3488eesa-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um3488eesa.step/um3488eesa.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Union Semiconductor datasheet (17 pp, sha256
64342b95d538e6d2, 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).