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SP3485EET
Public Made by Adomby adom
UMW RS-485/RS-422 ICs, TSSOP-8. Pinout cross-checked by two models against 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
markdownSP3485EET
UMW · RS-485/RS-422 ICs · TSSOP-8
SP3485EET from UMW, in a TSSOP-8. 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 | RO | output | Receiver output: when /RE is low, RO is high if A-B ≥ 200mV and low if A-B ≤ -200mV. |
| 2 | /RE | input | Receiver output enable, active low: low enables RO, high puts RO in high impedance, and /RE high with DE low enters low power shutdown mode. |
| 3 | DE | input | Driver output enable: high enables the driver outputs, low puts them in high impedance, and DE low with /RE high enters low power shutdown mode. |
| 4 | DI | input | Driver input: with DE high, DI low forces A low and B high, and DI high forces A high and B low. |
| 5 | GND | power_in | Ground. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output. |
| 8 | VCC | power_in | Power supply, operating range 3.0 to 3.6V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | TSSOP-8 |
| Category | Communication Interface Chip |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 7 | V | 3 | |||
| Voltage of control port | /RE, DE, DI | -0.3 | 7 | V | 3 | ||
| Bus side input voltage | A, B | -7 | 13 | V | 3 | ||
| Receiver output voltage | RO | -0.3 | 7 | V | 3 | ||
| Operating temperature range | -40 | 105 | °C | 3 | |||
| Storage temperature range | -60 | 150 | °C | 3 | |||
| Welding temperature | 300 | °C | 3 | ||||
| Continuous power dissipation | 400 | mW | SOP8 | 3 | |||
| Input high voltage | VIH | 2 | V | DE, DI, /RE | 4 | ||
| Input low voltage | VIL | 0.8 | V | DE, DI, /RE | 4 | ||
| Logic input current | IIN1 | -2 | 2 | µA | DE, DI, /RE | 4 | |
| Change in magnitude of differential output voltage | ∆VOD | 0.2 | V | Figure 2, RL=54Ω | 4 | ||
| Change in magnitude of common mode output voltage | ∆VOC | 0.2 | V | Figure 2, RL=54Ω | 4 | ||
| Output short-circuit current, short-circuit to high | IOSD1 | 250 | mA | Short-circuit to 0V~12V | 4 | ||
| Output short-circuit current, short-circuit to low | IOSD2 | -250 | mA | Short-circuit to -7V~0V | 4 | ||
| Thermal shutdown threshold | 140 | °C | 4 | ||||
| Thermal shutdown hysteresis | 20 | °C | 4 | ||||
| Input current (A, B) | IIN2 | 125 | µA | DE=0V,VCC=0 or 3.3V,VIN=12V | 5 | ||
| Input current (A, B) | IIN2 | -100 | µA | DE=0V,VCC=0 or 3.3V,VIN=-7V | 5 | ||
| Positive-going input threshold voltage | VIT+ | 200 | mV | -7V≤VCM≤12V | 5 | ||
| Negative-going input threshold voltage | VIT- | -200 | mV | -7V≤VCM≤12V | 5 | ||
| Low level output voltage | VOL | 0.4 | V | IOUT=2.5mA, VID=-200mV | 5 | ||
| Tristate leakage current | IOZR | -1 | 1 | µA | 0.4V<VO<2.4V | 5 | |
| Receiver input resistance | RIN | 96 | kΩ | -7V≤VCM≤12V | 5 | ||
| Supply current | ICC1 | 520 | 800 | µA | /RE=0V, DE=0V | 5 | |
| Supply current | ICC2 | 540 | 700 | µA | /RE=VCC, DE=VCC | 5 |
CAD (KiCad official)
- Symbol:
SP3485EET - Footprint:
Package_SO:TSSOP-8_3x3mm_P0.65mm - 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files:
sp3485eet-etched.step/sp3485eet-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sp3485eet.step/sp3485eet.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UMW datasheet (18 pp, sha256
06fdac69a6ccf46e, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).