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UM3088EESA
Public Made by Adomby adom
Union Semiconductor RS-485 / RS-422 ICs, SOP-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
markdownUM3088EESA
Union Semiconductor · RS-485 / RS-422 ICs · SOP-8
UM3088EESA from Union Semiconductor, in a SOP-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: RO is high when A exceeds B by -50mV and low when A is less than B by 200mV. |
| 2 | RE | input | Active-low receiver output enable: RO is high impedance when RE is high, and driving RE high with DE low puts the device into low-power shutdown. |
| 3 | DE | input | Driver enable: drive DE high to enable the drivers, and the outputs are high impedance when DE is low. |
| 4 | DI | input | Driver input: a low on DI forces output A low and output B high, and a high on DI forces output A high and output B low. |
| 5 | GND | power_in | Ground pin for the device. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output, with ESD protection of ±15kV (Human Body Model and IEC61000-4-2 Air-Gap). |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output, with ESD protection of ±15kV (Human Body Model and IEC61000-4-2 Air-Gap). |
| 8 | VCC | power_in | Power supply for the RS-485 transceiver, specified at +5V ±5% with an absolute maximum of +7V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Union Semiconductor |
| Package | SOP-8 |
| Category | Interface |
| 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 |
|---|---|---|---|---|---|---|---|
| VCC Supply Voltage | VCC | 7 | V | 3 | |||
| Control Input Voltage (RE, DE) | -0.3 | V | 3 | ||||
| Driver Input Voltage (DI) | -0.3 | V | 3 | ||||
| Driver Output Voltage (A, B) | -7.5 | 12.5 | V | 3 | |||
| Receiver Input Voltage (A, B) | -7.5 | 12.5 | V | 3 | |||
| Receiver Output Voltage (RO) | -0.3 | V | 3 | ||||
| Ambient Temperature | TA | -40 | 85 | °C | 3 | ||
| Storage Temperature Range | TSTG | -65 | 160 | °C | 3 | ||
| Lead Temperature for Soldering | TL | 300 | °C | 10 seconds | 3 | ||
| Supply Current | ICC | 0.3 | mA | No Load, DI=GND or VCC, DE=VCC, RE=0V or VCC | 4 | ||
| Supply Current | ICC | 0.25 | mA | No Load, DI=GND or VCC, DE=0V, RE=0V | 4 | ||
| Supply Current in Shutdown Mode | ISHDN | 0.002 | 10 | µA | DE=GND, RE=VCC | 4 | |
| Logic Input High Voltage | VIH1 | 2 | V | DE, DI, RE | 4 | ||
| Logic Input Low Voltage | VIL1 | 0.8 | V | DE, DI, RE | 4 | ||
| Differential Driver Output | VOD1 | 5 | V | No Load, Figure 2 | 4 | ||
| Differential Driver Output | VOD2 | 1.5 | V | Figure 2, R=50Ω | 4 | ||
| Change-in-Magnitude of Differential Output Voltage | ΔVOD | 0.2 | V | Figure 2, R=50Ω (Note 2) | 4 | ||
| Driver Common-Mode Output Voltage | VOC | 3 | V | Figure 2, R=50Ω | 4 | ||
| Change-in-Magnitude of Common-Mode Voltage | ΔVOC | 0.2 | V | Figure 2, R=50Ω (Note 2) | 4 | ||
| Driver Short-Circuit Output Current | IOSD | -250 | mA | VOUT=-7V (Note 3) | 4 | ||
| Driver Short-Circuit Output Current | IOSD | 250 | mA | VOUT=12V (Note 3) | 4 | ||
| Receiver Differential Threshold Voltage | VTH | -200 | -50 | mV | -7V≤VCM≤12V | 5 | |
| Receiver Input Resistance | RIN | 96 | kΩ | -7V≤VCM≤12V | 5 | ||
| Input Current (A and B) | IIN2 | 1 | mA | DE=GND, VCC=GND or 5V; VIN=12V | 5 | ||
| Input Current (A and B) | IIN2 | -0.8 | mA | DE=GND, VCC=GND or 5V; VIN=-7V | 5 | ||
| Receiver Output Low Voltage | VOL | 0.4 | V | IO=2.5mA, VID=200mV | 5 | ||
| Three-State Output Current at Receiver | IOZR | -1 | 1 | µA | VCC=5V, 0V≤VO≤VCC | 5 | |
| Receiver Output Short Circuit Current | IOSR | -60 | 60 | mA | 0V≤VRO≤VCC | 5 | |
| ESD Protection, Human Body Model (A, B) | -15 | 15 | kV | A, B pins | 5 | ||
| ESD Protection, IEC61000-4-2 Air-Gap (A, B) | -15 | 15 | kV | A, B pins | 5 | ||
| ESD Protection, IEC61000-4-2 Contact (A, B) | -8 | 8 | kV | A, B pins | 5 | ||
| Maximum Data Rate | fMAX | 2.5 | Mbps | 7 | |||
| Driver Input-to-Output (low-to-high) | tDPLH | 34 | 60 | ns | Figure 3 and 7, RDIFF=54Ω, CL1=CL2=100pF | 7 | |
| Driver Input-to-Output (high-to-low) | tDPHL | 34 | 60 | ns | Figure 3 and 7, RDIFF=54Ω, CL1=CL2=100pF | 7 | |
| Driver Output Skew | /tDPLH - tDPHL/ | 2.5 | 10 | ns | Figure 3 and 7, RDIFF=54Ω, CL1=CL2=100pF | 7 | |
| Driver Rise or Fall Time | tDR, tDF | 14 | 25 | ns | Figure 3 and 7, RDIFF=54Ω, CL1=CL2=100pF | 7 | |
| Driver Enable to Output High | tDZH | 150 | ns | Figure 4 and 8, CL=100pF, S2 Closed | 7 | ||
| Driver Enable to Output Low | tDZL | 150 | ns | Figure 4 and 8, CL=100pF, S1 Closed | 7 | ||
| Driver Disable Time from Low | tDLZ | 100 | ns | Figure 4 and 8, CL=15pF, S1 Closed | 7 | ||
| Driver Disable Time from High | tDHZ | 100 | ns | Figure 4 and 8, CL=15pF, S2 Closed | 7 | ||
| Receiver Input to Output | tRPLH, tRPHL | 106 | 150 | ns | /VID/≥2.0V, Rise and Fall Time of VID≤15ns | 7 | |
| Differential Receiver Skew | /tRPLH - tRPHL/ | 0 | 10 | ns | Figure 6 and 9, /VID/≥2.0V, Rise and Fall Time of VID≤15ns | 7 | |
| Receiver Enable to Output Low | tRZL | 20 | 50 | ns | Figure 5 and 10, CL=100pF, S1 Closed | 7 | |
| Receiver Enable to Output High | tRZH | 20 | 50 | ns | Figure 5 and 10, CL=100pF, S2 Closed | 7 | |
| Receiver Disable Time from Low | tRLZ | 20 | 50 | ns | Figure 5 and 10, CL=100pF, S1 Closed | 7 | |
| Receiver Disable Time from High | tRHZ | 20 | 50 | ns | Figure 5 and 10, CL=100pF, S2 Closed | 7 | |
| Time to Shutdown | tSHDN | 50 | 200 | 600 | ns | (Note 4) | 7 |
| Driver Enable from Shutdown to Output High | tDZH(SHDN) | 250 | ns | Figure 4 and 8, CL=15pF, S2 Closed | 7 | ||
| Driver Enable from Shutdown to Output Low | tDZL(SHDN) | 250 | ns | Figure 4 and 8, CL=15pF, S1 Closed | 7 | ||
| Receiver Enable from Shutdown to Output High | tRZH(SHDN) | 3500 | ns | Figure 5 and 10, CL=100pF, S2 Closed | 7 | ||
| Receiver Enable from Shutdown to Output Low | tRZL(SHDN) | 3500 | ns | Figure 5 and 10, CL=100pF, S1 Closed | 7 |
CAD (KiCad official)
- Symbol:
UM3088EESA - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
um3088eesa-etched.step/um3088eesa-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um3088eesa.step/um3088eesa.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Union Semiconductor datasheet (14 pp, sha256
1afca2d01d12f207, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).