# MAX485ESA-MS

**MSKSEMI** · RS-485 / RS-422 ICs · SOP-8

MAX485ESA-MS from MSKSEMI, 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: with /RE low, RO goes high when A-B is at or above -50 mV and goes low when A-B is at or below -200 mV. |
| 2 | /RE | input | Active-low receiver output enable: high disables the receiver output (RO high-impedance), and /RE high with DE low puts the device into low-power shutdown. |
| 3 | DE | input | Active-high driver output enable: low puts the driver outputs in high-impedance, and /RE high with DE low puts the device into low-power shutdown. |
| 4 | DI | input | Driver input: with DE high, a low on DI drives A low and B high, and a high on DI drives A high and B low. |
| 5 | GND | power_in | Ground pin; all voltages in the datasheet are referenced to this ground. |
| 6 | A | bidirectional | Non-inverting receiver input and driver output on the bus, rated for bus voltages from -7 V to 13 V. |
| 7 | B | bidirectional | Inverting receiver input and driver output on the bus, rated for bus voltages from -7 V to 13 V. |
| 8 | VCC | power_in | Supply pin for 4.75 V to 5.25 V operation (5 V ±5%), with an absolute maximum of 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 |
|---|---|---|---|---|---|---|---|
| Power supply voltage | VCC |  |  | 7 | V |  | 3 |
| Control port input voltage (/RE, DE, DI) | /RE, DE, DI | -0.3 |  |  | V | Upper limit printed as VCC+0.3 V | 3 |
| Bus side input voltage (A, B) | A, B | -7 |  | 13 | V |  | 3 |
| Receiver output voltage | RO | -0.3 |  |  | V | Upper limit printed as VCC+0.3 V | 3 |
| Operating temperature range |  | -40 |  | 85 | ℃ |  | 3 |
| Storage temperature range |  | -60 |  | 150 | ℃ |  | 3 |
| Soldering temperature |  |  |  | 300 | ℃ |  | 3 |
| Continuous power dissipation |  |  |  | 400 | mW | SOP8 package | 3 |
| Operating supply voltage range | VCC | 4.75 |  | 5.25 | V |  | 2 |
| Driver differential output voltage (no load) | VOD1 |  |  | 5 | V | No load | 4 |
| Driver differential output voltage (RL=27 Ω) | VOD2 | 1.5 |  | 5 | V | Figure 2, RL = 27 Ω | 4 |
| Driver differential output voltage (RL=50 Ω) | VOD2 | 2 |  |  | V | Figure 2, RL = 50 Ω | 4 |
| Change in magnitude of driver differential output voltage | ΔVOD |  |  | 0.2 | V | Figure 2, RL = 27 Ω | 4 |
| Driver common-mode output voltage | VOC |  |  | 3 | V | Figure 2, RL = 27 Ω | 4 |
| Change in magnitude of common-mode output voltage | ΔVOC |  |  | 0.2 | V | Figure 2, RL = 27 Ω | 4 |
| Logic input high voltage | VIH | 2 |  |  | V | DE, DI, /RE | 4 |
| Logic input low voltage | VIL |  |  | 0.8 | V | DE, DI, /RE | 4 |
| Logic input current | IIN1 | -2 |  | 2 | uA | DE, DI, /RE | 4 |
| Driver output short-circuit current, shorted to high | IOSD1 | 35 |  | 250 | mA | Shorted to 0 V to 12 V | 4 |
| Driver output short-circuit current, shorted to low | IOSD2 | -250 |  | -35 | mA | Shorted to -7 V to 0 V | 4 |
| Receiver input current (A, B) | IIN2 |  |  | 125 | uA | DE = 0 V, VCC = 0 or 5 V | 4 |
| Receiver input current (A, B), negative | IIN2 | -100 |  |  | uA | DE = 0 V, VCC = 0 or 5 V | 4 |
| Positive-going receiver input threshold voltage | VIT+ |  |  | -50 | mV | -7 V≤VCM≤12 V | 4 |
| Negative-going receiver input threshold voltage | VIT- | -200 |  |  | mV |  | 4 |
| Receiver input hysteresis voltage | Vhys | 10 | 30 |  | mV | -7 V≤VCM≤12 V | 4 |
| Receiver output low voltage | VOL |  |  | 0.4 | V | IOUT = +4 mA, VID = -200 mV | 4 |
| Three-state (high-impedance) receiver output leakage current | IOZR | -1 |  | 1 | uA | 0.4 V < VO < 2.4 V | 5 |
| Receiver input resistance | RIN | 96 |  |  | kΩ | -7 V≤VCM≤12 V | 5 |
| Receiver short-circuit current | IOSR | 7 |  | 95 | mA | 0 V≤VO≤VCC | 5 |
| Supply current | ICC |  | 180 | 500 | uA | /RE=0 V or VCC, DE = 0 V | 5 |
| Supply current | ICC |  | 170 | 400 | uA | /RE=VCC, DE | 5 |
| Shutdown supply current | ISHDN |  | 0.5 | 10 | uA | DE = 0 V, /RE = VCC | 5 |
| ESD protection, human body model (A, B) |  | 15 |  |  | KV | A, B, human body model | 5 |
| ESD protection, contact discharge (A, B) |  | 15 |  |  | KV | A, B, IEC 61000-4-2 contact discharge | 5 |
| Driver propagation delay, low to high | tDPLH |  |  | 1000 | ns | RDIFF = 54 Ω, CL1=CL2=100 pF (Figures 3 & 4) | 5 |
| Driver propagation delay, high to low | tDPHL |  |  | 1000 | ns | RDIFF = 54 Ω, CL1=CL2=100 pF (Figures 3 & 4) | 5 |
| Driver propagation delay skew | tSKEW1 | -100 |  | 100 | ns |  | 5 |
| Driver rise time | tDR | 200 | 500 | 700 | ns |  | 5 |
| Driver fall time | tDF | 200 | 500 | 700 | ns |  | 5 |
| Driver enable to output high | tDZH |  |  | 2500 | ns | CL=100 pF, S1 closed (Figures 5, 6) | 5 |
| Driver enable to output low | tDZL |  |  | 2500 | ns |  | 5 |
| Driver input low to disable | tDLZ |  |  | 100 | ns | CL=15 pF, S2 closed (Figures 5, 6) | 5 |
| Driver input high to disable | tDHZ |  |  | 100 | ns |  | 5 |
| Driver enable to output high in shutdown | tDZH(SHDN) |  |  | 4500 | ns | Shutdown; CL = 15 pF, S2 closed | 5 |
| Driver enable to output low in shutdown | tDZL(SHDN) |  |  | 4500 | ns | Shutdown; CL = 15 pF, S1 closed | 5 |
| Receiver propagation delay, low to high | tRPLH |  | 127 | 200 | ns | VID≥2.0 V; rise and fall time VID≤15 ns (Figures 7 & 8) | 6 |
| Receiver propagation delay, high to low | tRPHL |  | 127 | 200 | ns |  | 6 |
| Receiver propagation delay skew | tSKEW2 |  | 3 | 30 | ns | Figures 7 & 8 | 6 |
| Receiver enable to output low | tRZL |  | 20 | 50 | ns | CL = 100 pF, S1 closed (Figures 9, 10) | 6 |
| Receiver enable to output high | tRZH |  | 20 | 50 | ns | CL = 100 pF, S2 closed (Figures 9, 10) | 6 |
| Receiver output low to disable | tRLZ |  | 20 | 50 | ns | CL = 100 pF, S1 closed (Figures 9, 10) | 6 |
| Receiver output high to disable | tRHZ |  | 20 | 50 | ns | CL = 100 pF, S2 closed (Figures 9, 10) | 6 |
| Receiver enable to output high in shutdown | tRZH(SHDN) |  |  | 3500 | ns | Shutdown; CL = 100 pF, S2 closed (Figures 9, 10) | 6 |
| Receiver enable to output low in shutdown | tRZL(SHDN) |  |  | 3500 | ns | Shutdown; CL = 100 pF, S1 closed (Figures 9, 10) | 6 |
| Time to enter shutdown | tSHDN | 50 | 200 | 600 | ns | NOTE2: /RE=1, DE=0 duration | 6 |

## CAD (KiCad official)

- Symbol: `MAX485ESA-MS`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `max485esa-ms-etched.step` / `max485esa-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max485esa-ms.step` / `max485esa-ms.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602988512035815424) (13 pp, sha256 `d56adab8fb135a9f`, retrieved 2026-10-19, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/max485esa-ms-datasheet.pdf)