component
ADM3485
Public Made by Adomby adom
ADI 3.3 V RS-485/RS-422 transceiver, SOIC-8. Half-duplex, up to 12 Mbps, 32 nodes. Datasheet-verified.
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
markdownADM3485
Analog Devices · RS-485 transceiver · SOIC-8
Half-duplex RS-485/RS-422 transceiver running from a single 3.3 V supply. A driver and receiver share the A/B bus pair, with DE enabling the driver and RE the receiver, so one chip both sends and listens on a two-wire multidrop line up to 12 Mbps. It supports up to 32 nodes on a bus and holds valid receiver output for open, short, and idle lines. A standard 3.3 V RS-485 interface for industrial serial links.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RO | output | Receiver Output. When the receiver is enabled (RE low), if A − B > 200 mV then RO = high; if A − B < −200 mV then RO = low. Drives CMOS logic levels referenced to VCC (3.3 V). |
| 2 | RE | input | Receiver Output Enable (active low). A low level enables the receiver output RO; a high level places it in high impedance. If RE is high and DE is low, the device enters low power shutdown mode. |
| 3 | DE | input | Driver Output Enable (active high). A high level enables the differential driver outputs A and B; a low level places them in high impedance. If RE is high and DE is low, the device enters low power shutdown mode. |
| 4 | DI | input | Driver Input. With the driver enabled (half-duplex), a logic low on DI forces A low and B high; a logic high on DI forces A high and B low. CMOS input, VIH ≥ 2.0 V, VIL ≤ 0.8 V. |
| 5 | GND | power_in | Ground reference (0 V) for the transceiver. |
| 6 | A | bidirectional | Noninverting Receiver Input A and Noninverting Driver Output A (shared bus pin in half-duplex operation). Bus common-mode range −7 V to +12 V; receiver input impedance 12 kΩ minimum. |
| 7 | B | bidirectional | Inverting Receiver Input B and Inverted Driver Output B (shared bus pin in half-duplex operation). Bus common-mode range −7 V to +12 V; receiver input impedance 12 kΩ minimum. |
| 8 | VCC | power_in | Power Supply, 3.3 V ± 0.3 V. Absolute maximum 7 V to GND. Typical ICC = 1.1 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Type | RS-485 / RS-422 transceiver (half-duplex) |
| Supply | 3.3 V |
| Data rate | Up to 12 Mbps |
| Bus loading | Up to 32 nodes |
| Enables | DE (driver), RE (receiver) |
| Fail-safe | Receiver defined for open/short/idle |
| Package | SOIC-8 |
Ordering variants
ADM3485ARZ (SOIC-8)ADM3485EARZ (SOIC-8, +/-15 kV ESD)ADM3485ARMZ (MSOP-8)
CAD (KiCad official)
- Symbol:
Interface_UART:ADM3485xR (KiCad official) - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
adm3485-etched.step/adm3485-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);adm3485.step/adm3485.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (20 pp, sha256
e7fcba7f9a3919f7, retrieved 2026-08-17, tier: manufacturer) - 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).