MAX485CPA

MAX485CPA is an 8‑pin Maxim RS-485/RS-422 transceiver (part of the MAX485 family). It enables half‑duplex differential communication over twisted pair from a 5V supply. Key features: low power, 1/8 unit‑load on the bus, failsafe receiver (output remains valid when lines are idle/open), driver/receiver enable controls, and ESD protection. Typical data rate reaches up to about 2.5 Mbps. Common uses include industrial controls, building automation, DMX lighting, and other multi‑drop networks. The CPA suffix indicates a specific packaging/qualification option; check the datasheet for exact package type, temperature range, and ordering details.

Equivalent RS-485 transceivers to MAX485CPA (5V, half‑duplex):
- TI SN65HVD178 / SN65HVD178A
- Analog Devices ADM485
- NXP PCA82C250
- STMicroelectronics SP3485 (and ST485)
- Maxim MAX487
These are common drop‑in equivalents; verify pinout and timing for exact substitution.

Key features of MAX485CPA (RS-485 transceiver):
- Half‑duplex RS‑485/RS‑422 transceiver
- 5V single‑supply operation
- 1/8 unit load on the bus (up to 256 nodes on one bus)
- Integrated fail‑safe receiver: RO goes high if A or B is idle/open/shorted
- 3‑state outputs with DE (driver enable) and RE (receiver enable)
- Low quiescent current; available in shutdown/power‑down mode
- Bus pin ESD protection
- Data rate up to about 2.5 Mbps (typical)
- 8‑pin CPA package (SOP‑8), RoHS‑compliant

- Pin count: 8 pins
- Function: Low-power, half-duplex RS-485/RS-422 transceiver. Converts DI (driver input) to differential A/B bus signals and provides RO (receiver output) from the bus. DE enables the transmitter; RE enables the receiver (active low). Pins include A, B, DI, RO, DE, RE, Vcc, and GND.

- Manufacturer: Maxim Integrated (the MAX485CPA is a Maxim part; Maxim was acquired by Analog Devices in 2021, so it is now under Analog Devices).
- What kind of company: An American semiconductor company that designs and manufactures analog and mixed-signal integrated circuits; traditionally fabless (outsourced fabrication).

- Industrial automation and process control (PLCs, RTUs, DCS networks)
- Building automation (HVAC, lighting, access control, sensors)
- Data acquisition and remote telemetry (remote sensors, meters)
- SCADA and remote monitoring systems
- Multi-point RS-485 networks (multi-drop, long-distance, robust noise immunity)
- Harsh/industrial environments requiring differential signaling and rugged communication

MAX485CPA is in an 8-pin SOIC (Small-Outline Integrated Circuit) package.