Quad RS422/RS485 driver — 100 Mbps, industrial temp, 16-SOIC
The LTC1689IS#PBF from Analog Devices is a quad RS422/RS485 line driver in a 16-SOIC surface-mount package. It delivers 100 Mbps data rate across four independent driver channels, operates from either a 3V or 5V supply, and is rated for the -40°C to 85°C industrial temperature range. This part is suited for high-speed differential data transmission in factory automation, outdoor telecom, and instrumentation backplanes where signal integrity over twisted-pair cabling matters.
100 Mbps — what it means for the bus
At 100 Mbps, this driver supports high-throughput links such as Profibus or custom point-to-point serial backplanes. The 4/0 driver/receiver count means you get four transmit channels with no onboard receivers — plan for external RS485 receivers if full duplex is needed. The 3V/5V supply flexibility lets it interface directly with 3.3V FPGAs or 5V legacy logic without level translation.
Package and mounting
Housed in a 16-SOIC (0.154" body width, 3.90 mm) — a common footprint that fits standard pick-and-place and reflow profiles. The tube shipment suits low-to-medium volume builds; for reel quantities, confirm the tape-and-reel suffix variant if your line runs high volume.
Lifecycle and compliance
Listed as Active with ROHS3 compliance. The LTC1689IS#PBF is the lead-free, RoHS-compliant ordering code; verify your internal BOM matches this suffix for Pb-free assembly.