The 8-SOIC footprint is a common board-level package for signal-conditioning blocks near connectors or FPGAs.
2/0 driver/receiver count — pure driver, no receive path
With two drivers and zero receivers, this is a transmit-only device. It cannot be used as a transceiver or receiver. If your design needs bidirectional LVDS, look for a part with at least one receiver on-chip. For a pure-driver application like driving a display link or a single-ended-to-differential conversion stage, this fits cleanly.
TI lists the SN75LVDS9638DRG4 as Obsolete. No last-time-buy window remains through the factory channel. Independent distribution holds remaining inventory — date codes vary, and counterfeit screening is essential before reflow. For new designs or production fills, the SN75LVDS9638D (non-tape-and-reel suffix) is the same die in the same package, but also obsolete. Verify the operating temperature range against your system ambient before substituting.
At 155 Mbps, the output transition time is fast enough that PCB layout matters: keep the differential pair impedance matched to the cable or backplane (typically 100 Ω), minimise stub lengths, and place the driver within a few centimetres of the connector. The commercial temperature range limits use to controlled indoor environments — not suitable for automotive or outdoor telecom without active cooling.