1. SP483EEN-L/TR Substitution Conclusion Direct substitution is not recommended, or it should be considered only in non‑critical applications with a well‑controlled noise environment after thorough evaluation. The key differences are a substantial reduction in receiver hysteresis—from 70 mV in the original part to only 20 mV—and the lack of a clear “Automotive” grade qualification. A receiver with lower hysteresis voltage exhibits significantly degraded noise immunity (noise margin). In electrically complex environments with common‑mode noise, ground‑potential differences, or signal ringing, this makes the device more susceptible to false triggering due to interference, leading to an increased communication error rate. Although the basic communication protocol, data rate, supply voltage, and package are identical to the original, using it as a drop‑in replacement carries risk in applications where high reliability is required—especially where the original design may have relied on the higher hysteresis typical of industrial or automotive environments.