Texas Instruments SN74S251N3, 74S series 8-line input multiplexer, through-hole package, active production, RoHS non-compliant.
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The Texas Instruments SN74S251N3 is an 8-line input multiplexer from the 74S Schottky TTL family. It selects one of eight data sources and routes it to a single output, a common function in data-routing, address decoding, and signal-switching applications in legacy digital systems.
This part is RoHS non-compliant, meaning it uses lead-bearing solder terminations.
The SN74S251N3 is an 8-line input multiplexer. It selects one of eight input signals and routes it to a single output, controlled by a three-bit address. It is used in data routing, address decoding, and signal selection in TTL logic systems.
No direct pin-compatible equivalent is listed on this record. The SN74LS348N is a related 74-series priority encoder (1 x 8:3) but it performs a different logic function and operates over a 0°C to 70°C temperature range — it is not a multiplexer substitute.
No, the SN74S251N3 is RoHS non-compliant. It contains lead in its solder terminations and is not suitable for lead-free assembly processes without a waiver.