Diodes Incorporated
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PI3B3257A (Obsolete)

3.3V Quad 2:1 Multiplexer/Demultiplexer

NOTE: Datasheet may not yet reflect updated package obsolescence/phase out status or Package Drawing. Please refer to the BUY NOW tab for the most up to date package options and drawings. Please refer to PCN/PDN tabs for most current package obsolescence/phase out status.
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Product Description

The PI3B3257A is a 3.3 Volt, Quad 2:1 multiplexer/demultiplexer with three-state outputs that is pinout and function compatible with the PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be connected to outputs with low On-Resistance (5Ω) with no additional ground bounce noise or propagation delay.


  • Near-Zero propagation delay
  • 5Ω switches connect inputs to outputs
  • Fast Switching Speed: 4.8ns max.
  • Ultra-Low Quiescent Power: 0.1μA typical
    • Ideally suited for notebook applications
  • Pin compatible with 74 series 257 logic devices
  • Packaging (Pb-free & Green):
    • 16-pin 150 mil wide plastic QSOP (Q)

Product Specifications

Product Parameters

Configuration Mux: Quad 2-Channel
Differential Channels N/A
HotInsertion 0
Lanes N/A
OtherFeatures N/A
RailToRail 0
Signal Type Single Ended
Single Ended Channels 2
Type N/A
Voltage 3.3

Technical Documents

Recommended Soldering Techniques