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SN54HC366: SN54HC366

Michael Zagnacky
Prodigy 10 points
Part Number: SN54HC366
Other Parts Discussed in Thread: CD54HC366, SN54LS366A,

Westinghouse has used the obsolete SN54366AJ.  That part is still required in some of our "legacy" products.

We are looking at using the SN54HC366J which appears to be available at Rochester Electronics.

Is the SN54HC366J a viable alternate to the SN54366AJ?

Or can TI recommend a drop-in replacement (equivalent or better) for the SN54366AJ?

  • 0
    TI__Guru 62930 points
    Michael,
    I took a look at what we have and compared some of the key spec's.
    There are several options. The SN54LS366A, SN54HC366, CD54HC366 . Package and functionality the same, but not same performance specifications.
    SN54366A vs SN54LS366A
    VIl 0.8 vs 0.7v
    IOH -2 vs -1ma
    IOL 32 vs 12ma
    leakage improves
    Icc improves
    Prop delays similar, but loading is lighter for the LS 400 vs 667ohm

    SN54366A vs SN54HC366 and CD54HC366
    The HC devices are CMOS vs TTL levels
    Outputs will still will meets TTL levels if IOL <=6mA
    inputs would need to be verified, as CMOS will require ~ 0.7VCC VIH, and 0.3VCC VIL levels. This is significantly different than the TTL requirements of 2 and 0.8V.
    Delays are longer, and even lighter loads

    The SN54LS366A could be the best option, as long as the loads are not too heavy and will slow device down, or cause it to fail to output proper Voh/vol levels. This device will be somewhat slower when compared to same loads, so there will need to be some margin on timing to allow this swap. The IOL level is 12ma vs 32, so as mentioned, if larger load (resistive or capacitive), it will suffer longer delays or fail to meet VOL.

    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade