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Texas Instruments SN74HCT645DWR — Logic ICs

SN74HCT645DWR 74HCT Transceiver, 5.5V 20-SOIC

MPNSN74HCT645DWR
End of Life

Texas Instruments 74HCT series SN74HCT645DWR, Transceiver, Non-Inverting, 1 Element, 8 bits per element, 3-State Output, 4.5V to 5.5V Supply, 6mA/6mA Output Current, –40°C to 85°C, 20-SOIC Package.

$1.79Ref. price · indicative, final on quote
Texas Instruments SN74HCT645DWR datasheet (PDF)
Packaging20-SOIC (0.295", 7.50mm Width)
RoHSROHS3 Compliant
Series74HCT
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HCT645DWR specifications
ParameterValue
Series74HCT
Logic typeTransceiver, Non-Inverting
Output type3-State
MountingSurface Mount
Supply voltage4.5V ~ 5.5V
Current - output high, low6mA, 6mA
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case20-SOIC (0.295\", 7.50mm Width)
Number of elements1
Number of bits per element8

Product details

8-bit bus transceiver in the 74HCT family

The SN74HCT645DWR: The wide-body 20-SOIC package (7.50mm width) matches the standard footprint for 20-pin SOIC bus transceivers.

Supply voltage: 5V only — not for 3.3V rails

The supply range is 4.5V to 5.5V, so this part is strictly for 5V logic systems. It cannot be used on a 3.3V bus without a level translator. If your design runs on 3.3V, look at the 74LVTH family (e.g., SN74LVTH16245A) which operates down to 2.7V.

Temperature grade: industrial range

Not qualified for full military range, but the industrial grade covers most commercial and light-industrial applications.

Frequently asked questions

Can SN74HCT645DWR work with 3.3V logic?

No. The supply voltage range is 4.5V to 5.5V, so it is designed for 5V systems only. For 3.3V operation, consider the 74LVTH family such as SN74LVTH16245ADGVR.

What are the equivalents for SN74HCT645DWR?

Functional equivalents in the same 8-bit transceiver class include the SN74ABT2245DW (32mA drive, 5V supply) and the SN74LVTH16245ADGVR (32mA drive, 2.7V to 3.6V supply).