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The MC74VHC1G66DFT1 is a single-channel SPST normally open analog switch manufactured by onsemi using high-speed CMOS technology. It operates within a supply voltage range of 2V to 5.5V and features a maximum on-resistance of 40 ohms. The device provides a -3dB bandwidth of 180MHz and supports an output current of 8mA. It is housed in a SC-88A (SOT-353) surface-mount package with five terminals. The component functions as a 1:1 multiplexer/demultiplexer circuit and is rated for operation between -55°C and +125°C.
Verify the specific suffix DFT1 against the manufacturer's official datasheet to confirm the SC-88A package type and tape-and-reel orientation. Confirm RoHS compliance status, as historical data indicates variations across the VHC1GT66 family. Ensure the source document matches the exact part number to avoid confusion with similar variants like MC74VHC1GT66DTT1.
Select this component when a single-pole single-throw switching function is required for signals up to 180MHz. The 2V to 5.5V operating range makes it suitable for low-voltage digital systems. Compare the 40-ohm on-resistance against load requirements to ensure signal integrity. Verify that the SC-88A footprint fits the PCB layout constraints.
This part belongs to the onsemi 74VHC logic family, which combines high-speed CMOS performance with standard TTL-compatible inputs. The MC74VHC1G66 series specifically addresses applications requiring small form-factor analog switching. It serves as a compact solution for managing signal paths in portable and space-constrained electronic designs.
The MC74VHC1GT66DFT1 is a direct pin-compatible alternative within the same manufacturer's portfolio. Other manufacturers offer similar SPST switches, but verification of pinout and electrical parameters is required before substitution.