Skip to main content
Log in
Renesas Electronics 74FST3245Q — Logic ICs

74FST3245Q Bus Switch, 8 x 1:1, 20-QSOP, Active

MPN74FST3245Q
End of Life

Fairchild 74FST3245Q Bus Switch, 8 x 1:1 circuit, 4.75V ~ 5.25V supply, Single Supply, -40°C ~ 85°C, 20-QSOP package, Surface Mount, Active.

$0.2Ref. price · indicative, final on quote
Renesas Electronics 74FST3245Q datasheet (PDF)
Packaging20-SSOP (0.154", 3.90mm Width)
RoHSRoHS non-compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

74FST3245Q specifications
ParameterValue
TypeBus Switch
MountingSurface Mount
Supply voltage4.75V ~ 5.25V
Voltage supply sourceSingle Supply
Operating temperature-40°C ~ 85°C
Circuit8 x 1:1
PackageBulk
Case20-SSOP (0.154\", 3.90mm Width)
Independent circuits1

Product details

Bus switch for 5 V signal isolation

The Fairchild 74FST3245Q is an 8-bit bus switch with a 1:1 signal-path configuration, designed to connect or isolate digital buses under logic control.

Package options and footprint match

Surface-mount assembly, no exposed pad. MSL level is not in the record, but a standard 20-pin QSOP typically runs MSL 1; the buyer should confirm with the date-code trace if the reel has been open.

Independent-distributor stock also turns regularly for spot fills. The RoHS compliance status is listed as non-compliant, which matters for EU RoHS-exempt or legacy builds — verify your exemption coverage before committing the BOM line.

Frequently asked questions

What is the exact function and package of 74FST3245Q?

The 74FST3245Q is an 8-bit bus switch with a 1:1 circuit configuration, used to connect or isolate digital buses.

Can 74FST3245Q be used as a drop-in replacement for 74FST3245?

The 74FST3245 base family includes both SSOP and QSOP package options. The 74FST3245Q is the QSOP variant. If your board is laid out for the SSOP footprint, the QSOP may not be a direct drop-in due to the narrower body width. Check the land pattern against the 20-QSOP dimensions before substituting.

Is 74FST3245Q compatible with 3.3 V logic?

No. Driving it from a 3.3 V rail would under-bias the internal switch pass gates, degrading on-resistance and signal integrity. A 3.3 V bus switch would need a different part number in the family.