SN74LVC1G66DSF2 Equivalent & Substitute Parts

Part Overview

The SN74LVC1G66DSF2 is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) IC switch manufactured by Texas Instruments, part of the 74LVC series. This component functions as an analog switch with a maximum on-state resistance of 10Ohm and operates across a supply voltage range of 1.65V to 5.5V. The device is packaged in a 6-SON (1x1) surface mount configuration.

The SN74LVC1G66DSF2 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this specific packaging variant (Digi-Reel®). Finding equivalent substitute parts is necessary to maintain design continuity and ensure long-term component availability for production and maintenance applications.

Substiute Parts

SN74LVC1G66DSF2

Texas InstrumentsIn Stock: 3495SN74LVC1G66DSF2 Datasheet

Current PartRFQ

SN74LVC1G66DSFR

Texas InstrumentsIn Stock: 16213SN74LVC1G66DSFR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LVC1G66DSF2 is determined by strict equivalence across the following critical parameters:

• Switch Circuit Configuration: SPST - NO topology
• Circuit Count: Single circuit (1:1 multiplexer/demultiplexer)
• On-State Resistance: Maximum 10Ohm
• Supply Voltage Range: 1.65V ~ 5.5V
• Switch Timing: Ton (Max) 4.2ns, Toff (Max) 5ns
• Bandwidth: 300MHz (-3dB)
• Channel Capacitance: 6pF (CS(off), CD(off))
• Leakage Current: 100nA (IS(off)) maximum
• Operating Temperature Range: -40°C ~ 85°C
• Package Type: 6-SON (1x1) surface mount
• Compliance: ROHS3 Compliant, REACH Unaffected

The primary distinction between the main part and its substitute lies in packaging format: the SN74LVC1G66DSF2 uses Digi-Reel® packaging (Last Time Buy status), while the substitute employs standard Tape & Reel (TR) packaging with Active product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LVC1G66DSFR is a direct parametric equivalent to the SN74LVC1G66DSF2. Both parts share identical electrical and mechanical specifications, including switch topology, on-state resistance, supply voltage range, switching characteristics, and thermal operating range.

The SN74LVC1G66DSFR is the recommended substitute due to its Active product status, ensuring continued availability and long-term supply chain stability. The SN74LVC1G66DSF2, designated as Last Time Buy, will reach end-of-life and become unavailable for future procurement.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The packaging difference (Digi-Reel® versus Tape & Reel) does not affect component functionality or performance; this distinction pertains only to supply format and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC1G66DSFR be used as a direct replacement for the SN74LVC1G66DSF2?

A: Yes. Both parts are electrically and mechanically identical. All functional parameters, including switch circuit type, on-state resistance, supply voltage range, switching speed, bandwidth, and operating temperature range are equivalent. The only difference is packaging format (Digi-Reel® versus Tape & Reel) and product lifecycle status.

Q: What is the significance of the Last Time Buy status on the SN74LVC1G66DSF2?

A: Last Time Buy indicates that Texas Instruments has discontinued this specific part variant and will no longer manufacture it after a defined cutoff date. Existing inventory will be depleted, and the part will become unavailable for new orders. Transition to the SN74LVC1G66DSFR is necessary for ongoing production requirements.

Q: Are there any performance differences between these two parts?

A: No. Both parts deliver identical electrical performance across all specified parameters: 10Ohm maximum on-state resistance, 1.65V to 5.5V supply voltage operation, 4.2ns and 5ns switching times, 300MHz bandwidth, and 100nA maximum leakage current.

Q: Does the packaging format affect PCB design or assembly?

A: No. Both parts use the same 6-SON (1x1) surface mount package with 6-XFDFN case designation. PCB footprints, solder pad layouts, and assembly procedures remain identical. The packaging format difference (Digi-Reel® versus Tape & Reel) affects only component supply and handling, not board-level integration.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the SN74LVC1G66DSF2 and SN74LVC1G66DSFR are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for industrial and commercial applications.

Q: Which part should be selected for new designs?

A: The SN74LVC1G66DSFR should be selected for new designs. Its Active product status ensures long-term availability and supply chain continuity. The SN74LVC1G66DSF2 should be used only for existing inventory management or legacy system maintenance.