SN74LVC1G66DCKT Equivalent & Substitute Parts

Part Overview

The SN74LVC1G66DCKT is a single-circuit SPST (Single Pole Single Throw) analog switch manufactured by Texas Instruments in the 74LVC logic family. This device features a 10Ohm on-state resistance, operates across a 1.65V to 5.5V supply range, and is packaged in a 5-TSSOP (SC-70-5) surface-mount configuration. The part is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Normally Open)
Number of Circuits	1
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	10Ohm
Supply Voltage Range (V+)	1.65V ~ 5.5V
Switch Time (Ton/Toff Max)	4.2ns / 5ns
-3dB Bandwidth	300MHz
Channel Capacitance (Off-State)	6pF
Leakage Current (Max)	100nA
Operating Temperature Range	-40°C ~ 85°C
Package Type	5-TSSOP / SC-70-5 / SOT-353
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74LVC1G66DCKT is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit type: SPST - NO configuration
Circuit count: Single circuit (1:1 multiplexer/demultiplexer)
Package compatibility: 5-TSSOP / SC-70-5 / SOT-353 surface-mount
On-state resistance tolerance: Maximum 10Ohm (allows lower resistance alternatives)
Supply voltage range: Minimum 1.65V support required
Operating temperature: -40°C minimum support required

Acceptable Variation Parameters:

On-state resistance values lower than 10Ohm are acceptable (improved performance)
Supply voltage ranges that encompass 1.65V ~ 5.5V are acceptable
Switch time specifications may vary within application requirements
Bandwidth specifications may vary provided minimum 180MHz is maintained
Leakage current specifications may vary

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications, different packaging) and manufacturer-recommended alternatives (functionally compatible with allowable parameter variations).

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Supply Voltage (V+)	Switch Time Ton/Toff (Max)	-3dB Bandwidth	Leakage Current (Max)	Operating Temp	Package	Product Status
SN74LVC1G66DCKT	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	100nA	-40°C ~ 85°C	SC-70-5	Last Time Buy
SN74LVC1G66DCKR	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	100nA	-40°C ~ 85°C	SC-70-5	Active
74LVC1G66GW,125	Nexperia USA Inc.	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	500MHz	5µA	-40°C ~ 125°C	5-TSSOP	Active
74HCT1G66GW-Q100H	Nexperia USA Inc.	95Ohm	4.5V ~ 5.5V	30ns / 44ns	200MHz	1µA	-40°C ~ 125°C	5-TSSOP	Active (AEC-Q100)
ADG741BKSZ5-REEL7	Analog Devices Inc.	3Ohm	1.8V ~ 5.5V	12ns / 8ns (Typ)	200MHz	250pA	-40°C ~ 85°C	SC-70-5	Active
ISL43L110IHZ-T	Renesas Electronics Corporation	220mOhm (Typ)	1.1V ~ 4.5V	15ns / 10ns	—	30nA	-40°C ~ 85°C	SC-70-5	Active
MAX4594EXK+T	Analog Devices Inc./Maxim Integrated	10Ohm	2V ~ 5.5V	35ns / 40ns	300MHz	500pA	-40°C ~ 85°C	SC-70-5	Active
MAX4596EXK+T	Analog Devices Inc./Maxim Integrated	10Ohm	2V ~ 5.5V	35ns / 40ns	300MHz	500pA	-40°C ~ 85°C	SC-70-5	Active
MAX4707EXK+T	Analog Devices Inc./Maxim Integrated	3Ohm	1.8V ~ 5.5V	20ns / 15ns	190MHz	1nA	-40°C ~ 85°C	SC-70-5	Active
M74VHC1GT66DFT1G	onsemi	40Ohm	2V ~ 5.5V	—	180MHz	100nA	-55°C ~ 125°C	SC-70-5	Obsolete
M74VHC1GT66DFT2G	onsemi	40Ohm	2V ~ 5.5V	—	180MHz	100nA	-55°C ~ 125°C	SC-70-5	Obsolete

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): SN74LVC1G66DCKR is the direct parametric equivalent to SN74LVC1G66DCKT. Both devices share identical electrical specifications and package configuration. The only difference is packaging format: DCKR uses Cut Tape (CT) & Digi-Reel® while DCKT uses Tape & Reel (TR). SN74LVC1G66DCKR maintains Active product status, making it the preferred choice for new designs and ongoing procurement.

Active Alternatives with Enhanced Specifications: 74LVC1G66GW,125 (Nexperia) provides identical on-state resistance and supply voltage range with extended operating temperature to 125°C and improved bandwidth (500MHz). This part is suitable for applications requiring higher temperature operation.

74HCT1G66GW-Q100H (Nexperia) is AEC-Q100 qualified for automotive applications. It operates within a narrower supply range (4.5V ~ 5.5V) and exhibits higher on-state resistance (95Ohm), making it suitable only for 5V-centric designs with relaxed resistance requirements.

Low-Resistance Alternatives: ADG741BKSZ5-REEL7 (Analog Devices) and MAX4707EXK+T (Analog Devices/Maxim) both feature significantly lower on-state resistance (3Ohm), providing superior signal integrity for applications sensitive to switch resistance. Both support the full 1.65V minimum supply requirement.

Minimal-Resistance Alternative: ISL43L110IHZ-T (Renesas) offers the lowest on-state resistance at 220mOhm typical, with exceptionally low leakage current (30nA). However, its supply voltage range begins at 1.1V, which may not fully encompass the original part's 1.65V minimum specification.

Avoid in New Designs: M74VHC1GT66DFT1G and M74VHC1GT66DFT2G (onsemi) are marked Obsolete and should not be selected for new designs despite their availability in inventory.

Frequently Asked Questions (FAQ)

Q: Can I use 74HCT1G66GW-Q100H as a direct replacement for SN74LVC1G66DCKT? A: No. While both are SPST-NO single-circuit switches in compatible packages, the 74HCT1G66GW-Q100H has a narrower supply voltage range (4.5V ~ 5.5V versus 1.65V ~ 5.5V) and higher on-state resistance (95Ohm versus 10Ohm). Use this part only if your application operates exclusively at 5V and can tolerate the higher resistance.

Q: What is the difference between SN74LVC1G66DCKT and SN74LVC1G66DCKR? A: Both parts are electrically identical with the same specifications. The difference is packaging format: DCKT is supplied in Tape & Reel (TR) format, while DCKR is supplied in Cut Tape (CT) & Digi-Reel® format. DCKR is currently Active, making it the recommended choice.

Q: Are the low-resistance alternatives (3Ohm) compatible with my design? A: Low-resistance alternatives such as ADG741BKSZ5-REEL7 and MAX4707EXK+T are electrically compatible and provide improved performance in terms of signal integrity and reduced power dissipation. They are direct substitutes if your circuit design does not depend on the specific 10Ohm resistance value.

Q: Can I use parts with higher operating temperature ranges? A: Yes. Parts rated for higher temperature ranges (such as 74LVC1G66GW,125 rated to 125°C) are backward-compatible with designs requiring -40°C ~ 85°C operation. The extended temperature rating provides additional design margin.

Q: Why should I avoid M74VHC1GT66DFT2G despite its availability? A: M74VHC1GT66DFT2G is marked as Obsolete. While inventory may be available, obsolete parts carry risk of supply discontinuation and lack of manufacturer support. For new designs, select from Active status parts such as SN74LVC1G66DCKR or alternatives from Nexperia, Analog Devices, or Renesas.

Q: What is the significance of the SC-70-5 package designation? A: SC-70-5 is a 5-pin surface-mount package also known as 5-TSSOP or SOT-353. All listed substitutes use this same package family, ensuring mechanical and electrical compatibility without PCB redesign.

Q: Does leakage current variation affect substitution suitability? A: Leakage current variation is acceptable across substitutes. Lower leakage current (such as 1nA in MAX4707EXK+T versus 100nA in the original) improves performance. Higher leakage current is acceptable if your application does not depend on ultra-low off-state current.

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