SN74LVC1G66DCKJ Equivalent & Substitute Parts

Part Overview

The SN74LVC1G66DCKJ is a single-circuit SPST (Single Pole Single Throw) analog switch manufactured by Texas Instruments, designed for low-voltage signal routing applications. 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) form factor. The part is currently classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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	-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 eligibility for the SN74LVC1G66DCKJ is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit type: SPST - NO configuration
Circuit count: Single circuit (1:1 multiplexing)
Package compatibility: 5-TSSOP / SC-70-5 / SOT-353 form factor
On-state resistance: Maximum 10Ohm (allows lower resistance alternatives)
Supply voltage range: Minimum 1.65V support required
Operating temperature: -40°C to 85°C minimum coverage

Substitution Categories:

Direct Parametric Equivalents (Texas Instruments 74LVC series): SN74LVC1G66DCKR and SN74LVC1G66DCKT maintain identical electrical specifications with the main part, differing only in packaging format (Cut Tape vs. Tape & Reel) and product status. These are pin-compatible and functionally interchangeable.

Manufacturer-Recommended Alternatives (Lower On-State Resistance): ADG741BKSZ5-REEL7 (Analog Devices, 3Ohm) and MAX4707EXK+T (Maxim Integrated, 3Ohm) provide superior on-state resistance performance while maintaining the same package, supply voltage range, and operating temperature specifications. These are suitable for applications requiring lower insertion loss.

Manufacturer-Recommended Alternatives (Extended Temperature Range): M74VHC1GT66DFT1G and M74VHC1GT66DFT2G (onsemi, 40Ohm) support extended operating temperatures (-55°C to 125°C) and are functionally compatible, though with higher on-state resistance and lower bandwidth (180MHz vs. 300MHz).

Manufacturer-Recommended Alternatives (Automotive Grade): 74HCT1G66GW-Q100H (Nexperia, 95Ohm) is AEC-Q100 qualified for automotive applications with extended temperature range (-40°C to 125°C), though with significantly higher on-state resistance and narrower supply voltage range (4.5V ~ 5.5V).

Manufacturer-Recommended Alternatives (Ultra-Low Voltage): ISL43L110IHZ-T (Renesas, 220mOhm typical) supports lower minimum supply voltage (1.1V) and is suitable for battery-powered applications, though with higher leakage current (30nA) and different charge injection characteristics.

Manufacturer-Recommended Alternatives (Maxim Integrated Series): MAX4594EXK+T and MAX4596EXK+T both provide 10Ohm on-state resistance matching the original part with identical package and supply voltage specifications, offering active product status and higher inventory availability.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Supply Voltage (V+)	Switch Time Ton/Toff (Max)	-3dB Bandwidth	Leakage Current (Max)	Operating Temp	Product Status	Package
SN74LVC1G66DCKJ	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	100nA	-40°C ~ 85°C	Obsolete	SC-70-5
SN74LVC1G66DCKR	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	100nA	-40°C ~ 85°C	Active	SC-70-5
SN74LVC1G66DCKT	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	100nA	-40°C ~ 85°C	Last Time Buy	SC-70-5
ADG741BKSZ5-REEL7	Analog Devices Inc.	3Ohm	1.8V ~ 5.5V	12ns / 8ns (Typ)	200MHz	250pA	-40°C ~ 85°C	Active	SC-70-5
MAX4707EXK+T	Analog Devices Inc./Maxim	3Ohm	1.8V ~ 5.5V	20ns / 15ns	190MHz	1nA	-40°C ~ 85°C	Active	SC-70-5
MAX4594EXK+T	Analog Devices Inc./Maxim	10Ohm	2V ~ 5.5V	35ns / 40ns	300MHz	500pA	-40°C ~ 85°C	Active	SC-70-5
MAX4596EXK+T	Analog Devices Inc./Maxim	10Ohm	2V ~ 5.5V	35ns / 40ns	300MHz	500pA	-40°C ~ 85°C	Active	SC-70-5
M74VHC1GT66DFT2G	onsemi	40Ohm	2V ~ 5.5V	—	180MHz	100nA	-55°C ~ 125°C	Obsolete	SC-70-5
74HCT1G66GW-Q100H	Nexperia USA Inc.	95Ohm	4.5V ~ 5.5V	30ns / 44ns	200MHz	1µA	-40°C ~ 125°C	Active	5-TSSOP
ISL43L110IHZ-T	Renesas Electronics	220mOhm (Typ)	1.1V ~ 4.5V	15ns / 10ns	—	30nA	-40°C ~ 85°C	Active	SC-70-5

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): SN74LVC1G66DCKR is the primary recommendation as an active-status direct equivalent. It maintains all electrical and thermal specifications of the obsolete SN74LVC1G66DCKJ while offering superior inventory availability (6,904 units in stock). The only difference is packaging format (Cut Tape & Digi-Reel vs. original packaging), which does not affect electrical performance.

For High-Volume Production (Extended Inventory): SN74LVC1G66DCKT provides the largest available inventory (350,595 units) with identical electrical specifications. This part carries Last Time Buy status, making it suitable for long-term stockpiling if procurement windows are limited. Tape & Reel packaging is standard for automated assembly processes.

For Low-Resistance Applications: ADG741BKSZ5-REEL7 and MAX4707EXK+T both offer 3Ohm on-state resistance, reducing insertion loss by 70% compared to the original 10Ohm specification. Both maintain active product status, identical package form factor, and compatible operating temperature ranges. ADG741BKSZ5-REEL7 provides superior leakage current performance (250pA vs. 1nA), while MAX4707EXK+T offers lower leakage (1nA) and faster switching times.

For Matched Electrical Performance (Active Status): MAX4594EXK+T and MAX4596EXK+T provide identical 10Ohm on-state resistance and 300MHz bandwidth with active product status and high inventory levels (1,254 and 3,800 units respectively). These are suitable for direct substitution in new designs where the original part is unavailable.

For Automotive Applications: 74HCT1G66GW-Q100H is AEC-Q100 qualified and supports extended operating temperature (-40°C to 125°C). However, the 95Ohm on-state resistance and narrower supply voltage range (4.5V ~ 5.5V minimum) require circuit validation before deployment.

For Ultra-Low Voltage Systems: ISL43L110IHZ-T supports minimum supply voltage of 1.1V, making it suitable for battery-powered and energy-harvesting applications. The 220mOhm on-state resistance and MSL 2 moisture sensitivity level require design consideration for specific use cases.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC1G66DCKR be used as a direct drop-in replacement for SN74LVC1G66DCKJ?

A: Yes. SN74LVC1G66DCKR is a parametric equivalent with identical electrical specifications, operating temperature range, supply voltage range, and package form factor. The only difference is packaging format (Cut Tape & Digi-Reel vs. original packaging), which does not affect circuit performance. Pin configuration and functional behavior are identical.

Q: What is the difference between SN74LVC1G66DCKT and SN74LVC1G66DCKR?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: DCKT uses Tape & Reel (TR) packaging suitable for high-volume automated assembly, while DCKR uses Cut Tape (CT) & Digi-Reel packaging. DCKT offers significantly higher inventory availability (350,595 units vs. 6,904 units) but carries Last Time Buy status.

Q: Why do some substitute parts have lower on-state resistance?

A: Lower on-state resistance (3Ohm vs. 10Ohm) reduces insertion loss and signal attenuation in analog switching applications. Parts like ADG741BKSZ5-REEL7 and MAX4707EXK+T provide this performance improvement while maintaining the same package and supply voltage specifications. Selection depends on whether your application requires lower insertion loss.

Q: Can I use 74HCT1G66GW-Q100H as a substitute?

A: 74HCT1G66GW-Q100H is functionally compatible but has significant trade-offs: 95Ohm on-state resistance (9.5× higher than the original), narrower supply voltage range (4.5V ~ 5.5V minimum vs. 1.65V), and lower bandwidth (200MHz vs. 300MHz). It is suitable only for applications where these specifications are acceptable, particularly automotive designs requiring AEC-Q100 qualification.

Q: What does "Last Time Buy" status mean for SN74LVC1G66DCKT?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. While 350,595 units are currently in stock, no future production is planned. This part is suitable for long-term procurement if you can absorb the full inventory requirement, but active-status alternatives like SN74LVC1G66DCKR are recommended for new designs.

Q: Is ISL43L110IHZ-T suitable for my application?

A: ISL43L110IHZ-T is suitable if your application requires ultra-low supply voltage operation (1.1V minimum). However, the 220mOhm on-state resistance is significantly higher than the original 10Ohm specification, and MSL 2 moisture sensitivity requires stricter handling during assembly. Evaluate whether these trade-offs align with your circuit requirements.

Q: Do all substitute parts have the same package compatibility?

A: All listed substitutes use the 5-TSSOP / SC-70-5 / SOT-353 package family, ensuring mechanical and electrical pin compatibility. However, verify PCB footprint compatibility with your specific design, as minor dimensional variations may exist between package designations.

Q: Which substitute offers the best inventory availability?

A: SN74LVC1G66DCKT provides the highest inventory (350,595 units), followed by M74VHC1GT66DFT2G (521,400 units). However, M74VHC1GT66DFT2G is obsolete status. For active-status parts with high availability, SN74LVC1G66DCKR (6,904 units) and MAX4596EXK+T (3,800 units) are recommended.

Q: What is the impact of higher leakage current in substitute parts?

A: Higher leakage current (e.g., 1µA in 74HCT1G66GW-Q100H vs. 100nA in the original) increases power consumption in off-state and may introduce noise in sensitive analog circuits. For low-power or high-impedance applications, parts with lower leakage (ADG741BKSZ5-REEL7 at 250pA or MAX4707EXK+T at 1nA) are preferable.

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