74HC2G66GD,125 Equivalent & Substitute Parts

Part Overview

The 74HC2G66GD,125 is a 2-circuit IC switch with SPST-NO (Single Pole Single Throw - Normally Open) configuration manufactured by Nexperia USA Inc. This component operates as a 1:1 multiplexer/demultiplexer with 70Ohm on-state resistance and is designed for high-speed switching applications up to 200MHz. The part is classified as Obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity. Current inventory of 2802 pieces is available as new original stock.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC2G66GD,125
Manufacturer	Nexperia USA Inc.
Category	Interface
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	70Ohm
Channel-to-Channel Matching (ΔRon)	3Ohm
Supply Voltage Range (Single)	2V ~ 10V
Switch Time (Ton, Toff) Max	20ns, 27ns
-3dB Bandwidth	200MHz
Leakage Current (IS(off)) Max	1µA
Crosstalk	-60dB @ 1MHz
Operating Temperature Range	-40°C ~ 125°C (TA)
Package / Case	8-XFDFN
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC2G66GD,125 is determined by the following critical parameters:

Switch Circuit Configuration: SPST - NO topology with 2 circuits in 1:1 multiplexer/demultiplexer arrangement
Electrical Performance: On-state resistance of 70Ohm maximum, channel matching within 3Ohm, switching speed (Ton/Toff) of 20ns/27ns maximum
Frequency Response: -3dB bandwidth of 200MHz minimum
Signal Integrity: Crosstalk specification of -60dB @ 1MHz or better
Supply Voltage Compatibility: Single supply operation from 2V to 10V
Leakage Current: Maximum 1µA at off-state
Environmental Specifications: Operating temperature range -40°C to 125°C, RoHS3 compliance, MSL Level 1

The primary substitute identified is the 74HC2G66DC,125, which maintains identical electrical specifications and base product lineage while differing only in package format and product status classification.

Parameter Comparison

Parameter	74HC2G66GD,125 (Main Part)	74HC2G66DC,125 (Substitute)
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.
Base Product Number	74HC2G66	74HC2G66
Switch Circuit Type	SPST - NO	SPST - NO
Number of Circuits	2	2
Multiplexer/Demultiplexer Configuration	1:1	1:1
On-State Resistance (Max)	70Ohm	70Ohm
Channel-to-Channel Matching (ΔRon)	3Ohm	3Ohm
Supply Voltage Range (Single)	2V ~ 10V	2V ~ 10V
Switch Time (Ton, Toff) Max	20ns, 27ns	20ns, 27ns
-3dB Bandwidth	200MHz	200MHz
Leakage Current (IS(off)) Max	1µA	1µA
Crosstalk	-60dB @ 1MHz	-60dB @ 1MHz
Operating Temperature Range	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-XFDFN	8-VFSOP (0.091", 2.30mm Width)
Supplier Device Package	8-XSON (2x3)	8-VSSOP
Packaging Format	Not specified	Tape & Reel (TR)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 74HC2G66DC,125 is the direct functional equivalent for the obsolete 74HC2G66GD,125. Both parts share identical electrical specifications, operating parameters, and compliance certifications (ROHS3, REACH Unaffected). The substitute maintains the same base product lineage (74HC2G66) and is manufactured by the same supplier.

The primary distinction is packaging format: the main part uses 8-XSON (2x3) while the substitute uses 8-VSSOP. This package difference requires PCB layout modification but does not affect electrical performance or functional compatibility.

The 74HC2G66DC,125 carries Active product status with 3861 pieces available as new original stock, providing superior long-term availability compared to the Obsolete main part. Both parts meet identical environmental and compliance requirements for -40°C to 125°C operation.

Frequently Asked Questions (FAQ)

Q: Can the 74HC2G66DC,125 directly replace the 74HC2G66GD,125 without circuit modification?

A: Electrical and functional replacement is direct. PCB layout modification is required due to package format differences (8-XSON vs. 8-VSSOP). Pin assignments and electrical characteristics are identical.

Q: What is the primary reason for substitution?

A: The 74HC2G66GD,125 is classified as Obsolete. The 74HC2G66DC,125 is an Active product with equivalent specifications and superior availability.

Q: Are there compliance or environmental differences between these parts?

A: No. Both parts are ROHS3 Compliant, REACH Unaffected, and rated for -40°C to 125°C operation with MSL Level 1 (Unlimited moisture sensitivity).

Q: What are the critical electrical parameters that must match for substitution?

A: On-state resistance (70Ohm), channel matching (3Ohm), switching speed (20ns/27ns), bandwidth (200MHz), leakage current (1µA), and crosstalk (-60dB @ 1MHz) must remain constant.

Q: Does the package change affect signal integrity?

A: Both packages are surface-mount 8-pin configurations with identical electrical specifications. Package geometry differs, requiring PCB redesign but not affecting electrical performance within specified parameters.

Q: What supply voltage range is supported?

A: Both parts operate with single supply from 2V to 10V, maintaining identical voltage specifications across the substitution.

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