74HC4351DB,118 Equivalent & Substitute Parts

Part Overview

The 74HC4351DB,118 is a single-circuit 8:1 multiplexer/demultiplexer switch IC manufactured by Nexperia USA Inc. in a 20-SSOP surface mount package. This component features 120Ohm on-state resistance and operates across a supply voltage range of 2V to 10V (single supply) or ±1V to ±5V (dual supply). The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	120Ohm
Channel-to-Channel Matching (ΔRon)	6Ohm
Voltage - Supply, Single (V+)	2V ~ 10V
Voltage - Supply, Dual (V±)	±1V ~ 5V
Switch Time (Ton, Toff) (Max)	55ns, 45ns
-3dB Bandwidth	170MHz
Channel Capacitance (CS(off), CD(off))	4.6pF
Current - Leakage (IS(off)) (Max)	100nA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HC4351DB,118 is determined by the following critical parameters:

Multiplexer Configuration: 8:1 topology (non-negotiable)
Number of Circuits: Single circuit (1)
On-State Resistance: 120Ohm maximum
Supply Voltage Compatibility: 2V ~ 10V single supply operation
Switching Performance: 55ns/45ns maximum switching times
Bandwidth: 170MHz -3dB bandwidth
Operating Temperature Range: -40°C ~ 125°C
Surface Mount Packaging: 20-pin package variants
Compliance: ROHS3 Compliant, MSL Level 1

The 74HC4351PWJ qualifies as a direct substitute based on matching all critical electrical parameters and maintaining functional equivalence within the 74HC4351 base product family. Package geometry differences (SSOP vs. TSSOP) represent the primary physical distinction.

Parameter Comparison

Parameter	74HC4351DB,118	74HC4351PWJ	Match Status
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Identical
Base Product Number	74HC4351	74HC4351	Identical
Multiplexer/Demultiplexer Circuit	8:1	8:1	Identical
Number of Circuits	1	1	Identical
On-State Resistance (Max)	120Ohm	120Ohm	Identical
Channel-to-Channel Matching (ΔRon)	6Ohm	8Ohm	Compatible (within tolerance)
Voltage - Supply, Single (V+)	2V ~ 10V	2V ~ 10V	Identical
Voltage - Supply, Dual (V±)	±1V ~ 5V	Not specified	Main part advantage
Switch Time (Ton, Toff) (Max)	55ns, 45ns	55ns, 45ns	Identical
-3dB Bandwidth	170MHz	170MHz	Identical
Channel Capacitance (CS(off), CD(off))	4.6pF	4.6pF	Identical
Current - Leakage (IS(off)) (Max)	100nA	100nA	Identical
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	Different package geometry
Product Status	Obsolete	Active	Substitute is active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

The 74HC4351PWJ is the recommended substitute for the obsolete 74HC4351DB,118 based on the following factors:

Electrical Equivalence: All critical electrical parameters match or exceed the original specification. The channel-to-channel matching tolerance (ΔRon) of 8Ohm on the substitute is within acceptable variance compared to the 6Ohm specification of the main part.

Product Status: The 74HC4351PWJ maintains active product status with Nexperia USA Inc., ensuring continued availability and manufacturing support. The original 74HC4351DB,118 is classified as obsolete.

Compliance Certification: Both parts maintain identical ROHS3 compliance and MSL Level 1 ratings, confirming equivalent environmental and regulatory standing.

Package Consideration: The primary physical difference is the package variant. The 74HC4351PWJ uses a 20-TSSOP package (0.173" width) compared to the 20-SSOP package (0.209" width) of the original part. This represents a narrower package footprint and requires PCB layout verification for pin-to-pin compatibility and trace routing accommodation.

Supply Voltage: The main part specifies dual supply operation (±1V ~ 5V), which is not documented for the substitute. Applications requiring dual supply operation must confirm compatibility through the substitute's detailed datasheet.

Frequently Asked Questions (FAQ)

Q: Can the 74HC4351PWJ directly replace the 74HC4351DB,118 without PCB modifications?

A: Electrical substitution is valid. However, the package geometry differs (TSSOP vs. SSOP). PCB layout modifications may be required due to the narrower package width (4.40mm vs. 5.30mm). Pin pitch and lead configuration must be verified against the PCB footprint design.

Q: What is the significance of the channel-to-channel matching (ΔRon) difference between 6Ohm and 8Ohm?

A: The 74HC4351PWJ exhibits a 2Ohm wider matching tolerance. For applications where precise channel-to-channel resistance uniformity is critical, this difference must be evaluated against system performance requirements. For most general-purpose multiplexing applications, this variance is acceptable.

Q: Is the 74HC4351PWJ suitable for applications requiring dual supply voltage operation?

A: The substitute part does not specify dual supply voltage capability (±1V ~ 5V). If the original design relies on dual supply operation, the substitute's datasheet must be consulted to confirm compatibility. Single supply operation (2V ~ 10V) is confirmed for both parts.

Q: What are the packaging implications of switching from SSOP to TSSOP?

A: TSSOP (Thin Shrink Small Outline Package) offers a narrower body width than SSOP (Shrink Small Outline Package). Both maintain 20-pin configurations with identical pin counts. PCB footprint libraries must be updated, and trace routing must accommodate the reduced package width. Lead spacing and solder pad dimensions require verification.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts maintain identical ROHS3 compliance, MSL Level 1 ratings, and REACH unaffected status. No compliance or certification differences exist between the 74HC4351DB,118 and 74HC4351PWJ.

Q: Why is the 74HC4351DB,118 classified as obsolete?

A: The original part is obsolete due to product lifecycle management by Nexperia USA Inc. The 74HC4351PWJ represents the active continuation of the 74HC4351 product family and is the recommended replacement for new designs and production continuity.

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