74HC251DB-Q100J Equivalent & Substitute Parts

Part Overview

The 74HC251DB-Q100J is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This component is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across a 2V to 6V supply range with automotive-grade qualification (AEC-Q100) and ROHS3 compliance.

Substiute Parts

74HC251DB-Q100J

Nexperia USA Inc.In Stock: 79874HC251DB-Q100J Datasheet

Current PartRFQ

74HC251PW-Q100J

Nexperia USA Inc.In Stock: 112374HC251PW-Q100J Datasheet

SimilarRFQ

SN74HC251DBR

Texas InstrumentsIn Stock: 2315SN74HC251DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC251DB-Q100J is determined by the following critical parameters:

Functional Equivalence Requirements:

• Multiplexer type: 1 x 8:1 circuit configuration
• Base product number: 74HC251
• Logic family: 74HC series
• Supply voltage range: 2V ~ 6V (minimum overlap required)
• Package compatibility: 16-SSOP or 16-TSSOP footprints

Acceptable Variations:

• Manufacturer (Nexperia, Texas Instruments, Motorola/ON Semiconductor)
• Product status (Active preferred over Obsolete)
• Output current specifications (within automotive logic standards)
• Operating temperature range (minimum -40°C to +85°C acceptable)
• Packaging format (Tape & Reel acceptable for production environments)

Two substitute parts meet these criteria and are grouped by package type compatibility.

Parameter Comparison

Engineering Selection Recommendations

74HC251PW-Q100J (Nexperia): This substitute maintains identical electrical specifications and automotive qualification (AEC-Q100) as the main part. The primary difference is package format: 16-TSSOP versus 16-SSOP. This part is Active status, ensuring long-term availability. Selection is appropriate when PCB layout accommodates the narrower 4.40mm TSSOP footprint. Tape & Reel packaging supports high-volume production environments.

SN74HC251DBR (Texas Instruments): This substitute provides identical 16-SSOP package compatibility with the main part, enabling direct footprint replacement. Output current is higher (7.8mA versus 5.2mA), which is acceptable for 74HC logic applications. Operating temperature range is -40°C to +85°C, meeting standard industrial and automotive requirements. Active product status ensures availability. Automotive grade and AEC-Q100 qualification are not specified for this part; verification against specific application requirements is necessary if automotive certification is mandatory.

Frequently Asked Questions (FAQ)

Q: Can 74HC251PW-Q100J replace 74HC251DB-Q100J in existing designs?

A: Electrical substitution is valid. The 16-TSSOP package has a different footprint (0.173" width versus 0.209" width). PCB layout modification is required. Pin configuration and electrical function are identical.

Q: What is the difference between 16-SSOP and 16-TSSOP packages?

A: Both are 16-pin surface mount packages with identical pin pitch and electrical connectivity. TSSOP is a thinner, narrower variant (4.40mm versus 5.30mm width). TSSOP is preferred for space-constrained applications. Reflow soldering parameters may differ slightly.

Q: Is SN74HC251DBR suitable for automotive applications?

A: The part meets 74HC logic standards and operates across -40°C to +85°C. Automotive grade and AEC-Q100 qualification are not specified. Applications requiring explicit automotive certification should confirm compatibility with design specifications before selection.

Q: Why is the main part marked Obsolete?

A: Nexperia has transitioned the 74HC251DB-Q100J to end-of-life status. Active alternatives (74HC251PW-Q100J and SN74HC251DBR) provide equivalent functionality and are recommended for new designs and production continuity.

Q: Are there differences in output current between substitutes?

A: Yes. The main part and 74HC251PW-Q100J specify 5.2mA output current. SN74HC251DBR specifies 7.8mA. Both values are within 74HC logic family specifications. Circuit design should account for this difference if output current is a critical parameter.

Q: What compliance certifications apply to these parts?

A: All three parts are ROHS3 compliant and REACH unaffected. The main part and 74HC251PW-Q100J carry AEC-Q100 automotive qualification. SN74HC251DBR does not specify automotive qualification; verification is required for automotive applications.