74HC191DB,118 Equivalent & Substitute Parts

Part Overview

The 74HC191DB,118 is a 4-bit binary counter IC manufactured by Nexperia USA Inc., designed for synchronous counting applications with both up and down counting capability. This component operates at a maximum count rate of 39 MHz and supports supply voltages from 2 V to 6 V, making it suitable for digital logic circuits requiring precise counting functionality.

The 74HC191DB,118 is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance of systems utilizing this component.

Substiute Parts

74HC191DB,118

Nexperia USA Inc.In Stock: 71974HC191DB,118 Datasheet

Current PartRFQ

74HC191PW,118

Nexperia USA Inc.In Stock: 271774HC191PW,118 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC191DB,118 is determined by the following critical parameters that must remain consistent:

• Logic Function: Binary counter with 4-bit capacity, up/down counting direction
• Electrical Characteristics: 39 MHz count rate, 2 V to 6 V supply voltage range, -40°C to 125°C operating temperature
• Trigger and Reset Behavior: Positive edge trigger, asynchronous reset, synchronous timing
• Base Product Number: 74HC191 series designation
• Compliance Standards: ROHS3 compliance, REACH unaffected status

The 74HC191PW,118 qualifies as a direct substitute based on identical electrical specifications and functional parameters. The primary difference is the package type and product status, which affects availability and supply chain considerations.

Parameter Comparison

Engineering Selection Recommendations

The 74HC191PW,118 is the qualified substitute for the obsolete 74HC191DB,118. Both components maintain identical electrical and functional specifications, ensuring direct functional compatibility in circuit applications.

Product Status Consideration: The 74HC191DB,118 is obsolete, while the 74HC191PW,118 is active. Selection of the active substitute ensures long-term supply chain availability and ongoing manufacturer support.

Package Compatibility: The substitute uses a 16-TSSOP package (4.40mm width) compared to the original 16-SSOP package (5.30mm width). Both are surface mount packages with identical pin counts and electrical characteristics. PCB layout modifications may be required to accommodate the narrower package width.

Compliance Status: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

Packaging Format: The substitute is supplied in Tape & Reel format, which is standard for active production components and supports automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 74HC191PW,118 directly replace the 74HC191DB,118 in existing designs?

A: Yes, the 74HC191PW,118 provides functional equivalence. The electrical specifications, pin configuration, and logic behavior are identical. PCB layout modifications are necessary due to package width differences (16-TSSOP vs. 16-SSOP).

Q: What is the primary difference between these two parts?

A: The main differences are package type (16-TSSOP versus 16-SSOP), product status (active versus obsolete), and packaging format (Tape & Reel versus bulk). Electrical and functional specifications are identical.

Q: Are there any supply chain advantages to using the substitute?

A: Yes. The 74HC191PW,118 is an active product with higher inventory availability (2678 pcs in stock versus 633 pcs for the obsolete part). Active status ensures continued manufacturer support and supply reliability.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 74HC191DB,118 and 74HC191PW,118 are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What design considerations apply when switching packages?

A: The 16-TSSOP package is narrower (4.40mm) than the 16-SSOP package (5.30mm). PCB footprint modifications are required. Pin spacing and electrical characteristics remain compatible. Verify PCB layout clearances and thermal management requirements for your specific application.