CD74HC191MT Equivalent & Substitute Parts

Part Overview

The CD74HC191MT is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This device functions as a synchronous up/down counter with asynchronous reset capability, operating at a maximum count rate of 35 MHz across a supply voltage range of 2V to 6V. The part is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and maintenance applications.

Substiute Parts

CD74HC191MT

Texas InstrumentsIn Stock: 1935CD74HC191MT Datasheet

Current PartRFQ

CD74HC191M96

Texas InstrumentsIn Stock: 5261CD74HC191M96 Datasheet

Parametric EquivalentRFQ

74HC191D,653

Nexperia USA Inc.In Stock: 291274HC191D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC191MT is determined by strict equivalence across the following critical parameters: logic type (binary counter), bit width (4-bit), directional capability (up/down), reset mechanism (asynchronous), timing architecture (synchronous), trigger polarity (positive edge), supply voltage compatibility (2V to 6V), package form factor (16-SOIC), and mounting technology (surface mount). All substitute parts must maintain identical functional specifications and physical compatibility to ensure direct replacement without circuit redesign. The base product number 74HC191 serves as the common reference across all qualified substitutes.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC191MT is designated Last Time Buy status, making substitute selection necessary for ongoing production requirements. The CD74HC191M96, manufactured by Texas Instruments, provides parametric equivalence with identical electrical and thermal specifications, maintaining full compatibility with existing designs. This part carries Active product status and represents the primary substitute option from the original manufacturer.

The 74HC191D,653, manufactured by Nexperia USA Inc., offers an alternative from a qualified secondary source. This part maintains functional equivalence across all critical parameters with the exception of count rate (39 MHz versus 35 MHz) and minimum operating temperature (-40°C versus -55°C). Both substitutes are ROHS3 compliant and carry MSL rating 1, ensuring compliance with environmental and moisture sensitivity requirements equivalent to the main part.

Selection between CD74HC191M96 and 74HC191D,653 depends on application-specific thermal and frequency requirements. Applications requiring the full -55°C to 125°C temperature range or 35 MHz maximum count rate specification should utilize CD74HC191M96. Applications operating within -40°C to 125°C and tolerant of 39 MHz count rate performance may utilize 74HC191D,653.

Frequently Asked Questions (FAQ)

Q: Can CD74HC191M96 be used as a direct replacement for CD74HC191MT? A: Yes. CD74HC191M96 maintains identical electrical specifications, package form factor, and pin configuration. Both parts are manufactured by Texas Instruments and share the same base product number 74HC191.

Q: What is the difference between CD74HC191M96 and 74HC191D,653? A: Both parts function as 4-bit binary counters with identical logic architecture. The 74HC191D,653 operates at 39 MHz maximum count rate compared to 35 MHz for CD74HC191M96, and has a minimum operating temperature of -40°C versus -55°C. The 74HC191D,653 is manufactured by Nexperia USA Inc. rather than Texas Instruments.

Q: Are all substitute parts in the same package? A: Yes. All listed substitutes use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin configuration and PCB footprint compatibility.

Q: Do substitute parts meet the same compliance standards? A: Yes. All substitute parts are ROHS3 compliant, carry MSL rating 1 (Unlimited), and are REACH unaffected, matching the compliance profile of the main part.

Q: Which substitute should be selected for new designs? A: CD74HC191M96 is recommended for new designs due to Active product status and full specification equivalence with the original part across all temperature and frequency parameters.