CD74HC191M Equivalent & Substitute Parts

Part Overview

The CD74HC191M is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component functions as a synchronous binary counter with both up and down counting capability, operating at a maximum count rate of 35 MHz across a supply voltage range of 2 V to 6 V. The part is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring this counter functionality.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Direction	Up, Down
Count Rate	35 MHz
Voltage - Supply	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Reset	Asynchronous
Timing	Synchronous
Trigger Type	Positive Edge

Substitute Part Grouping Explanation

Substitution for the CD74HC191M is determined by strict equivalence across the following critical parameters: logic type (binary counter), bit width (4-bit), counting direction (up/down capability), package type (16-SOIC surface mount), and electrical specifications (supply voltage range, operating temperature, count rate, and trigger characteristics). All substitute parts must maintain the same functional architecture and pin compatibility to ensure direct replacement without circuit redesign.

The CD74HC191M belongs to the 74HC191 base product family. Substitute parts within this family are qualified based on identical or superior electrical performance and compatible packaging configurations. Packaging variants (Tube versus Tape & Reel) do not affect functional equivalence but reflect different distribution and handling methods.

Parameter Comparison

Parameter	CD74HC191M (Main)	CD74HC191M96 (Substitute)	74HC191D,653 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Bits per Element	4	4	4
Direction	Up, Down	Up, Down	Up, Down
Count Rate	35 MHz	35 MHz	39 MHz
Voltage - Supply	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Reset	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Product Status	Last Time Buy	Active	Active
Packaging Format	Tube	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The CD74HC191M96 is the primary substitute, manufactured by Texas Instruments with Active product status. This part maintains identical electrical specifications and packaging to the main part, differing only in distribution format (Tape & Reel versus Tube). The Active status ensures continued availability and supply chain stability.

The 74HC191D,653 manufactured by Nexperia USA Inc. is a secondary substitute with Active product status. This part meets all functional requirements with equivalent count rate performance (39 MHz exceeds the 35 MHz specification). The operating temperature range is -40°C to 125°C, which is narrower than the main part's -55°C to 125°C range. Selection of this substitute requires confirmation that the application does not require operation below -40°C.

Both substitutes are ROHS3 compliant and carry MSL rating of 1 (Unlimited), matching the main part's compliance profile.

Frequently Asked Questions (FAQ)

Q: Can CD74HC191M96 be used as a direct replacement for CD74HC191M?

A: Yes. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and use the same 16-SOIC package. The difference is packaging format: CD74HC191M is supplied in Tube format, while CD74HC191M96 is supplied in Tape & Reel format. Functional performance is equivalent.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube and Tape & Reel are distribution and handling formats that do not affect the component's electrical or mechanical properties. Tube packaging is used for lower-volume orders, while Tape & Reel is standard for automated assembly processes. The die and package specifications are identical.

Q: Can 74HC191D,653 replace CD74HC191M in all applications?

A: 74HC191D,653 is functionally equivalent for applications operating within the temperature range of -40°C to 125°C. If your application requires operation below -40°C, the CD74HC191M or CD74HC191M96 must be used, as they support -55°C to 125°C.

Q: Are all three parts pin-compatible?

A: Yes. All three parts are 4-bit binary counters in 16-SOIC packages with identical pin configurations, logic functions, and electrical characteristics within their specified operating ranges.

Q: What is the significance of "Last Time Buy" status for CD74HC191M?

A: Last Time Buy indicates that Texas Instruments will discontinue this specific part number. Existing inventory is available, but no future production is planned. Transitioning to CD74HC191M96 (Active status) or 74HC191D,653 (Active status) is recommended for long-term design continuity.

Q: Do all three parts meet RoHS compliance requirements?

A: Yes. CD74HC191M, CD74HC191M96, and 74HC191D,653 are all ROHS3 compliant and carry MSL rating of 1 (Unlimited), meeting standard environmental and reliability standards.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message