CD74HC191MG4 Equivalent & Substitute Parts

Part Overview

The CD74HC191MG4 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 binary counter with asynchronous reset, supporting both up and down counting operations at a maximum count rate of 35 MHz. The part is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 4-bit binary counter functionality.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	4
Direction	Up, Down
Reset Type	Asynchronous
Timing	Synchronous
Count Rate	35 MHz
Trigger Type	Positive Edge
Voltage Supply Range	2 V ~ 6 V
Operating Temperature Range	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD74HC191MG4 is determined by strict equivalence across the following critical parameters:

Logic Type: Binary Counter (4-bit, single element)
Counting Direction: Up and Down capability
Reset Configuration: Asynchronous reset with synchronous timing
Trigger Mechanism: Positive edge triggered
Voltage Supply Range: 2 V ~ 6 V compatibility
Package / Case: 16-SOIC surface mount form factor
Compliance: ROHS3 compliant, REACH unaffected

The identified substitute parts maintain identical functional specifications and package geometry, ensuring direct pin-for-pin compatibility. Packaging format (Tube vs. Tape & Reel) represents a supply chain variation and does not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	CD74HC191MG4 (Main)	CD74HC191M96	74HC191D,653
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
Reset Type	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous
Count Rate	35 MHz	35 MHz	39 MHz
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V
Operating Temperature Range	-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
Packaging Format	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both CD74HC191M96 and 74HC191D,653 are functionally equivalent substitutes for the CD74HC191MG4. Selection between these alternatives should be based on the following factors:

CD74HC191M96 (Texas Instruments) maintains identical specifications to the main part, including the full operating temperature range of -55°C ~ 125°C and 35 MHz count rate. This part is currently in active production status with 5157 units in stock, providing supply continuity from the original manufacturer.

74HC191D,653 (Nexperia USA Inc.) offers a higher count rate specification of 39 MHz and operates within a narrower temperature range of -40°C ~ 125°C. This part is also in active production status with 2846 units in stock. The enhanced count rate provides performance margin for timing-critical applications, though the reduced low-temperature operating limit may be a constraint in extreme environment applications.

Both substitutes are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can CD74HC191M96 be used as a direct replacement for CD74HC191MG4?

A: Yes. CD74HC191M96 is a direct pin-for-pin substitute with identical electrical specifications, package geometry, and operating parameters. The only difference is packaging format (Tape & Reel vs. Tube), which does not affect circuit functionality.

Q: What is the difference between CD74HC191M96 and 74HC191D,653?

A: Both parts are functionally equivalent 4-bit binary counters in 16-SOIC packages. The 74HC191D,653 offers a higher maximum count rate of 39 MHz compared to 35 MHz for CD74HC191M96. The 74HC191D,653 operates over a narrower temperature range (-40°C to 125°C) versus the full range (-55°C to 125°C) of CD74HC191M96. Both are manufactured to ROHS3 compliance.

Q: Does packaging format (Tube vs. Tape & Reel) affect circuit performance?

A: No. Packaging format is a supply chain and handling consideration only. Tube and Tape & Reel packaging contain identical components with no electrical or mechanical differences. Selection between formats depends on assembly process requirements and inventory management practices.

Q: Are these substitutes suitable for high-temperature applications?

A: CD74HC191M96 supports the full operating range of -55°C ~ 125°C, matching the original part. The 74HC191D,653 operates to 125°C maximum but has a minimum operating temperature of -40°C. For applications requiring operation below -40°C, CD74HC191M96 is the appropriate selection.

Q: What is the significance of the "Last Time Buy" status for CD74HC191MG4?

A: Last Time Buy indicates the original part is discontinued and no longer manufactured. Both substitute parts are in active production status, ensuring long-term availability and supply chain stability for new designs and production runs.

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