CD74HC597MG4 Equivalent & Substitute Parts

Part Overview

The CD74HC597MG4 is an 8-bit shift register logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a parallel-to-serial or serial-to-serial converter with push-pull output configuration. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	Shift Register
Number of Elements	1
Number of Bits per Element	8
Function	Parallel or Serial to Serial
Output Type	Push-Pull
Voltage - Supply	2V ~ 6V
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC597MG4 is determined by strict equivalence across the following parameters:

Logic Type: Shift Register
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Push-Pull
Voltage Supply Range: 2V ~ 6V
Package / Case: 16-SOIC (0.154", 3.90mm Width)
Operating Temperature Range: -55°C ~ 125°C or compatible subset

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents maintain identical base product numbers (74HC597) with full parameter compatibility across all electrical and mechanical specifications.

Parametric Equivalents share the same functional characteristics and package but may have different base product numbers (such as 74HC166) while maintaining electrical compatibility within the specified voltage and temperature ranges.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Bits per Element	Output Type	Voltage Supply	Operating Temp	Package	Product Status	RoHS Status
CD74HC597MG4	Texas Instruments	Shift Register	8	Push-Pull	2V ~ 6V	-55°C ~ 125°C	16-SOIC	Discontinued	ROHS3 Compliant
CD74HC597M	Harris Corporation	Shift Register	8	Push-Pull	2V ~ 6V	-55°C ~ 125°C	16-SOIC	Obsolete	RoHS Non-Compliant
MC74HC597ADR2G	onsemi	Shift Register	8	Push-Pull	2V ~ 6V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
74HC597D,653	Nexperia USA Inc.	Shift Register	8	Push-Pull	2V ~ 6V	-40°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
CD74HC166M	Texas Instruments	Shift Register	8	Push-Pull	2V ~ 6V	-55°C ~ 125°C	16-SOIC	Discontinued	ROHS3 Compliant
MC74HC597ADG	onsemi	Shift Register	8	Push-Pull	2V ~ 6V	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MC74HC597ADR2G (onsemi)

This part is the preferred substitute. It maintains full electrical and mechanical compatibility with the CD74HC597MG4, carries Active product status ensuring long-term availability, and is ROHS3 compliant. The Tape & Reel packaging supports high-volume production requirements.

Secondary Recommendation: 74HC597D,653 (Nexperia USA Inc.)

This part provides an alternative from an established manufacturer with Active status and ROHS3 compliance. The operating temperature range extends to -40°C minimum, which is acceptable for most applications requiring the original -55°C specification. Cut Tape & Digi-Reel packaging is suitable for standard procurement workflows.

Alternative Recommendation: MC74HC597ADG (onsemi)

This part offers identical electrical specifications to the primary recommendation with Active status and ROHS3 compliance. Tube packaging may be preferred for certain assembly processes.

Not Recommended: CD74HC597M (Harris Corporation)

This part is obsolete and RoHS non-compliant, making it unsuitable for new designs or compliance-sensitive applications.

Not Recommended: CD74HC166M (Texas Instruments)

While functionally compatible, this part is discontinued and represents a different base product number (74HC166 versus 74HC597), introducing unnecessary design complexity.

Frequently Asked Questions (FAQ)

Q: Can MC74HC597ADR2G directly replace CD74HC597MG4 in existing designs?

A: Yes. Both parts share identical electrical specifications (2V ~ 6V supply, -55°C ~ 125°C operating range, 8-bit shift register function, push-pull output) and the same 16-SOIC package footprint. Pin configuration and functional behavior are equivalent.

Q: What is the difference between 74HC597 and 74HC166 shift registers?

A: Both are 8-bit shift registers in 16-SOIC packages with identical voltage and temperature specifications. The 74HC166 is a parametric equivalent suitable for applications where the specific base product number is not critical. Verify datasheet functional differences for your specific application requirements.

Q: Why is the operating temperature range -40°C ~ 125°C acceptable for 74HC597D,653 when the original specifies -55°C ~ 125°C?

A: The 74HC597D,653 has a narrower minimum operating temperature specification (-40°C versus -55°C). This part is suitable for applications operating within the -40°C to 125°C range. Applications requiring operation below -40°C must use alternatives with -55°C minimum ratings.

Q: What packaging options are available for 74HC597 equivalents?

A: Available packaging includes Tube (CD74HC597M, MC74HC597ADG), Tape & Reel (MC74HC597ADR2G), and Cut Tape & Digi-Reel (74HC597D,653). Selection depends on procurement volume and assembly process requirements.

Q: Are all recommended substitutes ROHS3 compliant?

A: MC74HC597ADR2G, 74HC597D,653, and MC74HC597ADG are ROHS3 compliant. CD74HC597M is RoHS non-compliant and unsuitable for applications requiring regulatory compliance.

Q: What is the inventory status for these substitutes?

A: MC74HC597ADR2G has the highest inventory (32,620 pcs), followed by 74HC597D,653 (30,500 pcs) and MC74HC597ADG (1,769 pcs). CD74HC597M (2,074 pcs) and CD74HC166M (1,490 pcs) have limited availability.

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