MM74HC594MX Equivalent & Substitute Parts

Part Overview

The MM74HC594MX is an 8-bit shift register logic IC manufactured by onsemi, designed for serial-to-parallel data conversion applications. This component features push-pull output configuration and operates across a 2V to 6V supply voltage range with an operating temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC594MX
Manufacturer	onsemi
Logic Type	Shift Register
Number of Bits per Element	8
Function	Serial to Parallel
Output Type	Push-Pull
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC594MX is determined by strict alignment with the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: Shift Register (8-bit configuration)
Function: Serial to Parallel conversion capability
Output Type: Push-Pull configuration
Voltage Supply Range: 2V ~ 6V minimum compatibility
Package: 16-SOIC form factor
Mounting Type: Surface Mount

Parts are categorized into three substitution tiers based on parameter alignment:

Direct Manufacturer Substitutes maintain identical electrical specifications and package dimensions, with active product status and current manufacturing availability.

Similar Manufacturer Substitutes meet all critical electrical parameters and package requirements but may differ in product status, operating temperature range extensions, or packaging format (tape & reel vs. tube).

Parametric Equivalents satisfy core functional requirements and electrical parameters but may have secondary specification variations or discontinued status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Output Type	Function	Voltage - Supply	Operating Temperature	Package / Case	Product Status
MM74HC594MX	onsemi	Shift Register	Push-Pull	Serial to Parallel	2V ~ 6V	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm Width)	Obsolete
SN74HC594DR	Texas Instruments	Shift Register	Push-Pull	Serial to Parallel	2V ~ 6V	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm Width)	Active
74HC594D,112	Nexperia USA Inc.	Shift Register	Push-Pull	Serial to Parallel, Serial	2V ~ 6V	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	Obsolete
74HC594D,118	Nexperia USA Inc.	Shift Register	Push-Pull	Serial to Parallel, Serial	2V ~ 6V	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	Active
74HC594D-Q100,118	NXP USA Inc.	Shift Register	Push-Pull	Serial to Parallel, Serial	2V ~ 6V	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	Active
74HC594S16-13	Diodes Incorporated	Shift Register	Push-Pull	Serial to Parallel, Serial	2V ~ 6V	-40°C ~ 125°C	16-SOIC (0.154", 3.90mm Width)	Active
SN74HC594DW	Texas Instruments	Shift Register	Push-Pull	Serial to Parallel	2V ~ 6V	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm Width)	Last Time Buy
SN74HC594DWR	Texas Instruments	Shift Register	Push-Pull	Serial to Parallel	2V ~ 6V	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm Width)	Active
SN74HC594DT	Texas Instruments	Shift Register	Push-Pull	Serial to Parallel	2V ~ 6V	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm Width)	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Primary Recommendation: SN74HC594DR (Texas Instruments)

The SN74HC594DR represents the optimal substitute for the obsolete MM74HC594MX. This part maintains identical electrical specifications across all critical parameters: 8-bit shift register configuration, push-pull output, 2V to 6V supply voltage range, and -40°C to 85°C operating temperature. The 16-SOIC package dimensions (0.154", 3.90mm width) provide direct PCB layout compatibility. Active product status ensures long-term availability and manufacturing continuity. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with modern production standards.

Secondary Recommendation: 74HC594D,118 (Nexperia USA Inc.)

The 74HC594D,118 offers extended operating temperature range (-40°C to 125°C) compared to the original specification, providing additional thermal margin for demanding applications. Active product status and high inventory availability (28,149 pcs) support production requirements. Tape & Reel packaging format suits high-volume manufacturing. RoHS3 compliance is confirmed.

Alternative for Automotive Applications: 74HC594D-Q100,118 (NXP USA Inc.)

For designs requiring automotive-grade qualification, the 74HC594D-Q100,118 provides AEC-Q100 certification with identical core electrical parameters. Extended operating temperature range (-40°C to 125°C) and active product status support automotive supply chain requirements.

Package Consideration: SN74HC594DWR (Texas Instruments)

The SN74HC594DWR maintains identical electrical specifications but features a wider 16-SOIC package (0.295", 7.50mm width). This variant is suitable only for designs with PCB layout accommodation for the larger package footprint. Active product status and Tape & Reel packaging support production environments.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC594DR be used as a direct replacement for MM74HC594MX without PCB modifications?

A: Yes. The SN74HC594DR maintains identical package dimensions (16-SOIC, 0.154", 3.90mm width), pin configuration, and electrical specifications. No PCB layout changes are required for direct substitution.

Q: What is the difference between the 74HC594D,118 and 74HC594D,112 variants?

A: Both parts are manufactured by Nexperia and meet the core substitution parameters. The primary difference is product status: 74HC594D,118 is active with higher inventory availability, while 74HC594D,112 is obsolete. For new designs, 74HC594D,118 is preferred.

Q: Why do some substitute parts list "Serial to Parallel, Serial" function while the original specifies only "Serial to Parallel"?

A: The MM74HC594MX is optimized for serial-to-parallel conversion. Some substitute parts (74HC594D,118, 74HC594D-Q100,118, 74HC594S16-13) support both serial-to-parallel and serial output configurations, providing functional superset capability. This expanded functionality does not affect compatibility; the parts operate identically in serial-to-parallel mode.

Q: Is the SN74HC594DW suitable for new production designs?

A: No. The SN74HC594DW carries "Last Time Buy" status, indicating discontinued manufacturing. For new designs, select SN74HC594DR or 74HC594D,118. The SN74HC594DW may be considered only for legacy product support with confirmed remaining inventory.

Q: What is the significance of the extended operating temperature range (-40°C to 125°C) in substitute parts?

A: The MM74HC594MX operates to 85°C maximum. Substitute parts with 125°C ratings provide additional thermal margin and are suitable for applications with elevated ambient temperatures or thermal stress conditions. This extended range does not affect compatibility in standard -40°C to 85°C operating environments.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active and recently discontinued substitute parts listed carry RoHS3 compliance certification. Obsolete variants (74HC594D,112, SN74HC594DT) also confirm RoHS3 status based on provided specifications.

Q: What packaging formats are available for the 74HC594 series?

A: Substitute parts are available in three packaging formats: Cut Tape (CT) & Digi-Reel for small-quantity procurement, Tape & Reel (TR) for high-volume production, and Tube for standard distribution. Package selection depends on procurement volume and manufacturing process requirements, not electrical compatibility.

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