MM74HC259M Equivalent & Substitute Parts

Part Overview

The MM74HC259M is a D-Type, Addressable 1:8 latch IC manufactured by onsemi in 16-SOIC surface mount packaging. This component functions as an 8-bit addressable latch for logic applications requiring address decoding and data latching. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC259M
Manufacturer	onsemi
Logic Type	D-Type, Addressable
Circuit Configuration	1 Channel 1:8
Output Type	Standard
Voltage Supply Range	2V ~ 6V
Propagation Delay	17ns
Output Current (High/Low)	5.2mA / 5.2mA
Operating Temperature	-40°C ~ 85°C
Package Type	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)
Base Product Number	74HC259

Substitute Part Grouping Explanation

Substitution for the MM74HC259M is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic Type: D-Type, Addressable
Circuit Configuration: 1 Channel 1:8
Output Type: Standard
Voltage Supply Range: 2V ~ 6V
Package Type: 16-SOIC surface mount
Output Current Capability: 5.2mA (High and Low)
Moisture Sensitivity Level: 1 (Unlimited)

Acceptable Variation Parameters:

Propagation Delay: 13ns to 25ns (all substitutes maintain timing within acceptable logic circuit tolerances)
Operating Temperature Range: -40°C to -55°C minimum; 85°C to 125°C maximum (extended ranges are acceptable)
Product Status: Active or Discontinued parts are functionally equivalent

All substitute parts listed maintain identical electrical specifications for supply voltage, output current, and logic function. Package dimensions remain consistent at 16-SOIC (0.154", 3.90mm Width) across all substitutes.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Voltage Supply	Propagation Delay	Output Current	Operating Temp	Package	Product Status
MM74HC259M	onsemi	D-Type, Addressable	1:8	2V ~ 6V	17ns	5.2mA / 5.2mA	-40°C ~ 85°C	16-SOIC	Obsolete
MC74HC259ADG	onsemi	D-Type, Addressable	1:8	2V ~ 6V	25ns	5.2mA / 5.2mA	-55°C ~ 125°C	16-SOIC	Obsolete
NLVHC259ADR2G	onsemi	D-Type, Addressable	1:8	2V ~ 6V	25ns	5.2mA / 5.2mA	-55°C ~ 125°C	16-SOIC	Obsolete
SN74HC259D	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics
CD74HC259M96	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-55°C ~ 125°C	16-SOIC	Active
CD74HC259MT	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics
74HC259D,653	Nexperia USA Inc.	D-Type, Addressable	1:8	2V ~ 6V	17ns	5.2mA / 5.2mA	-40°C ~ 125°C	16-SOIC	Active
M74HC259YRM13TR	STMicroelectronics	D-Type, Addressable	1:8	2V ~ 6V	15ns	5.2mA / 5.2mA	-40°C ~ 125°C	16-SOIC	Active
SN74HC259DR	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-40°C ~ 85°C	16-SOIC	Active
SN74HC259DT	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics
SN74HC259NSR	Texas Instruments	D-Type, Addressable	1:8	2V ~ 6V	13ns	5.2mA / 5.2mA	-40°C ~ 85°C	16-SOIC	Active

Engineering Selection Recommendations

For Active Product Status (Recommended for New Designs):

CD74HC259M96 (Texas Instruments) is the preferred substitute. This part maintains active product status, ensuring long-term availability and manufacturing support. It provides superior propagation delay performance at 13ns compared to the original 17ns specification, with extended operating temperature range (-55°C to 125°C). RoHS3 compliance is confirmed.

74HC259D,653 (Nexperia USA Inc.) is an alternative active substitute with matching propagation delay (17ns) to the original MM74HC259M. This part offers extended upper operating temperature to 125°C and maintains RoHS3 compliance.

M74HC259YRM13TR (STMicroelectronics) is an active substitute with automotive-grade qualification (AEC-Q100). This part is suitable for applications requiring automotive-level reliability and traceability. Propagation delay is 15ns with extended temperature range to 125°C.

For Existing Inventory or Legacy Support:

SN74HC259DR (Texas Instruments) is an active part offering 13ns propagation delay with standard commercial operating temperature range (-40°C to 85°C). This part is suitable for direct replacement in existing designs.

SN74HC259NSR (Texas Instruments) is an active part with identical electrical specifications to SN74HC259DR, available in Cut Tape and Digi-Reel packaging.

Discontinued Parts (Not Recommended for New Designs):

SN74HC259D, SN74HC259DT, CD74HC259MT, MC74HC259ADG, and NLVHC259ADR2G are discontinued or obsolete. These parts should only be used for legacy system maintenance where active alternatives are not suitable.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for MM74HC259M?

A: Yes. All listed substitute parts maintain identical logic type (D-Type, Addressable), circuit configuration (1:8), supply voltage range (2V to 6V), output current capability (5.2mA), and 16-SOIC package dimensions. Electrical function is fully compatible.

Q: What is the difference between propagation delay values (13ns, 15ns, 17ns, 25ns)?

A: Propagation delay is the time required for an output to respond to an input change. All listed values (13ns to 25ns) are within acceptable tolerances for standard logic circuits. Faster delays (13ns) provide improved timing performance; slower delays (25ns) remain functionally equivalent for most applications. Selection depends on specific circuit timing requirements.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use 16-SOIC surface mount packaging with identical 0.154" (3.90mm) width. Packaging variations exist only in tape format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel. These are supply format differences only and do not affect electrical or mechanical compatibility.

Q: Which substitute part should I choose for a new design?

A: CD74HC259M96 (Texas Instruments) is recommended for new designs due to active product status, superior propagation delay (13ns), extended operating temperature range (-55°C to 125°C), and confirmed RoHS3 compliance. This ensures long-term availability and manufacturing support.

Q: What does "Obsolete" or "Discontinued at DiGi Electronics" product status mean?

A: Obsolete parts are no longer manufactured. Discontinued at DiGi Electronics indicates the distributor no longer stocks the part, though limited inventory may exist elsewhere. For new designs, select parts with Active status to ensure ongoing availability.

Q: Are automotive-qualified parts necessary for my application?

A: Automotive-qualified parts (AEC-Q100) like M74HC259YRM13TR are required only for automotive applications or systems requiring automotive-level reliability certification. Standard commercial parts are suitable for general industrial and consumer applications.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes. All substitute parts are electrically equivalent and can be used interchangeably within the same design. However, for manufacturing consistency and supply chain management, using a single part number across production is recommended.

Q: What is Moisture Sensitivity Level (MSL)?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts share this specification, requiring no special precautions.

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