MM74HC259MTC Equivalent & Substitute Parts

Part Overview

The MM74HC259MTC is a D-Type, Addressable 1:8 decoder/latch IC manufactured by onsemi in a 16-TSSOP surface mount package. This component functions as an 8-bit addressable latch with standard output configuration, operating across a 2V to 6V supply voltage range. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts maintain functional equivalence while offering improved availability and extended product lifecycle support.

Key Parameters

Parameter	Value
Logic Type	D-Type, Addressable
Circuit Configuration	1:8
Output Type	Standard
Voltage Supply Range	2V ~ 6V
Independent Circuits	1
Current Output (High/Low)	5.2mA / 5.2mA
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Base Product Number	74HC259

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC259MTC is determined by strict adherence to the following parameters:

Logic Type & Circuit Configuration: All substitutes must maintain D-Type, Addressable logic with 1:8 circuit configuration
Output Characteristics: Standard output type with 5.2mA output current (both high and low states)
Voltage Supply Range: Operating range of 2V ~ 6V is mandatory
Package & Mounting: 16-TSSOP surface mount package with 0.173" width (4.40mm) is required for PCB compatibility
Base Product Number: All substitutes share the 74HC259 base product designation

Propagation delay time, operating temperature range, and product status variations do not disqualify substitution eligibility when all electrical and mechanical parameters align. Compliance certifications (RoHS, REACH) and automotive qualifications represent value-added attributes but are not substitution blockers.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Propagation Delay (ns)	Operating Temperature (°C)	Packaging	RoHS Status	Automotive Grade
MM74HC259MTC	onsemi	Obsolete	17	-40 ~ 85	Tape & Reel	Not specified	No
MC74HC259ADTR2G	onsemi	Active	25	-55 ~ 125	Tape & Reel	ROHS3 Compliant	No
NLV74HC259ADTR2G	onsemi	Obsolete	25	-55 ~ 125	Tape & Reel	ROHS3 Compliant	Yes (AEC-Q100)
74HC259PW,118	Nexperia USA Inc.	Active	17	-40 ~ 125	Tape & Reel	ROHS3 Compliant	No
M74HC259YTTR	STMicroelectronics	Active	15	-40 ~ 125	Tape & Reel	ROHS3 Compliant	Yes (AEC-Q100)
SN74HC259PWR	Texas Instruments	Active	13	-40 ~ 85	Cut Tape & Digi-Reel	ROHS3 Compliant	No
SN74HC259PWT	Texas Instruments	Discontinued at DiGi Electronics	13	-40 ~ 85	Tape & Reel	ROHS3 Compliant	No

Engineering Selection Recommendations

For Active Production (Preferred)

MC74HC259ADTR2G (onsemi) and 74HC259PW,118 (Nexperia) are recommended as primary substitutes. Both maintain active product status with ROHS3 compliance. MC74HC259ADTR2G offers extended operating temperature range (-55°C ~ 125°C) suitable for industrial environments. The 74HC259PW,118 provides matching propagation delay (17ns) to the original MM74HC259MTC with extended upper temperature limit (125°C).

For Automotive Applications

M74HC259YTTR (STMicroelectronics) and NLV74HC259ADTR2G (onsemi) carry AEC-Q100 automotive qualification. M74HC259YTTR is currently active with superior propagation delay performance (15ns). NLV74HC259ADTR2G, though obsolete, provides automotive-grade assurance with extended temperature range.

For High-Volume Availability

SN74HC259PWR (Texas Instruments) offers the largest inventory (132,400 pcs) with fastest propagation delay (13ns) and active product status. This part is suitable for applications where performance margin and supply continuity are critical factors.

Frequently Asked Questions (FAQ)

Q: Can I substitute MM74HC259MTC with any 74HC259 variant?

A: No. Substitution requires matching all electrical parameters (2V ~ 6V supply, 5.2mA output current, 1:8 configuration) and mechanical specifications (16-TSSOP package, surface mount). Only parts listed in this document meet these criteria.

Q: What is the difference between propagation delay variations (13ns to 25ns)?

A: Propagation delay indicates the time required for output changes following input transitions. Faster delays (13ns) provide tighter timing margins in high-speed applications. Slower delays (25ns) remain within standard 74HC logic specifications and are functionally compatible for most applications. Selection depends on system timing requirements.

Q: Are RoHS3 compliant parts drop-in replacements?

A: Yes. RoHS3 compliance indicates lead-free construction and environmental compliance. All RoHS3 compliant substitutes listed maintain electrical and mechanical compatibility with the original MM74HC259MTC.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive industry qualification standard. Parts carrying this designation (M74HC259YTTR, NLV74HC259ADTR2G) have undergone additional reliability testing for automotive applications. This qualification is optional for general industrial use but mandatory for automotive OEM applications.

Q: Can I use SN74HC259PWT if it is discontinued at DiGi Electronics?

A: SN74HC259PWT remains functionally equivalent and maintains ROHS3 compliance. Discontinuation at one distributor does not affect technical compatibility. Availability through alternative suppliers should be verified before design commitment.

Q: How do operating temperature ranges affect substitution?

A: Operating temperature range defines the environment where the part functions reliably. The original MM74HC259MTC operates -40°C ~ 85°C. Substitutes with extended ranges (-55°C ~ 125°C) provide additional margin for extreme environments but are fully compatible in the original temperature window.

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