SN74HC259DT Equivalent & Substitute Parts

Part Overview

The SN74HC259DT is an 8-bit addressable latch logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a D-Type, addressable 1:8 multiplexer with standard output configuration. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Logic Type	D-Type, Addressable
Circuit Configuration	1 Channel 1:8
Output Type	Standard
Voltage Supply Range	2V to 6V
Propagation Delay	13ns
Output Current (High/Low)	5.2mA / 5.2mA
Operating Temperature Range	-40°C to 85°C
Package Type	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC259DT is determined by strict equivalence across the following critical parameters:

Logic Type & Circuit Configuration: All substitutes must be D-Type, Addressable 1:8 multiplexers
Package & Mounting: 16-SOIC surface mount package with identical 0.154" (3.90mm) width
Electrical Specifications: Supply voltage 2V–6V, output current 5.2mA/5.2mA, independent circuits = 1
Compliance: ROHS3 compliance and MSL Level 1 required for all substitutes
Propagation Delay: Acceptable range 13ns–25ns (within standard logic IC tolerances for this family)
Operating Temperature: Minimum -40°C to 85°C; extended range acceptable

Substitutes are grouped by manufacturer and product status. Direct parametric equivalents maintain identical propagation delay (13ns). Manufacturer-recommended alternatives may have extended temperature ranges or automotive qualifications (AEC-Q100) with slightly higher propagation delays (15ns–25ns), which remain functionally compatible within the 74HC logic family specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Propagation Delay (ns)	Operating Temperature (°C)	Packaging	Product Status	Inventory (Pcs)
SN74HC259DT	Texas Instruments	13	-40 to 85	Tape & Reel	Discontinued	1884
SN74HC259DR	Texas Instruments	13	-40 to 85	Cut Tape & Digi-Reel	Active	2200
MC74HC259ADR2G	onsemi	25	-55 to 125	Tape & Reel	Active	1108
74HC259D,653	Nexperia USA Inc.	17	-40 to 125	Cut Tape & Digi-Reel	Active	2200
74HC259D-Q100,118	Nexperia USA Inc.	17	-40 to 125	Tape & Reel	Active	1074
M74HC259YRM13TR	STMicroelectronics	15	-40 to 125	Tape & Reel	Active	2800
MC74HC259ADG	onsemi	25	-55 to 125	Tube	Obsolete	1372

Engineering Selection Recommendations

Primary Substitute (Direct Equivalent): SN74HC259DR from Texas Instruments is the direct parametric equivalent with identical 13ns propagation delay and -40°C to 85°C operating range. This part maintains full compatibility with the original SN74HC259DT specification and is currently in active production status with 2200 units in stock.

Secondary Substitutes (Extended Specifications):

M74HC259YRM13TR (STMicroelectronics): Offers 15ns propagation delay with extended temperature range (-40°C to 125°C) and AEC-Q100 automotive qualification. Suitable for applications requiring enhanced thermal performance or automotive-grade reliability.
74HC259D,653 (Nexperia USA Inc.): Provides 17ns propagation delay with extended temperature range (-40°C to 125°C). Active production status with 2200 units available.
74HC259D-Q100,118 (Nexperia USA Inc.): AEC-Q100 qualified automotive variant with 17ns propagation delay and extended temperature range. Recommended for automotive applications.

Alternative Substitutes (Extended Operating Range):

MC74HC259ADR2G (onsemi): Active production with extended temperature range (-55°C to 125°C) and 25ns propagation delay. Acceptable for applications with relaxed timing requirements.

Not Recommended: MC74HC259ADG (onsemi) is obsolete and should not be selected for new designs despite inventory availability.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and 16-SOIC package compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74HC259DR directly replace SN74HC259DT? A: Yes. SN74HC259DR is a direct parametric equivalent with identical propagation delay (13ns), supply voltage range (2V–6V), output current specifications (5.2mA), and operating temperature range (-40°C to 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect electrical performance.

Q: What is the difference between 13ns and 25ns propagation delay? A: Propagation delay determines the time required for a logic state change at the input to appear at the output. The SN74HC259DT specifies 13ns. Substitutes with 15ns, 17ns, or 25ns delays remain within acceptable tolerances for standard 74HC logic family applications. Selection depends on system timing requirements; faster delays (13–15ns) are preferred for time-critical circuits.

Q: Are automotive-qualified parts (AEC-Q100) compatible? A: Yes. AEC-Q100 qualified parts (74HC259D-Q100,118 and M74HC259YRM13TR) are fully compatible with the original SN74HC259DT. Automotive qualification indicates enhanced reliability testing and is beneficial for demanding environments but not required for general industrial applications.

Q: Does extended operating temperature range affect compatibility? A: No. The original SN74HC259DT operates from -40°C to 85°C. Substitutes with extended ranges (-40°C to 125°C or -55°C to 125°C) are fully backward compatible and provide additional thermal margin. Extended range does not compromise performance within the original temperature specification.

Q: What is the significance of packaging differences (Tape & Reel, Cut Tape, Tube)? A: Packaging format affects handling and storage but not electrical performance. Tape & Reel and Cut Tape & Digi-Reel formats are suitable for automated assembly. Tube packaging is typically used for manual handling. Selection depends on production equipment and assembly process requirements.

Q: Why is MC74HC259ADG not recommended despite inventory availability? A: MC74HC259ADG is listed as obsolete, indicating discontinued production and no manufacturer support. While current inventory exists, future availability cannot be assured. Active production alternatives are preferred for design continuity and supply chain reliability.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) rating, meeting environmental and reliability standards equivalent to the original SN74HC259DT.

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