SN74HC259D Equivalent & Substitute Parts

Part Overview

The SN74HC259D 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 SN74HC259D is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain identical electrical characteristics, package specifications, and operational parameters to ensure direct compatibility in existing designs.

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 validity for the SN74HC259D is determined by strict adherence to the following parameters:

Logic Type & Circuit Configuration: All substitutes must be D-Type, Addressable 1:8 multiplexers
Package & Mounting: 16-SOIC surface mount package is mandatory
Voltage Supply Range: 2V to 6V operation required
Output Characteristics: Standard output type with 5.2mA output current capability
Compliance: ROHS3 compliance and MSL Level 1 required
Propagation Delay: Maximum 25ns acceptable (SN74HC259D specifies 13ns)
Operating Temperature: Minimum -40°C to 85°C range required

Substitute parts are grouped by manufacturer and product status. Direct substitutes maintain all electrical parameters within specification. Parts with extended temperature ranges (-55°C to 125°C) or automotive qualifications (AEC-Q100) provide enhanced performance margins but remain functionally compatible.

Parameter Comparison

Part Number	Manufacturer	Status	Propagation Delay (ns)	Temp Range (°C)	Packaging	Inventory
SN74HC259D	Texas Instruments	Discontinued	13	-40 to 85	Tube	3246 Pcs
SN74HC259DR	Texas Instruments	Active	13	-40 to 85	Cut Tape & Digi-Reel	2200 Pcs
MC74HC259ADR2G	onsemi	Active	25	-55 to 125	Tape & Reel	1108 Pcs
74HC259D,653	Nexperia USA Inc.	Active	17	-40 to 125	Cut Tape & Digi-Reel	2200 Pcs
74HC259D-Q100,118	Nexperia USA Inc.	Active	17	-40 to 125	Tape & Reel	1074 Pcs
M74HC259YRM13TR	STMicroelectronics	Active	15	-40 to 125	Tape & Reel	2800 Pcs
MC74HC259ADG	onsemi	Obsolete	25	-55 to 125	Tube	1372 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74HC259DR

The SN74HC259DR from Texas Instruments is the direct functional equivalent of the discontinued SN74HC259D. It maintains identical propagation delay (13ns) and operating temperature range (-40°C to 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect electrical performance. This part is currently active with 2200 units in stock.

Secondary Recommendations (Extended Temperature Range):

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.
74HC259D,653 (Nexperia USA Inc.): Provides 17ns propagation delay with extended temperature range (-40°C to 125°C). Active status with adequate inventory.
74HC259D-Q100,118 (Nexperia USA Inc.): Automotive-qualified variant with AEC-Q100 certification, 17ns propagation delay, and extended temperature range.

Not Recommended:

MC74HC259ADG (onsemi): Obsolete status disqualifies this part for new designs despite adequate inventory.
MC74HC259ADR2G (onsemi): While active, the 25ns propagation delay exceeds the original specification by 92%, potentially affecting timing-critical applications.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC259DR as a direct replacement for SN74HC259D?

A: Yes. SN74HC259DR is electrically and functionally identical to SN74HC259D. Both are Texas Instruments 74HC259 base products with 13ns propagation delay and -40°C to 85°C operating range. The difference is packaging format only (Cut Tape & Digi-Reel versus Tube).

Q: What is the significance of the propagation delay difference between substitutes?

A: Propagation delay determines the maximum switching speed of the addressable latch. The original SN74HC259D specifies 13ns. Substitutes with 15ns (M74HC259YRM13TR) or 17ns (Nexperia parts) remain within acceptable margins for most applications. The 25ns delay in onsemi parts represents a 92% increase and may affect timing-critical designs.

Q: Are automotive-qualified parts (AEC-Q100) compatible with standard applications?

A: Yes. Automotive-qualified parts like 74HC259D-Q100,118 and M74HC259YRM13TR meet all standard electrical requirements and exceed reliability standards. They are fully compatible with non-automotive applications and provide enhanced quality assurance.

Q: Does extended temperature range affect compatibility?

A: No. Parts rated for -55°C to 125°C or -40°C to 125°C are fully compatible with applications requiring only -40°C to 85°C operation. Extended range indicates enhanced thermal capability without compromising standard performance.

Q: What packaging formats are available, and do they affect electrical performance?

A: Substitutes are available in Tube, Cut Tape & Digi-Reel, and Tape & Reel formats. All maintain identical 16-SOIC package dimensions (0.154", 3.90mm width). Packaging format affects handling and storage only; electrical performance is unchanged.

Q: Why is MC74HC259ADG not recommended despite inventory availability?

A: MC74HC259ADG carries Obsolete product status, indicating discontinued manufacturing and no future availability. New designs should not depend on obsolete components.

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