SN74HC258DT Equivalent & Substitute Parts

Part Overview

The SN74HC258DT is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production needs. The SN74HC258DT operates across a 2V to 6V supply range with symmetric output current characteristics, making it suitable for general-purpose logic multiplexing applications in digital systems.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN74HC258DT
Type	Multiplexer
Circuit Configuration	4 x 2:1
Independent Circuits	1
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	2V ~ 6V
Output Current (High/Low)	7.8mA / 7.8mA
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC258DT is determined by strict equivalence across the following critical parameters:

Circuit configuration: 4 x 2:1 multiplexer topology
Independent circuits: 1
Output current specifications: 7.8mA high and low
Voltage supply range: 2V ~ 6V
Operating temperature range: -40°C ~ 85°C
Package type: 16-SOIC surface mount
Compliance certifications: ROHS3, REACH Unaffected, EAR99

All substitute parts listed maintain identical electrical and mechanical specifications. Differences exist only in product status (Active, Discontinued, or Last Time Buy) and packaging format (Cut Tape, Tape & Reel, or Digi-Reel).

Parameter Comparison

Part Number	Manufacturer	Circuit	Package	Voltage Supply	Output Current (H/L)	Temp Range	Product Status	Packaging Format
SN74HC258DT	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Discontinued at DiGi Electronics	Cut Tape (CT) & Digi-Reel
SN74HC157DR	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel
SN74HC157DT	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Discontinued at DiGi Electronics	Cut Tape (CT) & Digi-Reel
SN74HC158DR	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active	Tape & Reel (TR)
SN74HC158DT	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Last Time Buy	Tape & Reel (TR)
SN74HC257DR	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel
SN74HC257DT	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Discontinued at DiGi Electronics	Cut Tape (CT) & Digi-Reel
SN74HC258DR	Texas Instruments	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For applications requiring the SN74HC258DT, the following substitutes are ranked by availability and product status:

Primary Recommendation: SN74HC258DR (Active status, Tape & Reel packaging). This part maintains identical electrical specifications and compliance certifications while offering current production availability.

Secondary Recommendations: SN74HC157DR and SN74HC257DR are both Active status parts with Cut Tape and Digi-Reel packaging options, providing alternative sourcing channels with equivalent performance.

Alternative Options: SN74HC158DR (Active status) and SN74HC158DT (Last Time Buy status) are functionally equivalent but represent different base product numbers within the 74HC multiplexer family.

Avoid for New Designs: SN74HC157DT and SN74HC257DT are discontinued at DiGi Electronics and should not be selected for new production unless existing inventory is confirmed available.

All substitute parts carry ROHS3 compliance, REACH Unaffected status, and EAR99 classification, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute SN74HC258DT with SN74HC157DR in my circuit?

A: Yes. Both parts are 4 x 2:1 multiplexers in 16-SOIC packages with identical voltage supply ranges (2V ~ 6V), output current specifications (7.8mA), and operating temperature ranges (-40°C ~ 85°C). The primary difference is product status: SN74HC157DR is Active while SN74HC258DT is discontinued.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both are surface mount delivery formats. Cut Tape (CT) & Digi-Reel packaging is suitable for smaller quantity orders and manual assembly. Tape & Reel (TR) packaging is optimized for high-volume automated pick-and-place assembly. Electrical performance is identical; the choice depends on production volume and assembly equipment.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original SN74HC258DT specification.

Q: Can I use SN74HC158DT (Last Time Buy status) for new production?

A: SN74HC158DT is available but designated Last Time Buy, indicating limited remaining inventory. For new production designs, select Active status parts such as SN74HC258DR, SN74HC157DR, or SN74HC257DR to ensure long-term supply continuity.

Q: Do all substitutes operate across the same temperature range?

A: Yes. All substitute parts operate across the identical -40°C ~ 85°C temperature range as the original SN74HC258DT.

Q: What determines if a part is a valid substitute?

A: Valid substitutes must match the circuit configuration (4 x 2:1), independent circuits count (1), package type (16-SOIC), voltage supply range (2V ~ 6V), output current specifications (7.8mA high and low), and operating temperature range (-40°C ~ 85°C). All listed parts meet these criteria.

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