SN74HC158DR Equivalent & Substitute Parts

Part Overview

The SN74HC158DR 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 active in production with 3800 units in stock. The SN74HC158DR serves as a data selector in digital logic applications requiring multiplexing of multiple input signals to a single output line. Substitute parts become necessary when the primary part number reaches end-of-life status, experiences supply constraints, or when alternative packaging formats are required for specific manufacturing processes.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Logic
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	2V ~ 6V
Current - Output High, Low	7.8mA, 7.8mA
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC158DR is determined by strict equivalence across the following parameters: circuit configuration (4 x 2:1 multiplexer), package type (16-SOIC), mounting method (surface mount), voltage supply range (2V ~ 6V), output current specifications (7.8mA high and low), operating temperature range (-40°C ~ 85°C), and compliance certifications (ROHS3, REACH Unaffected). All qualified substitute parts maintain identical electrical performance and physical compatibility with the original SN74HC158DR. Packaging format variations (Tape & Reel versus Cut Tape & Digi-Reel) do not affect functional equivalence but may impact procurement and assembly workflows.

Parameter Comparison

Part Number	Manufacturer	Base Product	Circuit	Package	Voltage Supply	Output Current (High/Low)	Operating Temp	Product Status	Packaging Format	Inventory
SN74HC158DR	Texas Instruments	74HC158	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 85°C	Active	Tape & Reel (TR)	3800 Pcs
SN74HC157DR	Texas Instruments	74HC157	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel	9770 Pcs
SN74HC157DT	Texas Instruments	74HC157	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	2230 Pcs
SN74HC158DT	Texas Instruments	74HC158	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 85°C	Last Time Buy	Tape & Reel (TR)	2106 Pcs
SN74HC257DR	Texas Instruments	74HC257	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel	5257 Pcs
SN74HC257DT	Texas Instruments	74HC257	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	950 Pcs
SN74HC258DR	Texas Instruments	74HC258	4 x 2:1	16-SOIC	2V ~ 6V	7.8mA, 7.8mA	-40°C ~ 85°C	Active	Tape & Reel (TR)	3174 Pcs

Engineering Selection Recommendations

For new designs and active production, SN74HC157DR and SN74HC258DR are preferred substitutes due to their active product status and higher inventory availability. SN74HC257DR is also suitable for active designs with adequate stock levels. Parts designated as "Last Time Buy" (SN74HC158DT) or "Discontinued at DiGi Electronics" (SN74HC157DT, SN74HC257DT) should be avoided for new production unless existing inventory commitments require their use. All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence with the original SN74HC158DR. Selection between Tape & Reel and Cut Tape & Digi-Reel packaging formats depends on assembly equipment compatibility and procurement workflow requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74HC157DR be used as a direct replacement for SN74HC158DR? A: Yes. Both parts share identical electrical specifications: 4 x 2:1 multiplexer configuration, 16-SOIC package, 2V ~ 6V supply voltage, 7.8mA output current, and -40°C ~ 85°C operating temperature range. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and inventory availability.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging? A: Tape & Reel (TR) packaging supplies components on continuous carrier tape suitable for high-speed automated assembly. Cut Tape (CT) & Digi-Reel packaging provides smaller quantities on cut tape segments, typically for lower-volume production or prototyping. Both formats contain identical components in the same 16-SOIC package.

Q: Are parts marked "Discontinued at DiGi Electronics" still functional equivalents? A: Yes. Discontinued parts maintain full electrical and mechanical equivalence. However, their use is limited to applications where existing inventory is available, as future procurement may not be possible.

Q: Why are there multiple base product numbers (74HC157, 74HC158, 74HC257) if they are all equivalent? A: All three base products (74HC157, 74HC158, 74HC257) implement the same 4 x 2:1 multiplexer function with identical electrical performance and package specifications. The different base numbers reflect design variants within the 74HC logic family, but they are functionally interchangeable for this application.

Q: Does product status affect functional performance? A: No. Product status (Active, Last Time Buy, or Discontinued) reflects manufacturing and supply availability, not electrical performance. All parts in this equivalence group deliver identical circuit functionality and electrical characteristics.

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