SN74AS258DR Equivalent & Substitute Parts

Part Overview

The SN74AS258DR is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SN74AS258DR operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality in the 0°C to 70°C operating temperature range.

Substiute Parts

SN74AS258DR

Texas InstrumentsIn Stock: 3547SN74AS258DR Datasheet

Current PartRFQ

SN74ALS257ADR

Texas InstrumentsIn Stock: 3708SN74ALS257ADR Datasheet

Parametric EquivalentRFQ

SN74ALS258ADR

Texas InstrumentsIn Stock: 848SN74ALS258ADR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AS258DR are determined by matching the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer
• Independent circuits: 1
• Output current specifications: 2.6mA (high), 24mA (low)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Package type: 16-SOIC surface mount
• Compliance certifications: ROHS3, REACH Unaffected

The identified substitute parts maintain electrical equivalence through identical circuit topology, output drive capabilities, and supply voltage specifications. Substitutes differ in logic series designation (74ALS versus 74AS) and product status, but retain full functional compatibility within the specified operating parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS258DR is obsolete, requiring substitution for new designs and ongoing procurement. The SN74ALS257ADR is the primary recommended substitute, offering active product status with full electrical and mechanical compatibility. This part maintains all critical parameters including output current specifications, supply voltage range, operating temperature, and 16-SOIC packaging. Both parts carry ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment.

The SN74ALS258ADR provides an alternative substitute with identical electrical specifications and packaging. However, this part is discontinued at DiGi Electronics, limiting long-term availability. Selection between SN74ALS257ADR and SN74ALS258ADR should prioritize the SN74ALS257ADR due to active product status and superior supply chain availability.

All substitute parts are certified for the same environmental and compliance requirements as the original component, supporting direct replacement in existing applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS257ADR directly replace the SN74AS258DR?

A: Yes. The SN74ALS257ADR maintains identical circuit configuration (4 x 2:1 multiplexer), output current specifications (2.6mA high, 24mA low), supply voltage range (4.5V ~ 5.5V), operating temperature (0°C ~ 70°C), and 16-SOIC package dimensions. Electrical and mechanical compatibility is complete.

Q: What is the difference between the 74AS and 74ALS logic series?

A: The 74AS and 74ALS designations indicate different logic families within the TTL/CMOS technology spectrum. Both families provide the same functional multiplexer circuit with identical electrical parameters for this application. The series designation reflects internal circuit implementation but does not affect substitution compatibility when electrical specifications match.

Q: Are there packaging differences between substitute parts?

A: All parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. Pinout and physical dimensions are identical, supporting direct PCB replacement without layout modifications.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the original SN74AS258DR. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

Q: Why is the SN74ALS257ADR recommended over the SN74ALS258ADR?

A: The SN74ALS257ADR maintains active product status with ongoing manufacturer support and supply chain availability. The SN74ALS258ADR is discontinued at DiGi Electronics, creating potential procurement challenges. Both parts are electrically equivalent; selection should prioritize availability and long-term support.