SN74AS756DWR Equivalent & Substitute Parts

Part Overview

The SN74AS756DWR is a logic buffer IC manufactured by Texas Instruments, classified as a Buffer, Inverting component with 2 elements and 4 bits per element. This device features open collector output configuration and operates within the 4.5V to 5.5V supply voltage range. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement planning.

Substiute Parts

SN74AS756DWR

Texas InstrumentsIn Stock: 2441SN74AS756DWR Datasheet

Current PartRFQ

SN74BCT756DWR

Texas InstrumentsIn Stock: 896SN74BCT756DWR Datasheet

Parametric EquivalentRFQ

SN74AS756DW

Texas InstrumentsIn Stock: 803SN74AS756DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AS756DWR are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: Open Collector
• Current - Output Low: 64mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

All identified substitute parts maintain these electrical and mechanical specifications, ensuring functional and physical compatibility within the original design envelope.

Parameter Comparison

Engineering Selection Recommendations

SN74AS756DW (MFR Recommended): This part is the manufacturer-recommended substitute and maintains active product status. It is identical to the main part in all electrical and mechanical specifications, with the distinction of tube packaging and current availability. This option provides the highest assurance of long-term supply continuity and is the preferred selection for new procurement.

SN74BCT756DWR (Parametric Equivalent): This part meets all critical electrical and mechanical parameters required for functional substitution. While listed as discontinued at DiGi Electronics, it remains available through alternative distribution channels. The 74BCT series designation indicates a different logic family implementation, though all specified parameters remain equivalent to the original design.

Both substitute parts carry ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the original component.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS756DW be used as a direct replacement for the SN74AS756DWR?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is packaging format (tube versus reel). The SN74AS756DW is the manufacturer-recommended substitute and maintains active product status.

Q: What is the difference between the 74AS and 74BCT series designations?

A: The series designation indicates the logic family implementation. The SN74BCT756DWR belongs to the 74BCT family while the main part belongs to the 74AS family. All specified electrical parameters, including output current, supply voltage, and operating temperature, remain identical between these parts.

Q: Are all substitute parts available in the same 20-SOIC package?

A: Yes. All identified substitute parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring physical compatibility with the original PCB design.

Q: Do the substitute parts meet the same environmental and regulatory requirements?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original component.

Q: Which substitute part should be selected for new designs?

A: The SN74AS756DW is the manufacturer-recommended option and maintains active product status, making it the preferred choice for new procurement and design support.