SN74AS757DW Equivalent & Substitute Parts

Part Overview

The SN74AS757DW is a Buffer, Non-Inverting logic integrated circuit manufactured by Texas Instruments, designed for 2 Element 4 Bit per Element configurations with Open Collector Output in a 20-SOIC package. This component operates within the 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74AS757DW
Manufacturer	Texas Instruments
Logic Type	Buffer, Non-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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AS757DW are qualified based on the following critical parameters that must remain constant across all equivalent devices:

Logic Type: Buffer, Non-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
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitutes are differentiated by series designation (74AS vs. 74BCT), packaging format (Tube vs. Tape & Reel), and product status (Active vs. Last Time Buy). All qualified substitutes maintain identical electrical and mechanical specifications.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Inventory (Pcs)	Logic Type	Elements / Bits	Output Type	Supply Voltage	Operating Temp	Package
SN74AS757DW	74AS	Tube	Last Time Buy	828	Buffer, Non-Inverting	2 / 4	Open Collector	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC
SN74AS757DWR	74AS	Tape & Reel	Active	974	Buffer, Non-Inverting	2 / 4	Open Collector	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC
SN74BCT760DW	74BCT	Tube	Last Time Buy	3400	Buffer, Non-Inverting	2 / 4	Open Collector	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC
SN74AS760DW	74AS	Tube	Last Time Buy	1047	Buffer, Non-Inverting	2 / 4	Open Collector	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC
SN74BCT757DW	74BCT	Tube	Active	821	Buffer, Non-Inverting	2 / 4	Open Collector	4.5V ~ 5.5V	0°C ~ 70°C	20-SOIC

Engineering Selection Recommendations

For applications currently using SN74AS757DW, the following selection criteria apply:

Preferred Substitute (MFR Recommended): SN74AS757DWR maintains identical series designation (74AS) and electrical specifications while offering Active product status and Tape & Reel packaging. This part provides the highest compatibility with existing designs and ensures long-term availability.

Series-Compatible Alternatives: SN74BCT757DW and SN74BCT760DW are parametric equivalents within the 74BCT series. Both maintain all critical electrical and mechanical parameters. SN74BCT757DW carries Active product status, while SN74BCT760DW offers higher inventory availability (3400 units).

Same-Series Alternatives: SN74AS760DW remains within the 74AS series with Last Time Buy status, providing design continuity for applications requiring series consistency.

All substitute parts comply with ROHS3 and maintain MSL Level 1 (Unlimited) moisture sensitivity ratings. Selection should prioritize product status (Active vs. Last Time Buy) and packaging requirements (Tube vs. Tape & Reel) based on procurement and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SN74BCT757DW replace SN74AS757DW directly? A: Yes. Both parts share identical electrical specifications including logic type, element configuration, output type, supply voltage, operating temperature, and 20-SOIC package. The primary difference is series designation (74BCT vs. 74AS), which does not affect functional compatibility for this buffer application.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging is suitable for manual handling and smaller volume orders, while Tape & Reel packaging is optimized for automated assembly processes. Both formats contain identical components in the same 20-SOIC package. Selection depends on manufacturing process requirements.

Q: Why is SN74AS757DWR recommended over SN74AS757DW? A: SN74AS757DWR carries Active product status, ensuring continued availability and support from Texas Instruments. SN74AS757DW is in Last Time Buy status, indicating limited future availability. Both parts are electrically and mechanically identical; the recommendation prioritizes long-term supply chain stability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 Compliant status and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original SN74AS757DW specifications.

Q: Can I use SN74AS760DW as a substitute? A: Yes. SN74AS760DW meets all critical electrical and mechanical parameters. It remains within the 74AS series and maintains the same 20-SOIC package, supply voltage, operating temperature, and output specifications. The primary consideration is Last Time Buy status for both the original and this alternative.

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