SN74ABT657ADWR Equivalent & Substitute Parts

Part Overview

The SN74ABT657ADWR is a non-inverting transceiver logic IC manufactured by Texas Instruments, designed for 8-bit data transmission with 3-state output capability. Operating within a 4.5V to 5.5V supply range, this component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Series	74ABT
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High	32mA
Current - Output Low	64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74ABT657ADWR is determined by strict equivalence across the following critical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 32mA, 64mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 24-SOIC (0.295", 7.50mm Width)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Substitutes differ only in product status (active vs. obsolete/discontinued) and packaging format (Tape & Reel vs. standard packaging).

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements / Bits	Output Type	Current (High/Low)	Supply Voltage	Temp Range	Package	Packaging Format	Inventory
SN74ABT657ADWR	Texas Instruments	Obsolete	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Standard	2430 Pcs
SN74ABT543ADWR	Texas Instruments	Active	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Standard	11100 Pcs
SN74ABT646ADWR	Texas Instruments	Active	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Tape & Reel (TR)	2788 Pcs
SN74ABT646DWR	Texas Instruments	Active	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Tape & Reel (TR)	899 Pcs
SN74ABT652ADWR	Texas Instruments	Active	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Tape & Reel (TR)	4823 Pcs
SN74ABT652DWR	Texas Instruments	Discontinued at DiGi Electronics	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Standard	1014 Pcs
SN74ABT2952ADWR	Texas Instruments	Active	Transceiver, Non-Inverting	1 / 8	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	24-SOIC	Tape & Reel (TR)	735 Pcs

Engineering Selection Recommendations

For replacement of the obsolete SN74ABT657ADWR, the following active alternatives are recommended based on product status and compliance:

Primary Recommendations (Active Status, Standard Packaging):

SN74ABT543ADWR: Highest inventory availability (11100 Pcs), active product status, standard packaging format suitable for direct board-level substitution.

Secondary Recommendations (Active Status, Tape & Reel Packaging):

SN74ABT652ADWR: Largest inventory among Tape & Reel options (4823 Pcs), active product status, suitable for high-volume production environments.
SN74ABT646ADWR: Active product status with substantial inventory (2788 Pcs), Tape & Reel format for automated assembly.
SN74ABT2952ADWR: Active product status, Tape & Reel format, lower inventory (735 Pcs).

Alternative (Discontinued Status):

SN74ABT652DWR: Discontinued at DiGi Electronics, standard packaging, limited inventory (1014 Pcs). Use only when other active alternatives are unavailable.

All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT543ADWR directly replace SN74ABT657ADWR in existing designs? A: Yes. Both parts share identical electrical specifications (supply voltage, output current, operating temperature range) and mechanical packaging (24-SOIC). No circuit modifications are required.

Q: What is the difference between standard packaging and Tape & Reel (TR) format? A: Standard packaging is suitable for manual handling and small-quantity assembly. Tape & Reel format is optimized for automated pick-and-place equipment in high-volume production. Electrical and mechanical specifications remain identical.

Q: Why is SN74ABT657ADWR marked as obsolete? A: Obsolete status indicates the manufacturer has discontinued production. Active alternatives with identical specifications are available to support ongoing design requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, meeting current environmental and reliability standards.

Q: Which substitute has the best availability? A: SN74ABT543ADWR offers the highest inventory (11100 Pcs) with active product status and standard packaging format.

Q: Can I use Tape & Reel packaged parts in manual assembly? A: Tape & Reel format is designed for automated assembly. Manual assembly is possible but less efficient. Standard packaging format is recommended for manual board-level work.

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