74ABT125CSJ Equivalent & Substitute Parts

Part Overview

The 74ABT125CSJ is a non-inverting buffer IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates within a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Key Parameters

Parameter	Specification
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ABT125CSJ is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Substitutes maintain all electrical parameters and package compatibility with the main part, differing only in manufacturer, packaging format, or product status (active vs. obsolete).

Parametric Equivalents maintain core electrical functionality but may differ in output current ratings or operating temperature range, requiring design verification for specific applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package / Case	Current - Output High, Low	Operating Temperature	Inventory (Pcs)
74ABT125CSJ	onsemi	Obsolete	14-SOIC (0.209", 5.30mm Width)	32mA, 64mA	-40°C ~ 85°C	860
74ABT125D,623	NXP Semiconductors	Active	14-SOIC (0.154", 3.90mm Width)	32mA, 64mA	-40°C ~ 85°C	4334
SN74ABT125D	Texas Instruments	Active	14-SOIC (0.154", 3.90mm Width)	32mA, 64mA	-40°C ~ 85°C	2460
SN74ABT125DR	Texas Instruments	Active	14-SOIC (0.154", 3.90mm Width)	32mA, 64mA	-40°C ~ 85°C	121763
SN74ABT125NSR	Texas Instruments	Active	14-SOIC (0.209", 5.30mm Width)	32mA, 64mA	-40°C ~ 85°C	2881
SN74ABT125QDRG4Q1	Texas Instruments	Active	14-SOIC (0.154", 3.90mm Width)	16mA, 32mA	-40°C ~ 125°C	13650
SN74ABT125QDRQ1	Texas Instruments	Active	14-SOIC (0.154", 3.90mm Width)	16mA, 32mA	-40°C ~ 125°C	2417
SN74ABT125NS	Texas Instruments	Active	14-SOIC (0.209", 5.30mm Width)	32mA, 64mA	-40°C ~ 85°C	1921
SN74ABT126NS	Texas Instruments	Active	14-SOIC (0.209", 5.30mm Width)	32mA, 64mA	-40°C ~ 85°C	638

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Thermal Performance):

SN74ABT125NSR and SN74ABT125NS are recommended as primary substitutes. Both are manufactured by Texas Instruments with active product status, maintain the 14-SOIC (0.209", 5.30mm Width) package footprint, and deliver identical output current ratings (32mA, 64mA) and operating temperature range (-40°C to 85°C). SN74ABT125NSR offers significantly higher inventory availability (121,763 pcs in cut tape format).

For Alternative Package Footprints (Reduced PCB Space):

SN74ABT125D and SN74ABT125DR utilize the 14-SOIC (0.154", 3.90mm Width) package, reducing board area while maintaining electrical equivalence. SN74ABT125DR provides the highest inventory level (121,763 pcs) among all substitutes.

For Extended Temperature Range Applications:

SN74ABT125QDRG4Q1 and SN74ABT125QDRQ1 extend the operating temperature to -40°C to 125°C and include AEC-Q100 automotive qualification. These parts feature reduced output current ratings (16mA, 32mA) and are suitable for automotive and high-temperature environments where the main part's thermal range is insufficient.

For NXP-Based Supply Chains:

74ABT125D,623 from NXP Semiconductors provides an active alternative with identical electrical parameters and the compact 14-SOIC (0.154", 3.90mm Width) package.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT125QDRG4Q1 replace the 74ABT125CSJ in all applications?

A: SN74ABT125QDRG4Q1 maintains functional equivalence but features reduced output current ratings (16mA, 32mA versus 32mA, 64mA) and extended operating temperature (-40°C to 125°C). Applications requiring the full 64mA output current or operating strictly within -40°C to 85°C should use direct substitutes with matching current specifications.

Q: What is the difference between SN74ABT125NSR and SN74ABT125NS?

A: Both parts are electrically identical with matching package footprints (14-SOIC, 0.209", 5.30mm Width) and output current ratings. The primary difference is packaging format: SN74ABT125NSR is supplied in cut tape and Digi-Reel format, while SN74ABT125NS is supplied in tube format.

Q: Are the smaller package variants (0.154" width) pin-compatible with the 74ABT125CSJ?

A: Yes. Parts such as SN74ABT125D and SN74ABT125DR use the 14-SOIC (0.154", 3.90mm Width) package, which maintains identical pin count and pinout. The reduced package width allows for more compact PCB layouts without affecting electrical compatibility.

Q: Which substitute offers the best long-term availability?

A: SN74ABT125DR from Texas Instruments provides the highest inventory level (121,763 pcs) with active product status and RoHS3 compliance, ensuring sustained availability for production and design continuity.

Q: Is the 74ABT125D,623 from NXP a suitable alternative for cost-sensitive designs?

A: Yes. The 74ABT125D,623 maintains all electrical parameters of the 74ABT125CSJ with active product status and REACH compliance. The compact 14-SOIC (0.154", 3.90mm Width) package may provide additional cost benefits through reduced PCB area.

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