74ABT125CSC Equivalent & Substitute Parts

Part Overview

The 74ABT125CSC 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. The 74ABT125 series provides buffering functionality suitable for logic-level signal distribution in digital circuits operating within the 4.5V to 5.5V supply range.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT125CSC
Manufacturer	onsemi
Series	74ABT
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)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ABT125CSC are classified based on the following substitution criteria:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications:

Logic type: Buffer, Non-Inverting
Number of elements: 4
Number of bits per element: 1
Output type: 3-State
Current ratings: 32mA (high), 64mA (low)
Supply voltage: 4.5V ~ 5.5V
Operating temperature: -40°C ~ 85°C
Package: 14-SOIC with 0.154" (3.90mm) width
Mounting type: Surface Mount

Similar Manufacturer Substitutes maintain core electrical specifications with minor packaging or qualification variations:

Identical logic functionality and electrical parameters
Package variations: 14-SO (functionally equivalent to 14-SOIC)
Automotive-grade variants with AEC-Q100 qualification
Extended operating temperature range (-40°C ~ 125°C) available in automotive grades
Reduced output current in automotive variants (16mA high, 32mA low)

Parametric Equivalents share the same functional category and electrical operating range but may differ in base product number:

SN74ABT126D represents a parametric equivalent with identical electrical and thermal specifications

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Current (H/L)	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
74ABT125CSC	onsemi	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (3.90mm)	Obsolete	Not specified
SN74ABT125D	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (3.90mm)	Active	ROHS3 Compliant
74ABT125D,623	NXP Semiconductors	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SO (3.90mm)	Active	Not specified
SN74ABT125DR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (3.90mm)	Active	ROHS3 Compliant
SN74ABT125NSR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SO (5.30mm)	Active	ROHS3 Compliant
SN74ABT125QDRG4Q1	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	16mA / 32mA	4.5V ~ 5.5V	-40°C ~ 125°C	14-SOIC (3.90mm)	Active	ROHS3 Compliant
SN74ABT125QDRQ1	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	16mA / 32mA	4.5V ~ 5.5V	-40°C ~ 125°C	14-SOIC (3.90mm)	Active	ROHS3 Compliant
SN74ABT126D	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (3.90mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): SN74ABT125D and SN74ABT125DR from Texas Instruments are the preferred direct substitutes. Both maintain identical electrical specifications and package dimensions. SN74ABT125DR offers higher inventory availability (121,763 pcs) and is supplied in Cut Tape and Digi-Reel packaging. Both parts carry ROHS3 compliance and active product status.

Alternative Substitutes (Functionally Equivalent): 74ABT125D,623 from NXP Semiconductors provides functional equivalence with identical electrical parameters. The 14-SO package is mechanically compatible with 14-SOIC footprints in most applications. This part is actively manufactured with substantial inventory (4,334 pcs).

Automotive-Grade Alternatives: SN74ABT125QDRG4Q1 and SN74ABT125QDRQ1 are automotive-qualified variants (AEC-Q100) with extended operating temperature range (-40°C ~ 125°C). These parts feature reduced output current specifications (16mA high, 32mA low) and should be selected only when automotive qualification is required and reduced drive capability is acceptable for the application.

Packaging Considerations: SN74ABT125NSR features a wider 14-SO package (5.30mm width) compared to the standard 3.90mm width. This part is suitable for applications where package width is not a constraint and Tape & Reel packaging is preferred.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT125D directly replace 74ABT125CSC? A: Yes. SN74ABT125D from Texas Instruments is a direct substitute with identical logic type, element count, output current ratings, supply voltage, operating temperature range, and 14-SOIC package dimensions. The part is actively manufactured and ROHS3 compliant.

Q: What is the difference between 14-SOIC and 14-SO packages? A: Both designations refer to 14-pin small-outline packages with identical pin pitch and electrical compatibility. The primary difference is package width: standard 14-SOIC is 3.90mm wide, while some 14-SO variants (such as SN74ABT125NSR) may be 5.30mm wide. Footprint compatibility depends on PCB design specifications.

Q: Are automotive-grade variants (QDRG4Q1, QDRQ1) suitable for non-automotive applications? A: Automotive-grade parts are suitable for non-automotive use but feature reduced output current (16mA high, 32mA low) compared to standard variants (32mA high, 64mA low). Selection should be based on actual circuit drive requirements. Extended temperature range (-40°C ~ 125°C) is available as an additional benefit.

Q: Why is 74ABT125CSC listed as obsolete? A: The onsemi 74ABT125CSC has reached end-of-life status. Active substitutes from Texas Instruments and NXP Semiconductors provide equivalent functionality with ongoing manufacturing support and improved compliance certifications.

Q: What is the difference between SN74ABT125D and SN74ABT125DR? A: Both parts are electrically identical. SN74ABT125D is supplied in Tube packaging, while SN74ABT125DR is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Is SN74ABT126D a direct substitute or a different part? A: SN74ABT126D is a parametric equivalent with identical electrical and thermal specifications. The base product number differs (74ABT126 vs. 74ABT125), but functional performance in buffering applications is equivalent. Consult device datasheets for any functional differences in control pin configuration.

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