74AC125SCX Equivalent & Substitute Parts

Part Overview

The 74AC125SCX 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 74AC125SCX operates across a supply voltage range of 2V to 6V with output current capabilities of 24mA for both high and low states. It is housed in a 14-SOIC surface mount package and is rated for operating temperatures from -40°C to 85°C.

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	24mA, 24mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74AC125SCX are identified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Output Type: 3-State
Package / Case: 14-SOIC
Mounting Type: Surface Mount

Allowed Parameter Variations:

Supply Voltage: The 74AC125SCX operates at 2V ~ 6V. Substitutes operating at 2V ~ 5.5V are compatible for applications not requiring the full 6V upper limit.
Output Current: Substitutes with lower output current (8mA vs. 24mA) are acceptable only for applications with reduced current requirements.
Operating Temperature: Extended temperature ranges are acceptable substitutes.
Product Status: Active status substitutes are preferred over obsolete parts.
Packaging Format: Tube, Tape & Reel, and Cut Tape formats are interchangeable for the same base package type.

Parameter Comparison

Parameter	74AC125SCX	MC74AC125DG	MC74AC125DR2G	74AHC125D,118
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4
Number of Bits per Element	1	1	1	1
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	8mA, 8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TA)
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

MC74AC125DG and MC74AC125DR2G (onsemi): These parts are direct parametric equivalents to the 74AC125SCX, maintaining identical electrical specifications including 24mA output current and 2V ~ 6V supply voltage range. Both are manufactured by onsemi and carry Active product status with ROHS3 compliance. MC74AC125DG is supplied in Tube format, while MC74AC125DR2G is supplied in Tape & Reel format. Selection between these two depends on procurement and assembly requirements.

74AHC125D,118 (Nexperia USA Inc.): This part is functionally equivalent but with reduced output current (8mA vs. 24mA) and a lower maximum supply voltage (5.5V vs. 6V). The 74AHC125D,118 offers an extended operating temperature range (-40°C ~ 125°C) and is available in higher inventory quantities. This substitute is suitable for applications that do not require the full 24mA output current or 6V supply voltage operation.

All substitute parts maintain the same 14-SOIC package footprint and surface mount mounting type, ensuring mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can MC74AC125DG directly replace 74AC125SCX in existing designs? A: Yes. MC74AC125DG is a direct parametric equivalent with identical electrical specifications, including output current (24mA), supply voltage range (2V ~ 6V), and operating temperature range (-40°C ~ 85°C). The only difference is product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified).

Q: What is the difference between MC74AC125DG and MC74AC125DR2G? A: Both parts are electrically identical. The difference is in packaging format: MC74AC125DG is supplied in Tube format, while MC74AC125DR2G is supplied in Tape & Reel format. Selection depends on assembly line requirements and procurement preferences.

Q: Can 74AHC125D,118 be used as a substitute for 74AC125SCX? A: 74AHC125D,118 is functionally equivalent but with two parameter differences: reduced output current (8mA vs. 24mA) and lower maximum supply voltage (5.5V vs. 6V). It is suitable only for applications that do not require the full 24mA output current or operation at 6V supply voltage.

Q: Are all substitute parts RoHS compliant? A: Yes. MC74AC125DG, MC74AC125DR2G, and 74AHC125D,118 are all ROHS3 compliant. The original 74AC125SCX RoHS status was not specified.

Q: Do the substitute parts fit the same PCB footprint? A: Yes. All substitute parts use the 14-SOIC package with identical dimensions (0.154", 3.90mm Width) and surface mount mounting type, ensuring direct PCB compatibility.

Q: Which substitute part has the best availability? A: 74AHC125D,118 has the highest inventory level at 8,061 pieces. MC74AC125DR2G has 1,420 pieces, and MC74AC125DG has 1,316 pieces in stock.

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