74ACT125SCX Equivalent & Substitute Parts

Part Overview

The 74ACT125SCX is a non-inverting buffer logic IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The 14-SOIC surface mount package and 4.5V to 5.5V supply voltage range define its operational parameters in digital logic applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT125SCX
Manufacturer	onsemi
Series	74ACT
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	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 74ACT125SCX are identified based on strict parametric equivalence across the following critical criteria:

Primary Equivalence Parameters:

Logic type: Buffer, Non-Inverting
Number of elements: 4
Number of bits per element: 1
Output type: 3-State
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Voltage - Supply: 4.5V ~ 5.5V
Moisture Sensitivity Level: 1 (Unlimited)

Substitute Categories:

Category 1: Direct Parametric Equivalents (onsemi 74ACT Series) MC74ACT125DG and MC74ACT125DR2G maintain identical electrical specifications including 24mA output current, operating temperature range of -40°C to 85°C, and 14-SOIC packaging. These parts differ only in packaging format (Tube vs. Tape & Reel) and product status (Active vs. Obsolete).

Category 2: Parametric Equivalent with Extended Temperature Range (onsemi Automotive Grade) NLV74ACT125DR2G provides identical core functionality with automotive-grade qualification (AEC-Q100) and extended availability in Tape & Reel format. This part maintains the same electrical specifications but carries obsolete product status.

Category 3: Logic Family Variant (Nexperia 74AHCT Series) 74AHCT125D,118 represents a logic family variant with reduced output current (8mA vs. 24mA) and extended operating temperature range (-40°C to 125°C). This part is manufactured by Nexperia USA Inc. and carries active product status.

Parameter Comparison

Parameter	74ACT125SCX	MC74ACT125DG	MC74ACT125DR2G	NLV74ACT125DR2G	74AHCT125D,118
Manufacturer	onsemi	onsemi	onsemi	onsemi	Nexperia USA Inc.
Series	74ACT	74ACT	74ACT	74ACT	74AHCT
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4	4
Number of Bits per Element	1	1	1	1	1
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	8mA, 8mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Obsolete	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): MC74ACT125DG and MC74ACT125DR2G are the primary substitutes for 74ACT125SCX. Both maintain identical output current specifications (24mA) and operating temperature range (-40°C to 85°C). MC74ACT125DG is available in Tube packaging, while MC74ACT125DR2G is supplied in Tape & Reel format. Both parts carry active product status, ensuring long-term availability and supply chain continuity.

For Automotive Applications: NLV74ACT125DR2G provides automotive-grade qualification (AEC-Q100) with identical electrical specifications. This part is suitable for applications requiring automotive-grade components and is available in Tape & Reel packaging. Product status is obsolete.

For Extended Temperature Range Applications: 74AHCT125D,118 from Nexperia USA Inc. extends the operating temperature range to -40°C to 125°C and carries active product status. This part features reduced output current (8mA vs. 24mA), which must be evaluated against circuit load requirements. The 74AHCT logic family variant is appropriate for applications requiring higher temperature operation within the 4.5V to 5.5V supply range.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT125DG directly replace 74ACT125SCX? A: Yes. MC74ACT125DG maintains identical electrical specifications including 24mA output current, -40°C to 85°C operating temperature, and 14-SOIC packaging. The only difference is packaging format (Tube vs. the original part's format) and active product status.

Q: What is the difference between MC74ACT125DG and MC74ACT125DR2G? A: Both parts are electrically identical. MC74ACT125DG is supplied in Tube packaging, while MC74ACT125DR2G is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and procurement volume.

Q: Can 74AHCT125D,118 be used as a substitute? A: 74AHCT125D,118 is a logic family variant with reduced output current (8mA vs. 24mA) and extended operating temperature range (-40°C to 125°C). It is suitable only if circuit load requirements are compatible with 8mA output current and if the extended temperature range is beneficial or required.

Q: Why is NLV74ACT125DR2G marked as obsolete? A: NLV74ACT125DR2G carries obsolete product status despite maintaining identical electrical specifications to the original part. For new designs requiring long-term availability, MC74ACT125DR2G (active status) is the preferred substitute.

Q: Are all substitute parts RoHS3 compliant? A: MC74ACT125DG, MC74ACT125DR2G, NLV74ACT125DR2G, and 74AHCT125D,118 are all ROHS3 compliant. The original 74ACT125SCX does not specify RoHS status.

Q: What is the MSL rating for these parts? A: All parts, including the original 74ACT125SCX and all substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage and handling.

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