74F125SC Equivalent & Substitute Parts

Part Overview

The 74F125SC 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, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74F125SC operates within a 4.5V to 5.5V supply voltage range and is housed in a 14-SOIC surface mount package.

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	15mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74F125SC is determined by strict equivalence across the following critical parameters: logic type (Buffer, Non-Inverting), number of elements (4), bits per element (1), output type (3-State), output current specifications (15mA high, 64mA low), supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and package type (14-SOIC with 0.154" width).

Substitute parts are categorized as follows:

Direct Manufacturer Equivalent: SN74F125DR maintains identical electrical and mechanical specifications with active product status and RoHS3 compliance.

Similar Manufacturer Equivalent: SN74F125NSR provides functional equivalence with identical electrical parameters but differs in package width (0.209" vs. 0.154"), classified as 14-SO versus 14-SOIC.

Parametric Equivalents: SN74BCT125AD, SN74F125D, and SN74F126D maintain all critical electrical parameters and 14-SOIC package dimensions but represent different product series or status classifications.

Parameter Comparison

Parameter	74F125SC (Main)	SN74F125DR	SN74F125NSR	SN74BCT125AD	SN74F125D	SN74F126D
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-SOIC (0.154")	14-SOIC (0.154")	14-SO (0.209")	14-SOIC (0.154")	14-SOIC (0.154")	14-SOIC (0.154")
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Last Time Buy	Last Time Buy	Last Time Buy
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection: SN74F125DR is the recommended direct substitute. It maintains identical electrical specifications, package dimensions, and mounting type while offering active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Alternative Selection: SN74F125NSR provides functional equivalence with active product status and ROHS3 compliance. The package width difference (0.209" versus 0.154") requires PCB layout verification to confirm footprint compatibility before implementation.

Secondary Options: SN74BCT125AD, SN74F125D, and SN74F126D are parametric equivalents with identical electrical and mechanical specifications. These parts carry Last Time Buy status, indicating limited future availability. Selection should prioritize current inventory requirements and long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can SN74F125NSR be used as a direct replacement for 74F125SC?

A: SN74F125NSR is functionally equivalent with identical electrical parameters. However, the package width differs (0.209" versus 0.154"), requiring PCB footprint verification. If the PCB layout accommodates the wider 14-SO package, electrical substitution is valid.

Q: What is the difference between 74F and 74BCT series buffers?

A: Both series maintain identical electrical specifications for this application (4.5V ~ 5.5V supply, 15mA/64mA output current, 3-state output). The 74BCT series represents a different product line. Selection depends on availability and supply chain requirements.

Q: Why is SN74F125DR preferred over other substitutes?

A: SN74F125DR is the only active product with identical package dimensions (14-SOIC 0.154" width), ensuring direct PCB compatibility without layout modifications. Active status guarantees ongoing availability and support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SN74F125DR, SN74F125NSR, SN74BCT125AD, SN74F125D, and SN74F126D are all ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What is the impact of Last Time Buy status on SN74BCT125AD, SN74F125D, and SN74F126D?

A: Last Time Buy status indicates these parts will not be manufactured beyond a specified date. Current inventory is available, but future procurement will not be possible. These parts should be selected only if immediate requirements are met and long-term supply is not critical.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes. All substitute parts, including the main part 74F125SC, have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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