74HCT125N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT125N,652 is a non-inverting buffer logic IC manufactured by NXP USA Inc., featuring 4 elements with 1 bit per element and 3-state output capability. This 14-DIP through-hole component operates across a 4.5V to 5.5V supply voltage range and is rated for -40°C to 125°C operating temperature. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Output Type	3-State
Current - Output High, Low	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT125N,652 is determined by the following critical parameters:

Logic type and functional configuration (Buffer, Non-Inverting, 4 elements, 1 bit per element, 3-state output)
Output current specifications (6mA high and low)
Supply voltage range (4.5V ~ 5.5V)
Package compatibility (14-DIP form factor for through-hole mounting)

Substitute parts must maintain identical logic functionality and electrical performance within these parameters. Variations in operating temperature range, product status, compliance certifications, and packaging format (DIP vs. SOIC) are permitted when the core electrical and functional specifications align.

Parameter Comparison

Parameter	74HCT125N,652 (NXP)	SN74HCT125N (Texas Instruments)	CD74HCT125E (Harris)	74HCT125D,653 (NXP)
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	6mA, 6mA	6mA, 6mA	6mA, 6mA	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	14-DIP	14-DIP	14-DIP	14-SOIC
Product Status	Obsolete	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	Not specified

Engineering Selection Recommendations

SN74HCT125N (Texas Instruments) is the primary direct substitute for through-hole DIP applications. This part maintains identical package form factor (14-DIP), electrical specifications, and RoHS3 compliance. The operating temperature range (-40°C to 85°C) is narrower than the original part; applications requiring operation above 85°C must evaluate thermal requirements independently.

74HCT125D,653 (NXP) is the manufacturer-recommended alternative for new designs and represents an active product with full compliance status. This part uses surface-mount SOIC packaging (14-SO) rather than through-hole DIP, requiring PCB redesign and assembly process changes. It maintains the full -40°C to 125°C operating temperature range and identical electrical performance.

CD74HCT125E (Harris Corporation) is functionally equivalent but carries obsolete product status and RoHS non-compliance. This part offers the widest operating temperature range (-55°C to 125°C) and is suitable only for legacy system maintenance where existing inventory exists.

For new designs, SN74HCT125N is preferred for through-hole applications. For surface-mount implementations or long-term supply assurance, 74HCT125D,653 is recommended.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT125N directly replace 74HCT125N,652 in existing PCB designs?

A: Yes. Both parts use identical 14-DIP through-hole packaging and maintain the same pinout, electrical specifications, and output current ratings. No PCB modifications are required. The narrower operating temperature range of SN74HCT125N (-40°C to 85°C versus -40°C to 125°C) must be verified against application requirements.

Q: What is the primary difference between SN74HCT125N and 74HCT125D,653?

A: The primary difference is packaging format. SN74HCT125N uses 14-DIP through-hole mounting, while 74HCT125D,653 uses 14-SOIC surface-mount packaging. Both maintain identical electrical specifications and supply voltage range. 74HCT125D,653 is the active product with current manufacturing support.

Q: Is CD74HCT125E suitable for new production designs?

A: CD74HCT125E is not recommended for new designs. The part carries obsolete product status and RoHS non-compliance. It is suitable only for legacy system repairs where existing inventory is available and regulatory compliance is not a requirement.

Q: Are all substitute parts RoHS compliant?

A: SN74HCT125N and 74HCT125D,653 are ROHS3 compliant. CD74HCT125E is RoHS non-compliant. Compliance requirements must be verified against application and regulatory standards.

Q: Can 74HCT125D,653 be used as a drop-in replacement for through-hole applications?

A: No. 74HCT125D,653 requires surface-mount assembly and cannot be used in through-hole sockets. PCB redesign and assembly process changes are necessary. This part is suitable for new designs or complete board redesigns.

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