74HC126N,652 Equivalent & Substitute Parts

Part Overview

The 74HC126N,652 is a non-inverting buffer logic integrated circuit manufactured by NXP Semiconductors in a 14-DIP package. This component functions as a 4-element buffer with 3-state output capability, designed for digital logic applications requiring signal buffering and output control. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring active product availability.

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	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74HC126N,652 is determined by strict equivalence across the following critical parameters:

Logic function: Non-inverting buffer with 4 elements, 1 bit per element
Output configuration: 3-state output capability
Electrical performance: 7.8mA output current (high and low), 2V to 6V supply voltage range
Physical form factor: 14-DIP package with 0.300" (7.62mm) pitch
Through-hole mounting compatibility

All substitute parts listed maintain identical logic functionality and electrical specifications. Variations in operating temperature range, product status, and compliance certifications are noted but do not affect functional interchangeability within the specified parameter envelope.

Parameter Comparison

Parameter	74HC126N,652 (NXP)	CD74HC126E (Harris)	SN74HC126N (TI)	TC74HC126AP(F) (Toshiba)
Manufacturer	NXP Semiconductors	Harris Corporation	Texas Instruments	Toshiba Semiconductor and Storage
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	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

For applications requiring the 74HC126N,652, the following selection criteria apply based on product status and compliance requirements:

Active Product Availability: SN74HC126N (Texas Instruments) and TC74HC126AP(F) (Toshiba Semiconductor and Storage) are both active products with current manufacturing status. These parts are recommended for new designs and ongoing production requiring assured supply.

RoHS Compliance: SN74HC126N and TC74HC126AP(F) both meet RoHS compliance requirements. The CD74HC126E is RoHS non-compliant and should not be selected for applications with RoHS mandates.

Operating Temperature Range: The original 74HC126N,652 specifies -40°C to 125°C operation. SN74HC126N and TC74HC126AP(F) operate to -40°C to 85°C, representing a narrower high-temperature range. CD74HC126E extends to -55°C on the low end and 125°C on the high end. Temperature range selection depends on specific application requirements.

Functional Equivalence: All four parts maintain identical logic function, electrical performance, and physical form factor. Selection between active substitutes is determined by supply availability, compliance certifications, and temperature operating range requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC126N directly replace the 74HC126N,652 in existing designs?

A: Yes. The SN74HC126N maintains identical logic function, output current specifications, supply voltage range, and 14-DIP package form factor. The narrower operating temperature range (-40°C to 85°C versus -40°C to 125°C) must be verified against application requirements.

Q: What is the difference between the CD74HC126E and the active substitutes?

A: The CD74HC126E is an obsolete product with RoHS non-compliance status. While electrically equivalent, it offers no supply advantage over the original part and does not meet modern compliance requirements. Active substitutes (SN74HC126N and TC74HC126AP(F)) are preferred.

Q: Are all substitute parts pin-compatible with the 74HC126N,652?

A: Yes. All substitute parts use the 14-DIP package with 0.300" (7.62mm) pitch, ensuring direct pin compatibility and through-hole mounting compatibility.

Q: Which substitute should be selected for new production designs?

A: SN74HC126N (Texas Instruments) or TC74HC126AP(F) (Toshiba Semiconductor and Storage) are both active products meeting ROHS3 or RoHS compliance. Selection depends on supply chain availability and specific operating temperature requirements within the -40°C to 85°C range.

Q: Does the CD74HC126E offer any advantage despite obsolete status?

A: The CD74HC126E provides extended high-temperature operation to 125°C. However, this advantage is offset by obsolete product status, RoHS non-compliance, and limited supply availability compared to active alternatives.

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