74HC243N,652 Equivalent & Substitute Parts

Part Overview

The 74HC243N,652 is a non-inverting transceiver IC manufactured by NXP USA Inc., designed for logic-level signal transmission and reception applications. This 14-DIP package device features 1 element with 4 bits per element and 3-state output capability, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

74HC243N,652

NXP USA Inc.In Stock: 100374HC243N,652 Datasheet

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CD74HC243E

Texas InstrumentsIn Stock: 1290CD74HC243E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC243N,652 is determined by the following critical parameters:

• Logic Function: Transceiver, Non-Inverting configuration with identical element and bit-per-element count (1 element, 4 bits per element)
• Output Characteristics: 3-State output type with matching current specifications (7.8mA high and low)
• Electrical Specifications: Supply voltage range 2V ~ 6V and output current ratings must be identical or superior
• Package Compatibility: 14-DIP through-hole package with 0.300" (7.62mm) pitch
• Series Alignment: 74HC logic family consistency

The CD74HC243E from Texas Instruments meets all substitution criteria as an active product within the same 74HC series, maintaining functional and electrical equivalence while offering extended temperature range capability.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC243E from Texas Instruments is a direct functional equivalent to the 74HC243N,652. Selection of the substitute part is justified by the following factors:

• Product Status: The original NXP part is obsolete, while the Texas Instruments equivalent maintains active production status, ensuring long-term availability and supply chain continuity.
• Electrical Equivalence: All critical electrical parameters—supply voltage, output current, logic function, and output type—are identical between the two parts.
• Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for equivalent component substitution.
• Temperature Range: The Texas Instruments part extends the lower operating temperature limit to -55°C, providing enhanced performance margin in cold-temperature applications compared to the original -40°C specification.
• Package Compatibility: Identical 14-DIP through-hole packaging ensures direct PCB layout compatibility without redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC243E be used as a direct replacement for the 74HC243N,652 in existing designs?

A: Yes. The CD74HC243E is functionally and electrically equivalent. Both parts share identical logic configuration, output characteristics, supply voltage range, and package specifications. Direct substitution is possible without circuit modification.

Q: What is the primary reason for substituting the 74HC243N,652?

A: The original NXP part is classified as obsolete. The Texas Instruments CD74HC243E provides an active, production-supported alternative with identical electrical specifications.

Q: Are there any temperature-related differences between these parts?

A: The CD74HC243E operates from -55°C to 125°C, while the original part operates from -40°C to 125°C. The Texas Instruments part provides an extended lower temperature range, which is beneficial for applications requiring enhanced cold-temperature performance.

Q: Do both parts use the same package?

A: Yes. Both the 74HC243N,652 and CD74HC243E use a 14-DIP through-hole package with 0.300" (7.62mm) pitch, ensuring identical PCB footprint and mounting compatibility.

Q: Are compliance certifications equivalent between the two parts?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting identical regulatory and environmental standards.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are: 74HC series logic family, non-inverting transceiver function, 1 element with 4 bits per element, 3-state output type, 7.8mA output current (high and low), 2V to 6V supply voltage range, and 14-DIP package configuration. The CD74HC243E matches all these specifications.