74HCT238N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT238N,652 is a decoder/demultiplexer integrated circuit manufactured by NXP USA Inc., featuring a 1 x 3:8 configuration in a 16-DIP package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. The decoder/demultiplexer function enables selection of one of eight output lines based on three input address lines, commonly used in address decoding and signal routing applications.

Substiute Parts

74HCT238N,652

NXP USA Inc.In Stock: 93774HCT238N,652 Datasheet

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CD74HCT238E

Texas InstrumentsIn Stock: 1393CD74HCT238E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT238N,652 is determined by the following critical parameters:

Functional Equivalence: The substitute part must maintain identical decoder/demultiplexer configuration (1 x 3:8) and circuit topology.

Electrical Compatibility: Output current ratings (4mA high, 4mA low) and supply voltage range (4.5V ~ 5.5V) must be matched or exceeded.

Package Compatibility: The 16-DIP through-hole package with 0.300" (7.62mm) pitch is mandatory for direct board-level substitution without layout modifications.

Logic Family Alignment: Both parts belong to the 74HCT logic family, ensuring TTL-compatible input/output characteristics.

Compliance Requirements: RoHS3 compliance and REACH unaffected status must be maintained for regulatory continuity.

The CD74HCT238E from Texas Instruments satisfies all substitution criteria through identical functional specification, matching electrical parameters, and compatible packaging.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT238E from Texas Instruments is the direct functional equivalent for the obsolete 74HCT238N,652. Selection of this substitute is supported by:

Product Status: The CD74HCT238E maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete NXP part.

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements without modification to system documentation or certification.

Electrical Specification Alignment: Identical output current ratings, supply voltage range, and logic family characteristics ensure direct functional replacement without circuit redesign or performance degradation.

Temperature Performance: The CD74HCT238E extends the lower operating temperature limit to -55°C, providing enhanced performance margin in applications requiring extended temperature range operation.

Package Continuity: Identical 16-DIP through-hole packaging eliminates the need for PCB layout modifications or mechanical redesign.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT238E be used as a direct replacement for the 74HCT238N,652 without circuit modifications?

A: Yes. Both components share identical decoder/demultiplexer configuration, output current specifications, supply voltage range, and 16-DIP package dimensions. Direct pin-for-pin substitution is supported without circuit alterations.

Q: What is the primary reason for substituting the 74HCT238N,652?

A: The 74HCT238N,652 is classified as obsolete. The CD74HCT238E provides an active production alternative with equivalent electrical and functional specifications.

Q: Are there any compliance or certification differences between these parts?

A: Both components maintain ROHS3 compliance and REACH unaffected status. No compliance-related restrictions apply to substitution.

Q: Does the CD74HCT238E support the same operating temperature range?

A: The CD74HCT238E extends the lower temperature limit to -55°C compared to the -40°C minimum of the 74HCT238N,652. The upper limit of 125°C is identical. This represents an improvement in temperature performance margin.

Q: Is the 16-DIP package identical between both parts?

A: Yes. Both components use the 16-DIP package with 0.300" (7.62mm) pitch, enabling direct board-level substitution without mechanical redesign.

Q: What output current capability should be expected from the CD74HCT238E?

A: The CD74HCT238E provides 4mA output current for both high and low states, matching the specification of the 74HCT238N,652.