CD74HCT238M Equivalent & Substitute Parts

Part Overview

The CD74HCT238M is a Decoder/Demultiplexer integrated circuit manufactured by Texas Instruments in the 74HCT logic series. This component functions as a 1 x 3:8 decoder/demultiplexer in a 16-SOIC surface mount package. The part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain functional equivalence through matching decoder/demultiplexer topology, electrical performance characteristics, and physical packaging compatibility.

Substiute Parts

CD74HCT238M

Texas InstrumentsIn Stock: 2659CD74HCT238M Datasheet

Current PartRFQ

CD74HCT238M96

Texas InstrumentsIn Stock: 1467CD74HCT238M96 Datasheet

DirectRFQ

74HCT02PW,118

NXP SemiconductorsIn Stock: 3199574HCT02PW,118 Datasheet

MFR RecommendedRFQ

74HCT238D,653

Nexperia USA Inc.In Stock: 624074HCT238D,653 Datasheet

MFR RecommendedRFQ

74HCT238D-Q100J

Nexperia USA Inc.In Stock: 333674HCT238D-Q100J Datasheet

MFR RecommendedRFQ

MC74HCT138ADG

onsemiIn Stock: 833MC74HCT138ADG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT238M is determined by functional and electrical equivalence within the 74HCT logic family. The critical parameters governing substitution are:

Functional Parameters:

• Decoder/Demultiplexer topology with 1 x 3:8 circuit configuration
• Single independent circuit
• Output current capability of 4mA high and 4mA low

Electrical Parameters:

• Single supply voltage operation at 4.5V ~ 5.5V
• Operating temperature range compatibility
• RoHS3 compliance and MSL Level 1 rating

Physical Parameters:

• 16-SOIC surface mount package with 0.154" (3.90mm) width
• Packaging format (Tube, Cut Tape, Tape & Reel, or Bulk)

Substitute parts are grouped into three categories based on substitution relationship: Direct Manufacturer Substitutes (same base product number with different packaging), Manufacturer Recommended Substitutes (alternative part numbers from authorized manufacturers), and Parametric Equivalents (functionally equivalent parts from alternative manufacturers).

Parameter Comparison

Engineering Selection Recommendations

CD74HCT238M96 is the primary direct substitute from Texas Instruments. This part maintains identical electrical specifications and 16-SOIC packaging while offering active product status. The difference in packaging format (Cut Tape & Digi-Reel versus Tube) does not affect functional performance and accommodates various procurement and assembly workflows.

74HCT238D,653 and 74HCT238D-Q100J are manufacturer-recommended alternatives from Nexperia USA Inc. Both parts maintain the 1 x 3:8 decoder/demultiplexer configuration, output current ratings, and supply voltage specifications. The operating temperature range is narrower (-40°C ~ 125°C versus -55°C ~ 125°C), which is acceptable for applications not requiring extended low-temperature operation. The 74HCT238D-Q100J includes AEC-Q100 automotive qualification, suitable for automotive-grade applications. Both parts carry active product status.

MC74HCT138ADG from onsemi is a parametric equivalent offering identical electrical performance and temperature range (-55°C ~ 125°C). This part is classified as obsolete but provides functional equivalence for legacy system support. The base product number differs (74HCT138 versus 74HCT238), though both implement the same 1 x 3:8 decoder/demultiplexer topology.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and surface mount 16-SOIC packaging, ensuring compatibility with existing PCB designs and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT238M96 be used as a direct replacement for CD74HCT238M?

A: Yes. CD74HCT238M96 is a direct substitute from the same manufacturer with identical electrical specifications, operating temperature range, and 16-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance.

Q: What is the difference between the CD74HCT238M and 74HCT238D,653?

A: Both parts implement the same 1 x 3:8 decoder/demultiplexer function with matching output current ratings and supply voltage. The primary differences are manufacturer (Texas Instruments versus Nexperia USA Inc.), operating temperature range (CD74HCT238M: -55°C ~ 125°C; 74HCT238D,653: -40°C ~ 125°C), and product status (obsolete versus active). The 74HCT238D,653 is suitable for applications operating above -40°C.

Q: Is the MC74HCT138ADG compatible with CD74HCT238M?

A: MC74HCT138ADG is a parametric equivalent offering identical electrical performance and temperature range. However, the base product number differs (74HCT138 versus 74HCT238). Both implement 1 x 3:8 decoder/demultiplexer topology with 4mA output current and 4.5V ~ 5.5V supply voltage. Pinout compatibility must be verified for specific applications.

Q: Why does 74HCT238D-Q100J have a narrower operating temperature range?

A: The 74HCT238D-Q100J is qualified to AEC-Q100 automotive standards with an operating range of -40°C ~ 125°C. This range is standard for automotive-grade components. The narrower low-temperature limit does not affect performance in applications operating above -40°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (CD74HCT238M96, 74HCT238D,653, 74HCT238D-Q100J, and MC74HCT138ADG) are ROHS3 compliant with MSL Level 1 moisture sensitivity rating, matching the compliance profile of the CD74HCT238M.

Q: What packaging formats are available for the 74HCT238 decoder/demultiplexer?

A: The substitute parts are available in multiple packaging formats: Tube (CD74HCT238M, MC74HCT138ADG), Cut Tape & Digi-Reel (CD74HCT238M96), and Tape & Reel (74HCT238D,653 and 74HCT238D-Q100J). Selection depends on procurement requirements and assembly processes.

Q: Can the 74HCT238D-Q100J be used in non-automotive applications?

A: Yes. The 74HCT238D-Q100J meets automotive qualification standards but is functionally suitable for any application requiring a 1 x 3:8 decoder/demultiplexer with 4.5V ~ 5.5V supply and -40°C ~ 125°C operating range. Automotive qualification does not restrict use in other applications.