CD74HCT4538M Equivalent & Substitute Parts

Part Overview

The CD74HCT4538M is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component features dual independent circuits with Schmitt trigger inputs and a 23 ns propagation delay. The part is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning. Substitute parts are available from both Texas Instruments and Nexperia USA Inc., with variations in packaging, propagation delay, and product status.

Substiute Parts

CD74HCT4538M

Texas InstrumentsIn Stock: 1201CD74HCT4538M Datasheet

Current PartRFQ

CD74HCT4538M96

Texas InstrumentsIn Stock: 4795CD74HCT4538M96 Datasheet

MFR RecommendedRFQ

74HCT4538D,118

Nexperia USA Inc.In Stock: 665174HCT4538D,118 Datasheet

MFR RecommendedRFQ

74HCT4538D-Q100,11

Nexperia USA Inc.In Stock: 92474HCT4538D-Q100,11 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT4538M is determined by the following critical parameters: base product number (74HCT4538), logic type (monostable multivibrator), independent circuits (2), output current specifications (4 mA / 4 mA), supply voltage range (4.5 V to 5.5 V), package type (16-SOIC), and mounting type (surface mount). All identified substitutes maintain these core electrical and mechanical specifications.

Variations among substitutes include propagation delay (23 ns vs. 35 ns), Schmitt trigger input availability (present in CD74HCT4538M96, absent in Nexperia variants), operating temperature range (-55°C to 125°C vs. -40°C to 125°C), packaging format (tube, cut tape, or tape & reel), and product status (active vs. last time buy). The automotive-qualified variant (74HCT4538D-Q100,11) includes AEC-Q100 certification for applications requiring automotive-grade components.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT4538M96 is the primary substitute for the CD74HCT4538M, maintaining identical electrical specifications including 23 ns propagation delay and Schmitt trigger input functionality. Both parts are manufactured by Texas Instruments and carry active product status, with CD74HCT4538M96 available in higher inventory quantities. The primary distinction is packaging format: CD74HCT4538M is supplied in tube packaging, while CD74HCT4538M96 is available in cut tape and Digi-Reel formats.

For applications where propagation delay tolerance permits 35 ns operation, the Nexperia variants 74HCT4538D,118 and 74HCT4538D-Q100,11 are functionally equivalent substitutes. Both maintain the same supply voltage range, output current specifications, and 16-SOIC package footprint. The absence of Schmitt trigger input in Nexperia parts requires circuit-level evaluation for applications dependent on this feature.

The 74HCT4538D-Q100,11 variant includes AEC-Q100 automotive qualification and is appropriate for automotive applications requiring grade-specific certification. This part operates over a reduced temperature range (-40°C to 125°C) compared to the original CD74HCT4538M (-55°C to 125°C).

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT4538M96 be used as a direct replacement for CD74HCT4538M?

A: Yes. CD74HCT4538M96 is electrically and functionally identical to CD74HCT4538M, with matching propagation delay (23 ns), Schmitt trigger input, and operating specifications. The difference is packaging format: tube versus cut tape/Digi-Reel. Both are Texas Instruments products with identical electrical performance.

Q: What is the impact of using a 35 ns propagation delay part instead of 23 ns?

A: The Nexperia variants (74HCT4538D,118 and 74HCT4538D-Q100,11) have 35 ns propagation delay compared to 23 ns in the original part. This 12 ns difference affects timing-critical applications. Circuit-level timing analysis is required to determine if this delay increase is acceptable for your specific application.

Q: Are the Nexperia parts compatible with the original CD74HCT4538M?

A: Nexperia parts are pin-compatible and functionally equivalent for monostable multivibrator operation. However, they lack Schmitt trigger input and have longer propagation delay. Compatibility depends on whether your circuit requires Schmitt trigger functionality and can tolerate the increased delay.

Q: What is the difference between 74HCT4538D,118 and 74HCT4538D-Q100,11?

A: Both parts are electrically identical with 35 ns propagation delay and no Schmitt trigger input. The 74HCT4538D-Q100,11 includes AEC-Q100 automotive qualification and operates over -40°C to 125°C. Select the automotive variant only if AEC-Q100 certification is required.

Q: Why does CD74HCT4538M have Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number. CD74HCT4538M96 (active status) is the recommended long-term replacement from Texas Instruments for new designs and ongoing procurement.

Q: Are all substitutes available in the same package?

A: All substitutes use the 16-SOIC package with identical footprint (0.154", 3.90 mm width). Packaging format differs: CD74HCT4538M is tube, CD74HCT4538M96 is cut tape/Digi-Reel, and Nexperia parts are tape & reel. These format differences do not affect PCB assembly compatibility.

Q: Do all parts meet the same compliance standards?

A: All parts are ROHS3 compliant with MSL 1 rating. The 74HCT4538D-Q100,11 additionally carries AEC-Q100 automotive qualification. REACH status is unaffected for all variants.