CD74HC4538ME4 Equivalent & Substitute Parts

Part Overview

The CD74HC4538ME4 is a monostable multivibrator logic IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This device features dual independent circuits with Schmitt trigger inputs and a propagation delay of 21 ns. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and procurement planning. Alternative models from Texas Instruments, Nexperia, and onsemi provide functional equivalence with variations in propagation delay, Schmitt trigger capability, and product lifecycle status.

Substiute Parts

CD74HC4538ME4

Texas InstrumentsIn Stock: 704CD74HC4538ME4 Datasheet

Current PartRFQ

CD74HC4538M

Texas InstrumentsIn Stock: 1791CD74HC4538M Datasheet

MFR RecommendedRFQ

CD74HC4538M96

Texas InstrumentsIn Stock: 18296CD74HC4538M96 Datasheet

MFR RecommendedRFQ

74HC4538D,653

Nexperia USA Inc.In Stock: 230374HC4538D,653 Datasheet

MFR RecommendedRFQ

74HC4538D-Q100,118

Nexperia USA Inc.In Stock: 349774HC4538D-Q100,118 Datasheet

MFR RecommendedRFQ

MC74HC4538ADG

onsemiIn Stock: 1226MC74HC4538ADG Datasheet

MFR RecommendedRFQ

MC74HC4538ADR2G

onsemiIn Stock: 15678MC74HC4538ADR2G Datasheet

MFR RecommendedRFQ

NLV74HC4538ADR2G

onsemiIn Stock: 3807NLV74HC4538ADR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC4538ME4 is determined by the following critical parameters:

• Base Product Number: All substitutes must share the 74HC4538 base designation, ensuring functional equivalence as dual monostable multivibrators
• Package / Case: All substitutes must use 16-SOIC or equivalent 16-SO surface mount packaging to ensure PCB compatibility
• Voltage Supply Range: All substitutes must support 2 V to 6 V operation
• Output Current: All substitutes must provide 5.2 mA output capability (High and Low)
• Independent Circuits: All substitutes must feature 2 independent circuits
• Compliance: All substitutes must maintain ROHS3 compliance and MSL 1 rating

Variations in propagation delay (21 ns to 30 ns), Schmitt trigger input availability, operating temperature range (-40°C to -55°C minimum), and product status (Active, Last Time Buy, Obsolete) do not disqualify substitution but must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): CD74HC4538M96 from Texas Instruments is the recommended primary substitute. It maintains identical electrical specifications (21 ns propagation delay, Schmitt trigger input, -55°C to 125°C operating range) and is in Active product status with substantial inventory availability. The Cut Tape & Digi-Reel packaging provides flexibility for both prototype and production volumes.

Secondary Substitutes (Texas Instruments): CD74HC4538M offers identical electrical performance to the main part but shares Last Time Buy status. Selection should prioritize CD74HC4538M96 for long-term availability.

Alternative Substitutes (Nexperia): The 74HC4538D,653 and 74HC4538D-Q100,118 from Nexperia are functionally equivalent but feature 25 ns propagation delay (4 ns slower than the main part) and lack Schmitt trigger inputs. These parts are suitable for applications where input noise immunity is not critical and timing margins accommodate the increased delay. The 74HC4538D-Q100,118 variant includes AEC-Q100 automotive qualification.

Alternative Substitutes (onsemi): MC74HC4538ADR2G from onsemi provides 30 ns propagation delay with Schmitt trigger input and is in Active status. The NLV74HC4538ADR2G variant includes AEC-Q100 automotive qualification but is Obsolete. MC74HC4538ADG is also Obsolete and should be avoided for new designs.

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

Frequently Asked Questions (FAQ)

Q: Can I substitute CD74HC4538ME4 with 74HC4538D,653 from Nexperia?

A: Yes, functionally. Both are dual monostable multivibrators in 16-SOIC packages with identical voltage supply ranges and output current ratings. However, the Nexperia part has 25 ns propagation delay versus 21 ns for the main part, and it lacks Schmitt trigger inputs. Verify that your application timing margins accommodate the 4 ns delay increase and that input noise immunity is not required.

Q: What is the difference between CD74HC4538M and CD74HC4538M96?

A: Both are Texas Instruments parts with identical electrical specifications (21 ns propagation delay, Schmitt trigger input, -55°C to 125°C). The primary difference is packaging: CD74HC4538M is supplied in Tube format, while CD74HC4538M96 is supplied in Cut Tape & Digi-Reel format. CD74HC4538M96 is in Active status with higher inventory, making it the preferred choice for new designs.

Q: Why do some substitutes have different propagation delays?

A: Propagation delay variations (21 ns, 25 ns, 30 ns) reflect manufacturing process differences between Texas Instruments, Nexperia, and onsemi. All delays fall within acceptable ranges for the 74HC4538 logic family. Verify that your circuit timing margins accommodate the maximum specified delay for your selected substitute.

Q: Are automotive-qualified versions available?

A: Yes. The 74HC4538D-Q100,118 from Nexperia and NLV74HC4538ADR2G from onsemi both include AEC-Q100 automotive qualification. The 74HC4538D-Q100,118 is in Active status and recommended for automotive applications.

Q: What does "Last Time Buy" status mean for the main part?

A: Last Time Buy indicates that CD74HC4538ME4 production is ending and no further orders will be accepted after a specified date. Substitution to an Active status part (such as CD74HC4538M96) is necessary for long-term supply continuity.

Q: Can I use MC74HC4538ADR2G as a direct replacement?

A: Yes, with timing considerations. MC74HC4538ADR2G is functionally equivalent with 30 ns propagation delay (9 ns slower than the main part) and maintains Schmitt trigger input capability. It is in Active status from onsemi. Confirm that your application timing margins accommodate the increased delay.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly and storage requirements.