CD4538BCMX Equivalent & Substitute Parts

Part Overview

The CD4538BCMX is a monostable multivibrator logic IC manufactured by onsemi, housed in a 16-SOIC package with 100 ns propagation delay. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The CD4538BCMX belongs to the 4000B logic series and operates across a supply voltage range of 3 V to 15 V with dual independent circuits.

Substiute Parts

CD4538BCMX

onsemiIn Stock: 2225CD4538BCMX Datasheet

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MC14538BDG

onsemiIn Stock: 3632MC14538BDG Datasheet

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MC14538BDR2G

onsemiIn Stock: 15412MC14538BDR2G Datasheet

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NLV14538BDR2G

onsemiIn Stock: 10471NLV14538BDR2G Datasheet

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CD14538BM

Texas InstrumentsIn Stock: 3341CD14538BM Datasheet

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CD14538BM96

Texas InstrumentsIn Stock: 105210CD14538BM96 Datasheet

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CD14538BMT

Texas InstrumentsIn Stock: 133872CD14538BMT Datasheet

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CD14538BNSR

Texas InstrumentsIn Stock: 1693CD14538BNSR Datasheet

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HEF4538BT,653

Nexperia USA Inc.In Stock: 29109HEF4538BT,653 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD4538BCMX is determined by the following critical parameters:

• Logic Type: Monostable multivibrator configuration
• Independent Circuits: Dual circuit requirement (2 circuits)
• Package / Case: 16-SOIC form factor with 0.154" width (3.90mm)
• Mounting Type: Surface mount compatibility
• Voltage - Supply: Minimum 3 V to 15 V operating range
• Operating Temperature: -55°C to 125°C range
• Series Compatibility: 4000B logic family

Substitute parts are grouped into two categories based on electrical performance and product status:

Category 1 - Direct Electrical Equivalents (100 ns Propagation Delay): CD14538BM, CD14538BM96, CD14538BMT, and CD14538BNSR maintain the same 100 ns propagation delay and output current specifications as the CD4538BCMX, ensuring functional equivalence in timing-critical applications.

Category 2 - Enhanced Performance Alternatives (95 ns Propagation Delay): MC14538BDG and MC14538BDR2G offer improved propagation delay of 95 ns with extended supply voltage range (3 V ~ 18 V) and Schmitt trigger input capability, suitable for applications where faster response times are beneficial.

Category 3 - Specialized Grade: NLV14538BDR2G provides automotive-grade qualification (AEC-Q100) with 95 ns propagation delay for automotive and high-reliability applications.

Category 4 - Performance-Optimized Alternative: HEF4538BT,653 delivers significantly faster 40 ns propagation delay with reduced output current (3.4 mA), though with narrower supply voltage range (3 V ~ 15 V) and different temperature operating floor (-40°C minimum).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Identical Timing Characteristics:

CD14538BM96 (Texas Instruments, Active status) is the primary recommended substitute. It maintains 100 ns propagation delay matching the CD4538BCMX, operates across 3 V to 18 V supply range, and is currently in active production with high inventory availability (105,100 pcs). The extended supply voltage range provides design flexibility without compromising timing performance.

For Enhanced Performance with Active Product Status:

MC14538BDR2G (onsemi, Active status) offers 95 ns propagation delay with extended supply voltage (3 V ~ 18 V) and Schmitt trigger input capability. This part maintains the same output current as the CD4538BCMX and operates across the full temperature range. High inventory (15,306 pcs) ensures supply continuity.

For Automotive and High-Reliability Applications:

NLV14538BDR2G (onsemi, Active status) provides AEC-Q100 automotive qualification with 95 ns propagation delay and extended supply voltage range. This part is suitable for automotive-grade designs requiring formal qualification documentation.

For Performance-Optimized Designs:

HEF4538BT,653 (Nexperia USA Inc., Active status) delivers significantly faster 40 ns propagation delay with reduced output current (3.4 mA). This part is appropriate for applications where faster response times are required and lower power consumption is beneficial. Note the narrower supply voltage range (3 V ~ 15 V) and minimum operating temperature of -40°C.

All recommended substitutes are RoHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use MC14538BDR2G as a direct replacement for CD4538BCMX?

A: Yes. MC14538BDR2G is functionally compatible as a substitute. Both are monostable multivibrators with dual independent circuits in 16-SOIC packages. The 95 ns propagation delay of MC14538BDR2G is faster than the CD4538BCMX's 100 ns, which is acceptable in most applications. The extended supply voltage range (3 V ~ 18 V) provides additional design margin.

Q: What is the difference between CD14538BM96 and CD14538BMT?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications: 100 ns propagation delay, 6.8 mA output current, and 3 V ~ 18 V supply range. The primary difference is packaging: CD14538BM96 is supplied in Cut Tape (CT) & Digi-Reel format, while CD14538BMT is also in Cut Tape format. CD14538BM96 has significantly higher inventory availability (105,100 pcs vs. 133,853 pcs for CD14538BMT).

Q: Why does CD14538BNSR have a different package width than other substitutes?

A: CD14538BNSR uses a 16-SO package with 0.209" width (5.30mm), compared to the standard 16-SOIC with 0.154" width (3.90mm) used by other substitutes. This wider package may require PCB layout modifications. For designs requiring the standard 0.154" width, use CD14538BM96, CD14538BMT, or MC14538BDR2G instead.

Q: Is HEF4538BT,653 suitable for all applications using CD4538BCMX?

A: HEF4538BT,653 is suitable only for applications where faster propagation delay (40 ns vs. 100 ns) is acceptable or beneficial. The reduced output current (3.4 mA vs. 8.8 mA) may affect fan-out capability in high-load applications. The narrower supply voltage range (3 V ~ 15 V) and lower minimum operating temperature (-40°C vs. -55°C) must be verified against design requirements.

Q: What is the advantage of NLV14538BDR2G over standard alternatives?

A: NLV14538BDR2G carries AEC-Q100 automotive qualification, making it suitable for automotive and high-reliability applications requiring formal qualification documentation. It maintains the same electrical performance as MC14538BDR2G (95 ns propagation delay, 3 V ~ 18 V supply) while meeting automotive industry standards.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.